:root {
  --bg: #ffffff;
  --text: #1a2332;
  --muted: #5a6b7f;
  --border: #d8dee6;
  --accent: #1e40af;
  --accent-soft: #eef2fb;
  --danger: #b91c1c;
  --ok: #15803d;
  --warn: #b45309;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;
  --serif: 'Iowan Old Style', Charter, Georgia, Cambria, 'Times New Roman', serif;
}
:root[data-theme="dark"] {
  --bg: #101418; --text: #e8edf2; --muted: #94a3b3; --border: #2c3640; --accent: #5b8def; --accent-soft: #16202e; --danger: #f87171; --ok: #4ade80; --warn: #fbbf24;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --bg: #101418; --text: #e8edf2; --muted: #94a3b3; --border: #2c3640; --accent: #5b8def; --accent-soft: #16202e; --danger: #f87171; --ok: #4ade80; --warn: #fbbf24; }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 20px 16px 80px; }
h1 { font-family: var(--serif); font-size: 28px; font-weight: 600; margin: 22px 0 16px; letter-spacing: 0; }
h2 { font-family: var(--serif); font-size: 18px; font-weight: 600; margin: 0 0 8px; }
p { margin: 6px 0; }
.muted { color: var(--muted); }
.accent { color: var(--accent); }
.accent-text { color: var(--accent); font-weight: 600; }

.topbar { display: flex; align-items: center; gap: 14px; padding: 10px 16px; border-bottom: 1px solid var(--border); position: sticky; top: 0; background: var(--bg); z-index: 5; flex-wrap: wrap; row-gap: 4px; }
.logo { font-weight: 700; letter-spacing: 0.06em; font-family: var(--mono); }
.topbar nav { display: flex; gap: 4px; }
.topbar-right { margin-left: auto; display: flex; gap: 6px; }

button { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 8px 14px; cursor: pointer; min-height: 44px; transition: border-color 150ms ease-out, background-color 150ms ease-out, opacity 150ms ease-out; }
button:hover { border-color: var(--accent); }
button:active { transform: translateY(1px); }
button:disabled { opacity: 0.55; cursor: default; transform: none; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { filter: brightness(1.08); }
button.big { width: 100%; padding: 14px; font-size: 16px; }
button.ghost { border-color: transparent; color: var(--muted); }
button.ghost:hover { color: var(--text); border-color: var(--border); }
button.ghost.danger, .danger-btn { color: var(--danger); }
.topbar nav button { border-color: transparent; min-height: 40px; }
.topbar nav button.active { border-color: var(--accent); color: var(--accent); }

.card { border: 1px solid var(--border); border-radius: 8px; padding: 16px; margin: 12px 0; }
.card.narrow { max-width: 380px; margin: 60px auto; }
.card.nudge { border-color: var(--accent); background: var(--accent-soft); }
.action-card h2 { margin-top: 0; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 560px) { .grid2 { grid-template-columns: 1fr; } }

label { display: block; margin: 12px 0 4px; font-size: 13px; color: var(--muted); }
input, select, textarea { width: 100%; font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 9px 10px; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
form button[type="submit"] { margin-top: 16px; width: 100%; background: var(--accent); border-color: var(--accent); color: #fff; }
.msg { min-height: 1.2em; font-size: 13px; color: var(--danger); }
.msg.ok { color: var(--ok); }
.row { display: flex; gap: 10px; align-items: end; flex-wrap: wrap; }
.row label { margin: 0 0 4px; }
.row select { width: auto; }

.stat-row { display: flex; gap: 12px; flex-wrap: wrap; }
.stat { flex: 1; min-width: 96px; border: 1px solid var(--border); border-radius: 8px; padding: 12px 8px; text-align: center; }
.stat-num { display: block; font-size: 26px; font-weight: 700; font-family: var(--mono); }
.stat-label { font-size: 12px; color: var(--muted); }

.pill { border: 1px solid var(--border); border-radius: 999px; padding: 3px 12px; font-size: 13px; color: var(--muted); }

