/* Front page (index.html) only. Builds on the tokens in styles.css; the vivid --f-* hues are mixed with
   --surface / --bg so the same colours work in light and dark themes. */

:root {
  --f-blue: #3b6cf6; --f-purple: #8b5cf6; --f-pink: #ec4899; --f-orange: #f97316;
  --f-teal: #14b8a6; --f-red: #ef4444; --f-amber: #f59e0b; --f-lime: #84cc16; --f-green: #22c55e;
  --f-grad: linear-gradient(100deg, #3b6cf6 0%, #8b5cf6 45%, #ec4899 100%);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --f-blue: #7c9cff; --f-purple: #b197fc; --f-pink: #f472b6; --f-orange: #fb923c; --f-teal: #2dd4bf;
    --f-grad: linear-gradient(100deg, #7c9cff 0%, #b197fc 45%, #f472b6 100%);
  }
}
:root[data-theme="dark"] {
  --f-blue: #7c9cff; --f-purple: #b197fc; --f-pink: #f472b6; --f-orange: #fb923c; --f-teal: #2dd4bf;
  --f-grad: linear-gradient(100deg, #7c9cff 0%, #b197fc 45%, #f472b6 100%);
}

.front { overflow-x: hidden; }
.wrap-wide { max-width: 1140px; margin: 0 auto; padding: 0 20px; }
.front h1, .front h2, .front h3 { letter-spacing: -.02em; }

/* ---------- header ---------- */
.front-header {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--bg) 78%, transparent); backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
}
.front-nav { display: flex; align-items: center; gap: 20px; min-height: 64px; }
.front-nav .brand { font-size: 1.1rem; }
.front .brand-mark { background: var(--f-grad); }
.front-links { display: flex; gap: 22px; margin-left: auto; }
.front-links a { color: var(--muted); text-decoration: none; font-weight: 600; font-size: .95rem; }
.front-links a:hover { color: var(--ink); }
@media (max-width: 720px) { .front-links { display: none; } .front-nav .f-btn { margin-left: auto; } }

/* ---------- buttons ---------- */
.f-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 24px; border-radius: 999px; font-weight: 700; font-size: 1rem; text-decoration: none;
  transition: transform .15s ease, box-shadow .15s ease;
}
.f-btn:hover { transform: translateY(-2px); }
.f-btn-primary {
  background: var(--f-grad); color: #fff;
  box-shadow: 0 8px 24px -8px color-mix(in srgb, var(--f-purple) 70%, transparent);
}
.f-btn-primary:hover { box-shadow: 0 12px 28px -8px color-mix(in srgb, var(--f-purple) 80%, transparent); }
.f-btn-ghost { background: var(--surface); color: var(--ink); border: 1px solid var(--line); }
.f-btn-sm { padding: 9px 18px; font-size: .92rem; }

/* ---------- hero ---------- */
.f-hero { position: relative; padding: 72px 0 56px; isolation: isolate; overflow-x: clip; }
.blob { position: absolute; z-index: -1; border-radius: 50%; filter: blur(60px); opacity: .45; }
.b1 { width: 520px; height: 520px; background: var(--f-purple); top: -160px; right: -120px; opacity: .35; }
.b2 { width: 420px; height: 420px; background: var(--f-teal); bottom: -140px; left: -160px; opacity: .3; }
.b3 { width: 300px; height: 300px; background: var(--f-pink); top: 40%; right: 30%; opacity: .22; }
.f-hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; }
.f-eyebrow {
  display: inline-block; padding: 6px 14px; border-radius: 999px; font-size: .8rem; font-weight: 700;
  background: color-mix(in srgb, var(--f-purple) 14%, var(--surface)); color: var(--f-purple);
  border: 1px solid color-mix(in srgb, var(--f-purple) 30%, transparent);
}
.f-hero h1 { font-size: clamp(2.4rem, 6vw, 4rem); line-height: 1.04; margin: 18px 0 18px; }
.f-grad { background: var(--f-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.f-lede { font-size: 1.2rem; line-height: 1.55; color: var(--muted); max-width: 34em; margin: 0 0 28px; }
.f-lede b { color: var(--ink); }
.f-cta { display: flex; flex-wrap: wrap; gap: 12px; }
.f-stats { list-style: none; padding: 0; margin: 36px 0 0; display: flex; flex-wrap: wrap; gap: 28px; }
.f-stats li { display: flex; flex-direction: column; }
.f-stats b { font-size: 1.7rem; line-height: 1.1; }
.f-stats li:nth-child(1) b { color: var(--f-blue); }
.f-stats li:nth-child(2) b { color: var(--f-purple); }
.f-stats li:nth-child(3) b { color: var(--f-pink); }
.f-stats li:nth-child(4) b { color: var(--f-orange); }
.f-stats span { color: var(--muted); font-size: .88rem; }

