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var(--navbar-height))}:root{--primary: #4f46e5;--primary-light: #818cf8;--primary-dark: #3730a3;--secondary: #06b6d4;--success: #22c55e;--warning: #f59e0b;--danger: #ef4444;--info: #3b82f6;--bg: #f8fafc;--bg-card: #ffffff;--bg-code: #1e1e2e;--border: #e2e8f0;--text: #1e293b;--text-muted: #64748b;--text-light: #94a3b8;--radius: 12px;--radius-sm: 6px;--shadow: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--navbar-height: 64px}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:15px;color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}#app{height:100%;display:flex;flex-direction:column}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:var(--radius-sm);border:none;font-size:14px;font-weight:500;cursor:pointer;transition:all .15s;white-space:nowrap;outline:none}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-dark)}.btn-secondary{background:#f1f5f9;color:var(--text);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){background:#e2e8f0}.btn-success{background:var(--success);color:#fff}.btn-success:hover:not(:disabled){background:#16a34a}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover:not(:disabled){background:#dc2626}.btn-sm{padding:5px 12px;font-size:13px}.btn-lg{padding:12px 28px;font-size:16px;border-radius:var(--radius)}.card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);overflow:hidden}.badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;font-weight:500}.badge-easy{background:#dcfce7;color:#16a34a}.badge-medium{background:#fef9c3;color:#ca8a04}.badge-hard{background:#fee2e2;color:#dc2626}.badge-ac{background:#dcfce7;color:#16a34a}.badge-wa{background:#fee2e2;color:#dc2626}.badge-re{background:#ffedd5;color:#ea580c}.badge-tle{background:#fef9c3;color:#ca8a04}.badge-pending{background:#f1f5f9;color:#64748b}.spinner{display:inline-block;width:20px;height:20px;border:2px solid #e2e8f0;border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.form-group{margin-bottom:16px}.form-label{display:block;font-size:14px;font-weight:500;margin-bottom:6px;color:var(--text)}.form-control{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;outline:none;transition:border-color .15s;background:#fff}.form-control:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51a}.page-container{max-width:1200px;margin:0 auto;padding:24px 16px}.divider{border:none;border-top:1px solid var(--border);margin:16px 0}.text-muted{color:var(--text-muted)}.text-sm{font-size:13px}.text-center{text-align:center}.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mb-1{margin-bottom:8px}.mb-2{margin-bottom:16px}.flex{display:flex}.flex-center{display:flex;align-items:center;justify-content:center}.gap-1{gap:8px}.gap-2{gap:16px}.w-full{width:100%}.toast{position:fixed;top:calc(var(--navbar-height) + 16px);right:16px;z-index:9999;display:flex;flex-direction:column;gap:8px}.toast-item{padding:12px 20px;border-radius:var(--radius-sm);color:#fff;font-size:14px;box-shadow:var(--shadow-lg);animation:slideIn .2s ease}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.toast-success{background:var(--success)}.toast-error{background:var(--danger)}.toast-info{background:var(--info)}.markdown-body h1,.markdown-body h2,.markdown-body h3{margin:16px 0 8px;font-weight:600}.markdown-body p{margin-bottom:12px;line-height:1.75}.markdown-body code{background:#f1f5f9;padding:2px 6px;border-radius:4px;font-size:13px;font-family:Cascadia Code,Fira Code,monospace}.markdown-body pre{background:#1e1e2e;color:#cdd6f4;padding:16px;border-radius:var(--radius-sm);overflow-x:auto;margin:12px 0}.markdown-body pre code{background:none;color:inherit;padding:0}.markdown-body ul,.markdown-body ol{padding-left:24px;margin-bottom:12px}.markdown-body li{margin-bottom:4px}