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:root{--bg:#fafafa;--bg-elevated:#fff;--text:#111827;--text-muted:#6b7280;--text-faint:#9ca3af;--border:#e5e7eb;--border-strong:#d1d5db;--primary:#6d28d9;--primary-dark:#5b21b6;--primary-light:#ede9fe;--accent:#ec4899;--accent-soft:#fce7f3;--success:#10b981;--success-soft:#d1fae5;--danger:#ef4444;--danger-soft:#fee2e2;--warning:#f59e0b;--gradient:linear-gradient(135deg, #7c3aed 0%, #db2777 100%);--gradient-soft:linear-gradient(135deg, #7c3aed14, #db277714);--radius-sm:8px;--radius:12px;--radius-lg:16px;--radius-full:999px;--shadow-sm:0 1px 2px #1118270f;--shadow:0 4px 12px #11182714;--shadow-lg:0 12px 40px #11182724;--font-sans:var(--font-geist-sans), -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono:var(--font-geist-mono), ui-monospace, SFMono-Regular, Menlo, 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8px 22px #7c3aed61}.btn-secondary{background:var(--bg-elevated);color:var(--text);border:1px solid var(--border);box-shadow:var(--shadow-sm)}.btn-secondary:hover:not(:disabled){border-color:var(--border-strong);background:#f3f4f6}.btn-ghost{color:var(--text-muted);background:0 0}.btn-ghost:hover:not(:disabled){color:var(--text);background:#1118270d}.btn-danger{background:var(--danger);color:#fff;box-shadow:0 4px 14px #ef44444d}.btn-danger:hover:not(:disabled){background:#dc2626}.btn-lg{padding:16px 36px;font-size:1.05rem}.btn-sm{padding:8px 16px;font-size:.85rem}.btn-block{width:100%}.site-header{z-index:50;height:var(--header-height);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);background:#ffffffd9;align-items:center;display:flex;position:sticky;top:0}.site-header .container{justify-content:space-between;align-items:center;gap:16px;display:flex}.brand{letter-spacing:-.02em;color:var(--text);align-items:center;gap:10px;font-size:1.4rem;font-weight:800;display:flex}.brand-mark{border-radius:var(--radius);background:var(--gradient);color:#fff;justify-content:center;align-items:center;width:36px;height:36px;font-size:1.1rem;font-weight:800;display:inline-flex;box-shadow:0 4px 12px #7c3aed59}.main-nav{align-items:center;gap:8px;display:flex}.main-nav a{border-radius:var(--radius-full);color:var(--text-muted);padding:8px 14px;font-size:.95rem;font-weight:500;transition:color .15s,background .15s}.main-nav a:hover{color:var(--text);background:#1118270d}.main-nav a.active{color:var(--primary);background:var(--primary-light);font-weight:600}.header-actions{align-items:center;gap:10px;display:flex}.header-avatar{object-fit:cover;border:2px solid var(--border);border-radius:50%;width:36px;height:36px}.header-avatar-fallback{background:var(--gradient);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:36px;height:36px;font-size:.9rem;font-weight:700;display:inline-flex}.auth-page{min-height:calc(100vh - var(--header-height));background:var(--bg);justify-content:center;align-items:center;padding:48px 24px;display:flex}.auth-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);width:100%;max-width:440px;box-shadow:var(--shadow-lg);grid-template-columns:1fr;display:grid;overflow:hidden}@media (min-width:900px){.auth-card.auth-card-split{grid-template-columns:1fr 1.15fr;max-width:880px}}.auth-panel{background:var(--gradient);color:#fff;flex-direction:column;justify-content:space-between;gap:32px;padding:48px 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.auth-subtitle{color:var(--text-muted);margin-bottom:28px;font-size:.95rem}.form-group{margin-bottom:18px}.form-label{color:var(--text);margin-bottom:6px;font-size:.85rem;font-weight:600;display:block}.form-control{width:100%;color:var(--text);border:1px solid var(--border);border-radius:var(--radius);background:#f9fafb;padding:12px 14px;font-size:.95rem;transition:border-color .15s,box-shadow .15s,background .15s}.form-control::placeholder{color:var(--text-faint)}.form-control:focus{border-color:var(--primary);background:#fff;outline:none;box-shadow:0 0 0 3px #6d28d926}.input-group{position:relative}.input-group .form-control{padding-right:44px}.input-toggle{border-radius:var(--radius-sm);width:34px;height:34px;color:var(--text-muted);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;display:flex;position:absolute;top:50%;right:6px;transform:translateY(-50%)}.input-toggle:hover{color:var(--text);background:#1118270d}textarea.form-control{resize:vertical;min-height:96px}.alert{border-radius:var(--radius);align-items:flex-start;gap:8px;margin-bottom:18px;padding:12px 16px;font-size:.9rem;display:flex}.alert-error{background:var(--danger-soft);color:#b91c1c;border:1px solid #fecaca}.alert-success{background:var(--success-soft);color:#047857;border:1px