/* AduTech brand tokens + shared base + landing page. Demo-only styles live in demo.css. */
:root {
  --ink: #172033;
  --ink-2: #2B3650;
  --slate: #4A5568;
  --muted: #6B7587;
  --paper: #F7F8FA;
  --card: #FFFFFF;
  --line: #DDE2EA;
  --line-2: #EBEEF3;
  --pencil: #F5B800;
  --pencil-ink: #3A2C00;
  --pencil-soft: #FFF3C4;
  --go: #1E8C6E;
  --go-soft: #DDF3EC;
  --stop: #C2412D;
  --stop-soft: #FBE3DE;
  --wait: #A86A00;
  --wait-soft: #FCEFD3;
  --info: #2F5FB3;
  --info-soft: #E2EBFA;
  --display: "Lexend", "Figtree", system-ui, sans-serif;
  --body: "Figtree", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --r-s: 6px;
  --r-m: 10px;
  --r-l: 18px;
  --shadow: 0 1px 2px rgba(23, 32, 51, .06), 0 8px 24px rgba(23, 32, 51, .08);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.55 var(--body);
}
h1, h2, h3, h4 { font-family: var(--display); font-weight: 600; line-height: 1.15; margin: 0 0 .5em; letter-spacing: -0.02em; }
p { margin: 0 0 1em; }
a { color: var(--info); }
img, svg { max-width: 100%; }
:focus-visible { outline: 3px solid var(--pencil); outline-offset: 2px; border-radius: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.muted { color: var(--muted); }

/* Buttons (shared by landing, demo frame and every fake app) */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .45em;
  font: 600 15px/1 var(--body);
  padding: .7em 1.1em;
  border-radius: var(--r-s);
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { border-color: #C3CAD6; background: #FBFCFD; }
.btn.primary { background: var(--ink); border-color: var(--ink); color: #fff; }
.btn.primary:hover { background: var(--ink-2); }
.btn.accent { background: var(--pencil); border-color: var(--pencil); color: var(--pencil-ink); }
.btn.accent:hover { background: #FFC81F; }
.btn.go { background: var(--go); border-color: var(--go); color: #fff; }
.btn.danger { background: var(--stop); border-color: var(--stop); color: #fff; }
.btn.ghost { background: transparent; }
.btn.small { font-size: 13px; padding: .5em .8em; }
.btn.block { display: flex; width: 100%; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }

/* ---------- Landing page ---------- */
.site-head {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  max-width: 1160px; margin: 0 auto; padding: 20px 24px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font: 700 20px/1 var(--display); color: var(--ink); text-decoration: none; }
.brand-mark {
  display: grid; place-items: center; width: 32px; height: 32px; border-radius: 8px;
  background: var(--pencil); color: var(--pencil-ink); font: 800 18px/1 var(--display);
}
.site-nav { display: flex; gap: 22px; align-items: center; }
.site-nav a { color: var(--slate); text-decoration: none; font-weight: 600; font-size: 15px; }
.site-nav a:hover { color: var(--ink); }

.hero {
  max-width: 1160px; margin: 0 auto; padding: 40px 24px 72px;
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center;
}
.hero h1 { font-size: clamp(36px, 5vw, 58px); font-weight: 700; letter-spacing: -0.035em; line-height: 1.08; margin-bottom: .4em; }
.hero-lede { font-size: 19px; color: var(--slate); max-width: 34em; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }

/* Hero sample: a short RapidRecall quiz the visitor can play */
.sampler {
  background: var(--ink); color: #fff; border-radius: var(--r-l); padding: 22px;
  box-shadow: 0 30px 60px -20px rgba(23, 32, 51, .45);
}
.sampler-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; font-size: 14px; color: #B9C2D3; }
.sampler-head strong { color: #fff; font-family: var(--display); font-weight: 600; font-size: 16px; }
.sampler-dots { display: flex; gap: 6px; margin: 14px 0 16px; }
.sampler-dots i { flex: 1; height: 6px; border-radius: 99px; background: #2B3650; transition: background .3s ease; }
.sampler-dots i.half { background: #8A7330; }
.sampler-dots i.full { background: var(--pencil); }
.sampler-card {
  background: #fff; color: var(--ink); border-radius: var(--r-m); padding: 22px 20px; min-height: 150px;
  display: grid; place-items: center; text-align: center;
}
.sampler-card .pic { font-size: 40px; line-height: 1; }
.sampler-card p { margin: 10px 0 0; font-size: 19px; line-height: 1.4; }
.sampler-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 12px; }
.sampler-options .btn { white-space: normal; padding: .8em .5em; background: #24304A; border-color: #34425F; color: #fff; }
.sampler-options .btn:hover:not([disabled]) { background: #2E3B58; }
.sampler-options .btn.right { background: var(--go); border-color: var(--go); opacity: 1; }
.sampler-options .btn.wrong { background: var(--stop); border-color: var(--stop); opacity: 1; }
.sampler-feedback { min-height: 48px; margin: 12px 0 0; font-size: 14px; color: #D5DBE6; display: flex; gap: 12px; align-items: center; justify-content: space-between; }
.sampler-feedback i { color: #B9C2D3; }
.sampler-note { font-size: 13px; color: #8D9AB3; margin: 8px 0 0; }
@media (max-width: 480px) { .sampler-options { grid-template-columns: 1fr; } }

