@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700;800&display=swap');
:root{--bg:#f7f7f4;--card:#fff;--text:#202321;--muted:#777b77;--line:#e7e8e3;--accent:#d84b43;--accent2:#f4e5df;--green:#547a61}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:"Noto Sans JP",system-ui,sans-serif}button,input{font:inherit}button{cursor:pointer;border:0}.topbar{height:72px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.9);backdrop-filter:blur(10px);display:flex;align-items:center;padding:0 max(24px,calc((100% - 1120px)/2));gap:30px;position:sticky;top:0;z-index:10}.brand{font-weight:800;font-size:18px;white-space:nowrap}.topbar nav{display:flex;gap:5px;flex:1}.nav-btn{background:none;color:#737773;padding:10px 14px;border-radius:10px}.nav-btn.active,.nav-btn:hover{background:#f0f0ec;color:var(--text)}.streak{font-size:14px;color:#666}.page{display:none;max-width:1120px;margin:auto;padding:64px 24px 90px}.page.active{display:block}.hero{display:grid;grid-template-columns:1.35fr .65fr;gap:40px;align-items:center;padding:50px 0}.eyebrow{letter-spacing:2px;font-size:12px;color:var(--accent);font-weight:800;margin:0 0 12px}.hero h1,.section-head h1,.quiz-wrap h1{font-size:48px;line-height:1.18;margin:0 0 20px;letter-spacing:-2px}.hero h1 span{color:var(--accent)}.hero-text{color:var(--muted);line-height:1.9;max-width:580px}.primary{background:var(--text);color:white;padding:13px 20px;border-radius:10px;margin-top:14px;font-weight:700}.primary:hover{opacity:.85}.secondary{background:white;border:1px solid var(--line);padding:11px 16px;border-radius:10px}.hero-card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:30px;text-align:center;box-shadow:0 15px 40px #2221}.circle{width:150px;height:150px;border-radius:50%;background:var(--accent2);display:grid;place-items:center;margin:0 auto 22px;font-size:34px;font-weight:800;color:var(--accent)}.hero-card p{color:var(--muted);margin:5px}.hero-card strong{font-size:25px}.progress{height:8px;background:#eee;border-radius:20px;margin-top:15px;overflow:hidden}.progress i{display:block;height:100%;width:0;background:var(--accent);transition:.4s}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:16px;overflow:hidden;margin:20px 0 70px}.stats div{background:white;padding:25px;text-align:center}.stats b{display:block;font-size:28px}.stats span{font-size:13px;color:var(--muted)}h2{font-size:24px}.route-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.route{background:white;border:1px solid var(--line);border-radius:16px;padding:20px;display:flex;align-items:center;gap:15px;transition:.2s}.route:hover{transform:translateY(-3px);box-shadow:0 10px 30px #2221}.route>span{width:52px;height:52px;border-radius:13px;background:var(--accent2);display:grid;place-items:center;font-size:25px;font-weight:800;color:var(--accent)}.route b{font-size:15px}.route p{margin:4px 0 0;color:var(--muted);font-size:12px}.route em{margin-left:auto;font-style:normal}.section-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:35px}.section-head h1{font-size:40px;margin-bottom:8px}.section-head p{color:var(--muted)}.kana-tabs{display:flex;gap:8px;margin-bottom:20px}.kana-tab{padding:10px 18px;border-radius:9px;background:#eee;color:#666}.kana-tab.active{background:var(--text);color:#fff}.kana-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:8px}.kana{background:#fff;border:1px solid var(--line);border-radius:10px;padding:13px 4px;text-align:center;font-size:23px;font-weight:700}.kana small{display:block;font-size:10px;color:#999;font-weight:400;margin-top:4px}.kana:hover,.kana.selected{border-color:var(--accent);background:var(--accent2)}.kana-detail{margin-top:25px;padding:22px;border-radius:15px;background:#fff;border:1px solid var(--line);display:flex;align-items:center;gap:22px}.kana-detail>span{font-size:55px;font-weight:800;color:var(--accent)}.kana-detail b{font-size:22px}.kana-detail p{color:var(--muted);margin-bottom:0}.search{background:#fff;border:1px solid var(--line);border-radius:12px;padding:0 15px;display:flex;align-items:center;margin-bottom:20px}.search input{border:0;outline:0;padding:14px;flex:1;background:transparent}.word-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.word{background:#fff;border:1px solid var(--line);border-radius:15px;padding:20px}.word-jp{font-size:27px;font-weight:800}.word-romaji{color:var(--accent);font-size:12px}.word-cn{margin:8px 0 18px}.master{background:#f0f0ec;color:#555;padding:8px 11px;border-radius:8px;font-size:12px}.master.done{background:#e4efe7;color:var(--green)}.quiz-wrap{max-width:650px;margin:0 auto;text-align:center}.quiz-card{margin-top:30px;background:white;border:1px solid var(--line);border-radius:22px;padding:32px}.quiz-num{font-size:12px;color:#999}.quiz-word{font-size:42px;font-weight:800;margin:25px}.options{display:grid;grid-template-columns:1fr 1fr;gap:10px}.option{padding:14px;background:#f5f5f1;border-radius:10px}.option:hover{background:#eaeae4}.option.correct{background:#dfeee4}.option.wrong{background:#f3dddd}.quiz-result{height:25px;margin-top:15px;font-size:13px}.next{margin-top:5px}footer{text-align:center;color:#999;font-size:12px;padding:25px;border-top:1px solid var(--line)}@media(max-width:760px){.topbar{padding:0 15px;gap:10px}.brand{font-size:15px}.topbar nav{overflow:auto}.nav-btn{padding:8px;font-size:12px}.streak{display:none}.page{padding:40px 16px}.hero{grid-template-columns:1fr;padding:20px 0}.hero h1,.section-head h1,.quiz-wrap h1{font-size:36px}.route-grid,.word-grid{grid-template-columns:1fr}.kana-grid{grid-template-columns:repeat(5,1fr)}.section-head{align-items:start;gap:15px}.stats b{font-size:22px}.stats span{font-size:11px}.hero-card{padding:22px}}

