/**
 * 仙瑜科技官网 - 全局样式表
 * 设计风格：浅蓝科技风，高端大气
 * 配色方案：以极光蓝(#0288D1)为主色调，搭配浅蓝渐变背景
 * 字体方案：使用系统字体栈，无需加载外部字体CDN，提升页面加载速度
 */

/* ===== CSS变量定义（浅蓝科技风配色方案）===== */
:root {
    /* 主色调 - 极光蓝系列，用于按钮、链接、高亮等 */
    --deep-space: #E8F4FD;        /* 深空蓝 - 浅色背景 */
    --aurora-blue: #0288D1;       /* 极光蓝 - 主要强调色 */
    --aurora-blue-dark: #01579B;  /* 深极光蓝 - 标题渐变色 */
    --matte-silver: #2C3E6B;      /* 哑光银 - 辅助深色 */
    /* 辅助色 - 用于特殊场景点缀 */
    --light-gray: #F0F8FF;        /* 浅灰蓝 - 次级背景 */
    --tech-gold: #D4AF37;         /* 科技金 - 高端点缀色 */
    /* 文字色 - 控制文字层级和可读性 */
    --text-dark: #1B2A4A;         /* 深色文字 - 主标题 */
    --text-muted: #5A7090;        /* 灰色文字 - 正文/副标题 */
    --text-white: #1B2A4A;        /* 深色文字（用于浅色背景） */
    /* 背景色 - 分层背景营造纵深感 */
    --bg-dark: #DCE9F5;           /* 深色背景 - 交替区块 */
    --bg-darker: #EBF5FB;         /* 主背景色 - 页面底色 */
    --bg-card: rgba(255, 255, 255, 0.85);   /* 卡片背景 - 半透明白色 */
    --bg-glass: rgba(2, 136, 209, 0.04);    /* 毛玻璃背景 - 极淡蓝色 */
    /* 渐变 - 用于按钮、背景、装饰元素 */
    --gradient-aurora: linear-gradient(135deg, #40C4FF 0%, #0288D1 100%);    /* 极光渐变 - 主按钮 */
    --gradient-dark: linear-gradient(180deg, #D6EAF8 0%, #EBF5FB 50%, #E0EDF8 100%); /* 页面背景渐变 */
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(240, 248, 255, 0.95) 100%); /* 卡片渐变 */
    --gradient-glow: linear-gradient(135deg, rgba(2, 136, 209, 0.15) 0%, rgba(64, 196, 255, 0.08) 100%);  /* 发光渐变 */
    /* 阴影 - 营造层次感和悬浮效果 */
    --shadow-sm: 0 2px 8px rgba(0, 60, 120, 0.08);       /* 小阴影 - 卡片默认 */
    --shadow-md: 0 4px 16px rgba(0, 60, 120, 0.1);       /* 中阴影 - 弹窗/表单 */
    --shadow-lg: 0 8px 32px rgba(0, 60, 120, 0.12);      /* 大阴影 - 模态框 */
    --shadow-glow: 0 0 20px rgba(2, 136, 209, 0.1);      /* 发光阴影 - hover效果 */
    --shadow-glow-strong: 0 0 40px rgba(2, 136, 209, 0.15); /* 强发光 - 卡片hover */
    /* 圆角 - 统一圆角风格 */
    --radius-sm: 8px;    /* 小圆角 - 标签、输入框 */
    --radius-md: 12px;   /* 中圆角 - 按钮、卡片 */
    --radius-lg: 20px;   /* 大圆角 - 大卡片、弹窗 */
    /* 过渡动画 - 统一动画曲线 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);       /* 标准过渡 */
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);  /* 慢速过渡 */
}

/* ===== 全局重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Montserrat', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-darker);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ===== 通用容器 ===== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 加载动画 ===== */
.page-loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--bg-darker);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.page-loader.loaded {
    opacity: 0;
    visibility: hidden;
}

.loader-particles {
    position: relative;
    width: 80px;
    height: 80px;
}

.loader-particles span {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--aurora-blue);
    border-radius: 50%;
    animation: loaderParticle 1.4s ease-in-out infinite;
}

