:root{--ink:#233746;--muted:#576977;--line:#d9e0df;--paper:#fcfbf8;--cream:#f1efe9;--blue:#2b4a60;--mint:#e6f0ed}
*{box-sizing:border-box}html{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;color:var(--ink);background:var(--cream)}body{margin:0;min-height:100vh}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}
.site-header{background:var(--blue);color:white;padding:15px 18px}.site-header .inner{max-width:790px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:18px}.brand{font-size:11px;letter-spacing:.15em;font-weight:800}.brand small{display:block;letter-spacing:.02em;font-size:10px;font-weight:400;opacity:.86;margin-top:4px}.back{font-size:12px;color:#e2edef}
main{max-width:790px;margin:0 auto;background:var(--paper);min-height:calc(100vh - 110px);padding:30px 30px 56px}h1{font-size:clamp(23px,5vw,33px);font-weight:760;letter-spacing:-.03em;line-height:1.42;margin:7px 0 9px}h2{font-size:17px;border-bottom:1px solid var(--line);padding-bottom:10px;margin:37px 0 17px}.eyebrow{font-size:12px;color:#48677b;font-weight:800;letter-spacing:.1em}.lead{font-size:14px;line-height:1.9;color:#526574}.chapter-tag{display:inline-block;border:1px solid #ccdbd9;border-radius:4px;font-size:11px;padding:5px 9px;margin-top:10px;color:#416267}
.scene{background:var(--mint);font-size:13px;padding:12px 14px;border-left:3px solid #86a9ab;margin:19px 0}.dialogue{border-top:1px solid var(--line);margin:18px 0 24px}.turn{display:grid;grid-template-columns:56px 1fr;column-gap:10px;padding:14px 4px;border-bottom:1px solid var(--line);font-size:15px;line-height:1.65}.who{font-size:12px;font-weight:800;color:#52768c;padding-top:4px}.ja{color:#68777e;font-size:12px;display:block;margin-top:4px}
.track{border:1px solid var(--line);background:#fff;border-radius:9px;padding:19px;margin:13px 0}.track-title{font-size:15px;font-weight:800;margin:0 0 6px}.track p{color:#5f6a71;font-size:13px;line-height:1.6;margin:5px 0}.status{background:#f4f5f4;border-radius:5px;color:#64737c;font-size:12px;font-weight:700;padding:10px 11px;margin-top:13px}.ready audio{width:100%;margin-top:11px}.badge{border:1px solid #c4d2d5;color:#52717a;border-radius:4px;padding:2px 7px;font-size:11px;margin-left:6px}.practice{padding:14px;background:#eff4f2;border-radius:8px;margin-top:12px}details{margin:15px 0;border:1px solid #d5dedc;border-radius:7px;padding:12px 15px}summary{font-size:14px;font-weight:700;cursor:pointer}.practice .turn{font-size:13px;padding:10px 0}.muted-answer{font-weight:700;color:#2b5970}.pager{display:flex;align-items:center;justify-content:space-between;gap:15px;border-top:1px solid #d6ddde;margin-top:48px;padding-top:22px;font-size:13px}.pager a{color:#37677b}.footer{margin-top:40px;text-align:center;color:#89939b;font-size:11px}.controls{margin:24px 0}.input{width:100%;border:1px solid #ccd7d7;border-radius:7px;padding:11px 13px;font:inherit;font-size:15px}.chapters{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:15px 24px;margin-top:19px}.chapter h3{font-size:14px;margin:0 0 10px;color:#31556e;border-bottom:1px solid #dce3e1;padding-bottom:8px}.lesson-link{display:block;font-size:13px;line-height:1.65;padding:8px 3px;border-bottom:1px dotted #dce0df}.num{display:inline-block;color:#6b8a93;font-size:12px;width:42px;font-weight:700}.notice{font-size:12px;color:#697982;border:1px solid #dbe1e0;background:#fafbfa;border-radius:6px;padding:10px 12px;line-height:1.7}.hidden{display:none}
@media(max-width:560px){main{padding:24px 17px 42px}.turn{grid-template-columns:48px 1fr}.site-header .inner{flex-direction:column;align-items:start;gap:6px}.chapter-tag{margin-top:5px}}

