/* CSS 变量与全局重置 */
        html[data-theme="dark"] {
            --primary: #818cf8;
            --primary-dark: #a5b4fc;
            --primary-light: #6366f1;
            --accent: #22d3ee;
            --bg: #0f172a;
            --bg-dark: #020617;
            --text: #e2e8f0;
            --text-light: #94a3b8;
            --white: #1e293b;
            --card-bg: #1e293b;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.35), 0 10px 15px rgba(0, 0, 0, 0.25);
            --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.45);
            --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.55);
            --nav-bg: rgba(15, 23, 42, 0.75);
            --nav-bg-scrolled: rgba(15, 23, 42, 0.92);
            --border-color: rgba(255, 255, 255, 0.08);
            --border-color-light: rgba(255, 255, 255, 0.05);
            --main-gradient: linear-gradient(180deg, #1a1a3e 0%, #0f172a 40%, #1e293b 100%);
            --about-bg: #1e293b;
            --about-gradient: linear-gradient(135deg, #1e1a3a 0%, #0f1a2a 100%);
            --icon-bg-1: #1e1e3a;
            --icon-bg-2: #2a1a3a;
            --icon-bg-3: #1a1a30;
            --check-bg: #0d2818;
            --check-color: #4ade80;
            --btn-outline-border: #334155;
            --input-bg: rgba(255, 255, 255, 0.08);
            --input-border: rgba(255, 255, 255, 0.15);
            --bar-bg: transparent;
            --service-card-border: rgba(255, 255, 255, 0.05);
            --navbar-border: rgba(255, 255, 255, 0.06);
            --about-border: rgba(255, 255, 255, 0.05);
            --mobile-nav-bg: rgba(15, 23, 42, 0.96);
            --mobile-nav-border: rgba(255, 255, 255, 0.06);
            --footer-bg: #020617;
            --footer-text: #94a3b8;
            --footer-heading: #e2e8f0;
        }
        :root {
            --primary: #4f46e5;
            --primary-dark: #3730a3;
            --primary-light: #818cf8;
            --accent: #06b6d4;
            --bg: #f8fafc;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-light: #64748b;
            --white: #ffffff;
            --card-bg: #ffffff;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.07), 0 10px 15px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.15);
            --radius: 16px;
            --radius-sm: 10px;
            --radius-full: 9999px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.7;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        .article-content {
            text-indent: 2em;
            text-align: justify;
            margin-top: 10px;
        }
        .modal-intro {
            font-size: small;
            padding-right: 20px;
            margin-bottom: 10px;
        }
        .article-content-more {
            color: #06b6d4;
            font-size: small;
            margin-top: 10px;
        }

        /* ==================== 深色模式主题变量覆盖 ==================== */
        [data-theme="dark"] {
          --primary: #818cf8;
          --primary-dark: #a5b4fc;
          --primary-light: #6366f1;
          --accent: #22d3ee;
          --bg: #0f172a;
          --bg-dark: #020617;
          --text: #e2e8f0;
          --text-light: #94a3b8;
          --white: #1e293b;
          --card-bg: #1e293b;
          --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
          --shadow: 0 4px 6px rgba(0, 0, 0, 0.35), 0 10px 15px rgba(0, 0, 0, 0.25);
          --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.45);
          --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.55);
          /* 导航栏与边界背景 */
          --navbar-bg: rgba(15, 23, 42, 0.75);
          --navbar-bg-scrolled: rgba(15, 23, 42, 0.92);
          --border-color: rgba(255, 255, 255, 0.08);
          --border-color-light: rgba(255, 255, 255, 0.05);
          /* 主区域渐变 */
          --main-gradient-start: #1a1a3e;
          --main-gradient-mid: #0f172a;
          --main-gradient-end: #1e293b;
          /* 关于我们区域 */
          --about-bg: #1e293b;
          --about-gradient-start: #1e1a3a;
          --about-gradient-mid: #0f1a2a;
          /* 图标背景 */
          --icon-bg-indigo: #1e1e3a;
          --icon-bg-purple: #2a1a3a;
          --icon-bg-violet: #1a1a30;
          --icon-color-indigo: #a5b4fc;
          --icon-color-purple: #d8b4fe;
          --icon-color-violet: #c4b5fd;
          /* 勾选图标 */
          --check-bg: #0d2818;
          --check-color: #4ade80;
          /* 按钮外框 */
          --btn-outline-border: #334155;
          /* 输入框 */
          --input-bg: rgba(255, 255, 255, 0.08);
          --input-border: rgba(255, 255, 255, 0.15);
        }