.section { max-width: 1160px; margin: 0 auto; padding: 72px 24px; }
.section-head { max-width: 640px; margin-bottom: 40px; }
.section-head h2 { font-size: clamp(28px, 3.4vw, 40px); letter-spacing: -0.02em; }
.section-head p { color: var(--slate); font-size: 18px; }

.group { display: grid; grid-template-columns: 240px 1fr; gap: 40px; padding: 36px 0; border-top: 2px solid var(--ink); }
.group-label h3 { font-size: 22px; margin-bottom: 6px; }
.group-label p { color: var(--muted); font-size: 15px; }
.product { display: grid; grid-template-columns: 1fr auto; gap: 8px 32px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.product:first-child { padding-top: 0; }
.product:last-child { border-bottom: 0; }
.product h4 { font-size: 24px; margin: 0; }
.product .tagline { font-size: 17px; color: var(--ink-2); margin: 4px 0 10px; }
.product .who { font-size: 14px; color: var(--muted); margin: 0 0 12px; }
.product ul { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 6px 24px; font-size: 15px; color: var(--slate); }
.product li { padding-left: 18px; position: relative; }
.product li::before { content: ""; position: absolute; left: 0; top: .62em; width: 8px; height: 8px; border-radius: 2px; background: var(--pencil); }
.product .cta { grid-row: 1 / span 2; grid-column: 2; align-self: start; }

.how { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.how-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.how-grid h3 { font-size: 19px; }
.how-grid p { color: var(--slate); font-size: 15px; }
.step-n { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--ink); color: #fff; font: 700 15px/1 var(--display); margin-bottom: 12px; }

.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact form { background: var(--card); border: 1px solid var(--line); border-radius: var(--r-l); padding: 24px; display: grid; gap: 14px; }
.contact label { display: grid; gap: 6px; font-weight: 600; font-size: 14px; }
.contact input, .contact select, .contact textarea {
  font: 15px/1.4 var(--body); padding: 10px 12px; border: 1px solid var(--line); border-radius: var(--r-s); background: #fff; color: var(--ink);
}
.contact .checks { display: flex; flex-wrap: wrap; gap: 8px; }
.contact .checks label { display: inline-flex; align-items: center; gap: 6px; font-weight: 500; border: 1px solid var(--line); border-radius: 99px; padding: 5px 12px; }
.form-done { background: var(--go-soft); color: #0F5A45; border-radius: var(--r-m); padding: 14px 16px; font-weight: 600; }
.form-error { background: var(--stop-soft); color: #8A2A1B; border-radius: var(--r-m); padding: 12px 16px; font-size: 14px; }
#contact-status:empty { display: none; }

/* Full feature list page (features.html) */
.feat-head { padding-top: 24px; padding-bottom: 32px; }
.feat-switch { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 36px; }
.feat-switch a { padding: 6px 12px; border: 1px solid var(--line); border-radius: 99px; background: var(--card); color: var(--slate); font-size: 14px; font-weight: 600; text-decoration: none; }
.feat-switch a:hover { border-color: #C3CAD6; color: var(--ink); }
.feat-switch a[aria-current="page"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.feat-title { font-size: clamp(36px, 5vw, 56px); font-weight: 700; letter-spacing: -0.035em; margin-bottom: .2em; }
.feat-tagline { font-size: 21px; color: var(--ink-2); max-width: 34em; margin-bottom: 8px; }
.feat-meta { color: var(--muted); font-size: 15px; }
.feat-body { padding-top: 0; }
.feat-body .group-label h2 { font-size: 22px; margin-bottom: 6px; }
.feat-list { margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 24px 40px; }
.feat-item dt { font: 600 17px/1.3 var(--display); letter-spacing: -0.01em; margin-bottom: 4px; }
.feat-item dd { margin: 0; color: var(--slate); font-size: 15px; }
.feat-try { white-space: nowrap; font-weight: 600; font-size: 14px; }
.feat-more { margin-top: 24px; padding: 28px; border-radius: var(--r-l); background: var(--pencil-soft); max-width: 720px; }
.feat-more h2 { font-size: 24px; }
.feat-more p { color: var(--ink-2); }
.product .more { margin: 12px 0 0; font-size: 14px; font-weight: 600; }

.site-foot { max-width: 1160px; margin: 0 auto; padding: 32px 24px 48px; color: var(--muted); font-size: 14px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; border-top: 1px solid var(--line); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 16px; }
  .group { grid-template-columns: 1fr; gap: 16px; }
  .how-grid, .contact { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .site-head { padding: 16px; }
  .site-nav a:not(.btn) { display: none; }
  .hero, .section { padding-left: 16px; padding-right: 16px; }
  .section { padding-top: 48px; padding-bottom: 48px; }
  .product { grid-template-columns: 1fr; }
  .product .cta { grid-row: auto; grid-column: 1; justify-self: start; margin-top: 8px; }
  .product ul { grid-template-columns: 1fr; }
  .feat-list { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}