:root {
  --primary: #00ff88;
  --bg: #1a1d23;
  --card: #252932;
  --card2: #2d333d;
  --text: #e0e6ed;
  --muted: #8a93a2;
  --line: #3a404a;
  --danger: #e53e3e;
  --warn: #f6ad55;
}
* { box-sizing: border-box; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
  background: var(--bg); color: var(--text); margin: 0; padding: 20px;
  display: flex; justify-content: center; min-height: 100vh;
}
a { color: var(--primary); }
.wrap { width: 100%; max-width: 560px; }
.wrap-wide { width: 100%; max-width: 1080px; }

.brand { font-size: 11px; color: var(--muted); letter-spacing: 3px; margin: 0 0 14px; }
.card {
  background: var(--card); padding: 26px; border-radius: 22px;
  box-shadow: 0 20px 50px rgba(0,0,0,.5); border: 1px solid #333; margin-bottom: 18px;
}
.title-badge {
  background: linear-gradient(135deg, rgba(0,255,136,.12), rgba(0,255,136,0));
  border-left: 5px solid var(--primary); color: var(--primary);
  padding: 14px 16px; border-radius: 8px; font-weight: 700; font-size: 20px; margin-bottom: 18px;
}
.reading-text {
  background: var(--card2); border: 1px solid #444; padding: 20px; border-radius: 16px;
  text-align: left; font-size: 18px; line-height: 1.85; color: #fff; margin: 14px 0;
  min-height: 140px; white-space: pre-wrap; word-break: break-word;
}
label.fld { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 6px; }
input, select, textarea {
  width: 100%; padding: 12px; border-radius: 10px; border: 1px solid #444;
  background: #1a1d23; color: #fff; font-size: 16px; font-family: inherit;
}
textarea { min-height: 120px; line-height: 1.6; resize: vertical; }
.row { display: flex; gap: 10px; }
.row > * { flex: 1; }

.visualizer { background: #111; border-radius: 12px; height: 80px; margin: 14px 0;
  border: 1px solid #333; overflow: hidden; }
canvas { width: 100%; height: 100%; display: block; }

.btn { padding: 15px; border-radius: 14px; border: none; font-weight: 700; font-size: 16px;
  cursor: pointer; transition: .2s; color: #fff; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.btn-rec { background: var(--danger); }
.btn-stop { background: #4a5568; }
.btn-send { background: var(--primary); color: #000; grid-column: span 2; }
.btn-primary { background: var(--primary); color: #000; }
.btn-ghost { background: #333a45; }
.btn-danger { background: var(--danger); }
.btn-sm { padding: 8px 12px; font-size: 13px; border-radius: 9px; }

.status { margin-top: 14px; font-size: 14px; color: var(--primary); font-weight: 700; text-align: center; }

.class-links { display: grid; gap: 14px; margin-top: 8px; }
.class-link {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 20px; background: var(--card2); border: 1px solid var(--line);
  border-radius: 14px; text-decoration: none; color: var(--text); transition: .2s;
}
.class-link:hover { border-color: var(--primary); transform: translateY(-2px); }
.class-link b { font-size: 18px; }
.class-link small { color: var(--muted); display: block; margin-top: 3px; }
.class-link .go { color: var(--primary); font-weight: 700; }

/* 後台 */
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.tab { padding: 10px 16px; border-radius: 10px; background: var(--card2); border: 1px solid var(--line);
  cursor: pointer; font-weight: 600; font-size: 14px; }
.tab.active { background: var(--primary); color: #000; border-color: var(--primary); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .5px; }
tr:hover td { background: rgba(255,255,255,.02); }
.pill { padding: 3px 9px; border-radius: 20px; font-size: 12px; font-weight: 700; }
.pill.new { background: rgba(246,173,85,.15); color: var(--warn); }
.pill.reviewed { background: rgba(0,255,136,.15); color: var(--primary); }
.hint { color: var(--muted); font-size: 13px; line-height: 1.6; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.hidden { display: none !important; }
.stat-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px,1fr)); gap: 12px; }
.stat { background: var(--card2); border: 1px solid var(--line); border-radius: 14px; padding: 16px; }
.stat .n { font-size: 30px; font-weight: 800; color: var(--primary); }
.stat .l { color: var(--muted); font-size: 13px; margin-top: 4px; }
audio { width: 100%; margin-top: 8px; }
.toolbar { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
.toolbar .spacer { flex: 1; }
@media (max-width: 640px) { .grid2 { grid-template-columns: 1fr; } td .btn-sm { margin-bottom: 4px; } }