        /* ==================== 导航栏暗色适配 ==================== */
        [data-theme="dark"] .navbar {
          background: var(--navbar-bg);
          border-bottom: 1px solid var(--border-color);
        }

        [data-theme="dark"] .navbar.scrolled {
          background: var(--navbar-bg-scrolled);
          box-shadow: var(--shadow);
        }

        /* ==================== 主区域渐变背景 ==================== */
        [data-theme="dark"] .main {
          background: linear-gradient(180deg, var(--main-gradient-start) 0%, var(--main-gradient-mid) 40%, var(--main-gradient-end) 100%);
        }

        /* ==================== 服务卡片图标背景适配 ==================== */
        [data-theme="dark"] .service-card:nth-child(1) .icon-box,
        [data-theme="dark"] .service-card:nth-child(2) .icon-box {
          background: var(--icon-bg-indigo);
          color: var(--icon-color-indigo);
        }

        [data-theme="dark"] .service-card:nth-child(3) .icon-box,
        [data-theme="dark"] .service-card:nth-child(4) .icon-box,
        [data-theme="dark"] .service-card:nth-child(5) .icon-box {
          background: var(--icon-bg-purple);
          color: var(--icon-color-purple);
        }

        [data-theme="dark"] .service-card:nth-child(6) .icon-box,
        [data-theme="dark"] .service-card:nth-child(7) .icon-box,
        [data-theme="dark"] .service-card:nth-child(8) .icon-box,
        [data-theme="dark"] .service-card:nth-child(9) .icon-box {
          background: var(--icon-bg-violet);
          color: var(--icon-color-violet);
        }

        /* 边框透明化 */
        [data-theme="dark"] .service-card {
          border: 1px solid var(--border-color-light);
        }

        [data-theme="dark"] .main-card {
          border: 1px solid var(--border-color-light);
        }

        /* ==================== 关于我们区域背景 ==================== */
        [data-theme="dark"] .about-section {
          background: var(--about-bg);
          border-top: 1px solid var(--border-color);
          border-bottom: 1px solid var(--border-color);
        }

        [data-theme="dark"] .about-image {
          background: linear-gradient(135deg, var(--about-gradient-start) 0%, var(--about-gradient-mid) 100%);
        }

        /* ==================== 勾选图标 ==================== */
        [data-theme="dark"] .about-features .check-icon {
          background: var(--check-bg);
          color: var(--check-color);
        }

        /* ==================== 按钮外框 ==================== */
        [data-theme="dark"] .btn-outline {
          border-color: var(--btn-outline-border);
        }

        /* ==================== 输入框 & 联系区域微调 ==================== */
        [data-theme="dark"] .contact-form input {
          background: var(--input-bg);
          border: 1px solid var(--input-border);
        }

        [data-theme="dark"] .contact-form input::placeholder {
          color: #94a3b8;
        }

        /* ==================== 主题切换按钮样式 ==================== */
        .theme-toggle {
          display: inline-flex;
          align-items: center;
          justify-content: center;
          background: transparent;
          border: none;
          border-radius: 50%;
          width: 40px;
          height: 40px;
          cursor: pointer;
          color: var(--text);
          transition: var(--transition-fast);
          margin-left: 0.2rem;
        }

        .theme-toggle:hover {
          background: rgba(79, 70, 229, 0.08);
        }

        .theme-icon {
          display: block;
          transition: transform 0.3s ease, opacity 0.3s ease;
        }

        [data-theme="light"] .sun-icon,
        [data-theme="dark"] .moon-icon {
          display: block;
        }

        [data-theme="light"] .moon-icon,
        [data-theme="dark"] .sun-icon {
          display: none;
        }

        /* 移动端专用：导航栏右侧同时显示汉堡和主题切换 */
        .nav-actions-mobile {
          display: none;
          align-items: center;
          gap: 8px;
        }

