/* Base / Reset */
:root {
  --bg: #0b0c10;
  --card: #121317;
  --text: #e6e6e6;
  --muted: #a9b1bc;
  --primary: #5aa9ff;
  --primary-600: #3e90ef;
  --ring: 0 0 0 3px rgba(90, 169, 255, 0.35);
  --border: #23262d;
}

:root.light {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #2563eb;
  --primary-600: #1d4ed8;
  --ring: 0 0 0 3px rgba(37, 99, 235, 0.25);
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

html, body {
  padding: 0;
  margin: 0;
  height: 100%;
}

body {
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* Layout */
.container {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding: 24px;
}

.app-header {
  position: sticky;
  top: 0;
  backdrop-filter: saturate(140%) blur(6px);
  background: color-mix(in hsl, var(--bg), transparent 35%);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.2px;
  margin: 0;
}

.app-footer {
  border-top: 1px solid var(--border);
  margin-top: 20px;
}

.app-footer a { color: var(--primary); }

/* Search */
.search-box {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 12px;
  box-shadow: 0 1px 0 rgba(0,0,0,0.06);
  margin-top: 20px;
}

.search-box input {
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font-size: 16px;
  outline: none;
}

.search-box input:focus {
  border-color: var(--primary);
  box-shadow: var(--ring);
}

/* Buttons */
button {
  appearance: none;
  border: none;
  border-radius: 10px;
  padding: 12px 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.02s ease, background 0.2s ease, color 0.2s ease;
}

button:active { transform: translateY(1px); }

button.primary {
  background: var(--primary);
  color: white;
}

button.primary:hover { background: var(--primary-600); }

button.ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

button.ghost:hover { color: var(--text); }

.icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 10px;
}

/* Result */
.result-box {
  margin-top: 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.word-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.word-title h2 {
  margin: 0;
  font-size: 28px;
}

.phonetic {
  color: var(--muted);
}

.definitions {
  margin: 12px 0 0;
  padding-left: 18px;
}

.definitions li { margin: 8px 0; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
}

.synonyms {
  margin-top: 12px;
  color: var(--muted);
}

/* History */
.history {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  background: color-mix(in hsl, var(--primary), transparent 85%);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 14px;
}

.chip:hover { background: color-mix(in hsl, var(--primary), transparent 75%); }

/* Utilities */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

audio { margin-top: 10px; }

@media (max-width: 560px) {
  .search-box { grid-template-columns: 1fr 1fr; }
  #wordInput { grid-column: 1 / -1; }
}