:root {
  color-scheme: light;
  --bg-top: #fdf6e3;
  --bg-bottom: #d8eef2;
  --panel: rgba(255, 252, 246, 0.88);
  --panel-strong: #fffaf0;
  --line: rgba(58, 73, 84, 0.16);
  --text: #24313d;
  --muted: #5f7283;
  --accent: #ea6f4b;
  --accent-deep: #bc4f32;
  --accent-soft: #ffe2d9;
  --shadow: 0 18px 50px rgba(46, 64, 87, 0.14);
  --radius: 24px;
  --font-display: "Aptos Display", "Yu Gothic UI Semibold", sans-serif;
  --font-body: "Yu Gothic UI", "Hiragino Sans", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.72), transparent 30%),
    linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
}

button,
input {
  font: inherit;
}

.app-shell {
  width: min(960px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.meta-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.status-panel,
.controls-panel,
.card-panel,
.keyboard-panel {
  margin-top: 18px;
}

.status-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 18px 20px;
}

.meta-value {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
}

.progress-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  margin-top: 8px;
}

.progress-bar {
  height: 14px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(58, 73, 84, 0.12);
}

.progress-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #f4a261);
  transition: width 180ms ease;
}

.controls-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

.toggle input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.card-panel {
  padding: 20px;
}

.word-card {
  position: relative;
  overflow: hidden;
  min-height: 340px;
  padding: 28px;
  border-radius: 20px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.96), rgba(252, 244, 229, 0.92)),
    var(--panel-strong);
  border: 1px solid rgba(255, 255, 255, 0.65);
}

.word-card::after {
  content: "";
  position: absolute;
  inset: auto -60px -70px auto;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(234, 111, 75, 0.18), transparent 70%);
}

.card-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.word-text {
  margin: 26px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 5rem);
  line-height: 1.04;
  overflow-wrap: anywhere;
}

.meaning-area {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px dashed rgba(58, 73, 84, 0.24);
}

.meaning-text {
  margin: 12px 0 0;
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.5;
}

.actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 14px 18px;
  cursor: pointer;
  transition:
    transform 120ms ease,
    box-shadow 120ms ease,
    background-color 120ms ease;
}

button:hover {
  transform: translateY(-1px);
}

button:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(234, 111, 75, 0.35);
  outline-offset: 2px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
  transform: none;
}

.primary-button {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 12px 24px rgba(234, 111, 75, 0.24);
}

.primary-button:hover {
  background: var(--accent-deep);
}

.ghost-button,
.secondary-button {
  color: var(--text);
  background: #ffffff;
  border: 1px solid rgba(58, 73, 84, 0.14);
}

.keyboard-panel {
  padding: 16px 20px;
}

.keyboard-help {
  margin: 8px 0 0;
  color: var(--muted);
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100vw - 20px, 960px);
    padding-top: 22px;
  }

  .status-panel {
    grid-template-columns: 1fr;
  }

  .progress-row {
    grid-template-columns: 1fr;
  }

  .controls-panel {
    flex-direction: column;
    align-items: stretch;
  }

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

  .word-card {
    min-height: 300px;
    padding: 22px;
  }
}