/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    min-width: 320px; /* 最小宽度，确保在小屏幕上可用 */
}

/* CSS变量 - 基于自然摄影网站的设计风格 */
:root {
    /* 颜色变量 - 新配色方案 */
    --primary-color: #403f2b;        /* 深橄榄绿 - 主色 */
    --secondary-color: #43422e;      /* 深橄榄绿变体 - 次要色 */
    --accent-color: #f3f1c4;         /* 浅黄绿 - 强调色 */
    --text-primary: #403f2b;         /* 深橄榄绿 - 主要文字 */
    --text-secondary: #43422e;       /* 深橄榄绿变体 - 次要文字 */
    --text-light: #fefaf0;           /* 米白色 - 浅色文字 */
    --text-muted: #c4c1b4;           /* 灰褐色 - 弱化文字 */
    --background-light: #fefaf0;     /* 米白色 - 浅色背景 */
    --background-dark: #403f2b;      /* 深橄榄绿 - 深色背景 */
    --background-overlay: rgba(64, 63, 43, 0.8);  /* 深橄榄绿半透明 */
    --background-accent: #f5f3cd;    /* 浅黄色 - 强调背景 */
    --background-neutral: #f7f7f5;   /* 浅灰白 - 中性背景 */
    --border-color: #c4c1b4;         /* 灰褐色 - 边框 */
    --shadow-light: rgba(64, 63, 43, 0.1);   /* 浅阴影 */
    --shadow-medium: rgba(64, 63, 43, 0.2);  /* 中等阴影 */

    /* 字体变量 */
    --font-primary: 'Playfair Display', serif;
    --font-secondary: 'Inter', sans-serif;

    /* 尺寸变量 */
    --container-max-width: 1200px;
    --container-max-width-large: 1400px; /* 大屏幕最大宽度 */
    --section-padding: 100px 0;
    --border-radius: 12px;
    --transition: all 0.4s ease;
    --header-height: 80px;
}

/* 基础样式 */
body {
    font-family: var(--font-secondary);
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--background-light);
    overflow-x: hidden;
    min-width: 320px; /* 最小宽度 */
    max-width: 100vw; /* 最大宽度不超过视口 */
}

/* 主页面容器 - 限制整体最大宽度 */
.page-wrapper {
    max-width: 1600px; /* 页面最大宽度 */
    margin: 0 auto;
    background-color: var(--background-light);
    box-shadow: 0 0 50px var(--shadow-light);
    position: relative;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 30px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 16px 32px;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 16px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--primary-color);
    border-color: var(--accent-color);
    box-shadow: 0 4px 15px rgba(243, 241, 196, 0.3);
}

.btn-primary:hover {
    background-color: var(--primary-color);
    color: var(--accent-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(243, 241, 196, 0.4);
}

/* 网站头部 */
/* 2025-09-25 13:10:00 +08:00 修改：导航栏背景颜色；修改人：AI助手；目标：将导航栏背景改为深棕色#403F2B；思路：替换背景色并调整透明度 */
.site-header {
    background-color: rgba(64, 63, 43, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px var(--shadow-light);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
}

.navbar {
    padding: 0;
    height: 100%;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 0px; /* 增加左右内边距，让brand和按钮向两侧移动 */
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-brand .logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--primary-color);
}

.logo-image {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.logo-icon {
    font-size: 28px;
}

/* 2025-09-25 13:10:00 +08:00 修改：logo文字颜色；修改人：AI助手；目标：在深色背景下使用浅色文字；思路：改为浅色文字确保可读性 */
.logo-text {
    font-family: var(--font-primary);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 1px;
    line-height: 1.2;
    white-space: nowrap;
    color: var(--text-light);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    margin: 0;
    padding: 0;
}

/* 2025-09-25 13:10:00 +08:00 修改：导航菜单文字颜色；修改人：AI助手；目标：在深色背景下使用浅色文字；思路：改为浅色文字确保可读性 */
.nav-menu a {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    font-size: 15px;
    letter-spacing: 0.5px;
    transition: var(--transition);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-menu a:hover {
    color: var(--accent-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    transition: var(--transition);
    border-radius: 2px;
}

