/* QuizGuard marketing site. Colors follow the app's own tokens (globals.css, dark theme). */

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 300 900;
  font-display: swap;
  src: url(/assets/fonts/inter-latin.woff2) format('woff2');
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 100 800;
  font-display: swap;
  src: url(/assets/fonts/jetbrains-mono-latin.woff2) format('woff2');
}

:root {
  --primary-300: #a5b4fc;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  --success-400: #4ade80;
  --warning-400: #fb923c;
  --bg: #0a0a1a;
  --bg-2: #0f1029;
  --bg-3: #13153a;
  --elevated: #1a1c3a;
  --border: #2a2d52;
  --border-soft: rgb(129 140 248 / 0.18);
  --text: #f1f5f9;
  --text-2: #b4bfd0;
  --text-3: #8391a7;
  --radius: 16px;
  --radius-sm: 10px;
  --wrap: 1180px;
  --header-h: 68px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 17px/1.6 Inter, system-ui, -apple-system, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, video { display: block; max-width: 100%; height: auto; }
a { color: var(--primary-300); text-decoration: none; }
a:hover { color: #fff; }
h1, h2, h3 { margin: 0; line-height: 1.12; letter-spacing: -0.03em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
:focus-visible { outline: 2px solid var(--primary-400); outline-offset: 3px; border-radius: 6px; }

.sprite { display: none; }
.i { width: 1.15em; height: 1.15em; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 16px; top: -60px; z-index: 100; padding: 10px 16px; border-radius: var(--radius-sm); background: var(--primary-600); color: #fff; }
.skip:focus { top: 12px; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 820px; }
.center { text-align: center; }

/* ─── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: 46px; padding: 0 22px; border-radius: 999px; border: 1px solid transparent;
  font: 600 16px/1 Inter, sans-serif; cursor: pointer; white-space: nowrap;
  transition: background .2s, border-color .2s, transform .2s, box-shadow .2s;
}
.btn-sm { height: 40px; padding: 0 18px; font-size: 15px; }
.btn-lg { height: 54px; padding: 0 28px; font-size: 17px; }
.btn-block { width: 100%; }
.btn-primary { background: linear-gradient(135deg, var(--primary-500), var(--primary-700)); color: #fff; box-shadow: 0 12px 30px -10px rgb(79 70 229 / .8), inset 0 1px 0 rgb(255 255 255 / .2); }
.btn-primary:hover { color: #fff; transform: translateY(-1px); box-shadow: 0 16px 36px -10px rgb(99 102 241 / .9), inset 0 1px 0 rgb(255 255 255 / .25); }
.btn-ghost { background: rgb(255 255 255 / .04); border-color: var(--border); color: var(--text); }
.btn-ghost:hover { color: #fff; background: rgb(255 255 255 / .08); border-color: var(--primary-400); }
.btn[disabled] { opacity: .6; cursor: progress; transform: none; }

/* ─── Header ──────────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50; height: var(--header-h);
  background: rgb(10 10 26 / .72); backdrop-filter: saturate(160%) blur(14px); -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent; transition: border-color .2s, background .2s;
}
.site-header.scrolled { border-bottom-color: var(--border); background: rgb(10 10 26 / .88); }
.header-row { height: 100%; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: #fff; font-weight: 800; font-size: 20px; letter-spacing: -0.03em; }
.brand:hover { color: #fff; }
.mark {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; color: #fff;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  box-shadow: 0 8px 20px -6px rgb(79 70 229 / .8), inset 0 1px 0 rgb(255 255 255 / .25);
}
.mark .i { width: 20px; height: 20px; stroke-width: 1.6; }
.mark-sm { width: 30px; height: 30px; border-radius: 8px; }
.mark-sm .i { width: 17px; height: 17px; }
.nav { display: flex; gap: 26px; margin-left: auto; }
.nav a { color: var(--text-2); font-size: 15px; font-weight: 500; }
.nav a:hover { color: #fff; }
.menu-btn { display: none; margin-left: 4px; width: 42px; height: 42px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: transparent; color: var(--text); cursor: pointer; place-items: center; }
.menu-btn .i { width: 20px; height: 20px; }

