:root {
  --bg: #f4f1ea;
  --panel: #fffdf8;
  --panel-2: #ebe7dd;
  --text: #181a1f;
  --muted: #73736f;
  --line: #d9d4c9;
  --accent: #e84c3d;
  --accent-2: #c83c31;
  --good: #299b6b;
  --bad: #d04a43;
  --shadow: 0 18px 50px rgba(32, 29, 24, .08);
}

html[data-theme="dark"] {
  --bg: #0d0f13;
  --panel: #15181e;
  --panel-2: #1d2128;
  --text: #f3f0e9;
  --muted: #999da6;
  --line: #2a2f38;
  --accent: #ff6254;
  --accent-2: #ff786d;
  --good: #55c792;
  --bad: #ff7369;
  --shadow: 0 18px 50px rgba(0,0,0,.24);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  transition: background .2s ease, color .2s ease;
}
button, input, select { font: inherit; }
button { color: inherit; }
button, select { cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 2px; }

.app-shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.topbar { height: 92px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 12px; background: transparent; border: 0; padding: 0; text-align: left; }
.brand-mark { display:grid; place-items:center; width: 44px; height:44px; border-radius: 13px; background: var(--accent); color:white; font: 700 25px/1 "Yu Gothic", "Hiragino Sans", sans-serif; transform: rotate(-3deg); }
.brand-copy { display:flex; flex-direction:column; line-height:1.1; }
.brand-copy strong { font-size: 16px; letter-spacing: -.01em; }
.brand-copy small { margin-top: 5px; color: var(--muted); font-size: 11px; letter-spacing:.12em; }
.topnav { display:flex; align-items:center; gap:8px; }
.nav-btn { border:0; background:transparent; padding:10px 14px; color:var(--muted); border-radius:10px; font-weight:650; }
.nav-btn:hover, .nav-btn.active { color:var(--text); background:var(--panel-2); }
.icon-btn { width: 42px; padding:10px; }

main { min-height: calc(100vh - 170px); }
.page { display:none; padding: 62px 0 36px; }
.page.active { display:block; animation: pageIn .22s ease both; }
@keyframes pageIn { from { opacity:0; transform:translateY(5px); } to { opacity:1; transform:none; } }

.hero { display:grid; grid-template-columns: 1.3fr .7fr; gap:40px; align-items:center; min-height:260px; margin-bottom:34px; }
.eyebrow, .step { margin:0 0 10px; text-transform:uppercase; letter-spacing:.14em; font-size:11px; font-weight:800; color:var(--accent); }
h1 { margin:0; font-size:clamp(42px, 7vw, 76px); line-height:.98; letter-spacing:-.055em; }
h1 span { color:var(--muted); }
.hero-text { color:var(--muted); line-height:1.7; max-width:650px; margin:20px 0 0; }
.hero-glyph { justify-self:end; width:210px; height:210px; display:grid; place-items:center; border:1px solid var(--line); border-radius:44px; background:var(--panel); box-shadow:var(--shadow); font:700 118px/1 "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif; color:var(--accent); transform:rotate(4deg); }

.setup-grid { display:grid; grid-template-columns:.78fr 1.22fr; gap:18px; }
.panel { background:var(--panel); border:1px solid var(--line); border-radius:20px; padding:24px; box-shadow:var(--shadow); }
.panel-heading { display:flex; justify-content:space-between; align-items:flex-start; margin-bottom:18px; }
.panel-heading.split { gap:18px; align-items:center; }
.panel h2 { margin:0; font-size:24px; letter-spacing:-.025em; }
.segmented { display:grid; grid-template-columns:repeat(3, 1fr); gap:5px; padding:5px; background:var(--panel-2); border-radius:12px; }
.segmented.compact { min-width:230px; grid-template-columns:repeat(2, 1fr); }
.seg-btn { border:0; background:transparent; padding:12px 10px; border-radius:9px; color:var(--muted); font-weight:700; }
.seg-btn.active { background:var(--panel); color:var(--text); box-shadow:0 3px 15px rgba(0,0,0,.08); }

