:root{--ink:#202942;--muted:#74809a;--paper:#f7f8fc;--card:#fff;--blue:#5868ef;--pink:#ff725d;--line:#e4e8f2}*{box-sizing:border-box}body{margin:0;color:var(--ink);font-family:Arial,"Microsoft YaHei",sans-serif;background:radial-gradient(circle at 88% 3%,#e8ebff 0,transparent 25%),radial-gradient(circle at 5% 30%,#fff0e9 0,transparent 20%),var(--paper)}.app{max-width:1050px;margin:auto;padding:42px 28px}.topbar{display:flex;justify-content:space-between;align-items:center;padding:0 2px 28px}.eyebrow{margin:0 0 8px;color:var(--blue);font:700 11px monospace;letter-spacing:.14em}.topbar h1{margin:0;font-size:42px;letter-spacing:-2px}.topbar em{color:var(--pink);font-style:normal}.topbar span,.section-head span,.hint{color:var(--muted);font-size:14px}.topbar span{display:block;margin-top:8px}.start-btn,.next{border:0;border-radius:12px;padding:13px 17px;background:var(--ink);color:#fff;font-weight:700;cursor:pointer;box-shadow:0 10px 20px #20294224}.start-btn b{font-size:18px;margin-left:9px}button{font:inherit;transition:.2s}button:hover{transform:translateY(-2px)}button:focus-visible{outline:3px solid #ffb3aa;outline-offset:2px}nav{display:flex;gap:7px;padding:6px;border:1px solid var(--line);border-radius:15px;background:#fff;box-shadow:0 8px 24px #2029420d}nav button{border:0;background:transparent;color:var(--muted);border-radius:10px;padding:11px 19px;cursor:pointer;font-size:14px}nav button.active{background:var(--ink);color:#fff}.view{padding-top:31px}.section-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:19px}.section-head h2,.view>h2{font-size:31px;margin:0 0 6px}.progress{min-width:160px}.progress small{display:block;color:var(--muted);font-size:11px;margin-bottom:6px}.progress strong{display:block;height:7px;border-radius:9px;background:#e6e9f2;overflow:hidden}.progress i{display:block;width:0;height:100%;background:var(--pink);transition:.25s}.progress b{display:block;text-align:right;color:var(--blue);font-size:11px;margin-top:5px}.kana-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:11px}.kana-grid button{position:relative;min-height:108px;text-align:left;padding:14px;border:1px solid var(--line);border-radius:15px;background:var(--card);cursor:pointer}.kana-grid button:hover,.kana-grid button.learned{border-color:#aab4ff;background:#f8f9ff;box-shadow:0 9px 18px #5667f51b}.kana-grid strong{display:block;font:46px "Noto Serif JP",serif;line-height:1}.kana-grid small{display:block;margin-top:11px;color:var(--muted);font:13px monospace}.kana-grid button::after{content:'播放';position:absolute;right:12px;bottom:12px;color:#a0a9bd;font-size:10px}.status{min-height:22px;margin:17px 0 0;color:var(--pink);font-size:13px}.hint{margin:0}.practice-card{margin-top:19px;max-width:570px;padding:31px;border-radius:20px;border:1px solid var(--line);background:#fff;box-shadow:0 13px 28px #2029420d}.listen{border:0;border-radius:11px;padding:13px 16px;background:#edf0ff;color:var(--blue);font-weight:700;cursor:pointer}.answers{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:23px}.answers button{padding:16px;border:1px solid var(--line);border-radius:11px;background:#fff;color:var(--ink);font:18px monospace;cursor:pointer}.answers button:hover{border-color:var(--blue);background:#f4f5ff}.next{margin-top:12px}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:20px}.guide-grid article{padding:22px;border:1px solid var(--line);border-radius:16px;background:#fff}.guide-grid b{color:var(--pink);font:700 13px monospace}.guide-grid h3{margin:15px 0 9px;font-size:18px}.guide-grid p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}footer{text-align:center;margin-top:35px;color:#96a0b5;font-size:12px}@media(max-width:650px){.app{padding:20px 14px 25px}.topbar{padding-bottom:18px;align-items:start}.topbar h1{font-size:34px}.topbar span{max-width:190px;font-size:12px}.start-btn{padding:11px;font-size:12px}.start-btn b{margin-left:4px}.view{padding-top:21px}nav{position:sticky;top:5px;z-index:2;overflow:auto;scrollbar-width:none}nav::-webkit-scrollbar{display:none}nav button{flex:0 0 auto;padding:10px 14px;font-size:13px}.section-head{align-items:start;gap:14px}.section-head h2,.view>h2{font-size:27px}.progress{min-width:91px;margin-top:10px}.kana-grid{gap:7px}.kana-grid button{min-height:75px;padding:8px;border-radius:11px;text-align:center}.kana-grid strong{font-size:31px}.kana-grid small{margin-top:7px;font-size:11px}.kana-grid button::after{display:none}.practice-card{padding:22px 16px}.guide-grid{grid-template-columns:1fr;gap:10px}.guide-grid article{padding:17px}footer{margin-top:26px}}
