/* =========================================
   1. 全局配置 & 变量 (Variables)
   ========================================= */
:root {
    /* 核心品牌色 */
    --primary-color: #F37021;       /* 品牌橙 */
    --primary-glow: rgba(243, 112, 33, 0.4);
    
    /* 科技辅助色 */
    --tech-cyan: #00f0ff;           /* 赛博青 (用于边框/高亮) */
    --tech-cyan-dim: rgba(0, 240, 255, 0.15);
    --tech-blue: #0056b3;           /* 深蓝 (用于背景装饰) */
    
    /* 文字颜色 */
    --text-main: #333333;           /* 主页面深色字 */
    --text-light: #ffffff;          /* 反白字 */
    --text-gray: #666666;           /* 辅助灰 */
    
    /* 背景体系 */
    --bg-page: #ffffff;             /* 页面白底 */
    --bg-section: #f8f9fa;          /* 浅灰分区 */
    --bg-dark-glass: rgba(11, 16, 21, 0.96); /* 深色磨砂玻璃 (用于菜单/弹窗) */
    --hero-bg: radial-gradient(circle at 50% 30%, #232d38 0%, #0b1015 100%);
    
    /* 边框 */
    --border-line: #e9ecef;

    /* 字体栈 (新增) */
    --font-tech: ui-monospace, SFMono-Regular, "SF Mono", "Cascadia Code", "Consolas", "Courier New", monospace;
    --font-base: 'Segoe UI', 'Roboto', Helvetica, Arial, sans-serif;
}

body {
    font-family: var(--font-base);
    margin: 0;
    padding: 0;
    color: var(--text-main);
    background-color: var(--bg-page);
    overflow-x: hidden; /* 防止装饰元素撑开横向滚动 */
}

a { text-decoration: none; color: inherit; transition: all 0.3s ease; }
ul { list-style: none; padding: 0; margin: 0; }
button { outline: none; cursor: pointer; }

/* 增强无障碍访问：键盘焦点样式 */
button:focus-visible, a:focus-visible, input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* =========================================
   2. 🛠️ 背景装饰 (Background FX)
   ========================================= */
.bg-decorations {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0; 
    pointer-events: none;
    overflow: hidden;
}

/* 等高线 */
.deco-contour-map {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-image: 
        radial-gradient(circle at 10% 20%, transparent 0%, transparent 90%, rgba(0,0,0,0.03) 91%, transparent 92%),
        radial-gradient(ellipse at 80% 80%, transparent 0%, transparent 85%, rgba(0,0,0,0.02) 86%, transparent 87%);
    opacity: 0.6;
}

/* 3D 网格平面 */
.deco-grid-plane {
    position: absolute; bottom: -10%; left: -10%; width: 120%; height: 50%;
    background-image:
        linear-gradient(rgba(0,0,0,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.05) 1px, transparent 1px);
    background-size: 60px 60px;
    transform: perspective(1000px) rotateX(60deg);
    opacity: 0.5;
}

/* 装饰图标 */
.deco-item { position: absolute; opacity: 0.05; filter: grayscale(1); z-index: -1; }
.deco-satellite { top: 12%; right: 15%; font-size: 50px; animation: float 10s ease-in-out infinite; }
.deco-uav { top: 35%; left: -80px; font-size: 36px; animation: flyPass 40s linear infinite; }
.deco-total-station { bottom: 15%; right: 20%; font-size: 42px; }

/* 地球线框 */
.deco-earth-wireframe {
    position: absolute; bottom: 40px; left: 40px; width: 140px; height: 140px;
    border-radius: 50%;
    border: 2px solid rgba(0, 86, 179, 0.6); 
    background: radial-gradient(circle at 30% 30%, rgba(0, 86, 179, 0.1), rgba(0, 86, 179, 0.05) 60%);
    box-shadow: 0 0 25px rgba(0, 86, 179, 0.2), inset 0 0 20px rgba(0, 86, 179, 0.1);
    animation: rotateGlobe 20s linear infinite;
    z-index: 10;
}
.deco-earth-wireframe::before, .deco-earth-wireframe::after {
    content: ''; position: absolute; top: 50%; left: 50%; border: 2px solid rgba(0, 86, 179, 0.4); border-radius: 50%;
}
.deco-earth-wireframe::before { width: 90%; height: 35%; transform: translate(-50%, -50%) rotate(-35deg); }
.deco-earth-wireframe::after { width: 35%; height: 90%; transform: translate(-50%, -50%) rotate(55deg); }

