:root{--color-primary: #10b981;--color-primary-dark: #059669;--color-bg: #f9fafb;--color-surface: #ffffff;--color-text: #111827;--color-text-secondary: #6b7280;--color-border: #e5e7eb;--color-error: #ef4444;--radius: 8px;--shadow: 0 1px 3px rgba(0, 0, 0, .1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.5}.page-center{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:16px}.login-card,.error-card{background:var(--color-surface);padding:48px;border-radius:var(--radius);box-shadow:var(--shadow);text-align:center;max-width:400px}.login-card h1{font-size:2rem;margin-bottom:8px}.login-card p{color:var(--color-text-secondary);margin-bottom:24px}.btn-primary{background:var(--color-primary);color:#fff;border:none;padding:12px 32px;border-radius:var(--radius);font-size:1rem;cursor:pointer;transition:background .2s}.btn-primary:hover{background:var(--color-primary-dark)}.btn-text{background:none;border:none;color:var(--color-text-secondary);cursor:pointer;font-size:.875rem}.btn-text:hover{color:var(--color-text)}.chat-layout{display:flex;height:100vh}.chat-sidebar{width:320px;background:var(--color-surface);border-right:1px solid var(--color-border);display:flex;flex-direction:column}.sidebar-header{padding:16px;border-bottom:1px solid var(--color-border)}.sidebar-header h2{font-size:1.25rem}.user-info{display:flex;align-items:center;justify-content:space-between;margin-top:8px}.user-info span{font-size:16px;font-weight:700}.conversation-list{flex:1;overflow-y:auto;padding:8px}.chat-main{flex:1;display:flex;flex-direction:column}.chat-empty,.chat-messages{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--color-text-secondary)}.placeholder{color:var(--color-text-secondary);padding:16px}.spinner{width:32px;height:32px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.btn-icon{background:none;border:none;font-size:1.25rem;cursor:pointer;padding:4px 8px;border-radius:var(--radius);transition:background .2s}.btn-icon:hover{background:var(--color-bg)}.conv-item{display:flex;align-items:center;gap:12px;padding:12px;cursor:pointer;border-radius:var(--radius);transition:background .2s}.conv-item:hover{background:var(--color-bg)}.conv-item.active{background:var(--color-bg);border-left:3px solid var(--color-primary)}.conv-avatar-wrap{position:relative;flex-shrink:0}.conv-avatar{width:40px;height:40px;border-radius:50%;background:var(--color-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:600;flex-shrink:0}.presence-dot{position:absolute;bottom:0;right:0;width:12px;height:12px;border-radius:50%;border:2px solid var(--color-surface)}.presence-dot.online{background:#22c55e}.presence-dot.offline{background:#9ca3af}.conv-info{flex:1;min-width:0}.conv-name{font-weight:500;font-size:14px}.conv-preview{font-size:.875rem;color:var(--color-text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv-item.unread .conv-name{font-weight:700}.conv-preview.unread{font-weight:700;color:var(--color-text)}.chat-header{padding:16px;border-bottom:1px solid var(--color-border);background:var(--color-surface)}.chat-header-info{display:flex;align-items:center;gap:10px}.chat-header-info h3{margin:0;font-size:1.125rem}.presence-label{font-size:.75rem;font-weight:500}.presence-label.online{color:#22c55e}.presence-label.offline{color:#9ca3af}.chat-messages-area{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:8px;position:relative}.chat-empty-msg{flex:1;display:flex;align-items:center;justify-content:center;color:var(--color-text-secondary)}.msg-bubble{max-width:70%;padding:8px 12px;border-radius:12px;word-wrap:break-word;overflow:hidden;min-width:0;-webkit-user-select:none;user-select:none;cursor:pointer}.msg-bubble.sent{align-self:flex-end;background:var(--color-primary);color:#fff;border-bottom-right-radius:4px}.msg-bubble.received{align-self:flex-start;background:#e5e7eb;color:var(--color-text);border-bottom-left-radius:4px}.msg-content{margin-bottom:2px}.msg-time{font-size:.75rem;opacity:.7}.msg-bubble.sent .msg-time{text-align:right}.msg-status{display:inline;margin-left:3px;font-size:.7rem;letter-spacing:-1px}.msg-status.sent{opacity:.6}.msg-status.delivered{opacity:.7}.msg-status.read{color:#4fc3f7;opacity:1}.chat-input{display:flex;gap:8px;padding:16px;border-top:1px solid var(--color-border);background:var(--color-surface)}.chat-input input{flex:1;padding:10px 14px;border:1px solid var(--color-border);border-radius:var(--radius);font-size:.875rem;outline:none;transition:border-color .2s}.chat-input input:focus{border-color:var(--color-primary)}.btn-send{background:var(--color-primary);color:#fff;border:none;padding:10px 20px;border-radius:var(--radius);cursor:pointer;font-size:1.25rem;transition:background .2s}.btn-send:hover{background:var(--color-primary-dark)}.btn-send:disabled{opacity:.5;cursor:not-allowed}.btn-attach{background:none;border:none;cursor:pointer;font-size:1.4rem;padding:4px 8px;border-radius:var(--radius);transition:background .2s}.btn-attach:hover{background:var(--color-border)}.msg-images{display:flex;flex-wrap:wrap;gap:4px;max-width:100%}.msg-img{max-width:260px;max-height:260px;border-radius:8px;object-fit:cover;cursor:pointer;transition:opacity .2s;display:block}.msg-img:hover{opacity:.85}.image-preview-bar{display:flex;align-items:center;gap:8px;padding:8px 16px;border-top:1px solid var(--color-border);background:var(--color-surface);overflow-x:auto}.image-preview-thumb{flex-shrink:0}.image-preview-thumb img{width:64px;height:64px;object-fit:cover;border-radius:6px;border:2px solid var(--color-border)}.btn-cancel-images{background:none;border:none;font-size:1.1rem;cursor:pointer;color:var(--color-text-secondary);padding:4px 8px;border-radius:var(--radius)}.btn-cancel-images:hover{background:#fee2e2;color:#ef4444}.btn-send-images{background:var(--color-primary);color:#fff;border:none;padding:6px 14px;border-radius:var(--radius);cursor:pointer;font-size:1.1rem}.btn-send-images:disabled{opacity:.5;cursor:not-allowed}.chat-messages-area.drag-over{position:relative}.drag-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#3b82f61f;border:3px dashed var(--color-primary);border-radius:8px;z-index:10;display:flex;align-items:center;justify-content:center}.drag-overlay-content{font-size:1.25rem;color:var(--color-primary);font-weight:600;padding:16px 24px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal{background:var(--color-surface);border-radius:var(--radius);width:90%;max-width:480px;max-height:80vh;display:flex;flex-direction:column;box-shadow:0 10px 40px #0003}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:16px;border-bottom:1px solid var(--color-border)}.modal-header h3{margin:0}.btn-close{background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--color-text-secondary);line-height:1}.btn-close:hover{color:var(--color-text)}.search-input{margin:16px;padding:10px 14px;border:1px solid var(--color-border);border-radius:var(--radius);font-size:.875rem;outline:none}.search-input:focus{border-color:var(--color-primary)}.search-results{flex:1;overflow-y:auto;padding:0 16px 16px}.search-item{display:flex;align-items:center;gap:12px;padding:12px;cursor:pointer;border-radius:var(--radius);transition:background .2s}.search-item:hover{background:var(--color-bg)}.search-item.selected{background:#10b98114}.modal-tabs{display:flex;border-bottom:1px solid var(--color-border)}.modal-tab{flex:1;padding:10px;background:none;border:none;border-bottom:2px solid transparent;cursor:pointer;font-size:.875rem;font-weight:500;color:var(--color-text-secondary);transition:all .2s}.modal-tab:hover{background:var(--color-bg)}.modal-tab.active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.selected-chips{display:flex;flex-wrap:wrap;gap:6px;padding:8px 16px}.chip{display:inline-flex;align-items:center;gap:4px;padding:4px 10px;background:#10b9811f;color:var(--color-primary);border-radius:999px;font-size:.8rem;font-weight:500}.chip-remove{background:none;border:none;cursor:pointer;font-size:.7rem;color:var(--color-primary);padding:0 