:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Deep Luxe — near-black graphite glass with one emerald-teal jewel accent. */
  --bg-outer: #050607;
  --page: #0a0b0d;
  --surface: #131619;
  --surface-2: #1c2126;
  --surface-3: #232a31;
  --line: #262c33;
  --line-soft: rgba(255, 255, 255, 0.06);
  --text: #f5f7f7;
  --muted: #8b949a;
  --accent: #2fe0bd;
  --accent-strong: #4ff0d0;
  --accent-soft: rgba(47, 224, 189, 0.13);
  --accent-ink: #04231d;
  --warning: #e7a35a;
  --danger: #ff6b6b;

  --radius-xl: 26px;
  --radius-l: 22px;
  --radius-m: 14px;
  --radius-control: 12px;
  --radius-s: 10px;
  --radius-pill: 999px;

  /* Type ramp — no half-pixels */
  --fs-caption: 11px;
  --fs-small: 12px;
  --fs-body: 13px;
  --fs-base: 15px;
  --fs-input: 16px;
  --fs-title: 17px;
  --fs-lg: 20px;

  /* Glass + depth */
  --glass: rgba(16, 19, 22, 0.72);
  --glass-2: rgba(22, 26, 31, 0.66);
  --glass-blur: saturate(160%) blur(28px);
  --glass-scrim: rgba(3, 5, 7, 0.62);
  --scrim-blur: blur(10px) saturate(115%);
  --grad-accent: linear-gradient(135deg, #2fe0bd 0%, #23bfd6 100%);
  --grad-sheen: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0));

  /* Elevation ladder: control → popover → modal */
  --elev-1: 0 4px 12px -4px rgba(0, 0, 0, 0.4);
  --elev-2: 0 12px 32px -12px rgba(0, 0, 0, 0.55), 0 0 0 1px var(--line-soft);
  --elev-3: 0 24px 60px -18px rgba(0, 0, 0, 0.66);
  --shadow: var(--elev-3);
  --shadow-sm: 0 6px 20px -8px rgba(0, 0, 0, 0.55);
  --accent-glow: 0 10px 34px -10px rgba(47, 224, 189, 0.5);
  --ring: 0 0 0 3px rgba(47, 224, 189, 0.26);

  /* Motion — three named durations + easing family */
  --dur-press: 120ms;
  --dur-fast: 180ms;
  --dur-enter: 240ms;
  --dur-sheet: 340ms;
  --ease-out: cubic-bezier(0.32, 0.72, 0, 1);
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.22, 1, 0.36, 1);

  /* JS updates --app-height from visualViewport; these are the pre-JS fallbacks. */
  --app-height: 100vh;

  background: var(--bg-outer);
  color: var(--text);
}

@supports (height: 100dvh) {
  :root {
    --app-height: 100dvh;
  }
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg-outer: #e9ebee;
  --page: #f6f7f8;
  --surface: #ffffff;
  --surface-2: #eef1f3;
  --surface-3: #e5e9ec;
  --line: #dde2e6;
  --line-soft: rgba(15, 25, 35, 0.06);
  --text: #14181b;
  --muted: #5f6b73;
  --accent: #0ea88c;
  --accent-strong: #0b8a72;
  --accent-soft: rgba(14, 168, 140, 0.12);
  --accent-ink: #ffffff;
  --warning: #b4530a;
  --danger: #c53030;

  --glass: rgba(255, 255, 255, 0.74);
  --glass-2: rgba(248, 250, 251, 0.7);
  --glass-scrim: rgba(20, 28, 36, 0.42);
  --grad-accent: linear-gradient(135deg, #12b394 0%, #0e9fb0 100%);
  --grad-sheen: linear-gradient(180deg, rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0));
  --elev-1: 0 4px 12px -6px rgba(23, 33, 43, 0.16);
  --elev-2: 0 12px 32px -14px rgba(23, 33, 43, 0.22), 0 0 0 1px var(--line-soft);
  --elev-3: 0 24px 60px -20px rgba(23, 33, 43, 0.24);
  --shadow-sm: 0 6px 20px -10px rgba(23, 33, 43, 0.18);
  --accent-glow: 0 10px 30px -10px rgba(14, 168, 140, 0.4);
  --ring: 0 0 0 3px rgba(14, 168, 140, 0.22);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

html,
body {
  height: 100%;
  height: var(--app-height);
  overflow: hidden;
}

body {
  margin: 0;
  color: var(--text);
  display: flex;
  justify-content: center;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* Layered depth: two faint accent auras over a near-black base. */
  background:
    radial-gradient(120% 80% at 15% -10%, rgba(47, 224, 189, 0.10), transparent 60%),
    radial-gradient(120% 90% at 100% 110%, rgba(58, 150, 214, 0.08), transparent 55%),
    var(--bg-outer);
}

