/* ===== Inter 字体（本地化，离线可用） ===== */
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 400; font-display: swap; src: url('../fonts/inter-latin-400.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 500; font-display: swap; src: url('../fonts/inter-latin-500.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 600; font-display: swap; src: url('../fonts/inter-latin-600.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 700; font-display: swap; src: url('../fonts/inter-latin-700.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 800; font-display: swap; src: url('../fonts/inter-latin-800.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }

        /* ============================================================
           ===== CSS 变量：统一管理配色与尺寸，方便后续修改 =====
           ============================================================ */
        :root {
            --color-primary: #1E3A8A;          /* 主色：深蓝 */
            --color-primary-light: #60A5FA;    /* 浅蓝：hover/强调 */
            --color-primary-dark: #0F172A;    /* 更深的星际蓝 */
            --color-heading: #F8FAFC;         /* 标题主色：接近白 */
            --color-heading-soft: #E2E8F0;    /* 次级标题/浅标题 */
            --color-secondary: #3B82F6;        /* 辅助色：亮蓝 */
            --color-accent: #2563EB;           /* 强调色/CTA：深蓝 */
            --color-accent-dark: #1D4ED8;      /* 深蓝 hover 加深 */
            --color-bg: #0F172A;               /* 页面背景色：深蓝暗色 */
            --color-card: rgba(30,41,59,0.85); /* 卡片背景：深色半透明 */
            --color-text: #E2E8F0;             /* 正文字体色：浅灰 */
            --color-text-secondary: #CBD5E1;   /* 副文本色 */
            --color-border: rgba(255,255,255,0.15); /* 边框半透明 */
            --color-success: #10B981;          /* 成功/解法色 */
            --color-danger: #EF4444;           /* 痛点色 */

            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;

            --shadow-sm: 0 2px 8px rgba(26, 42, 74, 0.06);
            --shadow-md: 0 8px 24px rgba(26, 42, 74, 0.10);
            --shadow-lg: 0 16px 40px rgba(26, 42, 74, 0.15);

            --container-width: 1200px;
            --nav-height: 72px;

            --font-cn: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --font-en: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
        }

        /* ============================================================
           ===== 基础重置 =====
           ============================================================ */
        * { margin: 0; padding: 0; box-sizing: border-box; }

        html { scroll-behavior: smooth; }

        body {
            font-family: var(--font-en);
            color: var(--color-text);
            background:
                radial-gradient(circle at top left, rgba(59,130,246,0.16), transparent 28%),
                radial-gradient(circle at top right, rgba(37,99,235,0.12), transparent 22%),
                linear-gradient(180deg, #0b1220 0%, var(--color-bg) 28%, #0b1324 100%);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -webkit-tap-highlight-color: transparent;  /* 去除移动端点击高亮 */
            -webkit-text-size-adjust: 100%;            /* 防止 iOS 横屏字号自动放大 */
            overflow-x: hidden;
            overflow-wrap: break-word;                 /* 长文本自动换行，防止小屏溢出 */
        }

        a { text-decoration: none; color: inherit; }
        ul { list-style: none; }
        img { max-width: 100%; display: block; }
        button { font-family: inherit; cursor: pointer; border: none; background: none; }

        /* ============================================================
           ===== 通用布局工具类 =====
           ============================================================ */
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .section {
            padding: 96px 0;
            background: linear-gradient(180deg, rgba(30,41,59,0.84), rgba(15,23,42,0.92));
            backdrop-filter: blur(8px);
            border-radius: var(--radius-sm);
            margin: 24px 0;
            border: 1px solid rgba(255,255,255,0.06);
        }

        .section-title {
            font-size: 36px;
            font-weight: 800;
            color: var(--color-heading);
            text-align: center;
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .section-subtitle {
            font-size: 17px;
            color: var(--color-text-secondary);
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }

        /* ===== 通用按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 32px;
            font-size: 16px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: all 0.25s ease;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-primary {
            background-color: var(--color-accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
        }
        .btn-primary:hover {
            background-color: var(--color-accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(59, 130, 246, 0.45);
        }
        .btn-outline {
            background-color: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.6);
        }
        .btn-outline:hover {
            background-color: var(--color-card);
            color: var(--color-accent);
            border-color: var(--color-card);
            transform: translateY(-2px);
        }
        .btn-large { padding: 18px 40px; font-size: 17px; }

        /* ============================================================
           ===== 滚动渐入动画 =====
           ============================================================ */
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .reveal {
            opacity: 0;
            transform: translateY(18px);
            transition: opacity 0.7s ease, transform 0.7s ease;
        }
        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
            animation: fadeInUp 0.7s ease forwards;
        }

        /* ============================================================
           ===== 1. 固定顶部导航 =====
           ============================================================ */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background-color: var(--color-primary-dark);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border);
            z-index: 1000;
            transition: box-shadow 0.3s ease, background-color 0.3s ease;
        }
        .nav-menu a {
            color: var(--color-text);
        }
        .nav-logo {
            color: var(--color-text);
        }
        .navbar.scrolled {
            box-shadow: var(--shadow-sm);
        }
        .nav-inner {
            max-width: var(--container-width);
            height: 100%;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .nav-logo {
            font-size: 20px;
            font-weight: 800;
            color: var(--color-heading);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
        }
        .nav-logo .logo-img {
            height: 48px;
            width: auto;
            object-fit: contain;
        }
        .nav-logo .logo-text {
            font-size: 20px;
            color: var(--color-heading);
            margin-left: 12px;
            font-weight: 800;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-menu a {
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text);
            border-radius: 6px;
            transition: color 0.2s ease, background-color 0.2s ease;
        }
        .nav-menu a:hover {
            color: var(--color-primary-light); /* improved contrast */
            background-color: var(--color-bg);
        }
        .nav-cta {
            margin-left: 12px;
            padding: 10px 22px;
            font-size: 14px;
        }
        .nav-toggle {
            display: none;
            font-size: 24px;
            color: var(--color-heading);
        }

        /* ============================================================
           ===== 2. 英雄区 =====
           ============================================================ */
        .hero {
            position: relative;
            overflow: hidden;
            padding: 180px 0 120px;
            text-align: center;
            color: #fff;
            background:
                radial-gradient(circle at top, rgba(96,165,250,0.18), transparent 32%),
                linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
        }
        /* 装饰性光晕 */
        .hero::before {
            content: "";
            position: absolute;
            top: -120px;
            right: -120px;
            width: 560px;
            height: 560px;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.18) 0%, transparent 70%);
            border-radius: 50%;
        }
        .hero::after {
            content: "";
            position: absolute;
            bottom: -150px;
            left: -100px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(44, 74, 124, 0.4) 0%, transparent 70%);
            border-radius: 50%;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 820px;
        }
        .trust-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: rgba(59, 130, 246, 0.15);
            border: 1px solid rgba(59, 130, 246, 0.4);
            color: var(--color-accent);
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 28px;
        }
        .hero h1 {
            font-size: 52px;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 24px;
        }
        .hero h1 .accent-text {
            color: var(--color-accent);
        }
        .hero-subtitle {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.8;
            margin-bottom: 40px;
            max-width: 780px;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            margin-bottom: 48px;
            flex-wrap: wrap;
        }
        .trust-bar {
            display: flex;
            align-items: center;
            gap: 24px;
            font-size: 15px;
            color: rgba(255, 255, 255, 0.8);
            flex-wrap: wrap;
        }
        .trust-bar span {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .trust-bar i { color: var(--color-accent); }

        /* ============================================================
           ===== 3. 数据统计栏 =====
           ============================================================ */
        .stats {
            background-color: var(--color-primary);
            padding: 64px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .stat-item {
            padding: 16px;
            border-right: 1px solid rgba(255, 255, 255, 0.1);
        }
        .stat-item:last-child { border-right: none; }
        .stat-number {
            font-size: 48px;
            font-weight: 800;
            color: var(--color-accent);
            line-height: 1;
            margin-bottom: 12px;
        }
        .stat-label {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.75);
        }