.convo-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.convo-head h1 { margin: 12px 0; }
.convo-head .ghost { margin-left: auto; }
.convo-log { border: 1px solid var(--border); border-radius: 8px; padding: 12px; min-height: 240px; max-height: 46vh; overflow-y: auto; }
.turn { margin: 10px 0; }
.turn .who { font-size: 11px; letter-spacing: 0.08em; color: var(--muted); font-family: var(--mono); }
.turn .bubble { padding: 8px 12px; border-radius: 8px; border: 1px solid var(--border); display: inline-block; max-width: 92%; }
.turn.coach .bubble { background: var(--accent-soft); border-color: transparent; }
.turn .feedback { font-size: 13px; margin-top: 4px; padding-left: 12px; border-left: 2px solid var(--accent); }
.turn .feedback .fb-label { color: var(--muted); font-size: 11px; font-family: var(--mono); }
.talk-zone { text-align: center; margin-top: 14px; }
.talk-btn { width: 100%; padding: 22px; font-size: 17px; font-weight: 700; letter-spacing: 0.05em; border: 2px solid var(--accent); border-radius: 10px; color: var(--accent); user-select: none; -webkit-user-select: none; touch-action: none; }
.talk-btn.recording { background: var(--accent); color: #fff; }
.rec { display: inline-flex; align-items: center; gap: 8px; margin-top: 8px; font-family: var(--mono); }
.rec-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--danger); animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: 0.2; } }

.q-item { margin: 14px 0; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.q-item:last-child { border-bottom: none; }
.choices { display: grid; gap: 6px; margin-top: 6px; }
.choices label { display: flex; gap: 8px; align-items: center; margin: 0; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; color: var(--text); font-size: 14px; cursor: pointer; }
.choices input { width: auto; }
.choices label:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }

.mono-list { font-family: var(--mono); font-size: 13px; }
.mono-list .li { display: flex; gap: 10px; padding: 7px 0; border-bottom: 1px solid var(--border); }
.mono-list .li:last-child { border-bottom: none; }
.mono-list .li .grow { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.card-text { font-size: 18px; }
.diff-hit { color: var(--ok); }
.diff-miss { color: var(--danger); text-decoration: underline; }
.score-big { font-size: 34px; font-weight: 700; font-family: var(--mono); }
.score-big.good { color: var(--ok); }
.score-big.poor { color: var(--danger); }
hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }

::placeholder { color: var(--muted); opacity: 1; }
.talk-btn.compact { width: auto; padding: 10px 16px; font-size: 14px; font-weight: 600; }

.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 8px; font-size: 14px; max-width: 90vw; z-index: 30; opacity: 0; transition: opacity 200ms ease-out; pointer-events: none; }
.toast.show { opacity: 1; }

@media (max-width: 420px) {
  .topbar { gap: 8px; padding: 8px 10px; }
  .topbar nav button, .topbar-right button { padding: 6px 8px; font-size: 13px; }
  .logo { font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .rec-dot { opacity: 1; }
}

details.card summary { cursor: pointer; font-weight: 600; padding: 2px 0; }
details.card summary:hover { color: var(--accent); }
details.card[open] summary { margin-bottom: 8px; }

/* --- visual refresh --- */
.stat { background: var(--accent-soft); border-color: transparent; }
.stat-num { color: var(--accent); }
.action-card { transition: border-color 150ms ease-out; }
.action-card:hover { border-color: var(--accent); }
.action-card h2 { display: flex; align-items: center; gap: 8px; }
.action-card h2::before { content: ''; width: 10px; height: 10px; border-radius: 3px; background: var(--accent); flex: none; }
details.card summary::marker { color: var(--accent); }
.convo-log { background: color-mix(in srgb, var(--accent-soft) 40%, var(--bg)); }
h1 { letter-spacing: -0.01em; }
.topbar { backdrop-filter: blur(8px); }

.theme-sel { width: auto; min-height: 36px; padding: 6px 8px; font-size: 13px; color: var(--muted); border-color: transparent; background: var(--bg); cursor: pointer; }
.theme-sel:hover { color: var(--text); border-color: var(--border); }

/* --- graphics: icons, track colors, charts --- */
.card-ico { width: 28px; height: 28px; color: var(--accent); display: block; margin-bottom: 6px; }
.action-card h2::before { display: none; }
.ico { width: 20px; height: 20px; }
.track-sum { display: flex; align-items: center; gap: 10px; }
.track-ico { display: inline-flex; width: 30px; height: 30px; border-radius: 8px; align-items: center; justify-content: center; color: #fff; flex: none; }
.tk-work .track-ico { background: #2563eb; }
.tk-business .track-ico { background: #7c3aed; }
.tk-interview .track-ico { background: #0d9488; }
.tk-sales .track-ico { background: #db2777; }
.tk-daily .track-ico { background: #d97706; }
.tk-travel .track-ico { background: #0284c7; }
.tk-ielts .track-ico { background: #dc2626; }
.bars { display: flex; gap: 10px; align-items: flex-end; height: 110px; padding-top: 8px; }
.bar-col { flex: 1; max-width: 44px; display: flex; flex-direction: column; align-items: center; gap: 4px; height: 100%; justify-content: flex-end; }
.bar { width: 100%; border-radius: 4px 4px 0 0; background: var(--accent); opacity: 0.85; transition: height 300ms ease-out; }
.bar.good { background: var(--ok); }
.bar.poor { background: var(--danger); }
.bar-label { font-size: 10px; color: var(--muted); font-family: var(--mono); }

