/* ========================================= */
/* --- 1. 全局变量与基础重置 --- */
/* ========================================= */
:root {
    --bg-dark: #050505;           
    --bg-alt: #0a0a0a;            
    --bg-card: rgba(20,20,20,0.6);
    --accent: #00e5ff;            
    --text-main: #ffffff;         
    --text-mut: #aaaaaa;          
    --border: #1a1a1a;            
    --border-light: rgba(255,255,255,0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif; }
body { background: var(--bg-dark); color: var(--text-main); overflow-x: hidden; scroll-behavior: smooth; line-height: 1.6; }

/* ========================================= */
/* --- 2. 布局工具类 --- */
/* ========================================= */
.section { padding: 130px 0; border-top: 1px solid var(--border); }
.alt-bg { background: var(--bg-alt); }
.container { width: 90%; max-width: 1280px; margin: 0 auto; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 35px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; }
.align-center { align-items: center; }

/* 强制居中钢印 */
.text-center { text-align: center !important; }

/* ========================================= */
/* --- 3. 字体排版系统 --- */
/* ========================================= */
.section-header { margin-bottom: 60px; }
.section-header.text-center { display: flex; flex-direction: column; align-items: center; justify-content: center; }

.top-tag { color: var(--accent); font-size: 0.85rem; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; display: block; margin-bottom: 15px; }
h1 { font-size: 3.6rem; line-height: 1.25; margin-bottom: 25px; font-weight: 800; letter-spacing: -1px; text-shadow: 0 0 40px rgba(0,229,255,0.15); }
h2 { font-size: 2.6rem; margin-bottom: 30px; font-weight: 700; line-height: 1.4; }
h3 { font-size: 1.45rem; margin-bottom: 15px; font-weight: 600; color: #fff; }
h4 { font-size: 1.3rem; margin-bottom: 12px; font-weight: 600; color: #fff; }
h5 { font-size: 1.05rem; font-weight: 600; color: var(--text-main); margin-top: 15px; }
p { font-size: 1.05rem; color: var(--text-mut); line-height: 1.75; }

.subtitle { font-size: 1.15rem; max-width: 800px; line-height: 1.9; color: var(--text-mut); }
.section-header .subtitle { margin-top: 25px; }
.section-header.text-center .subtitle { margin-left: auto !important; margin-right: auto !important; text-align: center !important; }

/* ========================================= */
/* --- 4. 按钮系统 --- */
/* ========================================= */
.btn-group { display: flex; gap: 15px; flex-wrap: wrap; }
.btn { padding: 15px 35px; border-radius: 4px; font-weight: 600; font-size: 1.05rem; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); cursor: pointer; }
.btn-primary { background: var(--accent); color: #000; box-shadow: 0 0 15px rgba(0,229,255,0.2); }
.btn-primary:hover { background: #00c4db; box-shadow: 0 0 25px rgba(0,229,255,0.5); transform: translateY(-3px); }
.btn-outline { border: 1px solid #444; color: #fff; background: rgba(255,255,255,0.02); backdrop-filter: blur(5px); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-3px); background: rgba(0,229,255,0.05); }
.btn-text { color: var(--accent); text-decoration: none; font-weight: 600; font-size: 1.05rem; transition: color 0.3s; display: inline-flex; align-items: center; border-bottom: 1px solid transparent; padding-bottom: 2px; }
.btn-text:hover { color: #fff; border-bottom-color: #fff; }

/* ========================================= */
/* --- 5. 通用高级卡片 --- */
/* ========================================= */
.card { background: var(--bg-card); border: 1px solid var(--border-light); padding: 40px 35px; border-radius: 12px; transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); backdrop-filter: blur(10px); display: flex; flex-direction: column; }
.card:hover { transform: translateY(-8px); border-color: rgba(0,229,255,0.4); background: rgba(25,25,25,0.8); box-shadow: 0 20px 40px rgba(0,0,0,0.6), 0 0 20px rgba(0,229,255,0.1); }
.card-icon { width: 38px; height: 38px; stroke: var(--accent); margin-bottom: 25px; filter: drop-shadow(0 0 6px rgba(0,229,255,0.5)); transition: transform 0.3s; }
.card:hover .card-icon { transform: scale(1.1); }

