/* ===== 00-core.css ===== */
/* =====================================================================
   HAZMAT READY — Design system 2026
   Part 1/5 · Foundation · Header · Footer · Primitives
   ===================================================================== */

/* ---------- Tokens ---------- */
:root{
  --ink-950:#050E0A;
  --ink-900:#07150F;
  --ink-850:#0A1D15;
  --ink-800:#0D251A;
  --ink-700:#123425;
  --forest-600:#1A4B36;
  --forest-500:#215F45;
  --jade:#2C7E5D;
  --jade-soft:#4E9B78;
  --moss:#8CA68A;
  --lime:#CDF27F;
  --lime-bright:#DEFF9B;
  --lime-deep:#B4E45C;
  --lime-soft:#EFFBD6;
  --amber:#E3B06A;
  --paper:#F5F3EB;
  --paper-2:#EDEAE0;
  --surface:#FFFFFF;
  --text:#13221B;
  --muted:#5F6D63;
  --muted-2:#7C897F;
  --line:#E4E0D3;
  --line-strong:#D2CDBD;
  --ok:#1F7A57;
  --ok-bg:#EDF8F1;
  --bad:#B34A33;
  --bad-bg:#FCF0EB;
  --radius-xs:8px;
  --radius-sm:12px;
  --radius:18px;
  --radius-lg:24px;
  --radius-xl:32px;
  --radius-pill:999px;
  --font-display:"Instrument Serif","Iowan Old Style","Palatino Linotype",Georgia,serif;
  --font-sans:"Manrope","Segoe UI",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"Cascadia Mono",Consolas,monospace;
  --shadow-sm:0 1px 2px rgba(14,33,24,.05),0 8px 24px -18px rgba(14,33,24,.25);
  --shadow-md:0 2px 4px rgba(14,33,24,.04),0 24px 48px -32px rgba(14,33,24,.35);
  --shadow-lg:0 40px 90px -50px rgba(8,25,17,.55);
  --ease:cubic-bezier(.22,1,.36,1);
  --ease-soft:cubic-bezier(.4,0,.2,1);
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)' opacity='.6'/%3E%3C/svg%3E");
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:15.5px;
  line-height:1.7;
  font-weight:450;
  color:var(--text);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
  overflow-x:clip;
}
body::after{
  content:"";position:fixed;inset:0;z-index:999;pointer-events:none;
  background-image:var(--grain);background-size:220px 220px;
  opacity:.045;mix-blend-mode:soft-light;
}
img,svg{max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--jade);text-underline-offset:4px}
button,a,input,select,summary,textarea{-webkit-tap-highlight-color:transparent;touch-action:manipulation}
[hidden]{display:none!important}
::selection{background:var(--lime);color:var(--ink-900)}
::-moz-selection{background:var(--lime);color:var(--ink-900)}
*{scrollbar-width:thin;scrollbar-color:#B9C4B4 transparent}
:focus-visible{outline:2px solid var(--jade);outline-offset:3px;border-radius:4px}
.home-hero :focus-visible,.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--lime)}

/* ---------- Typography ---------- */
h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-display);
  font-weight:400;
  line-height:1.02;
  letter-spacing:-.018em;
  color:var(--ink-900);
  text-wrap:balance;
}
h1{font-size:clamp(2.9rem,5.4vw,5.15rem);line-height:.97;letter-spacing:-.026em}
h2{font-size:clamp(2.15rem,3.5vw,3.5rem);line-height:1.02}
h3{font-size:clamp(1.4rem,1.7vw,1.8rem);line-height:1.12;letter-spacing:-.012em}
h4{font-size:1.2rem;line-height:1.2;letter-spacing:-.01em}
p{margin:0;text-wrap:pretty}
em{font-style:italic}
strong{font-weight:700}
code,kbd,samp{font-family:var(--font-mono)}
.small{font-size:12.5px;color:var(--muted);line-height:1.75}
.lede{
  max-width:640px;margin:0;
  font-family:var(--font-sans);font-size:clamp(1.02rem,.4vw + .92rem,1.16rem);
  line-height:1.72;color:var(--muted);font-weight:400;
}
.mono{font-family:var(--font-mono);letter-spacing:.02em}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  margin:0 0 22px;
  font-family:var(--font-mono);font-size:10px;font-weight:500;
  letter-spacing:.24em;text-transform:uppercase;line-height:1.4;
  color:#256C4E;
}
.eyebrow::before{
  content:"";width:6px;height:6px;flex:none;
  background:currentColor;transform:rotate(45deg);
  box-shadow:0 0 0 3px rgba(44,126,93,.14);
}
.home-hero .eyebrow{color:var(--lime)}
.home-hero .eyebrow::before{box-shadow:0 0 0 3px rgba(205,242,127,.16),0 0 18px rgba(205,242,127,.5)}

/* ---------- Layout ---------- */
.wrap{width:min(1240px,100% - 96px);margin-inline:auto;padding:0}
.home-section{position:relative;padding:clamp(72px,8.5vw,124px) 0}
.section-head{
  display:flex;justify-content:space-between;align-items:flex-end;
  gap:48px;margin-bottom:clamp(36px,4vw,58px);
}
.section-head > div{max-width:660px}
.section-head .eyebrow{margin-bottom:16px}
.section-head h2 + p{margin-top:18px}
.section-head p{max-width:360px;font-size:14px;line-height:1.8;color:var(--muted);text-align:right}
.section-head > p{margin-bottom:4px}
.text-link{
  display:inline-flex;align-items:center;gap:16px;
  font-size:12.5px;font-weight:650;letter-spacing:.01em;
  color:var(--ink-900);text-decoration:none;
}
.text-link span{transition:transform .35s var(--ease)}
.text-link:hover span{transform:translate(3px,-3px)}
.text-link::after{content:"";display:block;width:34px;height:1px;background:var(--line-strong);transition:width .35s var(--ease),background .3s}
.text-link:hover::after{width:52px;background:var(--jade)}

/* ---------- Buttons ---------- */
.btn{
  position:relative;display:inline-flex;align-items:center;justify-content:center;gap:14px;
  min-height:52px;padding:0 26px;border-radius:var(--radius-pill);
  border:1px solid transparent;background:var(--ink-900);color:#fff;
  font-family:var(--font-sans);font-size:13px;font-weight:650;letter-spacing:-.005em;
  line-height:1.2;text-decoration:none;white-space:nowrap;
  transition:transform .35s var(--ease),background .3s,color .3s,border-color .3s,box-shadow .35s var(--ease);
}
.btn [aria-hidden="true"]{transition:transform .35s var(--ease)}
.btn:hover{transform:translateY(-2px)}
.btn:hover [aria-hidden="true"]{transform:translate(2px,-2px)}
.btn:active{transform:translateY(0)}
.btn:disabled,.btn[disabled]{opacity:.38;cursor:not-allowed;transform:none;box-shadow:none}
.btn-accent{
  background:linear-gradient(180deg,#DBFA9F 0%,var(--lime) 52%,#BFEC69 100%);
  color:#0A1B12;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.65),0 14px 34px -18px rgba(175,227,88,.85),0 2px 6px rgba(12,32,22,.12);
}
.btn-accent:hover{background:linear-gradient(180deg,#EAFFB8,var(--lime-bright) 55%,#CBF37A);box-shadow:inset 0 1px 0 rgba(255,255,255,.7),0 18px 42px -18px rgba(186,235,100,.95),0 3px 8px rgba(12,32,22,.14)}
.btn-ghost{background:transparent;border-color:var(--line-strong);color:var(--ink-900);box-shadow:none}
.btn-ghost:hover{background:rgba(255,255,255,.7);border-color:var(--ink-700);color:var(--ink-900)}
.btn-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin:0}

/* dark-context ghost buttons */
.home-hero .btn-ghost,.site-footer .btn-ghost,.cta-banner .btn-ghost,.guestbook-compose .btn-ghost{
  border-color:rgba(255,255,255,.22);color:#EFF5EA;background:rgba(255,255,255,.03);backdrop-filter:blur(8px);
}
.home-hero .btn-ghost:hover,.site-footer .btn-ghost:hover,.guestbook-compose .btn-ghost:hover{background:rgba(255,255,255,.09);border-color:rgba(205,242,127,.55);color:#fff}

/* ---------- Skip link & scroll progress ---------- */
.skip-link{
  position:fixed;left:24px;top:-90px;z-index:200;
  padding:13px 22px;border-radius:12px;background:var(--lime);color:#0A1B12;
  font-size:12px;font-weight:700;text-decoration:none;box-shadow:var(--shadow-md);
  transition:top .3s var(--ease);
}
.skip-link:focus{top:16px}
.scroll-progress{
  position:fixed;inset:0 0 auto;height:2px;z-index:150;background:rgba(205,242,127,.08);pointer-events:none;
}
.scroll-progress span{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,#8FD672,var(--lime),#F3FFC4);
  box-shadow:0 0 14px rgba(205,242,127,.6);
  transition:width .1s linear;
}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:120;
  color:#fff;
  background:linear-gradient(180deg,rgba(7,21,15,.97),rgba(5,16,11,.92));
  border-bottom:1px solid rgba(255,255,255,.08);
  backdrop-filter:blur(22px) saturate(160%);
  -webkit-backdrop-filter:blur(22px) saturate(160%);
  transition:background .35s var(--ease),box-shadow .35s var(--ease),border-color .35s;
}
.site-header::before{
  content:"";position:absolute;inset:0 0 auto;height:1px;
  background:linear-gradient(90deg,transparent 4%,rgba(205,242,127,.45) 38%,rgba(255,255,255,.28) 62%,transparent 96%);
  opacity:.7;
}
.site-header.scrolled{background:rgba(4,13,9,.98);box-shadow:0 26px 60px -44px #000;border-color:rgba(255,255,255,.06)}
.site-header .wrap{
  height:86px;display:flex;align-items:center;gap:26px;
  transition:height .35s var(--ease);
}
.site-header.scrolled .wrap{height:70px}

.brand{
  display:inline-flex;align-items:center;gap:13px;flex:none;
  color:#F5F8EF;text-decoration:none;
  font-size:16.5px;font-weight:650;letter-spacing:-.022em;white-space:nowrap;
}
.brand-mark{
  position:relative;display:grid;place-items:center;
  width:34px;height:34px;flex:none;border-radius:9px;
  transform:rotate(45deg);
  background:linear-gradient(140deg,#F0FFC8 0%,#D5F99A 38%,#A9D96F 100%);
  box-shadow:0 0 0 1px rgba(233,255,190,.5),0 10px 26px -10px rgba(180,235,110,.7),inset 0 1px 0 rgba(255,255,255,.85);
  transition:transform .5s var(--ease),box-shadow .4s;
}
.brand-mark::after{
  content:"";position:absolute;inset:3px;border-radius:6px;border:1px solid rgba(13,37,26,.16);
}
.brand-mark span{
  transform:rotate(-45deg);display:block;position:relative;z-index:1;
  font-family:var(--font-display);font-size:21px;line-height:1;color:#0A1B12;
  padding-bottom:2px;
}
.brand em{
  font-family:var(--font-display);font-style:italic;font-weight:400;
  font-size:19px;letter-spacing:-.01em;color:var(--lime);
}
.brand:hover .brand-mark{transform:rotate(135deg);box-shadow:0 0 0 1px rgba(233,255,190,.7),0 14px 30px -10px rgba(180,235,110,.85),inset 0 1px 0 rgba(255,255,255,.9)}

.main-nav{display:flex;align-items:center;gap:1px;margin-left:auto}
.main-nav a{
  position:relative;display:inline-flex;align-items:center;height:38px;
  padding:0 14px;border-radius:var(--radius-pill);
  color:rgba(238,245,234,.62);text-decoration:none;
  font-size:12.5px;font-weight:550;letter-spacing:-.005em;
  transition:color .25s,background .25s;
}
.main-nav a::after{
  content:"";position:absolute;left:50%;bottom:5px;width:0;height:2px;border-radius:2px;
  background:var(--lime);transform:translateX(-50%);
  transition:width .3s var(--ease);opacity:.9;
}
.main-nav a:hover{color:#fff;background:rgba(255,255,255,.055)}
.main-nav a:hover::after{width:12px}
.main-nav a[aria-current=page]{color:#fff;background:rgba(255,255,255,.06)}
.main-nav a[aria-current=page]::after{width:14px}
.main-nav .nav-es{
  margin-left:8px;padding:0 11px;height:30px;
  border:1px solid rgba(255,255,255,.18);border-radius:7px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;color:rgba(238,245,234,.72);
}
.main-nav .nav-es::after{display:none}
.main-nav .nav-es:hover{border-color:rgba(205,242,127,.6);color:var(--lime);background:transparent}

