/* ========= AIcademy Design System ========= */
:root {
  /* Palette */
  --bg: #07070b;
  --bg-2: #0b0b12;
  --surface: #101019;
  --surface-2: #14141f;
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);
  --text: #f4f4f8;
  --text-dim: #9a9aae;
  --text-muted: #65657a;

  /* Accents */
  --violet: #7c5cff;
  --violet-2: #9b7cff;
  --pink: #ff6ec7;
  --cyan: #4fd0ff;
  --green: #4ade80;

  /* Gradients */
  --grad-text: linear-gradient(90deg, #8a7cff 0%, #b48cff 35%, #c98bff 55%, #7fb8ff 85%, #6ad4ff 100%);
  --grad-cta: linear-gradient(135deg, #7c5cff 0%, #b659ff 50%, #ff5ea8 100%);
  --grad-halo: radial-gradient(60% 60% at 50% 40%, rgba(124, 92, 255, 0.35), transparent 70%);

  /* Radii & shadows */
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --shadow-card: 0 1px 0 rgba(255,255,255,0.03) inset, 0 20px 40px -20px rgba(0,0,0,0.6);
  --shadow-cta: 0 10px 30px -10px rgba(124, 92, 255, 0.55);

  /* Typography */
  --font-display: 'Instrument Serif', 'Times New Roman', serif;
  --font-sans: 'Inter Tight', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

/* Theme: lila (default) */
[data-theme="lila"] {
  --grad-text: linear-gradient(90deg, #8a7cff 0%, #b48cff 35%, #c98bff 55%, #7fb8ff 85%, #6ad4ff 100%);
  --grad-cta: linear-gradient(135deg, #7c5cff 0%, #b659ff 50%, #ff5ea8 100%);
  --violet: #7c5cff;
}
/* Theme: acid */
[data-theme="acid"] {
  --grad-text: linear-gradient(90deg, #d4ff7a 0%, #8af0b4 50%, #4fd0ff 100%);
  --grad-cta: linear-gradient(135deg, #4fd0ff 0%, #8af0b4 50%, #d4ff7a 100%);
  --violet: #4fd0ff;
}
/* Theme: ember */
[data-theme="ember"] {
  --grad-text: linear-gradient(90deg, #ffb06b 0%, #ff6b8e 50%, #c86bff 100%);
  --grad-cta: linear-gradient(135deg, #ff8a4c 0%, #ff4d7e 55%, #b94dff 100%);
  --violet: #ff6b8e;
}

/* Density */
[data-density="cozy"] { --section-pad: 120px; }
[data-density="compact"] { --section-pad: 72px; }

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
}
.section {
  padding: var(--section-pad, 120px) 0;
  position: relative;
  scroll-margin-top: 80px;
}
section[id] { scroll-margin-top: 80px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(124, 92, 255, 0.12);
  border: 1px solid rgba(124, 92, 255, 0.25);
  color: #cdbcff;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--violet);
  box-shadow: 0 0 10px var(--violet);
}

.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.h-display {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(42px, 6.5vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  margin: 0;
}
.h-section {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  text-align: center;
}
.section-sub {
  color: var(--text-dim);
  text-align: center;
  max-width: 620px;
  margin: 0 auto 56px;
  font-size: 17px;
  line-height: 1.55;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: 14px;
  font-weight: 600;
  font-size: 15px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad-cta);
  color: white;
  box-shadow: var(--shadow-cta);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px -10px rgba(124, 92, 255, 0.7);
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-strong);
  color: var(--text);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
}

/* Card base */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 24px;
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}
.card:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
}

/* Icon chip */
.chip-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(124,92,255,0.25), rgba(124,92,255,0.1));
  border: 1px solid rgba(124, 92, 255, 0.3);
  display: grid;
  place-items: center;
  color: #cdbcff;
  flex-shrink: 0;
}

/* Tag pills */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.tag-violet { background: rgba(124,92,255,0.15); color: #b6a0ff; border: 1px solid rgba(124,92,255,0.25); }
.tag-green  { background: rgba(74,222,128,0.12); color: #86efac; border: 1px solid rgba(74,222,128,0.25); }
.tag-pink   { background: rgba(255,110,199,0.12); color: #ffa8db; border: 1px solid rgba(255,110,199,0.25); }
.tag-blue   { background: rgba(79,208,255,0.12); color: #93dcff; border: 1px solid rgba(79,208,255,0.25); }

.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
  margin: 0;
  border: none;
}

/* Background ambient */
.ambient {
  position: absolute;
  pointer-events: none;
  filter: blur(80px);
  opacity: 0.5;
  z-index: 0;
}

/* Reveal on scroll — content is visible by default; class only adds a subtle lift when it enters */
.reveal {
  opacity: 1;
  transform: none;
  transition: opacity 0.8s ease, transform 0.8s ease;
}
[data-animations="on"] .reveal:not(.is-visible) {
  opacity: 0;
  transform: translateY(24px);
}

/* Checkbox bullet */
.check-bullet {
  display: inline-flex;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: rgba(74,222,128,0.15);
  color: #86efac;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 3px;
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #1a1a2a; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #252538; }

/* Selection */
::selection { background: rgba(124,92,255,0.4); color: white; }

/* Header logo — animated star between violet & pink */
.logo-svg svg {
  height: 28px;
  width: auto;
  display: block;
}
.logo-svg .star {
  animation: logoStarColor 3s ease-in-out infinite;
}
@keyframes logoStarColor {
  0%, 100% { fill: #7c5cff; }
  50%      { fill: #ff5ea8; }
}

/* Tweaks panel */
.tweaks-fab {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 80;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--grad-cta);
  display: grid;
  place-items: center;
  color: white;
  box-shadow: var(--shadow-cta);
  transition: transform 0.2s ease;
}
.tweaks-fab:hover { transform: scale(1.05); }

.tweaks-panel {
  position: fixed;
  right: 20px;
  bottom: 80px;
  z-index: 81;
  width: 280px;
  background: #0d0d18;
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 30px 80px -20px rgba(0,0,0,0.8);
}
.tweak-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 8px 0; }
.tweak-row label { font-size: 13px; color: var(--text-dim); }
.tweak-swatches { display: flex; gap: 6px; }
.tweak-sw {
  width: 24px; height: 24px; border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: border-color 0.15s;
}
.tweak-sw.active { border-color: white; }
.tweak-pill {
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  cursor: pointer;
}
.tweak-pill.active { background: var(--violet); border-color: var(--violet); color: white; }

/* ---- Header responsive (no hamburger; logo + lang + CTA stay on one bar) ---- */
@media (max-width: 560px) {
  .site-header .container { padding: 12px 16px !important; }
  .logo-svg svg { height: 26px; width: auto; }
  .header-actions { gap: 8px !important; }
  .header-actions .btn-primary { padding: 9px 7px !important; }
}
@media (max-width: 360px) {
  .header-actions .btn-primary { padding: 9px 6px !important; font-size: 13px !important; }
}