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

        :root {
            --primary: #0F3460;
            --accent: #165DFF;
            --accent-light: #E8F0FF;
            --bg-main: #F8FAFC;
            --bg-white: #FFFFFF;
            --text-main: #1E293B;
            --text-sub: #64748B;
            --border: #E2E8F0;
            --shadow: 0 4px 20px rgba(15, 52, 96, 0.06);
            --shadow-hover: 0 12px 40px rgba(15, 52, 96, 0.12);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-main);
            color: var(--text-main);
            line-height: 1.7;
            overflow-x: hidden;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
        }

        /* ---------- 通用区块 ---------- */
        .section {
            padding: 90px 0;
            position: relative;
        }

        .section-gray {
            background: var(--bg-white);
        }

        .section-label {
            display: inline-block;
            font-size: 13px;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 14px;
            font-weight: 500;
        }

        .section-title {
            font-size: 36px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 18px;
            line-height: 1.3;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-sub);
            max-width: 720px;
            margin-bottom: 60px;
        }

        .text-center {
            text-align: center;
        }

        .text-center .section-desc {
            margin-left: auto;
            margin-right: auto;
        }

        /* ---------- 首屏英雄区 ---------- */
        .hero {
            position: relative;
            height: 680px;
            display: flex;
            align-items: center;
            color: #fff;
            /* ⚠️ 改图位置：替换首屏背景图，建议偏远地区卫星站+太阳能板高清实景图 */
            background: 
                linear-gradient(135deg, rgba(15, 52, 96, 0.1) 0%, rgba(22, 93, 255, 0.1) 100%),
                url('//ueeshop.ly200-cdn.com/u_file/UPBH/UPBH996/2606/05/photo/8a49e17a64.png') center/cover no-repeat;
            overflow: hidden;
        }

        /* 首屏文字靠左排列 */
        .hero .container {
            margin-left: 8vw;
            margin-right: auto;
        }

        .hero::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 780px;
            text-align: left;
        }

        .hero h1 {
            font-size: 50px;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 22px;
        }

        .hero .subtitle {
            font-size: 17px;
            color: rgba(255,255,255,0.85);
            margin-bottom: 36px;
            max-width: 720px;
            line-height: 1.8;
        }

        .hero-badges {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 44px;
            justify-content: flex-start;
        }

        .hero-badges span {
            padding: 8px 22px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.25);
            border-radius: 50px;
            font-size: 14px;
            backdrop-filter: blur(8px);
        }

        .cta-primary {
            display: inline-block;
            padding: 15px 46px;
            background: #fff;
            color: var(--primary);
            text-decoration: none;
            border-radius: 6px;
            font-size: 16px;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }

        .cta-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
        }

        /* ---------- 应用场景 ---------- */
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .scenario-card {
            padding: 34px 26px;
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: 12px;
            transition: all 0.35s ease;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .scenario-card:hover {
            transform: translateY(-6px);
            border-color: var(--accent);
            box-shadow: var(--shadow-hover);
        }

        .scenario-icon {
            width: 54px;
            height: 54px;
            background: var(--accent-light);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 22px;
            font-size: 26px;
            /* ⚠️ 改图位置：场景卡片图标，建议替换为SVG线性图标 */
        }

        .scenario-card h3 {
            font-size: 18px;
            color: var(--primary);
            margin-bottom: 10px;
            font-weight: 600;
        }

        .scenario-card p {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.7;
        }

        /* ---------- 供电挑战 ---------- */
        .challenge-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 26px;
        }

        .challenge-item {
            padding: 30px;
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: 12px;
            border-left: 4px solid var(--accent);
            box-shadow: var(--shadow);
        }

        .challenge-item h4 {
            font-size: 18px;
            color: var(--primary);
            margin-bottom: 10px;
            font-weight: 600;
        }

        .challenge-item p {
            font-size: 15px;
            color: var(--text-sub);
            line-height: 1.7;
        }

        /* ---------- 系统架构 ---------- */
        .arch-components {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 26px;
        }

        .arch-comp {
            padding: 28px 24px;
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: 10px;
            transition: all 0.3s ease;
            box-shadow: var(--shadow);
        }

        .arch-comp:hover {
            border-color: var(--accent);
        }

        .arch-comp h4 {
            font-size: 17px;
            color: var(--primary);
            margin-bottom: 10px;
            font-weight: 600;
        }