        /* ============================================================
           ===== 4. 痛点/解决方案对比 =====
           ============================================================ */
        .pain-compare .compare-list {
            max-width: 900px;
            margin: 0 auto;
        }
        .compare-item {
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            align-items: center;
            gap: 20px;
            background: var(--color-card);
            border-radius: var(--radius-md);
            padding: 24px;
            margin-bottom: 16px;
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }
        .compare-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .pain-point {
            color: var(--color-text-secondary);
            font-size: 15px;
        }
        .pain-point .icon {
            color: var(--color-danger);
            font-weight: 700;
            margin-right: 6px;
        }
        .compare-arrow {
            color: var(--color-accent);
            font-size: 20px;
        }
        .solution {
            color: var(--color-text);
            font-size: 15px;
            font-weight: 500;
        }
        .solution .icon {
            color: var(--color-success);
            font-weight: 700;
            margin-right: 6px;
        }
        .transition-line {
            text-align: center;
            font-size: 20px;
            font-weight: 700;
            color: var(--color-heading);
            margin-top: 48px;
            line-height: 1.6;
        }

        /* ============================================================
           ===== 5. 核心优势（四栏卡片）=====
           ============================================================ */
        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .advantage-card {
            background: linear-gradient(180deg, rgba(30,41,59,0.9), rgba(15,23,42,0.96));
            backdrop-filter: blur(8px);
            border-radius: var(--radius-md);
            padding: 40px 32px;
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
            border-top: 4px solid transparent;
        }
        .advantage-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
            border-top-color: var(--color-accent);
        }
        .advantage-icon {
            width: 64px;
            height: 64px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            margin-bottom: 24px;
        }
        .advantage-card h3 {
            font-size: 21px;
            font-weight: 700;
            color: var(--color-heading);
            margin-bottom: 12px;
        }
        .advantage-card p {
            color: var(--color-text-secondary);
            font-size: 15px;
            line-height: 1.8;
        }

        /* ============================================================
           ===== 6. 核心业务服务（四宫格企业卡片）=====
           ============================================================ */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .service-card {
            background: linear-gradient(180deg, rgba(30,41,59,0.88), rgba(15,23,42,0.96));
            border-radius: var(--radius-md);
            padding: 32px 28px;
            text-align: left;
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
            border: 1px solid var(--color-border);
            display: flex;
            flex-direction: column;
        }
        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 14px 32px rgba(0,0,0,0.55);
            border-color: var(--color-accent);
        }
        .service-card-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 20px;
        }
        .service-icon-box {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: rgba(37, 99, 235, 0.15);
            color: var(--color-primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
        }
        .service-badge {
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 50px;
            background: rgba(59, 130, 246, 0.12);
            color: var(--color-primary-light);
            border: 1px solid rgba(96, 165, 250, 0.25);
        }
        .service-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-heading);
            margin-bottom: 18px;
            line-height: 1.4;
        }
        .service-blocks {
            display: flex;
            flex-direction: column;
            gap: 12px;
            flex: 1;
        }
        .service-block {
            padding: 12px 14px;
            background: rgba(15, 23, 42, 0.65);
            border-radius: var(--radius-sm);
            border-left: 3px solid var(--color-border);
        }
        .service-block.highlight {
            border-left-color: var(--color-accent);
            background: rgba(37, 99, 235, 0.08);
        }
        .service-block-label {
            font-size: 13px;
            font-weight: 700;
            color: var(--color-heading-soft);
            margin-bottom: 4px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .service-block.highlight .service-block-label {
            color: var(--color-primary-light);
        }
        .service-block-text {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            margin: 0;
            text-align: justify;
            text-justify: inter-ideograph;
            word-break: break-word;
            text-wrap: pretty;
        }
        .services-footer {
            text-align: center;
            margin-top: 40px;
            font-size: 17px;
            color: var(--color-text-secondary);
            font-weight: 500;
        }
        .services-footer span { color: var(--color-primary-light); font-weight: 700; }