.nav-start{
  position:relative;display:inline-flex;align-items:center;gap:9px;flex:none;
  height:42px;padding:0 19px;margin-left:12px;border-radius:var(--radius-pill);
  background:linear-gradient(180deg,#DAF99E,var(--lime) 55%,#C2EE6C);
  color:#0A1B12 !important;text-decoration:none;
  font-size:12.5px;font-weight:700;letter-spacing:-.005em;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.6),0 10px 26px -14px rgba(180,235,105,.9);
  transition:transform .35s var(--ease),box-shadow .35s,background .3s;
}
.nav-start:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 rgba(255,255,255,.7),0 16px 32px -14px rgba(190,240,110,1)}
.nav-start span{transition:transform .35s var(--ease)}
.nav-start:hover span{transform:translate(2px,-2px)}
.menu-toggle{
  display:none;flex:none;
  width:42px;height:42px;margin-left:auto;padding:0;
  border:1px solid rgba(255,255,255,.18);border-radius:11px;
  background:rgba(255,255,255,.04);color:#fff;
  font-size:15px;line-height:1;
  transition:border-color .25s,background .25s;
}
.menu-toggle:hover{border-color:rgba(205,242,127,.5);background:rgba(255,255,255,.08)}

/* ---------- Footer ---------- */
.site-footer{
  position:relative;overflow:hidden;
  padding:clamp(64px,7vw,96px) 0 30px;
  background:var(--ink-950);
  border-top:1px solid rgba(255,255,255,.07);
  color:rgba(232,240,229,.6);
  font-size:13px;
}
.site-footer::before{
  content:"";position:absolute;pointer-events:none;
  width:900px;height:420px;left:50%;top:-260px;transform:translateX(-50%);
  background:radial-gradient(ellipse at center,rgba(74,160,120,.22),rgba(74,160,120,0) 68%);
  filter:blur(10px);
}
.site-footer::after{
  content:"HAZMAT READY";position:absolute;right:-2%;bottom:-4%;
  font-family:var(--font-display);font-size:clamp(70px,12vw,180px);line-height:.8;
  letter-spacing:-.03em;color:rgba(205,242,127,.045);
  pointer-events:none;white-space:nowrap;
}
.site-footer .wrap{position:relative;z-index:1}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:56px}
.footer-brand .brand{margin-bottom:22px}
.footer-brand p{max-width:330px;font-size:12.5px;line-height:1.85;color:rgba(232,240,229,.52);margin:0}
.footer-links{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.footer-links strong{
  margin-bottom:8px;
  font-family:var(--font-mono);font-size:9.5px;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;color:rgba(205,242,127,.78);
}
.footer-links a{
  color:rgba(232,240,229,.62);text-decoration:none;font-size:12.5px;
  transition:color .2s,transform .3s var(--ease);
}
.footer-links a:hover{color:#fff;transform:translateX(3px)}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:flex-end;gap:32px;
  margin-top:56px;padding-top:24px;border-top:1px solid rgba(255,255,255,.08);
}
.footer-bottom p{max-width:660px;font-size:10.5px;line-height:1.8;color:rgba(232,240,229,.5);margin:0}
.footer-bottom > div{display:flex;gap:20px;flex:none}
.footer-bottom a{font-family:var(--font-mono);font-size:10px;letter-spacing:.08em;color:rgba(232,240,229,.56);text-decoration:none;text-transform:uppercase}
.footer-bottom a:hover{color:var(--lime)}

/* ---------- Reveal & motion ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.visible{opacity:1;transform:none}
@keyframes card-in{from{opacity:0;transform:translateY(10px) scale(.99)}to{opacity:1;transform:none}}

/* ===== 10-home.css ===== */
/* =====================================================================
   Part 2/5 · Home experience · Hero, modes, syllabus, states, CTAs
   ===================================================================== */

/* ---------- Hero shell ---------- */
.home-hero{
  position:relative;isolation:isolate;overflow:hidden;
  background:var(--ink-950);color:#EDF4E8;
}
.hero-bg{position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none}
.hero-bg::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(120% 90% at 78% 6%,#153A2A 0%,rgba(21,58,42,0) 58%),
    radial-gradient(90% 80% at 6% 92%,#0E2B1F 0%,rgba(14,43,31,0) 62%),
    linear-gradient(168deg,#081A12 0%,#050F0B 60%,#040C08 100%);
}
.hero-glow{position:absolute;border-radius:50%;filter:blur(70px);opacity:.55}
.glow-a{width:620px;height:620px;right:-140px;top:-180px;background:radial-gradient(circle,rgba(120,205,130,.35),rgba(120,205,130,0) 66%)}
.glow-b{width:520px;height:520px;left:-200px;bottom:-240px;background:radial-gradient(circle,rgba(205,242,127,.16),rgba(205,242,127,0) 65%)}
.hero-mesh{
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(205,242,127,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(205,242,127,.05) 1px,transparent 1px);
  background-size:88px 88px;
  -webkit-mask-image:radial-gradient(90% 75% at 68% 22%,#000 0%,transparent 72%);
  mask-image:radial-gradient(90% 75% at 68% 22%,#000 0%,transparent 72%);
  opacity:.55;
}
.hero-rings{position:absolute;right:-160px;top:50%;transform:translateY(-50%);width:840px;height:840px;opacity:.5}
.hero-rings span{
  position:absolute;inset:0;border-radius:50%;
  border:1px solid rgba(205,242,127,.11);
}
.hero-rings span:nth-child(2){inset:110px;border-color:rgba(205,242,127,.09)}
.hero-rings span:nth-child(3){inset:230px;border-color:rgba(205,242,127,.07)}
.hero-rings span:nth-child(4){inset:350px;border-color:rgba(205,242,127,.2);background:radial-gradient(circle,rgba(205,242,127,.07),transparent 70%)}
.hero-route{position:absolute;left:0;bottom:-1px;width:100%;height:340px;opacity:.5}
.hero-route path{fill:none;stroke:rgba(205,242,127,.28);stroke-width:1;stroke-dasharray:2 14;animation:route 26s linear infinite}
@keyframes route{to{stroke-dashoffset:-320}}
.hero-route path.solid{stroke:rgba(205,242,127,.09);stroke-dasharray:none}

.home-hero .wrap{position:relative;z-index:2}
.hero-grid{
  display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,.98fr);
  align-items:center;gap:clamp(30px,4.5vw,76px);
  padding:clamp(58px,6.4vw,96px) 0 clamp(42px,5vw,66px);
}
.hero-copy{min-width:0}
.hero-copy .eyebrow{color:var(--lime)}
.hero-copy h1{
  color:#F4F8EE;
  font-size:clamp(3.35rem,5.7vw,5.7rem);
  line-height:.93;letter-spacing:-.032em;
  max-width:640px;
}
.hero-copy h1 em{
  color:var(--lime);font-style:italic;
  text-shadow:0 0 42px rgba(205,242,127,.28);
}
.hero-lede{
  max-width:436px;margin:28px 0 0;
  font-size:15px;line-height:1.85;color:rgba(232,241,228,.62);font-weight:400;
}
.hero-copy .btn-row{margin-top:34px}
.hero-note{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:26px;
}
.hero-note span{
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 12px;border-radius:999px;
  border:1px solid rgba(255,255,255,.11);background:rgba(255,255,255,.025);
  font-family:var(--font-mono);font-size:9px;letter-spacing:.1em;text-transform:uppercase;
  color:rgba(232,241,228,.55);line-height:1.4;
}
.hero-note span::before{content:"";width:4px;height:4px;border-radius:50%;background:var(--lime);opacity:.8;flex:none}

/* ---------- Hero preview stage ---------- */
.study-stage{
  position:relative;min-width:0;perspective:1500px;
  padding:26px 18px 34px 12px;
}
.stage-rings{position:absolute;inset:-8% -12% -12% 2%;pointer-events:none;z-index:0}
.stage-rings span{position:absolute;inset:0;border-radius:50%;border:1px solid rgba(205,242,127,.07)}
.stage-rings span:nth-child(2){inset:9%}
.stage-rings span:nth-child(3){inset:18%;border-color:rgba(205,242,127,.05)}

.study-preview{
  --rx:0deg;--ry:0deg;
  position:relative;z-index:2;
  padding:24px 26px 22px;
  border-radius:22px;
  background:linear-gradient(158deg,rgba(43,76,58,.82),rgba(9,26,18,.95) 72%);
  border:1px solid rgba(205,242,127,.17);
  box-shadow:
    0 60px 110px -45px rgba(0,0,0,.9),
    0 0 0 1px rgba(255,255,255,.03),
    inset 0 1px 0 rgba(255,255,255,.14);
  backdrop-filter:blur(26px) saturate(130%);
  -webkit-backdrop-filter:blur(26px) saturate(130%);
  transform:rotateX(var(--ry)) rotateY(var(--rx));
  transform-style:preserve-3d;
  transition:transform .5s var(--ease),box-shadow .5s;
}
.study-preview::before{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:linear-gradient(115deg,rgba(255,255,255,.12),rgba(255,255,255,0) 34%);
  opacity:.6;
}
.study-preview::after{
  content:"";position:absolute;left:8%;right:8%;top:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(205,242,127,.7),transparent);
}
.preview-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.preview-label{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:9px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;
  color:rgba(236,245,231,.55);
}
.preview-label::before{content:"";width:5px;height:5px;border-radius:1px;background:var(--lime);transform:rotate(45deg);box-shadow:0 0 10px rgba(205,242,127,.8)}
.live-pill{
  display:inline-flex;align-items:center;gap:7px;white-space:nowrap;
  padding:4px 10px;border-radius:999px;
  border:1px solid rgba(205,242,127,.26);background:rgba(205,242,127,.07);
  font-family:var(--font-mono);font-size:8px;letter-spacing:.13em;text-transform:uppercase;color:#D8F8A6;
}
.live-pill::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--lime);animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1;box-shadow:0 0 0 0 rgba(205,242,127,.5)}50%{opacity:.6;box-shadow:0 0 0 4px rgba(205,242,127,0)}}
.preview-progress{
  position:relative;height:3px;margin:18px 0 20px;border-radius:3px;
  background:rgba(255,255,255,.09);overflow:hidden;
}
.preview-progress span{
  display:block;height:100%;width:20%;border-radius:3px;
  background:linear-gradient(90deg,#8ECF71,var(--lime));
  box-shadow:0 0 14px rgba(205,242,127,.55);
}
.preview-topic{
  display:flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.16em;text-transform:uppercase;
  color:rgba(205,242,127,.82);
}
.preview-topic span{
  padding:3px 7px;border:1px solid rgba(205,242,127,.22);border-radius:4px;
  color:rgba(232,243,224,.55);letter-spacing:.1em;
}
.preview-question{
  margin:13px 0 18px;
  font-family:var(--font-display);font-size:clamp(1.35rem,1.7vw,1.62rem);
  line-height:1.14;letter-spacing:-.012em;color:#F2F7EC;
  text-wrap:pretty;
}
.demo-options{display:grid;gap:8px}
.demo-option{
  display:flex;align-items:center;gap:12px;width:100%;
  padding:10px 13px;border-radius:11px;text-align:left;
  border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.045);
  color:rgba(241,247,237,.86);font-size:12.5px;font-weight:450;line-height:1.45;
  transition:border-color .25s,background .25s,transform .3s var(--ease),color .25s;
}
.demo-option > span{
  display:grid;place-items:center;width:24px;height:24px;flex:none;border-radius:6px;
  border:1px solid rgba(255,255,255,.13);background:rgba(255,255,255,.04);
  font-family:var(--font-mono);font-size:9px;color:rgba(236,244,232,.6);
  transition:background .25s,color .25s,border-color .25s;
}
.demo-option:hover{border-color:rgba(205,242,127,.5);background:rgba(205,242,127,.06);transform:translateX(2px);color:#fff}
.demo-option:hover > span{border-color:rgba(205,242,127,.4);color:var(--lime)}
.demo-option.correct{border-color:rgba(205,242,127,.72);background:rgba(205,242,127,.13);color:#F6FFE9}
.demo-option.correct > span{background:var(--lime);border-color:var(--lime);color:#0A1B12}
.demo-option.wrong{border-color:rgba(226,122,92,.62);background:rgba(226,122,92,.12);color:#FFEDE6}
.demo-option.wrong > span{background:#C9583D;border-color:#C9583D;color:#fff}
.demo-feedback{
  margin-top:13px;padding-left:2px;
  font-size:11px;line-height:1.65;color:rgba(205,242,127,.9);
}
.demo-feedback:empty{display:none}
.preview-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  margin-top:18px;padding-top:15px;border-top:1px solid rgba(255,255,255,.08);
  font-family:var(--font-mono);font-size:8px;letter-spacing:.14em;text-transform:uppercase;
  color:rgba(236,244,232,.4);
}
.preview-bottom a{color:var(--lime);text-decoration:none;letter-spacing:.1em;transition:opacity .2s}
.preview-bottom a:hover{opacity:.7}