        @media (max-width: 768px) {
          .nav-links .theme-toggle {
            display: none; /* 桌面菜单中的切换按钮在移动端隐藏，改用移动端独立按钮 */
          }

          .nav-actions-mobile {
            display: flex;
          }

          .theme-toggle-mobile {
            margin-left: 0;
          }
        }

        /* 移动端菜单背景适配 */
        [data-theme="dark"] #navLinks {
          background: var(--mobile-nav-bg, rgba(15, 23, 42, 0.96));
          border-left: 1px solid var(--border-color);
        }

        /* ==================== 导航栏 ==================== */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.75);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0, 0, 0, 0.06);
            transition: var(--transition);
            padding: 0 2rem;
        }

        .navbar.scrolled {
            box-shadow: var(--shadow);
            background: rgba(255, 255, 255, 0.9);
        }

        .navbar-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.5px;
            transition: var(--transition-fast);
        }

        .nav-logo:hover {
            color: var(--primary-dark);
        }

        .nav-logo .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
            font-weight: 800;
        }

        .nav-links {
            display: flex;
            list-style: none;
            gap: 0.5rem;
            align-items: center;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text);
            font-weight: 500;
            padding: 0.6rem 1.1rem;
            border-radius: var(--radius-full);
            transition: var(--transition-fast);
            position: relative;
            font-size: 0.95rem;
        }

        .nav-links a:hover {
            color: var(--primary);
            background: rgba(79, 70, 229, 0.06);
        }

        .nav-cta {
            background: var(--primary) !important;
            color: white !important;
            padding: 0.65rem 1.5rem !important;
            border-radius: var(--radius-full) !important;
            font-weight: 600 !important;
            transition: var(--transition) !important;
            box-shadow: 0 4px 15px rgba(79, 70, 229, 0.35);
        }

        .nav-cta:hover {
            background: var(--primary-dark) !important;
            box-shadow: 0 6px 20px rgba(79, 70, 229, 0.5) !important;
            transform: translateY(-2px);
        }

        /* 汉堡菜单 */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1001;
            background: none;
            border: none;
            padding: 8px;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text);
            border-radius: 10px;
            transition: var(--transition-fast);
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* 主平台 */
        .main {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 120px 2rem 80px;
            position: relative;
            overflow: hidden;
            background: linear-gradient(180deg, #eef2ff 0%, #f8fafc 40%, #ffffff 100%);
        }

        .main::before {
            content: '';
            position: absolute;
            top: -200px;
            right: -200px;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(79, 70, 229, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .main::after {
            content: '';
            position: absolute;
            bottom: -150px;
            left: -150px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(6, 182, 212, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .main-content {
            max-width: 1200px;
            width: 100%;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .main-text {
            animation: fadeInUp 0.8s ease-out;
        }

        .main-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(79, 70, 229, 0.08);
            color: var(--primary);
            padding: 0.5rem 1.2rem;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 1.5rem;
            letter-spacing: 0.3px;
        }
        .main-badge .dot {
            width: 8px;
            height: 8px;
            background: var(--accent);
            border-radius: 50%;
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.6);
            }
            50% {
                box-shadow: 0 0 0 14px rgba(6, 182, 212, 0);
            }
        }

        .main h1 {
            font-size: 3.5rem;
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -1.5px;
            margin-bottom: 1.2rem;
            color: var(--bg-dark);
        }
        .main h1 .gradient-text {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .main p {
            font-size: 1.15rem;
            color: var(--text-light);
            margin-bottom: 2.5rem;
            max-width: 480px;
            line-height: 1.8;
        }

        .main-buttons {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 0.85rem 2rem;
            font-size: 1rem;
            font-weight: 600;
            border-radius: var(--radius-full);
            cursor: pointer;
            border: none;
            text-decoration: none;
            transition: var(--transition);
            letter-spacing: 0.2px;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: white;
            box-shadow: 0 8px 25px rgba(79, 70, 229, 0.35);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 12px 30px rgba(79, 70, 229, 0.5);
            transform: translateY(-3px);
        }
        .btn-outline {
            background: transparent;
            color: var(--text);
            border: 2px solid #e2e8f0;
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(79, 70, 229, 0.03);
            transform: translateY(-3px);
        }
        .btn-arrow {
            font-size: 1.1rem;
            transition: transform 0.3s;
        }
        .btn:hover .btn-arrow {
            transform: translateX(4px);
        }