/* ========================================= */
/* --- 6. 导航栏 & 多语言菜单 --- */
/* ========================================= */
.navbar { position: fixed; width: 100%; top: 0; display: flex; justify-content: space-between; align-items: center; padding: 20px 5%; background: rgba(5,5,5,0.85); backdrop-filter: blur(12px); z-index: 1000; border-bottom: 1px solid var(--border-light); }
.logo { font-size: 21px; font-weight: 800; letter-spacing: 1px; color: var(--accent); text-decoration: none; }
.nav-links { display: flex; align-items: center; }
.nav-links a { color: #ccc; text-decoration: none; margin: 0 15px; font-size: 14px; font-weight: 600; transition: color 0.3s; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.highlight-link { color: #a67c00 !important; border: 1px solid rgba(166,124,0,0.5); padding: 5px 12px; border-radius: 4px; transition: all 0.3s; margin-left: 10px !important; }
.highlight-link:hover { background: rgba(166,124,0,0.15); color: #ffd700 !important; border-color: #ffd700; }

.lang-dropdown { position: relative; display: inline-block; margin-left: 10px; }
.lang-btn { cursor: default; }
.lang-menu { position: absolute; right: 0; top: 150%; background-color: #111; min-width: 140px; box-shadow: 0px 10px 30px rgba(0,0,0,0.9); border: 1px solid #333; border-radius: 8px; z-index: 1001; padding: 10px 0; opacity: 0; visibility: hidden; transform: translateY(15px); transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); }
.lang-dropdown:hover .lang-menu { opacity: 1; visibility: visible; transform: translateY(0); top: 100%; }
.lang-menu a { color: #aaa !important; padding: 12px 25px !important; text-decoration: none; display: block !important; font-size: 0.95rem !important; margin: 0 !important; font-weight: 500 !important; border-bottom: 1px solid #1a1a1a; text-align: left; transition: all 0.3s ease; }
.lang-menu a:last-child { border-bottom: none; }
.lang-menu a:hover { background-color: rgba(0, 229, 255, 0.08); color: #00e5ff !important; padding-left: 32px !important; }

/* ========================================= */
/* --- 7. 首屏 (Hero) --- */
/* ========================================= */
.hero { height: 100vh; min-height: 800px; display: flex; align-items: center; background: url('images/bg-hero.jpg') center/cover no-repeat; position: relative; border: none; padding: 0; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(0,0,0,0.95) 0%, rgba(0,0,0,0.6) 55%, rgba(0,0,0,0.1) 100%); }
.hero-content { position: relative; z-index: 10; display: flex; justify-content: space-between; align-items: center; padding-top: 60px; }
.hero-text { width: 55%; }
.hero-image { width: 45%; display: flex; justify-content: flex-end; padding-right: 2vw; }
.hero-image img { width: 100%; max-width: 520px; height: auto; }
.tags-group { display: flex; gap: 10px; margin-bottom: 30px; flex-wrap: wrap; }
.tag { border: 1px solid rgba(0,229,255,0.3); color: var(--accent); padding: 5px 14px; border-radius: 20px; font-size: 0.85rem; font-weight: 600; background: rgba(0,229,255,0.05); backdrop-filter: blur(5px); }

/* ========================================= */
/* --- 8. 状态小标签 (Status Badges) --- */
/* ========================================= */
.status { display: inline-block; padding: 5px 12px; font-size: 0.8rem; border-radius: 4px; margin-bottom: 18px; font-weight: 600; align-self: flex-start; }
.status.mature { color: #00e676; background: rgba(0,230,118,0.1); border: 1px solid rgba(0,230,118,0.2); }
.status.opt { color: #ffb300; background: rgba(255,179,0,0.1); border: 1px solid rgba(255,179,0,0.2); }
.status.dev { color: #448aff; background: rgba(68,138,255,0.1); border: 1px solid rgba(68,138,255,0.2); }
.status.custom { color: #e040fb; background: rgba(224,64,251,0.1); border: 1px solid rgba(224,64,251,0.2); }

