*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#f8f9fa;--color-surface:#fff;--color-border:#e2e8f0;--color-text:#1a202c;--color-text-secondary:#64748b;--color-primary:#2563eb;--color-primary-hover:#1d4ed8;--color-accent:#10b981;--color-danger:#ef4444;--color-unread:#eff6ff;--color-admin-msg:#f0fdf4;--color-user-msg:#fff;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px -1px #0000001a;--radius:8px}body{background-color:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;font-family:inherit}.app-layout{min-height:100vh;display:flex}.sidebar{background:var(--color-surface);border-right:1px solid var(--color-border);flex-direction:column;flex-shrink:0;width:240px;padding:24px 0;display:flex}.sidebar-logout{color:var(--color-text-secondary);border:none;border-top:1px solid var(--color-border);cursor:pointer;background:0 0;align-items:center;gap:10px;padding:10px 24px;font-size:14px;transition:color .15s;display:flex}.sidebar-logout:hover{color:var(--color-danger)}.sidebar-logo{color:var(--color-primary);padding:0 24px 24px;font-size:20px;font-weight:700}.sidebar-nav{flex-direction:column;flex:1;gap:2px;display:flex}.sidebar-link{color:var(--color-text-secondary);align-items:center;gap:12px;padding:10px 24px;font-size:14px;font-weight:500;transition:all .15s;display:flex}.sidebar-link:hover{background:var(--color-bg);color:var(--color-text)}.sidebar-link.active{background:var(--color-unread);color:var(--color-primary)}.main-content{flex:1;min-width:0;padding:24px 32px}.page-header{margin-bottom:24px}.page-header h1{font-size:24px;font-weight:700}.page-header p{color:var(--color-text-secondary);margin-top:4px;font-size:14px}.email-list{background:var(--color-surface);border-radius:var(--radius);border:1px solid var(--color-border);overflow:hidden}.email-list-header{border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.email-list-header h2{font-size:16px;font-weight:600}.email-count{color:var(--color-text-secondary);font-size:13px}.email-item{border-bottom:1px solid var(--color-border);cursor:pointer;align-items:flex-start;gap:16px;padding:16px 20px;transition:background .15s;display:flex}.email-item:last-child{border-bottom:none}.email-item:hover{background:var(--color-bg)}.email-item.unread{background:var(--color-unread)}.email-item.unread:hover{background:#dbeafe}.unread-dot{background:var(--color-primary);border-radius:50%;flex-shrink:0;width:8px;height:8px;margin-top:7px}.unread-dot.read{background:0 0}.email-item-content{flex:1;min-width:0}.email-item-top{justify-content:space-between;align-items:center;margin-bottom:4px;display:flex}.email-sender{font-size:14px;font-weight:600}.email-item.unread .email-sender{font-weight:700}.email-date{color:var(--color-text-secondary);flex-shrink:0;font-size:12px}.email-subject{white-space:nowrap;text-overflow:ellipsis;margin-bottom:2px;font-size:14px;font-weight:500;overflow:hidden}.email-preview{color:var(--color-text-secondary);white-space:nowrap;text-overflow:ellipsis;font-size:13px;overflow:hidden}.message-count-badge{background:var(--color-border);color:var(--color-text-secondary);border-radius:10px;justify-content:center;align-items:center;margin-left:8px;padding:1px 6px;font-size:11px;font-weight:600;display:inline-flex}.thread-header{align-items:center;gap:12px;margin-bottom:24px;display:flex}.back-button{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);color:var(--color-text-secondary);align-items:center;gap:6px;padding:8px 12px;font-size:13px;font-weight:500;transition:all .15s;display:flex}.back-button:hover{background:var(--color-bg);color:var(--color-text)}.thread-subject{font-size:20px;font-weight:700}.thread-participants{color:var(--color-text-secondary);margin-bottom:24px;font-size:13px}.messages-list{flex-direction:column;gap:16px;margin-bottom:24px;display:flex}.message-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);overflow:hidden}.message-card.admin{border-left:3px solid var(--color-accent)}.message-header{background:var(--color-bg);border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.message-card.admin .message-header{background:var(--color-admin-msg)}.message-sender-info{align-items:center;gap:8px;display:flex}.message-avatar{color:#fff;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:13px;font-weight:600;display:flex}.message-avatar.admin{background:var(--color-accent)}.message-avatar.user{background:var(--color-primary)}.message-sender-name{font-size:14px;font-weight:600}.message-sender-email{color:var(--color-text-secondary);font-size:12px}.admin-badge{background:var(--color-accent);color:#fff;border-radius:10px;padding:2px 8px;font-size:11px;font-weight:600}.message-date{color:var(--color-text-secondary);font-size:12px}.message-body{white-space:pre-wrap;padding:16px;font-size:14px;line-height:1.7}.reply-form{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);overflow:hidden}.reply-form-header{background:var(--color-bg);border-bottom:1px solid var(--color-border);padding:12px 16px;font-size:14px;font-weight:600}.reply-form-body{padding:16px}.reply-textarea{border:1px solid var(--color-border);border-radius:var(--radius);resize:vertical;width:100%;min-height:120px;padding:12px;font-family:inherit;font-size:14px;line-height:1.6;transition:border-color .15s}.reply-textarea:focus{border-color:var(--color-primary);outline:none;box-shadow:0 0 0 3px #2563eb1a}.reply-form-actions{border-top:1px solid var(--color-border);justify-content:flex-end;gap:8px;padding:12px 16px;display:flex}.btn{border-radius:var(--radius);padding:8px 16px;font-size:13px;font-weight:500;transition:all .15s}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--color-surface);color:var(--color-text-secondary);border:1px solid var(--color-border)}.btn-secondary:hover{background:var(--color-bg)}.filter-bar{gap:8px;margin-bottom:16px;display:flex}.filter-btn{background:var(--color-surface);color:var(--color-text-secondary);border:1px solid var(--color-border);border-radius:20px;padding:6px 14px;font-size:13px;font-weight:500;transition:all .15s}.filter-btn:hover{border-color:var(--color-primary);color:var(--color-primary)}.filter-btn.active{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.empty-state{text-align:center;color:var(--color-text-secondary);padding:48px 24px}.empty-state-icon{margin-bottom:16px;font-size:48px}.empty-state h3{color:var(--color-text);margin-bottom:4px;font-size:16px;font-weight:600}.empty-state p{font-size:14px}.auth-page{background:var(--color-bg);justify-content:center;align-items:center;min-height:100vh;padding:16px;display:flex}.auth-card{background:var(--color-surface);border:1px solid var(--color-border);width:100%;max-width:420px;box-shadow:var(--shadow-md);border-radius:12px;padding:40px 32px}.auth-header{text-align:center;margin-bottom:32px}.auth-logo{color:var(--color-primary);margin-bottom:8px;font-size:24px;font-weight:700}.auth-subtitle{color:var(--color-text-secondary);font-size:14px}.auth-error{color:var(--color-danger);border-radius:var(--radius);background:#fef2f2;border:1px solid #fecaca;margin-bottom:20px;padding:10px 14px;font-size:13px}.auth-form{flex-direction:column;gap:16px;display:flex}.form-group{flex-direction:column;flex:1;gap:6px;display:flex}.form-group label{color:var(--color-text);font-size:13px;font-weight:500}.form-group input{border:1px solid var(--color-border);border-radius:var(--radius);color:var(--color-text);background:var(--color-surface);padding:10px 12px;font-family:inherit;font-size:14px;transition:border-color .15s}.form-group input:focus{border-color:var(--color-primary);outline:none;box-shadow:0 0 0 3px #2563eb1a}.form-group input::placeholder{color:var(--color-text-secondary)}.form-hint{color:var(--color-text-secondary);font-size:12px}.form-row{gap:12px;display:flex}.auth-btn{background:var(--color-primary);color:#fff;border-radius:var(--radius);cursor:pointer;border:none;margin-top:4px;padding:10px 16px;font-size:14px;font-weight:500;transition:background .15s}.auth-btn:hover:not(:disabled){background:var(--color-primary-hover)}.auth-btn:disabled{opacity:.6;cursor:not-allowed}.auth-footer{text-align:center;color:var(--color-text-secondary);margin-top:24px;font-size:13px}.auth-link{color:var(--color-primary);font-weight:500;text-decoration:none}.auth-link:hover{text-decoration:underline}