        .main-visual {
            display: flex;
            align-items: center;
            justify-content: center;
            animation: fadeInUp 0.8s ease-out 0.2s both;
        }
        .main-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 2.5rem;
            box-shadow: var(--shadow-xl);
            width: 100%;
            max-width: 420px;
            position: relative;
            border: 1px solid rgba(0, 0, 0, 0.04);
        }
        .main-card .mock-chart {
            display: flex;
            align-items: flex-end;
            gap: 12px;
            height: 180px;
            margin-bottom: 1.5rem;
        }
        .main-card .card-label {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--text);
            margin-bottom: 4px;
        }
        .main-card .card-sublabel {
            color: var(--text-light);
            font-size: 0.85rem;
        }
        .main-card .floating-badge {
            position: absolute;
            top: -20px;
            right: -20px;
            background: var(--accent);
            color: white;
            padding: 0.6rem 1.3rem;
            border-radius: var(--radius-full);
            font-weight: 700;
            font-size: 0.9rem;
            box-shadow: var(--shadow-lg);
            animation: float 3s ease-in-out infinite;
        }
        @keyframes float {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-12px);
            }
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* 区域通用样式 */
        .section {
            padding: 100px 2rem;
        }
        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }
        .section-header .section-tag {
            display: inline-block;
            font-weight: 600;
            color: var(--primary);
            font-size: 0.9rem;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 0.8rem;
        }
        .section-header h2 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -1px;
            color: var(--bg-dark);
            margin-bottom: 0.8rem;
        }
        .section-header p {
            color: var(--text-light);
            font-size: 1.1rem;
            max-width: 550px;
            margin: 0 auto;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        /* 服务卡片 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.8rem;
        }
        .service-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 2.5rem 2rem;
            box-shadow: var(--shadow);
            border: 1px solid rgba(0, 0, 0, 0.04);
            transition: var(--transition);
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }
        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            transform: scaleX(0);
            transition: transform 0.4s ease;
            transform-origin: left;
            border-radius: 0 0 4px 0;
        }
        .service-card:hover::before {
            transform: scaleX(1);
        }
        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-xl);
        }
        .service-card .icon-box {
            width: 55px;
            height: 55px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            margin-bottom: 1.3rem;
            transition: var(--transition);
        }
        .service-card:nth-child(1) .icon-box {
            background: #eef2ff;
            color: #4f46e5;
        }
        .service-card:nth-child(2) .icon-box {
            background: #eef2ff;
            color: #4f46e5;
        }
        .service-card:nth-child(3) .icon-box {
            background: #fdf4ff;
            color: #a21caf;
        }
        .service-card:nth-child(4) .icon-box {
            background: #fdf4ff;
            color: #a21caf;
        }
        .service-card:nth-child(5) .icon-box {
            background: #fdf4ff;
            color: #a21caf;
        }
        .service-card:nth-child(6) .icon-box {
            background: #f5f3ff;
            color: #7c3aed;
        }
        .service-card:nth-child(7) .icon-box {
            background: #f5f3ff;
            color: #7c3aed;
        }
        .service-card:nth-child(8) .icon-box {
            background: #f5f3ff;
            color: #7c3aed;
        }
        .service-card:nth-child(9) .icon-box {
            background: #f5f3ff;
            color: #7c3aed;
        }
        .service-card:nth-child(10) .icon-box {
            background: #f5f3ff;
            color: #7c3aed;
        }
        .service-card:nth-child(11) .icon-box {
            background: #f5f3ff;
            color: #7c3aed;
        }
        .service-card:nth-child(12) .icon-box {
            background: #f5f3ff;
            color: #7c3aed;
        }

        .service-card h3 {
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            color: var(--bg-dark);
            transition: var(--transition-fast);
        }
        .service-card:hover h3 {
            color: var(--primary);
        }
        .service-card p {
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 1.5rem;
        }
        .service-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            color: var(--primary);
            text-decoration: none;
            font-size: 0.95rem;
            transition: var(--transition-fast);
            border-bottom: 2px solid transparent;
        }
        .service-link:hover {
            border-bottom-color: var(--primary);
            gap: 10px;
        }
        .modal-intro {
            font-size: small;
            padding-right: 20px;
            margin-bottom: 20px;
        }

