:root{--bg: #1a1b22;--surface: #262833;--surface-2: #343745;--border: rgba(255, 255, 255, .12);--border-strong: rgba(255, 255, 255, .2);--ring: rgba(255, 255, 255, .1);--text: #f5f6f8;--text-muted: #b4b6c2;--primary: #38bdf8;--primary-hover: #7dd3fc;--primary-rgb: 56, 189, 248;--accent: #67e8f9;--gradient: linear-gradient(135deg, #38bdf8 0%, #22d3ee 100%);--gradient-soft: linear-gradient(135deg, rgba(56, 189, 248, .18) 0%, rgba(34, 211, 238, .14) 100%);--danger: #fca5a5;--success: #6ee7b7;--header-bg: rgba(26, 27, 34, .8);--shadow-glow: 0 0 0 1px var(--ring), 0 2px 4px rgba(0, 0, 0, .3), 0 12px 28px rgba(0, 0, 0, .25);--shadow-card: 0 0 0 1px var(--ring), 0 2px 8px rgba(0, 0, 0, .25);color-scheme:dark}:root[data-theme=light]{--bg: #fafafa;--surface: #ffffff;--surface-2: #f4f4f6;--border: rgba(0, 0, 0, .08);--border-strong: rgba(0, 0, 0, .14);--ring: rgba(0, 0, 0, .04);--text: #0a0a0a;--text-muted: #6b6b76;--primary: #6366f1;--primary-hover: #4f46e5;--primary-rgb: 99, 102, 241;--accent: #9333ea;--gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);--gradient-soft: linear-gradient(135deg, rgba(99, 102, 241, .08) 0%, rgba(168, 85, 247, .06) 100%);--danger: #dc2626;--success: #16a34a;--header-bg: rgba(250, 250, 250, .78);--shadow-glow: 0 0 0 1px var(--ring), 0 1px 2px rgba(0, 0, 0, .04), 0 8px 24px rgba(0, 0, 0, .06);--shadow-card: 0 0 0 1px var(--ring), 0 1px 2px rgba(0, 0, 0, .03);color-scheme:light}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.5;font-feature-settings:"cv11","ss01","ss03";-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent;overscroll-behavior-y:contain;background-image:radial-gradient(ellipse 80% 50% at 50% -10%,rgba(var(--primary-rgb),.18),transparent 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blur(20px)}.app-title{margin:0;font-size:18px;font-weight:700;text-align:center;letter-spacing:-.02em;background:var(--gradient);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.app-main{flex:1;padding:16px;display:flex;flex-direction:column;gap:16px}.stats{background:var(--surface);border-radius:16px;padding:18px;display:flex;flex-direction:column;gap:14px;box-shadow:var(--shadow-card)}.stats-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}.stat-item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px 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ease}.quiz-controls{display:flex;gap:12px;position:sticky;bottom:16px}.drawer-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;opacity:0;pointer-events:none;transition:opacity .25s ease-out;z-index:90}.drawer-backdrop.open{opacity:1;pointer-events:auto}.drawer{position:fixed;top:0;left:0;height:100%;width:86%;max-width:380px;background:var(--bg);border-right:1px solid var(--border);transform:translate(-100%);transition:transform .28s cubic-bezier(.32,.72,0,1);z-index:100;overflow-y:auto;display:flex;flex-direction:column;gap:20px;padding:0 20px 20px;padding-bottom:max(env(safe-area-inset-bottom),20px);padding-left:max(env(safe-area-inset-left),20px)}.drawer.open{transform:translate(0);box-shadow:20px 0 60px #00000080}.drawer-head{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;margin:0 -20px;padding:max(env(safe-area-inset-top),14px) 20px 12px;background:var(--bg);border-bottom:1px solid var(--border)}.drawer-head 