.float-card{
  position:absolute;z-index:3;
  border-radius:14px;
  box-shadow:0 30px 60px -30px rgba(0,0,0,.85),inset 0 1px 0 rgba(255,255,255,.8);
}
.float-card.top{
  top:-58px;right:-2px;padding:13px 18px;transform:rotate(2.4deg);
  background:linear-gradient(160deg,#FBFDF2,#EDF3E1);
  border:1px solid rgba(255,255,255,.7);
  color:#0C2116;text-align:center;
  animation:floaty 7s ease-in-out infinite;
}
.float-card.top strong{
  display:block;font-family:var(--font-display);font-size:32px;line-height:.9;letter-spacing:-.02em;
}
.float-card.top span{
  display:block;margin-top:4px;
  font-family:var(--font-mono);font-size:7.5px;letter-spacing:.13em;text-transform:uppercase;color:#61735C;line-height:1.5;
}
.float-card.bottom{
  left:-14px;bottom:14px;padding:13px 17px;
  display:flex;align-items:center;gap:12px;
  background:linear-gradient(160deg,rgba(250,252,242,.97),rgba(232,240,219,.97));
  border:1px solid rgba(255,255,255,.6);
  color:#11241A;
  animation:floaty 8.5s ease-in-out infinite reverse;
}
.float-card.bottom .check{
  display:grid;place-items:center;width:27px;height:27px;flex:none;border-radius:50%;
  background:linear-gradient(150deg,#2C7E5D,#1A4B36);color:var(--lime);font-size:12px;
  box-shadow:0 4px 12px -4px rgba(26,75,54,.7);
}
.float-card.bottom strong{display:block;font-size:10.5px;font-weight:700;letter-spacing:-.01em;line-height:1.3}
.float-card.bottom div span{display:block;font-size:9px;color:#6A7B63;line-height:1.4;margin-top:2px}
@keyframes floaty{0%,100%{transform:translateY(0) rotate(2.4deg)}50%{transform:translateY(-7px) rotate(2.4deg)}}
.float-card.bottom{animation-name:floaty2}
@keyframes floaty2{0%,100%{transform:translateY(0)}50%{transform:translateY(6px)}}

.hazard-diamond{
  position:absolute;z-index:3;right:-38px;top:52%;
  width:62px;height:62px;display:grid;place-items:center;
  transform:translateY(-50%) rotate(45deg);border-radius:12px;pointer-events:none;
  background:linear-gradient(150deg,#1D553D,#0B251A);
  border:1px solid rgba(205,242,127,.4);
  box-shadow:0 20px 40px -18px rgba(0,0,0,.8),inset 0 1px 0 rgba(205,242,127,.25);
}
.hazard-diamond::before{content:"";position:absolute;inset:5px;border:1px solid rgba(205,242,127,.22);border-radius:7px}
.hazard-diamond span{
  transform:rotate(-45deg);font-family:var(--font-display);font-size:26px;color:var(--lime);line-height:1;padding-bottom:2px;
}
.hazard-diamond small{display:none}

/* ---------- Hero proof + marquee ---------- */
.hero-proof{
  position:relative;z-index:2;
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  border-top:1px solid rgba(255,255,255,.1);
}
.proof-item{
  display:flex;align-items:center;gap:13px;
  padding:24px 26px 26px;border-left:1px solid rgba(255,255,255,.07);
}
.proof-item:first-child{padding-left:0;border-left:0}
.proof-item strong{
  font-family:var(--font-display);font-size:clamp(1.9rem,2.6vw,2.5rem);font-weight:400;line-height:.9;
  color:#F4F8EE;letter-spacing:-.02em;flex:none;
}
.proof-item span{font-size:10px;line-height:1.55;color:rgba(232,241,228,.56);max-width:170px}
.proof-item svg{display:none}
.hero-marquee{
  position:relative;z-index:2;overflow:hidden;
  border-top:1px solid rgba(255,255,255,.06);
  background:rgba(255,255,255,.014);
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 7%,#000 93%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 7%,#000 93%,transparent);
}
.marquee-track{display:flex;width:max-content;align-items:center;padding:13px 0;animation:marquee 46s linear infinite}
.marquee-track span{
  font-family:var(--font-mono);font-size:9px;letter-spacing:.24em;text-transform:uppercase;
  color:rgba(232,241,228,.34);padding:0 20px;white-space:nowrap;
}
.marquee-track i{font-style:normal;font-size:6px;color:rgba(205,242,127,.6)}
@keyframes marquee{to{transform:translateX(-50%)}}
@keyframes hero-in{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
.hero-copy > *{animation:hero-in .95s var(--ease) both}
.hero-copy > *:nth-child(1){animation-delay:.05s}
.hero-copy > *:nth-child(2){animation-delay:.12s}
.hero-copy > *:nth-child(3){animation-delay:.2s}
.hero-copy > *:nth-child(4){animation-delay:.28s}
.hero-copy > *:nth-child(5){animation-delay:.36s}
.study-stage{animation:hero-in 1.1s .2s var(--ease) both}

/* ---------- Modes ---------- */
.mode-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.mode-card{
  position:relative;display:flex;flex-direction:column;overflow:hidden;
  padding:32px 30px 26px;border-radius:24px;
  background:linear-gradient(172deg,#FEFDF9,#F8F6ED);
  border:1px solid var(--line);
  box-shadow:inset 0 1px 0 #fff,var(--shadow-sm);
  transition:transform .45s var(--ease),box-shadow .45s var(--ease),border-color .35s;
}
.mode-card::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;opacity:0;
  background:radial-gradient(420px circle at var(--mx,50%) var(--my,0%),rgba(205,242,127,.32),transparent 65%);
  transition:opacity .4s;
}
.mode-card:hover{transform:translateY(-6px);border-color:#CDD6C2;box-shadow:inset 0 1px 0 #fff,0 34px 64px -44px rgba(12,38,25,.55)}
.mode-card:hover::before{opacity:1}
.mode-card > *{position:relative;z-index:1}
.mode-top{display:flex;align-items:center;gap:13px;margin-bottom:44px}
.mode-index{font-family:var(--font-mono);font-size:9px;letter-spacing:.18em;color:var(--muted-2)}
.mode-icon{
  display:grid;place-items:center;width:46px;height:46px;flex:none;border-radius:13px;
  background:linear-gradient(155deg,#FBFCEE,#E9EFDD);
  border:1px solid #DCE5CF;color:#416E52;
  box-shadow:inset 0 1px 0 #fff;
}
.mode-icon svg{width:21px;height:21px}
.mode-top .pill{
  margin-left:auto;padding:5px 10px;border-radius:999px;
  border:1px solid #DDE5D3;background:#F7FAF0;
  font-family:var(--font-mono);font-size:8px;letter-spacing:.13em;text-transform:uppercase;color:#5E7A5D;
  white-space:nowrap;
}
.mode-card h3{font-size:clamp(1.78rem,2.3vw,2.1rem);margin-bottom:12px;letter-spacing:-.02em}
.mode-card p{font-size:13px;line-height:1.75;color:var(--muted);max-width:285px}
.mode-meta{display:flex;flex-wrap:wrap;gap:7px;margin:26px 0 22px}
.mode-meta span{
  padding:5px 9px;border-radius:5px;background:#EFF2E6;border:1px solid #E2E7D7;
  font-family:var(--font-mono);font-size:8px;letter-spacing:.08em;text-transform:uppercase;color:#62755E;
}
.mode-link{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  margin-top:auto;padding-top:19px;border-top:1px solid var(--line);
  font-size:12.5px;font-weight:650;color:var(--ink-900);text-decoration:none;
}
.mode-link::after{content:"↗";font-size:18px;line-height:1;color:var(--jade);transition:transform .35s var(--ease)}
.mode-link:hover::after{transform:translate(3px,-3px)}

.mode-card.featured{
  background:linear-gradient(168deg,#123828 0%,#0A1F16 55%,#06130D 100%);
  border-color:rgba(205,242,127,.18);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08),0 40px 70px -50px rgba(7,24,16,.9);
  color:#EFF6EA;
}
.mode-card.featured::after{
  content:"";position:absolute;z-index:0;right:-90px;top:-110px;width:300px;height:300px;border-radius:50%;
  background:radial-gradient(circle,rgba(205,242,127,.16),transparent 66%);pointer-events:none;
}
.mode-card.featured::before{background:radial-gradient(420px circle at var(--mx,50%) var(--my,0%),rgba(205,242,127,.16),transparent 62%)}
.mode-card.featured:hover{border-color:rgba(205,242,127,.4);box-shadow:inset 0 1px 0 rgba(255,255,255,.1),0 46px 80px -50px rgba(0,0,0,.95)}
.mode-card.featured .mode-index{color:rgba(205,242,127,.45)}
.mode-card.featured .mode-icon{background:linear-gradient(155deg,rgba(205,242,127,.96),rgba(160,214,94,.9));border-color:rgba(205,242,127,.5);color:#0A1B12;box-shadow:0 12px 26px -14px rgba(205,242,127,.7)}
.mode-card.featured .pill{border-color:rgba(205,242,127,.3);background:rgba(205,242,127,.07);color:#D8F6A4}
.mode-card.featured h3{color:#F6FAF1}
.mode-card.featured p{color:rgba(232,241,228,.6)}
.mode-card.featured .mode-meta span{background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.1);color:rgba(232,241,228,.6)}
.mode-card.featured .mode-link{border-top-color:rgba(255,255,255,.12);color:#F6FAF1}
.mode-card.featured .mode-link::after{color:var(--lime)}

/* ---------- Syllabus rail ---------- */
.topics-section{
  position:relative;overflow:hidden;
  background:var(--ink-900);color:#EDF4E8;
  border-top:1px solid rgba(255,255,255,.06);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.topics-section::before{
  content:"";position:absolute;left:50%;top:-40%;width:1100px;height:700px;transform:translateX(-50%);
  background:radial-gradient(ellipse at center,rgba(58,132,95,.28),transparent 66%);pointer-events:none;
}
.topics-section::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(205,242,127,.035) 1px,transparent 1px);
  background-size:100% 96px;
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 30%,#000 70%,transparent);
  mask-image:linear-gradient(180deg,transparent,#000 30%,#000 70%,transparent);
}
.topics-section .wrap{position:relative;z-index:1}
.topics-section .eyebrow{color:#CDEF8A;opacity:.85;margin-bottom:14px}
.topics-section .eyebrow::before{box-shadow:0 0 0 3px rgba(205,242,127,.12),0 0 16px rgba(205,242,127,.45)}
.topic-browser{padding:0}
.topic-browser-head{display:flex;align-items:flex-end;justify-content:space-between;gap:36px;margin-bottom:34px}
.topic-browser-head h3{font-size:clamp(2rem,3vw,2.9rem);color:#F4F8EE;max-width:560px}
.topic-browser-head p{margin-top:12px;font-size:12.5px;color:rgba(232,241,228,.45);max-width:340px}
.rail-controls{display:flex;gap:8px;flex:none;padding-bottom:4px}
.icon-button{
  display:grid;place-items:center;width:44px;height:44px;padding:0;
  border-radius:50%;border:1px solid rgba(255,255,255,.16);
  background:rgba(255,255,255,.04);color:rgba(238,246,234,.8);
  font-size:15px;line-height:1;
  transition:background .25s,border-color .25s,color .25s,transform .3s var(--ease);
}
.icon-button:hover{background:var(--lime);border-color:var(--lime);color:#0A1B12;transform:translateY(-2px)}
.icon-button:active{transform:translateY(0)}
.topic-rail{
  display:flex;gap:14px;overflow-x:auto;overscroll-behavior-x:contain;
  scroll-snap-type:x proximity;scrollbar-width:none;
  padding:4px 2px 18px;margin:0 -2px;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 16px,#000 calc(100% - 60px),transparent);
  mask-image:linear-gradient(90deg,transparent,#000 16px,#000 calc(100% - 60px),transparent);
  cursor:grab;
}
.topic-rail::-webkit-scrollbar{display:none}
.topic-rail.dragging{cursor:grabbing;scroll-snap-type:none}
.topic-tile{
  position:relative;flex:0 0 272px;scroll-snap-align:start;
  display:flex;flex-direction:column;min-height:178px;
  padding:22px 22px 18px;border-radius:20px;
  border:1px solid rgba(255,255,255,.13);
  background:linear-gradient(168deg,rgba(255,255,255,.085),rgba(255,255,255,.022));
  text-decoration:none;color:inherit;
  transition:transform .4s var(--ease),border-color .3s,background .3s;
}
.topic-tile::before{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;opacity:.7;
  background:radial-gradient(120% 90% at 100% 0%,rgba(205,242,127,.12),transparent 55%);
}
.topic-tile::after{
  content:"";position:absolute;left:22px;right:22px;top:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(205,242,127,.65),transparent);
  opacity:0;transition:opacity .35s;
}
.topic-tile:hover{transform:translateY(-5px);border-color:rgba(205,242,127,.42);background:linear-gradient(168deg,rgba(205,242,127,.1),rgba(255,255,255,.02))}
.topic-tile:hover::after{opacity:1}
.topic-number{
  position:relative;font-family:var(--font-mono);font-size:8.5px;letter-spacing:.17em;
  color:rgba(205,242,127,.7);text-transform:uppercase;
}
.topic-tile h4{
  position:relative;margin:16px 0 24px;flex:1;
  font-family:var(--font-display);font-size:21px;line-height:1.18;letter-spacing:-.012em;
  color:#F1F7EC;text-wrap:pretty;
}
.tile-footer{
  position:relative;display:flex;align-items:center;justify-content:space-between;
  padding-top:13px;border-top:1px solid rgba(255,255,255,.09);
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.08em;text-transform:uppercase;
  color:rgba(232,241,228,.52);
}
.tile-footer span:last-child{color:var(--lime);font-size:12px;transition:transform .3s var(--ease)}
.topic-tile:hover .tile-footer span:last-child{transform:translate(2px,-2px)}
.drag-hint{
  margin-top:6px;font-family:var(--font-mono);font-size:8.5px;letter-spacing:.17em;
  text-transform:uppercase;color:rgba(232,241,228,.4);
}

