*{margin:0;padding:0;box-sizing:border-box}:root{--bg-page: #f0f2f5;--bg-card: #ffffff;--bg-nav: #1a1a2e;--bg-key: #ffffff;--bg-key-phil: #e3f2fd;--bg-key-stroke: #e8f5e9;--bg-key-body: #fff3e0;--bg-key-shape: #f3e5f5;--bg-key-special: #eceff1;--bg-key-edit: #f8fbff;--bg-correct: #e8f5e9;--bg-wrong: #ffebee;--bg-active: #e3f2fd;--bg-mode-hover: #bbdefb;--text-primary: #333333;--text-display: #555555;--text-heading: #1a1a2e;--text-secondary: #999999;--text-muted: #aaaaaa;--text-nav: #999999;--text-nav-active: #ffffff;--text-nav-hover: #dddddd;--text-key-cangjie: #1a1a2e;--text-key-en: #999999;--text-correct: #2e7d32;--text-wrong: #c62828;--text-empty: #999999;--text-placeholder: #cccccc;--text-missed-code: #666666;--text-delete: #cccccc;--text-delete-hover: #c62828;--border-default: #cccccc;--border-hover: #666666;--border-correct: #66bb6a;--border-wrong: #ef5350;--border-focus: #90caf9;--border-danger: #ef9a9a;--border-active: #1976d2;--border-separator: #f0f0f0;--accent-blue: #1976d2;--accent-nav: #4fc3f7;--accent-danger: #f44336;--hint-outline: #1565c0;--hint-num: #0d47a1;--key-correct: #a5d6a7;--key-wrong: #ef9a9a;--shadow-card: 0 2px 12px rgba(0, 0, 0, .08);--shadow-key: 0 2px 6px rgba(0, 0, 0, .12);--shadow-key-hover: 0 3px 8px rgba(0, 0, 0, .18);--shadow-key-active: 0 1px 3px rgba(0, 0, 0, .12);--shadow-key-mobile: 0 1px 4px rgba(0, 0, 0, .1);--shadow-focus-ring: 0 0 0 2px rgba(144, 202, 249, .4);--shadow-focus-ring-mobile: 0 0 0 1.5px rgba(144, 202, 249, .4)}[data-theme=dark]{--bg-page: #181a22;--bg-card: #222433;--bg-nav: #0d0f15;--bg-key: #2d3040;--bg-key-phil: #252d3a;--bg-key-stroke: #232d24;--bg-key-body: #332c24;--bg-key-shape: #2d2533;--bg-key-special: #2a2d33;--bg-key-edit: #1e2130;--bg-correct: #1b3a1e;--bg-wrong: #3a1c20;--bg-active: #1a2740;--bg-mode-hover: #1a2a44;--text-primary: #cdd0e0;--text-display: #cdd0e0;--text-heading: #cdd0e0;--text-secondary: #87899e;--text-muted: #6b6e7e;--text-nav: #87899e;--text-nav-active: #e2e4f0;--text-nav-hover: #b8bac8;--text-key-cangjie: #cdd0e0;--text-key-en: #797b8e;--text-correct: #81c784;--text-wrong: #ef9a9a;--text-empty: #6b6e7e;--text-placeholder: #494c5e;--text-missed-code: #797b8e;--text-delete: #494c5e;--text-delete-hover: #ef9a9a;--border-default: #3d4058;--border-hover: #6b6e7e;--border-correct: #4caf50;--border-wrong: #e57373;--border-focus: #5c8db8;--border-danger: #6b3a3a;--border-active: #64b5f6;--border-separator: #2d3040;--accent-blue: #64b5f6;--accent-nav: #4fc3f7;--accent-danger: #e57373;--hint-outline: #64b5f6;--hint-num: #90caf9;--key-correct: #2e4a30;--key-wrong: #5c2a2a;--shadow-card: 0 2px 12px rgba(0, 0, 0, .3);--shadow-key: 0 2px 6px rgba(0, 0, 0, .4);--shadow-key-hover: 0 3px 8px rgba(0, 0, 0, .5);--shadow-key-active: 0 1px 3px rgba(0, 0, 0, .4);--shadow-key-mobile: 0 1px 4px rgba(0, 0, 0, .35);--shadow-focus-ring: 0 0 0 2px rgba(100, 160, 220, .4);--shadow-focus-ring-mobile: 0 0 0 1.5px rgba(100, 160, 220, .4)}body{font-family:Songti 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.15s}.missed-delete-btn:hover{background:var(--bg-wrong);color:var(--text-delete-hover)}.quiz-copy-btn{padding:1px 8px;border:1px solid var(--border-default);border-radius:4px;background:transparent;color:var(--text-secondary);font-size:16px;cursor:pointer;transition:border-color .2s,color .2s}.quiz-copy-btn:hover{border-color:var(--border-hover);color:var(--border-hover)}.quiz-copy-btn.copied{border-color:var(--border-correct);color:var(--border-correct)}.quiz-mode-btn{padding:1px 8px;border:1px solid var(--border-default);border-radius:4px;background:transparent;color:var(--text-secondary);font-size:16px;cursor:pointer;transition:border-color .2s,color .2s,background .2s}.quiz-mode-btn:hover:not(:disabled){border-color:var(--border-hover);color:var(--border-hover)}.quiz-mode-btn.active{border-color:var(--accent-blue);color:var(--accent-blue);background:var(--bg-active)}.quiz-mode-btn:disabled{opacity:.4;cursor:default}.quiz-clear-btn{padding:1px 8px;border:1px solid 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.2s}.keyboard-reset-btn:hover{border-color:var(--accent-danger);color:var(--accent-danger)}.key-scope-off{opacity:.35}@media(max-width:720px){.nav a{padding:10px 8px;font-size:16px}.nav-theme-btn{position:fixed;inset-block-end:16px;inset-inline-end:16px;inset-inline-start:auto;inset-block-start:auto;transform:none;z-index:100;font-size:14px;padding:6px 12px;border-radius:50%;width:44px;height:44px;display:flex;align-items:center;justify-content:center}.quiz-card-left-actions,.quiz-copy-btn{display:none}.practice-page{margin:16px auto;padding:0 2px}.practice-page h1{font-size:20px}.quiz-card{padding:20px 16px;margin-block:16px}.quiz-display{font-size:80px;min-height:120px}.quiz-display 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