/* ========================================= */
/* --- 9. 数据背书验证区 --- */
/* ========================================= */
.val-data { width: 40%; display: flex; flex-direction: column; gap: 40px; }
.data-item { display: flex; flex-direction: column; border-left: 3px solid #333; padding-left: 25px; transition: border-color 0.3s; }
.data-item:hover { border-left-color: var(--accent); }
.data-item.highlight-data { border-left-color: var(--accent); }
.data-number { font-size: 4rem; font-weight: 900; color: #fff; line-height: 1; margin-bottom: 5px; font-variant-numeric: tabular-nums; }
.counter { color: var(--accent); text-shadow: 0 0 20px rgba(0,229,255,0.3); }
.plus { font-size: 2.2rem; color: var(--accent); margin-left: 2px; }
.data-text { color: #00e5ff; font-weight: 600; font-size: 1.15rem; letter-spacing: 1px; }
.val-text { width: 55%; }

/* ========================================= */
/* --- 10. 各类展示与联系路由卡片 --- */
/* ========================================= */
.tech-card { padding: 35px 25px; background: rgba(255,255,255,0.01); border-top: 2px solid #222; transition: 0.3s; display: flex; flex-direction: column; }
.tech-card:hover { border-top-color: var(--accent); background: rgba(0,229,255,0.02); }

.partner-card { background: linear-gradient(180deg, #111 0%, #0a0a0a 100%); border: 1px solid #1a1a1a; display: flex; flex-direction: column; padding: 45px 35px; border-radius: 12px; transition: all 0.3s; }
.partner-card:hover { border-color: rgba(0,229,255,0.4); transform: translateY(-8px); box-shadow: 0 15px 30px rgba(0,0,0,0.5); }
.partner-card h3 { font-size: 1.35rem; border-bottom: 1px solid #222; padding-bottom: 18px; margin-bottom: 18px; color: #fff; }

.routing-card { text-align: center; border: 1px solid #222; background: rgba(20,20,20,0.4); padding: 45px 35px; border-radius: 10px; transition: all 0.3s; }
.routing-card h4 { color: #fff; margin-bottom: 12px; font-size: 1.2rem; }
.routing-card p { font-size: 0.95rem; color: #888; }
.routing-card:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: 0 10px 30px rgba(0,229,255,0.08); background: linear-gradient(180deg, #111 0%, #081216 100%); }

/* 关于森沙关键词 & 打钩列表 & 占位图 */
.about-snippet-section { background: #080808; }
.about-snippet-section .keyword-row { display: flex; justify-content: center; gap: 25px; flex-wrap: wrap; margin: 45px 0; }
.about-snippet-section .kw { color: var(--accent); font-weight: 600; font-size: 1.1rem; border: 1px solid rgba(0,229,255,0.3); padding: 5px 15px; border-radius: 4px; }
.about-desc { font-size: 1.15rem; color: #ccc; max-width: 800px; margin: 0 auto; line-height: 2.0; text-align: justify; text-align-last: center; }

.bullet-list { list-style: none; margin-bottom: 40px; text-align: left; }
.bullet-list li { margin-bottom: 12px; color: #ccc; padding-left: 28px; position: relative; font-size: 1.05rem; }
.bullet-list li::before { content: '✔'; color: var(--accent); position: absolute; left: 0; font-size: 1.1rem; }
.bullet-list li strong { color: #fff; }

.app-img-placeholder { width: 100%; height: 500px; background: radial-gradient(circle, #1a1a1a, #0a0a0a); border-radius: 12px; border: 1px solid #222; display: flex; align-items: center; justify-content: center; color: #555; box-shadow: 0 20px 50px rgba(0,0,0,0.5); font-size: 1.1rem; letter-spacing: 1px; }