        /* 关于我们 */
        .about-section {
            background: var(--white);
            border-top: 1px solid rgba(0,0,0,0.04);
            border-bottom: 1px solid rgba(0,0,0,0.04);
        }
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }
        .about-image {
            background: linear-gradient(135deg, #e0e7ff 0%, #f0f9ff 100%);
            border-radius: var(--radius);
            height: 380px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            position: relative;
            overflow: hidden;
        }
        .about-image .placeholder-icon {
            font-size: 6rem;
            opacity: 0.4;
            color: var(--primary);
        }
        .about-image .experience-badge {
            position: absolute;
            bottom: 20px;
            right: 20px;
            background: var(--white);
            border-radius: var(--radius-sm);
            padding: 1rem 1.5rem;
            box-shadow: var(--shadow);
            text-align: center;
        }
        .experience-badge .number {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
        }
        .about-text h2 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 1.2rem;
            color: var(--bg-dark);
        }
        .about-text .lead {
            font-size: 1.1rem;
            color: var(--text-light);
            margin-bottom: 1.8rem;
            line-height: 1.8;
        }
        .about-features {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 1rem;
            margin-bottom: 2rem;
        }
        .about-features li {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 500;
        }
        .about-features .check-icon {
            width: 28px;
            height: 28px;
            background: #dcfce7;
            color: #16a34a;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
        }

        /* 联系我们 */
        .contact-section {
            background: var(--bg-dark);
            color: white;
            text-align: center;
            padding: 100px 2rem;
            position: relative;
            overflow: hidden;
        }
        .contact-section::before {
            content: '';
            position: absolute;
            top: -100px;
            left: -100px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(79,70,229,0.3) 0%, transparent 70%);
            border-radius: 50%;
        }
        .contact-section .container {
            position: relative;
            z-index: 1;
        }
        .contact-section h2 {
            color: white;
            font-size: 2.6rem;
            font-weight: 800;
            margin-bottom: 1rem;
        }
        .contact-section p {
            color: #cbd5e1;
            font-size: 1.15rem;
            max-width: 550px;
            margin: 0 auto 2.5rem;
        }
        .contact-form {
            display: flex;
            gap: 0.8rem;
            justify-content: center;
            flex-wrap: wrap;
            max-width: 600px;
            margin: 0 auto;
        }
        .contact-form input {
            flex: 1 1 250px;
            padding: 0.9rem 1.5rem;
            border-radius: var(--radius-full);
            border: none;
            font-size: 1rem;
            outline: none;
            background: rgba(255,255,255,0.1);
            color: white;
            border: 1px solid rgba(255,255,255,0.2);
            transition: var(--transition-fast);
        }
        .contact-form input::placeholder {
            color: #94a3b8;
        }
        .contact-form input:focus {
            border-color: var(--primary-light);
            background: rgba(255,255,255,0.15);
        }
        .contact-form .btn-primary {
            padding: 0.9rem 2.2rem;
            background: var(--accent);
            box-shadow: 0 8px 20px rgba(6,182,212,0.4);
        }
        .contact-form .btn-primary:hover {
            background: #0891b2;
            box-shadow: 0 12px 25px rgba(6,182,212,0.6);
        }

        /* 页脚 */
        .footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 3rem 2rem 2rem;
            font-size: 0.95rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2rem;
            max-width: 1200px;
            margin: 0 auto 2.5rem;
        }
        .footer h4 {
            color: white;
            font-weight: 700;
            margin-bottom: 1rem;
            font-size: 1rem;
        }
        .footer a {
            color: #94a3b8;
            text-decoration: none;
            transition: var(--transition-fast);
            display: block;
            margin-bottom: 0.4rem;
        }
        .footer a:hover {
            color: white;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 1.5rem;
            text-align: center;
            max-width: 1200px;
            margin: 0 auto;
            color: #64748b;
        }

