:root{--bg: #fff8ef;--ink: #2d2a26;--muted: #8a8077;--accent: #ff7a59;--accent-ink: #ffffff;--card: #ffffff;--border: #f0e4d4;--grid-line: #e0a596;--stroke-current: #e5484d;--stroke-done: #cfc6b8;--good: #4caf82;--danger: #e2574c;--font-kai: "Kaiti SC", "KaiTi", "STKaiti", "楷体", "BiauKai", serif;color-scheme:light}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,PingFang SC,Microsoft YaHei,system-ui,sans-serif}button{font-family:inherit}.app{min-height:100%;display:flex;flex-direction:column}.login-screen{flex:1;display:flex;align-items:center;justify-content:center;padding:24px}.login-card{width:100%;max-width:360px;background:var(--card);border-radius:20px;padding:32px 24px;box-shadow:0 10px 30px #0000000f;text-align:center}.login-card h1{font-size:24px;margin:0 0 8px}.login-card p.sub{color:var(--muted);margin:0 0 24px;font-size:14px}.login-card input{width:100%;font-size:18px;padding:14px 16px;border-radius:12px;border:1px solid var(--border);margin-bottom:12px;text-align:center}.login-card button.primary{width:100%;font-size:18px;font-weight:600;padding:14px;border-radius:12px;border:none;background:var(--accent);color:var(--accent-ink);cursor:pointer}.login-card button.primary:disabled{opacity:.5}.login-card .error{color:var(--danger);font-size:14px;margin:8px 0 0}.login-card .link{margin-top:16px;font-size:14px;color:var(--muted);background:none;border:none;text-decoration:underline;cursor:pointer}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 20px}.topbar .email{font-size:13px;color:var(--muted)}.topbar nav{display:flex;gap:16px}.topbar nav button{background:none;border:none;font-size:15px;color:var(--muted);cursor:pointer;padding:4px 0}.topbar nav button.active{color:var(--ink);font-weight:600;border-bottom:2px solid var(--accent)}.practice{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:16px 72px;gap:24px;position:relative}.practice.empty{text-align:center;color:var(--muted);gap:16px}.stage-row{display:flex;gap:28px;align-items:flex-start;justify-content:center;flex-wrap:wrap;width:100%}.char-col{display:flex;flex-direction:column;align-items:center;gap:12px;width:100%;max-width:520px}.char-pinyin{font-size:40px;font-weight:600;color:var(--muted);letter-spacing:3px;height:48px}.char-row{display:flex;gap:14px;align-items:flex-start;justify-content:center;flex-wrap:wrap}.char-grid,.stroke-anim{position:relative;width:min(42vw,230px);aspect-ratio:1;box-sizing:border-box;border:3px solid var(--grid-line);border-radius:14px;background:var(--card);display:flex;align-items:center;justify-content:center;overflow:hidden}.stroke-anim-mount{width:100%;height:100%;position:relative}.char-grid .grid-line,.stroke-anim .grid-line{position:absolute;background:var(--grid-line);opacity:.55}.char-grid .grid-line-h,.stroke-anim .grid-line-h{left:0;right:0;top:50%;height:0;border-top:2px dashed var(--grid-line);background:none}.char-grid .grid-line-v,.stroke-anim .grid-line-v{top:0;bottom:0;left:50%;width:0;border-left:2px dashed var(--grid-line);background:none}.char-big{position:relative;font-family:var(--font-kai);font-size:min(28vw,148px);line-height:1;font-weight:500;color:var(--ink);-webkit-user-select:none;user-select:none}.char-progress{font-size:14px;color:var(--muted)}.stroke-breakdown{width:100%}.stroke-breakdown-head{font-size:16px;color:var(--muted);text-align:center;margin-bottom:10px}.stroke-breakdown-row{display:flex;gap:14px;overflow-x:auto;padding:2px 4px 10px;justify-content:flex-start;justify-content:safe center}.stroke-cell{flex:0 0 auto;display:flex;flex-direction:column;align-items:center;gap:6px}.stroke-cell-svg{width:108px;height:108px;background:var(--card);border:2px solid