/* 底部 Footer */
.footer { background: #020202; padding: 40px 0 30px; border-top: 1px solid #111; text-align: center; }
.footer a { color: #444; text-decoration: none; transition: 0.3s; }
.footer a:hover { color: var(--accent); }


/* ======================================================== */
/* 🎯 终极核武器：全息蓝图雷达探测特效 (Interactive Blueprint) */
/* ======================================================== */

.exploded-blueprint-container {
    position: relative;
    width: 100%;
    max-width: 850px;
    margin: 0 auto;
    padding: 60px 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.blueprint-img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 30px 60px rgba(0,0,0,0.9));
    animation: floatSlow 8s ease-in-out infinite; 
}

.hotspot {
    position: absolute;
    width: 40px;
    height: 40px;
    cursor: crosshair; 
    z-index: 20;
    transform: translate(-50%, -50%);
}

.radar-dot {
    width: 16px;
    height: 16px;
    background-color: var(--accent);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 15px var(--accent);
}

.radar-dot::after {
    content: '';
    position: absolute;
    top: -12px; left: -12px; right: -12px; bottom: -12px;
    border: 2px solid var(--accent);
    border-radius: 50%;
    animation: pulseRadar 2.5s infinite cubic-bezier(0.25, 0.8, 0.25, 1);
}
@keyframes pulseRadar {
    0% { transform: scale(0.5); opacity: 1; border-width: 3px; }
    100% { transform: scale(2.8); opacity: 0; border-width: 1px; }
}

.hotspot-tooltip {
    position: absolute;
    bottom: 150%; 
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    width: 320px;
    background: rgba(10, 10, 10, 0.85);
    border: 1px solid rgba(0, 229, 255, 0.3);
    padding: 25px 25px 20px 25px;
    border-radius: 8px;
    backdrop-filter: blur(15px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.9), 0 0 30px rgba(0, 229, 255, 0.1);
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); 
    pointer-events: none;
    z-index: 30;
    text-align: left;
}

.hotspot-tooltip::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-width: 8px 8px 0;
    border-style: solid;
    border-color: rgba(0, 229, 255, 0.3) transparent transparent transparent;
}

.hotspot:hover .hotspot-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.hotspot-tooltip h4 {
    color: var(--accent);
    font-size: 1.15rem;
    margin-bottom: 12px;
    font-weight: 700;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 10px;
}
.hotspot-tooltip p {
    color: #ccc;
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 0;
}


/* ========================================= */
/* --- 11. 全局动画类 --- */
/* ========================================= */
.float-anim { filter: drop-shadow(0 20px 40px rgba(0,0,0,0.9)); animation: float 6s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }
.floating-device-slow { filter: drop-shadow(0 30px 40px rgba(0,0,0,0.9)); animation: floatSlow 8s ease-in-out infinite; }
@keyframes floatSlow { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-15px); } }
.fade-up { opacity: 0; transform: translateY(30px); animation: fadeUp 0.8s forwards cubic-bezier(0.2, 0.8, 0.2, 1); }
.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }

/* ========================================= */
/* --- 12. 移动端响应式 (Mobile Responsive) --- */
/* ========================================= */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: 1fr 1fr; }
    h1 { font-size: 3rem; }
}

@media (max-width: 900px) {
    .section { padding: 70px 0; }
    h1 { font-size: 2.6rem !important; }
    h2 { font-size: 2.2rem; }
    
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 30px; }
    .hero { height: auto; min-height: auto; padding: 130px 0 60px; }
    
    .hero-content, .align-center { flex-direction: column; text-align: center; }
    .hero-text, .hero-image, .text-block, .image-block, .val-data { width: 100%; margin-bottom: 40px; }
    .hero-image { justify-content: center; padding-right: 0; } 
    