/* 语言切换按钮 */
.language-switcher {
    display: flex;
    align-items: center;
}

/* 2025-09-25 13:10:00 +08:00 修改：语言切换按钮样式；修改人：AI助手；目标：在深色背景下使用浅色边框和文字；思路：改为浅色样式确保可读性 */
.lang-btn {
    background: transparent;
    border: 2px solid var(--text-light);
    color: var(--text-light);
    padding: 8px 16px;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
    min-width: 80px;
}

/* 2025-09-25 13:10:00 +08:00 修改：语言切换按钮悬停效果；修改人：AI助手；目标：在深色背景下使用协调的悬停效果；思路：使用浅色背景和深色文字 */
.lang-btn:hover {
    background: var(--text-light);
    color: var(--background-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-light);
}

/* 主要内容区域 */
main {
    margin-top: var(--header-height);
}

/* Hero Section */
.hero-section {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* 2025-08-31 修改: 背景改为视频，保留原背景图为注释
       原: background: url('../assets/heading.png') center/cover no-repeat;
       原: background-attachment: fixed; */
}

/* 2025-08-31 新增: 背景视频样式。铺满容器并置于最底层(z-index:0) */
.hero-video {
    position: absolute;
    /* 2025-08-31 强化调整: 轻放大+整体上移，目标：明显多展示下部内容。保留原值注释。 */
    top: -8%; /* 原: 0 */
    left: 0;
    width: 100%;
    height: 115%; /* 原: 100% */
    /* 2025-08-31 撤销: 恢复 cover 填充，目标：回到沉浸式铺满效果。
       之前尝试: contain + background-color(#000) 为避免裁切，现保留为注释记录。 */
    /* 曾用: object-fit: contain; */
    /* 曾用: background-color: #000; */
    object-fit: cover; /* 恢复为铺满，可能裁切边缘 */
    /* 2025-08-31 调整: 下移取景中心，减少上部留白，更多展示下部内容。
       思路: 通过 object-position 调整取景百分比，不裁切素材，不改导航高度。 */
    /* 2025-08-31 再次调整: 进一步上移取景，更多展示下部内容。原为 50% 45% */
    /* 2025-08-31 微调: 轻度上移取景，幅度小于上次。保留原值供回退。
       原: object-position: 50% 40%; */
    /* 2025-08-31 再次微调: 继续上移取景，从 30% → 25%，以更多展示下部内容。
       历史值: 45% → 40% → 38% → 35% → 30% → 25% */
    object-position: 50% 25%;
    z-index: 0;
}

/* 2025-08-31 调整: 叠层顺序。遮罩在视频之上，文字在最上 */
.hero-overlay { z-index: 1; }
/* .hero-content 已在样式中设置 z-index: 2 */

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 80%, rgba(230, 126, 34, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(52, 73, 94, 0.1) 0%, transparent 50%);
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 滚动加载动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* 延迟动画 */
.fade-in.delay-1 { transition-delay: 0.1s; }
.fade-in.delay-2 { transition-delay: 0.2s; }
.fade-in.delay-3 { transition-delay: 0.3s; }
.fade-in.delay-4 { transition-delay: 0.4s; }
.fade-in.delay-5 { transition-delay: 0.5s; }

.slide-in-left.delay-1 { transition-delay: 0.1s; }
.slide-in-left.delay-2 { transition-delay: 0.2s; }
.slide-in-left.delay-3 { transition-delay: 0.3s; }

.slide-in-right.delay-1 { transition-delay: 0.1s; }
.slide-in-right.delay-2 { transition-delay: 0.2s; }
.slide-in-right.delay-3 { transition-delay: 0.3s; }

.scale-in.delay-1 { transition-delay: 0.1s; }
.scale-in.delay-2 { transition-delay: 0.2s; }
.scale-in.delay-3 { transition-delay: 0.3s; }

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* 2025-08-31 修改: 移除首页视频半透明蒙层，使视频更清晰。保留原背景为注释。
       原: background: var(--background-overlay); */
    background: transparent;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: var(--text-light);
    max-width: 800px;
    padding: 0 20px;
}

/* 2025-08-31 增强可读性：加深阴影+轻描边（原样式保留为注释）
   原 .hero-title text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
   原 .hero-subtitle 无描边，仅轻阴影 */
.hero-title {
    font-family: var(--font-primary);
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    letter-spacing: -1px;
    /* 2025-09-01 18:05 +08:00 修改：识别文案中的换行符并渲染为换行；目标：英文主标题分两行（Timeless Wisdom, / Limitless Possibilities）；思路：white-space: pre-line 仅影响换行处理 */
    white-space: pre-line;