.mode-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:10px; }
.mode-card { text-align:left; display:flex; flex-direction:column; min-height:118px; gap:6px; padding:16px; border-radius:14px; border:1px solid var(--line); background:var(--bg); transition:.16s ease; }
.mode-card:hover { border-color:var(--muted); transform:translateY(-1px); }
.mode-card.active { border-color:var(--accent); background:color-mix(in srgb, var(--accent) 8%, var(--panel)); box-shadow: inset 0 0 0 1px var(--accent); }
.mode-card strong { font-size:15px; }
.mode-card small { color:var(--muted); }
.mode-icon { color:var(--accent); font:800 15px/1.3 ui-monospace, SFMono-Regular, Menlo, monospace; margin-bottom:auto; }

.kana-panel { margin-top:18px; }
.mini-actions { display:flex; gap:6px; flex-wrap:wrap; justify-content:flex-end; }
.text-btn { border:0; background:var(--panel-2); color:var(--muted); border-radius:8px; padding:8px 10px; font-size:12px; font-weight:750; }
.text-btn:hover { color:var(--text); }
.kana-groups { display:grid; grid-template-columns:repeat(2,1fr); gap:18px; }
.kana-group { border-top:1px solid var(--line); padding-top:14px; }
.kana-group-head { display:flex; align-items:center; justify-content:space-between; margin-bottom:10px; }
.kana-group-head strong { font-size:13px; }
.kana-group-head small { color:var(--muted); }
.kana-chips { display:flex; flex-wrap:wrap; gap:7px; }
.kana-chip { min-width:46px; height:44px; padding:0 10px; border-radius:10px; background:var(--bg); border:1px solid var(--line); display:flex; align-items:center; justify-content:center; gap:5px; font-weight:800; }
.kana-chip .kana { font:700 18px/1 "Yu Gothic", "Hiragino Sans", sans-serif; }
.kana-chip small { color:var(--muted); font-size:10px; font-weight:700; }
.kana-chip.active { color:white; background:var(--accent); border-color:var(--accent); }
.kana-chip.active small { color:rgba(255,255,255,.72); }
.selection-summary { display:flex; justify-content:space-between; gap:20px; margin-top:18px; padding-top:18px; border-top:1px solid var(--line); font-size:13px; }
.muted { color:var(--muted); }

.launch-panel { margin-top:18px; display:flex; align-items:center; justify-content:space-between; gap:24px; }
.session-options { display:flex; align-items:end; gap:30px; }
.session-options label, .quick-stat small { display:block; color:var(--muted); font-size:11px; font-weight:700; margin-bottom:6px; }
select, .small-input { border:1px solid var(--line); background:var(--bg); color:var(--text); padding:11px 12px; border-radius:10px; }
.quick-stat strong { font-size:22px; }
.primary-btn, .secondary-btn { border-radius:12px; border:1px solid transparent; padding:13px 18px; font-weight:800; transition:.15s ease; }
.primary-btn { background:var(--accent); color:white; min-width:160px; }
.primary-btn:hover { background:var(--accent-2); transform:translateY(-1px); }
.primary-btn span { margin-left:12px; }
.primary-btn.compact { min-width:auto; padding:11px 14px; }
.secondary-btn { background:var(--panel); border-color:var(--line); color:var(--text); }
.secondary-btn:hover { border-color:var(--muted); }