        /* ============================================================
           ===== 7. 精选标杆实战案例（三段式交付）=====
           ============================================================ */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .case-card {
            background: linear-gradient(180deg, rgba(30,41,59,0.88), rgba(15,23,42,0.96));
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
            display: flex;
            flex-direction: column;
            border: 1px solid var(--color-border);
        }
        .case-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 14px 34px rgba(0,0,0,0.6);
            border-color: var(--color-accent);
        }
        .case-body {
            padding: 30px 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .case-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 12px;
            gap: 12px;
        }
        .case-tag-industry {
            display: inline-block;
            background: rgba(59, 130, 246, 0.14);
            color: var(--color-primary-light);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 50px;
            border: 1px solid rgba(96, 165, 250, 0.25);
        }
        .case-badge-type {
            font-size: 12px;
            color: var(--color-success);
            background: rgba(16, 185, 129, 0.1);
            padding: 3px 10px;
            border-radius: 4px;
            font-weight: 600;
        }
        .case-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-heading);
            margin-bottom: 18px;
            line-height: 1.45;
        }
        .case-flow {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-bottom: 20px;
            flex: 1;
        }
        .case-flow-item {
            padding: 12px 14px;
            background: rgba(15, 23, 42, 0.65);
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255, 255, 255, 0.06);
        }
        .case-flow-item.value {
            background: rgba(16, 185, 129, 0.08);
            border-color: rgba(16, 185, 129, 0.24);
        }
        .case-flow-label {
            font-size: 13px;
            font-weight: 700;
            margin-bottom: 4px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .case-flow-item:not(.value) .case-flow-label {
            color: var(--color-primary-light);
        }
        .case-flow-item.value .case-flow-label {
            color: var(--color-success);
        }
        .case-flow-desc {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            margin: 0;
            text-align: justify;
            text-justify: inter-ideograph;
            word-break: break-word;
            text-wrap: pretty;
        }
        .case-tags {
            margin-top: auto;
            padding-top: 14px;
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            border-top: 1px dashed rgba(255,255,255,0.08);
        }
        .case-tags span {
            font-size: 12px;
            color: var(--color-primary-light);
            background: rgba(59, 130, 246, 0.1);
            padding: 4px 10px;
            border-radius: 4px;
        }
        .cases-footer {
            text-align: center;
            margin-top: 40px;
            font-size: 15px;
            color: var(--color-text-secondary);
        }
        .cases-footer i { color: var(--color-success); margin-right: 6px; }

        /* ============================================================
           ===== 8. 商业交付保障与承诺（打消老板疑虑）=====
           ============================================================ */
        .guarantees-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-bottom: 48px;
        }
        .guarantee-card {
            background: linear-gradient(180deg, rgba(30,41,59,0.88), rgba(15,23,42,0.96));
            border-radius: var(--radius-md);
            padding: 34px 26px;
            border: 1px solid var(--color-border);
            border-top: 4px solid var(--color-accent);
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }
        .guarantee-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 14px 34px rgba(0,0,0,0.5);
            border-color: var(--color-primary-light);
        }
        .guarantee-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            background: rgba(37, 99, 235, 0.15);
            color: var(--color-primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            margin-bottom: 22px;
        }
        .guarantee-card h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--color-heading);
            margin-bottom: 12px;
            line-height: 1.4;
        }
        .guarantee-card p {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.75;
            margin: 0;
        }

        /* 价值对比矩阵表 */
        .compare-matrix-box {
            background: linear-gradient(180deg, rgba(30,41,59,0.85), rgba(15,23,42,0.96));
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow-x: auto;
            box-shadow: var(--shadow-sm);
        }
        .compare-matrix {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 680px;
        }
        .compare-matrix th, .compare-matrix td {
            padding: 18px 22px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            font-size: 14px;
            vertical-align: middle;
        }
        .compare-matrix th {
            background: rgba(15, 23, 42, 0.85);
            color: var(--color-heading);
            font-weight: 700;
        }
        .compare-matrix th.highlight-col, .compare-matrix td.highlight-col {
            background: rgba(37, 99, 235, 0.12);
            border-left: 2px solid var(--color-accent);
            border-right: 2px solid var(--color-accent);
            color: #fff;
            font-weight: 600;
        }
        .compare-matrix th.highlight-col {
            color: var(--color-primary-light);
            font-size: 15px;
        }
        .compare-matrix tr:last-child td {
            border-bottom: none;
        }
        .compare-matrix .tag-warn {
            color: var(--color-danger);
            font-weight: 500;
        }
        .compare-matrix .tag-ok {
            color: var(--color-success);
            font-weight: 600;
        }