/* =========================================
   3. 顶部导航 (Header)
   ========================================= */
.top-bar {
    background-color: #2c3e50;
    color: #ccc;
    padding: 8px 40px;
    text-align: right;
    font-size: 12px;
    position: relative;
    z-index: 1002;
}
.lang-selector { position: relative; display: inline-block; cursor: pointer; padding: 4px 10px; border-radius: 4px; user-select: none; }
.lang-selector:hover { background-color: rgba(255,255,255,0.1); color: #fff; }

.lang-dropdown {
    display: none; position: absolute; right: 0; top: 130%; 
    background: #fff; border: 1px solid var(--border-line);
    z-index: 1000; min-width: 140px; 
    box-shadow: 0 10px 30px rgba(0,0,0,0.15); border-radius: 6px; 
    text-align: left; padding: 5px 0;
}
.lang-dropdown.show { display: block; animation: fadeIn 0.2s; }
.lang-dropdown li { padding: 8px 20px; border-bottom: 1px solid #f5f5f5; color: var(--text-main); font-size: 13px; transition: 0.2s; }
.lang-dropdown li:hover { background-color: var(--bg-section); color: var(--primary-color); padding-left: 25px; }

.main-header {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    padding: 0 50px;
    height: 80px;
    display: flex; align-items: center; justify-content: space-between;
    position: relative; z-index: 1001;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03); border-bottom: 1px solid rgba(0,0,0,0.03);
}
.logo { font-size: 28px; font-weight: 900; color: #1a1a1a; letter-spacing: 1px; font-family: 'Arial Black', sans-serif; }
.logo span { color: var(--primary-color); }

/* PC 导航布局 */
@media screen and (min-width: 769px) {
    .nav-menu {
        position: absolute; left: 50%; transform: translateX(-50%);
        display: flex; height: 100%; align-items: center; gap: 50px;
    }
    .nav-item { position: relative; height: 100%; display: flex; align-items: center; cursor: pointer; }
    .nav-link { 
        font-size: 15px; font-weight: 700; color: #444; 
        position: relative; padding: 5px 0; text-transform: uppercase;
    }
    .nav-link::after {
        content: ''; position: absolute; width: 0; height: 3px;
        bottom: -24px; left: 50%; transform: translateX(-50%);
        background-color: var(--primary-color);
        transition: width 0.3s ease; box-shadow: 0 -2px 10px var(--primary-glow);
    }
    .nav-item:hover .nav-link { color: var(--primary-color); }
    .nav-item:hover .nav-link::after { width: 100%; }
    
    .mobile-menu-toggle { display: none; }
}

/* =========================================
   4. 🚀 科技感二级菜单 (Tech Dropdown)
   ========================================= */

/* 仅在 PC 端应用科技浮窗样式 */
@media screen and (min-width: 769px) {
    .dropdown-menu {
        display: none; 
        position: absolute; 
        top: 80px; 
        left: 50%; 
        transform: translateX(-50%);
        
        /* 核心：深色磨砂背景 */
        background: var(--bg-dark-glass);
        backdrop-filter: blur(12px);
        
        /* 边框：青色微光 + 顶部橙色高亮 */
        border: 1px solid var(--tech-cyan-dim);
        border-top: 2px solid var(--primary-color);
        
        min-width: 400px;
        padding: 0; 
        z-index: 1002;
        box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
        
        /* 机械切角效果 */
        clip-path: polygon(0 0, 100% 0, 100% calc(100% - 15px), calc(100% - 15px) 100%, 0 100%);
        border-radius: 0 0 10px 0;
        
        animation: slideDown 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    }
    
    .nav-item:hover .dropdown-menu { display: block; }

    /* 单个产品行 */
    .product-group {
        display: flex; 
        justify-content: space-between; 
        align-items: center;
        padding: 16px 25px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        position: relative;
        overflow: hidden;
    }

