/* --- 1. DJI 风格变量系统 --- */
        :root {
            --dji-black: #000000;
            --dji-dark-grey: #141414;
            --dji-light-grey: #f5f5f5;
            --dji-white: #ffffff;
            --dji-blue: #2a7de1;
            --text-main: #1d1d1f;
            --text-light: #86868b;
            --transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        
        body {
            font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
            background-color: var(--dji-white);
            color: var(--text-main);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        a { text-decoration: none; color: inherit; transition: var(--transition); }
        ul { list-style: none; }

        /* --- 2. 导航栏 --- */
        header {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(0, 0, 0, 0.8);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            transition: var(--transition);
        }

        .nav-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 40px;
            height: 64px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* Logo 样式 */
        .logo {
            display: flex;
            align-items: center;
        }

        .logo img {
            height: 32px; 
            width: auto;
            filter: brightness(0) invert(1); 
            opacity: 0.9; 
            transition: opacity 0.3s;
        }

        .logo img:hover {
            opacity: 1;
        }
        
        .nav-links { display: flex; gap: 40px; }

        .nav-links a {
            color: rgba(255, 255, 255, 0.8);
            font-size: 0.9rem;
            font-weight: 400;
        }

        .nav-links a:hover { color: var(--dji-white); }

        .lang-switch {
            background: transparent;
            color: var(--dji-white);
            border: 1px solid rgba(255,255,255,0.3);
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 0.75rem;
            cursor: pointer;
            transition: var(--transition);
        }

        .lang-switch:hover {
            border-color: var(--dji-white);
            background: rgba(255,255,255,0.1);
        }

        /* --- 3. Hero Banner --- */
        #hero {
            position: relative;
            height: 100vh;
            width: 100%;
            background-color: var(--dji-black);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
        }

        #starfield {
            position: absolute;
            top: 0; left: 0;
            width: 100%; height: 100%;
            z-index: 1;
        }

        .hero-overlay {
            position: absolute;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background: radial-gradient(circle at center, transparent 0%, rgba(0,0,0,0.8) 100%);
            z-index: 2;
        }

        .hero-content {
            position: relative;
            z-index: 3;
            color: var(--dji-white);
            padding: 0 20px;
            max-width: 1000px;
            width: 100%;
            animation: fadeUp 1.5s cubic-bezier(0.19, 1, 0.22, 1);
            transition: max-width 0.3s ease;
        }

        .hero-title {
            font-size: 4rem;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 32px;
            letter-spacing: 4px;
            transition: all 0.3s ease;
            
        }

        .hero-subtitle {
            font-size: 1.5rem;
            color: rgba(255, 255, 255, 0.7);
            font-weight: 300;
            margin-bottom: 48px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.8;
            text-align: center;
        }

        .hero-btns {
            display: flex;
            gap: 20px;
            justify-content: center;
        }

        .btn {
            padding: 12px 32px;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
            border: none;
            display: inline-block; 
            text-align: center;
        }

        .btn-primary {
            background: var(--dji-blue);
            color: white;
        }
        .btn-primary:hover { background: #1e6bd6; }

        .btn-ghost {
            background: rgba(255,255,255,0.1);
            color: white;
            backdrop-filter: blur(5px);
        }
        .btn-ghost:hover { background: rgba(255,255,255,0.2); }
        
        .btn-outline {
            border: 1px solid var(--text-light);
            background: transparent;
            color: var(--text-main);
            margin-top: 20px;
            padding: 8px 24px;
            font-size: 0.9rem;
            cursor: pointer;
        }
        .btn-outline:hover {
            border-color: var(--dji-black);
            background: var(--dji-black);
            color: white;
        }
        
        /* Specific style for black button per request */
        .btn-black {
            background-color: var(--dji-black) !important;
            color: var(--dji-white) !important;
            border-color: var(--dji-black) !important;
        }
        .btn-black:hover {
            background-color: #333 !important;
            border-color: #333 !important;
        }

        /* --- 4. 核心技术 --- */
        #technology {
            background-color: var(--dji-black);
            color: var(--dji-white);
            padding: 120px 0;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .section-header { margin-bottom: 80px; }