/* ─── Hero ────────────────────────────────────────────────────── */
.hero { position: relative; padding: 84px 0 40px; text-align: center; isolation: isolate; }
.hero::before {
  content: ''; position: absolute; inset: -120px 0 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(900px 520px at 22% 8%, rgb(67 56 202 / .42), transparent 65%),
    radial-gradient(700px 480px at 85% 30%, rgb(99 102 241 / .22), transparent 70%),
    radial-gradient(1000px 600px at 50% 100%, rgb(49 46 129 / .35), transparent 70%);
}
.hero::after {
  content: ''; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: .5;
  background-image: linear-gradient(rgb(255 255 255 / .035) 1px, transparent 1px), linear-gradient(90deg, rgb(255 255 255 / .035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 20%, #000 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 20%, #000 20%, transparent 70%);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 16px; border-radius: 999px;
  font-size: 14px; font-weight: 500; color: var(--primary-300);
  background: rgb(99 102 241 / .12); border: 1px solid rgb(129 140 248 / .3);
}
.hero h1 { margin: 26px auto 0; max-width: 980px; font-size: clamp(42px, 7.4vw, 88px); font-weight: 800; letter-spacing: -0.045em; line-height: 1.02; }
.grad { background: linear-gradient(100deg, #c7d2fe 0%, var(--primary-400) 55%, #a78bfa 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { margin: 26px auto 0; max-width: 720px; font-size: clamp(17px, 2vw, 20px); color: var(--text-2); }
.cta-row { margin-top: 36px; display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }
.ticks { margin-top: 26px; display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 26px; color: var(--text-2); font-size: 15px; }
.ticks li { display: inline-flex; align-items: center; gap: 8px; }
.ticks .i { color: var(--success-400); }

/* ─── Windows (screenshots and video) ─────────────────────────── */
.window {
  margin: 0; border-radius: var(--radius); overflow: hidden; background: var(--bg-2);
  border: 1px solid var(--border);
  box-shadow: 0 50px 100px -40px rgb(0 0 0 / .85), 0 0 0 1px rgb(255 255 255 / .02) inset;
}
.window-bar { height: 38px; display: flex; align-items: center; gap: 7px; padding: 0 14px; background: #121433; border-bottom: 1px solid var(--border); position: relative; }
.window-bar i { width: 11px; height: 11px; border-radius: 50%; background: #2c2f57; }
.window-bar span { position: absolute; left: 70px; right: 70px; text-align: center; font-size: 12.5px; color: var(--text-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.video-window { margin: 64px auto 0; max-width: 1060px; box-shadow: 0 60px 140px -40px rgb(67 56 202 / .55), 0 40px 80px -30px rgb(0 0 0 / .8); }
.video-box { position: relative; aspect-ratio: 16 / 9; background: #07071a; }
.video-box video { width: 100%; height: 100%; object-fit: cover; }
.play {
  display: none; position: absolute; inset: 0; border: 0; padding: 0; cursor: pointer;
  background: radial-gradient(circle at 50% 55%, rgb(10 10 26 / .05), rgb(10 10 26 / .45));
  color: #fff; font: inherit; flex-direction: column; align-items: center; justify-content: flex-end; gap: 14px; padding-bottom: 7%;
}
.js .play { display: flex; }
.play.hidden { display: none; }
.play-disc {
  width: 84px; height: 84px; border-radius: 50%; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  box-shadow: 0 0 0 10px rgb(99 102 241 / .18), 0 20px 50px -10px rgb(79 70 229 / .9);
  transition: transform .2s, box-shadow .2s;
}
.play-disc .i { width: 34px; height: 34px; margin-left: 4px; fill: #fff; stroke: #fff; }
.play:hover .play-disc { transform: scale(1.06); box-shadow: 0 0 0 14px rgb(99 102 241 / .22), 0 20px 50px -10px rgb(79 70 229 / 1); }
.play-label { font-size: 15px; font-weight: 600; padding: 6px 14px; border-radius: 999px; background: rgb(10 10 26 / .7); border: 1px solid var(--border); }
.shot img { width: 100%; }

/* ─── Facts strip ─────────────────────────────────────────────── */
.facts { padding: 56px 0 28px; }
.facts-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.fact { padding: 22px 20px; border-radius: var(--radius); background: rgb(255 255 255 / .02); border: 1px solid var(--border-soft); text-align: center; }
.fact strong { display: block; font-size: 38px; font-weight: 800; letter-spacing: -0.04em; color: #fff; line-height: 1.1; }
.fact span { display: block; margin-top: 4px; font-size: 14.5px; color: var(--text-2); }

/* ─── Sections ────────────────────────────────────────────────── */
.section { padding: 112px 0; position: relative; }
.section.alt { background: linear-gradient(180deg, var(--bg-2), #0c0d24); border-top: 1px solid rgb(42 45 82 / .6); border-bottom: 1px solid rgb(42 45 82 / .6); }
.section-head { max-width: 760px; margin: 0 auto 56px; text-align: center; }
.kicker { font-size: 13.5px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--primary-400); }
h2 { margin-top: 14px; font-size: clamp(32px, 4.4vw, 52px); font-weight: 800; }
.sub { margin-top: 18px; font-size: 18.5px; color: var(--text-2); }
h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.02em; }
.muted { margin-top: 22px; font-size: 15.5px; color: var(--text-3); display: flex; gap: 10px; align-items: baseline; }
.muted .i { position: relative; top: 3px; color: var(--primary-400); }
.note { margin-top: 18px; font-size: 14.5px; color: var(--text-3); }