/* ---------- States ---------- */
.state-section{background:linear-gradient(180deg,var(--paper) 0%,#F1EEE3 100%)}
.state-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:11px}
.state-link{
  display:flex;align-items:center;gap:12px;
  padding:14px 16px;border-radius:13px;
  border:1px solid var(--line);background:rgba(255,255,255,.7);
  color:var(--ink-900);text-decoration:none;font-size:12.5px;font-weight:600;letter-spacing:-.005em;
  transition:background .3s,color .3s,border-color .3s,transform .35s var(--ease),box-shadow .35s;
}
.state-code{
  display:grid;place-items:center;width:30px;height:30px;flex:none;border-radius:8px;
  background:#EEF1E4;border:1px solid #DFE5D3;
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.06em;color:#4F6B4C;
  transition:background .3s,color .3s,border-color .3s;
}
.state-link > span[aria-hidden]{margin-left:auto;opacity:.35;font-size:13px;transition:transform .3s var(--ease),opacity .3s}
.state-link:hover{background:var(--ink-900);border-color:var(--ink-900);color:#F4F8EE;transform:translateY(-2px);box-shadow:0 20px 36px -26px rgba(7,24,16,.8)}
.state-link:hover .state-code{background:var(--lime);border-color:var(--lime);color:#0A1B12}
.state-link:hover > span[aria-hidden]{opacity:1;color:var(--lime);transform:translate(2px,-2px)}
.search-box{position:relative;display:block;width:290px;flex:none}
.search-box input{
  width:100%;height:46px;padding:0 18px 0 44px;
  border:1px solid var(--line-strong);border-radius:999px;
  background:rgba(255,255,255,.78);color:var(--ink-900);
  font-size:12.5px;outline:none;
  transition:border-color .25s,box-shadow .25s,background .25s;
}
.search-box input::placeholder{color:#98A096}
.search-box input:focus{border-color:var(--jade);box-shadow:0 0 0 4px rgba(44,126,93,.1);background:#fff}
.search-box::before{
  content:"";position:absolute;left:17px;top:50%;width:13px;height:13px;transform:translateY(-62%);
  border:1.4px solid #7C8B80;border-radius:50%;pointer-events:none;
}
.search-box::after{
  content:"";position:absolute;left:28px;top:calc(50% + 3px);width:5px;height:1.4px;
  background:#7C8B80;transform:rotate(45deg);border-radius:2px;pointer-events:none;
}
.state-empty{margin-top:22px;font-size:12.5px;color:var(--muted)}
.state-empty a{color:var(--jade)}

/* ---------- Community strip ---------- */
.community-strip{
  position:relative;overflow:hidden;
  padding:clamp(44px,5vw,68px) 0;
  background:linear-gradient(118deg,#DCF9A3 0%,#CDF27F 46%,#BDEA6C 100%);
  color:#0A2115;
  border-top:1px solid rgba(10,33,21,.14);
  border-bottom:1px solid rgba(10,33,21,.14);
}
.community-strip::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(10,33,21,.14) 1px,transparent 1px);
  background-size:22px 22px;opacity:.22;
  -webkit-mask-image:radial-gradient(80% 120% at 88% 40%,#000,transparent 70%);
  mask-image:radial-gradient(80% 120% at 88% 40%,#000,transparent 70%);
}
.community-strip .wrap{position:relative;z-index:1;display:flex;align-items:center;gap:38px}
.community-strip-icon{
  font-family:var(--font-display);font-size:132px;line-height:.55;color:rgba(10,33,21,.14);
  height:58px;flex:none;margin-top:-14px;user-select:none;
}
.community-strip > .wrap > div{max-width:680px}
.community-strip .eyebrow{color:rgba(10,33,21,.5);margin-bottom:10px}
.community-strip .eyebrow::before{box-shadow:0 0 0 3px rgba(10,33,21,.08)}
.community-strip h2{color:#08200F;font-size:clamp(2rem,3.3vw,3rem);letter-spacing:-.022em}
.community-strip p{margin-top:10px;font-size:13px;color:rgba(10,33,21,.66);line-height:1.7}
.community-strip .btn{
  margin-left:auto;flex:none;background:transparent;border-color:rgba(8,32,15,.26);color:#08200F;
  box-shadow:none;
}
.community-strip .btn:hover{background:#08200F;border-color:#08200F;color:#EAFBB6}
.community-watermark{
  position:absolute;right:-60px;top:-90px;width:260px;height:260px;border-radius:44px;
  border:1px solid rgba(8,32,15,.12);transform:rotate(45deg);pointer-events:none;
}
.community-watermark::after{content:"";position:absolute;inset:34px;border-radius:30px;border:1px solid rgba(8,32,15,.1)}

/* ---------- Learn + FAQ ---------- */
.learn-grid{display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,.98fr);gap:clamp(48px,7vw,108px);align-items:start}
.learn-grid h2{font-size:clamp(2.4rem,4.2vw,3.9rem);margin-bottom:22px;letter-spacing:-.026em}
.learn-grid > div > p{max-width:430px;color:var(--muted);font-size:14px;line-height:1.85}
.steps{margin:38px 0 30px;border-top:1px solid var(--line)}
.step{display:grid;grid-template-columns:52px 1fr;gap:18px;padding:21px 0;border-bottom:1px solid var(--line)}
.step-number{
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.14em;color:var(--jade);
  padding-top:5px;
}
.step h3{font-size:1.28rem;margin-bottom:5px;letter-spacing:-.01em}
.step p{font-size:12.5px;line-height:1.7;color:var(--muted);margin:0}
.faq-list h2{margin-bottom:24px}
.faq-list .eyebrow{margin-bottom:16px}
details.faq{
  border:0;border-bottom:1px solid var(--line);
  padding:0;margin:0;background:none;
}
details.faq summary{
  position:relative;display:flex;align-items:center;gap:22px;
  padding:20px 0;cursor:pointer;list-style:none;
  font-size:13.5px;font-weight:600;letter-spacing:-.005em;color:var(--ink-900);
  transition:color .2s;
}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{
  content:"";margin-left:auto;flex:none;
  width:26px;height:26px;border-radius:50%;
  border:1px solid var(--line-strong);
  background-image:linear-gradient(var(--jade),var(--jade)),linear-gradient(var(--jade),var(--jade));
  background-repeat:no-repeat;
  background-position:center,center;
  background-size:9px 1px,1px 9px;
  transition:transform .35s var(--ease),background-color .3s,border-color .3s;
}
details.faq[open] summary::after{transform:rotate(90deg);background-color:var(--lime);border-color:var(--lime)}
details.faq summary:hover{color:var(--jade)}
details.faq p{padding:0 40px 22px 0;font-size:13px;line-height:1.8;color:var(--muted);max-width:480px}
details.faq[open] p{animation:card-in .35s var(--ease)}

/* ---------- CTA banner ---------- */
.cta-banner{
  position:relative;overflow:hidden;isolation:isolate;
  display:flex;align-items:center;justify-content:space-between;gap:44px;
  margin-bottom:clamp(56px,7vw,96px);padding:clamp(36px,4.6vw,60px);
  border-radius:28px;border:1px solid rgba(205,242,127,.16);
  background:linear-gradient(150deg,#123728 0%,#0A2117 48%,#050F0B 100%);
  color:#F2F7EC;
  box-shadow:0 50px 100px -60px rgba(7,24,16,.9),inset 0 1px 0 rgba(255,255,255,.09);
}
.cta-banner::before{
  content:"";position:absolute;z-index:-1;right:-120px;top:-160px;width:540px;height:540px;border-radius:50%;
  background:radial-gradient(circle,rgba(205,242,127,.17),transparent 64%);
}
.cta-banner::after{
  content:"";position:absolute;z-index:-1;right:32px;top:50%;width:340px;height:340px;transform:translateY(-50%) rotate(45deg);
  border:1px solid rgba(205,242,127,.12);border-radius:52px;pointer-events:none;
}
.cta-banner h2{color:#F6FAF1;font-size:clamp(2.2rem,3.7vw,3.4rem);max-width:600px;letter-spacing:-.026em}
.cta-banner p{margin-top:14px;font-size:13px;color:rgba(232,241,228,.52);line-height:1.7}
.cta-banner .btn{flex:none}

/* ===== 20-pages.css ===== */
/* =====================================================================
   Part 3/5 · Inner pages · Mastheads, cards, legal, guestbook
   ===================================================================== */

/* ---------- Page masthead ---------- */
body:not(.home) main.page-content{
  position:relative;isolation:isolate;
  padding-top:clamp(40px,5vw,64px);
  padding-bottom:clamp(56px,6vw,84px);
  min-height:60vh;
}
body:not(.home) main.page-content::before{
  content:"";position:absolute;z-index:-1;left:50%;top:-86px;
  width:100vw;height:640px;transform:translateX(-50%);
  background:
    radial-gradient(58% 100% at 12% 0%,rgba(205,242,127,.22),rgba(205,242,127,0) 72%),
    radial-gradient(52% 100% at 88% 4%,rgba(58,132,95,.12),transparent 70%),
    linear-gradient(180deg,#F0EEE3 0%,rgba(245,243,235,.6) 62%,rgba(245,243,235,0) 100%);
  pointer-events:none;
}
body:not(.home) main.page-content::after{
  content:"";position:absolute;z-index:-1;right:2.5%;top:56px;
  width:230px;height:230px;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 240 240'%3E%3Cg fill='none' stroke='%23133626'%3E%3Crect x='44' y='44' width='152' height='152' rx='30' transform='rotate(45 120 120)' stroke-opacity='.2'/%3E%3Crect x='68' y='68' width='104' height='104' rx='20' transform='rotate(45 120 120)' stroke-opacity='.1'/%3E%3C/g%3E%3Ctext x='120' y='140' font-family='Georgia,serif' font-size='58' text-anchor='middle' fill='%23133626' fill-opacity='.13'%3EH%3C/text%3E%3C/svg%3E");
  background-size:contain;background-repeat:no-repeat;
}
body:not(.home) main.page-content > *{position:relative}
.breadcrumb{
  display:flex;align-items:center;gap:9px;margin-bottom:34px;
  font-family:var(--font-mono);font-size:9px;letter-spacing:.14em;text-transform:uppercase;
  color:#8C978C;
}
.breadcrumb a{color:#6E7D6E;text-decoration:none;transition:color .2s}
.breadcrumb a:hover{color:var(--jade)}
.breadcrumb span:nth-child(2){opacity:.35}
.page-kicker{
  display:inline-flex;align-items:center;gap:10px;
  margin:0 0 16px;font-family:var(--font-mono);font-size:9.5px;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;color:var(--jade);
}
.page-kicker::before{content:"";width:6px;height:6px;background:currentColor;transform:rotate(45deg);box-shadow:0 0 0 3px rgba(44,126,93,.12)}
body:not(.home) main.page-content > h1{
  max-width:960px;margin:0 0 22px;letter-spacing:-.028em;
}
body:not(.home) main.page-content > .lede{max-width:660px;margin-bottom:0}
body:not(.home) main.page-content > h1 + .lede{margin-top:0}
body:not(.home) main.page-content > p:not(.lede):not(.page-kicker){
  max-width:720px;margin:18px 0 0;font-size:14px;line-height:1.85;color:var(--muted);
}
.test-meta{display:flex;flex-wrap:wrap;gap:8px;margin:26px 0 0}
.test-meta span{
  display:inline-flex;align-items:center;gap:7px;
  padding:7px 13px;border-radius:999px;
  border:1px solid var(--line);background:rgba(255,255,255,.66);
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.1em;text-transform:uppercase;
  color:#5E7562;line-height:1.4;
}
.test-meta span::before{content:"";width:4px;height:4px;border-radius:50%;background:var(--jade);opacity:.6}
.test-meta span+span::before{content:"";margin:0}