        /* ============================================================
           ===== 9. 合作与结算模式（灵活性）=====
           ============================================================ */
        .modes-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .mode-card {
            background: linear-gradient(180deg, rgba(30,41,59,0.88), rgba(15,23,42,0.96));
            border-radius: var(--radius-md);
            padding: 36px 28px;
            border: 1px solid var(--color-border);
            display: flex;
            flex-direction: column;
            position: relative;
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }
        .mode-card:hover {
            transform: translateY(-8px);
            border-color: var(--color-primary-light);
            box-shadow: 0 16px 36px rgba(0,0,0,0.5);
        }
        .mode-card.featured {
            border-color: var(--color-accent);
            background: linear-gradient(180deg, rgba(37,99,235,0.14), rgba(15,23,42,0.98));
        }
        .mode-badge {
            align-self: flex-start;
            font-size: 12px;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 50px;
            background: rgba(59, 130, 246, 0.15);
            color: var(--color-primary-light);
            margin-bottom: 16px;
        }
        .mode-card.featured .mode-badge {
            background: var(--color-accent);
            color: #fff;
        }
        .mode-card h3 {
            font-size: 21px;
            font-weight: 700;
            color: var(--color-heading);
            margin-bottom: 12px;
        }
        .mode-desc {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            margin-bottom: 22px;
        }
        .mode-features {
            list-style: none;
            padding: 0;
            margin: 0 0 28px 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
            flex: 1;
        }
        .mode-features li {
            font-size: 14px;
            color: var(--color-text);
            display: flex;
            align-items: flex-start;
            gap: 10px;
            line-height: 1.6;
        }
        .mode-features li i {
            color: var(--color-success);
            margin-top: 3px;
            flex-shrink: 0;
        }
        .mode-card .btn {
            margin-top: auto;
            width: 100%;
            text-align: center;
        }

        /* ============================================================
           ===== 9. 客户证言 =====
           ============================================================ */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .testimonial-card {
            background: linear-gradient(180deg, rgba(30,41,59,0.84), rgba(15,23,42,0.96));
            border-radius: var(--radius-md);
            padding: 32px;
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s ease, box-shadow 0.25s ease;
            position: relative;
        }
        .testimonial-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.5);
        }
        .quote-icon {
            font-size: 32px;
            color: var(--color-accent);
            opacity: 0.4;
            margin-bottom: 12px;
        }
        .testimonial-text {
            font-size: 15px;
            color: var(--color-text);
            line-height: 1.85;
            margin-bottom: 20px;
            font-style: italic;
        }
        .testimonial-author {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-heading);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .testimonial-author::before {
            content: "";
            width: 32px;
            height: 2px;
            background: var(--color-accent);
        }
        .testimonials-footer {
            text-align: center;
            margin-top: 36px;
            font-size: 14px;
            color: var(--color-text-secondary);
        }

        /* ============================================================
           ===== 10. 关于我们 =====
           ============================================================ */
        .about-inner {
            max-width: 860px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 48px;
            align-items: start;
        }
        .about-title-side h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--color-heading);
            line-height: 1.4;
        }
        .about-title-side .badge {
            display: inline-block;
            margin-top: 16px;
            padding: 6px 16px;
            background: rgba(59, 130, 246, 0.12);
            color: var(--color-accent);
            font-size: 13px;
            font-weight: 600;
            border-radius: 50px;
        }
        .about-text {
            font-size: 16px;
            color: var(--color-text-secondary);
            line-height: 2;
        }
        .about-text p { margin-bottom: 18px; }
        .about-text strong { color: var(--color-heading-soft); }