/* 音声プレーヤー追加 */
.audio-panel{border:1px solid #d7d1c9;border-radius:16px;background:#f8f6f2;padding:18px;margin:18px 0 22px;}
.audio-panel h2{margin:0 0 8px;font-size:1.2rem;}
.audio-panel p{margin:6px 0 14px;line-height:1.65;}
.play-buttons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-bottom:15px}
.play-btn,.stop-btn{border:1px solid #44546a;border-radius:10px;background:#fff;color:#152840;font-weight:700;font-size:15px;padding:13px 8px;cursor:pointer;line-height:1.5}
.play-btn.active{background:#263c58;color:white}
.play-btn:disabled{opacity:.6;cursor:default}
.stop-btn{background:#eee9e2;color:#5b3627;border-color:#cbbdb0;padding:8px 19px;font-size:14px}
.stop-btn:disabled{opacity:.4}
.playback-state{font-size:14px;background:white;border:1px solid #eee;padding:12px;border-radius:8px;min-height:24px;margin:12px 0!important;}
.voice-settings{margin:14px 0 0;padding-top:12px;border-top:1px solid #dcd7d1}
.voice-settings summary{cursor:pointer;font-weight:700;color:#53647a}
.voice-settings .voice-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0}
.voice-grid label{font-size:13px;color:#596370;display:block}
.voice-grid select{width:100%;font-size:13px;padding:9px 5px;margin-top:4px;border:1px solid #d0d0d0;border-radius:6px;max-width:100%;background:white}
.voice-details{font-size:12px;color:#656565}
.dialogue .turn.playing{background:#fcf0d9;outline:2px solid #d4ad68;border-radius:8px}
.demo-label{display:inline-block;border-radius:5px;background:#ede9dc;color:#675e44;font-size:12px;padding:3px 7px;font-weight:700;vertical-align:middle}
@media(max-width:560px){.play-buttons{grid-template-columns:1fr}.voice-settings .voice-grid{grid-template-columns:1fr}.audio-panel{padding:12px}}

/* v2 - role-play, accessibility and touch targets */
.practice-tools{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px;padding:14px;border:1px solid #d3e0de;border-radius:11px;background:#fff}
.practice-tools label{display:block;font-size:12px;color:#385365;font-weight:700;line-height:1.7}
.practice-tools select{display:block;width:100%;border:1px solid #bfcfcf;border-radius:8px;background:white;padding:11px 8px;margin-top:5px;font:inherit;color:inherit;min-height:43px}
.practice-switches{display:flex;gap:16px;flex-wrap:wrap;margin-top:15px;font-size:13px;line-height:1.6;}
.practice-switches label{display:flex;gap:6px;align-items:center;cursor:pointer}
.practice-switches input{width:17px;height:17px;accent-color:#29536a}
.answer-actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:14px 0}
.answer-actions button,.completion button{border:1px solid #4f7185;background:#fff;color:#244d64;border-radius:9px;padding:11px 14px;font:inherit;font-size:13px;font-weight:700;cursor:pointer;min-height:44px}
.turn .en-wrapper{display:block}
.turn .en-text{display:inline}
.turn button.line-replay{margin-left:8px;vertical-align:middle;border:1px solid #d6deda;border-radius:8px;background:white;color:#396378;cursor:pointer;padding:5px 9px;font-size:12px;min-height:32px}
.turn button.line-replay:focus-visible,.play-btn:focus-visible,.stop-btn:focus-visible{outline:3px solid #cc933c;outline-offset:2px}
body.mode-role .turn.practice-target{background:#eaf4f1;border-radius:8px;border-left:4px solid #5a958d;padding-left:12px}
body.mode-role:not(.answers-visible) .turn.practice-target .en-text{display:none}
body.mode-role:not(.answers-visible) .turn.practice-target .en-wrapper::before{content:'あなたのセリフ：声に出して答えましょう';font-weight:700;color:#35635e;font-size:13px}
body.mode-role:not(.answers-visible) .turn.practice-target button.line-replay{display:none}
body.no-translation .dialogue .ja{display:none}
body.mode-role:not(.answers-visible) .turn.practice-target .ja{display:none}
body.mode-role:not(.answers-visible) .turn.practice-target.playing{outline:2px solid #b9d6cd}
.progressbar{height:7px;background:#e4eeec;border-radius:99px;overflow:hidden;margin:14px 0 8px}
.progressbar>div{height:100%;width:0;background:#3f786e;transition:width .2s linear}
.progress-meta{display:flex;justify-content:space-between;gap:8px;font-size:11px;color:#58716c}
.completion{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:25px;padding:15px;border:1px solid #d5e3de;border-radius:12px;background:#f2f8f5}
.completion button.done{background:#2e685f;color:#fff;border-color:#2e685f}
.completion p{margin:0;color:#446257;font-size:12px}
.site-progress{background:#ebf2ee;border:1px solid #cddbd3;border-radius:11px;padding:15px;margin:15px 0 22px;color:#315649;font-weight:700;font-size:14px}
.lesson-link.completed .num::after{content:' ✓';color:#2e765f}
.page-foot-note{font-size:12px;color:#667880;line-height:1.8;margin-top:20px}
@media(max-width:560px){.practice-tools{grid-template-columns:1fr}.answer-actions{align-items:stretch}.answer-actions button{flex:1}.play-buttons{grid-template-columns:repeat(3,minmax(0,1fr));gap:5px}.play-btn{font-size:12px;padding:12px 2px;min-height:70px}.play-btn br{display:block}}

/* v3: source indicator and reduced-motion accessibility */
.source-state{font-size:12px!important;color:#3e6370;background:#e8efec;border-radius:7px;padding:8px 12px;margin:9px 0!important;font-weight:650}
.play-btn:not(:disabled):hover{background:#eff3f4}
.play-btn.active:hover{background:#263c58}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;scroll-behavior:auto!important}}