:root {
            --primary-color: #003366;
            --accent-color: #e67e23;
            --bg-light: #f4f7f6;
            --border-color: #e0e0e0;
            --text-dark: #333333;
            --text-light: #555555;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-dark);
            background: var(--bg-light);
        }

        .container {
            max-width: 1150px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Page Header */
        .page-header {
            background: white;
            padding: 50px 40px;
            margin: 30px 0 25px;
            border-radius: 8px;
            border-top: 6px solid var(--accent-color);
            box-shadow: 0 8px 25px rgba(0, 51, 102, 0.12);
        }

        .page-header h1 {
            color: var(--primary-color);
            font-size: 2.4em;
            font-weight: 700;
            margin-bottom: 15px;
            letter-spacing: -0.5px;
        }

        .page-header .intro-text {
            color: var(--text-light);
            font-size: 1.05em;
            line-height: 1.8;
        }

        /* Main Content Area */
        .content-block {
            background: white;
            padding: 40px;
            margin-bottom: 25px;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
        }

        .content-block h2 {
            color: var(--primary-color);
            font-size: 1.5em;
            font-weight: 700;
            margin-bottom: 25px;
            padding-bottom: 12px;
            border-bottom: 3px solid var(--accent-color);
        }

        .content-block p {
            color: var(--text-light);
            margin-bottom: 20px;
            line-height: 1.8;
        }

        /* Application Box */
        .application-box {
            background: linear-gradient(135deg, #e8f4f8 0%, #d4e9f2 100%);
            border-left: 5px solid var(--primary-color);
            padding: 25px 30px;
            margin: 30px 0;
            border-radius: 6px;
            box-shadow: 0 3px 10px rgba(0, 51, 102, 0.1);
        }

        .application-box p {
            color: var(--text-dark);
            font-weight: 500;
            margin-bottom: 0;
        }

        /* Technical Info Box */
        .technical-note {
            background: linear-gradient(135deg, #fff5e6 0%, #ffe8cc 100%);
            border-left: 5px solid var(--accent-color);
            padding: 25px 30px;
            margin: 30px 0;
            border-radius: 6px;
            box-shadow: 0 3px 10px rgba(230, 126, 35, 0.12);
        }

        .technical-note p {
            color: var(--text-dark);
            font-weight: 500;
            margin-bottom: 0;
        }

        /* Image Gallery */
        .image-gallery {
            margin: 35px 0;
            display: grid;
            gap: 25px;
        }

        .image-item {
            background: var(--bg-light);
            padding: 25px;
            border-radius: 8px;
            border: 2px solid var(--border-color);
            text-align: center;
            transition: all 0.3s ease;
        }

        .image-item:hover {
            border-color: var(--accent-color);
            box-shadow: 0 8px 20px rgba(230, 126, 35, 0.15);
            transform: translateY(-3px);
        }

        .image-item img {
            max-width: 100%;
            height: auto;
            border-radius: 6px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }

        /* Features List */
        .features-list {
            list-style: none;
            margin: 30px 0;
            padding: 0;
        }

        .features-list li {
            background: var(--bg-light);
            padding: 22px 28px 22px 65px;
            margin-bottom: 18px;
            border-radius: 8px;
            border-left: 4px solid var(--accent-color);
            transition: all 0.3s ease;
            position: relative;
            color: var(--text-light);
            line-height: 1.7;
        }

        .features-list li:hover {
            transform: translateX(8px);
            box-shadow: 0 5px 15px rgba(230, 126, 35, 0.2);
            background: white;
        }

        .features-list li::before {
            content: "◆";
            position: absolute;
            left: 25px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--accent-color);
            font-size: 24px;
            font-weight: bold;
        }

        /* Two Column Layout */
        .two-column-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin: 30px 0;
        }

        .column-card {
            background: white;
            padding: 30px;
            border-radius: 8px;
            border: 2px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .column-card:hover {
            border-color: var(--primary-color);
            box-shadow: 0 6px 20px rgba(0, 51, 102, 0.12);
        }

        .column-card h3 {
            color: var(--primary-color);
            font-size: 1.2em;
            font-weight: 700;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent-color);
        }

        .column-card p {
            color: var(--text-light);
            margin-bottom: 0;
            line-height: 1.7;
        }

        /* Safety Banner */
        .safety-banner {
            background: linear-gradient(135deg, var(--primary-color) 0%, #004080 100%);
            color: white;
            padding: 35px 40px;
            margin: 25px 0 30px;
            border-radius: 8px;
            box-shadow: 0 6px 20px rgba(0, 51, 102, 0.2);
            text-align: center;
        }

        .safety-banner h3 {
            font-size: 1.4em;
            font-weight: 700;
            margin-bottom: 15px;
            letter-spacing: 0.5px;
        }

        .safety-banner p {
            font-size: 1.05em;
            line-height: 1.8;
            opacity: 0.95;
            margin-bottom: 0;
        }

        /* Specification Tag */
        .spec-tag {
            display: inline-block;
            background: var(--accent-color);
            color: white;
            padding: 6px 15px;
            border-radius: 20px;
            font-size: 0.9em;
            font-weight: 600;
            margin: 5px 5px 5px 0;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                padding: 0 15px;
            }

            .page-header {
                padding: 35px 25px;
                margin: 20px 0;
            }

            .page-header h1 {
                font-size: 1.8em;
            }

            .content-block {
                padding: 25px 20px;
            }

            .content-block h2 {
                font-size: 1.3em;
            }

            .features-list li {
                padding: 18px 22px 18px 55px;
            }

            .features-list li::before {
                left: 18px;
                font-size: 20px;
            }

            .two-column-grid {
                grid-template-columns: 1fr;
            }

            .safety-banner {
                padding: 25px 20px;
            }
        }

        @media (max-width: 480px) {
            body {
                font-size: 15px;
            }

            .page-header {
                padding: 25px 20px;
            }

            .page-header h1 {
                font-size: 1.6em;
            }

            .content-block {
                padding: 20px 15px;
            }

            .application-box,
            .technical-note {
                padding: 20px;
            }

            .image-item {
                padding: 15px;
            }
        }