    /* 悬停光效：左侧橙色光标 + 背景扫光 */
    .product-group:hover {
        background: linear-gradient(90deg, rgba(243, 112, 33, 0.1) 0%, transparent 100%);
        padding-left: 35px; /* 滑动动画 */
    }
    .product-group::before {
        content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
        background: var(--primary-color);
        opacity: 0; transition: 0.3s;
        box-shadow: 0 0 10px var(--primary-color);
    }
    .product-group:hover::before { opacity: 1; }

    /* 产品名称 */
    .product-title {
        font-family: var(--font-base);
        font-weight: 700; 
        font-size: 16px; 
        color: #fff; 
        letter-spacing: 1px;
        text-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
    }

    /* 链接区域 */
    .product-links {
        font-size: 12px; 
        color: rgba(255, 255, 255, 0.4); 
        display: flex; 
        gap: 15px; /* 控制链接间距 */
    }

    .product-links a {
        color: rgba(255, 255, 255, 0.6); 
        font-weight: 500; 
        text-transform: uppercase;
        position: relative;
        transition: 0.3s;
    }

    /* 链接悬停高亮 */
    .product-links a:hover { color: var(--primary-color); text-shadow: 0 0 8px var(--primary-color); }
    /* 说明书链接特殊高亮 (青色) */
    .product-links a:hover[data-i18n*="manual"] { color: var(--tech-cyan); text-shadow: 0 0 8px var(--tech-cyan); }
}

/* 📱 移动端菜单适配 */
@media screen and (max-width: 768px) {
    .main-header { padding: 0 20px; height: 70px; }
    .mobile-menu-toggle {
        display: block; font-size: 20px; color: var(--text-main);
        padding: 8px 12px; border: 1px solid rgba(0,0,0,0.1); border-radius: 6px;
        background: rgba(255,255,255,0.5);
    }
    
    .nav-menu {
        display: none; position: absolute; top: 70px; left: 0; width: 100%;
        background: rgba(255, 255, 255, 0.98); 
        flex-direction: column; box-shadow: 0 20px 40px rgba(0,0,0,0.15); z-index: 99;
    }
    .nav-menu.active { display: flex; }
    
    .nav-item { width: 100%; text-align: left; border-bottom: 1px solid #eee; }
    .nav-link { display: block; padding: 18px 25px; color: #333; font-weight: 600; }
    
    /* 移动端下拉菜单还原为普通列表 */
    .dropdown-menu { 
        display: none; position: static; background: #f4f6f8; 
        box-shadow: inset 0 5px 10px rgba(0,0,0,0.05);
        padding: 0; border-left: 4px solid #ddd;
        /* 重置 PC 端样式 */
        clip-path: none; border: none; min-width: auto;
    }
    
    .product-group {
        display: block; padding: 12px 30px; border-bottom: 1px solid #eee;
    }
    .product-title { color: #555; font-size: 14px; display: block; margin-bottom: 5px; text-shadow: none; }
    .product-links { display: flex; gap: 10px; font-size: 13px; }
    .product-links a { color: #888; }
    .product-links a:hover { color: var(--primary-color); }
}

/* =========================================
   5. Hero Section
   ========================================= */
.hero-section {
    position: relative;
    background: var(--hero-bg);
    padding: 140px 20px 160px;
    text-align: center;
    color: var(--text-light);
    z-index: 1; 
    overflow: hidden;
}
.hero-section::after {
    content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 100px;
    background: linear-gradient(to bottom, transparent, var(--bg-page)); 
    z-index: 3; pointer-events: none;
}
#particleCanvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none; }
.hero-section h1, .hero-section p, .search-container { position: relative; z-index: 10; }

.hero-section h1 { 
    margin: 0 0 20px; font-size: 3.5em; font-weight: 800; 
    color: #fff; text-shadow: 0 5px 15px rgba(0,0,0,0.8);
    letter-spacing: 1px; 
}
.hero-section h1 span { color: var(--primary-color); position: relative; display: inline-block; }
.hero-section h1 span::after {
    content: ''; position: absolute; bottom: 5px; left: 0; width: 100%; height: 4px;
    background-color: var(--primary-color); opacity: 0.3; border-radius: 2px;
}
.hero-section p { color: rgba(255,255,255,0.9); text-shadow: 0 2px 5px rgba(0,0,0,0.5); font-size: 1.25em; margin-bottom: 50px; }

/* 搜索框 */
.search-container { display: flex; justify-content: center; align-items: center; gap: 10px; margin-top: 35px; }