        .section-label {
            color: var(--dji-blue);
            font-weight: 600;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 16px;
            display: block;
        }

        .section-title {
            font-size: 3rem;
            font-weight: 600;
            letter-spacing: -1px;
        }

        .tech-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 40px;
        }

        .tech-card {
            background: var(--dji-dark-grey);
            padding: 48px;
            border-radius: 16px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .tech-card:hover {
            transform: translateY(-5px);
            background: #1f1f1f;
        }

        .tech-card h3 {
            font-size: 1.75rem;
            margin-bottom: 12px;
            color: var(--dji-white);
        }

        /* 新增：技术卡片副标题样式 */
        .tech-subtitle {
            font-size: 0.95rem;
            color: var(--dji-blue);
            margin-bottom: 24px;
            font-weight: 500;
            letter-spacing: 0.5px;
            min-height: 2.4em; /* 保证对齐 */
        }

        .tech-card p {
            color: #888;
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 16px;
        }

        /* 新增：技术卡片列表样式 */
        .tech-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .tech-list li {
            /* 修正：使用 flex 布局确保圆点和文字对齐 */
            display: flex;
            align-items: flex-start;
            margin-bottom: 16px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        .tech-list li::before {
            content: '•';
            /* 修正：移除绝对定位，使用 flex item 属性 */
            color: var(--dji-blue);
            font-size: 1.5rem;
            line-height: 1rem; /* 压缩行高以更好对齐 */
            margin-right: 10px;
            transform: translateY(2px); /* 微调垂直位置 */
            flex-shrink: 0;
        }
        
        /* 强调列表项中的标题 */
        .tech-list li strong {
            color: #ccc;
            font-weight: 600;
            margin-right: 4px;
            white-space: nowrap; /* 确保小标题不换行 */
        }

        .tech-line {
            width: 40px;
            height: 3px;
            background: var(--dji-blue);
            margin-bottom: 30px;
        }

        /* --- 5. 解决方案 (产品介绍) --- */
        #solutions {
            background-color: var(--dji-white);
            color: var(--text-main);
            padding: 120px 0;
        }

        .sol-item {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 80px;
            align-items: center;
            margin-bottom: 120px;
        }
        
        .sol-item:last-child { margin-bottom: 0; }
        .sol-item.reverse { direction: rtl; }
        .sol-item.reverse .sol-content { direction: ltr; }

        .sol-img {
            width: 100%;
            height: 450px;
            background: #f5f5f7;
            border-radius: 12px;
            position: relative;
            overflow: hidden;
        }
        
        .sol-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        
        .sol-img::after {
            display: none; 
        }

        .sol-content h3 {
            font-size: 2.5rem;
            font-weight: 600;
            margin-bottom: 24px;
            color: var(--dji-black);
        }

        .sol-content p {
            color: var(--text-light);
            font-size: 1.125rem;
            margin-bottom: 32px;
        }

        .feature-list li {
            display: flex;
            align-items: flex-start; /* 修改：确保多行文本时对齐第一行 */
            margin-bottom: 16px;
            color: var(--text-main);
            font-weight: 500;
            line-height: 1.6; /* 明确行高 */
        }
        
        .feature-list li::before {
            content: '';
            width: 6px; height: 6px;
            background: var(--dji-blue);
            border-radius: 50%;
            margin-right: 15px;
            flex-shrink: 0;
            /* 修改：下移圆点以对齐第一行文本的视觉中心 (行高26px-圆点6px)/2 = 10px */
            margin-top: 10px; 
        }

        /* --- 5.5 合作伙伴 --- */
        .partners-section {
            padding: 60px 0;
            background-color: var(--dji-white);
            border-top: 1px solid #eee;
            border-bottom: 1px solid #eee;
            overflow: hidden;
            position: relative;
        }

        .partners-title {
            text-align: center;
            font-size: 1.125rem;
            letter-spacing: 2px;
            margin-bottom: 40px;
            color: var(--text-light);
            text-transform: uppercase;
            font-weight: 600;
        }

