:root{--background: oklch(.94 .002 60);--foreground: oklch(.18 .005 60);--card: oklch(.94 .002 60);--card-foreground: oklch(.18 .005 60);--primary: oklch(.22 .005 60);--primary-foreground: oklch(.94 .002 60);--secondary: oklch(.88 .003 60);--secondary-foreground: oklch(.22 .005 60);--muted: oklch(.88 .003 60);--muted-foreground: oklch(.52 .005 60);--accent: oklch(.88 .003 60);--accent-foreground: oklch(.22 .005 60);--destructive: oklch(.577 .245 27.325);--border: oklch(.85 0 0);--input: oklch(.88 0 0);--ring: oklch(.708 0 0);--chart-1: oklch(.646 .222 41.116);--chart-2: oklch(.58 .04 60);--chart-3: oklch(.398 .07 227.392);--chart-4: oklch(.828 .189 84.429);--chart-5: oklch(.68 .12 75);--bg-primary: var(--background);--bg-secondary: var(--secondary);--bg-tertiary: var(--muted);--input-bg: var(--card);--text-primary: var(--foreground);--text-secondary: var(--muted-foreground);--text-tertiary: color-mix(in oklch, var(--foreground) 45%, var(--background));--msg-user-bg: oklch(.62 .08 75);--msg-user-text: oklch(.98 .002 60);--msg-bot-bg: var(--bg-secondary);--msg-bot-text: var(--card-foreground);--success: var(--chart-2);--error: var(--destructive);--warning: var(--chart-4);--accent-primary: var(--chart-5);--accent-warm: var(--chart-5);--accent-secondary: color-mix(in oklch, var(--accent-primary) 60%, var(--foreground));--accent-glow: color-mix(in oklch, var(--accent-primary) 10%, transparent);--border-accent: color-mix(in oklch, var(--accent-primary) 20%, var(--border));--border-subtle: var(--border);--border-medium: color-mix(in oklch, var(--chart-2) 15%, var(--input));--scrim: oklch(.145 0 0 / 60%);--shadow-1: 0 1px 2px oklch(0 0 0 / 4%);--shadow-2: 0 2px 4px oklch(0 0 0 / 4%), 0 4px 8px oklch(0 0 0 / 4%);--shadow-3: 0 4px 8px oklch(0 0 0 / 4%), 0 8px 16px oklch(0 0 0 / 4%), 0 16px 32px oklch(0 0 0 / 4%);--shadow-4: 0 8px 16px oklch(0 0 0 / 6%), 0 16px 32px oklch(0 0 0 / 6%), 0 32px 64px oklch(0 0 0 / 6%);--shadow-glow: 0 0 40px color-mix(in oklch, var(--accent-primary) 12%, transparent);--ambient-radial: radial-gradient(ellipse at 50% 0%, var(--accent-glow) 0%, transparent 60%);--noise-overlay: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.012'/%3E%3C/svg%3E");--brand-icon-filter: none;--seal-filter: drop-shadow(0 4px 12px rgba(0, 0, 0, .15));--font-display: "Playfair Display", "Georgia", serif;--font-sans: "Instrument Sans", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-serif: "Source Serif 4", "Spectral", "Crimson Pro", "Georgia", serif;--font-mono: "Fira Code", "JetBrains Mono", "SF Mono", "Consolas", "Liberation Mono", monospace;--message-font-family: "Source Serif 4", serif;--message-font-size: 18px;--text-xs: 11px;--text-sm: 12.5px;--text-base: 16px;--text-md: 17px;--text-lg: 19px;--text-xl: 24px;--text-2xl: 32px;--text-3xl: 42px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--space-16: 64px;--ease-out-expo: cubic-bezier(.16, 1, .3, 1);--ease-out-quart: cubic-bezier(.25, 1, .5, 1);--ease-spring: cubic-bezier(.34, 1.56, .64, 1);--ease-smooth: cubic-bezier(.4, 0, .2, 1);--duration-fast: .15s var(--ease-smooth);--duration-base: .28s var(--ease-out-quart);--duration-slow: .42s var(--ease-out-expo);--duration-slower: .6s var(--ease-out-expo)}body[class*=-dark]{--brand-icon-filter: none;--seal-filter: drop-shadow(0 4px 12px rgba(0, 0, 0, .25))}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100dvh;width:100%;font-family:var(--font-sans);font-size:var(--text-base);line-height:1.6;background-color:var(--bg-primary);color:var(--text-primary);overflow:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:background-color .4s var(--ease-out-quart),color .4s var(--ease-out-quart)}*{transition-property:background-color,border-color,color,fill,stroke;transition-duration:.4s;transition-timing-function:var(--ease-out-quart)}*[style*=transition],.message-wrapper,.btn,.icon-btn,.modal,.message-bubble{transition-property:all}h1,h2,h3,h4,.brand-title{font-family:var(--font-display);font-weight:500;line-height:1.2}.message-content{font-family:var(--message-font-family, var(--font-serif));font-size:var(--message-font-size, var(--text-lg));line-height:1.7}.message-wrapper.bot .message-content{font-family:var(--message-font-family, var(--font-serif));font-weight:400;font-size:var(--message-font-size, var(--text-lg));line-height:1.7;letter-spacing:0}.message-wrapper.bot .message-content pre,.message-wrapper.bot .message-content code,.message-wrapper.bot .message-content pre code{font-family:var(--font-mono)!important;font-size:.9em;line-height:1.5}.theme-card input[type=radio]{position:absolute;opacity:0;width:0;height:0}.theme-card:has(input[type=radio]:checked){border-color:var(--accent-primary)!important;box-shadow:0 0 0 1px var(--accent-glow)}.theme-card:has(input[type=radio]:checked) .active-indicator{opacity:1!important;transform:scale(1)!important}.theme-card{border:2px solid var(--border-subtle);border-radius:12px;padding:var(--space-4);cursor:pointer;transition:all var(--duration-base);position:relative;background:var(--bg-secondary)}.theme-card:hover{border-color:var(--accent-primary);transform:translateY(-2px);box-shadow:var(--shadow-2)}#app{display:flex;height:100%;width:100%;position:relative;background:var(--bg-primary)}#app:before{content:"";position:absolute;inset:-50%;background:radial-gradient(ellipse at 20% 30%,color-mix(in oklch,var(--accent-primary) 8%,transparent) 0%,transparent 50%),radial-gradient(ellipse at 80% 70%,color-mix(in oklch,var(--accent-warm) 6%,transparent) 0%,transparent 50%),radial-gradient(ellipse at 50% 50%,color-mix(in oklch,var(--chart-2) 4%,transparent) 0%,transparent 60%);pointer-events:none;opacity:1;z-index:0;animation:ambient-float 60s ease-in-out infinite}@keyframes ambient-float{0%,to{transform:translate(0) rotate(0)}33%{transform:translate(2%,-2%) rotate(1deg)}66%{transform:translate(-2%,2%) rotate(-1deg)}}#app:after{content:"";position:absolute;inset:0;background:var(--noise-overlay);pointer-events:none;opacity:1;z-index:1}#app>*{position:relative;z-index:2}aside#sidebar{width:320px;max-width:320px;min-width:280px;background:color-mix(in oklch,var(--chart-2) 4%,var(--bg-secondary));border-right:1px solid var(--border-subtle);display:flex;flex-direction:column;padding:0;transition:max-width .42s var(--ease-out-expo),min-width .42s var(--ease-out-expo),width .42s var(--ease-out-expo);z-index:20;flex-shrink:0;position:relative;overflow:hidden}.sidebar-content{width:320px;min-width:280px;height:100%;display:flex;flex-direction:column;padding:var(--space-8);overflow-y:auto;overflow-x:hidden;transform-origin:left center;transition:transform .42s var(--ease-out-expo)}aside#sidebar.collapsed{max-width:0;width:0;min-width:0;padding:0;margin:0;border-right-color:transparent}aside#sidebar.collapsed .sidebar-content{transform:scaleX(0)}.sidebar-brand{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-6);padding-bottom:var(--space-5);border-bottom:1px solid var(--border-subtle);min-width:0;flex-shrink:0}.brand-logo{width:36px;height:36px;background:transparent;border-radius:0;display:flex;align-items:center;justify-content:center}.brand-logo img{width:22px;height:22px;display:block;filter:var(--brand-icon-filter)}.brand-title{font-size:var(--text-lg);color:var(--text-primary);letter-spacing:-.02em;white-space:normal;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;line-height:1.2}.new-chat-btn{position:relative;width:100%;background:transparent;border:1px solid color-mix(in oklch,var(--chart-2) 12%,var(--border-medium));color:var(--text-secondary);padding:var(--space-4) var(--space-5);border-radius:14px;cursor:pointer;font-family:var(--font-sans);font-size:var(--text-sm);font-weight:500;display:flex;align-items:center;justify-content:center;gap:var(--space-3);transition:all var(--duration-base);overflow:hidden}.new-chat-btn:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,var(--accent-glow),transparent);opacity:0;transition:opacity