        /* 响应式设计 */
        @media (max-width: 1024px) {
            .hero-content {
                grid-template-columns: 1fr;
                text-align: center;
                gap: 2rem;
            }
            .hero p {
                max-width: 100%;
                margin-left: auto;
                margin-right: auto;
            }
            .hero-buttons {
                justify-content: center;
            }
            .services-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .about-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }
            .nav-links {
                position: fixed;
                top: 0;
                right: -100%;
                width: 270px;
                height: 100vh;
                background: rgba(255,255,255,0.95);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 90px 2rem 2rem;
                gap: 0.8rem;
                transition: 0.35s ease;
                box-shadow: var(--shadow-xl);
                border-left: 1px solid rgba(0,0,0,0.05);
                z-index: 999;
            }
            .nav-links.active {
                right: 0;
            }
            .nav-links a {
                display: block;
                text-align: center;
                padding: 0.8rem;
            }
            .hero h1 {
                font-size: 2.6rem;
            }
            .services-grid {
                grid-template-columns: 1fr;
            }
            .contact-form {
                flex-direction: column;
                align-items: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }
        /* ==================== 深色模式主题变量覆盖 ==================== */
        [data-theme="dark"] {
          --primary: #818cf8;
          --primary-dark: #a5b4fc;
          --primary-light: #6366f1;
          --accent: #22d3ee;
          --bg: #0f172a;
          --bg-dark: #020617;
          --text: #e2e8f0;
          --text-light: #94a3b8;
          --white: #1e293b;
          --card-bg: #1e293b;
          --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
          --shadow: 0 4px 6px rgba(0, 0, 0, 0.35), 0 10px 15px rgba(0, 0, 0, 0.25);
          --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.45);
          --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.55);
          /* 导航栏与边界背景 */
          --navbar-bg: rgba(15, 23, 42, 0.75);
          --navbar-bg-scrolled: rgba(15, 23, 42, 0.92);
          --border-color: rgba(255, 255, 255, 0.08);
          --border-color-light: rgba(255, 255, 255, 0.05);
          /* 主区域渐变 */
          --main-gradient-start: #1a1a3e;
          --main-gradient-mid: #0f172a;
          --main-gradient-end: #1e293b;
          /* 关于我们区域 */
          --about-bg: #1e293b;
          --about-gradient-start: #1e1a3a;
          --about-gradient-mid: #0f1a2a;
          /* 图标背景 */
          --icon-bg-indigo: #1e1e3a;
          --icon-bg-purple: #2a1a3a;
          --icon-bg-violet: #1a1a30;
          --icon-color-indigo: #a5b4fc;
          --icon-color-purple: #d8b4fe;
          --icon-color-violet: #c4b5fd;
          /* 勾选图标 */
          --check-bg: #0d2818;
          --check-color: #4ade80;
          /* 按钮外框 */
          --btn-outline-border: #334155;
          /* 输入框 */
          --input-bg: rgba(255, 255, 255, 0.08);
          --input-border: rgba(255, 255, 255, 0.15);
        }

        /* ==================== 导航栏暗色适配 ==================== */
        [data-theme="dark"] .navbar {
          background: var(--navbar-bg);
          border-bottom: 1px solid var(--border-color);
        }

        [data-theme="dark"] .navbar.scrolled {
          background: var(--navbar-bg-scrolled);
          box-shadow: var(--shadow);
        }

        /* ==================== 主区域渐变背景 ==================== */
        [data-theme="dark"] .main {
          background: linear-gradient(180deg, var(--main-gradient-start) 0%, var(--main-gradient-mid) 40%, var(--main-gradient-end) 100%);
        }

        /* ==================== 服务卡片图标背景适配 ==================== */
        [data-theme="dark"] .service-card:nth-child(1) .icon-box,
        [data-theme="dark"] .service-card:nth-child(2) .icon-box {
          background: var(--icon-bg-indigo);
          color: var(--icon-color-indigo);
        }

        [data-theme="dark"] .service-card:nth-child(3) .icon-box,
        [data-theme="dark"] .service-card:nth-child(4) .icon-box,
        [data-theme="dark"] .service-card:nth-child(5) .icon-box {
          background: var(--icon-bg-purple);
          color: var(--icon-color-purple);
        }

        [data-theme="dark"] .service-card:nth-child(6) .icon-box,
        [data-theme="dark"] .service-card:nth-child(7) .icon-box,
        [data-theme="dark"] .service-card:nth-child(8) .icon-box,
        [data-theme="dark"] .service-card:nth-child(9) .icon-box {
          background: var(--icon-bg-violet);
          color: var(--icon-color-violet);
        }