        .arch-comp p {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.7;
        }

        /* ---------- 设计流程 ---------- */
        .process-wrap {
            position: relative;
        }

        .process-line {
            position: absolute;
            top: 45px;
            left: 8%;
            right: 8%;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-light), var(--accent), var(--accent-light));
            z-index: 0;
            border-radius: 2px;
        }

        .process-steps {
            display: flex;
            justify-content: space-between;
            position: relative;
            z-index: 1;
        }

        .step-item {
            text-align: center;
            flex: 1;
            padding: 0 12px;
        }

        .step-circle {
            width: 90px;
            height: 90px;
            margin: 0 auto 22px;
            background: var(--bg-white);
            border: 3px solid var(--accent);
            border-radius: 50%;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 22px;
            font-weight: 700;
            box-shadow: 0 6px 20px rgba(22, 93, 255, 0.15);
        }

        .step-circle small {
            font-size: 11px;
            letter-spacing: 1px;
            margin-top: 2px;
            font-weight: 400;
        }

        .step-item h4 {
            font-size: 16px;
            color: var(--primary);
            margin-bottom: 8px;
            font-weight: 600;
        }

        .step-item p {
            font-size: 13px;
            color: var(--text-sub);
            line-height: 1.6;
        }

        /* ---------- 配置方案 ---------- */
        .config-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .config-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: 14px;
            overflow: hidden;
            transition: all 0.35s ease;
            box-shadow: var(--shadow);
        }

        .config-card:hover {
            transform: translateY(-5px);
            border-color: var(--accent);
            box-shadow: var(--shadow-hover);
        }

        .config-img {
            height: 220px;
            background: var(--accent-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 15px;
            border-bottom: 1px solid var(--border);
            /* ⚠️ 改图位置：配置方案产品实拍图 */
        }

        .config-body {
            padding: 30px;
        }

        .config-body h3 {
            font-size: 22px;
            color: var(--primary);
            margin-bottom: 18px;
            font-weight: 600;
        }

        .config-spec {
            list-style: none;
        }

        .config-spec li {
            padding: 11px 0;
            border-bottom: 1px solid var(--border);
            display: flex;
            justify-content: space-between;
            font-size: 15px;
        }

        .config-spec li:last-child {
            border-bottom: none;
        }

        .config-spec li span:first-child {
            color: var(--text-sub);
        }

        .config-spec li span:last-child {
            color: var(--primary);
            font-weight: 500;
        }

        .config-tag {
            display: inline-block;
            padding: 4px 12px;
            background: var(--accent-light);
            color: var(--accent);
            border-radius: 4px;
            font-size: 12px;
            font-weight: 500;
            margin-bottom: 14px;
        }

        /* ---------- 配置计算器 ---------- */
        .calculator-wrap {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 48px 50px;
            box-shadow: var(--shadow);
        }

        .calc-form {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-bottom: 32px;
        }

        .calc-item label {
            display: block;
            font-size: 14px;
            color: var(--text-sub);
            margin-bottom: 8px;
            font-weight: 500;
        }

        .calc-item input {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 15px;
            color: var(--text-main);
            outline: none;
            transition: border-color 0.3s;
        }

        .calc-item input:focus {
            border-color: var(--accent);
        }

        .calc-btn {
            grid-column: span 3;
            padding: 14px;
            background: var(--accent);
            color: #fff;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            transition: background 0.3s;
        }

        .calc-btn:hover {
            background: #0F46CC;
        }

        .calc-result {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            padding-top: 32px;
            border-top: 1px solid var(--border);
        }

        .result-card {
            text-align: center;
            padding: 24px;
            background: var(--accent-light);
            border-radius: 10px;
        }

        .result-card .num {
            font-size: 28px;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 6px;
        }

        .result-card .label {
            font-size: 14px;
            color: var(--text-sub);
        }

        .calc-tip {
            margin-top: 20px;
            font-size: 13px;
            color: var(--text-sub);
            text-align: center;
        }

        /* ---------- 支持设备 ---------- */
        .device-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .device-box {
            padding: 32px;
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: 12px;
            box-shadow: var(--shadow);
        }

        .device-box h4 {
            font-size: 18px;
            color: var(--primary);
            margin-bottom: 16px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .device-box h4::before {
            content: "";
            width: 4px;
            height: 18px;
            background: var(--accent);
            border-radius: 2px;
        }