/* --- university-grade: identity + login + reports --- */
.logo { font-family: var(--serif); font-size: 17px; letter-spacing: 0.02em; font-weight: 600; }
.logo .accent { color: var(--accent); }
.card.narrow { max-width: 420px; margin: 48px auto; padding: 32px; }
.login-mark { font-family: var(--serif); font-size: 30px; font-weight: 600; text-align: center; margin: 0 0 2px; }
.login-mark span { color: var(--accent); }
.login-tag { text-align: center; color: var(--muted); font-size: 13.5px; margin: 0 0 20px; }
.card.narrow h1 { display: none; }
.report-badge { font-family: var(--serif); font-size: 56px; font-weight: 700; color: var(--accent); line-height: 1; }
.report-head { display: flex; align-items: center; gap: 18px; margin-bottom: 14px; }
.report-head .rb-label { color: var(--muted); font-size: 13px; }
.score-row { display: flex; align-items: center; gap: 10px; margin: 8px 0; }
.score-row .sr-name { width: 110px; font-size: 13.5px; color: var(--muted); flex: none; }
.score-track { flex: 1; height: 8px; border-radius: 4px; background: var(--accent-soft); overflow: hidden; }
.score-fill { height: 100%; border-radius: 4px; background: var(--accent); transition: width 400ms ease-out; }
.score-row .sr-val { width: 36px; text-align: right; font-family: var(--mono); font-size: 13px; }
.cando { margin: 10px 0 0; padding: 0 0 0 4px; list-style: none; }
.cando li { padding: 6px 0 6px 26px; position: relative; font-size: 14.5px; border-bottom: 1px solid var(--border); }
.cando li:last-child { border-bottom: none; }
.cando li::before { content: ''; position: absolute; left: 2px; top: 11px; width: 14px; height: 14px; border-radius: 50%; background: var(--ok); mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='black' d='M9 16.2l-3.5-3.5L4 14.2 9 19.2 20 8.2l-1.4-1.4z'/%3E%3C/svg%3E") center/contain no-repeat;
}
.transcript { width: 100%; border-collapse: collapse; font-size: 14px; }
.transcript th { text-align: left; font-weight: 600; color: var(--muted); font-size: 12.5px; padding: 8px 10px; border-bottom: 2px solid var(--border); }
.transcript td { padding: 8px 10px; border-bottom: 1px solid var(--border); }
.transcript td.num { font-family: var(--mono); text-align: right; }
.section-note { font-size: 12.5px; color: var(--muted); border-top: 1px solid var(--border); margin-top: 14px; padding-top: 10px; }

/* --- Whoop-style data layer (hybrid with academic base) --- */
.hero { display: flex; gap: 20px; align-items: center; border: 1px solid var(--border); border-radius: 12px; padding: 18px; margin: 12px 0; }
.ring-wrap { position: relative; width: 132px; height: 132px; flex: none; }
.ring-wrap svg { transform: rotate(-90deg); }
.ring-bg { stroke: var(--accent-soft); }
.ring-fg { stroke: var(--accent); transition: stroke-dashoffset 600ms ease-out; }
.ring-fg.done { stroke: var(--ok); }
.ring-center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.ring-center .rc-num { font-family: var(--mono); font-size: 26px; font-weight: 700; line-height: 1; }
.ring-center .rc-label { font-size: 10.5px; color: var(--muted); margin-top: 3px; }
.hero-side { flex: 1; display: grid; gap: 8px; min-width: 0; }
.metric { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; }
.metric .m-dot { width: 9px; height: 9px; border-radius: 50%; flex: none; background: var(--muted); }
.metric.ok .m-dot { background: var(--ok); }
.metric.warn .m-dot { background: var(--warn); }
.metric.poor .m-dot { background: var(--danger); }
.metric .m-val { font-family: var(--mono); font-weight: 700; margin-left: auto; }
.metric .m-name { font-size: 13px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.insight { border-left: none; background: var(--accent-soft); border-radius: 8px; padding: 10px 14px; font-size: 14px; margin: 12px 0; }
.trend { width: 100%; height: 120px; }
.trend .t-line { fill: none; stroke: var(--accent); stroke-width: 2; }
.trend .t-area { fill: var(--accent-soft); stroke: none; }
.trend .t-axis { stroke: var(--border); stroke-width: 1; }
@media (max-width: 520px) { .hero { flex-direction: column; } .hero-side { width: 100%; } }

