/* ==========================================================================
   Glassmorphism panel — "frosted glass over a blurred, colorful backdrop"
   Signature: sunset-over-water mesh (coral / magenta / cyan / gold) behind
   translucent, blurred glass surfaces with a soft top-edge light catch and
   a faint frosted grain. Flatter & softer than Liquid Glass — no refraction,
   just blur + transparency + a whisper of a border.
   ========================================================================== */

.theme-frost {
  --frost-white: 255, 255, 255;
  --frost-ink: 8, 14, 28;
  --frost-radius-lg: 22px;
  --frost-radius-md: 16px;
  --frost-radius-sm: 12px;
  --frost-blur: blur(18px) saturate(160%);
  --frost-accent-coral: 255, 126, 95;
  --frost-accent-magenta: 255, 62, 165;
  --frost-accent-cyan: 45, 212, 255;
  --frost-accent-gold: 255, 190, 110;

  position: relative;
  isolation: isolate;
  color: #f5f7fb;
  background:
    radial-gradient(600px 480px at 8% 12%, rgba(var(--frost-accent-coral), .55), transparent 60%),
    radial-gradient(560px 460px at 88% 8%, rgba(var(--frost-accent-magenta), .48), transparent 62%),
    radial-gradient(620px 520px at 12% 92%, rgba(var(--frost-accent-cyan), .40), transparent 60%),
    radial-gradient(520px 440px at 92% 88%, rgba(var(--frost-accent-gold), .38), transparent 60%),
    linear-gradient(160deg, #0c1a30 0%, #142642 48%, #0a1730 100%);
  text-shadow: 0 1px 3px rgba(0, 0, 0, .28);
}

/* faint frosted grain overlay so the blur reads as "glass", not flat plastic */
.theme-frost::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .35;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/></svg>");
  background-size: 160px 160px;
  z-index: 0;
}

.theme-frost .panel-head,
.theme-frost .demo-block {
  position: relative;
  z-index: 1;
}

.theme-frost .panel-head h2 {
  font-weight: 700;
  letter-spacing: -.01em;
}

.theme-frost .panel-desc {
  color: rgba(var(--frost-white), .78);
}

.theme-frost h3 {
  color: rgba(var(--frost-white), .7);
  font-weight: 600;
  letter-spacing: .02em;
}

/* ---- shared glass surface ------------------------------------------------ */

.theme-frost .btn,
.theme-frost .field-input,
.theme-frost .field-select,
.theme-frost .demo-card,
.theme-frost .frost-app,
.theme-frost .frost-row,
.theme-frost .frost-navbar,
.theme-frost .frost-fab,
.theme-frost .frost-player,
.theme-frost .toggle-track {
  backdrop-filter: var(--frost-blur);
  -webkit-backdrop-filter: var(--frost-blur);
  border: 1px solid rgba(var(--frost-white), .28);
  box-shadow:
    0 10px 30px -8px rgba(var(--frost-ink), .45),
    inset 0 1px 0 rgba(var(--frost-white), .35);
}

/* ---- buttons -------------------------------------------------------------- */

.theme-frost .demo-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.theme-frost .btn {
  appearance: none;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  font-size: .92rem;
  color: #fff;
  padding: 11px 22px;
  min-height: 44px;
  border-radius: 999px;
  background: rgba(var(--frost-white), .14);
  transition: transform .18s ease, background-color .18s ease, box-shadow .18s ease;
}

.theme-frost .btn:hover {
  background: rgba(var(--frost-white), .22);
  transform: translateY(-1px);
}

.theme-frost .btn:active {
  transform: translateY(0);
}

.theme-frost .btn:focus-visible {
  outline: 2px solid rgba(var(--frost-accent-cyan), .9);
  outline-offset: 2px;
}

.theme-frost .btn-primary {
  background: rgba(var(--frost-white), .26);
  box-shadow:
    0 10px 30px -6px rgba(var(--frost-accent-cyan), .45),
    inset 0 1px 0 rgba(var(--frost-white), .5);
}

.theme-frost .btn-primary:hover {
  background: rgba(var(--frost-white), .34);
}

.theme-frost .btn-secondary {
  background: rgba(var(--frost-white), .06);
  color: rgba(var(--frost-white), .9);
}

.theme-frost .btn-secondary:hover {
  background: rgba(var(--frost-white), .12);
}

