:root{--bg: #f7f8fa;--surface: #ffffff;--surface-muted: #f1f3f6;--border: #e5e7eb;--border-strong: #d1d5db;--text: #111827;--text-muted: #6b7280;--text-subtle: #9ca3af;--accent: #4f46e5;--accent-hover: #4338ca;--accent-soft: #eef2ff;--danger: #dc2626;--danger-soft: #fef2f2;--warning: #b45309;--success: #16a34a;--radius: 8px;--radius-sm: 6px;--radius-lg: 12px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 4px 12px rgba(0, 0, 0, .04);--shadow-lg: 0 4px 16px rgba(0, 0, 0, .08), 0 16px 48px rgba(0, 0, 0, .08);--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;overflow:hidden;background:var(--bg);color:var(--text);font-family:var(--font-sans);font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit}input,select,textarea{font-family:inherit;font-size:14px}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border:1px solid var(--border-strong);background:var(--surface);color:var(--text);border-radius:var(--radius);cursor:pointer;font-size:13px;font-weight:500;transition:background .12s ease,border-color .12s ease,color .12s ease}.btn:hover{background:var(--surface-muted)}.btn--primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn--primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}.btn--ghost{background:transparent;border-color:transparent;color:var(--text-muted)}.btn--ghost:hover{background:var(--surface-muted);color:var(--text)}.input{width:100%;padding:9px 12px;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--surface);color:var(--text);outline:none;transition:border-color .12s ease,box-shadow .12s ease}.input:focus{border-color:var(--accent);box-shadow:0 0 0 3px #4f46e526}.select{appearance:none;padding:9px 32px 9px 12px;border:1px solid var(--border-strong);border-radius:var(--radius);background:var(--surface) url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") no-repeat right 10px center;background-size:12px;color:var(--text);cursor:pointer}.markdown{font-size:14px;line-height:1.6;color:var(--text);word-wrap:break-word}.markdown h1,.markdown h2,.markdown h3{margin:1.2em 0 .4em;line-height:1.3}.markdown h1{font-size:1.4em}.markdown h2{font-size:1.2em}.markdown h3{font-size:1.05em}.markdown p{margin:.6em 0}.markdown code{font-family:var(--font-mono);background:var(--surface-muted);padding:1px 5px;border-radius:4px;font-size:.92em}.markdown pre{background:var(--surface-muted);padding:12px 14px;border-radius:var(--radius);overflow-x:auto;font-size:.92em}.markdown pre code{padding:0;background:none}.markdown ul,.markdown ol{padding-left:1.4em;margin:.6em 0}.markdown img{max-width:100%;border-radius:var(--radius-sm)}.markdown blockquote{border-left:3px solid var(--border-strong);margin:.6em 0;padding:0 0 0 12px;color:var(--text-muted)}.markdown table{border-collapse:collapse;margin:.6em 0}.markdown th,.markdown td{border:1px solid var(--border);padding:6px 10px}@keyframes skeleton-shimmer{0%{background-position:-200px 0}to{background-position:calc(200px + 100%) 0}}.skeleton{background:linear-gradient(90deg,var(--surface-muted) 0%,#e9ebef 50%,var(--surface-muted) 100%);background-size:200px 100%;background-repeat:no-repeat;border-radius:4px;animation:skeleton-shimmer 1.2s ease-in-out infinite;display:block}