:root{--bg: #f5f6fa;--card: #fff;--ink: #202433;--muted: #687084;--line: #dfe3ed;--accent: #5555c9;--good: #16845b;--bad: #c44747}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 system-ui,sans-serif}header{background:#222640;color:#fff;padding:24px 18px}header>div,main{max-width:1000px;margin:auto}h1{margin:0;font-size:clamp(24px,4vw,34px)}header p{margin:5px 0 0;color:#d9dcf3}main{padding:16px;display:grid;gap:14px}.panel{background:#fff;border:1px solid var(--line);border-radius:15px;padding:17px}.section-title{margin:0}.row{display:flex;gap:9px;align-items:center;flex-wrap:wrap}.between{justify-content:space-between}.tabs{display:flex;gap:8px;flex-wrap:wrap}button,select,input{font:inherit;border:1px solid var(--line);border-radius:10px;padding:9px 12px;background:#fff;color:var(--ink)}button{cursor:pointer}button.primary,.tab.active{background:var(--accent);color:#fff;border-color:var(--accent)}.tab{padding:10px 14px}.muted{color:var(--muted)}.tag{font-size:13px;background:#eeeefe;color:#4545a8;padding:4px 9px;border-radius:99px}.reading{font-size:20px;color:var(--muted);margin-top:12px}.word{font-size:clamp(42px,8vw,68px);font-weight:750;line-height:1.2;margin:8px 0}.meaning{font-size:20px}.example{color:var(--muted);margin:8px 0 14px}.writing-pad{width:100%;height:250px;display:block;border:2px dashed #cbd0df;border-radius:12px;background-image:linear-gradient(#eef0f7 1px,transparent 1px),linear-gradient(90deg,#eef0f7 1px,transparent 1px);background-size:32px 32px;touch-action:none}.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.list{display:grid;grid-template-columns:repeat(auto-fit,minmax(235px,1fr));gap:10px}.vocab{border:1px solid var(--line);border-radius:12px;padding:12px}.kanji{font-size:29px;font-weight:700}.small{font-size:14px;color:var(--muted)}.vocab-example{margin:6px 0}.options{display:grid;gap:8px;margin-top:14px}.options button{text-align:left;font-size:22px}.correct{background:#e9f8f0;border-color:var(--good)}.wrong{background:#fff0f0;border-color:var(--bad)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.stat{padding:11px;background:#f7f7fc;border-radius:10px}.stat b{display:block;font-size:24px}.progress{height:7px;background:#eceef5;border-radius:10px;overflow:hidden;margin:10px 0}.progress div{height:100%;background:var(--accent);width:0;transition:width .25s ease}footer{text-align:center;color:var(--muted);padding:8px 12px 25px}.flash-panel{display:grid;gap:12px}.flash-controls{gap:10px}.flashcard{margin:0;padding:0;border:none;background:transparent;width:100%;min-height:280px;perspective:1200px;cursor:pointer}.flashcard-inner{position:relative;width:100%;min-height:280px;transition:transform .55s cubic-bezier(.4,.2,.2,1);transform-style:preserve-3d}.flashcard.is-flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border:1px solid var(--line);border-radius:16px;padding:24px 20px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;background:linear-gradient(145deg,#fff,#f3f4fb);box-shadow:0 8px 28px #22264014}.flashcard-back{transform:rotateY(180deg);background:linear-gradient(145deg,#f8f8ff,#eceeff)}.flash-label{font-size:13px;color:var(--muted);margin-bottom:8px}.flash-main{font-size:clamp(48px,10vw,72px);font-weight:800;line-height:1.15;color:var(--ink)}.flash-hint{margin-top:12px;font-size:18px}.flash-tip{position:absolute;bottom:14px}.flash-kanji{font-size:clamp(44px,9vw,64px);font-weight:800;margin:8px 0}.flash-reading{font-size:22px;color:var(--muted)}.flash-meaning{font-size:20px;margin-top:6px}.flash-example{max-width:520px;margin-top:14px;line-height:1.45}.flash-progress{display:grid;gap:6px}.stroke-panel{margin:12px 0 4px;padding:14px;border:1px solid var(--line);border-radius:14px;background:#fafbff}.stroke-panel--compact{padding:12px;margin-top:0}.stroke-panel--empty{padding:12px 14px}.stroke-head{align-items:flex-start;margin-bottom:10px}.stroke-char-tabs{display:flex;flex-wrap:wrap;gap:6px}.stroke-char-tabs button{min-width:42px;font-size:20px;font-weight:700;padding:6px 10px}.stroke-char-tabs button.active{background:var(--accent);color:#fff;border-color:var(--accent)}.stroke-body{display:flex;flex-wrap:wrap;gap:16px;align-items:center}.stroke-canvas-wrap{position:relative;flex:0 0 auto}.stroke-canvas{width:200px;height:200px;border:2px solid #dfe3ed;border-radius:12px;background:#fff}.stroke-panel--compact .stroke-canvas{width:160px;height:160px}.stroke-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;background:#ffffffbf;border-radius:12px}.stroke-meta{flex:1;min-width:200px;display:grid;gap:8px;align-content:start}.stroke-actions{margin-top:4px}@media(max-width:560px){main{padding:10px}.panel{padding:13px}.stats{grid-template-columns:1fr 1fr}.writing-pad{height:220px}.flashcard,.flashcard-inner{min-height:260px}}