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40px;display:flex;flex-direction:column;gap:20px;scroll-behavior:smooth}.chat-messages::-webkit-scrollbar{width:5px}.chat-messages::-webkit-scrollbar-track{background:transparent}.chat-messages::-webkit-scrollbar-thumb{background:#e0e0e0;border-radius:3px}.chat-messages::-webkit-scrollbar-thumb:hover{background:#bbb}.chat-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 24px;color:var(--ink-muted)}.chat-empty-icon{font-size:48px;margin-bottom:16px;opacity:.3}.chat-empty h3{font-family:var(--font-heading);font-size:20px;font-weight:700;color:var(--ink);margin-bottom:8px}.chat-empty p{font-size:14px;color:var(--ink-muted)}.chat-quick{margin-top:28px;width:100%;max-width:560px}.chat-quick-label{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.7px;color:#aaa;margin-bottom:10px}.chat-quick-list{display:flex;flex-direction:column;gap:8px}.chat-quick-btn{padding:10px 16px;background:var(--white);border:1px solid #e5e5e5;border-radius:8px;font-size:13px;color:var(--ink);cursor:pointer;text-align:start;transition:all var(--ease);font-family:var(--font-body)}.chat-quick-btn:hover{background:var(--paper-2);border-color:#ccc}.chat-msg{display:flex;gap:12px;align-items:flex-start;animation:fadeIn .2s ease-out;max-width:800px}.chat-msg-user{flex-direction:row-reverse;align-self:flex-end}.chat-msg-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;flex-shrink:0;letter-spacing:.3px}.chat-msg-user .chat-msg-avatar{background:#111;color:#fff}.chat-msg-ai .chat-msg-avatar{background:#f0f0f0;color:#333;border:1px solid #e0e0e0}.chat-msg-body{max-width:calc(100% - 44px);display:flex;flex-direction:column;gap:6px}.chat-msg-text{padding:12px 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span{font-size:11px;color:#aaa;font-weight:600}.chat-copy-btn{align-self:flex-start;padding:4px 10px;background:transparent;border:1px solid #e5e5e5;border-radius:6px;font-size:11px;font-weight:600;color:var(--ink-muted);cursor:pointer;transition:all var(--ease);font-family:var(--font-body)}.chat-copy-btn:hover{background:var(--paper-2);color:var(--ink)}.chat-msg-time{font-size:10px;color:#ccc;padding:0 4px}.chat-typing{display:flex;gap:5px;align-items:center;padding:14px 16px;background:var(--white);border:1px solid #e5e5e5;border-radius:2px 12px 12px}.chat-typing span{width:7px;height:7px;border-radius:50%;background:#ccc;animation:typing 1.2s infinite}.chat-typing span:nth-child(2){animation-delay:.2s}.chat-typing span:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-5px)}}.chat-input-area{padding:16px 40px 20px;background:var(--white);border-top:1px solid 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var(--ease)}.chat-send-btn:hover:not(:disabled){background:#333}.chat-send-btn:disabled{opacity:.4;cursor:not-allowed}.chat-spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}.chat-input-hint{font-size:11px;color:#ccc;margin-top:6px;padding:0 2px}@media (max-width: 768px){.chat-layout{flex-direction:column;height:auto;min-height:calc(100vh - 64px)}.chat-sidebar{width:100%;border-inline-end:none;border-bottom:1px solid #e5e5e5;flex-direction:row;flex-wrap:wrap;overflow:visible}.sidebar-header{width:100%}.sidebar-section{flex:1;min-width:200px;border-bottom:none;border-inline-end:1px solid #f0f0f0}.sidebar-upload{flex:2}.chat-main{height:60vh}.chat-messages{padding:20px 16px}.chat-input-area{padding:12px 16px 16px}.chat-msg{max-width:100%}}@media (max-width: 480px){.chat-sidebar{flex-direction:column}.sidebar-section{border-inline-end:none;border-bottom:1px solid #f0f0f0}.chat-main{height:55vh}}.app{display:flex;flex-direction:column;min-height:100vh;background:var(--paper)}.main-content{flex:1;animation:fadeIn .3s ease-out}.main-content:has(.chat-layout){overflow:hidden;height:calc(100vh - 64px)}.scroll-to-top{position:fixed;bottom:24px;right:24px;width:40px;height:40px;background:#111;color:var(--white);border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:18px;box-shadow:var(--shadow-md);transition:all var(--ease);opacity:0;pointer-events:none;z-index:200}.scroll-to-top.show{opacity:1;pointer-events:auto}.scroll-to-top:hover{background:#333;transform:translateY(-2px)}:root{--ink: #111111;--ink-light: #333333;--ink-muted: #666666;--ink-faint: #999999;--paper: #ffffff;--paper-2: #f7f7f7;--paper-3: #f0f0f0;--paper-line: #e0e0e0;--accent: #222222;--accent-soft: #f0f0f0;--accent-pale: #f7f7f7;--white: #ffffff;--shadow-xs: 0 1px 2px rgba(0,0,0,.05);--shadow-sm: 0 2px 6px rgba(0,0,0,.07);--shadow-md: 0 4px 12px rgba(0,0,0,.09);--shadow-lg: 0 8px 24px rgba(0,0,0,.11);--radius-sm: 3px;--radius: 6px;--radius-md: 8px;--radius-lg: 12px;--font-body: "Source Sans 3", "Cairo", system-ui, sans-serif;--font-heading: "Source Serif 4", Georgia, serif;--ease: .18s ease}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:72px}html[dir=rtl]{direction:rtl;text-align:right;--font-body: "Cairo", system-ui, sans-serif}html[dir=ltr]{direction:ltr;text-align:left}body{font-family:var(--font-body);background:var(--paper);min-height:100vh;color:var(--ink);line-height:1.65;-webkit-font-smoothing:antialiased;font-size:15px;overflow-x:hidden}.container{max-width:1160px;margin:0 auto;padding:0 24px}button{font-family:inherit;cursor:pointer;border:none;background:none}input,textarea,select{font-family:inherit}a{color:inherit;text-decoration:none;transition:color var(--ease)}img{max-width:100%;height:auto;display:block}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--paper-2)}::-webkit-scrollbar-thumb{background:var(--paper-line);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#aaa}::selection{background:#e0e0e0;color:#111}button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid #333333;outline-offset:2px}button:focus:not(:focus-visible),input:focus:not(:focus-visible),textarea:focus:not(:focus-visible),select:focus:not(:focus-visible){outline:none}@keyframes fadeIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes spin{to{transform:rotate(360deg)}}