:root {
  --bg: #f8fafc; --card: #ffffff; --ink: #0f172a; --muted: #475569; --line: #e2e8f0;
  --brand: #1d4ed8; --brand-ink: #ffffff; --link: #1d4ed8;
  --good: #15803d; --good-bg: #dcfce7;
  --fair: #92400e; --fair-bg: #fef3c7;
  --poor: #b91c1c; --poor-bg: #fee2e2;
  --missed: #6d28d9; --missed-bg: #ede9fe;
  --rec: #ef4444;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120; --card: #111827; --ink: #e5e7eb; --muted: #a3b1c6; --line: #1f2937;
    --brand: #2563eb; --link: #93c5fd;
    --good: #4ade80; --good-bg: #052e16;
    --fair: #fbbf24; --fair-bg: #3a2a05;
    --poor: #f87171; --poor-bg: #450a0a;
    --missed: #c4b5fd; --missed-bg: #2e1065;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); }
body {
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", Roboto, sans-serif;
  padding: env(safe-area-inset-top) max(16px, env(safe-area-inset-right)) calc(24px + env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  max-width: 720px; margin: 0 auto;
}
button { font: inherit; color: inherit; cursor: pointer; }
.top { display: flex; align-items: center; justify-content: space-between; padding: 12px 0 4px; }
.top h1 { font-size: 20px; margin: 0; }
.icon { background: none; border: 0; font-size: 22px; min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; position: sticky; top: env(safe-area-inset-top); background: var(--bg); padding: 8px 0; z-index: 2; }
.steps button { border: 1px solid var(--line); background: var(--card); border-radius: 10px; padding: 8px 2px; font-size: 14px; min-height: 44px; }
.steps button.active { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }

.tab { display: none; padding-top: 8px; }
.tab.active { display: block; }
.label { display: block; color: var(--muted); font-size: 14px; margin: 14px 0 6px; }
.hint { color: var(--muted); font-size: 14px; min-height: 1.2em; }
textarea, input[type=password], input[type=number] {
  width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 12px;
  background: var(--card); color: var(--ink); font: 17px/1.6 Georgia, "Times New Roman", serif;
}
input[type=password], input[type=number] { font-family: inherit; }

.big-btn { display: block; width: 100%; text-align: center; border: 0; border-radius: 14px; padding: 14px; margin: 14px 0; background: var(--brand); color: var(--brand-ink); font-weight: 600; }
.big-btn.secondary { background: var(--card); color: var(--ink); border: 1px solid var(--line); }
.big-btn:disabled { opacity: .5; }
.link-btn { display: block; text-align: center; color: var(--link); font-size: 15px; margin: 8px 0; padding: 12px 0; min-height: 44px; }

.passage { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 12px 8px; font: 20px/1.4 Georgia, "Times New Roman", serif; }
.passage.muted { white-space: pre-line; font-size: 17px; line-height: 1.8; max-height: 42vh; overflow: auto; }
.passage p { margin: 0 0 10px; }
.w { border: 0; border-radius: 8px; padding: 0 4px; margin: 1px 0; min-width: 44px; min-height: 44px; font: inherit; background: none; vertical-align: middle; }
.w.good { color: var(--good); }
.w.fair { color: var(--fair); background: var(--fair-bg); }
.w.poor { color: var(--poor); background: var(--poor-bg); font-weight: 600; }
.w.missed { color: var(--missed); background: var(--missed-bg); text-decoration: line-through; }
.w.passed { outline: 2px solid var(--good); }
.legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: 14px; margin: 6px 0; }
.legend .good { color: var(--good); } .legend .fair { color: var(--fair); } .legend .poor { color: var(--poor); } .legend .missed { color: var(--missed); }

.record { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; margin: 24px auto 4px; width: 150px; height: 150px; border-radius: 50%; border: 6px solid var(--line); background: var(--card); font-size: 15px; }
.record .dot { width: 46px; height: 46px; border-radius: 50%; background: var(--rec); transition: border-radius .2s; }
.record.on { border-color: var(--rec); animation: pulse 1.2s infinite; }
.record.on .dot { border-radius: 8px; width: 38px; height: 38px; }
.record.small { width: 96px; height: 96px; margin: 8px auto; border-width: 4px; font-size: 13px; }
.record.small .dot { width: 30px; height: 30px; }
.record:disabled { opacity: .5; }
@keyframes pulse { 50% { box-shadow: 0 0 0 10px color-mix(in srgb, var(--rec) 20%, transparent); } }
.timer { text-align: center; font-variant-numeric: tabular-nums; font-size: 22px; margin: 0; }

.summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px; text-align: center; }
.stat b { display: block; font-size: 26px; font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted); font-size: 13px; }

.progress { position: relative; height: 34px; background: var(--card); border: 1px solid var(--line); border-radius: 17px; overflow: hidden; margin: 8px 0 14px; }
.progress .bar { position: absolute; inset: 0 auto 0 0; width: 0; background: var(--good-bg); transition: width .3s; }
.progress span { position: relative; display: block; text-align: center; line-height: 32px; font-size: 15px; font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1px solid var(--line); background: var(--card); border-radius: 12px; padding: 8px 12px; font: 18px Georgia, serif; text-align: left; }
.chip small { display: block; font: 12px -apple-system, sans-serif; color: var(--muted); }
.chip.passed { border-color: var(--good); background: var(--good-bg); }
.done { text-align: center; padding: 20px 0; }
.done p { font-size: 28px; margin: 0 0 8px; }

.sheet { border: 0; padding: 0; width: 100%; max-width: 720px; margin: auto auto 0; border-radius: 20px 20px 0 0; background: var(--card); color: var(--ink); max-height: 92vh; }
.sheet::backdrop { background: rgb(0 0 0 / .45); }
.sheet-body { padding: 18px 16px calc(18px + env(safe-area-inset-bottom)); position: relative; }
.sheet h2 { font: 34px Georgia, serif; margin: 4px 0; }
.close { position: absolute; right: 10px; top: 10px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0; }
.pill { border: 1px solid var(--line); background: var(--bg); border-radius: 999px; padding: 8px 14px; font-size: 15px; min-height: 44px; }
.pill:disabled { opacity: .4; }
.phonemes { display: flex; gap: 6px; flex-wrap: wrap; margin: 8px 0; }
.ph { border-radius: 8px; padding: 4px 8px; font: 17px "Lucida Sans Unicode", "Arial Unicode MS", sans-serif; text-align: center; }
.ph small { display: block; font-size: 11px; }
.ph.good { background: var(--good-bg); color: var(--good); } .ph.fair { background: var(--fair-bg); color: var(--fair); } .ph.poor { background: var(--poor-bg); color: var(--poor); }
.practice-box { text-align: center; border-top: 1px solid var(--line); margin-top: 10px; padding-top: 10px; }
.score { font-size: 48px; font-weight: 700; font-variant-numeric: tabular-nums; }
.score.good { color: var(--good); } .score.fair { color: var(--fair); } .score.poor { color: var(--poor); }

.onboarding { position: fixed; inset: 0; background: rgb(0 0 0 / .5); display: flex; align-items: flex-end; z-index: 20; }
.onboarding[hidden] { display: none; }
.onboarding-card { background: var(--card); color: var(--ink); width: 100%; max-width: 720px; margin: 0 auto; border-radius: 20px 20px 0 0; padding: 20px 16px calc(16px + env(safe-area-inset-bottom)); }
.onboarding-card h2 { margin: 0 0 8px; font-size: 22px; }
.onboarding-card ol { list-style: none; padding: 0; margin: 0; }
.onboarding-card li { padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 15px; }
.onboarding-card li b { display: block; color: var(--ink); font-size: 18px; }
.score.pop { animation: pop .5s ease; }
@keyframes pop { 0% { transform: scale(.6); } 60% { transform: scale(1.25); } 100% { transform: scale(1); } }
@media (prefers-reduced-motion: reduce) { .score.pop, .record.on { animation: none; } }
.toast { position: fixed; left: 16px; right: 16px; bottom: calc(20px + env(safe-area-inset-bottom)); background: var(--ink); color: var(--bg); padding: 12px 14px; border-radius: 12px; text-align: center; z-index: 10; }