/* ---------- Content cards ---------- */
.card{
  position:relative;
  margin:clamp(26px,3vw,38px) 0;padding:clamp(24px,3vw,38px);
  background:linear-gradient(178deg,#FFFEFA,#FBFAF3);
  border:1px solid var(--line);border-radius:22px;
  box-shadow:inset 0 1px 0 #fff,0 1px 2px rgba(15,36,26,.03),0 30px 60px -50px rgba(15,36,26,.4);
}
.card h2{font-size:clamp(1.7rem,2.4vw,2.2rem);margin-bottom:14px;letter-spacing:-.02em}
.card h3{font-size:1.45rem;margin-bottom:10px;letter-spacing:-.015em}
.card p{font-size:13.5px;line-height:1.8;color:var(--muted);max-width:760px}
.card p + p{margin-top:12px}
.card > .btn-row{margin-top:24px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:26px 0}
.grid .card{margin:0}
.price-big,.card p.price-big{
  font-family:var(--font-display);font-size:clamp(3.4rem,5.2vw,4.6rem);line-height:1;color:var(--ink-900);
  letter-spacing:-.03em;margin-bottom:20px;
}
.price-big .small{
  display:inline-block;font-family:var(--font-sans);font-size:13px;font-weight:500;letter-spacing:0;
  color:var(--muted);margin-left:12px;vertical-align:middle;
}
.tag{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 10px;margin-bottom:16px;border-radius:5px;
  background:#F0F6E3;border:1px solid #E0E9CE;
  font-family:var(--font-mono);font-size:8px;letter-spacing:.08em;text-transform:uppercase;
  color:#5A7A4E;line-height:1.5;
}
.tag::before{content:"";width:4px;height:4px;border-radius:50%;background:#7FA95F}
.check-list{list-style:none;padding:0;margin:18px 0;max-width:720px}
.check-list li{
  position:relative;padding-left:32px;margin:12px 0;
  font-size:13.5px;line-height:1.8;color:var(--muted);
}
.check-list li::before{
  content:"✓";position:absolute;left:0;top:2px;
  display:grid;place-items:center;width:19px;height:19px;border-radius:50%;
  background:#EAF5E0;border:1px solid #D9E8C8;color:#4E7C3C;
  font-size:9px;font-weight:700;
}
.check-list li strong{color:var(--ink-900)}
.check-list a{color:var(--jade)}

/* ---------- About / FAQ panels ---------- */
details.test-about{
  margin:36px 0 8px;padding:0 24px;
  border:1px solid var(--line);border-radius:18px;
  background:rgba(255,255,255,.55);
}
details.test-about summary{
  display:flex;align-items:center;gap:12px;padding:19px 0;cursor:pointer;list-style:none;
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.16em;text-transform:uppercase;
  color:#5E7562;
}
details.test-about summary::-webkit-details-marker{display:none}
details.test-about summary::after{
  content:"+";margin-left:auto;font-family:var(--font-sans);font-size:16px;color:var(--jade);
  transition:transform .3s var(--ease);
}
details.test-about[open] summary::after{transform:rotate(45deg)}
details.test-about p{font-size:13px;line-height:1.85;color:var(--muted);padding:0 0 16px;max-width:820px}
details.test-about p:last-child{padding-bottom:22px}
details.test-about p.small{font-size:11.5px;color:var(--muted-2)}

/* ---------- Legal ---------- */
body:not(.home) main.legal-page{max-width:820px}
main.legal-page > h1{margin-bottom:14px}
main.legal-page > .lede{font-size:14px;color:var(--muted-2);margin-bottom:36px}
main.legal-page section{
  padding:30px 0;border-top:1px solid var(--line);
}
main.legal-page section:first-of-type{border-top:0;padding-top:12px}
main.legal-page h2{
  font-size:clamp(1.5rem,2vw,1.9rem);margin-bottom:14px;letter-spacing:-.018em;
}
main.legal-page section p{
  font-size:13.5px;line-height:1.9;color:#4C5A51;margin:12px 0;
}
main.legal-page section p + p{margin-top:12px}
main.legal-page .check-list{margin:18px 0}
main.legal-page .check-list li{font-size:13.5px;color:#4C5A51}
main.legal-page h3{font-size:1.15rem;margin:22px 0 8px}
main.legal-page a{color:var(--jade)}
main.legal-page details.faq{border-bottom:1px solid var(--line);background:transparent}
main.legal-page details.faq summary{padding:18px 0;font-size:13.5px}
main.legal-page details.faq p{padding-bottom:20px;font-size:13px}

/* ---------- Guestbook ---------- */
.guestbook-layout{
  display:grid;grid-template-columns:360px minmax(0,1fr);
  gap:clamp(28px,4vw,56px);align-items:start;
  margin:clamp(36px,4vw,50px) 0 64px;
}
.guestbook-compose{
  position:sticky;top:112px;overflow:hidden;contain:paint;
  padding:30px;border-radius:26px;
  background:linear-gradient(168deg,#123B2A 0%,#0A2117 55%,#061410 100%);
  border:1px solid rgba(205,242,127,.2);
  color:#F1F7EC;
  box-shadow:0 50px 90px -60px rgba(6,20,16,.95),inset 0 1px 0 rgba(255,255,255,.09);
}
.guestbook-compose::before{
  content:"";position:absolute;right:-90px;top:-100px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(205,242,127,.18),transparent 65%);pointer-events:none;
}
.guestbook-compose::after{
  content:"";position:absolute;left:24px;right:24px;top:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(205,242,127,.55),transparent);
}
.compose-icon{
  position:relative;display:grid;place-items:center;width:44px;height:44px;margin-bottom:24px;
  border-radius:50%;background:var(--lime);color:#0A1B12;
  font-size:19px;line-height:1;
  box-shadow:0 10px 24px -12px rgba(205,242,127,.9);
}
.guestbook-compose h2{position:relative;font-size:clamp(2rem,2.6vw,2.4rem);color:#F6FAF1;letter-spacing:-.022em}
.guestbook-compose > p{position:relative;margin-top:8px;font-size:12px;color:rgba(232,241,228,.5)}
.gb-form{position:relative;margin-top:6px}
.gb-form label{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin:20px 0 8px;
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.15em;text-transform:uppercase;
  color:rgba(205,242,127,.75);font-weight:500;
}
.gb-form label span{font-family:var(--font-mono);font-size:8px;letter-spacing:.06em;color:rgba(232,241,228,.32);font-weight:400}
.gb-form input,.gb-form textarea{
  width:100%;padding:13px 14px;border-radius:10px;
  border:1px solid rgba(255,255,255,.15);background:rgba(255,255,255,.055);
  color:#F3F8EE;font-size:12.5px;line-height:1.7;outline:none;
  transition:border-color .25s,background .25s,box-shadow .25s;
}
.gb-form textarea{min-height:142px;resize:vertical;font-family:inherit}
.gb-form input::placeholder,.gb-form textarea::placeholder{color:rgba(232,241,228,.3)}
.gb-form input:focus,.gb-form textarea:focus{
  border-color:rgba(205,242,127,.65);background:rgba(255,255,255,.08);
  box-shadow:0 0 0 3px rgba(205,242,127,.1);
}
.gb-form .btn{
  width:100%;margin-top:18px;justify-content:space-between;gap:20px;border:0;
  background:linear-gradient(180deg,#DBFA9F,var(--lime) 55%,#BFEC69);color:#0A1B12;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.6),0 14px 30px -18px rgba(175,227,88,.8);
}
.gb-form .btn:hover{background:linear-gradient(180deg,#EAFFB8,var(--lime-bright) 55%,#CBF37A)}
.gb-form .btn:hover{transform:translateY(-2px)}
.gb-public-note{margin-top:13px;font-size:9px;line-height:1.8;color:rgba(232,241,228,.45)}
.draft-note{margin-top:12px;font-family:var(--font-mono);font-size:8px;letter-spacing:.08em;text-transform:uppercase;color:rgba(232,241,228,.24)}
.gb-status{margin-top:12px;font-size:11px;line-height:1.7;color:rgba(232,241,228,.6)}
.gb-status:empty{display:none}
.gb-status.err{color:#F0A58D}
.gb-status.ok{color:#D6F7A3}
.gb-hp{position:fixed!important;left:-10000px;top:0;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}

.notes-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:18px}
.notes-head .eyebrow{margin-bottom:10px;font-size:9px}
.notes-head h2{font-size:clamp(2rem,2.8vw,2.6rem);letter-spacing:-.022em;display:flex;align-items:center;gap:12px}
.notes-head h2 span{
  display:inline-grid;place-items:center;min-width:26px;height:26px;padding:0 8px;
  border-radius:999px;background:#EAF2DE;border:1px solid #DCE6CB;
  font-family:var(--font-mono);font-size:9px;letter-spacing:0;color:#5A7350;vertical-align:middle;
}
.notes-head .icon-button{
  border-color:var(--line-strong);background:rgba(255,255,255,.6);color:var(--ink-900);
}
.notes-head .icon-button:hover{background:var(--ink-900);border-color:var(--ink-900);color:var(--lime)}
.notes-controls{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 0 18px;border-bottom:1px solid var(--line);margin-bottom:18px;
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted-2);
}
.notes-controls label{display:inline-flex;align-items:center;gap:9px}
.notes-controls select{
  appearance:none;padding:7px 30px 7px 11px;border-radius:8px;
  border:1px solid var(--line-strong);background:#fff;
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-900);
  background-image:linear-gradient(45deg,transparent 50%,#71806F 50%),linear-gradient(135deg,#71806F 50%,transparent 50%);
  background-position:calc(100% - 15px) 52%,calc(100% - 11px) 52%;
  background-size:4px 4px,4px 4px;background-repeat:no-repeat;cursor:pointer;
}
#gb-more{margin-top:18px}
#gb-list{display:flex;flex-direction:column;gap:12px}
.gb-item{
  display:grid;grid-template-columns:42px minmax(0,1fr);gap:16px;
  padding:22px 24px;border-radius:16px;
  border:1px solid var(--line);background:rgba(255,255,255,.78);
  box-shadow:inset 0 1px 0 #fff;
  transition:transform .35s var(--ease),box-shadow .35s,border-color .3s;
}
.gb-item:hover{transform:translateY(-2px);border-color:#D3DCC5;box-shadow:inset 0 1px 0 #fff,0 24px 40px -34px rgba(15,36,26,.5)}
.gb-avatar{
  display:grid;place-items:center;width:42px;height:42px;border-radius:50%;
  background:linear-gradient(145deg,#DDF7A8,#A9D96F);color:#12331F;
  font-family:var(--font-display);font-size:19px;line-height:1;
  border:1px solid rgba(255,255,255,.7);
  box-shadow:0 6px 16px -8px rgba(80,120,50,.6);
}
.gb-content{min-width:0}
.gb-head{display:flex;align-items:baseline;justify-content:space-between;gap:14px;margin-bottom:7px}
.gb-name{font-size:13px;font-weight:700;letter-spacing:-.005em;color:var(--ink-900)}
.gb-date{font-family:var(--font-mono);font-size:8px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted-2);white-space:nowrap}
.gb-msg{margin:0;font-size:13.5px;line-height:1.8;color:#455248;white-space:pre-wrap;overflow-wrap:anywhere}
.community-note{
  display:flex;gap:14px;align-items:flex-start;
  margin-top:26px;padding:18px 20px;border-radius:14px;
  border:1px dashed #CBD6BE;background:rgba(255,255,255,.4);
}
.community-note span{font-size:15px;color:var(--jade);line-height:1.2}
.community-note p{font-size:11px;line-height:1.75;color:var(--muted);margin:0}
.community-note a{color:var(--jade)}