var(--grid-line);border-radius:10px;display:block}.cell-grid-line{stroke:var(--grid-line);stroke-width:10;stroke-dasharray:26 22;opacity:.5}.stroke-done{fill:var(--stroke-done)}.stroke-current{fill:var(--stroke-current)}.stroke-cell-label{font-size:15px;color:var(--muted);white-space:nowrap}.word-col{display:flex;flex-direction:column;gap:10px;width:min(100%,220px);padding-top:4px}.word-item{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:8px 16px;display:flex;flex-direction:column;gap:2px}.word-item.empty{color:var(--muted);text-align:center;font-size:15px;opacity:.7}.word-item-pinyin{font-size:13px;color:var(--muted);letter-spacing:1px;min-height:16px}.word-item-text{font-family:var(--font-kai);font-size:30px;display:flex;align-items:baseline;gap:8px}.word-item.idiom{background:#fff1e8;border-color:var(--accent)}.idiom-badge{font-family:-apple-system,PingFang SC,sans-serif;font-size:12px;font-weight:600;color:var(--accent);background:var(--card);border:1px solid var(--accent);border-radius:999px;padding:1px 8px;white-space:nowrap}.edge-btn{position:fixed;top:50%;transform:translateY(-50%);z-index:5;display:flex;flex-direction:column;align-items:center;gap:2px;border:none;background:var(--card);box-shadow:0 4px 14px #00000014;color:var(--ink);font-size:14px;font-weight:600;padding:18px 12px;cursor:pointer}.edge-btn-left{left:0;border-radius:0 16px 16px 0}.edge-btn-right{right:0;border-radius:16px 0 0 16px}.edge-btn:disabled{opacity:.3;cursor:default}.edge-arrow{font-size:30px;line-height:1}@media(max-width:480px){.edge-btn{padding:14px 6px}.edge-btn .edge-label{display:none}.practice{padding-left:46px;padding-right:46px}}.nav-btn{border:none;background:var(--card);box-shadow:0 4px 14px #0000000f;border-radius:999px;padding:16px 28px;font-size:18px;font-weight:600;color:var(--ink);cursor:pointer;white-space:nowrap}@media(max-width:420px){.nav-btn{padding:14px 16px;font-size:16px}}.nav-btn:disabled{opacity:.35;cursor:default}.mic-btn{width:84px;height:84px;border-radius:50%;border:none;background:var(--accent);color:var(--accent-ink);font-size:34px;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 6px 20px #ff7a5966;transition:transform .1s ease}.mic-btn.recording{background:var(--danger);transform:scale(1.12)}.voice-hint{font-size:14px;color:var(--muted);min-height:20px;text-align:center}.add-panel{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000059;display:flex;align-items:center;justify-content:center;padding:20px}.add-panel .box{background:var(--card);border-radius:20px;padding:24px;width:100%;max-width:420px}.add-panel h2{margin:0 0 12px;font-size:18px}.add-panel textarea{width:100%;min-height:120px;font-size:22px;padding:12px;border-radius:12px;border:1px solid var(--border);resize:vertical}.add-panel .actions{display:flex;gap:10px;margin-top:12px;justify-content:flex-end}.add-panel button{border:none;border-radius:10px;padding:10px 18px;font-size:15px;cursor:pointer}.add-panel button.cancel{background:var(--bg);color:var(--muted)}.add-panel button.confirm{background:var(--accent);color:var(--accent-ink);font-weight:600}.fab{position:fixed;right:20px;bottom:20px;width:52px;height:52px;border-radius:50%;border:none;background:var(--card);box-shadow:0 4px 14px #0000001a;font-size:24px;cursor:pointer}.learned-page{flex:1;padding:24px;max-width:720px;margin:0 auto;width:100%}.learned-page h1{font-size:20px}.learned-count{color:var(--muted);margin-bottom:20px}.learned-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(56px,1fr));gap:10px}.learned-grid .cell{background:var(--card);border:1px solid var(--border);border-radius:10px;aspect-ratio:1;display:flex;align-items:center;justify-content:center;font-size:26px;font-family:var(--font-kai)}