.theme-frost .btn-icon {
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  background: rgba(var(--frost-white), .16);
}

.theme-frost .btn-disabled,
.theme-frost .btn[disabled] {
  cursor: not-allowed;
  opacity: .5;
  background: rgba(var(--frost-white), .06);
  box-shadow: none;
  transform: none !important;
}

.theme-frost .btn-destructive {
  background: rgba(255, 90, 90, .22);
  border-color: rgba(255, 140, 140, .4);
  box-shadow:
    0 10px 26px -8px rgba(255, 70, 70, .5),
    inset 0 1px 0 rgba(var(--frost-white), .35);
}

.theme-frost .btn-destructive:hover {
  background: rgba(255, 90, 90, .32);
}

/* ---- form ------------------------------------------------------------------ */

.theme-frost .demo-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 360px;
}

.theme-frost .field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.theme-frost .field-row {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

.theme-frost .field-label {
  font-size: .8rem;
  font-weight: 600;
  color: rgba(var(--frost-white), .78);
  letter-spacing: .02em;
}

.theme-frost .field-input,
.theme-frost .field-select {
  width: 100%;
  min-height: 44px;
  padding: 10px 14px;
  border-radius: var(--frost-radius-sm);
  background: rgba(var(--frost-ink), .18);
  color: #fff;
  font: inherit;
  font-size: .92rem;
  box-shadow:
    inset 0 2px 6px rgba(var(--frost-ink), .35),
    inset 0 1px 0 rgba(var(--frost-white), .12);
  border-color: rgba(var(--frost-white), .22);
}

.theme-frost .field-input::placeholder {
  color: rgba(var(--frost-white), .5);
}

.theme-frost .field-input:focus,
.theme-frost .field-select:focus {
  outline: none;
  border-color: rgba(var(--frost-accent-cyan), .7);
  box-shadow:
    0 0 0 3px rgba(var(--frost-accent-cyan), .25),
    inset 0 2px 6px rgba(var(--frost-ink), .35);
}

.theme-frost .field-select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, rgba(255, 255, 255, .8) 50%),
    linear-gradient(135deg, rgba(255, 255, 255, .8) 50%, transparent 50%);
  background-position: right 18px center, right 12px center;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 34px;
}

.theme-frost .field-select option {
  background: #142642;
  color: #fff;
}

.theme-frost .btn-submit {
  align-self: flex-start;
}

/* toggle switch */

.theme-frost .toggle {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 26px;
}

.theme-frost .toggle input {
  position: absolute;
  inset: 0;
  opacity: 0;
  margin: 0;
  cursor: pointer;
  z-index: 1;
}

.theme-frost .toggle-track {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: rgba(var(--frost-ink), .3);
  transition: background-color .2s ease;
}

.theme-frost .toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, .35);
  transition: transform .2s ease, box-shadow .2s ease;
}

.theme-frost .toggle input:checked ~ .toggle-track {
  background: rgba(var(--frost-accent-cyan), .55);
}

.theme-frost .toggle input:checked ~ .toggle-track .toggle-thumb {
  transform: translateX(20px);
  box-shadow: 0 0 10px rgba(var(--frost-accent-cyan), .8);
}

.theme-frost .toggle input:focus-visible ~ .toggle-track {
  outline: 2px solid rgba(var(--frost-accent-cyan), .9);
  outline-offset: 2px;
}

/* ---- card ------------------------------------------------------------------ */

.theme-frost .demo-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px;
  max-width: 380px;
  border-radius: var(--frost-radius-lg);
  background: rgba(var(--frost-white), .12);
}

.theme-frost .demo-card-icon {
  flex: none;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border-radius: 50%;
  background: rgba(var(--frost-white), .18);
  border: 1px solid rgba(var(--frost-white), .3);
}

.theme-frost .demo-card-body h4 {
  margin: 0 0 4px;
  font-size: 1rem;
  font-weight: 700;
}

.theme-frost .demo-card-body p {
  margin: 0 0 10px;
  font-size: .86rem;
  line-height: 1.5;
  color: rgba(var(--frost-white), .82);
}

.theme-frost .demo-card-action {
  font-size: .84rem;
  font-weight: 600;
  color: #bdf0ff;
  text-decoration: none;
  border-bottom: 1px solid rgba(189, 240, 255, .4);
  padding-bottom: 1px;
  transition: color .18s ease, border-color .18s ease;
}