/* ---------- Empty / loading states ---------- */
.empty-state{
  position:relative;
  padding:44px 28px 40px;border-radius:18px;border:1px dashed #CFD8C3;
  background:rgba(255,255,255,.45);text-align:center;
}
.empty-state::before{
  content:"";display:block;width:14px;height:14px;margin:0 auto 18px;
  border:1px solid #A9C093;border-radius:3px;transform:rotate(45deg);
  box-shadow:0 0 0 5px rgba(205,242,127,.18);
}
.empty-state h3{font-size:1.5rem;margin-bottom:8px}
.empty-state p{max-width:380px;margin:0 auto 18px;font-size:12.5px;line-height:1.75;color:var(--muted)}
.empty-state .btn{margin-top:4px}
.loading,.error{padding:44px 24px;text-align:center;font-size:13px;color:var(--muted)}
.loading::before{
  content:"";display:block;width:22px;height:22px;margin:0 auto 14px;
  border:2px solid var(--line-strong);border-top-color:var(--jade);border-radius:50%;
  animation:spin 1s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}
.error{color:var(--bad)}


/* ---------- Pricing showcase ---------- */
.pricing-card{overflow:hidden}
.pricing-card::after{
  content:"";position:absolute;right:-80px;top:50%;width:420px;height:420px;
  transform:translateY(-50%);pointer-events:none;
  background:radial-gradient(circle,rgba(205,242,127,.2),rgba(205,242,127,0) 66%);
}
.pricing-card > *{position:relative;z-index:1}
.pricing-stamp{text-align:center;justify-self:center;align-self:center}
.stamp-diamond{
  position:relative;display:grid;place-items:center;
  width:176px;height:176px;margin:0 auto;transform:rotate(45deg);border-radius:32px;
  border:1px solid #CFE0B5;background:linear-gradient(150deg,#FBFDF4,#E9F2D4);
  box-shadow:inset 0 1px 0 #fff,0 36px 60px -46px rgba(15,36,26,.6);
}
.stamp-diamond::before{content:"";position:absolute;inset:11px;border:1px solid #DCE8C7;border-radius:24px}
.stamp-diamond::after{content:"";position:absolute;inset:23px;border:1px dashed #C9DDB0;border-radius:17px}
.stamp-diamond b{
  transform:rotate(-45deg);font-family:var(--font-display);font-weight:400;
  font-size:58px;line-height:1;color:#143625;letter-spacing:-.03em;
}
.pricing-stamp p{
  margin:44px 0 0;font-family:var(--font-mono);font-size:7.5px;line-height:2;
  letter-spacing:.14em;text-transform:uppercase;color:#6C8063;
}
@media (min-width:1151px){
  .pricing-card{display:grid;grid-template-columns:minmax(0,1fr) 260px;column-gap:52px;align-items:start}
  .pricing-card > .price-big{grid-column:1;grid-row:1}
  .pricing-card > .check-list{grid-column:1;grid-row:2}
  .pricing-card > .btn-row{grid-column:1;grid-row:3}
  .pricing-stamp{grid-column:2;grid-row:1/4}
}
@media (max-width:1150px){.pricing-stamp{display:none}}

/* ===== 30-study.css ===== */
/* =====================================================================
   Part 4/5 · Study workspace · Quiz, results, bank, dialogs
   ===================================================================== */

/* ---------- Workspace shell ---------- */
.quiz-layout{
  display:grid;grid-template-columns:minmax(0,1fr) 296px;
  gap:clamp(22px,3vw,34px);align-items:start;
  margin:clamp(30px,4vw,42px) 0 24px;
}
.quiz-layout #quiz{min-width:0}
.quiz-layout.finished{grid-template-columns:minmax(0,1fr)}
.quiz-layout.finished .study-aside{display:none}
.quiz-progress{display:flex;flex-direction:column-reverse;gap:12px;margin:0 0 20px}
.quiz-progress .bar{
  height:4px;border-radius:999px;overflow:hidden;
  background:#E5E2D5;box-shadow:inset 0 1px 2px rgba(15,36,26,.06);
}
.quiz-progress .bar span{
  display:block;height:100%;border-radius:inherit;
  background:linear-gradient(90deg,#93D473,var(--lime-deep),var(--lime));
  box-shadow:0 0 12px rgba(180,228,92,.65);
  transition:width .55s var(--ease);
}
.quiz-count{
  display:flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:9px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--muted);
}
.quiz-count::before{
  content:"";width:5px;height:5px;background:var(--jade);transform:rotate(45deg);flex:none;
}
.session-resume{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  margin-bottom:18px;padding:13px 16px;border-radius:12px;
  background:linear-gradient(100deg,#F3F9E6,#EEF6DF);border:1px solid #DCE8C6;
  font-size:11.5px;color:#4E6B3E;
}
.session-resume button{
  border:1px solid #C9DAB1;background:#FBFDF5;padding:6px 12px;border-radius:999px;cursor:pointer;
  font-family:var(--font-mono);font-size:8px;letter-spacing:.1em;text-transform:uppercase;
  color:#3E6B32;white-space:nowrap;
  transition:background .2s,border-color .2s,color .2s;
}
.session-resume button:hover{background:#0D251A;border-color:#0D251A;color:var(--lime)}

/* ---------- Question card ---------- */
.quiz-card{
  position:relative;
  padding:clamp(24px,3.2vw,42px);
  border-radius:26px;border:1px solid var(--line);
  background:linear-gradient(178deg,#FFFEFA 0%,#FBFAF2 100%);
  box-shadow:inset 0 1px 0 #fff,0 1px 2px rgba(15,36,26,.03),0 44px 80px -68px rgba(15,36,26,.55);
  scroll-margin-top:120px;
}
.quiz-card::before{
  content:"";position:absolute;left:9%;right:9%;top:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(180,220,120,.7),transparent);
}
.quiz-card .tag{margin-bottom:18px}
.quiz-q{
  font-family:var(--font-display);
  font-size:clamp(1.55rem,2.3vw,2.05rem);
  line-height:1.16;letter-spacing:-.018em;
  color:#0F2118;margin:0 0 26px;text-wrap:pretty;
}
.quiz-q:focus,.score-big:focus{outline:none}
.opts{display:grid;gap:10px}
.opt-btn{
  position:relative;
  display:grid;grid-template-columns:32px minmax(0,1fr) 18px;align-items:center;gap:14px;
  width:100%;padding:13px 17px;border-radius:14px;
  border:1px solid #E5E2D5;background:#FFFEFA;
  font-size:13.5px;line-height:1.5;color:#1B2A22;text-align:left;
  transition:border-color .25s,background .25s,transform .3s var(--ease),box-shadow .3s;
}
.opt-btn .letter{
  display:grid;place-items:center;width:30px;height:30px;border-radius:8px;
  background:#F1F0E6;border:1px solid #E2DFD1;
  font-family:var(--font-mono);font-size:10px;font-weight:500;color:#5D6C60;
  transition:background .25s,color .25s,border-color .25s;
}
.opt-btn::after{content:"";display:grid;place-items:center;font-size:12px;color:#fff}
@media (hover:hover){
  .opt-btn:not(:disabled):hover{
    border-color:#B6C7A9;background:#FDFDF5;transform:translateX(2px);
    box-shadow:0 12px 26px -24px rgba(15,36,26,.7);
  }
  .opt-btn:not(:disabled):hover .letter{background:var(--lime);border-color:var(--lime);color:#0A1B12}
}
.opt-btn.selected{
  border-color:#173A29;background:#F4F8E8;
  box-shadow:0 0 0 3px rgba(44,126,93,.08);
}
.opt-btn.selected .letter{background:#0D251A;border-color:#0D251A;color:var(--lime)}
.opt-btn.correct{
  border-color:#4E9B6F;background:linear-gradient(178deg,#F4FBF2,#EBF7EC);
}
.opt-btn.correct .letter{background:#2C7E5D;border-color:#2C7E5D;color:#fff}
.opt-btn.correct::after{content:"✓";width:20px;height:20px;border-radius:50%;background:#2C7E5D;font-size:10px;line-height:1}
.opt-btn.wrong{
  border-color:#C97B62;background:linear-gradient(178deg,#FEF7F3,#FCEFE9);
}
.opt-btn.wrong .letter{background:#B34A33;border-color:#B34A33;color:#fff}
.opt-btn.wrong::after{content:"✕";width:20px;height:20px;border-radius:50%;background:#B34A33;font-size:9px;line-height:1}
.opt-btn[disabled]{cursor:default}
.opt-btn:disabled:not(.correct):not(.wrong){opacity:.55}

/* ---------- Explanation ---------- */
.explain{
  position:relative;overflow:hidden;
  margin-top:20px;padding:20px 22px 20px 24px;border-radius:16px;
  border:1px solid #E0E8D3;
  background:linear-gradient(178deg,#F9FBF1,#F2F6E7);
  animation:card-in .4s var(--ease);
}
.explain::before{
  content:"";position:absolute;left:0;top:16px;bottom:16px;width:2px;border-radius:2px;
  background:linear-gradient(180deg,var(--lime-deep),#6FAE5A);
}
.explain .verdict{
  display:flex;align-items:center;gap:8px;margin-bottom:10px;
  font-family:var(--font-mono);font-size:9px;font-weight:500;letter-spacing:.15em;text-transform:uppercase;
}
.explain .verdict::before{content:"";width:5px;height:5px;border-radius:50%;background:currentColor}
.explain .verdict.ok{color:#2C7E5D}
.explain .verdict.bad{color:#A7563F}
.explain > div:nth-child(2){font-size:13px;line-height:1.8;color:#435147}
.explain > div:nth-child(2) strong{color:#1B2A22;font-weight:700}
.explain .source{
  margin-top:13px;padding-top:12px;border-top:1px dashed #D7E1C9;
  font-family:var(--font-mono);font-size:9px;line-height:1.75;letter-spacing:.01em;color:#6E7D66;
}
.explain .source.small{font-size:9px}

/* ---------- Nav ---------- */
.quiz-nav{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  min-height:52px;margin-top:20px;
}
.quiz-nav > span:last-child{display:flex;flex-wrap:wrap;gap:9px;justify-content:flex-end;margin-left:auto}
.quiz-nav .btn{min-height:48px;font-size:12.5px}

/* ---------- Study aside ---------- */
.study-aside{
  position:sticky;top:110px;
  padding:24px;border-radius:22px;
  border:1px solid var(--line);background:rgba(255,255,255,.72);
  backdrop-filter:blur(14px);
  box-shadow:inset 0 1px 0 #fff,0 30px 50px -50px rgba(15,36,26,.5);
}
.aside-label{
  font-family:var(--font-mono);font-size:8px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted-2);
}
.study-aside h3{font-size:1.62rem;margin:9px 0 18px;letter-spacing:-.02em}
.question-map{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px}
.question-map button{
  height:34px;padding:0;border-radius:8px;
  border:1px solid #E2DFD1;background:#FFFEFA;
  font-family:var(--font-mono);font-size:10px;color:#6E7B70;
  transition:background .2s,border-color .2s,color .2s,transform .2s var(--ease),box-shadow .25s;
}
.question-map button:hover:not(:disabled){border-color:#9FB78E;transform:translateY(-1px)}
.question-map button:disabled{opacity:.5;cursor:default}
.question-map button.answered{background:#EDF7D9;border-color:#D3E7B4;color:#4E7134}
.question-map button.active{
  background:#0D251A;border-color:#0D251A;color:var(--lime);
  box-shadow:0 8px 16px -10px rgba(7,24,16,.9);
}
.question-map button.active.answered{background:#173F2B;color:var(--lime)}
.aside-divider{height:1px;background:var(--line);margin:18px 0}
.study-aside p{font-size:11px;line-height:1.8;color:var(--muted);margin:0}
.study-aside p + p{margin-top:10px}
.keyboard-tip{
  margin-top:16px !important;
  font-family:var(--font-mono);font-size:8px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted-2);
}
kbd{
  display:inline-grid;place-items:center;min-width:19px;height:18px;padding:0 5px;margin:0 1px;
  border-radius:4px;border:1px solid #DCD8C9;border-bottom-width:2px;
  background:#fff;color:#23362B;font-family:var(--font-mono);font-size:8.5px;line-height:1;
}