.loader-particles span:nth-child(1) { top: 0; left: 50%; transform: translateX(-50%); animation-delay: 0s; }
.loader-particles span:nth-child(2) { top: 50%; right: 0; transform: translateY(-50%); animation-delay: 0.2s; }
.loader-particles span:nth-child(3) { bottom: 0; left: 50%; transform: translateX(-50%); animation-delay: 0.4s; }
.loader-particles span:nth-child(4) { top: 50%; left: 0; transform: translateY(-50%); animation-delay: 0.6s; }
.loader-particles span:nth-child(5) { top: 50%; left: 50%; transform: translate(-50%, -50%); animation-delay: 0.8s; width: 12px; height: 12px; }

@keyframes loaderParticle {
    0%, 100% { opacity: 0.3; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1.2); }
}

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: transparent;
    transition: var(--transition);
    padding: 0;
}

.header.scrolled {
    background: rgba(235, 245, 251, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(2, 136, 209, 0.1), var(--shadow-sm);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    letter-spacing: 0.5px;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-aurora);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: white;
    box-shadow: 0 0 15px rgba(2, 136, 209, 0.2);
    overflow: hidden;
}

.logo-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
}

.logo-text {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    background: linear-gradient(135deg, #0288D1 0%, #01579B 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: 40px;
}

.nav a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-muted);
    position: relative;
    padding: 8px 0;
    letter-spacing: 0.5px;
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-aurora);
    transition: var(--transition);
    border-radius: 1px;
}

.nav a:hover,
.nav a.active {
    color: var(--aurora-blue);
}

.nav a:hover::after,
.nav a.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-dark);
}

/* ===== 按钮通用样式 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-aurora);
    color: #FFFFFF;
    box-shadow: 0 4px 20px rgba(2, 136, 209, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 6px 30px rgba(2, 136, 209, 0.4);
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    opacity: 0;
    transition: var(--transition);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-secondary {
    background: transparent;
    color: var(--text-dark);
    border: 1px solid rgba(2, 136, 209, 0.4);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(2, 136, 209, 0.08);
    border-color: var(--aurora-blue);
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 0 20px rgba(2, 136, 209, 0.15);
}

.btn-outline {
    background: transparent;
    color: var(--aurora-blue);
    border: 1px solid var(--aurora-blue);
    padding: 10px 24px;
    font-size: 14px;
}

.btn-outline:hover {
    background: rgba(2, 136, 209, 0.08);
    transform: scale(1.03);
    box-shadow: var(--shadow-glow);
}

/* ===== Hero区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 72px;
    overflow: hidden;
    background: linear-gradient(135deg, #D6EAF8 0%, #EBF5FB 30%, #E0EDF8 60%, #D4E6F1 100%);
}

#hero-particles {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.hero-bg-lines {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.hero-bg-lines::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(2, 136, 209, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(64, 196, 255, 0.06) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 80%, rgba(2, 136, 209, 0.05) 0%, transparent 45%);
    animation: heroBgMove 20s ease-in-out infinite;
}

@keyframes heroBgMove {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(2%, -1%) rotate(1deg); }
    66% { transform: translate(-1%, 2%) rotate(-1deg); }
}

.hero .container {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 900px;
}

.hero-content {
    color: var(--text-dark);
}

.hero-title {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 52px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #01579B 0%, #0288D1 50%, #1B2A4A 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.hero-desc {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-muted);
    margin-bottom: 44px;
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
}

.scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 12px;
    letter-spacing: 2px;
    text-transform: uppercase;
    animation: scrollHintFade 2s ease-in-out infinite;
}

.scroll-hint-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--aurora-blue);
    border-bottom: 2px solid var(--aurora-blue);
    transform: rotate(45deg);
    opacity: 0.6;
    animation: scrollArrowBounce 2s ease-in-out infinite;
}

@keyframes scrollHintFade {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}

@keyframes scrollArrowBounce {
    0%, 100% { transform: rotate(45deg) translateY(0); }
    50% { transform: rotate(45deg) translateY(6px); }
}