solid #a7f3d0}.auth-footer{text-align:center;color:var(--text-muted);margin-top:20px;font-size:.9rem}.auth-footer a{color:var(--primary);font-weight:600}.auth-footer a:hover{text-decoration:underline}.app-shell{background:var(--bg);min-height:100vh}.page-container{max-width:1100px;margin:0 auto;padding:28px 24px 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5px;font-size:.7rem;font-weight:700;display:inline-flex}.card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm)}.profile-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px;display:grid}.profile-card{border-radius:var(--radius-lg);cursor:pointer;min-height:300px;box-shadow:var(--shadow);border:none;transition:transform .2s,box-shadow .2s;position:relative;overflow:hidden}.profile-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-6px)rotateX(0)}.profile-card .profile-photo{object-fit:cover;filter:brightness(.72);transition:filter .2s,transform .4s;position:absolute;inset:0}.profile-card:hover .profile-photo{filter:brightness(.6);transform:scale(1.04)}.profile-card-overlay{background:linear-gradient(#0000 0%,#00000026 45%,#000000b8 100%);flex-direction:column;justify-content:flex-end;padding:22px 18px 18px;display:flex;position:absolute;inset:0}.profile-card-name{color:#fff;letter-spacing:-.01em;font-size:1.3rem;font-weight:700}.profile-card-bio{color:#ffffffe0;-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-top:4px;font-size:.9rem;display:-webkit-box;overflow:hidden}.profile-card-chip{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);color:#fff;border-radius:var(--radius-full);background:#fff3;border:1px solid #ffffff40;padding:5px 10px;font-size:.75rem;font-weight:600;position:absolute;top:14px;right:14px}.skeleton{border-radius:var(--radius);background:linear-gradient(90deg,#f3f4f6 25%,#e5e7eb 50%,#f3f4f6 75%) 0 0/200% 100%;animation:1.4s infinite shimmer}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background:#1118278c;justify-content:center;align-items:center;padding:20px;animation:.2s fadeIn;display:flex;position:fixed;inset:0}.modal{background:var(--bg-elevated);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);width:100%;max-width:420px;animation:.25s slideUp;overflow:hidden}.modal-cover{object-fit:cover;width:100%;height:180px}.modal-body{text-align:center;padding:24px}.modal-avatar{object-fit:cover;width:84px;height:84px;box-shadow:var(--shadow);border:4px solid #fff;border-radius:50%;margin:-48px auto 14px;position:relative}.modal-name{font-size:1.4rem;font-weight:800}.modal-email{color:var(--text-muted);margin:2px 0 12px;font-size:.9rem}.modal-bio{color:var(--text);border:1px solid var(--border);border-radius:var(--radius);background:#f9fafb;margin-bottom:20px;padding:12px 16px;font-size:.95rem}.modal-actions{gap:10px;display:flex}.modal-actions .btn{flex:1}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(16px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.chat-app{height:calc(100vh - var(--header-height));background:var(--bg-elevated);display:flex}.chat-sidebar{border-right:1px solid var(--border);background:#fbfbfd;flex-direction:column;flex-shrink:0;width:340px;display:flex}.chat-sidebar-header{padding:20px 20px 16px}.chat-main{flex-direction:column;flex:1;min-width:0;display:flex}.chat-empty{color:var(--text-faint);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:10px;display:flex}.conversation-list{flex:1;padding:0 10px 10px;overflow-y:auto}.conversation-item{border-radius:var(--radius);cursor:pointer;border:1px solid #0000;align-items:center;gap:12px;margin-bottom:4px;padding:12px 14px;transition:background .15s;display:flex}.conversation-item:hover{background:#f3f4f6}.conversation-item.selected{background:var(--primary-light);border-color:#ddd6fe}.conversation-item .avatar{flex-shrink:0;width:46px;height:46px}.conversation-content{flex:1;min-width:0}.conversation-line{justify-content:space-between;align-items:baseline;gap:8px;display:flex}.conversation-name{color:var(--text);white-space:nowrap;text-overflow:ellipsis;font-size:.95rem;font-weight:700;overflow:hidden}.conversation-time{color:var(--text-faint);flex-shrink:0;font-size:.72rem}.conversation-last{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;margin-top:2px;font-size:.85rem;overflow:hidden}.conversation-item.unread .conversation-last{color:var(--text);font-weight:600}.unread-dot{background:var(--danger);border-radius:50%;flex-shrink:0;width:10px;height:10px}.avatar{object-fit:cover;background:#e5e7eb;border-radius:50%}.avatar-fallback{background:var(--gradient);color:#fff;border-radius:50%;justify-content:center;align-items:center;font-weight:700;display:flex}.chat-header{border-bottom:1px