:root[data-theme="light"] body {
  background:
    radial-gradient(120% 80% at 15% -10%, rgba(14, 168, 140, 0.10), transparent 60%),
    radial-gradient(120% 90% at 100% 110%, rgba(58, 150, 214, 0.07), transparent 55%),
    var(--bg-outer);
}

button,
textarea,
select,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: default;
}

button:focus-visible,
select:focus-visible,
textarea:focus-visible,
input:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

/* AC04 — text inputs energize on tap (:focus, not just :focus-visible). */
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--accent) 70%, var(--line));
  background-color: var(--surface-3);
  box-shadow: var(--ring);
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* ---- Motion primitives ---- */
@keyframes rise-in {
  from { opacity: 0; transform: translateY(8px) scale(0.985); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ---- Buttons / controls ---- */
.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--dur-fast) var(--ease-standard), border-color var(--dur-fast) var(--ease-standard), transform var(--dur-press) var(--ease-spring), box-shadow var(--dur-fast) var(--ease-standard);
}

/* AC10 — monochrome stroked chrome icons inherit sizing here; markup swaps live in index.html. */
.icon-btn svg {
  width: 18px;
  height: 18px;
}

.icon-btn.small svg {
  width: 16px;
  height: 16px;
}

.icon-btn:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.icon-btn:active {
  transform: scale(0.93);
}

.icon-btn.small {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  font-size: 14px;
}

.icon-btn.ghost {
  background: none;
  border-color: transparent;
}

.icon-btn.ghost:hover {
  background: var(--accent-soft);
  border-color: transparent;
}

.select {
  width: auto;
  height: 44px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--text);
  border-radius: var(--radius-s);
  padding: 0 34px 0 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: right 15px center, right 10px center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  transition: border-color var(--dur-fast) var(--ease-standard), box-shadow var(--dur-fast) var(--ease-standard), background-color var(--dur-fast) var(--ease-standard);
}

.select:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
}

/* AC04 — brighten the caret glyph from muted to the jewel accent on hover/focus.
   Sets background-image only, so the global :focus energize (background-color) keeps the caret. */
.select:hover,
.select:focus {
  background-image: linear-gradient(45deg, transparent 50%, var(--accent-strong) 50%), linear-gradient(135deg, var(--accent-strong) 50%, transparent 50%);
}

.select.full {
  width: 100%;
}

.select.mini {
  height: 36px;
  font-size: 13px;
  padding: 0 30px 0 12px;
  max-width: 60%;
}

[dir="rtl"] .select {
  padding: 0 12px 0 34px;
  background-position: left 15px center, left 10px center;
}

.segmented {
  position: relative;
  display: inline-flex;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  padding: 3px;
  gap: 2px;
  /* Inset track so the neutral thumb reads as a raised element. */
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.25);
}

/* AC15 — optional true-glide thumb, JS-positioned to the active button's offset (ui.js). */
.seg-thumb {
  position: absolute;
  top: 3px;
  bottom: 3px;
  left: 0;
  border-radius: var(--radius-pill);
  background: var(--surface);
  box-shadow: var(--shadow-sm), inset 0 0 0 1px var(--line-soft);
  transition: transform var(--dur-enter) var(--ease-spring), width var(--dur-enter) var(--ease-spring);
  pointer-events: none;
  z-index: 0;
}

.seg-btn {
  position: relative;
  z-index: 1;
  border: none;
  background: none;
  color: var(--muted);
  padding: 7px 15px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-small);
  font-weight: 700;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease-standard), background var(--dur-fast) var(--ease-standard), box-shadow var(--dur-fast) var(--ease-standard);
}

.seg-btn:hover {
  color: var(--text);
}

.seg-btn:not(.active):hover {
  background: color-mix(in srgb, var(--text) 6%, transparent);
}

.seg-btn.active {
  background: var(--surface);
  color: var(--accent-strong);
  box-shadow: var(--shadow-sm), inset 0 0 0 1px var(--line-soft);
}