.theme-frost .demo-card-action:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, .7);
}

/* ---- phone mock ------------------------------------------------------------ */

.theme-frost .phone-screen {
  background:
    radial-gradient(180px 160px at 15% 10%, rgba(var(--frost-accent-magenta), .55), transparent 65%),
    radial-gradient(200px 180px at 90% 15%, rgba(var(--frost-accent-cyan), .5), transparent 60%),
    radial-gradient(220px 200px at 20% 95%, rgba(var(--frost-accent-gold), .45), transparent 60%),
    linear-gradient(165deg, #12213c 0%, #0a1730 100%);
}

.theme-frost .frost-app {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 14px 12px 10px;
  box-sizing: border-box;
  gap: 10px;
  color: #fff;
}

.theme-frost .frost-app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--frost-radius-md);
  background: rgba(var(--frost-white), .14);
  font-size: .86rem;
  font-weight: 700;
}

.theme-frost .frost-app-header-icon {
  font-size: .95rem;
}

.theme-frost .frost-app-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
}

.theme-frost .frost-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--frost-radius-sm);
  background: rgba(var(--frost-white), .1);
}

.theme-frost .frost-row-icon {
  flex: none;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(var(--frost-white), .16);
  font-size: .85rem;
}

.theme-frost .frost-row-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
}

.theme-frost .frost-row-text strong {
  font-size: .76rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.theme-frost .frost-row-text small {
  font-size: .68rem;
  color: rgba(var(--frost-white), .72);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.theme-frost .frost-row-time {
  flex: none;
  font-size: .64rem;
  color: rgba(var(--frost-white), .6);
}

.theme-frost .frost-fab {
  position: absolute;
  right: 14px;
  bottom: 62px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(var(--frost-white), .35);
  background: rgba(var(--frost-accent-cyan), .35);
  color: #fff;
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 22px -6px rgba(var(--frost-accent-cyan), .6);
}

.theme-frost .frost-navbar {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 10px 6px;
  border-radius: 999px;
  background: rgba(var(--frost-white), .14);
}

.theme-frost .frost-nav-item {
  font-size: .92rem;
  color: rgba(var(--frost-white), .55);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.theme-frost .frost-nav-item.is-active {
  color: #fff;
  background: rgba(var(--frost-white), .2);
}

/* ---- usage demo: music player widget --------------------------------------- */

.theme-frost .demo-usage {
  display: flex;
}

.theme-frost .frost-player {
  width: 100%;
  max-width: 340px;
  padding: 18px;
  border-radius: var(--frost-radius-lg);
  background: rgba(var(--frost-white), .12);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.theme-frost .frost-player-top {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-frost .frost-player-art {
  flex: none;
  width: 48px;
  height: 48px;
  border-radius: var(--frost-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: linear-gradient(135deg, rgba(var(--frost-accent-magenta), .55), rgba(var(--frost-accent-cyan), .55));
  border: 1px solid rgba(var(--frost-white), .3);
}

.theme-frost .frost-player-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.theme-frost .frost-player-meta strong {
  font-size: .9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.theme-frost .frost-player-meta small {
  font-size: .76rem;
  color: rgba(var(--frost-white), .7);
}

.theme-frost .frost-player-progress {
  height: 5px;
  border-radius: 999px;
  background: rgba(var(--frost-ink), .35);
  overflow: hidden;
}

.theme-frost .frost-player-progress-fill {
  width: 46%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(var(--frost-accent-cyan), 1), rgba(var(--frost-accent-magenta), .9));
  box-shadow: 0 0 8px rgba(var(--frost-accent-cyan), .7);
}

.theme-frost .frost-player-time {
  display: flex;
  justify-content: space-between;
  font-size: .68rem;
  color: rgba(var(--frost-white), .65);
  margin-top: -6px;
}

.theme-frost .frost-player-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.theme-frost .frost-player-play {
  width: 50px;
  height: 50px;
  font-size: 1.1rem;
  background: rgba(var(--frost-white), .26);
}

/* ---- alert dialog ------------------------------------------------------------ */

.theme-frost .theme-alert-backdrop {
  background: rgba(var(--frost-ink), .55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 20px;
  box-sizing: border-box;
}