.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 64px; align-items: center; }
.split-rev > figure { order: -1; }
.split .sub { max-width: 560px; }

/* Lockout steps */
.steps { display: grid; gap: 14px; }
.step { display: flex; gap: 18px; padding: 22px; border-radius: var(--radius); background: rgb(255 255 255 / .02); border: 1px solid var(--border-soft); }
.step p { margin-top: 6px; color: var(--text-2); font-size: 16px; }
.step-ic { width: 44px; height: 44px; flex-shrink: 0; border-radius: 12px; display: grid; place-items: center; color: var(--primary-300); background: rgb(99 102 241 / .14); border: 1px solid rgb(129 140 248 / .28); }
.step-ic .i { width: 21px; height: 21px; }

.ladder { margin-top: 56px; display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 10px; }
.rung { display: inline-flex; flex-direction: column; align-items: center; min-width: 128px; padding: 14px 18px; border-radius: 14px; background: var(--elevated); border: 1px solid var(--border); font-size: 13.5px; color: var(--text-3); }
.rung b { margin-top: 2px; font-size: 20px; color: var(--warning-400); letter-spacing: -0.02em; }
.rung-end { border-color: rgb(248 113 113 / .45); background: rgb(248 113 113 / .08); }
.rung-end b { color: #fca5a5; }
.arrow { color: var(--text-3); font-size: 20px; }

.two-col { margin-top: 56px; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.card { padding: 28px; border-radius: var(--radius); background: var(--bg-3); border: 1px solid var(--border); }
.card h3 { display: flex; align-items: center; gap: 10px; font-size: 18.5px; }
.card h3 .i { color: var(--primary-400); }
.card p { margin-top: 10px; color: var(--text-2); font-size: 16px; }
.card .muted { margin-top: 16px; }
.card-honest { background: linear-gradient(160deg, rgb(251 146 60 / .07), var(--bg-3) 60%); border-color: rgb(251 146 60 / .28); }
.card-honest h3 .i { color: var(--warning-400); }

.chips { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; }
.chips li { padding: 7px 14px; border-radius: 999px; font-size: 14.5px; color: var(--primary-300); background: rgb(99 102 241 / .1); border: 1px solid rgb(129 140 248 / .26); }
.chips-lang { margin-top: 28px; }
.chips-lang li { font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 14px; font-weight: 600; color: #e0e7ff; }

/* Question types */
.type-list { margin-top: 30px; display: grid; gap: 12px; }
.type-list li { display: flex; gap: 14px; align-items: flex-start; padding: 14px 16px; border-radius: 12px; background: rgb(255 255 255 / .025); border: 1px solid var(--border-soft); }
.type-list .i { margin-top: 3px; color: var(--primary-400); }
.type-list b { display: block; font-weight: 650; }
.type-list span { display: block; font-size: 15px; color: var(--text-2); }

/* Teacher features */
.feature { display: grid; grid-template-columns: 1.35fr 1fr; gap: 56px; align-items: center; }
.feature + .feature { margin-top: 88px; }
.feature-rev > figure { order: 2; }
.feature-title { display: flex; gap: 12px; align-items: flex-start; font-size: 26px; font-weight: 750; letter-spacing: -0.03em; line-height: 1.2; }
.feature-title .i { margin-top: 4px; width: 26px; height: 26px; color: var(--primary-400); }
.bullets { margin-top: 20px; display: grid; gap: 12px; }
.bullets li { position: relative; padding-left: 28px; color: var(--text-2); font-size: 16.5px; }
.bullets li::before { content: ''; position: absolute; left: 4px; top: 10px; width: 8px; height: 8px; border-radius: 50%; background: var(--primary-400); box-shadow: 0 0 0 4px rgb(99 102 241 / .18); }

/* LMS in / out */
.io { margin-top: 30px; display: grid; grid-template-columns: 1.25fr 1fr; gap: 14px; }
.io > div { padding: 20px; border-radius: 14px; background: rgb(255 255 255 / .025); border: 1px solid var(--border-soft); }
.io h3 { display: flex; align-items: center; gap: 8px; font-size: 16.5px; }
.io h3 .i { color: var(--primary-400); }
.io ul { margin-top: 10px; display: grid; gap: 7px; }
.io li { font-size: 15px; color: var(--text-2); padding-left: 16px; position: relative; }
.io li::before { content: '–'; position: absolute; left: 0; color: var(--text-3); }

/* Branding */
.skins { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.skins figure { margin: 0; }
.skins img { border-radius: 12px; border: 1px solid var(--border); box-shadow: 0 30px 60px -30px rgb(0 0 0 / .8); }
.skins figcaption { margin-top: 12px; text-align: center; font-size: 14.5px; color: var(--text-2); }