var(--duration-base)}.new-chat-btn:hover{border-color:var(--accent-primary);color:var(--accent-primary);transform:translateY(-1px);box-shadow:var(--shadow-2),var(--shadow-glow)}.new-chat-btn:hover:before{opacity:1}.new-chat-btn svg{width:18px;height:18px;transition:transform var(--ease-spring)}.new-chat-btn:hover svg{transform:rotate(90deg)}.chat-history{flex-grow:1;overflow-y:auto;overflow-x:hidden;display:flex;flex-direction:column;gap:var(--space-2);margin-top:var(--space-5);padding-right:var(--space-2);min-width:0}.chat-history::-webkit-scrollbar{width:6px}.chat-history::-webkit-scrollbar-thumb{background:var(--border-medium);border-radius:3px}.chat-history::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}.chat-item{position:relative;padding:var(--space-3) var(--space-4);border-radius:10px;cursor:pointer;color:var(--text-secondary);font-size:var(--text-sm);white-space:normal;overflow:visible;text-overflow:ellipsis;display:flex;justify-content:space-between;align-items:center;transition:all var(--duration-base);border:1px solid transparent;min-width:0;height:auto;flex-direction:column;gap:var(--space-1);padding:var(--space-3);align-items:stretch}.chat-item:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%) scaleY(0);width:3px;height:60%;background:var(--accent-primary);border-radius:2px;transition:transform var(--ease-spring)}.chat-item:hover{background:var(--bg-tertiary);color:var(--text-primary);padding-left:var(--space-5)}.chat-item:hover:before{transform:translateY(-50%) scaleY(1)}.chat-item.active{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid color-mix(in oklch,var(--accent-primary) 25%,var(--border-subtle))}.chat-item.active:before{transform:translateY(-50%) scaleY(1)}.delete-chat-btn{opacity:0;background:none;border:none;color:var(--text-tertiary);cursor:pointer;padding:var(--space-1);border-radius:6px;transition:all var(--duration-fast);display:flex;align-items:center;justify-content:center}.chat-item:hover .delete-chat-btn{opacity:1}.delete-chat-btn:hover{color:var(--error);background:color-mix(in oklch,var(--destructive) 10%,transparent)}.chat-item-header{display:flex;justify-content:space-between;width:100%;align-items:center;min-width:0;flex-shrink:0}.chat-title{font-weight:500;color:var(--text-primary);white-space:normal;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;flex:1;min-width:0;line-height:1.4}.chat-time{font-size:var(--text-xs);color:var(--text-tertiary);margin-left:var(--space-2);font-variant-numeric:tabular-nums;flex-shrink:0;line-height:1.4}.chat-preview{font-size:var(--text-xs);color:var(--text-tertiary);white-space:normal;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;width:100%;opacity:.8;min-height:2.8em;line-height:1.4}.date-header{font-size:11px;font-weight:700;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.08em;padding:var(--space-4) var(--space-2) var(--space-2);margin-top:var(--space-2);position:relative}.date-header:first-child{margin-top:0}.chat-actions{position:absolute;right:var(--space-2);top:var(--space-2);display:flex;gap:var(--space-1);opacity:0;transition:opacity var(--duration-fast);background:var(--bg-tertiary);padding-left:var(--space-2);border-radius:6px;box-shadow:-10px 0 10px -5px var(--bg-tertiary)}.chat-item:hover .chat-actions{opacity:1}.action-btn{background:none;border:none;color:var(--text-tertiary);cursor:pointer;padding:4px;border-radius:4px;display:flex;align-items:center;justify-content:center;transition:all var(--duration-fast)}.action-btn:hover{color:var(--text-primary);background:var(--bg-secondary)}.action-btn.delete:hover{color:var(--error);background:color-mix(in oklch,var(--destructive) 10%,transparent)}.chat-item.loading,.skeleton-chat-item{background:linear-gradient(90deg,color-mix(in oklch,var(--bg-secondary) 100%,transparent) 25%,color-mix(in oklch,var(--bg-tertiary) 100%,transparent),color-mix(in oklch,var(--bg-secondary) 100%,transparent) 75%);background-size:200% 100%;animation:shimmer 1.8s ease-in-out infinite;pointer-events:none}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.message-wrapper.loading .message-bubble{background:linear-gradient(90deg,color-mix(in oklch,var(--msg-bot-bg) 100%,transparent) 25%,color-mix(in oklch,var(--accent-glow) 100%,var(--msg-bot-bg)),color-mix(in oklch,var(--msg-bot-bg) 100%,transparent) 75%);background-size:200% 100%;animation:shimmer 1.8s ease-in-out infinite;min-height:100px}.skeleton-text{height:12px;background:var(--bg-tertiary);border-radius:4px;margin:8px 0;opacity:.6}.skeleton-text:nth-child(1){width:80%}.skeleton-text:nth-child(2){width:95%}.skeleton-text:nth-child(3){width:70%}.empty-state-sidebar{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-8) var(--space-4);text-align:center;color:var(--text-tertiary);gap:var(--space-3);margin-top:var(--space-8)}.empty-state-icon{width:48px;height:48px;color:var(--text-tertiary);opacity:.5;margin-bottom:var(--space-2)}.empty-state-text{font-size:var(--text-sm);font-weight:500;color:var(--text-secondary)}.empty-state-sub{font-size:var(--text-xs);opacity:.7}.sidebar-footer{margin-top:var(--space-5);padding-top:var(--space-5);border-top:1px solid var(--border-subtle)}.sidebar-user{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3);border-radius:12px;transition:background var(--duration-base);cursor:pointer}.sidebar-user:hover{background:var(--bg-tertiary)}.user-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:var(--text-sm);font-weight:500;color:#fff}.user-info{flex:1;min-width:0}.user-name{font-size:var(--text-sm);font-weight:500;color:var(--text-primary);white-space:normal;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical}.user-status{font-size:var(--text-xs);color:var(--text-tertiary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}main{flex-grow:1;display:flex;flex-direction:column;position:relative;background:transparent;z-index:10}header{height:88px;padding:0 var(--space-8);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border-subtle);background:color-mix(in oklch,var(--chart-2) 8%,var(--background));backdrop-filter:blur(20px);position:relative;z-index:15}header:after{content:"";position:absolute;bottom:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--accent-glow),transparent);opacity:.5}.header-left{display:flex;align-items:center;gap:var(--space-5)}.header-right{display:flex;align-items:center;gap:var(--space-3);flex:1;justify-content:flex-end;min-width:0;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding:2px 0}.header-right::-webkit-scrollbar{display:none}.icon-btn{position:relative;background:transparent;border:1px solid transparent;color:var(--text-secondary);cursor:pointer;padding:var(--space-3);border-radius:12px;display:flex;align-items:center;justify-content:center;transition:all var(--duration-base)}.icon-btn:before{content:"";position:absolute;inset:0;border-radius:12px;background:var(--bg-tertiary);opacity:0;transform:scale(.9);transition:all var(--duration-base)}.icon-btn:hover{color:var(--text-primary)}.icon-btn:hover:before{opacity:1;transform:scale(1)}.icon-btn.enabled{color:var(--accent-primary);border-color:var(--accent-primary);background:var(--bg-secondary)}.icon-btn svg{width:20px;height:20px;position:relative;z-index:1}.icon-btn.with-label{flex-direction:column;gap:2px;padding:6px 10px;height:auto;min-width:56px}.icon-label{font-size:10px;font-weight:500;line-height:1.2;letter-spacing:.01em;text-align:center;position:relative;z-index:1}#font-type-select,#font-size-select,#theme-select{padding:var(--space-2) var(--space-4);border-radius:10px;border:1px solid var(--border-medium);background:var(--bg-secondary);color:var(--text-primary);font-family:var(--font-sans);font-size:var(--text-sm);outline:none;cursor:pointer;max-width:200px;transition:all var(--duration-base);appearance:none;background-image:url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235C5C57' stroke-width='2' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;padding-right:32px}#font-type-select:hover,#font-size-select:hover,#theme-select:hover{border-color:var(--accent-primary)}#font-type-select:focus,#font-size-select:focus,#theme-select:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-glow)}#search-chats{width:180px;padding:var(--space-2) var(--space-4);border-radius:10px;border:1px