:root {
            --primary: #00a8ff;
            --secondary: #192a56;
            --dark: #0c1427;
            --light: #f5f6fa;
            --accent: #9c88ff;
            --card-bg: rgba(255, 255, 255, 0.03);
            --card-hover: rgba(255, 255, 255, 0.07);
            --shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            --transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* 滚动条样式优化 */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--secondary);
        }

        ::-webkit-scrollbar-thumb {
            background: var(--primary);
            border-radius: 4px;
            transition: background 0.3s ease;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--accent);
        }

        /* 鼠标跟随无人机样式 */
        .drone-follower {
            position: fixed !important;
            top: 0 !important;
            left: 0 !important;
            color: var(--primary) !important;
            pointer-events: none !important;
            z-index: 9999 !important;
            opacity: 0.9 !important;
            transition: transform 0.15s ease-out !important;
            transform-origin: center center !important;
            animation: droneFloat 3s infinite ease-in-out !important;
        }

        @keyframes droneFloat {
            0%,100% { transform: translateY(0) rotate(15deg) !important; }
            50% { transform: translateY(-8px) rotate(15deg) !important; }
        }

        /* 模块一：全屏图片 */
        .drone-hero-section {
            position: relative;
            height: 100vh;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .drone-hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            background: linear-gradient(135deg, rgba(12,20,39,0.8) 0%, rgba(25,42,86,0.8) 100%);
        }

        .drone-hero-bg img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            filter: brightness(0.5);
        }

        .drone-hero-content {
            text-align: center;
            max-width: 800px;
            padding: 0 20px;
            animation: fadeInUp 1s ease-out;
        }

        .drone-hero-content h2 {
            font-size: 3.5rem;
            margin-bottom: 20px;
            background: linear-gradient(90deg, var(--light), var(--primary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .drone-hero-content p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.9);
            margin-bottom: 30px;
        }

        /* 模块二/五/六：统一样式（标题置顶+滚动渐显） */
        .drone-hero-section-two {
            position: relative;
            height: 100vh;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
            padding-top: 80px; /* 标题顶部留白 */
        }

        .drone-hero-bg-two {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            /* 背景加半透明遮罩，避免与标题文字重叠看不清 */
            background-color: rgba(12,20,39,0.5);
        }

        .drone-hero-bg-two img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* 模块标题核心样式：解决“看不见”问题 */
        .section-title {
            text-align: center;
            max-width: 1000px;
            margin: 0 auto 40px;
            padding: 0 20px;
            /* 初始状态：透明+下移，确保滚动时渐显 */
            opacity: 0;
            transform: translateY(30px);
            transition: var(--transition);
            /* 层级高于背景，避免被遮挡 */
            z-index: 10;
            position: relative;
        }

        /* 滚动激活后：显示标题 */
        .section-title.active {
            opacity: 1;
            transform: translateY(0);
        }

        .section-title h2 {
            font-size: 2.5rem;
            color: var(--light); /* 明确文字颜色，避免变量失效导致看不见 */
            margin-bottom: 15px;
            font-weight: 700; /* 加粗标题，提升辨识度 */
        }

        .section-title p {
            font-size: 1.1rem;
            color: rgba(255,255,255,0.9); /* 加深描述文字颜色，提升可读性 */
            line-height: 1.6;
        }

        /* 模块三：智能航线规划（img作为video背景） */
        .drone-route-section {
            background-color: var(--dark);
            padding: 120px 0;
        }

        .drone-route-section .container {
            max-width: 1600px;
            width: 100%;
            margin: 0 auto;
            padding: 0 20px;
        }

        .route-container {
            position: relative;
            width: 100%;
            height: 700px;
            border-radius: 12px;
            overflow: hidden;
        }

        .route-media {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }

        .route-media img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
        }

        .route-media video {
            position: absolute;
            top: 10%;
            left: 13%;
            width: 75%;
            height: 80%;
            object-fit: cover;
            z-index: 2;
            opacity: 0.9;
        }

        .route-desc {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            padding: 30px;
            background: linear-gradient(0deg, var(--dark) 0%, transparent 100%);
            z-index: 3;
        }

        .route-desc p {
            color: var(--light);
            font-size: 1rem;
        }

        /* 模块四：灵活任务调度 */
        .drone-task-section {
            background-color: var(--secondary);
            padding: 120px 0;
        }

        .drone-task-section .container {
            max-width: 1200px;
            width: 100%;
            margin: 0 auto;
            padding: 0 20px;
        }

        .task-container {
            display: flex;
            align-items: center;
            gap: 40px;
            margin-bottom: 80px;
        }

        .task-container:last-child {
            margin-bottom: 0;
        }

        .task-media {
            flex: 1;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .task-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }

        .task-media:hover img {
            transform: scale(1.03);
        }

        .task-content {
            flex: 1;
            color: rgba(255,255,255,0.9);
        }

        .task-content p {
            font-size: 1.1rem;
            margin-bottom: 15px;
            line-height: 1.7;
        }

        /* 模块六：场景化算法服务 额外适配 */
        #scenario-algorithm {
            padding-top: 60px;
        }

        /* 页脚样式 */
        footer {
            background-color: var(--dark);
            padding: 80px 0 40px;
            color: rgba(255,255,255,0.7);
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }

        .footer-column h3 {
            font-size: 1.3rem;
            color: var(--light);
            margin-bottom: 20px;
        }

        .footer-column p {
            line-height: 1.6;
            margin-bottom: 15px;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .footer-links a:hover {
            color: var(--primary);
        }

        .footer-column img {
            width: 120px;
            height: auto;
        }

        .copyright {
            max-width: 1200px;
            margin: 40px auto 0;
            padding: 20px 20px 0;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 0.9rem;
        }

        /* 动画关键帧 */
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .drone-hero-content h2 { font-size: 2.5rem; }
            .section-title h2 { font-size: 2rem; }
            .task-container { flex-direction: column; text-align: center; }
            .route-container { height: 400px; }
        }

        @media (max-width: 768px) {
            .drone-hero-content h2 { font-size: 2rem; }
            .drone-hero-content p { font-size: 1rem; }
            .section-title h2 { font-size: 1.8rem; }
            .section-title p { font-size: 1rem; }
            .route-container { height: 300px; }
            .drone-hero-section-two { padding-top: 60px; }
        }