    .tags-group, .btn-group, .keyword-row { justify-content: center !important; }
    .subtitle { margin-left: auto !important; margin-right: auto !important; text-align: center !important; }
    .text-block { text-align: center !important; padding-left: 0 !important; }
    .text-block h2, .text-block p, .text-block .top-tag { text-align: center !important; }
    .bullet-list { text-align: left; display: inline-block; margin: 0 auto; }
    
    .val-data { flex-direction: row; flex-wrap: wrap; justify-content: space-around; gap: 20px; }
    .data-item { border-left: none; border-top: 3px solid var(--accent); padding-left: 0; padding-top: 15px; text-align: center; }
    .data-number { font-size: 2.8rem; }
    
    .hero-image img { max-width: 320px; }
    .app-img-placeholder { height: 300px; }
    
    /* 手机端屏蔽雷达图弹出面板以防错位 */
    .hotspot-tooltip { display: none !important; }

    .nav-links a:not(.lang-btn) { display: none; }
}
@media (max-width: 600px) {
    .val-data { flex-direction: column; align-items: center; }
    .data-item { border-top: none; border-left: 3px solid var(--accent); padding-top: 0; padding-left: 20px; text-align: left; }
}

/* ========================================= */
/* --- 终极排版补丁 4：修复国际经验区排版与图标 --- */
/* ========================================= */

/* 1. 强制给文字上紧箍咒，恢复左右完美排版 */
.exp-layout .text-block { 
    width: 40% !important; 
}

/* 2. 点亮隐形的图标，换成极具科技感的荧光蓝 */
.mini-card .icon { 
    stroke: #00e5ff !important; 
    width: 45px !important; 
    height: 45px !important; 
    margin-bottom: 15px !important;
}

/* 3. 保证手机端依然能自动变回上下堆叠 */
@media (max-width: 1000px) {
    .exp-layout .text-block { width: 100% !important; }
}

/* ========================================= */
/* --- 终极排版补丁 5：优化中文卡片两端对齐 --- */
/* ========================================= */

.card p, 
.text-block p {
    text-align: justify !important; /* 强制两端对齐，让文字块像报纸一样整齐方正 */
    text-justify: inter-ideograph;  /* 专门针对中文字符优化的对齐算法 */
    word-break: normal !important;  /* 取消强制断词，保护词语的完整性 */
}

/* ========================================= */
/* --- 修复表单错位补丁 --- */
/* ========================================= */

/* 1. 表单容器：使用 Flex 布局并允许换行 */
form {
    display: flex;
    flex-wrap: wrap;
    gap: 20px; /* 控制输入框之间的间距 */
    align-items: flex-start;
}

/* 2. 让左侧的输入框和下拉框占 48% 宽度（留出间隙） */
form input[type="text"],
form input[type="email"],
form input[type="tel"],
form select {
    flex: 1 1 48%; /* 核心：基础宽度 48%，允许伸缩 */
    min-width: 280px; /* 保证在窄屏下不至于缩得太小 */
    padding: 12px 15px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-light);
    color: #fff;
    border-radius: 4px;
    outline: none;
    transition: border-color 0.3s;
}

/* 3. 让右侧的留言框占 48% 宽度，并设置高度 */
form textarea {
    flex: 1 1 48%;
    min-width: 280px;
    height: 128px; /* 根据你的截图大概是 3 个输入框的高度和 */
    padding: 12px 15px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-light);
    color: #fff;
    border-radius: 4px;
    outline: none;
    resize: none; /* 禁止用户手动拉伸破坏布局 */
}

/* 4. 按钮强制占满一行 */
form .btn-primary {
    flex: 1 1 100%;
    margin-top: 10px;
}

/* 5. 焦点状态高亮（与你的 accent 颜色一致） */
form input:focus, 
form textarea:focus, 
form select:focus {
    border-color: var(--accent);
    background: rgba(0, 229, 255, 0.05);
}

/* 6. 移动端适配：全部变回一列 */
@media (max-width: 768px) {
    form input, form textarea, form select {
        flex: 1 1 100%;
    }
}

