:root {
  color-scheme: light;
  --bg: #f3f7f6;
  --panel: #fffefd;
  --panel-strong: #ffffff;
  --text: #1f2523;
  --muted: #68716d;
  --line: #ddd7ca;
  --accent: #b9382f;
  --accent-2: #196a72;
  --accent-3: #6a4b8f;
  --shadow: 0 24px 70px rgba(47, 38, 26, 0.14);
  --radius: 8px;
}

:root.dark {
  color-scheme: dark;
  --bg: #171a19;
  --panel: #202421;
  --panel-strong: #262b27;
  --text: #f0ede5;
  --muted: #a9b0aa;
  --line: #3a403b;
  --accent: #f06f5f;
  --accent-2: #70c4c8;
  --accent-3: #c0a1e8;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 14% 12%, rgba(25, 106, 114, 0.12), transparent 31rem),
    linear-gradient(135deg, rgba(185, 56, 47, 0.06), transparent 34rem),
    linear-gradient(180deg, rgba(106, 75, 143, 0.04), transparent 28rem),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(19rem, 24rem);
  gap: clamp(1rem, 3vw, 2rem);
  width: min(1060px, calc(100% - 2rem));
  min-height: 100vh;
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 5rem) 0;
}

.word-stage,
.side-panel {
  min-width: 0;
}

.word-stage {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.section-title {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.word-card,
.side-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--panel), transparent 5%);
  box-shadow: var(--shadow);
}

.word-card {
  display: flex;
  flex: 1;
  flex-direction: column;
  justify-content: center;
  gap: clamp(1.6rem, 5vw, 3.2rem);
  min-height: min(38rem, calc(100vh - 10rem));
  padding: clamp(1.4rem, 5vw, 3rem);
}

.word-heading {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: clamp(12rem, 30vw, 18rem);
  padding: 0 clamp(3.25rem, 7vw, 4.5rem);
  text-align: center;
}

.word-heading > div {
  min-width: 0;
  width: 100%;
  max-width: 100%;
}

h2 {
  display: inline-block;
  overflow-wrap: normal;
  margin: 0;
  font-family: "Playpen Sans", "Segoe Print", "Bradley Hand", cursive;
  font-size: clamp(4.5rem, 12vw, 9.5rem);
  font-weight: 650;
  line-height: 0.95;
  letter-spacing: 0;
  word-break: normal;
  hyphens: none;
  white-space: nowrap;
}

.phonetic {
  margin: 0.8rem 0 0;
  color: var(--accent-2);
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-family: "Playpen Sans", "Segoe Print", "Bradley Hand", cursive;
  font-weight: 400;
}

.theme-button,
.save-button,
.control-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.55rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--panel-strong);
}

.theme-button,
.save-button {
  position: absolute;
  top: 0.25rem;
  flex: 0 0 auto;
  width: 2.9rem;
  height: 2.9rem;
  padding: 0;
  color: var(--accent);
  font-size: 1.5rem;
  line-height: 1;
}

.theme-button {
  left: 0;
  color: var(--accent-2);
}

.save-button {
  right: 0;
}

.save-button[aria-pressed="true"] {
  border-color: color-mix(in srgb, var(--accent), var(--line) 30%);
  color: var(--accent);
}

.word-details {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 0;
}

.word-details div,
.panel-section {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

dt {
  margin-bottom: 0.45rem;
  color: var(--accent);
  font-size: 0.83rem;
  font-weight: 800;
  text-align: center;
}

dd,
.panel-section p:last-child {
  margin: 0;
  color: var(--text);
  font-size: 1rem;
  line-height: 1.65;
}

.controls {
  display: grid;
  grid-template-columns: 1fr;
}

.control-button {
  gap: 0.45rem;
  padding: 0.2rem 0.9rem;
  min-height: 3.15rem;
  font-weight: 700;
}

.control-button.primary {
  border-color: color-mix(in srgb, var(--accent-2), var(--line) 35%);
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
}

.side-panel {
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
  padding: 1rem;
  position: sticky;
  top: 2rem;
}

.saved-list {
  display: grid;
  gap: 0.45rem;
  margin: 0.8rem 0 0;
  padding: 0;
  list-style: none;
}

.level-switch {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.45rem;
  margin-top: 0.8rem;
}

.level-option {
  min-height: 2.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--panel-strong);
  font-weight: 700;
}

.level-option.active {
  border-color: color-mix(in srgb, var(--accent-2), var(--line) 25%);
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
}

.saved-list button {
  width: 100%;
  min-height: 2.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--panel-strong);
  text-align: left;
  padding: 0 0.7rem;
}

.empty-state {
  color: var(--muted);
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .side-panel {
    position: static;
  }

  .word-details {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .app-shell {
    width: min(100% - 1rem, 1060px);
    padding: 0.75rem 0 1rem;
  }

  .word-heading {
    min-height: 14rem;
    padding: 0 3rem;
  }

  .theme-button,
  .save-button {
    width: 2.9rem;
  }

  .controls {
    grid-template-columns: 1fr;
  }

  h2 {
    font-size: clamp(3.5rem, 17vw, 5.8rem);
  }
}