:root{--color-primary: #a31621;--color-primary-dark: #7a1019;--color-primary-light: #cc1e2b;--color-primary-alpha: rgba(163, 22, 33, .12);--color-secondary: #bfdbf7;--color-secondary-dark: #8ebce8;--color-secondary-alpha: rgba(191, 219, 247, .1);--color-accent: #053c5e;--color-accent-dark: #032535;--color-accent-light: #0a5a8c;--color-bg: #060f18;--color-bg-card: #0c1a28;--color-bg-surface: #0f2030;--color-bg-elevated: #132840;--color-border: rgba(191, 219, 247, .1);--color-border-hover: rgba(191, 219, 247, .22);--color-text-primary: #e8f4fd;--color-text-secondary: #8dafc8;--color-text-muted: #4d7a9b;--color-text-inverse: #ffffff;--color-success: #22c55e;--color-warning: #f59e0b;--color-error: #a31621;--color-info: #bfdbf7;--font-sans: "Poppins", system-ui, sans-serif;--font-mono: "Roboto Mono", "Fira Code", monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-md: 1.125rem;--text-lg: 1.25rem;--text-xl: 1.5rem;--text-2xl: 1.875rem;--text-3xl: 2.25rem;--font-light: 300;--font-regular: 400;--font-medium: 500;--font-semibold: 600;--font-bold: 700;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--shadow-sm: 0 2px 8px rgba(5, 60, 94, .3);--shadow-md: 0 4px 20px rgba(5, 60, 94, .4);--shadow-lg: 0 8px 40px rgba(5, 60, 94, .5);--shadow-glow-primary: 0 0 20px rgba(163, 22, 33, .35);--shadow-glow-accent: 0 0 20px rgba(5, 60, 94, .5);--transition-fast: .15s ease;--transition-base: .25s ease;--transition-slow: .4s ease;--z-base: 1;--z-dropdown: 10;--z-overlay: 20;--z-modal: 30;--z-toast: 40;--sidebar-width: 320px;--header-height: 64px;--chat-max-width: 860px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);font-size:var(--text-base);font-weight:var(--font-regular);line-height:1.6;color:var(--color-text-primary);background-color:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden;height:100dvh}#root{height:100dvh;display:flex;flex-direction:column}img,video{max-width:100%;display:block}button,input,textarea,select{font-family:inherit;font-size:inherit}button{cursor:pointer;border:none;background:none}ul,ol{list-style:none}a{color:inherit;text-decoration:none}p{line-height:1.7}.u-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.u-flex-center{display:flex;align-items:center;justify-content:center}.u-truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-track{background:var(--color-bg-card)}::-webkit-scrollbar-thumb{background:var(--color-accent);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-accent-light)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-16px)}to{opacity:1;transform:translate(0)}}@keyframes pulse-ring{0%{transform:scale(.95);box-shadow:0 0 #a3162180}70%{transform:scale(1);box-shadow:0 0 0 10px #a3162100}to{transform:scale(.95);box-shadow:0 0 #a3162100}}@keyframes typing-dot{0%,80%,to{transform:scale(.7);opacity:.4}40%{transform:scale(1);opacity:1}}@keyframes shimmer{0%{background-position:-600px 0}to{background-position:600px 0}}@keyframes spin{to{transform:rotate(360deg)}}[data-theme=light]{--color-bg: #f0f7ff;--color-bg-card: #ffffff;--color-bg-surface: #e4f0fb;--color-bg-elevated: #d4e8f7;--color-border: rgba(5, 60, 94, .12);--color-border-hover: rgba(5, 60, 94, .28);--color-text-primary: #0b1f30;--color-text-secondary: #2d5a7b;--color-text-muted: #5a8aaa;--color-text-inverse: #ffffff;--shadow-sm: 0 2px 8px rgba(5, 60, 94, .1);--shadow-md: 0 4px 20px rgba(5, 60, 94, .14);--shadow-lg: 0 8px 40px rgba(5, 60, 94, .18);--shadow-glow-primary: 0 0 20px rgba(163, 22, 33, .22);--shadow-glow-accent: 0 0 20px rgba(5, 60, 94, .2)}[data-theme=light] .app:before{background:radial-gradient(ellipse 60% 50% at 10% 0%,rgba(191,219,247,.55) 0%,transparent 70%),radial-gradient(ellipse 40% 40% at 90% 100%,rgba(163,22,33,.08) 0%,transparent 70%)}[data-theme=light] ::-webkit-scrollbar-track{background:var(--color-bg-card)}[data-theme=light] ::-webkit-scrollbar-thumb{background:var(--color-secondary-dark)}[data-theme=light] ::-webkit-scrollbar-thumb:hover{background:var(--color-accent-light)}html{transition:background-color .3s ease,color .3s ease}.app{display:flex;height:100dvh;width:100%;overflow:hidden;background:var(--color-bg);position:relative}.app:before{content:"";position:fixed;inset:0;background:radial-gradient(ellipse 60% 50% at 10% 0%,rgba(5,60,94,.3) 0%,transparent 70%),radial-gradient(ellipse 40% 40% at 90% 100%,rgba(163,22,33,.18) 0%,transparent 70%);pointer-events:none;z-index:0}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);height:100%;background:var(--color-bg-card);border-right:1px