        /* 边框透明化 */
        [data-theme="dark"] .service-card {
          border: 1px solid var(--border-color-light);
        }

        [data-theme="dark"] .main-card {
          border: 1px solid var(--border-color-light);
        }

        /* ==================== 关于我们区域背景 ==================== */
        [data-theme="dark"] .about-section {
          background: var(--about-bg);
          border-top: 1px solid var(--border-color);
          border-bottom: 1px solid var(--border-color);
        }

        [data-theme="dark"] .about-image {
          background: linear-gradient(135deg, var(--about-gradient-start) 0%, var(--about-gradient-mid) 100%);
        }

        /* ==================== 勾选图标 ==================== */
        [data-theme="dark"] .about-features .check-icon {
          background: var(--check-bg);
          color: var(--check-color);
        }

        /* ==================== 按钮外框 ==================== */
        [data-theme="dark"] .btn-outline {
          border-color: var(--btn-outline-border);
        }

        /* ==================== 输入框 & 联系区域微调 ==================== */
        [data-theme="dark"] .contact-form input {
          background: var(--input-bg);
          border: 1px solid var(--input-border);
        }

        [data-theme="dark"] .contact-form input::placeholder {
          color: #94a3b8;
        }

        /* ==================== 主题切换按钮样式 ==================== */
        .theme-toggle {
          display: inline-flex;
          align-items: center;
          justify-content: center;
          background: transparent;
          border: none;
          border-radius: 50%;
          width: 40px;
          height: 40px;
          cursor: pointer;
          color: var(--text);
          transition: var(--transition-fast);
          margin-left: 0.2rem;
        }

        .theme-toggle:hover {
          background: rgba(79, 70, 229, 0.08);
        }

        .theme-icon {
          display: block;
          transition: transform 0.3s ease, opacity 0.3s ease;
        }

        [data-theme="light"] .sun-icon,
        [data-theme="dark"] .moon-icon {
          display: block;
        }

        [data-theme="light"] .moon-icon,
        [data-theme="dark"] .sun-icon {
          display: none;
        }

        /* 移动端专用：导航栏右侧同时显示汉堡和主题切换 */
        .nav-actions-mobile {
          display: none;
          align-items: center;
          gap: 8px;
        }

        @media (max-width: 768px) {
          .nav-links .theme-toggle {
            display: none; /* 桌面菜单中的切换按钮在移动端隐藏，改用移动端独立按钮 */
          }

          .nav-actions-mobile {
            display: flex;
          }

          .theme-toggle-mobile {
            margin-left: 0;
          }
        }

        /* 移动端菜单背景适配 */
        [data-theme="dark"] #navLinks {
          background: var(--mobile-nav-bg, rgba(15, 23, 42, 0.96));
          border-left: 1px solid var(--border-color);
        }

        /* ==================== 修复深色模式下标题文字颜色 ==================== */
        [data-theme="dark"] .main h1,
        [data-theme="dark"] .section-header h2,
        [data-theme="dark"] .service-card h3,
        [data-theme="dark"] .about-text h2,
        [data-theme="dark"] .main .card-label {
          color: var(--text); /* 改为浅色文字 */
        }

        /* 服务卡片悬停状态下的标题颜色保持不变（仍使用 primary） */
        [data-theme="dark"] .service-card:hover h3 {
          color: var(--primary);
        }

        /* 关于我们区域的小标题颜色修正 */
        [data-theme="dark"] .about-text h2 {
          color: var(--text);
        }

        /* ==================== 修复主图卡片图表柱底色 ==================== */
        [data-theme="dark"] .mock-chart .bar {
          background: transparent !important; /* 强制透明，让图片自然融入深色背景 */
        }
        /* ==================== 智能体窗口样式 ==================== */
        .ai-agent-overlay {
          position: fixed;
          top: 0;
          left: 0;
          width: 100%;
          height: 100%;
          background: rgba(0,0,0,0.5);
          display: flex;
          align-items: center;
          justify-content: center;
          z-index: 2000;
          opacity: 0;
          pointer-events: none;
          transition: opacity 0.3s ease;
        }

        .ai-agent-overlay.active {
          opacity: 1;
          pointer-events: auto;
        }