    /* 原阴影: 2px 2px 4px rgba(0, 0, 0, 0.3) */
    text-shadow: 0 3px 8px rgba(0,0,0,.55), 0 0 14px rgba(0,0,0,.35);
    -webkit-text-stroke: 1px rgba(0,0,0,.35); /* 轻微描边，提升边缘清晰度 */
}

.hero-subtitle {
    font-size: 1.4rem;
    margin-bottom: 3rem;
    opacity: 0.9;
    font-weight: 300;
    text-shadow: 0 2px 6px rgba(0,0,0,.5), 0 0 10px rgba(0,0,0,.3); /* 增强阴影 */
    letter-spacing: 0.5px;
}


/* 2025-09-01 17:52 +08:00 修改（桌面端专用）
   目标：
   1) 英文主标题中 “Limitless Possibilities” 两词保持同一行（配合文案 NBSP）
   2) 英文副标题在桌面端整句一行显示
   思路：
   - 不修改原基础样式；通过媒体查询在 ≥1024px 时覆盖局部规则
   - 放宽 .hero-content 的可用宽度，避免被 800px 挤压导致换行
   - 为 .hero-subtitle 添加 white-space: nowrap 以禁止桌面端换行；移动端保持自适应换行
*/
@media (min-width: 1024px) {
  .hero-content {
    /* 保留原 max-width: 800px，不直接改动；仅在桌面端放宽以容纳更长英文 */
    max-width: 95vw; /* 2025-09-01: 放宽容器宽度，减少换行概率 */
  }
  .hero-subtitle {
    white-space: nowrap; /* 2025-09-01: 桌面端副标题一行显示，移动端不受影响 */
  }
}

.hero-cta {
    margin-top: 2rem;
}

/* 关于山思 */
.about-section {
    padding: 120px 0;
    background-color: var(--background-light);
}

.about-intro {
    text-align: center;
    margin-bottom: 80px;
}

.about-intro h2 {
    font-family: var(--font-primary);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 2rem;
    letter-spacing: -1px;
}

/* 2025-08-31 调整：扩展关于山思文字区域宽度，使其与下方“核心技术”模块一致。
   原: max-width: 1000px; */
.about-description {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.about-description p {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    text-align: left;
}

.tech-showcase {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    /* 2025-08-31 调整：缩小卡片间距，使三张图彼此更靠近。原: gap: 30px; */
    /* 2025-08-31-2 微调：进一步缩小间距以提升可视面积。原: gap: 20px; */
    gap: 16px;
    /* 2025-08-31 调整：限制整体宽度与上方文字等宽(1000px)，并居中对齐 */
    /* 2025-08-31-3 扩展：与上方 about-description、下方核心技术保持一致外缘对齐 */
    max-width: var(--container-max-width);
    margin: 60px auto 0 auto; /* 原: margin-top: 60px; */
}

.tech-item {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    aspect-ratio: 1/1; /* 方形比例 */
}

.tech-image {
    width: 100%;
    height: 100%;
    position: relative;
}

.tech-item .tech-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    transition: var(--transition);
    /* 2025-08-31-2 微调：减小内边距以放大可视面积。原: padding: 10px; */
    padding: 6px;
    box-sizing: border-box;
}

.tech-item:hover .tech-image img {
    transform: scale(1.1);
}

.placeholder-image {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-light);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
}

.placeholder-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.placeholder-image.ai-tech {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.placeholder-image.remote-sensing {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.placeholder-image.iot-devices {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.placeholder-image.digital-twin {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.tech-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    /* 2025-08-31 再次调整：进一步缩小蒙层面积，保持外缘与上方文字对齐。
       原: height: 45%; padding: 28px 20px 20px; */
    /* 2025-08-31-2 再次细化：继续缩小蒙层占比与内边距，突出图片主体 */
    height: 34%;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.72));
    color: var(--text-light);
    padding: 18px 16px 16px;
    transform: translateY(100%);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 2;
    backdrop-filter: blur(8px);
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.tech-item:hover .tech-overlay {
    transform: translateY(0);
}

.tech-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px var(--shadow-medium);
}

.tech-overlay h3 {
    font-family: var(--font-primary);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.6rem;
    color: var(--accent-color);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    letter-spacing: 0.5px;
    transform: translateY(10px);
    opacity: 0;
    transition: all 0.3s ease 0.1s;
    line-height: 1.3;
}