.units{display:grid;gap:14px;margin-top:22px}.unit{padding:19px;border:1px solid var(--line);border-radius:17px;background:#fff}.unit h3{margin:0 0 13px;font-size:17px}.unit h3 span{color:var(--blue);font:700 12px monospace;margin-right:9px}.lesson-list{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}.lesson-list button{padding:12px 9px;border:1px solid var(--line);border-radius:10px;background:#fff;text-align:left;cursor:pointer}.lesson-list button:hover{background:#f5f6ff;border-color:#aab4ff}.lesson-list b{display:block;color:var(--pink);font:700 11px monospace;margin-bottom:5px}.lesson-list span{font-size:12px;line-height:1.35}.lesson-detail{margin-top:18px;padding:24px;border-radius:18px;background:#fff;border:1px solid #bfc6ff;box-shadow:0 12px 28px #2029420d}.lesson-detail h3{margin:0;font-size:24px}.lesson-detail>p{color:var(--muted);margin:8px 0 17px}.lesson-detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.lesson-detail-grid div{padding:14px;border-radius:12px;background:#f7f8ff}.lesson-detail-grid b{display:block;color:var(--blue);font-size:12px;margin-bottom:7px}.lesson-detail-grid span{font-size:14px;line-height:1.6}.lesson-detail button{margin-top:14px;border:0;border-radius:10px;padding:10px 14px;background:#ffece8;color:#c95042;font-weight:700;cursor:pointer}@media(max-width:650px){.lesson-list{grid-template-columns:repeat(2,1fr)}.unit{padding:15px}.lesson-detail{padding:18px}.lesson-detail h3{font-size:21px}.lesson-detail-grid{grid-template-columns:1fr}}
.kana-tabs{display:flex;align-items:center;gap:8px;margin:-2px 0 16px}.kana-tabs button{border:1px solid var(--line);background:#fff;color:var(--muted);padding:9px 15px;border-radius:10px;cursor:pointer;font-size:13px}.kana-tabs button.active{background:var(--blue);border-color:var(--blue);color:#fff}.kana-tabs span{margin-left:5px;color:var(--muted);font-size:12px}.kana-grid{display:grid;gap:15px}.kana-group{padding:12px;border:1px solid var(--line);border-radius:15px;background:#fff}.kana-group h3{margin:0 0 10px;color:var(--blue);font-size:13px}.kana-group h3 small{margin-left:8px;color:var(--muted);font-weight:400}.kana-row{display:grid;grid-template-columns:repeat(5,1fr);gap:9px}.kana-row button{position:relative;min-height:84px;text-align:center;padding:10px;border:1px solid var(--line);border-radius:12px;background:var(--card);cursor:pointer}.kana-row button:hover,.kana-row button.learned{border-color:#aab4ff;background:#f8f9ff;box-shadow:0 9px 18px #5667f51b}.kana-row strong{display:block;font:38px "Noto Serif JP",serif;line-height:1}.kana-row small{display:block;margin-top:8px;color:var(--muted);font:12px monospace}.kana-row button::after{content:'播放';position:absolute;right:9px;bottom:8px;color:#a0a9bd;font-size:9px}.units{display:grid;gap:11px;margin-top:22px}.unit{padding:0;border:1px solid var(--line);border-radius:15px;background:#fff;overflow:hidden}.unit summary{list-style:none;padding:17px 19px;cursor:pointer;font-size:17px;font-weight:700}.unit summary::-webkit-details-marker{display:none}.unit summary::after{content:'＋';float:right;color:var(--blue);font-size:20px}.unit[open] summary{border-bottom:1px solid var(--line)}.unit[open] summary::after{content:'－'}.unit h3{margin:0}.unit h3 span{color:var(--blue);font:700 12px monospace;margin-right:9px}.unit .lesson-list{padding:12px 16px 16px}.lesson-list{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}.lesson-list button{padding:12px 9px;border:1px solid var(--line);border-radius:10px;background:#fff;text-align:left;cursor:pointer}.lesson-list button:hover{background:#f5f6ff;border-color:#aab4ff}.lesson-list b{display:block;color:var(--pink);font:700 11px monospace;margin-bottom:5px}.lesson-list span{font-size:12px;line-height:1.35}.lesson-detail{margin-top:18px;padding:24px;border-radius:18px;background:#fff;border:1px solid #bfc6ff;box-shadow:0 12px 28px #2029420d}.lesson-detail h3{margin:0;font-size:24px}.lesson-detail>p{color:var(--muted);margin:8px 0 17px}.lesson-detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.lesson-detail-grid div{padding:14px;border-radius:12px;background:#f7f8ff}.lesson-detail-grid b{display:block;color:var(--blue);font-size:12px;margin-bottom:7px}.lesson-detail-grid span{font-size:14px;line-height:1.6}.lesson-detail button{margin-top:14px;border:0;border-radius:10px;padding:10px 14px;background:#ffece8;color:#c95042;font-weight:700;cursor:pointer}@media(max-width:650px){.lesson-list{grid-template-columns:repeat(2,1fr)}.unit{padding:0}.unit summary{padding:14px}.unit .lesson-list{padding:11px 12px 13px}.lesson-detail{padding:18px}.lesson-detail h3{font-size:21px}.lesson-detail-grid{grid-template-columns:1fr}.kana-tabs{flex-wrap:wrap}.kana-tabs span{width:100%;margin:2px 0 0}.kana-grid{gap:10px}.kana-group{padding:9px}.kana-row{gap:6px}.kana-row button{min-height:67px;padding:6px}.kana-row strong{font-size:29px}.kana-row small{margin-top:5px;font-size:10px}.kana-row button::after{display:none}}