        .logo-slider {
            display: flex;
            width: max-content; /*fit-content*/
            animation: scroll 50s linear infinite;
            will-change: transform;
        }

        .logo-slider:hover {
            animation-play-state: paused;
        }

        .partner-logo {
            flex: 0 0 200px; 
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 30px;
            padding: 0;
            filter: none;
            transition: var(--transition);
        }

        .partner-logo:hover {
            filter: none;
            transform: scale(1.5);
        }

        .partner-logo img {
            width: 100%;
            height: 100%;
            
            object-fit: contain;
            display: block;

        }

        @keyframes scroll {
            0% { transform: translateX(0); }
            100% { transform: translateX(var(--scroll-width)); }/*100% { transform: translateX(-50%); }*/
        }

        /* --- 6. 关于我们 --- */
        #about {
            background-color: #f9f9f9;
            padding: 120px 0;
        }

        .about-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 80px;
            align-items: center;
        }

        .about-text {
            color: var(--text-main);
        }

        .about-text p {
            margin-bottom: 24px;
            font-size: 1.05rem;
            color: var(--text-light);
            text-align: justify;
        }

        .about-img-placeholder {
            width: 100%;
            aspect-ratio: 4/3; 
            background-color: #e5e5e5;
            border-radius: 12px;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #999;
            font-weight: 600;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1); 
        }

        .about-img-placeholder img {
            width: 100%;
            height: 100%;
            object-fit: cover; 
            display: block; 
        }

        /* --- 7. 联系表单 (Moved to Modal, styles kept generic) --- */
        /* Note: Original #contact-form section styles are removed/adapted for modal use */

        .form-container-modal {
            /* Styles adapted for modal usage */
            background: #fff;
            padding: 10px;
        }

        .form-group {
            margin-bottom: 24px;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-main);
        }

        .form-input, .form-textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 1rem;
            transition: all 0.3s;
            font-family: inherit;
            background: #fff;
        }

        .form-input:focus, .form-textarea:focus {
            outline: none;
            border-color: var(--dji-blue);
            box-shadow: 0 0 0 3px rgba(42, 125, 225, 0.1);
        }

        .form-textarea {
            height: 120px; /* Slightly reduced for modal */
            resize: vertical;
        }

        .form-hint {
            font-size: 0.85rem;
            color: #999;
            margin-top: 6px;
            display: block;
            text-align: right;
        }

        .form-submit-btn {
            width: 100%;
            padding: 14px;
            background: var(--dji-blue);
            color: white;
            border: none;
            border-radius: 4px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
            margin-top: 10px;
        }

        .form-submit-btn:hover {
            background: #1e6bd6;
        }


        /* --- 8. 数据展示 --- */
        #stats {
            background-color: var(--dji-dark-grey);
            padding: 100px 0;
            color: var(--dji-white);
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        
        .stats-container {
            display: flex;
            justify-content: space-between;
            max-width: 1000px;
            margin: 0 auto;
        }

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

        .stat-number {
            display: block;
            font-size: 4rem;
            font-weight: 700;
            background: linear-gradient(to bottom, #fff, #999);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 10px;
        }

        .stat-label {
            font-size: 1rem;
            color: #888;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        /* --- 9. 页脚 --- */
        footer {
            background-color: #000;
            color: #888;
            padding: 80px 0 40px;
            font-size: 0.85rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 60px;
            padding: 0 24px;
            max-width: 1200px;
            margin: 0 auto 60px;
        }

        .footer-brand h4 {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 20px;
        }

        .footer-col h5 {
            color: white;
            margin-bottom: 20px;
            font-size: 0.9rem;
        }

        .footer-col p { margin-bottom: 10px; transition: color 0.3s; cursor: pointer; }
        .footer-col p:hover { color: white; }

        /* 二维码列样式 */
        .footer-qr {
            display: flex;
            flex-direction: column;
            align-items: flex-start; /* 或者 center */
        }
        
        .footer-qr img {
            width: 120px;
            height: auto;
            border-radius: 4px;
            border: 1px solid rgba(255,255,255,0.1);
        }

