/* =========================================================
   AI for Everyone: site styles
   Colour tokens live in :root; change them to re-theme the site.
   ========================================================= */

:root {
  --bg: #f4f6fb;
  --section-alt: #eaedf7;
  --card: #ffffff;
  --text: #1d2433;
  --muted: #5b6475;
  --border: #d9deea;
  --accent: #4f46e5;
  --accent-soft: #e6e5fc;
  --accent-text: #ffffff;
  --correct: #15803d;
  --correct-bg: #e7f6ec;
  --wrong: #b91c1c;
  --wrong-bg: #fdecec;
  --track: #e5e8f0;
  --shadow: 0 10px 30px rgba(20, 30, 60, 0.08);
  --hero: linear-gradient(135deg, #eef0ff 0%, #f7f0ff 50%, #eaf6ff 100%);
  --header-bg: rgba(255, 255, 255, 0.85);
  --max: 1080px;
  --header-h: 64px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f131c;
    --section-alt: #131926;
    --card: #181e2b;
    --text: #e8ecf4;
    --muted: #a2abbd;
    --border: #2c3446;
    --accent: #818cf8;
    --accent-soft: #23284a;
    --accent-text: #0f131c;
    --correct: #4ade80;
    --correct-bg: #13301f;
    --wrong: #f87171;
    --wrong-bg: #3a1a1a;
    --track: #2c3446;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    --hero: linear-gradient(135deg, #161a33 0%, #1c1630 50%, #10202e 100%);
    --header-bg: rgba(15, 19, 28, 0.85);
  }
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3 { line-height: 1.25; }
p { margin: 0 0 16px; color: var(--muted); }
a { color: var(--accent); }

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 16px;
}

.hidden { display: none !important; }

/* Skip link for keyboard users */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  background: var(--accent);
  color: var(--accent-text);
  padding: 8px 14px;
  border-radius: 8px;
  z-index: 100;
}
.skip-link:focus { left: 16px; }

/* Visible focus everywhere */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Header + nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.logo {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}
.nav-links a:hover { background: var(--accent-soft); }

.menu-toggle {
  display: none;
  font: inherit;
  font-size: 1.4rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  width: 44px;
  height: 44px;
  cursor: pointer;
}

@media (max-width: 720px) {
  .menu-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 8px 16px 16px;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px; }
}

/* ---------- Sections ---------- */
section[id] { scroll-margin-top: var(--header-h); }

.section { padding: 72px 0; }
.section.alt { background: var(--section-alt); }

.section-head {
  max-width: 640px;
  margin: 0 auto 40px;
  text-align: center;
}
.section-head h2 { font-size: 2rem; margin: 0 0 12px; }
.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

/* ---------- Hero ---------- */
.hero {
  background: var(--hero);
  padding: 96px 0 88px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  max-width: 760px;
  margin: 0 auto 16px;
}
.hero p {
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto 32px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font: inherit;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  border: 2px solid var(--accent);
  border-radius: 12px;
  padding: 12px 24px;
  min-height: 48px;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { filter: brightness(1.08); }
.btn-outline {
  background: transparent;
  color: var(--accent);
}
.btn-outline:hover { background: var(--accent-soft); filter: none; }

/* ---------- Card grids (explainer, tips, resources) ---------- */
.grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.info-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
}
.info-card h3 { margin: 12px 0 8px; font-size: 1.15rem; }
.info-card p { margin: 0; }

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-soft);
  font-size: 1.5rem;
}

/* Stay-safe tips list */
.tips {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 760px;
  display: grid;
  gap: 14px;
}
.tips li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
}
.tips h3 { margin: 0 0 4px; font-size: 1.05rem; }
.tips p { margin: 0; }
.tips .icon { flex-shrink: 0; }

/* Resource cards */
.resource {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s, border-color 0.15s;
}
.resource:hover { transform: translateY(-3px); border-color: var(--accent); }
.resource .tag {
  align-self: flex-start;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
}
.resource .go {
  margin-top: auto;
  padding-top: 16px;
  font-weight: 600;
  color: var(--accent);
}

/* ---------- Quiz (carried over from the standalone quiz) ---------- */
.quiz-card {
  max-width: 620px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 28px;
}
.quiz-card h2 { margin: 0 0 20px; font-size: 1.3rem; }
.quiz-card h3 { margin: 0 0 8px; font-size: 1.5rem; }

.progress-label {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 8px;
}
.progress-track {
  height: 8px;
  background: var(--track);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 24px;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.3s ease;
}

.options { display: grid; gap: 10px; }

/* Label on questions written by the local AI model */
.ai-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}
.pool-note { font-size: 0.9rem; }
.pool-note:empty { display: none; }

.option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  text-align: left;
  font: inherit;
  color: var(--text);
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  min-height: 52px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.option:hover:not(:disabled) { border-color: var(--accent); }
.option:disabled { cursor: default; }
.option.correct { border-color: var(--correct); background: var(--correct-bg); }
.option.wrong   { border-color: var(--wrong);   background: var(--wrong-bg); }
.option .mark   { font-weight: 700; flex-shrink: 0; }
.option.correct .mark { color: var(--correct); }
.option.wrong .mark   { color: var(--wrong); }

.feedback {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 12px;
  border-left: 5px solid var(--border);
  background: var(--bg);
}
.feedback.correct { border-left-color: var(--correct); }
.feedback.wrong   { border-left-color: var(--wrong); }
.feedback strong  { display: block; margin-bottom: 4px; }
.feedback.correct strong { color: var(--correct); }
.feedback.wrong strong   { color: var(--wrong); }
.feedback span { color: var(--text); }

.quiz-card .btn { margin-top: 20px; }

.score {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent);
  margin: 8px 0;
}
.review { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 10px; }
.review li {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.95rem;
}
.review .q { font-weight: 600; display: block; margin-bottom: 4px; }
.review .ok  { color: var(--correct); }
.review .bad { color: var(--wrong); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  font-size: 0.95rem;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.site-footer p { margin: 0; }

/* ---------- Small screens ---------- */
@media (max-width: 480px) {
  .section { padding: 56px 0; }
  .hero { padding: 64px 0 56px; }
  .section-head h2 { font-size: 1.6rem; }
  .quiz-card { padding: 20px; }
  .hero-actions .btn,
  .quiz-card .btn { width: 100%; }
}