/* Base Reset & Typography */
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: #ffffff; /* Clean white background */
            color: #333333;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        :root {
            --primary-black: #111111;
            --brand-red: #F1302b;      /* Main Brand Red */
            --text-muted: #666666;
            --border-color: #eeeeee;
            --transition-smooth: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        /* Section Headings */
        .section-title {
            text-align: center;
            font-size: 28px;
            color: var(--primary-black);
            margin: 60px 0 15px 0;
            position: relative;
            text-transform: uppercase;
            font-weight: 700;
            letter-spacing: 0.5px;
        }

        .section-title::after {
            content: '';
            display: block;
            width: 50px;
            height: 3px;
            background-color: var(--brand-red);
            margin: 12px auto 0 auto;
            transition: var(--transition-smooth);
        }
        
        .section-title:hover::after {
            width: 90px;
        }

        .section-subtitle {
            text-align: center;
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 40px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        /* ==========================================================================
           1. Industry & Equipment Application Cases (Alternating Layout)
           ========================================================================== */
        .case-section {
            padding: 40px 0;
            background: #ffffff;
        }

        .case-row {
            display: flex;
            flex-direction: column;
            margin-bottom: 50px;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 50px;
            align-items: center;
        }

        .case-row:last-child {
            border-bottom: none;
            padding-bottom: 0;
            margin-bottom: 0;
        }

        .case-img-box {
            width: 100%;
            overflow: hidden;
            border-radius: 4px;
            border: 1px solid var(--border-color);
            position: relative;
        }

        .case-img-box img {
            width: 100%;
            height: auto;
            display: block;
            transition: var(--transition-smooth);
        }

        /* Image hover interaction */
        .case-row:hover .case-img-box img {
            transform: scale(1.04);
            filter: brightness(1.05);
        }

        .case-text-box {
            width: 100%;
            padding: 25px 0 0 0;
        }

        .case-tag {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            text-transform: uppercase;
            color: var(--brand-red);
            border: 1px solid var(--brand-red);
            padding: 2px 10px;
            border-radius: 2px;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        .case-text-box h3 {
            font-size: 22px;
            color: var(--primary-black);
            margin-bottom: 15px;
            font-weight: 700;
            transition: var(--transition-smooth);
        }
        
        .case-row:hover .case-text-box h3 {
            color: var(--brand-red);
        }

        .case-text-box p {
            font-size: 14.5px;
            color: #555;
            text-align: justify;
            margin-bottom: 15px;
        }

        .case-meta {
            list-style: none;
            font-size: 13.5px;
            color: var(--text-muted);
        }

        .case-meta li {
            margin-bottom: 6px;
            padding-left: 15px;
            position: relative;
        }

        .case-meta li::before {
            content: '■';
            color: var(--brand-red);
            font-size: 8px;
            position: absolute;
            left: 0;
            top: 1px;
        }

        /* ==========================================================================
           2. Coating Removal Samples & Gallery (Grid Layout)
           ========================================================================== */
        .samples-section {
            padding: 60px 0;
            background: #ffffff;
        }

        .samples-grid {
            display: grid;
            grid-template-columns: repeat(1, 1fr);
            gap: 25px;
        }

        .sample-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            overflow: hidden;
            transition: var(--transition-smooth);
            position: relative;
        }

        /* Interactive lift and glow */
        .sample-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 30px rgba(241, 48, 43, 0.08);
            border-color: rgba(241, 48, 43, 0.2);
        }

        .sample-img-container {
            width: 100%;
            position: relative;
            overflow: hidden;
            background: #fdfdfd;
        }

        .sample-img-container img {
            width: 100%;
            height: auto;
            display: block;
            transition: var(--transition-smooth);
        }

        /* Overlay text hidden by default, sliding up on hover */
        .sample-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(17, 11, 11, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: var(--transition-smooth);
        }

        .sample-card:hover .sample-overlay {
            opacity: 1;
        }

        .sample-btn {
            background: var(--brand-red);
            color: #ffffff;
            padding: 8px 18px;
            font-size: 13px;
            text-transform: uppercase;
            font-weight: bold;
            border-radius: 2px;
            text-decoration: none;
            letter-spacing: 0.5px;
            transform: translateY(15px);
            transition: var(--transition-smooth);
        }

        .sample-card:hover .sample-btn {
            transform: translateY(0);
        }

        .sample-info {
            padding: 18px;
            border-top: 1px solid var(--border-color);
        }

        .sample-info h4 {
            font-size: 16px;
            color: var(--primary-black);
            margin-bottom: 8px;
            font-weight: 700;
        }

        .sample-info p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.4;
        }

        /* ==========================================================================
           Desktop Media Queries (自适应响应式转换)
           ========================================================================== */
        @media (min-width: 768px) {
            .section-title { font-size: 32px; }
            
            /* Alternating Grid for Cases */
            .case-row {
                flex-direction: row;
                gap: 50px;
                text-align: left;
            }
            
            /* Even rows swap left/right position */
            .case-row:nth-child(even) {
                flex-direction: row-reverse;
            }

            .case-img-box {
                width: 50%;
            }

            .case-text-box {
                width: 50%;
                padding: 0;
            }

            /* Responsive Grid for Samples */
            .samples-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 30px;
            }
        }