.tech-overlay p {
    font-size: 0.85rem;
    opacity: 0.95;
    line-height: 1.5;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
    transform: translateY(15px);
    opacity: 0;
    transition: all 0.3s ease 0.2s;
    text-align: left;
    word-wrap: break-word;
    word-break: break-word;
    hyphens: auto;
    display: -webkit-box;
    -webkit-line-clamp: 6;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.tech-item:hover .tech-overlay h3,
.tech-item:hover .tech-overlay p {
    transform: translateY(0);
    opacity: 1;
}

/* 核心技术 */
.services-section {
    padding: 120px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, #34495e 100%);
    color: var(--text-light);
}

.services-intro {
    text-align: center;
    margin-bottom: 80px;
}

.services-intro h2 {
    font-family: var(--font-primary);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-light);
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.services-intro p {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto;
}

.tech-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 60px;
    max-width: 1200px;
    margin: 0 auto;
}

.tech-card {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 40px;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 40px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.tech-card:nth-child(even) {
    grid-template-columns: 1fr 400px;
}

.tech-card:nth-child(even) .tech-image {
    order: 2;
}

.tech-card:nth-child(even) .tech-content {
    order: 1;
}

.tech-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    transition: left 0.6s;
}

.tech-card:hover::before {
    left: 100%;
}

.tech-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.tech-image {
    width: 100%;
    height: 250px;
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
}

.tech-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.tech-card:hover .tech-image img {
    transform: scale(1.05);
}

.tech-image .placeholder-image {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.placeholder-image.ai-recognition {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.placeholder-image.drone-network {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.placeholder-image.digital-twin-eco {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.placeholder-image.model-3d {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.placeholder-image.data-security {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.tech-content h3 {
    font-family: var(--font-primary);
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-light);
}

.tech-content p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
}

.tech-action {
    margin-top: 1.5rem;
}

/* 2025-09-25 12:00:00 +08:00 修改：调整视频布局样式；修改人：AI助手；目标：视频横跨照片和文字下方；思路：修改tech-card布局为三行结构，视频占据底部全宽 */

/* 带视频的技术卡片特殊布局 */
.tech-card-with-video {
    display: grid;
    grid-template-columns: 400px 1fr;
    grid-template-rows: auto auto;
    gap: 40px 40px;
    grid-template-areas:
        "image content"
        "video video";
}

.tech-card-with-video .tech-image {
    grid-area: image;
}

.tech-card-with-video .tech-content {
    grid-area: content;
}

.tech-card-with-video .tech-video {
    grid-area: video;
    margin-top: 0;
    width: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

.tech-card-with-video .tech-video:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.tech-video video {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius);
    background: #000;
}

.tech-video video::-webkit-media-controls-panel {
    background-color: rgba(0, 0, 0, 0.8);
}

/* 确保奇偶行的布局也适用于带视频的卡片 */
.tech-card-with-video:nth-child(even) {
    grid-template-columns: 1fr 400px;
    grid-template-areas:
        "content image"
        "video video";
}

/* 2025-09-25 12:10:00 +08:00 修改：技术卡片按钮样式；修改人：AI助手；目标：美化按钮外观；思路：增加按钮尺寸和视觉效果 */
.tech-action {
    margin-top: 1.5rem;
}

.tech-action .btn {
    padding: 12px 24px;
    font-size: 14px;
    text-transform: none;
    letter-spacing: 0.3px;
}

/* 2025-09-25 12:15:00 +08:00 修改：山思系统按钮特殊样式；修改人：AI助手；目标：增加按钮宽度和自适应；思路：增加内边距，使用自适应宽度 */
.system-btn {
    background: linear-gradient(135deg, #3498db, #2980b9) !important;
    border: none !important;
    color: white !important;
    padding: 16px 36px !important;
    font-size: 16px !important;
    font-weight: 600 !important;
    border-radius: 8px !important;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3) !important;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) !important;
    text-decoration: none !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 10px !important;
    position: relative !important;
    overflow: hidden !important;
    min-width: auto !important;
    width: auto !important;
    white-space: nowrap !important;
}

.system-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.system-btn:hover::before {
    left: 100%;
}

.system-btn:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 8px 25px rgba(52, 152, 219, 0.4) !important;
    background: linear-gradient(135deg, #2980b9, #1f5f8b) !important;
}