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rgba(var(--primary-rgb),.25);border-radius:14px;padding:16px;display:flex;align-items:center;gap:14px;box-shadow:var(--shadow-card)}.streak-flame{font-size:36px;line-height:1}.streak-text{display:flex;flex-direction:column;gap:2px}.streak-num{font-size:28px;font-weight:700;color:var(--text);line-height:1}.streak-unit{font-size:14px;font-weight:500;color:var(--text-muted)}.streak-tip{font-size:12px;color:var(--text-muted)}.category-list{display:flex;flex-direction:column;gap:12px;padding:16px;background:var(--surface);border-radius:14px;box-shadow:var(--shadow-card)}.category-item{display:flex;flex-direction:column;gap:4px}.category-row{display:flex;justify-content:space-between;font-size:13px}.category-label{color:var(--text)}.category-num{color:var(--text-muted);font-variant-numeric:tabular-nums}.progress-bar.slim{height:4px}.recent-list{display:flex;flex-direction:column;background:var(--surface);border-radius:14px;overflow:hidden;box-shadow:var(--shadow-card)}.recent-item{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid var(--border)}.recent-item:last-child{border-bottom:none}.recent-word{font-size:15px;font-weight:600;color:var(--text)}.recent-zh{font-size:12px;color:var(--text-muted);margin-top:2px}.recent-time{font-size:12px;color:var(--text-muted)}.drawer-footer{margin-top:auto;padding-top:8px;text-align:center}.drawer-footer p{margin:0;font-size:11px;color:var(--text-muted)}.card{background:var(--surface);border-radius:20px;padding:24px;display:flex;flex-direction:column;gap:20px;box-shadow:var(--shadow-glow);position:relative;overflow:hidden}.card:before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.18),transparent);pointer-events:none}:root[data-theme=light] .card:before{display:none}.card-head{border-bottom:1px solid var(--border);padding-bottom:18px}.word-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.word{margin:0;font-size:44px;font-weight:800;letter-spacing:-.035em;line-height:1.05}.meta{display:flex;gap:12px;margin-top:8px;font-size:13px;color:var(--text-muted)}.pos{color:var(--accent);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.08em;padding:3px 8px;background:var(--gradient-soft);border:1px solid var(--border);border-radius:6px}.phonetic{font-family:SF Mono,JetBrains Mono,Menlo,Consolas,monospace;font-size:13px;display:inline-flex;align-items:center}.zh{margin:12px 0 0;font-size:17px;font-weight:500;color:var(--text)}.forms{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}.forms li{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;background:var(--surface-2);border:1px solid var(--border);border-radius:999px;font-size:13px;font-family:SF Mono,JetBrains Mono,Menlo,Consolas,monospace}.form-label{color:var(--text-muted);font-size:11px;text-transform:uppercase;letter-spacing:.05em;font-family:-apple-system,sans-serif}.form-value{color:var(--text);font-weight:600}.mnemonic-block{background:var(--gradient-soft);border-radius:14px;padding:16px 18px;border:1px solid rgba(var(--primary-rgb),.25);position:relative}.mnemonic{margin:0;font-size:15px;line-height:1.65;color:var(--text)}.block{display:flex;flex-direction:column;gap:10px}.block-head{display:flex;align-items:center;justify-content:space-between}.block-title{margin:0;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted)}.muted{font-weight:400;text-transform:none;letter-spacing:0;margin-left:6px}.collocations li{padding:10px 12px;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;margin-bottom:6px;display:flex;flex-direction:column;gap:2px}.colloc-en{font-size:15px;font-family:SF Mono,JetBrains 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2px 8px rgba(var(--primary-rgb),.4)}.primary-btn{flex:1;padding:14px 20px;border-radius:12px;background:var(--gradient);color:#fff;font-size:15px;font-weight:600;letter-spacing:-.01em;box-shadow:0 0 0 1px rgba(var(--primary-rgb),.5),0 6px 20px rgba(var(--primary-rgb),.25);transition:box-shadow .2s,transform .1s,filter .15s}.primary-btn:hover{filter:brightness(1.1);box-shadow:0 0 0 1px rgba(var(--primary-rgb),.6),0 8px 28px