solid var(--border);background:var(--bg-elevated);align-items:center;gap:12px;padding:14px 20px;display:flex}.chat-header .avatar{width:42px;height:42px}.chat-header-name{font-size:1.05rem;font-weight:700}.chat-header-status{color:var(--success);font-size:.8rem;font-weight:500}.messages-container{background:#f7f8fa;flex-direction:column;flex:1;gap:4px;padding:20px;display:flex;overflow-y:auto}.message-row{align-items:flex-end;gap:8px;margin-bottom:4px;display:flex}.message-row.sent{justify-content:flex-end}.message-bubble{border-radius:var(--radius-lg);word-break:break-word;white-space:pre-wrap;max-width:68%;padding:10px 14px;font-size:.95rem;line-height:1.45;position:relative}.message-row.sent .message-bubble{background:var(--gradient);color:#fff;border-bottom-right-radius:4px;box-shadow:0 2px 8px #7c3aed40}.message-row.received .message-bubble{background:var(--bg-elevated);border:1px solid var(--border);color:var(--text);border-bottom-left-radius:4px}.message-time{opacity:.7;margin-top:3px;font-size:.68rem}.message-row.received .message-time{color:var(--text-faint);text-align:right}.chat-input-bar{border-top:1px solid var(--border);background:var(--bg-elevated);align-items:flex-end;gap:10px;padding:14px 20px;display:flex}.chat-input{resize:none;min-height:46px;max-height:120px;font:inherit;border:1px solid var(--border);border-radius:var(--radius-full);color:var(--text);background:#f9fafb;flex:1;padding:12px 16px;font-size:.95rem;transition:border-color .15s,box-shadow .15s}.chat-input:focus{border-color:var(--primary);background:#fff;outline:none;box-shadow:0 0 0 3px #6d28d926}.send-btn{background:var(--gradient);color:#fff;cursor:pointer;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:46px;height:46px;transition:transform .15s,box-shadow .15s;display:flex;box-shadow:0 4px 14px #7c3aed4d}.send-btn:hover:not(:disabled){transform:translateY(-1px)scale(1.04)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.loading-layer{background:var(--bg);z-index:9999;justify-content:center;align-items:center;transition:opacity .4s,visibility .4s;display:flex;position:fixed;inset:0}.loading-layer.hidden{opacity:0;visibility:hidden}.loader{border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;width:46px;height:46px;animation:.8s linear infinite spin}.page-loader{justify-content:center;align-items:center;min-height:50vh;display:flex}@keyframes spin{to{transform:rotate(360deg)}}.toast-container{z-index:2000;flex-direction:column;gap:10px;display:flex;position:fixed;top:20px;right:20px}.toast{border-radius:var(--radius);background:var(--text);color:#fff;box-shadow:var(--shadow-lg);align-items:center;gap:10px;min-width:240px;max-width:360px;padding:13px 18px;font-size:.9rem;font-weight:500;animation:.25s slideLeft;display:flex}.toast.success{background:var(--success)}.toast.error{background:var(--danger)}@keyframes slideLeft{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.stat-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);text-align:center;padding:20px}.stat-number{background:var(--gradient);color:#0000;-webkit-background-clip:text;background-clip:text;font-size:1.9rem;font-weight:800}.stat-label{color:var(--text-muted);margin-top:2px;font-size:.85rem}.settings-card{max-width:560px;margin:0 auto}.docs-page{background:var(--bg);padding:64px 24px 96px}.docs-wrap{max-width:720px;margin:0 auto}.docs-title{letter-spacing:-.02em;color:var(--text);margin-bottom:10px;font-size:clamp(2rem,4vw,2.6rem);font-weight:800}.docs-subtitle{color:var(--text-muted);margin-bottom:40px;font-size:1.05rem;line-height:1.6}.docs-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:36px 40px}.docs-section{margin-bottom:28px}.docs-section h2{color:var(--text);align-items:center;gap:10px;margin-bottom:10px;font-size:1.25rem;font-weight:700;display:flex}.docs-section .docs-dot{background:var(--gradient);border-radius:50%;flex-shrink:0;width:8px;height:8px}.docs-section p{color:var(--text-muted);font-size:.97rem;line-height:1.7}.docs-card p:last-child{margin-bottom:0}@media (max-width:600px){.docs-page{padding:40px 16px 64px}.docs-card{padding:28px 24px}}.hide-header .site-header{display:none}.hide-header .chat-app{height:100vh}.hide-header .app-shell{min-height:100vh}@media (max-width:768px){body{font-size:15px}.chat-sidebar{border-right:none;border-bottom:1px solid var(--border);width:100%;max-width:none;max-height:40vh}.chat-app{height:calc(100vh - var(--header-height));flex-direction:column}.auth-form-wrap{padding:28px 24px}.profile-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px}.profile-card{min-height:220px}.btn-lg{padding:14px 28px}}