/* ============================================================
   Helix — Landing Themes
   Swappable appearance for the landing page. Each theme overrides
   semantic tokens (colors/accent), the hero canvas hue, and — for a
   couple — layout/animation flavor. Applied via :root[data-theme].
   The switcher UI + persistence lives in theme-switcher.js.
   ============================================================ */

:root {
  /* Hero canvas reads these (see hero-canvas.js). Default = nebula purple. */
  --hero-hue: 258;
  --hero-sat: 65;
}

/* ── Emerald ─────────────────────────────────────────────────────────── */
:root[data-theme="emerald"] {
  --color-accent: #10b981; --color-accent-hover: #34d399; --color-accent-2: #6ee7b7;
  --color-accent-rgb: 16, 185, 129;
  --color-accent-glow: rgba(16, 185, 129, 0.16);
  --color-accent-bg: rgba(16, 185, 129, 0.08);
  --hero-hue: 158; --hero-sat: 62;
}

/* ── Sunset ──────────────────────────────────────────────────────────── */
:root[data-theme="sunset"] {
  --color-accent: #fb7185; --color-accent-hover: #fda4af; --color-accent-2: #fdba74;
  --color-accent-rgb: 251, 113, 133;
  --color-accent-glow: rgba(251, 146, 96, 0.18);
  --color-accent-bg: rgba(251, 113, 133, 0.08);
  --hero-hue: 18; --hero-sat: 78;
}

/* ── Ocean ───────────────────────────────────────────────────────────── */
:root[data-theme="ocean"] {
  --color-accent: #38bdf8; --color-accent-hover: #7dd3fc; --color-accent-2: #67e8f9;
  --color-accent-rgb: 56, 189, 248;
  --color-accent-glow: rgba(56, 189, 248, 0.16);
  --color-accent-bg: rgba(56, 189, 248, 0.08);
  --hero-hue: 200; --hero-sat: 70;
}

/* ── Rose ────────────────────────────────────────────────────────────── */
:root[data-theme="rose"] {
  --color-accent: #ec4899; --color-accent-hover: #f472b6; --color-accent-2: #d8b4fe;
  --color-accent-rgb: 236, 72, 153;
  --color-accent-glow: rgba(236, 72, 153, 0.16);
  --color-accent-bg: rgba(236, 72, 153, 0.08);
  --hero-hue: 322; --hero-sat: 68;
}

/* ── Gold ────────────────────────────────────────────────────────────── */
:root[data-theme="gold"] {
  --color-accent: #f5b638; --color-accent-hover: #fcd34d; --color-accent-2: #fde68a;
  --color-accent-rgb: 245, 182, 56;
  --color-accent-glow: rgba(245, 182, 56, 0.16);
  --color-accent-bg: rgba(245, 182, 56, 0.08);
  --hero-hue: 42; --hero-sat: 75;
}

/* ── Mono — minimal, sharp, quiet (layout + animation change) ────────── */
:root[data-theme="mono"] {
  --color-accent: #d4d4d8; --color-accent-hover: #ffffff; --color-accent-2: #a1a1aa;
  --color-accent-rgb: 212, 212, 216;
  --color-accent-glow: rgba(255, 255, 255, 0.06);
  --color-accent-bg: rgba(255, 255, 255, 0.05);
  --hero-hue: 240; --hero-sat: 0;
  /* Sharper corners */
  --radius-sm: 3px; --radius-md: 4px; --radius-lg: 6px; --radius-xl: 8px;
}
/* Quieter: drop the title shimmer + button pulse */
:root[data-theme="mono"] .hero-title span { animation: none; }
:root[data-theme="mono"] .btn-glow { animation: none; }

/* ── Aurora — animated gradient backdrop, rounder (animation change) ──── */
:root[data-theme="aurora"] {
  --color-accent: #a78bfa; --color-accent-hover: #c4b5fd; --color-accent-2: #f0abfc;
  --color-accent-rgb: 167, 139, 250;
  --color-accent-glow: rgba(167, 139, 250, 0.18);
  --color-accent-bg: rgba(167, 139, 250, 0.08);
  --hero-hue: 280; --hero-sat: 72;
  --radius-md: 14px; --radius-lg: 20px; --radius-xl: 28px;
}
:root[data-theme="aurora"] body::before {
  content: ""; position: fixed; inset: -20%; z-index: -1; pointer-events: none;
  background:
    radial-gradient(40% 40% at 20% 25%, rgba(167,139,250,0.22), transparent 70%),
    radial-gradient(45% 45% at 80% 30%, rgba(56,189,248,0.16), transparent 70%),
    radial-gradient(50% 50% at 50% 85%, rgba(236,72,153,0.16), transparent 70%);
  filter: blur(40px);
  animation: auroraDrift 24s ease-in-out infinite alternate;
}
@keyframes auroraDrift {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(3%, -3%) scale(1.08); }
  100% { transform: translate(-3%, 2%) scale(1.04); }
}