        .copyright {
            text-align: center;
            border-top: 1px solid #222;
            padding-top: 40px;
            max-width: 1200px;
            margin: 0 auto;
        }

        /* --- 10. 模态框样式 --- */
        .modal-overlay {
            display: none; 
            position: fixed;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background: rgba(0, 0, 0, 0.8);
            z-index: 2000;
            justify-content: center;
            align-items: center;
            animation: fadeIn 0.3s ease;
            backdrop-filter: blur(5px);
        }

        .video-wrapper {
            width: 80%;
            max-width: 1000px;
            aspect-ratio: 16 / 9;
            background: #000;
            position: relative;
            box-shadow: 0 20px 50px rgba(0,0,0,0.5);
            border-radius: 12px;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* 修改 iframe 样式，使其默认隐藏，避免空白占位 */
        .video-wrapper iframe { 
            width: 100%; 
            height: 100%; 
            border: none; 
            display: none; 
        }

        /* 新增 video 标签样式 */
        .video-wrapper video {
            width: 100%;
            height: 100%;
            object-fit: contain; /* 保持比例 */
            display: none;
            outline: none;
        }

        .content-modal-wrapper {
            width: 90%;
            max-width: 900px;
            height: auto;
            max-height: 90vh; /* Auto height with limit */
            background: white;
            border-radius: 12px;
            position: relative;
            display: flex;
            flex-direction: column;
            overflow: hidden;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
        }

        .modal-header {
            padding: 24px 32px;
            border-bottom: 1px solid #eee;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #fff;
            z-index: 10;
        }

        .modal-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--dji-black);
        }

        .modal-body {
            padding: 32px;
            overflow-y: auto; 
            flex: 1;
            color: var(--text-main);
        }

        .close-modal-btn {
            font-size: 2rem;
            color: #888;
            cursor: pointer;
            line-height: 1;
            transition: 0.3s;
        }
        .close-modal-btn:hover { color: #000; }
        
        .product-detail-section { margin-bottom: 40px; }
        .product-detail-section h3 {
            font-size: 1.2rem;
            color: var(--dji-blue);
            margin-bottom: 16px;
            border-left: 4px solid var(--dji-blue);
            padding-left: 12px;
        }
        
        .detail-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .detail-item {
            background: #f9f9f9;
            padding: 20px;
            border-radius: 8px;
        }
        
        .detail-item h4 {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: #000;
        }
        .detail-item p {
            font-size: 0.9rem;
            color: #555;
            line-height: 1.5;
        }

        .specs-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.9rem;
        }
        .specs-table th, .specs-table td {
            padding: 12px;
            border-bottom: 1px solid #eee;
            text-align: left;
        }
        .specs-table th {
            width: 35%;
            color: #888;
            font-weight: 500;
        }
        .specs-table td {
            font-weight: 600;
            color: #000;
        }
        .sr-only {
           position: absolute;
           width: 1px;
           height: 1px;
           padding: 0;
           margin: -1px;
           overflow: hidden;
           clip: rect(0, 0, 0, 0);
           white-space: nowrap;
           border-width: 0;
        }


        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        /* --- 11. 英文版面专属优化 --- */
        body.lang-en, body.lang-es, body.lang-pt {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            letter-spacing: -0.01em; 
        }

        body.lang-en h1, body.lang-es h1, body.lang-pt h1,
        body.lang-en h2, body.lang-es h2, body.lang-pt h2,
        body.lang-en h3, body.lang-es h3, body.lang-pt h3 {
            font-weight: 700; 
            line-height: 1.15;
        }

        body.lang-en .hero-content, 
        body.lang-es .hero-content, 
        body.lang-pt .hero-content {
            max-width: 95vw; 
            width: 1400px; 
        }

        body.lang-en .hero-title,
        body.lang-es .hero-title, 
        body.lang-pt .hero-title {
            font-size: 2.75rem; 
            font-weight: 800; 
            line-height: 1.1; 
            letter-spacing: -0.02em; 
            white-space: normal; 
            margin-bottom: 24px; 
        }

        body.lang-en .hero-subtitle, 
        body.lang-es .hero-subtitle, 
        body.lang-pt .hero-subtitle {
            font-size: 1.25rem;
            max-width: 800px;
            line-height: 1.5;
        }

        body.lang-en .btn, body.lang-en .form-submit-btn,
        body.lang-es .btn, body.lang-es .form-submit-btn,
        body.lang-pt .btn, body.lang-pt .form-submit-btn {
            text-transform: uppercase;
            font-size: 0.9rem;
            letter-spacing: 0.5px;
            font-weight: 600;
        }