.quiz-topline { display:grid; grid-template-columns:150px 1fr 110px; gap:18px; align-items:center; margin-bottom:32px; }
.back-btn { border:0; background:transparent; color:var(--muted); text-align:left; padding:10px 0; }
.quiz-progress-wrap { height:8px; background:var(--panel-2); border-radius:99px; overflow:hidden; }
.quiz-progress { width:0; height:100%; background:var(--accent); border-radius:inherit; transition:width .25s ease; }
.session-counter { text-align:right; color:var(--muted); font-variant-numeric:tabular-nums; }
.quiz-layout { display:grid; grid-template-columns:120px 1fr 120px; }
.session-sidebar { display:flex; flex-direction:column; gap:8px; }
.session-stat { border:1px solid var(--line); border-radius:12px; padding:12px; }
.session-stat small { display:block; color:var(--muted); font-size:10px; margin-bottom:4px; }
.session-stat strong { font-size:20px; }
.quiz-card { grid-column:2; width:min(680px,100%); justify-self:center; text-align:center; background:var(--panel); border:1px solid var(--line); border-radius:26px; padding:34px; box-shadow:var(--shadow); min-height:520px; display:flex; flex-direction:column; align-items:center; }
.quiz-label { color:var(--muted); font-size:13px; font-weight:700; }
.prompt-main { font:800 clamp(90px, 16vw, 150px)/1.2 "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif; letter-spacing:-.04em; margin:30px 0 8px; }
.prompt-main.romaji { font-family:inherit; font-size:clamp(58px, 10vw, 96px); }
.sound-btn { border:1px solid var(--line); background:var(--bg); width:38px; height:38px; border-radius:50%; margin-bottom:24px; }
.answers-grid { width:100%; display:grid; grid-template-columns:repeat(2,1fr); gap:10px; margin-top:auto; }
.answer-btn { min-height:62px; border:1px solid var(--line); background:var(--bg); color:var(--text); border-radius:12px; font-weight:800; font-size:20px; }
.answer-btn.kana-answer { font:700 28px/1 "Yu Gothic", "Hiragino Sans", sans-serif; }
.answer-btn:hover:not(:disabled) { border-color:var(--accent); }
.answer-btn.correct { background:color-mix(in srgb, var(--good) 14%, var(--panel)); border-color:var(--good); color:var(--good); }
.answer-btn.wrong { background:color-mix(in srgb, var(--bad) 12%, var(--panel)); border-color:var(--bad); color:var(--bad); }
.answer-btn:disabled { cursor:default; }
.input-answer { width:100%; display:grid; grid-template-columns:1fr auto; gap:10px; margin-top:auto; }
.input-answer input { width:100%; border:1px solid var(--line); background:var(--bg); color:var(--text); border-radius:12px; padding:16px; font-size:20px; text-align:center; }
.feedback { width:100%; margin-top:18px; padding-top:18px; border-top:1px solid var(--line); display:flex; align-items:center; justify-content:space-between; text-align:left; gap:20px; }
.feedback strong { display:block; }
.feedback span { color:var(--muted); font-size:13px; }
.feedback.good strong { color:var(--good); }
.feedback.bad strong { color:var(--bad); }
.hidden { display:none !important; }

.results-card { width:min(760px,100%); margin:30px auto; text-align:center; background:var(--panel); border:1px solid var(--line); border-radius:28px; box-shadow:var(--shadow); padding:54px 40px; }
.results-card h1 { font-size:64px; }
.result-glyph { font:700 20px/1.2 "Yu Gothic", sans-serif; color:var(--accent); margin-bottom:16px; }
.results-card .hero-text { margin:18px auto 0; }
.result-stats { display:grid; grid-template-columns:repeat(3,1fr); gap:10px; margin:34px 0; }
.result-stats > div { background:var(--bg); border:1px solid var(--line); border-radius:14px; padding:18px; }
.result-stats small { display:block; color:var(--muted); margin-bottom:7px; }
.result-stats strong { font-size:28px; }
.result-actions { display:flex; justify-content:center; gap:10px; }