        /* ============================================================
           ===== 11. 合作流程（四步）=====
           ============================================================ */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        /* 连接线 */
        .process-grid::before {
            content: "";
            position: absolute;
            top: 36px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: var(--color-border);
            z-index: 0;
        }
        .process-step {
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .process-number {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: var(--color-card);
            border: 3px solid var(--color-accent);
            color: var(--color-primary);
            font-size: 24px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s ease, background-color 0.25s ease, color 0.25s ease;
        }
        .process-step:hover .process-number {
            transform: scale(1.08);
            background: var(--color-accent);
            color: #fff;
        }
        .process-step h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-heading);
            margin-bottom: 8px;
        }
        .process-step p {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            padding: 0 8px;
        }

        /* ============================================================
           ===== 12. FAQ 折叠 =====
           ============================================================ */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: linear-gradient(180deg, rgba(30,41,59,0.84), rgba(15,23,42,0.96));
            border-radius: var(--radius-md);
            margin-bottom: 14px;
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: box-shadow 0.25s ease;
        }
        .faq-item.active { box-shadow: var(--shadow-md); }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 22px 28px;
            font-size: 16px;
            font-weight: 600;
            color: var(--color-heading);
            text-align: left;
            gap: 16px;
        }
        .faq-question .faq-icon {
            color: var(--color-accent);
            font-size: 18px;
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-item.active .faq-icon { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
        }
        .faq-answer-inner {
            padding: 0 28px 24px;
            font-size: 15px;
            color: var(--color-text-secondary);
            line-height: 1.85;
        }

        /* ============================================================
           ===== 13. 底部行动区 =====
           ============================================================ */
        .cta-section {
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
            padding: 88px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: "";
            position: absolute;
            top: -80px;
            left: 50%;
            transform: translateX(-50%);
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, transparent 70%);
            border-radius: 50%;
        }
        .cta-section h2 {
            position: relative;
            font-size: 38px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            position: relative;
            font-size: 17px;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 36px;
        }

        /* ============================================================
           ===== 14. 页脚 =====
           ============================================================ */
        .footer {
            background-color: #0F1B33;
            color: rgba(255, 255, 255, 0.7);
            padding: 48px 0;
        }
        .footer-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 14px;
        }
        .footer-company {
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 4px;
        }
        .footer-info span { margin-right: 20px; display: inline-flex; align-items: center; gap: 6px; }
        .footer-info i { color: var(--color-accent); }
        .footer-info a { color: inherit; text-decoration: none; transition: color 0.2s ease; }
        .footer-info a:hover { color: var(--color-accent); }

