* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            -webkit-tap-highlight-color: transparent;
        }
        body {
            background-color: #f5f5f7;
            padding-bottom: 80px;
        }
        .top-banner{
            width: 92%;
            max-width: 560px;
            margin: 15px auto;
            height: 140px;
            object-fit: cover;
            display: block;
            border-radius: 18px;
            background: #e5e7eb;
        }
        .chat-container {
            width: 92%;
            max-width: 560px;
            margin: 0 auto;
        }
        .chat-link {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            text-decoration: none;
            color: inherit;
            margin-bottom: 20px;
            transition: transform 0.15s ease;
        }
        .chat-link:active {
            transform: scale(0.98);
        }
        .chat-bubble {
            background-color: #ffffff;
            border-radius: 20px;
            padding: 14px 18px;
            flex: 1;
            box-shadow: 0 1px 3px rgba(0,0,0,0.08);
            text-align: left;
        }
        .chat-name {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 6px;
            color: #1d1d1f;
        }
        .chat-text {
            font-size: 15px;
            color: #6e6e73;
            line-height: 1.5;
        }
        .chat-avatar {
            width: 65px;
            height: 65px;
            border-radius: 50%;
            object-fit: cover;
            flex-shrink: 0;
            background: #e5e7eb;
        }
        .bottom-nav {
            position: fixed;
            left: 0;
            right: 0;
            bottom: 0;
            background: white;
            border-radius: 20px 20px 0 0;
            box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
            padding: 12px 0;
            z-index: 99;
        }
        .nav-wrap {
            max-width: 560px;
            margin: 0 auto;
            display: flex;
            justify-content: space-around;
            align-items: center;
        }
        .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-decoration: none;
            color: #9ca3af;
            gap: 4px;
        }
        .nav-item.active {
            color: #007aff;
        }
        .nav-item img {
            width: 28px;
            height: 28px;
            object-fit: contain;
        }
        .nav-item span {
            font-size: 12px;
            font-weight: 500;
        }