.speak-btn{margin-left:auto;background:#f4e5df;color:#c7443c;border:0;padding:11px 15px;border-radius:10px;font-weight:700;white-space:nowrap}.speak-btn:hover{background:#eed8d0}.word .word-jp{cursor:pointer}.word .word-jp:hover{color:var(--accent)}.word .speak-word{margin-left:6px}.quiz-word{cursor:pointer}.quiz-word:hover{color:var(--accent)}
@media(max-width:760px){.kana-detail{flex-wrap:wrap}.speak-btn{margin-left:0}}

/* Audio playback state and cross-device touch usability */
.audio-status{max-width:1120px;margin:0 auto 18px;padding:10px 16px;border-radius:10px;background:#f0f0ec;color:#555;font-size:13px;line-height:1.5}
.audio-status[hidden]{display:none}
.audio-status[data-state="playing"],.audio-status[data-state="success"]{background:#e4efe7;color:#315f43}
.audio-status[data-state="error"]{background:#f8e4e1;color:#9d342b}
.audio-status[data-state="loading"]{background:#fff3dc;color:#795c22}
button,.kana,.option,.speak-btn{touch-action:manipulation;-webkit-tap-highlight-color:transparent}
button:focus-visible,.quiz-word:focus-visible{outline:3px solid #d84b43;outline-offset:3px}
.quiz-word{user-select:none;-webkit-user-select:none}
@media(max-width:760px){.audio-status{margin:0 16px 18px}.kana{min-height:58px}.speak-btn{min-height:42px}.option{min-height:48px}}


/* Persistent volume control: accessible on desktop and touch devices */
.audio-controls{max-width:1120px;margin:14px auto 0;padding:12px 20px;display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:14px}
.audio-volume-icon{font-size:19px;line-height:1}
.audio-controls label{font-size:13px;font-weight:700;white-space:nowrap}
.audio-controls input[type="range"]{flex:1;min-width:70px;accent-color:var(--accent);cursor:pointer;touch-action:pan-y}
.audio-controls output{min-width:48px;text-align:right;font-size:13px;font-weight:800;font-variant-numeric:tabular-nums}
.audio-volume-help{font-size:11px;color:var(--muted);white-space:nowrap}
.audio-controls input:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
@media(max-width:760px){.audio-controls{margin:10px 16px 0;padding:12px;gap:10px;display:grid;grid-template-columns:auto auto 1fr auto;align-items:center}.audio-controls label{font-size:12px}.audio-controls input[type="range"]{grid-column:1 / 4;grid-row:2;width:100%;min-height:30px}.audio-controls output{grid-column:4;grid-row:1}.audio-volume-help{grid-column:1 / -1;grid-row:3;white-space:normal;font-size:10px}}