:root,[data-theme=light]{--color-primary: #00539b;--color-primary-light: #0077cc;--color-primary-dark: #003d73;--color-primary-bg: #e8f4fd;--color-primary-soft: #d0e8ff;--color-accent: #f0a030;--color-success: #22c55e;--color-error: #ef4444;--color-warning: #f59e0b;--color-info: #3b82f6;--color-bg: #f5f7fa;--color-bg-alt: #edf0f4;--color-surface: #ffffff;--color-surface-hover: #f8f9fb;--color-surface-secondary: #f0f2f5;--color-border: #e1e4e8;--color-border-light: #eef0f2;--color-text-primary: #1a1a2e;--color-text-secondary: #4a5568;--color-text-muted: #9ca3af;--color-text-inverse: #ffffff;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06);--shadow-md: 0 2px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 4px 24px rgba(0, 0, 0, .12);--shadow-xl: 0 8px 32px rgba(0, 0, 0, .14);--shadow-card: 0 1px 4px rgba(0, 0, 0, .04), 0 4px 16px rgba(0, 0, 0, .06);--shadow-bubble-user: 0 2px 8px rgba(0, 83, 155, .22);--shadow-bubble-assistant: 0 1px 4px rgba(0, 0, 0, .04);--focus-ring: 0 0 0 3px rgba(0, 83, 155, .12);--input-glow: 0 0 0 3px rgba(0, 83, 155, .08), 0 0 20px rgba(0, 83, 155, .06)}[data-theme=dark]{--color-primary: #4da3e0;--color-primary-light: #6db8eb;--color-primary-dark: #2e7fc4;--color-primary-bg: #1a2d40;--color-primary-soft: #1e3448;--color-accent: #f0a030;--color-success: #34d399;--color-error: #f87171;--color-warning: #fbbf24;--color-info: #60a5fa;--color-bg: #14181c;--color-bg-alt: #1a1f24;--color-surface: #1c2127;--color-surface-hover: #22272e;--color-surface-secondary: #252a31;--color-border: #2d333b;--color-border-light: #262b32;--color-text-primary: #e6edf3;--color-text-secondary: #8b949e;--color-text-muted: #636c76;--color-text-inverse: #14181c;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .2);--shadow-md: 0 2px 12px rgba(0, 0, 0, .3);--shadow-lg: 0 4px 24px rgba(0, 0, 0, .4);--shadow-xl: 0 8px 32px rgba(0, 0, 0, .45);--shadow-card: 0 1px 4px rgba(0, 0, 0, .15), 0 4px 16px rgba(0, 0, 0, .2);--shadow-bubble-user: 0 2px 8px rgba(77, 163, 224, .25);--shadow-bubble-assistant: 0 1px 3px rgba(0, 0, 0, .15);--focus-ring: 0 0 0 3px rgba(77, 163, 224, .2);--input-glow: 0 0 0 3px rgba(77, 163, 224, .12), 0 0 20px rgba(77, 163, 224, .08)}:root{--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 22px;--radius-full: 9999px;--sidebar-width: 280px;--sidebar-collapsed-width: 64px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .35s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-family);background:var(--color-bg);color:var(--color-text-primary);line-height:1.6;min-height:100vh;overflow:hidden;transition:background var(--transition-normal),color var(--transition-normal)}#app{width:100%;height:100vh;overflow:hidden}a{color:var(--color-primary);text-decoration:none}a:hover{color:var(--color-primary-light)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#c1c9d2;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#a0aab4}[data-theme=dark] ::-webkit-scrollbar-thumb{background:#3a4048}[data-theme=dark] ::-webkit-scrollbar-thumb:hover{background:#4d545d}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}@keyframes messageSlideUp{0%{opacity:0;transform:translateY(12px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes float{0%,to{transform:translateY(0) rotate(0)}25%{transform:translateY(-12px) rotate(2deg)}75%{transform:translateY(8px) rotate(-2deg)}}@keyframes floatReverse{0%,to{transform:translateY(0) rotate(0)}25%{transform:translateY(10px) rotate(-2deg)}75%{transform:translateY(-8px) rotate(2deg)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}@keyframes glowPulse{0%,to{box-shadow:0 0 #00539b00}50%{box-shadow:0 0 0 4px #00539b14}}.animate-fade-in{animation:fadeIn .35s ease}.animate-slide-up{animation:slideUp .4s