/* ── Focus — squared corners, left-aligned (layout change) ─────────────── */
:root[data-theme="focus"] {
  --color-accent: #f97316; --color-accent-hover: #fb923c; --color-accent-2: #fdba74;
  --color-accent-rgb: 249, 115, 22;
  --color-accent-glow: rgba(249, 115, 22, 0.15);
  --color-accent-bg: rgba(249, 115, 22, 0.08);
  --hero-hue: 28; --hero-sat: 80;
  --radius-sm: 2px; --radius-md: 3px; --radius-lg: 4px; --radius-xl: 6px;
}

/* Respect reduced motion for theme-added animations */
@media (prefers-reduced-motion: reduce) {
  :root[data-theme="aurora"] body::before { animation: none; }
}

/* ═══ Theme switcher UI ═══════════════════════════════════════════════ */
.theme-fab {
  position: fixed; z-index: 9990;
  right: calc(18px + env(safe-area-inset-right, 0px));
  bottom: calc(18px + env(safe-area-inset-bottom, 0px));
  display: inline-flex; align-items: center; gap: 8px;
  height: 44px; padding: 0 16px;
  border-radius: 999px; border: 1px solid var(--color-border-2);
  background: var(--glass-bg); color: var(--color-text);
  backdrop-filter: saturate(160%) blur(16px); -webkit-backdrop-filter: saturate(160%) blur(16px);
  font: 600 13px/1 var(--font-sans);
  box-shadow: var(--shadow-md); cursor: pointer;
  transition: transform 200ms cubic-bezier(0.22,1,0.36,1), border-color 200ms ease;
}
.theme-fab:hover { border-color: var(--color-accent); }
.theme-fab:active { transform: scale(0.95); }
.theme-fab__dot {
  width: 14px; height: 14px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  box-shadow: 0 0 10px var(--color-accent-glow);
}

.theme-pop {
  position: fixed; z-index: 9991;
  right: calc(18px + env(safe-area-inset-right, 0px));
  bottom: calc(72px + env(safe-area-inset-bottom, 0px));
  width: 260px; max-width: calc(100vw - 32px);
  padding: 14px; border-radius: 16px;
  border: 1px solid var(--color-border-2); background: var(--glass-bg);
  backdrop-filter: saturate(160%) blur(20px); -webkit-backdrop-filter: saturate(160%) blur(20px);
  box-shadow: var(--shadow-lg);
  transform-origin: bottom right;
  transform: scale(0.92) translateY(8px); opacity: 0; visibility: hidden;
  transition: transform 220ms cubic-bezier(0.22,1,0.36,1), opacity 160ms ease, visibility 0s linear 220ms;
}
.theme-pop.open { transform: scale(1) translateY(0); opacity: 1; visibility: visible; transition-delay: 0s; }
.theme-pop__head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
}
.theme-pop__title { font: 700 13px/1 var(--font-sans); color: var(--color-text); }
.theme-pop__random {
  border: 1px solid var(--color-border-2); background: transparent; color: var(--color-text-muted);
  border-radius: 999px; padding: 5px 11px; font: 600 11px/1 var(--font-sans); cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease;
}
.theme-pop__random:hover { color: var(--color-accent); border-color: var(--color-accent); }

.theme-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.theme-swatch {
  position: relative; aspect-ratio: 1/1; border-radius: 10px; cursor: pointer;
  border: 2px solid transparent; padding: 0; overflow: hidden;
  transition: transform 180ms cubic-bezier(0.22,1,0.36,1);
}
.theme-swatch:hover { transform: translateY(-2px); }
.theme-swatch::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--sw-a), var(--sw-b));
}
.theme-swatch--on { border-color: var(--color-text); }
.theme-swatch--on::before {
  content: "✓"; position: absolute; inset: 0; z-index: 1;
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 15px;
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}
.theme-swatch__label {
  position: absolute; z-index: 1; left: 0; right: 0; bottom: 0;
  font: 600 9px/1 var(--font-sans); color: #fff; text-align: center;
  padding: 3px 0; background: linear-gradient(0deg, rgba(0,0,0,0.55), transparent);
  text-shadow: 0 1px 2px rgba(0,0,0,0.6);
}