:root {
        --primary-color: #2563eb;
        --bg-color: #f8fafc;
        --card-bg: #ffffff;
        --text-main: #1e293b;
        --text-sub: #475569;
        --success: #22c55e;
        --warning: #eab308;
        --error: #ef4444;
        --border-color: #e2e8f0;
    }
    
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }
    
    body {
        background-color: var(--bg-color);
        color: var(--text-main);
        display: flex;
        justify-content: center;
        min-height: 100vh;
        padding: 20px;
    }
    
    .container {
        width: 100%;
        max-width: 480px;
        margin-top: 20px;
        margin-bottom: 40px;
    }
    /* Header */
    
    .header {
        text-align: center;
        margin-bottom: 30px;
    }
    
    .header h1 {
        font-size: 24px;
        font-weight: 700;
        margin-bottom: 10px;
        color: var(--text-main);
    }
    
    .header p {
        color: var(--text-sub);
        font-size: 14px;
    }
    
    .update-badge {
        display: inline-block;
        background: #dbeafe;
        color: var(--primary-color);
        padding: 4px 12px;
        border-radius: 20px;
        font-size: 12px;
        font-weight: 600;
        margin-top: 10px;
    }
    /* List */
    
    .link-list {
        list-style: none;
        margin-bottom: 30px;
    }
    
    .link-card {
        background: var(--card-bg);
        border-radius: 12px;
        padding: 16px 20px;
        margin-bottom: 16px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
        display: flex;
        align-items: center;
        justify-content: space-between;
        transition: transform 0.2s, box-shadow 0.2s;
        border: 1px solid var(--border-color);
        text-decoration: none;
        color: inherit;
    }
    
    .link-card:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 12px -3px rgba(0, 0, 0, 0.05);
        border-color: var(--primary-color);
    }
    
    .domain-info {
        flex: 1;
    }
    
    .domain-name {
        font-weight: 600;
        font-size: 16px;
        margin-bottom: 4px;
        display: block;
    }
    
    .domain-url {
        color: var(--text-sub);
        font-size: 12px;
        display: block;
    }
    /* Speed Tag */
    
    .speed-tag {
        font-size: 12px;
        font-weight: 600;
        padding: 4px 10px;
        border-radius: 6px;
        min-width: 70px;
        text-align: center;
        background-color: #f1f5f9;
        color: var(--text-sub);
        margin-left: 10px;
    }
    
    .speed-fast {
        background-color: #dcfce7;
        color: #166534;
    }
    
    .speed-medium {
        background-color: #fef9c3;
        color: #854d0e;
    }
    
    .speed-slow {
        background-color: #fee2e2;
        color: #991b1b;
    }
    
    .btn-go {
        margin-left: 12px;
        background: var(--primary-color);
        color: white;
        padding: 8px 16px;
        border-radius: 8px;
        font-size: 14px;
        font-weight: 500;
        border: none;
        cursor: pointer;
    }
    /* Content Blocks (New) */
    
    .section-title {
        font-size: 16px;
        font-weight: 700;
        margin-bottom: 12px;
        display: flex;
        align-items: center;
    }
    
    .section-title.warning {
        color: var(--error);
    }
    
    .section-title.info {
        color: var(--primary-color);
    }
    
    .section-title .icon {
        margin-right: 8px;
        font-size: 18px;
    }
    
    .info-card {
        background: var(--card-bg);
        border-radius: 12px;
        padding: 20px;
        border: 1px solid var(--border-color);
        font-size: 14px;
        color: var(--text-sub);
        line-height: 1.6;
        margin-bottom: 20px;
    }
    
    .info-card ul,
    .info-card ol {
        padding-left: 20px;
        margin-top: 8px;
    }
    
    .info-card li {
        margin-bottom: 6px;
    }
    
    .text-highlight {
        color: var(--text-main);
        font-weight: 500;
    }
    /* Footer */
    
    .footer {
        text-align: center;
        margin-top: 40px;
        color: #94a3b8;
        font-size: 12px;
    }
    
    .footer a {
        color: var(--primary-color);
        text-decoration: none;
    }
    /* Loading Animation */
    
    .loading-dots:after {
        content: ' .';
        animation: dots 1s steps(5, end) infinite;
    }
    
    @keyframes dots {
        0%,
        20% {
            color: rgba(0, 0, 0, 0);
            text-shadow: .25em 0 0 rgba(0, 0, 0, 0), .5em 0 0 rgba(0, 0, 0, 0);
        }
        40% {
            color: #333;
            text-shadow: .25em 0 0 rgba(0, 0, 0, 0), .5em 0 0 rgba(0, 0, 0, 0);
        }
        60% {
            text-shadow: .25em 0 0 #333, .5em 0 0 rgba(0, 0, 0, 0);
        }
        80%,
        100% {
            text-shadow: .25em 0 0 #333, .5em 0 0 #333;
        }
    }