:root {
  color-scheme: light;
  --ink: #19323c;
  --muted: #63727a;
  --paper: #fffdf7;
  --surface: #ffffff;
  --line: #dbe4e0;
  --teal: #0f8b8d;
  --teal-dark: #0a686a;
  --coral: #f25c54;
  --gold: #f6c85f;
  --mint: #e9f6ef;
  --rose: #fff1ef;
  --shadow: 0 16px 40px rgba(25, 50, 60, 0.12);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background:
    linear-gradient(135deg, rgba(15, 139, 141, 0.12), transparent 34%),
    linear-gradient(225deg, rgba(242, 92, 84, 0.11), transparent 30%),
    var(--paper);
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--ink);
}

button,
input {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

[hidden] {
  display: none !important;
}

.app-shell {
  width: min(100%, 980px);
  min-height: 100vh;
  margin: 0 auto;
  padding: max(18px, env(safe-area-inset-top)) 16px max(28px, env(safe-area-inset-bottom));
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0 18px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--teal-dark);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 2rem + 1vw, 3rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.tool-band {
  display: grid;
  min-width: 0;
  gap: 12px;
  padding: 14px;
  border: 1px solid rgba(219, 228, 224, 0.9);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.84);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.search-field {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 10px;
  min-height: 48px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
}

.search-field input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
}

.search-field input::placeholder {
  color: #7d8c92;
}

.segmented-control {
  display: grid;
  min-width: 0;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

#levelFilters {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.filter-stack {
  display: grid;
  min-width: 0;
  gap: 8px;
}

.group-control {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.filter-button,
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  cursor: pointer;
}

.filter-button {
  min-width: 0;
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 750;
  line-height: 1.15;
  white-space: normal;
}

.filter-button[aria-selected="true"] {
  border-color: var(--teal);
  background: var(--teal);
  color: #ffffff;
}

.summary-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 2px 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.summary-band strong {
  color: var(--ink);
}

.sound-grid {
  display: grid;
  min-width: 0;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.sound-card {
  position: relative;
  display: grid;
  min-width: 0;
  min-height: 166px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 8px 24px rgba(25, 50, 60, 0.08);
}

.sound-card:nth-child(4n + 1) {
  background: linear-gradient(180deg, #ffffff 0%, var(--mint) 100%);
}

.sound-card:nth-child(4n + 2) {
  background: linear-gradient(180deg, #ffffff 0%, #fff8e6 100%);
}

.sound-card:nth-child(4n + 3) {
  background: linear-gradient(180deg, #ffffff 0%, var(--rose) 100%);
}

.sound-topline,
.sound-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.audio-buttons {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.pill-row {
  display: flex;
  min-width: 0;
  flex-wrap: wrap;
  gap: 6px;
}

.stage-pill {
  display: inline-flex;
  max-width: 100%;
  min-height: 24px;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(25, 50, 60, 0.08);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0;
  white-space: nowrap;
}

.grapheme {
  display: block;
  margin: 16px 0 2px;
  font-size: clamp(2.25rem, 2rem + 2vw, 3.9rem);
  font-weight: 850;
  line-height: 0.9;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.phoneme {
  color: var(--teal-dark);
  font-size: 1rem;
  font-weight: 800;
}

.mnemonic {
  min-height: 42px;
  margin: 10px 0 4px;
  color: var(--ink);
  font-size: 1.04rem;
  font-weight: 800;
  line-height: 1.18;
}

.example {
  min-height: 22px;
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.25;
}

.icon-button {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border-radius: 50%;
  background: var(--ink);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 900;
  transition:
    transform 160ms ease,
    background 160ms ease;
}

.icon-button:hover,
.icon-button:focus-visible {
  background: var(--teal-dark);
  transform: translateY(-1px);
}

.icon-button:focus-visible,
.filter-button:focus-visible,
.search-field:focus-within {
  outline: 3px solid rgba(246, 200, 95, 0.82);
  outline-offset: 2px;
}

.install-button {
  width: auto;
  min-width: 96px;
  height: 42px;
  flex: 0 0 auto;
  padding: 0 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  line-height: 1;
  white-space: nowrap;
}

.play-button {
  background: var(--coral);
}

.audio-button {
  width: auto;
  min-width: 82px;
  height: 42px;
  flex: 0 1 auto;
  gap: 6px;
  padding: 0 12px;
  border-radius: 8px;
  font-size: 0.86rem;
  line-height: 1;
}

.example-play-button {
  background: var(--teal);
  font-size: 0.84rem;
}

.favorite-button {
  background: rgba(25, 50, 60, 0.1);
  color: var(--ink);
}

.favorite-button[aria-pressed="true"] {
  background: var(--gold);
  color: var(--ink);
}

.empty-state {
  grid-column: 1 / -1;
  padding: 32px 18px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--muted);
  text-align: center;
}

@media (min-width: 560px) {
  .app-shell {
    padding-inline: 28px;
  }

  .tool-band {
    grid-template-columns: 1fr;
  }

  .segmented-control {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  #levelFilters {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .group-control {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .sound-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .sound-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .app-shell {
    padding-block: 32px 42px;
  }

  .tool-band {
    grid-template-columns: 1fr 1.45fr;
    align-items: center;
  }

  .group-control {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .sound-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}