2px;line-height:1;opacity:.7}.chip-remove:hover{opacity:1}.checkbox{width:20px;height:20px;border:2px solid var(--color-border);border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:.75rem;flex-shrink:0;color:#fff;transition:all .2s}.checkbox.checked{background:var(--color-primary);border-color:var(--color-primary)}.modal-footer{padding:12px 16px;border-top:1px solid var(--color-border)}.modal-footer .btn-primary{width:100%}.modal-footer .btn-primary:disabled{opacity:.5;cursor:not-allowed}.conv-avatar.group{background:linear-gradient(135deg,var(--color-primary),#059669);font-size:1.1rem}.group-subtitle{color:var(--color-text-secondary)!important;font-size:.8rem}.msg-row-group{display:flex;align-items:flex-end;gap:8px;align-self:flex-start;max-width:80%}.msg-row-group .msg-bubble{max-width:none}.msg-row-group .msg-col{max-width:none;min-width:0}.msg-bubble.msg-deleted{opacity:.7}.msg-deleted-text{font-style:italic;color:#6b7280;font-size:.9rem}.msg-bubble.sent.msg-deleted .msg-deleted-text{color:#ffffffb3}.msg-avatar{width:30px;height:30px;border-radius:50%;background:var(--color-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:600;flex-shrink:0}.msg-sender-name{font-size:.75rem;font-weight:600;color:var(--color-primary);margin-bottom:2px}.login-form{display:flex;flex-direction:column;gap:12px;text-align:left}.login-form label{font-size:.875rem;font-weight:500}.login-form input{padding:10px 14px;border:1px solid var(--color-border);border-radius:var(--radius);font-size:.875rem;outline:none}.login-form input:focus{border-color:var(--color-primary)}.login-error{color:var(--color-error);font-size:.875rem;text-align:center}.profile-page{min-height:100vh;background:var(--color-bg);display:flex;justify-content:center;padding:40px 16px}.profile-container{width:100%;max-width:560px}.profile-header{display:flex;align-items:center;gap:16px;margin-bottom:32px}.profile-header h2{font-size:1.5rem;font-weight:700;color:var(--color-text)}.profile-avatar-section{display:flex;flex-direction:column;align-items:center;gap:8px;margin-bottom:32px}.profile-avatar-wrapper{width:100px;height:100px;border-radius:50%;position:relative;cursor:pointer;overflow:hidden}.profile-avatar-img{width:100%;height:100%;object-fit:cover;border-radius:50%}.profile-avatar-placeholder{width:100%;height:100%;border-radius:50%;background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff;display:flex;align-items:center;justify-content:center;font-size:2rem;font-weight:700}.profile-avatar-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:#fff;opacity:0;transition:opacity .2s;border-radius:50%}.profile-avatar-wrapper:hover .profile-avatar-overlay{opacity:1}.profile-upload-status{font-size:.8rem;color:var(--color-text-secondary)}.profile-form{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:24px;margin-bottom:24px}.profile-form h3{font-size:1.1rem;font-weight:600;margin-bottom:16px;color:var(--color-text)}.profile-field-row{display:flex;gap:12px;margin-bottom:12px}.profile-field-row>label{flex:1;display:flex;flex-direction:column;gap:4px}.profile-field{display:flex;flex-direction:column;gap:4px;margin-bottom:12px}.profile-field span,.profile-field-row span{font-size:.8rem;font-weight:500;color:var(--color-text-secondary)}.profile-form input,.profile-form textarea{padding:10px 14px;border:1px solid var(--color-border);border-radius:var(--radius);font-size:.875rem;outline:none;font-family:inherit;resize:vertical}.profile-form input:focus,.profile-form textarea:focus{border-color:var(--color-primary)}.profile-msg{padding:8px 12px;border-radius:var(--radius);font-size:.85rem;margin-bottom:12px}.profile-msg-ok{background:#ecfdf5;color:#065f46}.profile-msg-err{background:#fef2f2;color:#991b1b}.profile-password-section{border-top:none}.msg-context-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:1000;background:#00000026}.msg-context-menu{position:fixed;z-index:1001;background:#fff;border-radius:10px;box-shadow:0 4px 20px #0000002e;padding:6px 0;min-width:170px;transform:translate(-50%,-100%);animation:ctx-menu-pop .15s