solid var(--color-border);display:flex;flex-direction:column;position:relative;z-index:var(--z-base);transition:transform var(--transition-slow)}.sidebar__logo{padding:var(--space-6) var(--space-6) var(--space-4);border-bottom:1px solid var(--color-border);display:flex;align-items:center;gap:var(--space-3)}.sidebar__logo-icon{width:38px;height:38px;background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:var(--shadow-glow-primary)}.sidebar__logo-icon svg{width:20px;height:20px;color:#fff}.sidebar__logo-text{display:flex;flex-direction:column;line-height:1.2}.sidebar__logo-name{font-size:var(--text-md);font-weight:var(--font-bold);color:var(--color-text-primary);letter-spacing:-.02em}.sidebar__logo-tagline{font-size:var(--text-xs);font-weight:var(--font-light);color:var(--color-text-muted);letter-spacing:.06em;text-transform:uppercase}.sidebar__section{padding:var(--space-5) var(--space-4);flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:var(--space-4)}.sidebar__section-title{font-size:var(--text-xs);font-weight:var(--font-semibold);color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.1em;margin-bottom:var(--space-2)}.sidebar__footer{padding:var(--space-4) var(--space-4);border-top:1px solid var(--color-border)}.sidebar__status{display:flex;align-items:center;gap:var(--space-2);font-size:var(--text-xs);color:var(--color-text-muted);padding:var(--space-3) var(--space-3);background:var(--color-bg-surface);border-radius:var(--radius-md)}.sidebar__status-dot{width:8px;height:8px;border-radius:var(--radius-full);background:var(--color-success);flex-shrink:0;animation:pulse-ring 2s infinite}.sidebar__status-dot--offline{background:var(--color-text-muted);animation:none}#btn-close-sidebar{display:none}.upload-zone{border:2px dashed var(--color-border);border-radius:var(--radius-lg);padding:var(--space-6) var(--space-4);text-align:center;cursor:pointer;transition:all var(--transition-base);background:var(--color-bg-surface);position:relative;overflow:hidden}.upload-zone:hover,.upload-zone--dragging{border-color:var(--color-primary);background:var(--color-primary-alpha);transform:translateY(-1px)}.upload-zone--success{border-color:var(--color-success);background:#22c55e14;border-style:solid}.upload-zone__icon{width:44px;height:44px;margin:0 auto var(--space-3);background:var(--color-bg-elevated);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;transition:var(--transition-base)}.upload-zone:hover .upload-zone__icon,.upload-zone--dragging .upload-zone__icon{background:var(--color-primary-alpha);transform:scale(1.08)}.upload-zone__icon svg{width:22px;height:22px;color:var(--color-secondary)}.upload-zone--success .upload-zone__icon svg{color:var(--color-success)}.upload-zone__title{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-text-primary);margin-bottom:var(--space-1)}.upload-zone__subtitle{font-size:var(--text-xs);color:var(--color-text-muted);line-height:1.5}.upload-zone__file-info{margin-top:var(--space-3);padding:var(--space-2) var(--space-3);background:#22c55e1a;border-radius:var(--radius-sm);font-size:var(--text-xs);color:var(--color-success);font-weight:var(--font-medium);display:flex;align-items:center;gap:var(--space-2)}.upload-zone__progress{position:absolute;bottom:0;left:0;height:3px;background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));border-radius:var(--radius-full);transition:width var(--transition-slow)}.upload-zone__input{display:none}.main-panel{flex:1;display:flex;flex-direction:column;height:100%;overflow:hidden;position:relative;z-index:var(--z-base)}.chat-header{height:var(--header-height);min-height:var(--header-height);padding:0 var(--space-6);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--color-border);background:#0c1a28cc;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);position:relative;z-index:var(--z-dropdown)}.chat-header__info{display:flex;align-items:center;gap:var(--space-3)}.chat-header__avatar{width:36px;height:36px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--color-accent),var(--color-accent-light));display:flex;align-items:center;justify-content:center;flex-shrink:0}.chat-header__avatar