.system-btn:active {
    transform: translateY(0) !important;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3) !important;
}

.system-btn i {
    font-size: 14px;
    transition: transform 0.3s ease;
}

.system-btn:hover i {
    transform: translateX(2px);
}

/* 项目案例 */
.projects-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.projects-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('../assets/project.avif') center/cover no-repeat;
    background-attachment: fixed;
}

.projects-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--background-overlay);
    z-index: 1;
}

.projects-content {
    position: relative;
    z-index: 2;
    padding: 120px 0;
    text-align: center;
}

.projects-content h2 {
    font-family: var(--font-primary);
    font-size: 4rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 80px;
    letter-spacing: -1px;
    text-shadow: 2px 2px 4px var(--shadow-medium);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px;
    max-width: 1200px;
    margin: 0 auto;
}

.project-item {
    background: rgba(254, 250, 240, 0.15);
    backdrop-filter: blur(15px);
    border: 1px solid var(--accent-color);
    border-radius: var(--border-radius);
    padding: 50px 30px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 25px var(--shadow-light);
}

.project-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(243, 241, 196, 0.2), transparent);
    transition: left 0.8s;
}

.project-item:hover::before {
    left: 100%;
}

.project-item:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 25px 50px var(--shadow-medium);
    border-color: var(--accent-color);
    background: rgba(254, 250, 240, 0.25);
}

.project-number {
    display: inline-block;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent-color), var(--background-accent));
    color: var(--primary-color);
    border-radius: 50%;
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 80px;
    margin-bottom: 30px;
    position: relative;
    z-index: 1;
    box-shadow: 0 10px 20px var(--shadow-medium);
    border: 2px solid var(--accent-color);
}

.project-item h3 {
    font-family: var(--font-primary);
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.project-item p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--background-light);
    position: relative;
    z-index: 1;
}

/* 合作伙伴 */
.partners-section {
    padding: 100px 0;
    background-color: var(--background-neutral);
}

.partners-section h3 {
    text-align: center;
    font-family: var(--font-primary);
    font-size: 2.5rem;
    color: var(--text-secondary);
    margin-bottom: 60px;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 700;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.partner-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 120px;
    background-color: var(--background-light);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    padding: 15px;
}

.partner-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: var(--transition);
    filter: grayscale(20%) opacity(0.8);
}

.partner-logo:hover img {
    filter: grayscale(0%) opacity(1);
    transform: scale(1.05);
}

.partner-logo::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(52, 152, 219, 0.1), transparent);
    transition: left 0.6s;
}

.partner-logo:hover::before {
    left: 100%;
}

.partner-logo:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 8px 25px var(--shadow-medium);
    border: 2px solid rgba(52, 152, 219, 0.3);
}

.logo-placeholder {
    font-weight: 700;
    color: var(--text-secondary);
    font-size: 16px;
    letter-spacing: 1px;
    text-transform: uppercase;
    position: relative;
    z-index: 1;
}

/* 新闻动态 */
.news-section {
    padding: 120px 0;
    background-color: var(--background-light);
}

.news-header {
    text-align: center;
    margin-bottom: 80px;
}

.news-header h2 {
    font-family: var(--font-primary);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.news-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    max-width: 900px;
    margin: 0 auto;
}

.news-item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 30px;
    background: var(--background-light);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    padding: 30px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.news-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(52, 152, 219, 0.05), transparent);
    transition: left 0.6s;
}

.news-item:hover::before {
    left: 100%;
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px var(--shadow-medium);
    border-color: rgba(52, 152, 219, 0.2);
}

.news-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-light);
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.news-date .month {
    font-size: 2rem;
    font-weight: 700;
    font-family: var(--font-primary);
    line-height: 1;
}

.news-date .year {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 5px;
}

.news-content {
    position: relative;
    z-index: 1;
}

.news-content h3 {
    font-family: var(--font-primary);
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 15px;
    line-height: 1.4;
}

.news-content p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.news-footer {
    text-align: center;
    margin-top: 60px;
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 15px 40px;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-light);
}

/* Montek.tech 联系部分 */
.contact-section {
    padding: 120px 0;
    background: linear-gradient(135deg, var(--background-neutral) 0%, var(--background-accent) 100%);
}

.contact-header {
    text-align: center;
    margin-bottom: 80px;
}

.contact-header h2 {
    font-family: var(--font-primary);
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    letter-spacing: -2px;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