/* --- 修复下拉菜单选项看不见的问题 --- */

/* 1. 强制下拉列表容器的背景为深色，文字为白色 */
form select option {
    background-color: #1a1a1a !important; /* 使用你变量里的深灰色 */
    color: #ffffff !important;           /* 强制文字为白色 */
    padding: 10px;
}

/* 2. 针对某些浏览器的兼容性处理 */
form select {
    appearance: none;    /* 去掉浏览器默认样式 */
    -webkit-appearance: none;
    -moz-appearance: none;
    /* 添加一个小箭头图标，防止 appearance:none 后看不到下拉箭头 */
    background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    padding-right: 40px; /* 给箭头留出空间 */
}

/* ================================================================== */
/* 📱 移动端终极抢救补丁 (Mobile Fix) - 请保留在 style.css 的最底部！ */
/* ================================================================== */

@media screen and (max-width: 850px) {
    /* 1. 修复所有左右分栏被挤压 (强制 100% 宽度，上下舒适排列) */
    div[style*="width: 55%"], 
    div[style*="width: 40%"], 
    div[style*="width: 50%"],
    div[style*="width: 31%"],
    div[style*="width: 46%"] {
        width: 100% !important;
        margin-bottom: 30px !important;
    }

    /* 强制所有 Flex 和 Grid 左右布局变成上下单列堆叠 */
    div[style*="display: flex"][style*="justify-content: space-between"] {
        flex-direction: column !important;
    }
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr !important;
        display: flex !important;
        flex-direction: column !important;
        gap: 20px !important;
    }

    /* 2. 修复巨型大标题撑爆手机屏幕 */
    h1, h2 {
        word-wrap: break-word !important;
        white-space: normal !important;
    }
    h1[style*="font-size: 3.5rem"], 
    h1[style*="font-size: 3.2rem"],
    h1[style*="font-size: 3.6rem"] {
        font-size: 2.2rem !important;
        line-height: 1.3 !important;
        margin-top: 20px !important;
    }

    /* 3. 修复首屏高度 800px 导致的大面积恐怖留白 */
    .hero[style*="min-height: 800px"], 
    .hero[style*="min-height: 60vh"] {
        min-height: auto !important;
        padding: 120px 20px 80px 20px !important;
    }

    /* 4. 修复 Contact 页面 VIP 卡片的负边距错位 (margin-top: -100px) */
    div[style*="margin-top: -100px"] {
        margin-top: 0 !important;
        padding: 30px 20px !important;
        flex-direction: column !important;
        gap: 20px !important;
    }

    /* 5. 手机端“汉堡包”菜单按钮样式（唤出导航栏） */
    .mobile-menu-btn {
        display: block !important;
        font-size: 2rem;
        color: #00e5ff;
        cursor: pointer;
        position: absolute;
        right: 20px;
        top: 15px;
        z-index: 1000;
    }
    .nav-links {
        display: none; /* 手机端默认隐藏 */
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: rgba(10, 10, 10, 0.98);
        flex-direction: column;
        padding: 20px 0;
        box-shadow: 0 10px 30px rgba(0,0,0,0.8);
        z-index: 999;
    }
    .nav-links.show-mobile-menu {
        display: flex !important; /* 点击按钮后强制显示 */
    }
    .nav-links a {
        margin: 15px 30px !important;
        font-size: 1.2rem;
        display: block;
    }
    .lang-dropdown {
        margin: 15px 30px !important;
    }
    .lang-menu {
        position: relative;
        display: none;
        background: transparent;
        box-shadow: none;
        padding-left: 15px;
    }
    /* 手机端点击语言栏自动展开多语言菜单 */
    .lang-dropdown:active .lang-menu,
    .lang-dropdown:focus .lang-menu,
    .lang-dropdown:hover .lang-menu {
        display: flex;
        flex-direction: column;
    }
}

/* 电脑端自动隐藏汉堡包按钮 */
@media screen and (min-width: 851px) {
    .mobile-menu-btn {
        display: none !important;
    }
}