/* ---------- Results ---------- */
.results{padding-top:6px}
.score-panel{--pct:0;display:flex;align-items:center;gap:clamp(20px,3vw,34px);flex-wrap:wrap;margin:10px 0 26px}
.score-ring{
  position:relative;flex:none;width:132px;height:132px;border-radius:50%;
  background:conic-gradient(from -90deg,var(--lime-deep) 0deg,#A9D96F calc(var(--pct) * 3.6deg),#E4E1D2 calc(var(--pct) * 3.6deg));
  display:grid;place-items:center;
  box-shadow:0 18px 40px -26px rgba(15,36,26,.45);
}
.score-ring::before{
  content:"";position:absolute;inset:9px;border-radius:50%;
  background:linear-gradient(178deg,#FFFEFA,#FBFAF2);
  box-shadow:inset 0 1px 4px rgba(15,36,26,.06);
}
.score-ring > span{position:relative;display:grid;justify-items:center;gap:2px;text-align:center}
.score-ring strong{font-family:var(--font-display);font-size:34px;font-weight:400;line-height:1;color:#0F2118;letter-spacing:-.02em}
.score-ring small{font-family:var(--font-mono);font-size:6.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted-2)}
.score-copy{min-width:0}
.score-copy .small{display:block;font-family:var(--font-mono);font-size:8.5px;letter-spacing:.17em;text-transform:uppercase;color:var(--jade);margin-bottom:8px}
.score-big{
  font-family:var(--font-display);font-size:clamp(2.6rem,4.4vw,3.6rem);line-height:1;
  letter-spacing:-.025em;color:#0F2118;
}
.score-big em{font-style:normal;font-size:.5em;color:var(--muted-2);letter-spacing:0;margin-left:6px}
.pass-banner{
  position:relative;display:flex;gap:12px;align-items:flex-start;
  padding:16px 20px 16px 18px;border-radius:14px;margin:0 0 24px;
  font-size:12.5px;line-height:1.75;
}
.pass-banner::before{
  content:"✓";display:grid;place-items:center;width:20px;height:20px;flex:none;border-radius:50%;
  font-size:9px;color:#fff;margin-top:1px;
}
.pass-banner.ok{background:linear-gradient(100deg,#EFF8E7,#E9F6E1);border:1px solid #D6EAC4;color:#2C6042}
.pass-banner.ok::before{background:#4E8F5E}
.pass-banner.bad{background:linear-gradient(100deg,#FCF2EC,#FBEEE6);border:1px solid #F0D8CA;color:#8F4A32}
.pass-banner.bad::before{content:"!";background:#B85B3D;font-weight:700;font-family:var(--font-sans)}
.results .btn-row{margin-bottom:30px}
.results h3{font-size:clamp(1.5rem,2.2vw,1.9rem);margin:34px 0 6px;letter-spacing:-.018em}
.results > p.small{margin:0 0 18px;font-size:11px;line-height:1.75;color:var(--muted-2)}
.review-item{
  margin:10px 0;padding:20px 22px;border-radius:15px;
  border:1px solid var(--line);background:#FFFEFA;
  box-shadow:inset 0 1px 0 #fff;
}
.review-item .rq{font-family:var(--font-display);font-size:1.15rem;line-height:1.3;margin-bottom:10px;color:#0F2118}
.review-item .your{font-size:11.5px;line-height:1.7;color:#A2573F;margin:3px 0}
.review-item .right{font-size:11.5px;line-height:1.7;color:#2E6E4D;font-weight:600;margin:3px 0}
.review-item > div:nth-child(4){font-size:12.5px;line-height:1.8;color:#48554B;margin-top:10px}
.review-item .source{margin-top:10px;font-family:var(--font-mono);font-size:8.5px;color:#7A877A}
.results .review-item .source.small{font-size:8.5px}

/* ---------- Practice bank ---------- */
.progress-strip{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  margin:10px 0 22px;padding:6px;border-radius:22px;
  background:linear-gradient(150deg,#123829 0%,#0A2117 60%,#061410 100%);
  border:1px solid rgba(205,242,127,.16);
  box-shadow:0 34px 60px -54px rgba(7,24,16,.95),inset 0 1px 0 rgba(255,255,255,.08);
}
.progress-stat{padding:18px 22px;border-left:1px solid rgba(255,255,255,.08)}
.progress-stat:first-child{border-left:0}
.progress-stat strong{
  display:block;font-family:var(--font-display);font-weight:400;
  font-size:clamp(1.7rem,2.4vw,2.15rem);line-height:1;color:#F4F8EE;letter-spacing:-.02em;
}
.progress-stat span{
  display:block;margin-top:7px;
  font-family:var(--font-mono);font-size:7.5px;letter-spacing:.14em;text-transform:uppercase;
  color:rgba(232,241,228,.42);line-height:1.5;
}
.bank-toolbar{
  position:sticky;top:80px;z-index:60;
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  padding:9px;margin:0 0 6px;border-radius:16px;
  border:1px solid var(--line);background:rgba(246,244,236,.9);
  backdrop-filter:blur(18px) saturate(140%);
  box-shadow:0 20px 40px -38px rgba(15,36,26,.6);
}
.bank-tabs{display:flex;gap:4px;padding:4px;border-radius:11px;background:#EAE7DA}
.bank-tab{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 13px;border:0;border-radius:8px;background:transparent;
  font-size:11.5px;font-weight:600;color:#647160;line-height:1.3;
  transition:background .25s,color .2s,box-shadow .25s;
}
.bank-tab span{
  font-family:var(--font-mono);font-size:8.5px;font-weight:400;color:#8A9686;
  padding:1px 5px;border-radius:4px;background:rgba(255,255,255,.55);
}
.bank-tab:hover{color:var(--ink-900)}
.bank-tab.active{background:#fff;color:var(--ink-900);box-shadow:0 2px 8px rgba(15,36,26,.08)}
.bank-tab.active span{background:#EFF4E4;color:#4F6B43}
.bank-filters{display:flex;gap:8px;flex:1;justify-content:flex-end;flex-wrap:wrap;min-width:0}
.bank-filters input[type=search]{
  width:min(270px,100%);height:42px;padding:0 16px 0 40px;
  border:1px solid #DEDAca;border-radius:10px;background:#FFFEFA;color:var(--ink-900);
  font-size:12px;outline:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%237C8A7E' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='m20 20-3.5-3.5'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:15px center;
  transition:border-color .25s,box-shadow .25s;
}
.bank-filters input[type=search]::placeholder{color:#98A096}
.bank-filters input[type=search]:focus{border-color:var(--jade);box-shadow:0 0 0 3px rgba(44,126,93,.09);background-color:#fff}
.bank-filters select{
  height:42px;max-width:250px;padding:0 34px 0 13px;
  border:1px solid #DEDAca;border-radius:10px;background-color:#FFFEFA;color:#3C4A40;
  font-size:11.5px;outline:none;appearance:none;cursor:pointer;
  background-image:linear-gradient(45deg,transparent 50%,#7C8A7E 50%),linear-gradient(135deg,#7C8A7E 50%,transparent 50%);
  background-position:calc(100% - 16px) 52%,calc(100% - 12px) 52%;
  background-size:4px 4px,4px 4px;background-repeat:no-repeat;
  transition:border-color .25s;
}
.bank-filters select:focus{border-color:var(--jade)}
.bank-summary{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  margin:16px 0 14px;
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.11em;text-transform:uppercase;color:var(--muted-2);
}
.clear-notebook{
  border:0;background:none;padding:0;cursor:pointer;
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.1em;text-transform:uppercase;
  color:#A75940;text-decoration:underline;text-underline-offset:3px;
}
.bank-list{display:grid;gap:13px}
.practice-card{
  position:relative;scroll-margin-top:180px;
  padding:clamp(20px,2.6vw,28px);border-radius:20px;
  border:1px solid var(--line);background:linear-gradient(178deg,#FFFEFA,#FBFAF2);
  box-shadow:inset 0 1px 0 #fff,0 26px 44px -46px rgba(15,36,26,.55);
  transition:border-color .3s,box-shadow .3s;
}
.practice-card:hover{border-color:#D7DCC9;box-shadow:inset 0 1px 0 #fff,0 30px 52px -46px rgba(15,36,26,.6)}
.card-number{
  position:absolute;right:clamp(22px,3vw,34px);top:24px;
  font-family:var(--font-mono);font-size:8.5px;letter-spacing:.12em;color:#B1B9AB;
}
.practice-card .tag{margin-bottom:14px;margin-right:60px}
.practice-card .quiz-q{font-size:clamp(1.28rem,1.8vw,1.48rem);margin-bottom:16px}
.practice-card .opts{gap:8px}
.practice-card .opt-btn{padding:11px 16px}
.practice-card .explain{margin-top:18px}
.retry-question{
  display:inline-flex;align-items:center;gap:7px;margin-top:16px;padding:8px 13px;
  border:1px solid #DDE3D1;border-radius:999px;background:#F7FAEF;
  font-family:var(--font-mono);font-size:8px;letter-spacing:.08em;text-transform:uppercase;
  color:#4F7142;text-decoration:none;
  transition:background .25s,border-color .25s,color .25s;
}
.retry-question:hover{background:#0D251A;border-color:#0D251A;color:var(--lime)}
.pagination{display:flex;align-items:center;justify-content:center;gap:14px;margin:30px 0 6px}
.pagination span{font-family:var(--font-mono);font-size:9px;letter-spacing:.12em;color:var(--muted)}
.pagination .btn{min-height:44px;padding:0 20px;font-size:11.5px}
.bank-list > p.small{margin-top:16px}

/* ---------- Confirm dialog ---------- */
.confirm-dialog{
  width:min(470px,calc(100% - 36px));padding:30px;border-radius:22px;
  border:1px solid rgba(255,255,255,.65);
  background:linear-gradient(172deg,#FEFDF7,#F2F1E6);
  color:#17271E;box-shadow:0 60px 120px -40px rgba(0,0,0,.65);
}
.confirm-dialog::backdrop{background:rgba(5,16,11,.58);backdrop-filter:blur(7px)}
.confirm-dialog h3{font-size:1.8rem;margin-bottom:8px;letter-spacing:-.02em}
.confirm-dialog p{font-size:13px;line-height:1.8;color:var(--muted);margin:14px 0 24px}
.confirm-dialog .btn-row{justify-content:flex-end;margin:0}
.confirm-dialog .btn{min-height:46px;font-size:12px}
.confirm-dialog[open]{animation:card-in .25s var(--ease)}


/* ---------- Wide result composition ---------- */
@media (min-width:981px){
  .quiz-layout.finished .results{
    display:grid;grid-template-columns:minmax(300px,.82fr) minmax(0,1.38fr);
    column-gap:52px;align-items:start;
  }
  .quiz-layout.finished .score-panel{grid-column:1;grid-row:1;margin:0;align-self:center}
  .quiz-layout.finished .pass-banner{grid-column:2;grid-row:1;margin:0;align-self:center}
  .quiz-layout.finished .results .btn-row{grid-column:2;grid-row:2;margin:20px 0 0}
  .quiz-layout.finished .results h3{grid-column:1/-1;grid-row:3;margin-top:44px}
  .quiz-layout.finished .results > p.small{grid-column:1/-1;grid-row:4}
  .quiz-layout.finished .review-item{grid-column:1/-1}
  .quiz-layout.finished .results > p:not(.small){grid-column:1/-1;margin-top:24px}
}

/* ===== 40-responsive.css ===== */
/* =====================================================================
   Part 5/5 · Responsive · Motion preferences · Print
   ===================================================================== */

@media (max-width:1240px){
  .wrap{width:min(1240px,100% - 64px)}
  .main-nav a{padding:0 11px}
  .hero-copy h1{font-size:clamp(3.1rem,5.4vw,5rem)}
}

@media (max-width:1120px){
  .site-header .wrap{gap:16px}
  .brand{font-size:15.5px}
  .brand em{font-size:18px}
  .main-nav a{font-size:11.5px;padding:0 9px}
  .main-nav .nav-es{margin-left:4px}
  .hero-grid{gap:30px}
  .hero-copy h1{font-size:clamp(2.95rem,5.2vw,4.4rem)}
  .float-card.top{right:-2px}
  .float-card.bottom{left:-4px}
  .hazard-diamond{right:-20px}
  .mode-card{padding:28px 24px 24px}
  .mode-top{margin-bottom:36px}
  .state-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
  .quiz-layout{grid-template-columns:minmax(0,1fr) 268px}
  .study-aside{padding:20px}
}

