.messages-layout { display: grid; grid-template-columns: 320px 1fr; height: calc(100vh - 60px); }
    .messages-sidebar { background: var(--bg-card); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; }
    .messages-header { padding: var(--space-4); border-bottom: 1px solid var(--border-color); }
    .messages-header h2 { font-size: 1.125rem; font-weight: 600; }
    .messages-search { padding: var(--space-3) var(--space-4); }
    .messages-search input { width: 100%; padding: var(--space-2) var(--space-3); border: 1px solid var(--border-color); border-radius: var(--radius-md); background: var(--bg-input); color: var(--text-primary); font-size: 0.875rem; }
    .messages-list { flex: 1; overflow-y: auto; }
    .message-item { display: flex; gap: var(--space-3); padding: var(--space-3) var(--space-4); cursor: pointer; transition: background var(--transition-fast); border-bottom: 1px solid var(--border-light); }
    .message-item:hover { background: var(--bg-hover); }
    .message-item.active { background: var(--color-primary-light); }
    .message-item.unread .message-preview { font-weight: 600; color: var(--text-primary); }
    .message-item.unread .message-dot { display: block; }
    .message-avatar { width: 48px; height: 48px; border-radius: 50%; background: var(--gradient-primary); display: flex; align-items: center; justify-content: center; font-weight: 600; color: var(--text-white); flex-shrink: 0; }
    .message-content { flex: 1; min-width: 0; }
    .message-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
    .message-name { font-weight: 600; font-size: 0.9375rem; color: var(--text-primary); }
    .message-time { font-size: 0.75rem; color: var(--text-muted); }
    .message-preview { font-size: 0.8125rem; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .message-meta { display: flex; align-items: center; gap: var(--space-2); margin-top: 4px; }
    .message-tag { font-size: 0.6875rem; padding: 2px 6px; border-radius: var(--radius-sm); background: var(--bg-muted); color: var(--text-muted); }
    .message-dot { display: none; width: 8px; height: 8px; border-radius: 50%; background: var(--color-primary); }

    .messages-main { display: flex; flex-direction: column; background: var(--bg-body); }
    .chat-header { display: flex; align-items: center; justify-content: space-between; padding: var(--space-3) var(--space-5); border-bottom: 1px solid var(--border-color); background: var(--bg-card); }
    .chat-user { display: flex; align-items: center; gap: var(--space-3); }
    .chat-user-info h3 { font-size: 1rem; font-weight: 600; }
    .chat-user-info p { font-size: 0.75rem; color: var(--text-muted); }
    .chat-status { display: flex; align-items: center; gap: 6px; font-size: 0.8125rem; color: var(--color-success); }
    .chat-status::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--color-success); }
    .chat-actions { display: flex; gap: var(--space-2); }
    .chat-action-btn { padding: var(--space-2); border-radius: var(--radius-md); color: var(--text-secondary); transition: all var(--transition-fast); }
    .chat-action-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

    .chat-messages { flex: 1; overflow-y: auto; padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-4); }
    .chat-date { text-align: center; font-size: 0.75rem; color: var(--text-muted); margin: var(--space-2) 0; }
    .chat-message { display: flex; gap: var(--space-3); max-width: 70%; }
    .chat-message.sent { align-self: flex-end; flex-direction: row-reverse; }
    .chat-message.sent .chat-bubble { background: var(--color-primary); color: var(--text-white); border-radius: var(--radius-lg) var(--radius-lg) 4px var(--radius-lg); }
    .chat-message.received .chat-bubble { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) 4px; }
    .chat-avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--gradient-primary); display: flex; align-items: center; justify-content: center; font-size: 0.875rem; font-weight: 600; color: var(--text-white); flex-shrink: 0; }
    .chat-bubble { padding: var(--space-3) var(--space-4); font-size: 0.9375rem; line-height: 1.5; }
    .chat-time { font-size: 0.6875rem; color: var(--text-muted); margin-top: 4px; text-align: right; }
    .chat-message.sent .chat-time { color: rgba(255,255,255,0.7); }

    .chat-input-area { padding: var(--space-4) var(--space-5); border-top: 1px solid var(--border-color); background: var(--bg-card); }
    .chat-input-wrap { display: flex; gap: var(--space-3); align-items: flex-end; }
    .chat-input { flex: 1; padding: var(--space-3) var(--space-4); border: 1px solid var(--border-color); border-radius: var(--radius-xl); background: var(--bg-input); color: var(--text-primary); font-size: 0.9375rem; resize: none; min-height: 44px; max-height: 120px; }
    .chat-input:focus { border-color: var(--color-primary); outline: none; }
    .chat-send-btn { padding: var(--space-3); border-radius: var(--radius-full); background: var(--color-primary); color: var(--text-white); transition: all var(--transition-fast); }
    .chat-send-btn:hover { filter: brightness(1.1); }
    .chat-send-btn svg { width: 20px; height: 20px; }

    .empty-chat { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100%; color: var(--text-muted); }
    .empty-chat svg { width: 64px; height: 64px; margin-bottom: var(--space-4); opacity: 0.5; }

    @media (max-width: 1023px) {
      .messages-layout { grid-template-columns: 280px 1fr; }
    }
    @media (max-width: 767px) {
      .messages-layout { grid-template-columns: 1fr; }
      .messages-sidebar { display: none; }
      .messages-sidebar.active { display: flex; position: fixed; inset: 60px 0 0 0; z-index: 50; }
      .chat-back { display: flex; }
    }