.search-input {
    width: 100%; max-width: 450px; padding: 15px 30px;
    border-radius: 50px; 
    background: rgba(255, 255, 255, 0.1); 
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #ffffff; font-size: 16px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1); transition: all 0.3s ease;
}
.search-input::placeholder { color: rgba(255, 255, 255, 0.7); }
.search-input:focus {
    background: rgba(255, 255, 255, 0.15); border-color: var(--primary-color);
    box-shadow: 0 0 20px var(--primary-glow); width: 480px;
}
.search-btn {
    padding: 15px 35px; border-radius: 50px; border: none;
    background: linear-gradient(135deg, var(--primary-color) 0%, #ff9a44 100%);
    color: white; font-weight: bold; transition: all 0.3s ease;
}
.search-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px var(--primary-glow); }

/* =========================================
   6. 内容卡片 (Content Cards)
   ========================================= */
.content-container {
    display: flex; justify-content: center; flex-wrap: wrap; gap: 30px;
    padding: 60px 20px; max-width: 1200px; margin: -50px auto 0;
    position: relative; z-index: 10;
}
.card {
    background: #fff; width: 320px; padding: 40px; border-radius: 16px;
    border: 1px solid var(--border-line);
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    text-align: left; transition: 0.4s; position: relative; overflow: hidden;
}
.card:hover { transform: translateY(-10px); box-shadow: 0 20px 50px rgba(0,0,0,0.12); }
.card::after {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    transform: scaleX(0); transition: 0.4s;
}
.card:hover::after { transform: scaleX(1); }
.card h3 { color: #2c3e50; margin-top: 0; font-size: 1.5em; }
.card p { color: var(--text-gray); font-size: 14px; margin-bottom: 30px; min-height: 45px; }
.card a { color: var(--primary-color); font-weight: bold; font-size: 14px; }

/* =========================================
   7. 📂 科技感弹窗 (Sci-Fi Modals)
   ========================================= */
.modal { display: none; position: fixed; z-index: 9999; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.7); backdrop-filter: blur(5px); }

/* 弹窗通用样式：HUD 界面风格 */
#firmwareModal .modal-content, 
#manualModal .modal-content,
#searchChoiceModal .modal-content,
#contactModal .modal-content {
    background: var(--bg-dark-glass);
    border: 1px solid rgba(0, 240, 255, 0.3); /* 青色描边 */
    box-shadow: 0 0 40px rgba(0, 240, 255, 0.15), inset 0 0 20px rgba(0, 0, 0, 0.8);
    color: #fff;
    border-radius: 4px;
    margin: 8% auto; width: 90%; max-width: 500px;
    position: relative; overflow: hidden;
    animation: modalPop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    
    /* 四角装饰线条 (背景渐变模拟) */
    background-image: 
        linear-gradient(var(--tech-cyan), var(--tech-cyan)), linear-gradient(var(--tech-cyan), var(--tech-cyan)), 
        linear-gradient(var(--tech-cyan), var(--tech-cyan)), linear-gradient(var(--tech-cyan), var(--tech-cyan));
    background-repeat: no-repeat;
    background-size: 2px 20px, 20px 2px;
    background-position: left top, left top, right bottom, right bottom;
}

/* 弹窗头部：终端风格 */
.modal-header {
    background: rgba(0, 240, 255, 0.05);
    border-bottom: 1px solid rgba(0, 240, 255, 0.2);
    padding: 15px 25px;
    display: flex; justify-content: space-between; align-items: center;
}
.modal-header h3 {
    margin: 0; color: var(--tech-cyan);
    
    /* 🚀 字体优化：终端等宽字体 */
    font-family: var(--font-tech);
    
    text-transform: uppercase;
    letter-spacing: 1.5px; 
    font-size: 18px;
    font-weight: 700;
    text-shadow: 0 0 5px rgba(0, 240, 255, 0.4);
}
.modal-header h3::before { content: '>_ '; color: var(--primary-color); }

.close-btn { color: rgba(255,255,255,0.5); font-size: 28px; cursor: pointer; transition: 0.3s; }
.close-btn:hover { color: #ff3333; text-shadow: 0 0 10px #ff0000; transform: rotate(90deg); }