        /* 移除之前可能存在的冲突规则，使用全局统一对齐 */
        body.lang-en .feature-list li,
        body.lang-es .feature-list li,
        body.lang-pt .feature-list li {
            /* 保持 line-height 即可，align-items 已在全局设置 */
            line-height: 1.5;
        }
        /* =========================================
         阿拉伯语 (RTL) 专属样式
        ========================================= */
        html[dir="rtl"] {
            text-align: right; /* 全局文本强制右对齐 */
        }

        /* 推荐系统阿拉伯语字体兜底 */
        body.lang-ar {
            font-family: 'Segoe UI', 'Tahoma', 'Arial', sans-serif;
            letter-spacing: 0; /* 阿拉伯语连体字，不能有字母间距 */
        }

        body.lang-ar .hero-title {
            font-size: 2.8rem; /* 阿语标题稍微大一点更好看 */
            line-height: 1.3;
        }

        body.lang-ar .hero-subtitle {
            font-size: 1.4rem;
        }

        /* 处理按钮和标签的反向Margin（如果存在的话）*/
        html[dir="rtl"] .nav-links a {
            margin-left: 0;
            margin-right: 2rem; /* 导航链接间距翻转 */
        }

        html[dir="rtl"] .modal-header .close-modal-btn {
            right: auto;
            left: 20px; /* 弹窗关闭按钮挪到左边 */
        }

        /* =========================================
           修复阿拉伯语 (RTL) 下的滚动合作商 Bug
           ========================================= */
        /* 1. 强制整个父容器保持 LTR（从左向右）排版。
        这会让 .logo-slider 的起跑线重新回到最左侧，防止往左拉伸时右侧露白 */
            html[dir="rtl"] .partners-section {
                direction: ltr !important; 
            }

            /* 2. 单独让标题恢复 RTL，保证阿拉伯语阅读顺序和标点符号位置正确 */
            html[dir="rtl"] .partners-title {
                direction: rtl !important; 
            }

            /* 3. 神来之笔：反转动画！
               虽然物理排版是 LTR，但我们让动画倒放，实现“从左向右滚”，
               完美迎合阿拉伯人的视觉习惯，并且 0% 到 100% 的循环依然无缝！ */
            html[dir="rtl"] .logo-slider {
                animation-direction: reverse !important; 
            }

        /* 响应式 */
        @media (max-width: 768px) {
            .hero-title { font-size: 1.75rem; line-height: 1.3; }
            body.lang-en .hero-title, body.lang-es .hero-title, body.lang-pt .hero-title { font-size: 1.6rem; word-break: keep-all; } 
            .hero-subtitle { font-size: 1rem; }
            .nav-links { display: none; }
            .sol-item, .sol-item.reverse { grid-template-columns: 1fr; direction: ltr; }
            .sol-item.reverse .sol-content { direction: ltr; }
            .about-container { grid-template-columns: 1fr; } 
            .form-row { grid-template-columns: 1fr; gap: 0; }
            .stats-container { flex-direction: column; gap: 40px; }
            .footer-grid { grid-template-columns: 1fr; }
            .video-wrapper, .content-modal-wrapper { width: 95%; }
            .detail-grid { grid-template-columns: 1fr; }
            
            /* 新增合作伙伴手机端尺寸适配 */
            .partner-logo { flex: 0 0 120px; margin: 0 20px; height: 40px; }
            .partners-section { padding: 40px 0; }
        }

        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(50px); }
            to { opacity: 1; transform: translateY(0); }
        }