@font-face{font-family:Noto Sans SC;font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/NotoSansSC-400.ttf) format("truetype")}@font-face{font-family:Noto Sans SC;font-style:normal;font-weight:600;font-display:swap;src:url(/fonts/NotoSansSC-600.ttf) format("truetype")}@font-face{font-family:Noto Sans SC;font-style:normal;font-weight:700;font-display:swap;src:url(/fonts/NotoSansSC-700.ttf) format("truetype")}@font-face{font-family:Space Grotesk;font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/SpaceGrotesk-400.ttf) format("truetype")}@font-face{font-family:Space Grotesk;font-style:normal;font-weight:500;font-display:swap;src:url(/fonts/SpaceGrotesk-500.ttf) format("truetype")}@font-face{font-family:Space Grotesk;font-style:normal;font-weight:600;font-display:swap;src:url(/fonts/SpaceGrotesk-600.ttf) format("truetype")}@font-face{font-family:Space Grotesk;font-style:normal;font-weight:700;font-display:swap;src:url(/fonts/SpaceGrotesk-700.ttf) format("truetype")}:root{--bg: #2b0d0f;--bg-soft: #3b0f12;--card: #24090b;--accent: #f59e0b;--accent-2: #ef4444;--text: #f8e7e1;--muted: #d4a9a1;--success: #34d399;--danger: #fb7185;--shadow: 0 20px 50px rgba(20, 4, 5, .55);--chip: rgba(248, 231, 225, .08)}[data-theme=light]{--bg: #fff7f4;--bg-soft: #ffe6dc;--card: #ffffff;--accent: #f59e0b;--accent-2: #dc2626;--text: #2d0f12;--muted: #7a4b50;--success: #16a34a;--danger: #dc2626;--shadow: 0 20px 40px rgba(120, 64, 64, .2);--chip: rgba(220, 38, 38, .08)}[data-theme=light] .panel{background:linear-gradient(145deg,#fff7f4e6,#ffe6dcf2)}[data-theme=light] select{background:#fff7f4f2;color:var(--text)}[data-theme=light] .option{background:#fff7f4e6}[data-theme=light] .option:hover{background:#ffe6dcf2}[data-theme=light] .explain-panel{background:#f5f5f5eb;border:1px solid rgba(0,0,0,.08)}[data-theme=light] .explain-card{background:#fafafaf2;border:1px solid rgba(0,0,0,.08)}[data-theme=light] .explain-section .label{color:var(--muted)}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(1200px 600px at 10% 10%,rgba(239,68,68,.18),transparent),radial-gradient(900px 500px at 90% 20%,rgba(245,158,11,.18),transparent),var(--bg);color:var(--text);font-family:Space Grotesk,Noto Sans SC,system-ui,sans-serif;display:flex;align-items:center;justify-content:center;padding:40px 20px}.app{width:min(900px,100%);display:grid;gap:24px}header{display:flex;flex-direction:column;gap:8px}.header-row{display:flex;align-items:flex-start;justify-content:center;gap:16px;flex-wrap:wrap}.header-copy{display:grid;gap:6px;text-align:center;justify-items:center;width:100%}.theme-box{padding:10px 12px;border-radius:16px;background:var(--chip);border:1px solid rgba(148,163,184,.2);display:inline-flex;align-items:center;gap:10px;margin-top:4px;min-width:340px;max-width:100%;justify-content:flex-end}.theme-stack{display:flex;flex-direction:column;gap:8px}.theme-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px}.theme-label{font-size:.85rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;font-weight:600}header h1{margin:0;font-size:clamp(2rem,3vw,2.8rem);letter-spacing:-.02em}header p{margin:0;color:var(--muted);font-size:1rem}.panel{background:linear-gradient(145deg,#3b0f12c7,#20080af5);border:1px solid rgba(148,163,184,.2);border-radius:24px;padding:28px;box-shadow:var(--shadow)}.controls{display:flex;flex-wrap:wrap;align-items:center;gap:16px;justify-content:space-between}.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;background:var(--chip);color:var(--text);font-weight:600;font-size:.9rem}select{background:#24090bd9;color:var(--text);border:1px solid rgba(148,163,184,.3);border-radius:12px;padding:10px 14px;font-size:.95rem}.quiz{display:grid;gap:18px}.character{font-family:Noto Sans SC,Space Grotesk,sans-serif;font-size:clamp(5rem,18vw,8rem);text-align:center;letter-spacing:.05em;line-height:1;margin:0;display:flex;align-items:center;justify-content:center;width:100%;gap:16px}.character-text{display:inline-block}.speak-button{border:1px solid rgba(148,163,184,.3);background:transparent;color:var(--text);width:44px;height:44px;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.1rem;transition:transform .2s ease,border .2s ease,background .2s ease}.speak-button:hover{border-color:#f59e0b99;background:#f59e0b1a;transform:translateY(-1px)}.speak-button:active,.speak-button.active{border-color:#f59e0be6;background:#f59e0b2e;transform:translateY(0)}.speak-button:disabled{opacity:.5;cursor:not-allowed;transform:none}.prompt-meaning{display:grid;gap:8px;justify-items:center;text-align:center}.prompt-pinyin{font-size:clamp(2rem,5vw,3rem);font-weight:600}.prompt-english{font-size:clamp(1.1rem,2.5vw,1.6rem);color:var(--muted)}.options{display:grid;gap:12px}.option{width:100%;background:#24090bb3;color:var(--text);border:1px solid rgba(148,163,184,.25);border-radius:16px;padding:14px 