/* 左列：联系信息 */
.contact-info-column {
    display: flex;
    flex-direction: column;
    gap: 50px;
    margin-top: 60px;
}

.contact-details .contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.contact-icon {
    font-size: 1.5rem;
    width: 35px;
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-icon i {
    font-size: 1.3rem;
}

.address-info p {
    margin: 0 0 10px 0;
    line-height: 1.6;
}

.address-info strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* 社交媒体链接 */
.social-media {
    margin-top: 20px;
}

.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.social-link {
    display: inline-block;
    padding: 12px 24px;
    background: var(--background-light);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid transparent;
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px var(--shadow-medium);
}

.social-link.facebook:hover {
    background: #1877f2;
    color: white;
    border-color: #1877f2;
}

.social-link.instagram:hover {
    background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    color: white;
}

.social-link.twitter:hover {
    background: #000000;
    color: white;
    border-color: #000000;
}

.social-link.tiktok:hover {
    background: #000000;
    color: white;
    border-color: #000000;
}

/* 右列：联系表单 */
.contact-form-column {
    background: var(--background-light);
    border-radius: var(--border-radius);
    padding: 50px;
    box-shadow: 0 10px 30px var(--shadow-light);
}

.form-wrapper h3 {
    font-family: var(--font-primary);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 40px;
    text-align: center;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group input,
.form-group textarea {
    padding: 15px 20px;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: var(--font-secondary);
    background-color: var(--background-light);
    color: var(--text-secondary);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(64, 63, 43, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #adb5bd;
    font-style: italic;
}

.contact-form .btn {
    align-self: center;
    padding: 18px 50px;
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 20px;
}



/* 网站底部 */
.site-footer {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-light);
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 60px;
    margin-bottom: 50px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.footer-logo .logo-icon {
    font-size: 32px;
}

.footer-logo .logo-text {
    font-family: var(--font-primary);
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 1px;
}

.footer-brand p {
    font-size: 1.2rem;
    opacity: 0.9;
    font-style: italic;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    text-decoration: none;
    font-size: 1.3rem;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--accent-color);
    transform: translateY(-3px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-family: var(--font-primary);
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--text-light);
}

.footer-column ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-column ul li {
    margin-bottom: 12px;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
    font-size: 15px;
}

.footer-column a:hover {
    color: var(--accent-color);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 14px;
    opacity: 0.8;
}

/* 超大屏幕优化 */
@media (min-width: 1600px) {
    .page-wrapper {
        box-shadow: 0 0 80px var(--shadow-medium);
    }

    .container {
        max-width: var(--container-max-width-large);
    }

    /* 增大字体和间距 */
    .hero-title {
        font-size: 5rem;
    }

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .contact-header h2 {
        font-size: 5rem;
    }

    .news-header h2 {
        font-size: 4rem;
    }
}

/* 新闻弹窗样式 */
.news-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.news-modal-content {
    background-color: #fefaf0;
    margin: 5% auto;
    padding: 0;
    border-radius: 12px;
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(67, 66, 46, 0.3);
    animation: modalSlideIn 0.3s ease-out;
}

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

.news-modal-header {
    padding: 24px 32px;
    border-bottom: 2px solid #f3f1c4;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, #403f2b 0%, #43422e 100%);
    color: #fefaf0;
}

.news-modal-header h2 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.news-modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #fefaf0;
    padding: 4px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.news-modal-close:hover {
    background-color: rgba(254, 250, 240, 0.15);
}

.news-modal-body {
    padding: 32px;
    max-height: 60vh;
    overflow-y: auto;
    background-color: #f7f7f5;
}

.news-modal-grid {
    display: grid;
    gap: 24px;
}

.news-modal-item {
    padding: 24px;
    border: 1px solid #f3f1c4;
    border-radius: 8px;
    transition: all 0.3s ease;
    background: #fefaf0;
}

.news-modal-item:hover {
    box-shadow: 0 4px 12px rgba(67, 66, 46, 0.15);
    transform: translateY(-2px);
    border-color: #f5f3cd;
}

.news-modal-item-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.news-modal-date {
    background: linear-gradient(135deg, #403f2b 0%, #43422e 100%);
    color: #fefaf0;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
}

.news-modal-item h3 {
    margin: 0 0 12px 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: #403f2b;
    line-height: 1.4;
}