.page-heading { display:flex; justify-content:space-between; align-items:end; gap:20px; margin-bottom:30px; }
.page-heading h1 { font-size:clamp(42px,6vw,66px); }
.stats-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:12px; margin-bottom:18px; }
.stat-card { padding:22px; border:1px solid var(--line); border-radius:18px; background:var(--panel); }
.stat-card small { display:block; color:var(--muted); margin-bottom:10px; }
.stat-card strong { font-size:34px; letter-spacing:-.04em; }
.mastery-panel, .weak-panel { margin-top:18px; }
.legend { color:var(--muted); font-size:12px; }
.dot { width:8px; height:8px; display:inline-block; border-radius:50%; margin:0 5px 0 12px; }
.dot:first-child { margin-left:0; }
.dot.weak { background:var(--bad); }.dot.good { background:var(--good); }
.mastery-grid { display:grid; grid-template-columns:repeat(10,1fr); gap:7px; }
.mastery-item { position:relative; min-height:67px; border:1px solid var(--line); background:var(--bg); border-radius:11px; display:flex; flex-direction:column; align-items:center; justify-content:center; overflow:hidden; }
.mastery-item .kana { font:700 23px/1 "Yu Gothic", sans-serif; z-index:1; }
.mastery-item small { color:var(--muted); font-size:9px; margin-top:5px; z-index:1; }
.mastery-fill { position:absolute; left:0; right:0; bottom:0; height:0; background:color-mix(in srgb, var(--good) 16%, transparent); }
.weak-list { display:grid; grid-template-columns:repeat(5,1fr); gap:8px; }
.weak-item { background:var(--bg); border:1px solid var(--line); border-radius:12px; padding:13px; display:flex; align-items:center; gap:12px; }
.weak-item .kana { font:700 30px/1 "Yu Gothic", sans-serif; }
.weak-item div { display:flex; flex-direction:column; }
.weak-item small { color:var(--muted); }
.empty-state { color:var(--muted); grid-column:1/-1; padding:22px 0; }

.settings-panel { padding:8px 24px; }
.setting-row { display:flex; justify-content:space-between; align-items:center; gap:24px; padding:20px 0; border-bottom:1px solid var(--line); }
.setting-row:last-child { border-bottom:0; }
.setting-row strong, .setting-row small { display:block; }
.setting-row small { color:var(--muted); margin-top:5px; }
.switch input { display:none; }
.switch span { display:block; width:48px; height:27px; background:var(--panel-2); border:1px solid var(--line); border-radius:99px; position:relative; transition:.18s; }
.switch span::after { content:""; position:absolute; width:19px; height:19px; top:3px; left:4px; border-radius:50%; background:var(--muted); transition:.18s; }
.switch input:checked + span { background:color-mix(in srgb, var(--accent) 25%, var(--panel)); border-color:var(--accent); }
.switch input:checked + span::after { left:24px; background:var(--accent); }
.install-panel { margin-top:18px; display:flex; justify-content:space-between; gap:30px; align-items:center; }
code { background:var(--panel-2); padding:2px 5px; border-radius:5px; }

footer { min-height:78px; border-top:1px solid var(--line); display:flex; align-items:center; justify-content:space-between; color:var(--muted); font-size:11px; }
.toast { position:fixed; bottom:24px; left:50%; transform:translate(-50%, 20px); background:var(--text); color:var(--bg); border-radius:10px; padding:11px 16px; opacity:0; pointer-events:none; transition:.2s ease; z-index:50; box-shadow:var(--shadow); font-weight:700; font-size:13px; }
.toast.show { opacity:1; transform:translate(-50%,0); }

@media (max-width: 900px) {
  .hero { grid-template-columns:1fr auto; }
  .hero-glyph { width:150px; height:150px; font-size:84px; border-radius:32px; }
  .setup-grid { grid-template-columns:1fr; }
  .mastery-grid { grid-template-columns:repeat(7,1fr); }
  .weak-list { grid-template-columns:repeat(3,1fr); }
  .quiz-layout { grid-template-columns:1fr; }
  .quiz-card { grid-column:1; }
  .session-sidebar { order:2; margin-top:10px; flex-direction:row; justify-content:center; }
  .session-stat { min-width:90px; }
}