/* hero illustration */
.f-hero-art { position: relative; min-height: 500px; }
.art-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 18px 20px;
  box-shadow: 0 24px 60px -24px rgba(30, 20, 80, .35);
}
.art-progress { position: absolute; top: 0; left: 0; width: 74%; transform: rotate(-2.5deg); }
.art-exam { position: absolute; bottom: 0; right: 0; width: 82%; transform: rotate(1.5deg); }
.art-head { font-weight: 700; font-size: .92rem; display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.art-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--c); }
.art-row { display: flex; gap: 18px; align-items: center; }
.art-ring { position: relative; width: 92px; height: 92px; flex: none; display: grid; place-items: center; }
.art-ring svg { position: absolute; inset: 0; transform: rotate(-90deg); }
.art-ring circle { fill: none; stroke-width: 4; }
.ring-bg { stroke: var(--surface-2); }
.ring-fg { stroke: var(--f-green); stroke-linecap: round; }
.art-ring b { font-size: 1.25rem; }
.art-heat { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; flex: 1; max-width: 230px; }
.art-heat i { aspect-ratio: 1; border-radius: 6px; background: var(--h); }
.art-heat i.empty { background: var(--surface-2); }
.art-legend { display: flex; gap: 14px; margin-top: 12px; font-size: .75rem; color: var(--muted); flex-wrap: wrap; }
.art-legend span::before { content: ""; display: inline-block; width: 9px; height: 9px; border-radius: 3px; background: var(--c); margin-right: 5px; }
.art-q { font-size: .92rem; margin-bottom: 10px; }
.art-marks { color: var(--muted); font-weight: 700; font-size: .8rem; white-space: nowrap; }
.art-ticks { list-style: none; padding: 10px 12px; margin: 0 0 10px; border-radius: 12px; background: var(--warn-soft); font-size: .86rem; }
.art-ticks li { display: flex; gap: 8px; align-items: center; margin: 4px 0; }
.art-ticks li::before {
  content: ""; width: 15px; height: 15px; border-radius: 4px; flex: none; border: 2px solid var(--muted);
}
.art-ticks li.on::before { background: var(--f-green) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3.5 8.5l3 3 6-7' fill='none' stroke='white' stroke-width='2.4' stroke-linecap='round'/%3E%3C/svg%3E") center/contain; border-color: var(--f-green); }
.art-score { font-size: .85rem; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.art-book { margin-left: auto; padding: 3px 10px; border-radius: 999px; font-weight: 700; font-size: .78rem;
  background: color-mix(in srgb, var(--f-blue) 15%, var(--surface)); color: var(--f-blue); }
.art-sticker {
  position: absolute; top: 44%; right: -6px; padding: 8px 14px; border-radius: 999px; font-weight: 800; font-size: .9rem;
  background: var(--f-orange); color: #fff; transform: rotate(6deg); box-shadow: 0 10px 24px -10px var(--f-orange);
}

@media (max-width: 900px) {
  .f-hero { padding-top: 40px; }
  .f-hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .f-hero-art { min-height: 470px; max-width: 520px; width: 100%; margin: 0 auto; }
}
@media (max-width: 480px) {
  .art-progress { width: 92%; } .art-exam { width: 94%; }
  .art-ring { width: 72px; height: 72px; }
  .art-sticker { display: none; }
}

/* ---------- boards strip ---------- */
.f-boards { display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: center; justify-content: center; padding-top: 8px; padding-bottom: 8px; }
.f-boards span { color: var(--muted); font-weight: 600; }
.f-boards b {
  padding: 8px 18px; border-radius: 999px; font-size: 1rem;
  color: var(--c); background: color-mix(in srgb, var(--c) 13%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--c) 30%, transparent);
}

/* ---------- sections ---------- */
.f-section { padding-top: 80px; scroll-margin-top: 64px; }
.f-section-head { text-align: center; max-width: 640px; margin: 0 auto 40px; }
.f-section h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.12; margin: 12px 0; }
.f-section-head p, .f-show-copy p { color: var(--muted); font-size: 1.1rem; line-height: 1.55; margin: 0; }
.f-kicker {
  display: inline-block; font-size: .8rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; color: var(--c);
}

/* features */
.f-features { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; }
.f-feature {
  position: relative; overflow: hidden; padding: 26px; border-radius: 22px;
  background: linear-gradient(160deg, color-mix(in srgb, var(--c) 12%, var(--surface)) 0%, var(--surface) 60%);
  border: 1px solid color-mix(in srgb, var(--c) 22%, var(--line));
  transition: transform .2s ease, box-shadow .2s ease;
}
.f-feature:hover { transform: translateY(-4px); box-shadow: 0 18px 40px -20px color-mix(in srgb, var(--c) 60%, transparent); }
.f-icon {
  width: 52px; height: 52px; border-radius: 16px; display: grid; place-items: center; background: var(--c);
  box-shadow: 0 10px 20px -10px var(--c);
}
.f-icon svg, .f-course-icon svg { width: 26px; height: 26px; fill: none; stroke: #fff; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.f-feature h3 { margin: 18px 0 8px; font-size: 1.25rem; }
.f-feature p { margin: 0; color: var(--muted); line-height: 1.55; }