rgba(var(--primary-rgb),.35)}.primary-btn:active{transform:scale(.98)}.primary-btn.full{width:100%}.secondary-btn{flex:1;padding:14px 20px;border-radius:12px;background:var(--surface-2);border:1px solid var(--border);color:var(--text);font-size:15px;font-weight:600;letter-spacing:-.01em;transition:background .15s,border-color .15s}.secondary-btn:hover{border-color:var(--border-strong);background:var(--surface)}.secondary-btn:active{background:var(--border)}.star-btn{transition:background .15s,color .15s,transform 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24px}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:stretch;justify-content:center;z-index:100}.modal{width:100%;max-width:600px;height:100vh;height:100dvh;background:var(--surface);border:1px solid var(--border);border-radius:0;overflow-y:auto;box-shadow:0 0 60px #0006;padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}.settings{padding:20px;display:flex;flex-direction:column;gap:18px}.settings-head{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;margin:-20px -20px 4px;padding:14px 20px;background:var(--surface);border-bottom:1px solid var(--border)}.settings-head h2{margin:0;font-size:20px}.setting-row{display:flex;flex-direction:column;gap:8px}.setting-row label{font-size:14px;color:var(--text-muted)}.setting-row input[type=number],.setting-row select{width:100%;padding:11px 14px;background:var(--surface-2);border:1px solid 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.plan-do{background:#22c55e14;border:1px solid rgba(34,197,94,.3);border-radius:12px;padding:16px 18px}.study-plan .plan-do h3{border-bottom:none;padding-bottom:0;margin-bottom:10px}.study-plan .plan-dont{background:#ef444414;border:1px solid rgba(239,68,68,.3);border-radius:12px;padding:16px 18px}.study-plan .plan-dont h3{border-bottom:none;padding-bottom:0;margin-bottom:10px}.study-plan .plan-summary{margin-bottom:8px;padding:18px 20px;border-radius:12px;background:var(--gradient-soft);border:1px solid rgba(var(--primary-rgb),.4)}.study-plan .plan-summary h3{border-bottom:none;padding-bottom:0;margin-bottom:6px}.study-plan .plan-summary p{margin:0;font-size:14px;font-weight:500;line-height:1.7}.danger-zone{margin-top:12px;padding-top:16px;border-top:1px solid var(--border)}.danger-zone h3{margin:0 0 8px;font-size:14px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}@media (min-width: 600px){.modal-backdrop{align-items:center;padding:24px 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.15s}.grammar-note-item:hover{border-color:rgba(var(--primary-rgb),.5);transform:translateY(-1px)}.grammar-note-icon{font-size:26px;flex-shrink:0;width:38px;text-align:center}.grammar-note-text{display:flex;flex-direction:column;gap:2px;flex:1;min-width:0}.grammar-note-title{font-size:15px;font-weight:600}.grammar-note-sub{font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:var(--text-muted);opacity:.85}.grammar-note-summary{margin-top:4px;font-size:12.5px;line-height:1.5;color:var(--text-muted)}.grammar-note-arrow{font-size:22px;opacity:.5;flex-shrink:0}.grammar-note{padding:16px 20px 32px;line-height:1.7}.grammar-note-head{position:sticky;top:0;z-index:10;display:grid;grid-template-columns:32px 1fr 32px;align-items:center;margin:-16px -20px 12px;padding:12px 20px;background:var(--surface);border-bottom:1px solid var(--border)}.grammar-note-head h2{margin:0;text-align:center;font-size:17px}.grammar-error{margin:24px 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var(--border);vertical-align:top;line-height:1.55}.grammar-md th{background:var(--surface-2);font-weight:600;font-size:12.5px}.grammar-md tbody tr:nth-child(2n) td{background:rgba(var(--primary-rgb),.04)}