.news-modal-item p {
    margin: 0;
    color: #c4c1b4;
    line-height: 1.6;
}

/* 修复英文&符号字体 - 全局设置 */
* {
    font-variant-ligatures: none;
}

/* 强制所有文本使用标准字体，避免装饰性&符号 */
body, h1, h2, h3, h4, h5, h6, p, span, div {
    font-feature-settings: "liga" 0, "dlig" 0;
}

/* 新闻弹窗响应式设计 */
@media (max-width: 768px) {
    .news-modal-content {
        margin: 10% auto;
        width: 95%;
        max-height: 85vh;
    }

    .news-modal-header {
        padding: 20px 24px;
    }

    .news-modal-header h2 {
        font-size: 1.25rem;
    }

    .news-modal-body {
        padding: 24px 20px;
    }

    .news-modal-item {
        padding: 20px;
    }

    .news-modal-item-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .news-modal-item h3 {
        font-size: 1.125rem;
    }
}

/* AI物种识别引擎详细页面样式 */
.tech-detail-section {
    min-height: 100vh;
    position: relative;
    padding: 120px 0 80px;
    background: var(--background-dark);
}

.tech-detail-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    opacity: 0.9;
}

.tech-detail-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
}

.tech-detail-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 30px;
}

/* 返回按钮 */
.back-navigation {
    margin-bottom: 40px;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 10px 20px;
    border-radius: 25px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(-5px);
}

/* 页面标题 */
.tech-detail-header {
    text-align: center;
    margin-bottom: 80px;
}

.tech-detail-header h1 {
    font-family: var(--font-primary);
    font-size: 4rem;
    font-weight: 700;
    color: var(--text-light);
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.tech-detail-header p {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 技术概览 */
.tech-overview {
    margin-bottom: 80px;
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.overview-item {
    text-align: center;
    padding: 40px 30px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.overview-item:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.1);
}

.overview-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary-color);
}

.overview-item h3 {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 15px;
}

.overview-item p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

/* 技术特性 */
.tech-features {
    margin-bottom: 80px;
}

.tech-features h2 {
    font-family: var(--font-primary);
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.1);
}

.feature-card h3 {
    font-family: var(--font-primary);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 15px;
}

.feature-card p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

/* 纵向特性布局 */
.features-vertical {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 40px;
    padding: 40px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.1);
}

.feature-content {
    flex: 1;
}

.feature-content h3 {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.feature-content p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
    font-size: 1.1rem;
}

.feature-image {
    flex: 0 0 600px;
    height: 300px;
    border-radius: var(--border-radius);
    overflow: hidden;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: var(--border-radius);
}

/* 竖向图片特殊样式 */
.feature-image-vertical {
    flex: 0 0 600px;
    height: 300px;
    border-radius: var(--border-radius);
    overflow: hidden;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-image-vertical img {
    width: auto;
    height: 100%;
    max-width: 100%;
    object-fit: contain;
}

/* 应用场景 */
.tech-applications {
    margin-bottom: 80px;
}

.tech-applications h2 {
    font-family: var(--font-primary);
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 60px;
}

.applications-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.application-item {
    display: flex;
    align-items: center;
    gap: 30px;
    padding: 30px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.application-item:hover {
    transform: translateX(10px);
    background: rgba(255, 255, 255, 0.1);
}

.application-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.application-content h3 {
    font-family: var(--font-primary);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 10px;
}

.application-content p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

/* 技术优势 */
.tech-advantages {
    margin-bottom: 80px;
}

.tech-advantages h2 {
    font-family: var(--font-primary);
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 60px;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.advantage-item {
    text-align: center;
    padding: 40px 30px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.advantage-item:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.1);
}

.advantage-number {
    font-family: var(--font-primary);
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 15px;
}

.advantage-item h3 {
    font-family: var(--font-primary);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 10px;
}

.advantage-item p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

/* 联系我们 */
.tech-contact {
    margin-bottom: 40px;
}

.contact-card {
    text-align: center;
    padding: 60px 40px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    max-width: 600px;
    margin: 0 auto;
}

.contact-card h2 {
    font-family: var(--font-primary);
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-light);
    margin-bottom: 20px;
}

.contact-card p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
    margin-bottom: 30px;
}

/* 详细页面响应式设计 */
@media (max-width: 768px) {
    .tech-detail-header h1 {
        font-size: 2.5rem;
    }