svg{width:18px;height:18px;color:var(--color-secondary)}.chat-header__title{font-size:var(--text-base);font-weight:var(--font-semibold);color:var(--color-text-primary);letter-spacing:-.01em}.chat-header__subtitle{font-size:var(--text-xs);color:var(--color-text-muted);font-weight:var(--font-light)}.chat-header__actions{display:flex;align-items:center;gap:var(--space-2)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);border-radius:var(--radius-md);font-size:var(--text-sm);font-weight:var(--font-medium);line-height:1;transition:all var(--transition-base);cursor:pointer;border:1px solid transparent;white-space:nowrap;position:relative;overflow:hidden}.btn:after{content:"";position:absolute;inset:0;background:linear-gradient(to bottom,rgba(255,255,255,.05),transparent);pointer-events:none}.btn--primary{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:var(--color-text-inverse);border-color:var(--color-primary-dark);box-shadow:0 2px 8px #a3162159}.btn--primary:hover:not(:disabled){background:linear-gradient(135deg,var(--color-primary-light),var(--color-primary));box-shadow:0 4px 16px #a3162180;transform:translateY(-1px)}.btn--primary:active:not(:disabled){transform:translateY(0)}.btn--ghost{background:transparent;color:var(--color-text-secondary);border-color:var(--color-border)}.btn--ghost:hover:not(:disabled){background:var(--color-bg-elevated);color:var(--color-text-primary);border-color:var(--color-border-hover)}.btn--icon{width:36px;height:36px;padding:0;border-radius:var(--radius-md)}.btn:disabled{opacity:.4;cursor:not-allowed}.btn svg{width:16px;height:16px;flex-shrink:0}.chat-body{flex:1;overflow-y:auto;padding:var(--space-6) var(--space-6);display:flex;flex-direction:column;gap:var(--space-4);scroll-behavior:smooth}.chat-body__empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:var(--space-4);animation:fadeIn var(--transition-slow) ease;padding:var(--space-8)}.chat-body__empty-icon{width:80px;height:80px;background:var(--color-bg-elevated);border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;border:1px solid var(--color-border);margin-bottom:var(--space-2)}.chat-body__empty-icon svg{width:36px;height:36px;color:var(--color-text-muted)}.chat-body__empty-title{font-size:var(--text-xl);font-weight:var(--font-semibold);color:var(--color-text-primary);letter-spacing:-.02em}.chat-body__empty-desc{font-size:var(--text-sm);color:var(--color-text-muted);max-width:340px;line-height:1.8}.chat-body__empty-chips{display:flex;flex-wrap:wrap;gap:var(--space-2);justify-content:center;margin-top:var(--space-2)}.chat-body__chip{padding:var(--space-2) var(--space-4);background:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-full);font-size:var(--text-xs);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-base);font-weight:var(--font-medium)}.chat-body__chip:hover{background:var(--color-primary-alpha);border-color:var(--color-primary);color:var(--color-text-primary);transform:translateY(-1px)}.message{display:flex;gap:var(--space-3);width:100%;animation:fadeInUp .25s ease both}.message--user{flex-direction:row-reverse;justify-content:flex-start}.message--ai{justify-content:flex-start}.message__body{display:flex;flex-direction:column;max-width:72%;min-width:60px}.message--user .message__body{align-items:flex-end}.message--ai .message__body{align-items:flex-start}.message__avatar{width:34px;height:34px;min-width:34px;border-radius:var(--radius-full);flex-shrink:0;display:flex;align-items:center;justify-content:center;margin-top:4px;box-shadow:var(--shadow-sm)}.message--user .message__avatar{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark))}.message--ai .message__avatar{background:linear-gradient(135deg,var(--color-accent),var(--color-accent-light))}.message__avatar svg{width:15px;height:15px;color:#fff}.message__bubble{padding:var(--space-3) var(--space-4);border-radius:var(--radius-lg);line-height:1.75;font-size:var(--text-sm);position:relative;word-break:break-word;white-space:pre-wrap}.message--user .message__bubble{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;border-bottom-right-radius:var(--radius-sm);box-shadow:0 4px 18px #a316214d}.message--ai .message__bubble{background:var(--color-bg-surface);color:var(--color-text-primary);border-bottom-left-radius:var(--radius-sm);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);font-family:var(--font-sans)}.message--ai .message__bubble:before{content:"";position:absolute;inset:0;border-radius:inherit;background:linear-gradient(135deg,rgba(191,219,247,.04) 0%,transparent 60%);pointer-events:none}.message__meta{display:flex;align-items:center;gap:var(--space-2);margin-top:4px;padding:0 