        /* ============================================================
           ===== 15. 联系方式弹窗 Modal =====
           ============================================================ */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(15, 27, 51, 0.6);
            backdrop-filter: blur(4px);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 2000;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
            padding: 24px;
        }
        .modal-overlay.active {
            opacity: 1;
            visibility: visible;
        }
        .modal {
            background: linear-gradient(180deg, rgba(30,41,59,0.96), rgba(15,23,42,0.98));
            border-radius: var(--radius-lg);
            padding: 40px;
            max-width: 480px;
            width: 100%;
            position: relative;
            transform: translateY(20px) scale(0.98);
            transition: transform 0.3s ease;
            max-height: 90vh;
            overflow-y: auto;
        }
        .modal-overlay.active .modal {
            transform: translateY(0) scale(1);
        }
        .modal-close {
            position: absolute;
            top: 18px;
            right: 18px;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--color-bg);
            color: var(--color-text-secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            transition: background-color 0.2s ease, color 0.2s ease;
        }
        .modal-close:hover {
            background: var(--color-danger);
            color: #fff;
        }
        .modal h3 {
            font-size: 24px;
            font-weight: 800;
            color: var(--color-heading);
            margin-bottom: 8px;
        }
        .modal-desc {
            font-size: 14px;
            color: var(--color-text-secondary);
            margin-bottom: 28px;
        }
        /* 微信二维码 */
        .qr-box {
            display: flex;
            justify-content: center;
            margin-bottom: 10px;
        }
        .qr-placeholder {
            width: 200px;
            height: 200px;
            background: var(--color-bg);
            border: 2px dashed var(--color-border);
            border-radius: var(--radius-md);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 12px;
            color: var(--color-text-secondary);
        }
        .qr-placeholder i {
            font-size: 56px;
            color: #07C160; /* 微信绿 */
        }
        .qr-placeholder span {
            font-size: 14px;
        }
        /* 真实二维码图片样式（替换占位框后生效） */
        .qr-img {
            width: 200px;
            height: 200px;
            border-radius: var(--radius-md);
            object-fit: cover;
            border: 1px solid var(--color-border);
        }
        .qr-tip {
            text-align: center;
            font-size: 14px;
            color: var(--color-text-secondary);
            margin-bottom: 12px;
        }
        .qr-remark-box {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 8px;
            background: linear-gradient(135deg, rgba(37, 99, 235, 0.16), rgba(16, 185, 129, 0.12));
            border: 1px dashed rgba(96, 165, 250, 0.45);
            padding: 9px 16px;
            border-radius: var(--radius-sm);
            margin: 0 auto 24px;
            font-size: 14px;
            color: var(--color-heading-soft);
        }
        .qr-remark-box .remark-label {
            display: flex;
            align-items: center;
            gap: 6px;
            color: var(--color-primary-light);
            font-weight: 600;
        }
        .qr-remark-box .remark-val {
            color: #fff;
            background: var(--color-accent);
            padding: 2px 10px;
            border-radius: 4px;
            font-weight: 700;
            letter-spacing: 0.5px;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
        }
        .qr-remark-box .remark-sub {
            font-size: 12px;
            color: var(--color-success);
            font-weight: 500;
        }

        /* 联系方式 */
        .contact-methods {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-bottom: 16px;
        }
        .contact-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 16px 20px;
            background: var(--color-bg);
            border-radius: var(--radius-md);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
        .contact-item:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }
        .contact-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            flex-shrink: 0;
        }
        .contact-info {
            display: flex;
            flex-direction: column;
        }
        .contact-label {
            font-size: 13px;
            color: var(--color-text-secondary);
        }
        .contact-value {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-heading);
        }
        .contact-note {
            text-align: center;
            font-size: 13px;
            color: var(--color-text-secondary);
        }
        .contact-note i { color: var(--color-accent); margin-right: 4px; }

        /* ============================================================
           ===== 响应式：平板 (≤1024px) =====
           ============================================================ */
        @media (max-width: 1024px) {
            .hero h1 { font-size: 42px; }
            .advantages-grid,
            .cases-grid,
            .services-grid,
            .guarantees-grid,
            .modes-grid { grid-template-columns: repeat(2, 1fr); }
            .contract-scenarios { grid-template-columns: 1fr; }
            .process-grid { grid-template-columns: repeat(2, 1fr); gap: 40px 24px; }
            .process-grid::before { display: none; }
            .about-inner { grid-template-columns: 1fr; gap: 24px; }

            /* 平板及以下启用汉堡菜单，避免导航项挤压换行 */
            .nav-toggle { display: block; }
            .nav-menu {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                width: 100%;
                background: rgba(15,23,42,0.96);
                flex-direction: column;
                align-items: stretch;
                padding: 16px 24px;
                gap: 4px;
                box-shadow: var(--shadow-md);
                transform: translateY(-150%);
                transition: transform 0.3s ease;
                max-height: calc(100vh - var(--nav-height));
                overflow-y: auto;
            }
            .nav-menu.active { transform: translateY(0); }
            .nav-menu a { padding: 14px 12px; font-size: 16px; border-bottom: 1px solid var(--color-border); }
            .nav-cta { margin: 12px 0 4px; text-align: center; }
        }

        /* ============================================================
           ===== 响应式：移动端 (≤768px) =====
           ============================================================ */
        @media (max-width: 768px) {
            .section { padding: 64px 0; }
            .section-title { font-size: 28px; }
            .section-subtitle { font-size: 15px; margin-bottom: 40px; }