    .tech-detail-header p {
        font-size: 1.1rem;
    }

    .overview-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    /* 纵向特性布局的移动端适配 */
    .feature-item {
        flex-direction: column;
        gap: 20px;
        padding: 30px 20px;
    }

    .feature-image {
        flex: none;
        width: 100%;
        height: calc(100vw / 2);
        max-height: 200px;
    }

    .feature-image-vertical {
        flex: none;
        width: 100%;
        height: calc(100vw / 2);
        max-height: 200px;
        background: transparent;
    }

    .application-item {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .tech-features h2,
    .tech-applications h2,
    .tech-advantages h2 {
        font-size: 2rem;
    }
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        padding: 0 20px;
    }

    .tech-showcase {
        grid-template-columns: repeat(3, 1fr);
        gap: 25px;
    }

    .tech-card {
        grid-template-columns: 1fr;
        gap: 20px;
        text-align: center;
    }

    .tech-card:nth-child(even) {
        grid-template-columns: 1fr;
    }

    .tech-card:nth-child(even) .tech-image,
    .tech-card:nth-child(even) .tech-content {
        order: unset;
    }

    .tech-image {
        height: 200px;
    }

    /* 2025-09-25 11:50:00 +08:00 新增：移动端视频样式；修改人：AI助手；目标：确保视频在移动端正常显示；思路：调整视频容器边距和阴影 */
    .tech-video {
        margin-top: 1rem;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .projects-content h2 {
        font-size: 2.5rem;
    }

    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(4, 1fr);
        gap: 30px;
    }

    .partners-section h3 {
        font-size: 2rem;
    }

    .news-item {
        grid-template-columns: 120px 1fr;
        gap: 20px;
        padding: 25px;
    }

    .news-header h2 {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        padding: 0 30px; /* 移动端减少左右内边距 */
    }

    .nav-right {
        gap: 20px;
    }

    .nav-menu {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .logo-image {
        height: 32px;
    }

    .logo-text {
        font-size: 20px;
        line-height: 1.2;
    }

    .lang-btn {
        padding: 6px 12px;
        font-size: 12px;
        min-width: 70px;
    }

    .hero-title {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .about-intro h2 {
        font-size: 2.5rem;
    }

    .tech-showcase {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .tech-card {
        grid-template-columns: 1fr;
        gap: 20px;
        text-align: center;
    }

    .tech-card:nth-child(even) {
        grid-template-columns: 1fr;
    }

    .tech-card:nth-child(even) .tech-image,
    .tech-card:nth-child(even) .tech-content {
        order: unset;
    }

    /* 2025-09-25 12:00:00 +08:00 新增：带视频卡片的移动端适配；修改人：AI助手；目标：移动端单列布局；思路：重置grid布局为单列，保持视频在底部 */
    .tech-card-with-video {
        display: grid;
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        gap: 20px;
        grid-template-areas:
            "image"
            "content"
            "video";
        text-align: center;
    }

    .tech-card-with-video:nth-child(even) {
        grid-template-columns: 1fr;
        grid-template-areas:
            "image"
            "content"
            "video";
    }

    .tech-image {
        height: 180px;
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .projects-content h2 {
        font-size: 2rem;
    }

    .project-item {
        padding: 40px 25px;
    }

    .partners-grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(8, 1fr);
        gap: 20px;
    }

    .partners-section h3 {
        font-size: 1.8rem;
    }

    .partner-logo {
        height: 100px;
    }

    .news-item {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 20px;
        text-align: center;
    }

    .news-header h2 {
        font-size: 2rem;
    }

    .news-date {
        width: 120px;
        margin: 0 auto;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .contact-header h2 {
        font-size: 2.5rem;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .contact-form-column {
        padding: 40px 30px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-header h2 {
        font-size: 2rem;
    }

    .contact-form-column {
        padding: 30px 20px;
    }

    .social-links {
        justify-content: center;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .about-contact-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .contact-form-wrapper {
        position: static;
        padding: 30px 20px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .about-intro h2 {
        font-size: 2rem;
    }

    .about-content h2 {
        font-size: 2.2rem;
    }

    .service-card {
        padding: 30px 20px;
    }

    .contact-form h3 {
        font-size: 1.5rem;
    }

    .partners-grid {
        grid-template-columns: 1fr;
    }
}