.theme-frost .theme-alert-box {
  width: 100%;
  max-width: 360px;
  padding: 26px 24px 22px;
  border-radius: var(--frost-radius-lg);
  text-align: center;
  color: #f5f7fb;
  background: rgba(var(--frost-white), .16);
  backdrop-filter: var(--frost-blur);
  -webkit-backdrop-filter: var(--frost-blur);
  border: 1px solid rgba(var(--frost-white), .3);
  box-shadow:
    0 24px 60px -12px rgba(var(--frost-ink), .6),
    inset 0 1px 0 rgba(var(--frost-white), .4);
}

.theme-frost .alert-icon {
  width: 54px;
  height: 54px;
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border-radius: 50%;
  background: rgba(255, 90, 90, .22);
  border: 1px solid rgba(255, 140, 140, .4);
  box-shadow: 0 10px 26px -8px rgba(255, 70, 70, .5);
}

.theme-frost .alert-title {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
}

.theme-frost .alert-desc {
  margin: 0 0 20px;
  font-size: .86rem;
  line-height: 1.55;
  color: rgba(var(--frost-white), .8);
}

.theme-frost .alert-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.theme-frost .alert-actions .btn {
  flex: 1;
  padding-left: 0;
  padding-right: 0;
}

/* ---- loading ------------------------------------------------------------------ */

.theme-frost .demo-loading {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
}

.theme-frost .loading-panel {
  width: 100%;
  max-width: 340px;
  min-height: 108px;
  padding: 20px;
  box-sizing: border-box;
  border-radius: var(--frost-radius-lg);
  background: rgba(var(--frost-white), .12);
  backdrop-filter: var(--frost-blur);
  -webkit-backdrop-filter: var(--frost-blur);
  border: 1px solid rgba(var(--frost-white), .28);
  box-shadow:
    0 10px 30px -8px rgba(var(--frost-ink), .45),
    inset 0 1px 0 rgba(var(--frost-white), .35);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

.theme-frost .loading-spinner {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 3px solid rgba(var(--frost-white), .22);
  border-top-color: rgba(var(--frost-accent-cyan), .95);
  box-shadow: 0 0 14px rgba(var(--frost-accent-cyan), .55);
  animation: frost-spin .85s linear infinite;
}

.theme-frost .loading-skeleton {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: 10px;
}

.theme-frost .skel-line {
  display: block;
  height: 12px;
  border-radius: 999px;
  background: linear-gradient(
    100deg,
    rgba(var(--frost-white), .1) 30%,
    rgba(var(--frost-white), .3) 50%,
    rgba(var(--frost-white), .1) 70%
  );
  background-size: 220% 100%;
  animation: frost-shimmer 1.6s ease-in-out infinite;
}

.theme-frost .skel-w1 { width: 90%; }
.theme-frost .skel-w2 { width: 70%; }
.theme-frost .skel-w3 { width: 82%; }

.theme-frost .loading-result {
  text-align: center;
}

.theme-frost .loading-result p {
  margin: 0;
  font-size: .88rem;
  font-weight: 600;
  color: #bdf0ff;
}

/* idle: show skeleton only */
.theme-frost .loading-panel[data-state="idle"] .loading-skeleton {
  display: flex;
}

/* loading: spinner + dimmed skeleton */
.theme-frost .loading-panel[data-state="loading"] .loading-spinner {
  display: block;
}

.theme-frost .loading-panel[data-state="loading"] .loading-skeleton {
  display: flex;
  opacity: .4;
}

/* done: reveal result, hide spinner/skeleton */
.theme-frost .loading-panel[data-state="done"] .loading-result[hidden] {
  display: block;
}

@keyframes frost-spin {
  to { transform: rotate(360deg); }
}

@keyframes frost-shimmer {
  0% { background-position: 160% 0; }
  100% { background-position: -60% 0; }
}

/* ---- responsiveness --------------------------------------------------------- */

@media (max-width: 420px) {
  .theme-frost .demo-card {
    max-width: 100%;
  }

  .theme-frost .demo-form {
    max-width: 100%;
  }

  .theme-frost .frost-player {
    max-width: 100%;
  }

  .theme-frost .loading-panel {
    max-width: 100%;
  }

  .theme-frost .theme-alert-box {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .theme-frost .btn,
  .theme-frost .toggle-track,
  .theme-frost .toggle-thumb {
    transition: none;
  }

  .theme-frost .loading-spinner,
  .theme-frost .skel-line {
    animation: none;
  }
}