:root{--bg:#fff;--surface:#f4f5f7;--surface-hover:#ebeef2;--surface-white:#fff;--ink:#111;--ink-secondary:#555;--ink-tertiary:#8a8a8a;--line:#ced4da;--line-strong:#1e1e1e;--button:#1e1e1e;--danger:#e5484d;--danger-bg:#fdebec;--success:#2f9e44;--success-bg:#ebfbee;--radius:0;--pill:0;--font:"PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--shadow-sm:0 1px 2px #1111110a;--shadow-md:0 8px 24px #1111110f}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--font);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;font-size:15px;line-height:1.6}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit;background:0 0;border:none;font-family:inherit}#app{min-height:100vh}.container{max-width:1120px;margin:0 auto;padding:0 24px}.btn{border-radius:var(--pill);white-space:nowrap;justify-content:center;align-items:center;gap:8px;padding:10px 22px;font-size:15px;font-weight:500;line-height:1.2;transition:opacity .15s,transform 50ms;display:inline-flex}.btn:hover{opacity:.88}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--button);color:#fff}.btn-ghost{color:var(--ink-secondary);border:1px solid var(--line);background:0 0}.btn-lg{padding:14px 30px;font-size:16px}.btn-sm{padding:8px 18px;font-size:14px}.btn-block{width:100%}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.badge{border-radius:var(--pill);white-space:nowrap;align-items:center;padding:2px 10px;font-size:12px;font-weight:500;line-height:1.6;display:inline-flex}.difficulty-easy{color:var(--ink-secondary);background:#f0f0f0}.difficulty-medium{color:var(--ink);background:#e2e2e2}.difficulty-hard{background:var(--button);color:#fff}.type-single{color:var(--ink-secondary);background:#f0f0f0}.type-multiple{color:var(--ink);background:#e2e2e2}.type-fill{background:var(--button);color:#fff}.type-select{color:var(--ink-secondary);background:#f0f0f0}.type-dml{background:var(--button);color:#fff}.field{background:var(--bg);border-radius:var(--radius);border:1px solid #0000;align-items:center;gap:10px;height:48px;padding:0 14px;transition:border-color .15s,background .15s;display:flex}.field:focus-within{border-color:var(--ink);background:var(--surface)}.field-prefix{color:var(--ink-tertiary);-webkit-user-select:none;user-select:none;font-weight:600}.field-input{color:var(--ink);background:0 0;border:none;outline:none;flex:1;font-family:inherit;font-size:15px}.field-input::placeholder{color:var(--ink-tertiary)}.field-error{min-height:18px;color:var(--danger);margin:6px 0 0;font-size:12px}.input{border:1px solid var(--line);background:var(--surface);width:100%;height:44px;color:var(--ink);border-radius:0;outline:none;padding:0 14px;font-family:inherit;font-size:15px;transition:border-color .15s}.input:focus{border-color:var(--ink)}.input::placeholder,.muted{color:var(--ink-tertiary)}.text-secondary{color:var(--ink-secondary)}.submit-error{background:var(--danger-bg);color:var(--danger);border-radius:0;padding:10px 14px;font-size:13px}.empty{text-align:center;color:var(--ink-tertiary);padding:48px 0}.back{color:var(--ink-secondary);align-items:center;margin-bottom:16px;font-size:14px;transition:color .15s;display:inline-flex}.back:hover{color:var(--ink)}.prose{padding:28px}.prose>:first-child{margin-top:0}.prose>:last-child{margin-bottom:0}.prose p{margin:0 0 14px}.prose h1,.prose h2,.prose h3,.prose h4{margin:24px 0 12px;line-height:1.3}.prose h1{font-size:22px}.prose h2{font-size:19px}.prose h3{font-size:17px}.prose ul,.prose ol{margin:0 0 14px;padding-left:22px}.prose li{margin:4px 0}.prose a{color:var(--ink);text-decoration:underline}.prose code{background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:0;padding:2px 6px;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:13px}.prose pre{background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:0;padding:16px;line-height:1.5;overflow-x:auto}.prose pre code{color:inherit;background:0 0;border:none;padding:0;font-size:13px}.prose blockquote{border-left:3px solid var(--line);color:var(--ink-secondary);margin:0 0 14px;padding:4px 16px}.prose table{border-collapse:collapse;margin:0 0 14px}.prose th,.prose td{border:1px solid var(--line);padding:8px 12px}.monaco-editor,.monaco-editor *,.monaco-editor :before,.monaco-editor :after{border-radius:0!important}