/* ── Reset & Base ────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --clr-bg:        #f6f8fa;
  --clr-surface:   #ffffff;
  --clr-border:    #d0d7de;
  --clr-text:      #24292f;
  --clr-muted:     #57606a;
  --clr-primary:   #0969da;
  --clr-danger:    #cf222e;
  --clr-secondary: #6e7781;
  --clr-match:     #1a7f37;
  --clr-similar:   #9a6700;
  --clr-miss:      #cf222e;
  --clr-match-bg:  #dafbe1;
  --clr-similar-bg:#fff8c5;
  --clr-miss-bg:   #ffebe9;
  --radius:        8px;
  --shadow:        0 1px 3px rgba(36,41,47,.12);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Layout ─────────────────────────────────────────────────────── */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ── Header ─────────────────────────────────────────────────────── */
header {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--clr-border);
}
header h1 { font-size: 2rem; font-weight: 700; }
.subtitle  { color: var(--clr-muted); margin-top: .35rem; }

/* ── Sections ───────────────────────────────────────────────────── */
section {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}
section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}
section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1rem 0 .6rem;
}

/* ── Passage Box ─────────────────────────────────────────────────── */
.passage-box {
  font-size: 1.05rem;
  line-height: 1.8;
  padding: 1rem;
  background: var(--clr-bg);
  border-radius: var(--radius);
  border: 1px solid var(--clr-border);
}
.placeholder { color: var(--clr-muted); font-style: italic; }

/* ── Word Spans (click-to-seek) ─────────────────────────────────── */
.word-span {
  display: inline;
  border-radius: 3px;
  padding: 1px 2px;
  transition: background .15s, color .15s;
}
.word-span.clickable {
  cursor: pointer;
}
.word-span.clickable:hover {
  background: #dbeafe;
  color: #1d4ed8;
}
.word-span.active {
  background: #fef08a;
  color: #713f12;
  font-weight: 700;
  border-radius: 3px;
}

/* ── Audio Player ───────────────────────────────────────────────── */
.audio-player-wrap {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

#audio-player {
  width: 100%;
  height: 44px;
  border-radius: var(--radius);
  accent-color: var(--clr-primary);
}

.audio-tip {
  font-size: .88rem;
  color: var(--clr-muted);
}

.audio-error {
  font-size: .88rem;
  color: var(--clr-miss);
  background: var(--clr-miss-bg);
  border: 1px solid #ffc1c0;
  border-radius: var(--radius);
  padding: .6rem .9rem;
}

.audio-error a {
  color: var(--clr-primary);
  font-weight: 600;
  text-decoration: none;
  margin-left: .25rem;
}
.audio-error a:hover { text-decoration: underline; }

/* ── Controls ───────────────────────────────────────────────────── */
.btn-row {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.btn {
  padding: .55rem 1.25rem;
  border: none;
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .15s, transform .1s;
}
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn:not(:disabled):hover { opacity: .88; }
.btn:not(:disabled):active { transform: scale(.97); }

.btn-primary   { background: var(--clr-primary);   color: #fff; }
.btn-danger    { background: var(--clr-danger);    color: #fff; }
.btn-secondary { background: var(--clr-secondary); color: #fff; }

/* ── Status Bar ─────────────────────────────────────────────────── */
.status-bar {
  font-size: .9rem;
  color: var(--clr-muted);
  padding: .4rem .6rem;
  border-left: 3px solid var(--clr-border);
  margin-top: .5rem;
  transition: color .2s, border-color .2s;
}
.status-bar.recording {
  color: var(--clr-danger);
  border-color: var(--clr-danger);
}
.status-bar.success {
  color: var(--clr-match);
  border-color: var(--clr-match);
}

/* ── Warning ────────────────────────────────────────────────────── */
.warning {
  background: #fff8c5;
  border: 1px solid #d4a72c;
  color: #633600;
  border-radius: var(--radius);
  padding: .75rem 1rem;
  font-size: .9rem;
  margin-bottom: .75rem;
}

/* ── Interim Box ────────────────────────────────────────────────── */
.interim-box {
  min-height: 60px;
  padding: .75rem 1rem;
  background: var(--clr-bg);
  border: 1px dashed var(--clr-border);
  border-radius: var(--radius);
  font-style: italic;
  color: var(--clr-muted);
}

/* ── Score Grid (Azure Pronunciation Assessment) ─────────────────── */
.score-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .75rem;
  margin-bottom: 1rem;
}

.score-tile {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: .85rem .5rem;
  text-align: center;
}

.score-tile-label {
  font-size: .78rem;
  color: var(--clr-muted);
  font-weight: 600;
  margin-bottom: .4rem;
  line-height: 1.3;
}

.score-tile-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--clr-primary);
}

.highlight-tile {
  border-color: var(--clr-primary);
  background: #ebf5ff;
}

/* ── Score Card (Web Speech fallback) ───────────────────────────── */
.score-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}
.score-label { font-size: .9rem; color: var(--clr-muted); font-weight: 600; }
.score-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--clr-primary);
  min-width: 4rem;
}

/* ── Word Grid ──────────────────────────────────────────────────── */
.word-grid {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-bottom: 1rem;
}

.word-chip {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: .35rem .6rem;
  border-radius: 6px;
  font-size: .85rem;
  font-weight: 500;
  min-width: 48px;
  text-align: center;
  line-height: 1.3;
}
.word-chip .original  { font-weight: 700; }
.word-chip .spoken    { font-size: .75rem; opacity: .75; }

.word-chip.match   { background: var(--clr-match-bg);   color: var(--clr-match);   }
.word-chip.similar { background: var(--clr-similar-bg); color: var(--clr-similar); }
.word-chip.miss    { background: var(--clr-miss-bg);    color: var(--clr-miss);    }

/* ── Legend ─────────────────────────────────────────────────────── */
.legend {
  display: flex;
  gap: 1rem;
  margin-top: .5rem;
}
.badge {
  font-size: .82rem;
  padding: .2rem .55rem;
  border-radius: 12px;
  font-weight: 600;
}
.badge.match   { background: var(--clr-match-bg);   color: var(--clr-match);   }
.badge.similar { background: var(--clr-similar-bg); color: var(--clr-similar); }
.badge.miss    { background: var(--clr-miss-bg);    color: var(--clr-miss);    }

/* ── Utility ─────────────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Footer ─────────────────────────────────────────────────────── */
footer {
  text-align: center;
  margin-top: 2.5rem;
  color: var(--clr-muted);
  font-size: .85rem;
}
footer a { color: var(--clr-primary); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* ── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 600px) {
  header h1  { font-size: 1.5rem; }
  .btn-row   { flex-direction: column; }
  .btn       { width: 100%; }
  .score-value { font-size: 2rem; }
  .score-grid  { grid-template-columns: repeat(2, 1fr); }
  .score-tile-value { font-size: 1.6rem; }
}