@media (max-width: 680px) {
  .app-shell { width:min(100% - 20px,1180px); }
  .topbar { height:76px; }
  .brand-copy small { display:none; }
  .topnav .nav-btn:not(.icon-btn) { font-size:0; width:42px; height:42px; padding:0; }
  .topnav .nav-btn[data-nav="home"]::before { content:"練"; font-size:17px; }
  .topnav .nav-btn[data-nav="stats"]::before { content:"統"; font-size:17px; }
  .page { padding-top:36px; }
  .hero { grid-template-columns:1fr; min-height:0; }
  .hero-glyph { display:none; }
  h1 { font-size:50px; }
  .mode-grid, .kana-groups { grid-template-columns:1fr; }
  .panel { padding:18px; border-radius:16px; }
  .panel-heading.split, .launch-panel, .session-options, .page-heading, .setting-row, .install-panel { align-items:stretch; flex-direction:column; }
  .mini-actions { justify-content:flex-start; }
  .launch-panel { display:flex; }
  .session-options { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
  .session-options > div:first-child { grid-column:1/-1; }
  #question-count { width:100%; }
  .quiz-topline { grid-template-columns:auto 1fr; gap:12px; }
  .session-counter { grid-column:2; grid-row:2; font-size:11px; }
  .quiz-progress-wrap { grid-column:2; }
  .back-btn { grid-row:1/3; }
  .quiz-card { padding:24px 16px; min-height:500px; }
  .answers-grid { grid-template-columns:1fr; }
  .input-answer { grid-template-columns:1fr; }
  .feedback { align-items:stretch; flex-direction:column; }
  .result-stats, .stats-grid { grid-template-columns:repeat(2,1fr); }
  .result-stats > div:last-child { grid-column:1/-1; }
  .results-card { padding:40px 20px; }
  .results-card h1 { font-size:48px; }
  .result-actions { flex-direction:column-reverse; }
  .mastery-grid { grid-template-columns:repeat(5,1fr); }
  .weak-list { grid-template-columns:1fr 1fr; }
  .segmented.compact { min-width:0; width:100%; }
  .small-input { width:100%; }
  footer { gap:10px; }
  footer span:last-child { display:none; }
}

/* Sauvegarde serveur */
.backup-panel { margin-top:18px; }
.backup-badge { padding:7px 9px; border:1px solid var(--line); border-radius:8px; color:var(--muted); font:800 10px/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing:.09em; }
.backup-intro { margin-top:-4px; max-width:760px; }
.backup-controls { display:grid; grid-template-columns:minmax(0,1fr) auto; gap:12px; align-items:end; margin-top:22px; }
.backup-code-wrap label { display:block; color:var(--muted); font-size:11px; font-weight:750; margin-bottom:7px; }
.backup-code-wrap small { display:block; color:var(--muted); font-size:11px; line-height:1.45; margin-top:7px; }
.backup-code-input { width:100%; border:1px solid var(--line); background:var(--bg); color:var(--text); border-radius:12px; padding:14px 15px; font:800 19px/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing:.08em; text-transform:uppercase; }
.backup-code-input::placeholder { color:color-mix(in srgb, var(--muted) 60%, transparent); }
.remember-code { display:flex; gap:9px; align-items:center; width:max-content; max-width:100%; margin-top:14px; color:var(--muted); font-size:12px; }
.remember-code input { accent-color:var(--accent); }
.backup-actions { display:flex; gap:10px; margin-top:22px; flex-wrap:wrap; }
.backup-status { margin-top:16px; padding:12px 14px; background:var(--bg); border:1px solid var(--line); border-radius:10px; color:var(--muted); font-size:12px; }
.backup-status.good { border-color:color-mix(in srgb, var(--good) 55%, var(--line)); color:var(--good); }
.backup-status.bad { border-color:color-mix(in srgb, var(--bad) 55%, var(--line)); color:var(--bad); }
.backup-status.busy { color:var(--text); }

@media (max-width:680px) {
  .backup-controls { grid-template-columns:1fr; }
  .backup-controls .secondary-btn, .backup-actions .primary-btn, .backup-actions .secondary-btn { width:100%; }
  .backup-actions { flex-direction:column; }
}