/* 列表容器 */
.modal-body { padding: 25px; max-height: 500px; overflow-y: auto; }

/* 列表项：数据行 */
.firmware-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 12px 15px; margin-bottom: 8px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-left: 2px solid transparent;
    transition: 0.2s;
}
.firmware-item:hover {
    background: rgba(0, 240, 255, 0.05);
    border-color: rgba(0, 240, 255, 0.3);
    border-left-color: var(--tech-cyan);
    transform: translateX(5px);
}

/* 版本号：等宽代码字体 */
.fw-version { 
    color: #fff; 
    font-family: var(--font-tech); 
    font-size: 15px; 
    font-weight: 600;
}

/* 日期：普通无衬线字体，形成对比 */
.fw-date { 
    color: rgba(255, 255, 255, 0.5); 
    font-family: var(--font-base);
    font-size: 12px; margin-left: 10px; 
}
.firmware-item:hover .fw-date { color: var(--tech-cyan); }

/* 下载按钮：发光实心块 */
.fw-download-btn {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 5px 15px; border-radius: 2px;
    text-transform: uppercase; font-size: 11px; letter-spacing: 1px;
    transition: 0.3s;
    font-family: var(--font-base);
    font-weight: 700;
}
.fw-download-btn:hover {
    background: var(--primary-color); color: #000;
    box-shadow: 0 0 15px var(--primary-glow);
}

/* 滚动条美化 (Webkit) */
.modal-body::-webkit-scrollbar { width: 6px; }
.modal-body::-webkit-scrollbar-track { background: #0b1015; }
.modal-body::-webkit-scrollbar-thumb { background: #333; border-radius: 3px; }
.modal-body::-webkit-scrollbar-thumb:hover { background: var(--primary-color); }

/* --- Search Choice Modal 特殊调整 --- */
#searchResultBtns .search-btn {
    width: 100%; padding: 16px; margin-bottom: 10px;
    background: rgba(0,0,0,0.3); border: 1px solid var(--border-line);
    color: #ccc;
}
#searchResultBtns button:nth-child(1) { border-color: var(--tech-cyan); color: var(--tech-cyan); }
#searchResultBtns button:nth-child(1):hover { background: var(--tech-cyan); color: #000; box-shadow: 0 0 20px var(--tech-cyan-dim); }
#searchResultBtns button:nth-child(2) { border-color: var(--primary-color); color: var(--primary-color); }
#searchResultBtns button:nth-child(2):hover { background: var(--primary-color); color: #000; box-shadow: 0 0 20px var(--primary-glow); }

/* --- Contact Modal 特殊调整 --- */
#contactModal .modal-content { max-width: 700px; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); margin: 0; }
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.contact-card {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 30px 20px;
    background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(255, 255, 255, 0.08); border-radius: 8px;
    color: #ccc; transition: all 0.4s;
}
.contact-card:hover { transform: translateY(-5px); background: rgba(255, 255, 255, 0.06); }
.contact-card .icon { font-size: 32px; margin-bottom: 15px; }
.contact-card.telegram:hover { border-color: #229ED9; color: #229ED9; box-shadow: 0 0 20px rgba(34, 158, 217, 0.2); }
.contact-card.whatsapp:hover { border-color: #25D366; color: #25D366; box-shadow: 0 0 20px rgba(37, 211, 102, 0.2); }
.contact-card.email:hover { border-color: var(--primary-color); color: var(--primary-color); box-shadow: 0 0 20px var(--primary-glow); }

/* =========================================
   8. 页脚 & 动画
   ========================================= */
.site-footer {
    text-align: center; padding: 40px 20px;
    background: #2c3e50; color: #ccc; margin-top: 80px;
}
.site-footer a:hover { color: var(--primary-color); }

@keyframes modalPop { 0% { opacity: 0; transform: scale(0.95); } 100% { opacity: 1; transform: scale(1); } }
@keyframes slideDown { 0% { opacity: 0; transform: translate(-50%, -10px); } 100% { opacity: 1; transform: translate(-50%, 0); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: translateY(0); } }
@keyframes rotateGlobe { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes float { 0%, 100% { transform: translateY(0) rotate(10deg); } 50% { transform: translateY(-20px) rotate(5deg); } }
@keyframes flyPass { 0% { left: -10%; transform: translateY(0); } 100% { left: 110%; transform: translateY(-40px); } }