/* ---------- Hero stacks below 980px ---------- */
@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:34px;padding:52px 0 44px}
  .hero-copy{max-width:640px}
  .hero-copy h1{font-size:clamp(3.2rem,8.6vw,4.7rem);max-width:600px}
  .hero-lede{max-width:500px}
  .study-stage{max-width:640px;width:100%;margin:0 auto;padding:16px 4px 10px}
  .study-stage .float-card,.study-stage .hazard-diamond{display:none}
  .hero-proof{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ---------- Tablet / nav collapse ---------- */
@media (max-width:1040px){
  .site-header .wrap{gap:12px}
  .main-nav{
    display:none;position:absolute;left:0;right:0;top:100%;
    flex-direction:column;align-items:stretch;gap:2px;
    margin:0;padding:14px 24px 20px;
    background:#04100A;
    border-bottom:1px solid rgba(255,255,255,.1);
    box-shadow:0 30px 50px -30px rgba(0,0,0,.8);
  }
  .main-nav.open{display:flex}
  .main-nav a{height:auto;padding:13px 14px;font-size:13.5px;border-radius:10px;color:rgba(238,245,234,.75)}
  .main-nav a::after{display:none}
  .main-nav a[aria-current=page]{background:rgba(205,242,127,.09);color:var(--lime)}
  .main-nav a:hover{background:rgba(255,255,255,.06)}
  .main-nav .nav-es{width:max-content;height:30px;margin:8px 14px 0;padding:0 10px;font-size:9.5px}
  .menu-toggle{display:grid;place-items:center;margin-left:0}
  .nav-start{margin-left:auto}
  .hero-copy h1{font-size:clamp(3.1rem,6vw,4.6rem)}
  .hero-proof{grid-template-columns:repeat(2,minmax(0,1fr))}
  .proof-item{padding:20px 22px 22px}
  .proof-item:nth-child(3){border-left:0;padding-left:0}
  .proof-item:nth-child(n+3){border-top:1px solid rgba(255,255,255,.07)}
  .mode-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .mode-card.featured{grid-column:1/-1}
  .mode-card.featured{min-height:0}
  .mode-card.featured .mode-top{margin-bottom:30px}
  .mode-card.featured h3{font-size:2.3rem}
  .state-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .learn-grid{grid-template-columns:1fr;gap:56px}
  .learn-grid > div > p{max-width:560px}
  .faq-list{max-width:720px}
  .quiz-layout{grid-template-columns:1fr;gap:18px}
  .study-aside{
    position:static;order:-1;display:block;padding:16px 18px;
  }
  .study-aside .aside-label{display:block;font-size:7.5px}
  .study-aside h3{margin:3px 0 12px;font-size:1.28rem}
  .study-aside .aside-divider{display:none}
  .study-aside > p{display:none}
  .question-map{grid-template-columns:repeat(10,minmax(0,1fr));gap:5px}
  .question-map button{height:29px;font-size:9.5px}
  .quiz-card{scroll-margin-top:160px}
  .bank-toolbar{top:76px}
}

@media (max-width:900px){
  .wrap{width:calc(100% - 48px)}
  .hero-grid{padding-top:clamp(42px,7vw,64px)}
  .study-stage{max-width:640px;width:100%;margin:0 auto;padding:14px 4px 14px}
  .section-head{align-items:flex-start;flex-direction:column;gap:20px}
  .section-head p{text-align:left;max-width:460px}
  .state-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .guestbook-layout{grid-template-columns:1fr;gap:32px}
  .guestbook-compose{position:static;max-width:none}
  .cta-banner{flex-direction:column;align-items:flex-start;gap:26px}
  .cta-banner::after{right:-90px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:40px}
  .footer-brand{grid-column:1/-1}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:18px}
  .progress-stat{padding:15px 16px}
  .progress-stat strong{font-size:1.75rem}
  .progress-stat span{font-size:6.5px;letter-spacing:.1em}
}

/* ---------- Mobile ---------- */
@media (max-width:760px){
  html{scroll-padding-top:88px}
  body{font-size:15px}
  .wrap{width:calc(100% - 40px)}
  .site-header .wrap{height:68px;gap:10px}
  .site-header.scrolled .wrap{height:62px}
  .brand{font-size:15px;gap:10px}
  .brand-mark{width:30px;height:30px;border-radius:8px}
  .brand-mark span{font-size:19px}
  .brand em{font-size:17px}
  .nav-start{height:38px;padding:0 14px;font-size:11px}
  .home-hero .hero-grid{grid-template-columns:1fr;gap:38px;padding:44px 0 40px}
  .hero-copy h1{font-size:clamp(2.9rem,10.5vw,4rem);max-width:560px}
  .hero-lede{max-width:480px;font-size:14px;margin-top:22px}
  .hero-copy .btn-row{margin-top:28px;gap:9px}
  .hero-note{gap:6px;margin-top:22px}
  .hero-note span{font-size:8px;padding:5px 9px}
  .hero-proof{grid-template-columns:repeat(2,minmax(0,1fr))}
  .proof-item{padding:18px 16px 20px;gap:10px}
  .proof-item strong{font-size:1.8rem}
  .proof-item span{font-size:9px}
  .hero-marquee .marquee-track span{font-size:8px;padding:0 15px}
  .mode-grid{grid-template-columns:1fr}
  .mode-card.featured{grid-column:auto}
  .mode-card{min-height:0;padding:26px 24px 22px}
  .mode-top{margin-bottom:26px}
  .mode-card.featured h3{font-size:2rem}
  .mode-card h3{font-size:1.9rem}
  .mode-card p{max-width:100%}
  .topic-browser-head{align-items:flex-start;flex-direction:column;gap:18px}
  .topic-browser-head h3{font-size:2rem}
  .rail-controls{padding-bottom:0}
  .topic-tile{flex-basis:236px;min-height:176px;padding:19px 19px 15px}
  .topic-tile h4{font-size:19px;margin:14px 0 18px}
  .icon-button{width:40px;height:40px}
  .state-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .state-link{padding:12px 13px;font-size:12px;gap:10px}
  .search-box{width:100%}
  .community-strip .wrap{flex-wrap:wrap;gap:20px}
  .community-strip-icon{font-size:90px;height:44px;margin:0}
  .community-strip .btn{margin-left:0}
  .community-strip h2{font-size:2rem}
  .home-section{padding:58px 0}
  .cta-banner{padding:30px;border-radius:22px}
  .cta-banner::after{display:none}
  .cta-banner .btn{width:100%}
  .step{grid-template-columns:40px 1fr;gap:14px}
  .footer-grid{gap:32px;grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .footer-bottom{margin-top:38px}
  .site-footer{padding-top:56px}
  body:not(.home) main.page-content{padding-top:34px}
  body:not(.home) main.page-content::after{display:none}
  body:not(.home) main.page-content::before{height:480px}
  .breadcrumb{margin-bottom:24px;font-size:8px;gap:7px}
  .page-kicker{font-size:8.5px;letter-spacing:.18em;margin-bottom:12px}
  body:not(.home) main.page-content > h1{font-size:clamp(2.5rem,9vw,3.6rem);margin-bottom:18px}
  .test-meta{margin-top:20px}
  .test-meta span{font-size:8px;padding:6px 10px}
  .card{padding:22px;border-radius:18px}
  .quiz-layout{margin-top:26px}
  .quiz-card{padding:22px 20px;border-radius:20px}
  .quiz-q{font-size:1.55rem;margin-bottom:20px}
  .opt-btn{padding:12px 14px;gap:11px;font-size:12.5px}
  .opt-btn .letter{width:28px;height:28px}
  .explain{padding:17px 18px 17px 20px}
  .quiz-nav .btn,.quiz-nav .btn-ghost{min-height:44px;font-size:11.5px;padding:0 18px}
  .study-aside{padding:16px 16px;border-radius:18px}
  .question-map{grid-template-columns:repeat(10,minmax(0,1fr));gap:5px}
  .question-map button{height:27px;font-size:9px}
  .study-aside h3{font-size:1.2rem;margin-bottom:6px}
  .score-ring{width:112px;height:112px}
  .score-ring strong{font-size:29px}
  .score-big{font-size:2.4rem}
  .bank-toolbar{top:66px;padding:8px;gap:8px}
  .bank-tabs{width:100%}
  .bank-tab{flex:1;justify-content:center;padding:8px 6px;font-size:10.5px}
  .bank-filters{width:100%}
  .bank-filters input[type=search]{width:100%;flex:1 1 100%}
  .bank-filters select{max-width:none;width:100%}
  .bank-summary{font-size:7.5px;letter-spacing:.08em}
  .practice-card{padding:20px 18px}
  .practice-card .tag{margin-right:0;margin-bottom:26px}
  .card-number{top:18px;right:18px}
  .pagination{gap:10px}
  .pagination .btn{min-height:42px;padding:0 14px;font-size:10.5px}
  .guestbook-compose{padding:24px;border-radius:20px}
  .guestbook-compose h2{font-size:2rem}
  .gb-item{padding:18px 16px;gap:12px;grid-template-columns:36px minmax(0,1fr)}
  .gb-avatar{width:36px;height:36px;font-size:16px}
  .gb-head{flex-direction:column;align-items:flex-start;gap:3px}
  .notes-head h2{font-size:2rem}
  .notes-controls{font-size:7.5px}
  .footer-bottom > div{gap:14px}
  .footer-bottom a{font-size:8.5px}
}

@media (max-width:520px){
  .wrap{width:calc(100% - 32px)}
  .hero-copy h1{font-size:clamp(2.7rem,11.9vw,3.5rem)}
  .hero-copy .eyebrow{font-size:8.5px;letter-spacing:.19em;margin-bottom:18px}
  .hero-lede{font-size:13px;line-height:1.8}
  .hero-copy .btn-row .btn{width:100%}
  .hero-copy .btn-row .btn-ghost{width:100%}
  .hero-note span{font-size:7.5px}
  .float-card.top{padding:10px 14px;top:-8px;right:-6px}
  .float-card.top strong{font-size:25px}
  .float-card.top span{font-size:6.5px}
  .float-card.bottom{padding:10px 13px;left:-6px;bottom:6px;gap:9px}
  .float-card.bottom .check{width:23px;height:23px;font-size:10px}
  .float-card.bottom strong{font-size:9px}
  .float-card.bottom div span{font-size:7.5px}
  .hazard-diamond{width:48px;height:48px;right:-4px;bottom:30px}
  .hazard-diamond span{font-size:21px}
  .hazard-diamond small{display:none}
  .preview-top{flex-wrap:wrap;gap:8px}
  .preview-label{font-size:8px;letter-spacing:.14em}
  .live-pill{font-size:7px;padding:3px 8px}
  .preview-question{font-size:1.2rem}
  .demo-option{font-size:11.5px;padding:9px 11px}
  .preview-bottom{font-size:7px;flex-wrap:wrap;gap:6px}
  .proof-item{flex-direction:column;align-items:flex-start;gap:6px}
  .proof-item span{font-size:8.5px}
  .state-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .state-link{padding:10px 11px;font-size:11.5px;gap:8px}
  .state-code{width:27px;height:27px;font-size:8px}
  .section-head h2{font-size:2rem}
  .learn-grid h2{font-size:2.3rem}
  .community-strip-icon{display:none}
  .community-strip h2{font-size:1.8rem}
  .community-strip p{font-size:12px}
  .community-strip .btn{width:100%}
  .footer-brand p{font-size:11.5px}
  .site-footer::after{display:none}
  .quiz-card{padding:20px 16px}
  .quiz-q{font-size:1.4rem}
  .tag{font-size:7px}
  .study-aside .keyboard-tip{display:none}
  .question-map{grid-template-columns:repeat(6,minmax(0,1fr))}
  .question-map button{height:30px;font-size:9.5px}
  .results .btn-row .btn{width:100%}
  .score-panel{gap:18px}
  .score-ring{width:98px;height:98px}
  .score-ring::before{inset:7px}
  .score-ring strong{font-size:25px}
  .score-big{font-size:2.05rem}
  .bank-tab{font-size:9.5px;padding:8px 4px;gap:4px}
  .bank-tab span{font-size:7.5px}
  .practice-card .quiz-q{font-size:1.22rem}
  .progress-stat{padding:13px 12px}
  .progress-stat strong{font-size:1.55rem}
  .progress-stat span{font-size:6px;letter-spacing:.06em}
  .guestbook-notes .notes-head{align-items:center}
  .notes-head h2{font-size:1.75rem;gap:8px}
  .gb-form .btn{font-size:11.5px}
  .confirm-dialog{padding:24px}
  .confirm-dialog h3{font-size:1.55rem}
  .confirm-dialog .btn{flex:1;min-height:44px}
}

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .reveal{opacity:1;transform:none}
  .hero-copy > *,.study-stage{animation:none}
  .marquee-track{animation:none;transform:none}
  .study-preview{transform:none!important}
  .hero-route path{animation:none}
}

/* ---------- Print ---------- */
@media print{
  .site-header,.site-footer,.hero-marquee,.rail-controls,.bank-toolbar,.quiz-nav,.btn-row,.study-aside{display:none!important}
  body{background:#fff;color:#000;font-size:11pt}
  body::after{display:none}
  .wrap{width:100%}
  .quiz-card,.card,.practice-card{box-shadow:none;border:1px solid #ccc;break-inside:avoid}
  .home-hero{background:#fff;color:#000}
  .home-hero h1,.hero-copy h1,.hero-copy h1 em{color:#000}
}