*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg: #0d0d0d;--color-surface: #181818;--color-surface-2: #222222;--color-surface-3: #2a2a2a;--color-border: #2e2e2e;--color-border-subtle: #1f1f1f;--color-text: #f0f0f0;--color-text-secondary: #8a8a8a;--color-text-muted: #555555;--color-accent: #e8702a;--color-accent-hover: #d4612a;--color-accent-muted: rgba(232, 112, 42, .15);--color-accent-border: rgba(232, 112, 42, .35);--color-success: #22c55e;--color-success-muted: rgba(34, 197, 94, .15);--color-warning: #f59e0b;--color-warning-muted: rgba(245, 158, 11, .15);--color-danger: #ef4444;--color-danger-muted: rgba(239, 68, 68, .15);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 20px;--transition: .15s ease}html,body{min-height:100vh;background-color:var(--color-bg);color:var(--color-text);font-family:-apple-system,BlinkMacSystemFont,Inter,Segoe UI,sans-serif;font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{min-height:100vh;display:flex;flex-direction:column}a{color:var(--color-accent);text-decoration:none;transition:color var(--transition)}a:hover{color:var(--color-accent-hover)}button{cursor:pointer;border:none;outline:none;font-family:inherit;font-size:inherit}input,textarea{font-family:inherit;font-size:inherit;outline:none}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--color-bg)}::-webkit-scrollbar-thumb{background:var(--color-surface-3);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 20px;border-radius:var(--radius-md);font-weight:500;font-size:14px;transition:background-color var(--transition),color var(--transition),opacity var(--transition);cursor:pointer;border:none;white-space:nowrap}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background-color:var(--color-accent);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--color-accent-hover)}.btn-ghost{background-color:transparent;color:var(--color-text-secondary);border:1px solid var(--color-border)}.btn-ghost:hover:not(:disabled){background-color:var(--color-surface-2);color:var(--color-text)}.btn-danger{background-color:var(--color-danger-muted);color:var(--color-danger);border:1px solid rgba(239,68,68,.25)}.btn-danger:hover:not(:disabled){background-color:#ef444440}.form-field{display:flex;flex-direction:column;gap:6px}.form-label{font-size:13px;font-weight:500;color:var(--color-text-secondary)}.form-input{background-color:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text);padding:10px 14px;width:100%;transition:border-color var(--transition),background-color var(--transition)}.form-input:focus{border-color:var(--color-accent);background-color:var(--color-surface-3)}.form-input::placeholder{color:var(--color-text-muted)}.form-input.error{border-color:var(--color-danger)}.error-text{font-size:13px;color:var(--color-danger)}.card{background-color:var(--color-surface);border:1px solid var(--color-border-subtle);border-radius:var(--radius-lg);transition:border-color var(--transition),background-color var(--transition)}.card:hover{border-color:var(--color-border)}.badge{display:inline-flex;align-items:center;padding:3px 8px;border-radius:var(--radius-sm);font-size:12px;font-weight:500}.badge-success{background-color:var(--color-success-muted);color:var(--color-success)}.badge-warning{background-color:var(--color-warning-muted);color:var(--color-warning)}.badge-danger{background-color:var(--color-danger-muted);color:var(--color-danger)}.badge-neutral{background-color:var(--color-surface-3);color:var(--color-text-secondary)}.badge-accent{background-color:var(--color-accent-muted);color:var(--color-accent)}@keyframes spin{to{transform:rotate(360deg)}}.spinner{width:20px;height:20px;border:2px solid var(--color-surface-3);border-top-color:var(--color-accent);border-radius:50%;animation:spin .7s linear infinite;flex-shrink:0}.spinner-lg{width:36px;height:36px;border-width:3px}.page-loader{display:flex;align-items:center;justify-content:center;min-height:200px}.math-content p{margin:0}.math-content p+p{margin-top:6px}.math-content img{max-width:100%;border-radius:6px}.math-content .katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0}