:root {
  --bg: #0f172a;
  --bg2: #1e293b;
  --fg: #e2e8f0;
  --dim: #94a3b8;
  --accent: #fbbf24;
  --good: #22c55e;
  --bad: #ef4444;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--fg);
  font-family: -apple-system, "PingFang TC", "Noto Sans TC", "Helvetica Neue", sans-serif;
  min-height: 100vh; padding-bottom: env(safe-area-inset-bottom);
}
.hidden { display: none !important; }

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; gap: 6px; padding: 10px 12px;
  background: var(--bg2); border-bottom: 1px solid #334155;
}
.tab {
  flex: 1; padding: 12px 6px; border: none; border-radius: 10px;
  background: transparent; color: var(--dim); font-size: 15px; cursor: pointer;
}
.tab.active { background: var(--accent); color: #0f172a; font-weight: 700; }

.view { padding: 12px; }
.view-head { display: flex; align-items: baseline; gap: 10px; }
h1 { font-size: 20px; margin: 4px 0 12px; }
.count { color: var(--dim); font-size: 14px; }

.list { display: flex; flex-direction: column; gap: 10px; }

.card {
  background: var(--bg2); border: 1px solid #334155; border-radius: 14px;
  padding: 14px; display: flex; flex-direction: column; gap: 10px;
}
.card-top { display: flex; gap: 8px; align-items: center; }
.card-id { color: var(--dim); font-size: 12px; }
.card-theme { color: var(--accent); font-size: 12px; flex: 1; }
.card-due { color: var(--dim); font-size: 12px; }

.card-zh { font-size: 20px; line-height: 1.5; font-weight: 600; }
.card-reveal { display: flex; flex-direction: column; gap: 6px; border-top: 1px dashed #334155; padding-top: 10px; }
.card-jp { color: var(--accent); font-size: 14px; line-height: 1.5; }
.card-en { color: var(--dim); font-size: 14px; line-height: 1.4; }

.card-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.act {
  border: 1px solid #334155; background: #0f172a; color: var(--fg);
  border-radius: 10px; padding: 10px 12px; font-size: 14px; cursor: pointer; min-width: 44px;
}
.act.rate-good { color: var(--good); }
.act.rate-bad { color: var(--bad); }
.act:active { background: #334155; }

.theme-block { margin-bottom: 18px; }
.theme-title { color: var(--dim); font-size: 13px; text-transform: uppercase; letter-spacing: .05em; margin: 4px 0 8px; }

.empty { color: var(--dim); text-align: center; padding: 40px 16px; font-size: 15px; }

/* drive mode */
#view-drive { padding: 8px 12px; }
.drive-zh { font-size: 30px; line-height: 1.5; font-weight: 700; text-align: center; padding: 20px 8px; min-height: 40vh; display: flex; align-items: center; justify-content: center; }
.drive-reveal { text-align: center; padding: 6px 8px 16px; display: flex; flex-direction: column; gap: 8px; }
.drive-reveal .jp { color: var(--accent); font-size: 16px; line-height: 1.5; }
.drive-reveal .en { color: var(--dim); font-size: 15px; }
.drive-controls { display: flex; gap: 16px; justify-content: center; padding: 10px 0; }
.big {
  width: 76px; height: 76px; border-radius: 50%; border: 1px solid #334155;
  background: var(--bg2); color: var(--fg); font-size: 26px; cursor: pointer;
}
.big.primary { background: var(--accent); color: #0f172a; width: 92px; height: 92px; font-size: 30px; }
.drive-meta, .drive-rate { display: flex; gap: 10px; justify-content: center; padding: 8px 0; flex-wrap: wrap; }
.chip {
  border: 1px solid #334155; background: #0f172a; color: var(--fg);
  border-radius: 999px; padding: 12px 18px; font-size: 15px; cursor: pointer;
}
.chip.rate-good { color: var(--good); }
.chip.rate-bad { color: var(--bad); }