18px;font-size:1rem;display:flex;align-items:center;justify-content:space-between;cursor:pointer;transition:transform .2s ease,border .2s ease,background .2s ease;gap:12px}.option:hover{transform:translateY(-2px);border-color:#f59e0b99;background:#24090be6}.option.correct{border-color:#34d399cc;background:#34d39926}.option.wrong{border-color:#fb7185cc;background:#fb71851f}.option-index{width:28px;height:28px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;font-weight:700;background:#94a3b826;color:var(--muted);flex-shrink:0}.option-text{display:flex;justify-content:space-between;gap:12px;width:100%}.option.correct .option-index{background:#34d39933;color:var(--success)}.option.wrong .option-index{background:#fb718533;color:var(--danger)}.meta{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;color:var(--muted);font-size:.95rem}.keyboard-hint{color:var(--muted);font-size:.9rem}.status{font-weight:600}.status.correct{color:var(--success)}.status.wrong{color:var(--danger)}.actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center}.toggle{display:inline-flex;align-items:center;gap:8px;font-size:.95rem;color:var(--text)}.toggle input{accent-color:var(--accent-2);width:18px;height:18px}.radio-group{display:inline-flex;align-items:center;gap:10px}.radio-option{display:inline-flex;align-items:center;gap:6px;font-size:.9rem;color:var(--text);cursor:pointer}.radio-option input{accent-color:var(--accent-2);width:16px;height:16px}.meta-row{margin-top:12px;display:flex;justify-content:flex-end}.meta-note{color:var(--muted);font-size:.9rem}.wrongs{display:grid;gap:16px}.wrongs-header{display:flex;justify-content:space-between;align-items:center;font-weight:600}.wrongs-count{color:var(--muted);font-weight:500;font-size:.95rem;display:inline-flex;align-items:center;gap:8px}.wrongs-bar{display:flex;gap:10px;flex-wrap:wrap;min-height:40px;font-size:1.05rem}.wrong-chip{border:1px solid rgba(251,113,133,.6);background:#fb71851a;color:var(--text);border-radius:999px;padding:6px 14px;font-weight:600;cursor:pointer;transition:transform .2s ease,border .2s ease,background .2s ease;font-size:1.15rem}.wrong-chip:hover{transform:translateY(-1px);border-color:#fb7185e6;background:#fb71852e}.wrongs-empty{color:var(--muted);font-size:1.05rem}.footer{text-align:center;color:var(--muted);font-size:.9rem;margin-top:8px}.star-button{border:1px solid rgba(245,158,11,.4);background:transparent;color:var(--text);width:44px;height:44px;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.2rem;transition:transform .2s ease,border .2s ease,background .2s ease}.star-button:hover{border-color:#f59e0bcc;background:#f59e0b1f;transform:translateY(-1px)}.star-button.active{background:#f59e0b2e;border-color:#f59e0bf2}.star-chip{border:1px solid rgba(245,158,11,.6);background:#f59e0b1a;color:var(--text);border-radius:999px;padding:6px 14px;font-weight:600;cursor:pointer;transition:transform .2s ease,border .2s ease,background .2s ease;font-size:1.15rem}.star-chip:hover{transform:translateY(-1px);border-color:#f59e0be6;background:#f59e0b2e}.reset-x{border:1px solid rgba(148,163,184,.35);background:transparent;color:var(--text);border-radius:10px;padding:6px 10px;cursor:pointer;font-weight:600;transition:transform .2s ease,border .2s ease,background .2s ease}.reset-x:hover{transform:translateY(-1px);border-color:#94a3b8b3;background:#f8e7e114}.button{background:linear-gradient(135deg,#f59e0bd9,#ef4444d9);color:#24090b;border:none;border-radius:12px;padding:10px 18px;font-weight:600;cursor:pointer;transition:transform .2s ease,filter .2s ease}.button:hover{transform:translateY(-1px);filter:brightness(1.05)}.button.muted{background:#94a3b81f;color:var(--text);border:1px solid rgba(148,163,184,.25)}.button.muted:hover{filter:none;background:#94a3b833}.explain-panel{margin-top:24px;padding:18px;border-radius:18px;background:#16181cb3;border:1px solid rgba(148,163,184,.18);display:grid;gap:16px;filter:grayscale(1)}.explain-header{display:flex;justify-content:space-between;align-items:center;font-weight:600}.explain-badge{background:var(--chip);color:var(--text);padding:4px 10px;border-radius:999px;font-size:.85rem}.explain-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.explain-card{background:#1e2126b3;border-radius:14px;padding:14px;border:1px solid rgba(148,163,184,.18);display:grid;gap:10px}.explain-char{font-family:Noto Sans SC,Space Grotesk,sans-serif;font-size:2.4rem}.explain-section{display:grid;gap:4px;font-size:.95rem;color:var(--text)}.explain-section .label{color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.08em}.explain-note{color:var(--muted);font-size:.95rem}.explain-note.error{color:var(--danger)}.explain-footnote{font-size:.8rem;color:var(--muted);line-height:1.3}@media(max-width:720px){.panel{padding:22px}.controls{flex-direction:column;align-items:flex-start}.theme-box{min-width:100%}}