cubic-bezier(.4,0,.2,1)}.animate-scale-in{animation:scaleIn .35s cubic-bezier(.4,0,.2,1)}.animate-pulse{animation:pulse 2s ease-in-out infinite}.text-center{text-align:center}.text-muted{color:var(--color-text-muted)}.text-secondary{color:var(--color-text-secondary)}.text-primary{color:var(--color-primary)}.text-success{color:var(--color-success)}.text-error{color:var(--color-error)}.text-warning{color:var(--color-warning)}.font-bold{font-weight:600}.mt-2{margin-top:8px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.mb-2{margin-bottom:8px}.mb-4{margin-bottom:16px}.mr-2{margin-right:8px}.ml-2{margin-left:8px}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-2{gap:8px}.gap-4{gap:16px}.flex-1{flex:1}.flex-wrap{flex-wrap:wrap}.w-full{width:100%}.h-full{height:100%}.h-screen{height:100vh}.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 18px;font-size:14px;font-weight:500;font-family:var(--font-family);line-height:1.4;border:1px solid transparent;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;-webkit-user-select:none;user-select:none}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--color-primary);color:var(--color-text-inverse);border-color:var(--color-primary)}.btn-primary:hover:not(:disabled){background:var(--color-primary-light);border-color:var(--color-primary-light)}.btn-secondary{background:var(--color-surface);color:var(--color-text-primary);border-color:var(--color-border)}.btn-secondary:hover:not(:disabled){background:var(--color-surface-hover);border-color:#c1c9d2}[data-theme=dark] .btn-secondary:hover:not(:disabled){border-color:#4d545d}.btn-ghost{background:transparent;color:var(--color-text-secondary);border-color:transparent}.btn-ghost:hover:not(:disabled){background:var(--color-surface-hover);color:var(--color-text-primary)}.btn-sm{padding:4px 12px;font-size:13px}.btn-lg{padding:12px 28px;font-size:16px;border-radius:var(--radius-md)}.btn-block{width:100%}.input{width:100%;padding:10px 14px;font-size:14px;font-family:var(--font-family);color:var(--color-text-primary);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);outline:none;transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.input::placeholder{color:var(--color-text-muted)}.input:focus{border-color:var(--color-primary);box-shadow:var(--focus-ring)}.input-error{border-color:var(--color-error)}.input-error:focus{box-shadow:0 0 0 3px #ef44441f}.chat-bubble{max-width:75%;padding:12px 18px;border-radius:var(--radius-lg);line-height:1.65;word-wrap:break-word;font-size:14px;transition:background var(--transition-normal),box-shadow var(--transition-normal)}.chat-bubble--user{background:linear-gradient(135deg,#00539b,#0070cc);color:var(--color-text-inverse);border-bottom-right-radius:var(--radius-sm);margin-left:auto;box-shadow:var(--shadow-bubble-user)}.chat-bubble--assistant{background:var(--color-surface);color:var(--color-text-primary);border:1px solid var(--color-border);border-bottom-left-radius:var(--radius-sm);box-shadow:var(--shadow-bubble-assistant)}.chat-bubble--error{background:#fef2f2;border-color:#fca5a5;color:#991b1b}[data-theme=dark] .chat-bubble--error{background:#2d1b1b;border-color:#5c2d2d;color:#f87171}[data-theme=dark] .chat-bubble--user{background:linear-gradient(135deg,#2e7fc4,#4da3e0)}.spinner{display:inline-block;width:18px;height:18px;border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .6s linear infinite}.spinner--sm{width:14px;height:14px;border-width:1.5px}.spinner--lg{width:28px;height:28px;border-width:3px}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.suggestion-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:16px;cursor:pointer;transition:all var(--transition-fast)}.suggestion-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-card);transform:translateY(-2px)}