        .ai-agent-dialog {
          background: var(--white);
          border-radius: 16px;
          width: 90%;
          max-width: 460px;
          height: 70vh;
          max-height: 600px;
          display: flex;
          flex-direction: column;
          box-shadow: var(--shadow-xl);
          border: 1px solid var(--border-color-light);
          overflow: hidden;
          transform: translateY(20px);
          transition: transform 0.3s ease;
        }

        .ai-agent-overlay.active .ai-agent-dialog {
          transform: translateY(0);
        }

        .ai-agent-header {
          display: flex;
          justify-content: space-between;
          align-items: center;
          padding: 16px 20px;
          border-bottom: 1px solid var(--border-color-light);
        }

        .ai-agent-header h3 {
          font-size: 1.2rem;
          font-weight: 700;
          color: var(--text);
          margin: 0;
        }

        .agent-close-btn {
          background: none;
          border: none;
          cursor: pointer;
          color: var(--text-light);
          transition: color 0.2s;
        }

        .agent-close-btn:hover {
          color: var(--text);
        }

        .ai-chat-messages {
          flex: 1;
          overflow-y: auto;
          padding: 16px;
          display: flex;
          flex-direction: column;
          gap: 12px;
          background: var(--card-bg);
        }

        .ai-message {
          max-width: 85%;
          padding: 10px 14px;
          border-radius: 12px;
          line-height: 1.5;
          font-size: 0.95rem;
          word-break: break-word;
        }

        .ai-message.bot {
          align-self: flex-start;
          background: rgba(79,70,229,0.1);
          color: var(--text);
        }

        .ai-message.user {
          align-self: flex-end;
          background: var(--primary);
          color: #fff;
        }

        .ai-chat-input-area {
          display: flex;
          padding: 12px 16px;
          border-top: 1px solid var(--border-color-light);
          background: var(--white);
          gap: 8px;
        }

        .ai-chat-input-area input {
          flex: 1;
          padding: 10px 14px;
          border: 1px solid var(--btn-outline-border);
          border-radius: 25px;
          background: var(--input-bg);
          color: var(--text);
          font-size: 0.95rem;
        }

        .ai-chat-input-area input::placeholder {
          color: #94a3b8;
        }

        .ai-chat-input-area button {
          padding: 10px 20px;
          background: var(--primary);
          color: #fff;
          border: none;
          border-radius: 25px;
          font-weight: 600;
          cursor: pointer;
          transition: background 0.2s;
        }

        .ai-chat-input-area button:hover {
          background: var(--primary-dark);
        }

        /* 暗色模式覆盖 */
        [data-theme="dark"] .ai-agent-dialog {
          background: #1e293b;
          border-color: rgba(255,255,255,0.1);
        }

        [data-theme="dark"] .ai-chat-messages {
          background: #0f172a;
        }

        [data-theme="dark"] .ai-chat-input-area {
          background: #1e293b;
          border-top-color: rgba(255,255,255,0.08);
        }

        /* 简单淡入动画 */
        @keyframes fadeIn {
        from { opacity: 0; transform: translateY(-20px); }
        to { opacity: 1; transform: translateY(0); }
        }
        /* ========== 模态窗口样式（了解详情） ========== */
        .modal {
        display: none;               /* 默认隐藏 */
        position: fixed;
        z-index: 2000;               /* 高于导航栏和智能体 */
        left: 0; top: 0;
        width: 100%; height: 100%;
        overflow: auto;
        background: rgba(0, 0, 0, 0.6);
        backdrop-filter: blur(4px);
        }

        .modal-content {
        background: var(--card-bg);
        margin-top: 20px;
        padding: 40px 50px;
        border-radius: var(--radius);
        width: 100%;
        position: relative;
        box-shadow: var(--shadow-xl);
        border: 1px solid var(--border-color-light);
        color: var(--text);
        }

        .modal-close {
        color: var(--text-light);
        position: absolute;
        top: 10px; right: 18px;
        font-size: 2rem;
        font-weight: bold;
        cursor: pointer;
        transition: color 0.2s;
        line-height: 1;
        }

        .modal-close:hover {
        color: var(--text);
        }

        /* 深色模式下确保文字可见 */
        [data-theme="dark"] .modal-content h2 {
        color: var(--text);
        }