/* Trust grid */
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

/* FAQ */
.faq { display: grid; gap: 12px; }
.faq details { border-radius: 14px; background: var(--bg-3); border: 1px solid var(--border); }
.faq details[open] { border-color: rgb(129 140 248 / .4); }
.faq summary { cursor: pointer; list-style: none; padding: 20px 56px 20px 24px; font-weight: 600; font-size: 17px; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; position: absolute; right: 22px; top: 50%; transform: translateY(-50%); font-size: 24px; font-weight: 400; color: var(--primary-400); transition: transform .2s; }
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { padding: 0 24px 22px; color: var(--text-2); font-size: 16px; }

/* Demo */
.demo { background: radial-gradient(900px 500px at 20% 30%, rgb(67 56 202 / .28), transparent 70%), var(--bg); }
.demo-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: start; }
.demo-copy { position: sticky; top: calc(var(--header-h) + 40px); }
.demo-copy .bullets { margin-top: 28px; }
.form { padding: 32px; display: grid; gap: 16px; background: rgb(19 21 58 / .85); box-shadow: 0 40px 100px -40px rgb(0 0 0 / .9); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: grid; gap: 7px; font-size: 14.5px; font-weight: 600; color: var(--text-2); }
.field em { font-style: normal; font-weight: 400; color: var(--text-3); }
.field input, .field select, .field textarea {
  width: 100%; min-height: 46px; padding: 11px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: #0b0c22; color: var(--text);
  font: 400 16px/1.4 Inter, sans-serif; transition: border-color .15s, box-shadow .15s;
}
.field textarea { resize: vertical; min-height: 110px; }
.field select { appearance: none; -webkit-appearance: none; padding-right: 38px; background-image: linear-gradient(45deg, transparent 50%, var(--text-3) 50%), linear-gradient(135deg, var(--text-3) 50%, transparent 50%); background-position: calc(100% - 20px) 50%, calc(100% - 15px) 50%; background-size: 5px 5px; background-repeat: no-repeat; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--primary-400); box-shadow: 0 0 0 3px rgb(99 102 241 / .25); }
/* Spam trap. display:none, not off-screen: browsers autofill off-screen fields, which got real requests discarded. */
.hp { display: none; }
.fine { font-size: 13px; color: var(--text-3); text-align: center; }

/* Footer */
.site-footer { padding: 48px 0; border-top: 1px solid var(--border); background: #08081a; }
.footer-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; color: var(--text-3); font-size: 15px; }
.footer-meta { margin-left: auto; }
.footer-meta a { color: var(--text-2); }
.footer-meta a:hover { color: #fff; }

/* Scroll reveal (only when JS is running, and never with reduced motion) */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s cubic-bezier(.2, .7, .2, 1); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .play-disc { transition: none; }
}

/* ─── Responsive ──────────────────────────────────────────────── */
@media (max-width: 1020px) {
  .io { grid-template-columns: 1fr 1fr; }
  .split, .feature, .demo-grid { grid-template-columns: 1fr; gap: 40px; }
  .feature-rev > figure { order: 0; }
  .split-rev > figure { order: 0; }
  .demo-copy { position: static; }
  .grid3 { grid-template-columns: 1fr 1fr; }
  .facts-row { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .nav {
    position: absolute; top: var(--header-h); left: 0; right: 0; flex-direction: column; gap: 0;
    padding: 8px 16px 16px; background: #0a0a1a; border-bottom: 1px solid var(--border); box-shadow: 0 30px 60px rgb(0 0 0 / .6);
    display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 14px 8px; font-size: 17px; border-bottom: 1px solid rgb(42 45 82 / .5); }
  .header-cta { margin-left: auto; }
  .menu-btn { display: grid; }
}
@media (max-width: 680px) {
  body { font-size: 16px; }
  .br-wide { display: none; }
  .wrap { padding: 0 16px; }
  .section { padding: 80px 0; }
  .hero { padding-top: 56px; }
  .video-window { margin-top: 44px; }
  .two-col, .io, .field-row, .skins, .grid3 { grid-template-columns: 1fr; }
  .facts-row { gap: 10px; }
  .fact strong { font-size: 30px; }
  .feature + .feature { margin-top: 64px; }
  .feature-title { font-size: 22px; }
  .arrow { display: none; }
  .rung { min-width: calc(50% - 5px); }
  .rung-end { min-width: 100%; }
  .form { padding: 22px; }
  .footer-meta { margin-left: 0; width: 100%; }
  .header-cta { height: 38px; padding: 0 14px; font-size: 14px; }
  .brand-name { font-size: 18px; }
  .play-disc { width: 64px; height: 64px; }
  .play-disc .i { width: 26px; height: 26px; }
  .play-label { display: none; }
  .play { justify-content: center; padding-bottom: 0; }
}
@media (max-width: 380px) {
  .header-cta { display: none; }
}