            /* 英雄区 */
            .hero { min-height: auto; padding: 120px 0 80px; }
            .hero h1 { font-size: 32px; }
            .hero-subtitle { font-size: 16px; }
            .hero-buttons { flex-direction: column; }
            .hero-buttons .btn { width: 100%; }
            .trust-bar { flex-direction: column; align-items: flex-start; gap: 12px; }

            /* 数据栏 */
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px 12px; }
            .stat-item { border-right: none; }
            .stat-number { font-size: 38px; }

            /* 痛点对比 */
            .compare-item {
                grid-template-columns: 1fr;
                gap: 12px;
                text-align: left;
            }
            .compare-arrow { transform: rotate(90deg); justify-self: start; }
            .transition-line { font-size: 17px; }

            /* 各类 grid 单列 */
            .advantages-grid,
            .cases-grid,
            .services-grid,
            .testimonials-grid,
            .process-grid,
            .guarantees-grid,
            .modes-grid { grid-template-columns: 1fr; }

            .cta-section h2 { font-size: 28px; }
            .modal { padding: 28px 24px; }
            .footer-inner { flex-direction: column; text-align: center; }
            .footer-info span { margin: 4px 10px; }
        }

        /* ============================================================
           ===== 响应式：小屏手机 (≤480px) =====
           ============================================================ */
        @media (max-width: 480px) {
            .container { padding: 0 18px; }              /* 收窄边距，充分利用小屏 */
            .section { padding: 56px 0; }
            .section-title { font-size: 24px; }
            .section-subtitle { font-size: 14px; margin-bottom: 32px; }

            /* 导航 logo 缩小，避免与汉堡按钮挤在一行 */
            .nav-logo { font-size: 17px; gap: 8px; }
            .nav-logo .logo-icon { width: 32px; height: 32px; font-size: 16px; }
            .nav-inner { padding: 0 18px; }

            /* 英雄区 */
            .hero { padding: 110px 0 64px; }
            .hero h1 { font-size: 27px; }
            .hero-subtitle { font-size: 15px; margin-bottom: 32px; }
            .trust-badge { font-size: 12px; padding: 7px 14px; margin-bottom: 22px; }
            .hero-buttons { gap: 12px; margin-bottom: 36px; }
            .btn-large { padding: 15px 28px; font-size: 16px; }
            .trust-bar { font-size: 13px; gap: 10px; }

            /* 数据栏 */
            .stats { padding: 48px 0; }
            .stat-number { font-size: 32px; }
            .stat-label { font-size: 13px; }

            /* 卡片内边距收窄 */
            .advantage-card { padding: 30px 22px; }
            .service-card { padding: 28px 18px; }
            .case-body { padding: 22px; }
            .testimonial-card { padding: 24px; }
            .faq-question { padding: 18px 20px; font-size: 15px; }
            .faq-answer-inner { padding: 0 20px 20px; font-size: 14px; }

            /* 痛点对比 */
            .compare-item { padding: 18px; }
            .transition-line { font-size: 16px; }

            /* CTA / Modal */
            .cta-section h2 { font-size: 24px; }
            .cta-section p { font-size: 15px; }
            .modal { padding: 26px 20px; }
            .modal h3 { font-size: 21px; }

            /* 关于我们 */
            .about-title-side h2 { font-size: 25px; }
            .about-text { font-size: 15px; line-height: 1.85; }

            /* 页脚 */
            .footer { padding: 36px 0; }
        }

        /* ============================================================
           ===== 响应式：超小屏 (≤380px，iPhone SE / 小屏安卓) =====
           ============================================================ */
        @media (max-width: 380px) {
            .hero h1 { font-size: 24px; }
            .hero-subtitle { font-size: 14px; }
            .section-title { font-size: 22px; }
            .stat-number { font-size: 28px; }
            .stats-grid { gap: 28px 8px; }
            .cta-section h2 { font-size: 22px; }
            .btn-large { padding: 14px 20px; font-size: 15px; }
            /* 二维码在小屏略微缩小，避免弹窗过满 */
            .qr-placeholder, .qr-img { width: 180px; height: 180px; }
            .qr-placeholder i { font-size: 48px; }
        }