.btn-xl { width: 100%; min-height: 76px; padding: 24px; font-size: 18px; font-weight: 700; letter-spacing: 0.03em; border-radius: 10px; border-width: 2px; margin: 6px 0; }
.talk-btn { background: color-mix(in srgb, var(--accent) 10%, var(--bg)); }
.shadow-talk { width: 100%; margin: 12px 0 6px; padding: 24px; font-size: 18px; min-height: 76px; }
.btn-play { color: var(--ok); border: 2px solid var(--ok); background: color-mix(in srgb, var(--ok) 10%, var(--bg)); }
.btn-play:hover { border-color: var(--ok); filter: brightness(1.05); }
.retry-btn { color: var(--warn); border: 2px solid var(--warn); background: color-mix(in srgb, var(--warn) 10%, var(--bg)); }
.retry-btn:hover { border-color: var(--warn); filter: brightness(1.05); }

.grade-row { display: flex; gap: 10px; margin-top: 12px; }
.grade-row button { flex: 1; min-height: 60px; font-size: 16px; font-weight: 700; border-width: 2px; border-radius: 10px; }
.btn-again { color: var(--danger); border-color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, var(--bg)); }
.btn-hard { color: var(--warn); border-color: var(--warn); background: color-mix(in srgb, var(--warn) 10%, var(--bg)); }
.btn-good { color: var(--ok); border-color: var(--ok); background: color-mix(in srgb, var(--ok) 10%, var(--bg)); }
.btn-again:hover { border-color: var(--danger); } .btn-hard:hover { border-color: var(--warn); } .btn-good:hover { border-color: var(--ok); }

.speed-btn { min-height: 44px; font-family: var(--mono); }
.speed-btn.active { color: var(--accent); border-color: var(--accent); }

.type-row { display: flex; gap: 8px; margin-top: 10px; }
.type-row input { flex: 1; }
.celebrate { color: var(--ok); font-weight: 700; font-size: 16px; }
.retry-inline { color: var(--warn); margin-left: 8px; }

.step-bar { display: flex; gap: 6px; align-items: center; margin: 8px 0 14px; }
.step-seg { flex: 1; height: 6px; border-radius: 3px; background: var(--accent-soft); }
.step-seg.on { background: var(--accent); }
.step-label { font-size: 12.5px; color: var(--muted); font-family: var(--mono); margin-left: 8px; }

.heatmap { display: grid; grid-template-columns: repeat(7, 1fr); gap: 5px; }
.hm-cell { aspect-ratio: 1; display: flex; align-items: center; justify-content: center; font-size: 10.5px; font-family: var(--mono); color: var(--muted); background: var(--accent-soft); border-radius: 5px; }
.hm-cell.hm1 { background: color-mix(in srgb, var(--accent) 25%, var(--bg)); color: var(--text); }
.hm-cell.hm2 { background: color-mix(in srgb, var(--accent) 55%, var(--bg)); color: #fff; }
.hm-cell.hm3 { background: var(--accent); color: #fff; font-weight: 700; }
.li-click { cursor: pointer; }
.li-click:hover { color: var(--accent); }
.transcript-row { padding: 10px 12px; border-bottom: 1px solid var(--border); background: color-mix(in srgb, var(--accent-soft) 40%, var(--bg)); border-radius: 8px; margin: 4px 0; font-size: 13px; }
.transcript-row .tr-coach { color: var(--muted); margin: 3px 0; }
.transcript-row .tr-you { margin: 3px 0; }
.transcript-row .tr-fix { color: var(--accent); margin: 0 0 6px 14px; font-size: 12.5px; }

.fr-steps { margin: 8px 0 4px; padding-left: 22px; }
.fr-steps li { padding: 4px 0; font-size: 14.5px; }