        .device-box ul {
            list-style: none;
        }

        .device-box li {
            padding: 8px 0;
            color: var(--text-sub);
            font-size: 15px;
            padding-left: 20px;
            position: relative;
        }

        .device-box li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--accent);
            font-weight: bold;
        }

        .device-note {
            margin-top: 24px;
            padding: 16px 20px;
            background: #FFFBEB;
            border-left: 3px solid #F59E0B;
            border-radius: 4px;
            font-size: 14px;
            color: #92400E;
        }

        /* ---------- 电池对比 ---------- */
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .compare-table th,
        .compare-table td {
            padding: 18px 24px;
            text-align: left;
            border-bottom: 1px solid var(--border);
        }

        .compare-table th {
            background: var(--accent-light);
            color: var(--primary);
            font-weight: 600;
            font-size: 16px;
        }

        .compare-table td {
            color: var(--text-sub);
            font-size: 15px;
        }

        .compare-table tr:last-child td {
            border-bottom: none;
        }

        .compare-table .highlight {
            color: var(--accent);
            font-weight: 600;
        }

        /* ---------- 核心优势 ---------- */
        .advantage-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .adv-card {
            padding: 38px 30px;
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: 12px;
            transition: all 0.35s ease;
            box-shadow: var(--shadow);
        }

        .adv-card:hover {
            border-color: var(--accent);
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }

        .adv-icon {
            width: 58px;
            height: 58px;
            margin-bottom: 22px;
            background: var(--accent-light);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            /* ⚠️ 改图位置：优势板块图标 */
        }

        .adv-card h4 {
            font-size: 18px;
            color: var(--primary);
            margin-bottom: 12px;
            font-weight: 600;
        }

        .adv-card p {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.8;
        }

        /* ---------- 常见问题 ---------- */
        .faq-list {
            max-width: 960px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: 10px;
            margin-bottom: 16px;
            padding: 26px 30px;
            transition: all 0.3s ease;
            box-shadow: var(--shadow);
        }

        .faq-item:hover {
            border-color: var(--accent);
        }

        .faq-item h4 {
            font-size: 17px;
            color: var(--primary);
            margin-bottom: 10px;
            font-weight: 600;
        }

        .faq-item p {
            color: var(--text-sub);
            font-size: 15px;
            line-height: 1.8;
        }

        /* ---------- 底部CTA ---------- */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            color: #fff;
            text-align: center;
            padding: 90px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.1) 0%, transparent 40%);
            pointer-events: none;
        }

        .cta-section h2 {
            font-size: 34px;
            margin-bottom: 18px;
            font-weight: 700;
            position: relative;
            z-index: 1;
        }

        .cta-section p {
            font-size: 16px;
            color: rgba(255,255,255,0.8);
            max-width: 640px;
            margin: 0 auto 36px;
            line-height: 1.8;
            position: relative;
            z-index: 1;
        }

        .cta-section .cta-primary {
            position: relative;
            z-index: 1;
        }

        /* ---------- 响应式 ---------- */
        @media (max-width: 1024px) {
            .hero .container {
                margin: 0 auto;
            }
            .scenario-grid, .arch-components, .advantage-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .challenge-grid, .calc-form, .calc-result {
                grid-template-columns: repeat(2, 1fr);
            }
            .calc-btn {
                grid-column: span 2;
            }
            .hero h1 {
                font-size: 38px;
            }
            .section-title {
                font-size: 28px;
            }
            .process-steps {
                flex-wrap: wrap;
                gap: 30px;
            }
            .process-line {
                display: none;
            }
            .step-item {
                flex: 0 0 45%;
            }
        }

        @media (max-width: 640px) {
            .container {
                padding: 0 20px;
            }
            .scenario-grid, .challenge-grid, .arch-components,
            .config-grid, .device-grid, .advantage-grid,
            .calc-form, .calc-result {
                grid-template-columns: 1fr;
            }
            .calc-btn {
                grid-column: span 1;
            }
            .hero {
                height: auto;
                padding: 100px 0;
            }
            .hero h1 {
                font-size: 30px;
            }
            .section {
                padding: 60px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .step-item {
                flex: 0 0 100%;
            }
            .calculator-wrap {
                padding: 30px 24px;
            }
            .compare-table {
                display: block;
                overflow-x: auto;
            }
        }