var(--space-1)}.message__time{font-size:10px;color:var(--color-text-muted);font-weight:var(--font-light);letter-spacing:.03em}.message__typing{display:flex;align-items:center;gap:5px;padding:var(--space-3) var(--space-4);min-width:60px}.message__typing-dot{width:7px;height:7px;background:var(--color-secondary-dark);border-radius:var(--radius-full);animation:typing-dot 1.4s infinite ease-in-out}.message__typing-dot:nth-child(1){animation-delay:0s}.message__typing-dot:nth-child(2){animation-delay:.18s}.message__typing-dot:nth-child(3){animation-delay:.36s}.input-bar{padding:var(--space-4) var(--space-6);border-top:1px solid var(--color-border);background:#0c1a28e6;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}.input-bar__wrapper{display:flex;align-items:flex-end;gap:var(--space-3);background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--space-3) var(--space-3) var(--space-3) var(--space-5);transition:border-color var(--transition-base),box-shadow var(--transition-base)}.input-bar__wrapper:focus-within{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-alpha)}.input-bar__field{flex:1;background:none;border:none;outline:none;color:var(--color-text-primary);font-size:var(--text-sm);font-weight:var(--font-regular);line-height:1.6;resize:none;max-height:160px;overflow-y:auto;padding:var(--space-1) 0}.input-bar__field::placeholder{color:var(--color-text-muted);font-weight:var(--font-light)}.input-bar__send{width:40px;height:40px;border-radius:var(--radius-lg);background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all var(--transition-base);box-shadow:0 2px 8px #a3162159}.input-bar__send:hover:not(:disabled){background:linear-gradient(135deg,var(--color-primary-light),var(--color-primary));transform:scale(1.05);box-shadow:0 4px 14px #a3162180}.input-bar__send:disabled{opacity:.35;cursor:not-allowed;transform:none}.input-bar__send svg{width:18px;height:18px}.input-bar__hint{text-align:center;font-size:var(--text-xs);color:var(--color-text-muted);margin-top:var(--space-2);font-weight:var(--font-light)}.input-bar__hint kbd{display:inline-block;padding:1px 5px;background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:4px;font-size:10px;font-family:var(--font-mono);color:var(--color-text-secondary)}.toast-container{position:fixed;bottom:var(--space-6);right:var(--space-6);display:flex;flex-direction:column;gap:var(--space-2);z-index:var(--z-toast)}.toast{padding:var(--space-3) var(--space-5);border-radius:var(--radius-md);font-size:var(--text-sm);font-weight:var(--font-medium);display:flex;align-items:center;gap:var(--space-3);animation:fadeInUp .3s ease both;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid transparent;max-width:340px;box-shadow:var(--shadow-md)}.toast--success{background:#22c55e26;border-color:#22c55e4d;color:#86efac}.toast--error{background:#a3162133;border-color:#a3162166;color:#fca5a5}.toast--info{background:#053c5e66;border-color:var(--color-border);color:var(--color-secondary)}.toast svg{width:18px;height:18px;flex-shrink:0}.spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.25);border-top-color:#fff;border-radius:var(--radius-full);animation:spin .7s linear infinite;flex-shrink:0}@media(max-width:1024px)and (min-width:769px){:root{--sidebar-width: 260px}}@media(max-width:768px){:root{--sidebar-width: 0px;--header-height: 56px}.sidebar{position:fixed;left:0;top:0;height:100dvh;width:288px;min-width:288px;transform:translate(-100%);z-index:var(--z-modal);transition:transform var(--transition-slow);box-shadow:none}.sidebar--open{transform:translate(0);box-shadow:var(--shadow-lg)}.sidebar-overlay{position:fixed;inset:0;background:#0000008c;backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px);z-index:calc(var(--z-modal) - 1);animation:fadeIn .2s ease}#btn-toggle-sidebar,#btn-close-sidebar{display:flex!important}.chat-header{padding:0 var(--space-3);gap:var(--space-2)}.chat-header__title{font-size:var(--text-sm)}.chat-header__subtitle{font-size:10px;max-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-body{padding:var(--space-3);gap:var(--space-3)}.message__body{max-width:85%}.input-bar{padding:var(--space-2) var(--space-3)}.input-bar__hint{font-size:9px}.toast-container{bottom:var(--space-4);right:var(--space-3);left:var(--space-3)}.toast{max-width:100%;font-size:var(--text-xs)}.chat-body__empty-title{font-size:var(--text-lg)}.chat-body__empty-chips{flex-direction:column;align-items:center}}@media(max-width:400px){.chat-header__subtitle{display:none}.message__body{max-width:90%}}