ease-out}@keyframes ctx-menu-pop{0%{opacity:0;transform:translate(-50%,-100%) scale(.92)}to{opacity:1;transform:translate(-50%,-100%) scale(1)}}.ctx-menu-item{display:flex;align-items:center;gap:10px;width:100%;padding:10px 16px;border:none;background:none;font-size:.92rem;color:#1f2937;cursor:pointer;transition:background .12s}.ctx-menu-item:hover{background:#f3f4f6}.ctx-menu-item.ctx-menu-delete{color:#dc2626}.ctx-menu-item.ctx-menu-delete:hover{background:#fef2f2}.ctx-icon{font-size:1rem;width:20px;text-align:center}.msg-reply-quote{background:#00000014;border-left:3px solid rgba(0,0,0,.3);padding:6px 8px;margin-bottom:6px;border-radius:4px;font-size:.85rem;cursor:pointer}.msg-reply-quote.reply-in-sent{background:#fff3;border-left-color:#ffffff80}.msg-reply-quote.reply-in-received{background:#0000000d;border-left-color:var(--color-primary)}.reply-quote-sender{font-weight:600;margin-bottom:2px;font-size:.8rem}.reply-quote-text{opacity:.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:220px}.reply-preview-bar{display:flex;align-items:center;gap:10px;padding:10px 16px;background:#f9fafb;border-top:1px solid #e5e7eb}.reply-preview-indicator{width:3px;height:40px;background:var(--color-primary);border-radius:2px;flex-shrink:0}.reply-preview-content{flex:1;min-width:0}.reply-preview-sender{font-size:.8rem;font-weight:600;color:var(--color-primary);margin-bottom:2px}.reply-preview-text{font-size:.9rem;color:#6b7280;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.reply-preview-close{width:28px;height:28px;border:none;background:#e5e7eb;border-radius:50%;cursor:pointer;font-size:1rem;color:#6b7280;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s}.reply-preview-close:hover{background:#d1d5db;color:#374151}.edit-preview-bar{display:flex;align-items:center;gap:10px;padding:10px 16px;background:#fef9e7;border-top:1px solid #f0dfa0}.edit-preview-indicator{width:3px;height:40px;background:#f59e0b;border-radius:2px;flex-shrink:0}.edit-preview-content{flex:1;min-width:0}.edit-preview-label{font-size:.8rem;font-weight:600;color:#d97706;margin-bottom:2px}.edit-preview-text{font-size:.9rem;color:#6b7280;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.msg-edited-label{font-size:.65rem;font-style:italic;opacity:.7;margin-right:4px}.sent .msg-edited-label{color:#ffffffbf}.received .msg-edited-label{color:#9ca3af}.forward-preview{padding:12px 20px;background:#f3f4f6;border-bottom:1px solid #e5e7eb}.forward-preview-label{font-size:.75rem;font-weight:600;color:#6b7280;margin-bottom:4px}.forward-preview-content{font-size:.9rem;color:#374151;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.forward-conv-list{max-height:360px;overflow-y:auto;padding:8px 0}.forward-conv-item{display:flex;align-items:center;gap:12px;padding:10px 20px;cursor:pointer;transition:background .15s}.forward-conv-item:hover{background:#f0f9ff}.forward-conv-info{flex:1;min-width:0}.forward-conv-name{font-weight:600;font-size:.95rem;color:#1f2937;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.forward-conv-sub{font-size:.8rem;color:#9ca3af}.forward-arrow{color:#9ca3af;font-size:1.1rem;flex-shrink:0}.msg-forwarded-label{font-size:.72rem;font-style:italic;padding-bottom:4px;margin-bottom:2px;border-bottom:1px solid rgba(0,0,0,.08)}.forwarded-sent{color:#ffffffb3;border-bottom-color:#ffffff26}.forwarded-received{color:#9ca3af;border-bottom-color:#0000000f}.msg-col{display:flex;flex-direction:column;max-width:70%;min-width:0}.msg-col .msg-bubble{max-width:none}.msg-col-right{display:flex;flex-direction:column;align-items:flex-end;align-self:flex-end;max-width:70%;min-width:0}.msg-col-right .msg-bubble{max-width:none}.msg-read-avatars{display:flex;gap:2px;margin-top:2px;padding:0 4px}.read-avatars-right{justify-content:flex-end}.read-avatars-left{justify-content:flex-start}.read-avatar{width:18px;height:18px;border-radius:50%;background:#b0bec5;color:#fff;font-size:.5rem;font-weight:700;display:flex;align-items:center;justify-content:center;cursor:default;flex-shrink:0}