/* showcase */
.f-show { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.f-show-copy h2 { margin-top: 12px; }
.f-checks { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 12px; }
.f-checks li { display: flex; gap: 12px; align-items: flex-start; font-weight: 600; }
.f-checks li::before {
  content: "✓"; flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
  background: color-mix(in srgb, var(--f-green) 18%, var(--surface)); color: var(--f-green); font-weight: 900; font-size: .85rem;
}
.f-show-art {
  padding: 40px; border-radius: 28px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--f-teal) 25%, var(--bg)), color-mix(in srgb, var(--f-blue) 22%, var(--bg)));
}
.art-quiz { transform: rotate(-1.5deg); }
.art-quiz .art-q { font-weight: 700; font-size: 1.05rem; }
.art-opt { padding: 11px 14px; border: 1px solid var(--line); border-radius: 12px; margin: 8px 0; font-size: .95rem; }
.art-opt.good { border-color: var(--f-green); background: color-mix(in srgb, var(--f-green) 14%, var(--surface)); font-weight: 700; }
.art-why { margin-top: 12px; padding: 12px 14px; border-radius: 12px; font-size: .9rem; background: var(--good-soft); }
@media (max-width: 860px) { .f-show { grid-template-columns: 1fr; gap: 32px; } .f-show-art { padding: 24px; } }

/* courses */
.f-courses { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.f-course {
  display: flex; flex-direction: column; gap: 6px; padding: 22px; border-radius: 22px; text-decoration: none; color: var(--ink);
  background: var(--surface); border: 1px solid var(--line); border-top: 5px solid var(--c);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.f-course:hover { transform: translateY(-4px); border-color: var(--c); box-shadow: 0 18px 40px -22px var(--c); }
.f-course-icon { width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center; background: var(--c); margin-bottom: 8px; }
.f-course-icon svg { width: 24px; height: 24px; }
.f-course-tag { font-size: .76rem; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; color: var(--c); }
.f-course h3 { margin: 0; font-size: 1.3rem; }
.f-course p { margin: 0; color: var(--muted); font-size: .9rem; flex: 1; }
.f-course-count { margin-top: 10px; font-weight: 800; color: var(--c); }

/* coming soon */
.f-soon {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: 36px; align-items: center;
  padding: 48px; border-radius: 32px; color: #fff;
  background: linear-gradient(125deg, #3b3fd8 0%, #7c3aed 45%, #db2777 100%);
  box-shadow: 0 30px 60px -30px rgba(91, 33, 182, .6);
}
.f-soon h2 { color: #fff; margin: 10px 0 12px; }
.f-soon p { color: rgba(255,255,255,.85); font-size: 1.1rem; line-height: 1.55; margin: 0; }
.f-kicker.light { color: #fde68a; }
.f-soon-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.f-soon-grid div {
  display: flex; flex-direction: column; gap: 4px; padding: 18px; border-radius: 18px;
  background: rgba(255,255,255,.13); border: 1px solid rgba(255,255,255,.22); backdrop-filter: blur(4px);
}
.f-soon-grid span { font-size: 1.6rem; }
.f-soon-grid b { font-size: 1.05rem; }
.f-soon-grid small { color: rgba(255,255,255,.8); font-size: .86rem; line-height: 1.4; }
@media (max-width: 860px) { .f-soon { grid-template-columns: 1fr; padding: 30px 22px; } }
@media (max-width: 420px) { .f-soon-grid { grid-template-columns: 1fr; } }

/* final CTA + footer */
.f-final { text-align: center; padding-bottom: 40px; }
.f-final p { color: var(--muted); font-size: 1.1rem; margin: 0 0 24px; }
.f-foot { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px;
  padding-top: 28px; padding-bottom: 40px; border-top: 1px solid var(--line); margin-top: 40px; }

@media (prefers-reduced-motion: reduce) { .f-btn, .f-feature, .f-course { transition: none; } }
@media (max-width: 480px) { .f-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; } }
.f-btn-light { background: #fff; color: #5b21b6; margin-top: 22px; box-shadow: 0 10px 24px -12px rgba(0,0,0,.4); }
.f-soon-grid b em { font-style: normal; font-size: .7rem; font-weight: 800; text-transform: uppercase; letter-spacing: .05em;
  background: rgba(255,255,255,.22); padding: 2px 7px; border-radius: 999px; margin-left: 4px; vertical-align: 2px; }