solid var(--border-medium);background:var(--bg-secondary);color:var(--text-primary);font-family:var(--font-sans);font-size:var(--text-sm);outline:none;transition:all var(--duration-base);background-image:url("data:image/svg+xml,%3Csvg width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%235C5C57' stroke-width='2' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:10px center;padding-left:36px}#search-chats::placeholder{color:var(--text-tertiary)}#search-chats:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-glow);width:220px}#messages-container{flex-grow:1;overflow-y:auto;padding:var(--space-12) var(--space-6) 180px;display:flex;flex-direction:column;gap:var(--space-8);scroll-behavior:smooth;position:relative}#messages-container::-webkit-scrollbar{width:10px}#messages-container::-webkit-scrollbar-track{background:transparent;margin:8px 0}#messages-container::-webkit-scrollbar-thumb{background:linear-gradient(180deg,color-mix(in oklch,var(--accent-primary) 40%,var(--border-medium)),color-mix(in oklch,var(--accent-primary) 20%,var(--border-medium)));border-radius:6px;border:2px solid transparent;background-clip:padding-box;transition:all var(--duration-base)}#messages-container::-webkit-scrollbar-thumb:hover{background:linear-gradient(180deg,color-mix(in oklch,var(--accent-primary) 60%,var(--border-medium)),color-mix(in oklch,var(--accent-primary) 40%,var(--border-medium)));border-width:1px}.chat-history::-webkit-scrollbar{width:8px}.chat-history::-webkit-scrollbar-track{background:transparent}.chat-history::-webkit-scrollbar-thumb{background:linear-gradient(180deg,color-mix(in oklch,var(--accent-primary) 30%,var(--border-medium)),color-mix(in oklch,var(--accent-primary) 15%,var(--border-medium)));border-radius:6px;transition:all var(--duration-base)}.chat-history::-webkit-scrollbar-thumb:hover{background:linear-gradient(180deg,color-mix(in oklch,var(--accent-primary) 50%,var(--border-medium)),color-mix(in oklch,var(--accent-primary) 30%,var(--border-medium)))}.message-wrapper{display:flex;flex-direction:column;max-width:1200px;margin:0 auto;width:100%;position:relative;transform:translateY(20px) scale(.98);animation:messageRevealEnhanced .5s var(--ease-out-expo) forwards}.message-wrapper:nth-child(1){animation-delay:0ms}.message-wrapper:nth-child(2){animation-delay:50ms}.message-wrapper:nth-child(3){animation-delay:.1s}.message-wrapper:nth-child(4){animation-delay:.15s}.message-wrapper:nth-child(5){animation-delay:.2s}.message-wrapper:nth-child(n+6){animation-delay:.25s}@media (min-width: 1920px){.message-wrapper{max-width:1400px}}@keyframes messageRevealEnhanced{0%{transform:translateY(20px) scale(.98);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}.message-wrapper.deleting{animation:messageExit .3s var(--ease-out-quart) forwards}@keyframes messageExit{to{transform:translate(-20px) scale(.95);opacity:0;max-height:0;margin:0;padding:0}}.message-wrapper.user{align-items:flex-end;flex-direction:row-reverse;gap:var(--space-3)}.message-wrapper.bot{align-items:flex-start;flex-direction:row;gap:var(--space-3)}.message-avatar{width:36px;height:36px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:14px;font-weight:600;box-shadow:var(--shadow-2);position:relative;overflow:hidden}.message-wrapper.user .message-avatar{background:linear-gradient(135deg,color-mix(in oklch,var(--accent-primary) 100%,transparent),color-mix(in oklch,var(--accent-secondary) 100%,transparent));color:#fff;border:2px solid color-mix(in oklch,var(--accent-primary) 30%,transparent)}.message-wrapper.bot .message-avatar{background:linear-gradient(135deg,color-mix(in oklch,var(--chart-2) 80%,var(--bg-secondary)),color-mix(in oklch,var(--accent-primary) 40%,var(--bg-secondary)));color:var(--text-primary);border:2px solid 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