/* ===== 关于我们区域 ===== */
.about-section {
    position: relative;
    padding: 120px 0;
    background: #DCE9F5;
    overflow: hidden;
}

.about-section::before {
    content: '';
    position: absolute;
    right: -100px;
    top: -100px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(2, 136, 209, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.about-section .container {
    display: flex;
    align-items: center;
    gap: 80px;
}

.about-content {
    flex: 1;
}

.about-content .section-tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(2, 136, 209, 0.08);
    border: 1px solid rgba(2, 136, 209, 0.2);
    border-radius: 20px;
    color: var(--aurora-blue);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.about-content h2 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 34px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
    line-height: 1.3;
}

.about-content p {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.9;
}

.about-visual {
    flex: 1;
    position: relative;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-image {
    width: 100%;
    max-width: 520px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    object-fit: contain;
}

.about-tech-bg {
    width: 100%;
    height: 100%;
    min-height: 400px;
    background: var(--gradient-card);
    border: 1px solid rgba(2, 136, 209, 0.12);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.about-tech-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(2, 136, 209, 0.03) 40px, rgba(2, 136, 209, 0.03) 41px),
        repeating-linear-gradient(90deg, transparent, transparent 40px, rgba(2, 136, 209, 0.03) 40px, rgba(2, 136, 209, 0.03) 41px);
}

.about-tech-bg .tech-icon {
    font-size: 80px;
    opacity: 0.2;
    position: relative;
    z-index: 1;
    color: var(--aurora-blue);
}

/* ===== 通用板块标题 ===== */
.section-tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(2, 136, 209, 0.08);
    border: 1px solid rgba(2, 136, 209, 0.2);
    border-radius: 20px;
    color: var(--aurora-blue);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== 产品矩阵区域 ===== */
.products-section {
    position: relative;
    padding: 120px 0;
    background: var(--bg-darker);
}

.products-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 30% 20%, rgba(2, 136, 209, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(64, 196, 255, 0.03) 0%, transparent 50%);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    position: relative;
    z-index: 1;
}

.product-card {
    background: var(--gradient-card);
    border: 1px solid rgba(2, 136, 209, 0.1);
    border-radius: var(--radius-lg);
    padding: 40px 36px;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.product-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(2, 136, 209, 0.04) 0%, transparent 60%);
    opacity: 0;
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-4px) scale(1.03);
    border-color: rgba(2, 136, 209, 0.25);
    box-shadow: var(--shadow-glow-strong);
}

.product-card:hover::before {
    opacity: 1;
}

.product-card-inner {
    position: relative;
    z-index: 1;
}

.product-number {
    font-family: 'Montserrat', sans-serif;
    font-size: 13px;
    font-weight: 700;
    color: var(--aurora-blue);
    letter-spacing: 2px;
    margin-bottom: 12px;
    opacity: 0.7;
}

.product-card h3 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.product-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
    line-height: 1.6;
}

.product-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 28px;
}

.highlight-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background: rgba(2, 136, 209, 0.05);
    border: 1px solid rgba(2, 136, 209, 0.12);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 13px;
    transition: var(--transition);
}

.highlight-tag .tag-icon {
    font-size: 14px;
    color: var(--aurora-blue);
}

.product-card:hover .highlight-tag {
    border-color: rgba(2, 136, 209, 0.25);
    color: var(--text-dark);
}

.product-card-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--aurora-blue);
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
}

.product-card-btn::after {
    content: '→';
    transition: var(--transition);
}

.product-card:hover .product-card-btn {
    gap: 12px;
}

.product-card:hover .product-card-btn::after {
    transform: translateX(4px);
}

/* ===== 核心技术优势 ===== */
.tech-section {
    position: relative;
    padding: 120px 0;
    background: #DCE9F5;
    overflow: hidden;
}

.tech-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        repeating-linear-gradient(0deg, transparent, transparent 60px, rgba(2, 136, 209, 0.02) 60px, rgba(2, 136, 209, 0.02) 61px),
        repeating-linear-gradient(90deg, transparent, transparent 60px, rgba(2, 136, 209, 0.02) 60px, rgba(2, 136, 209, 0.02) 61px);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    position: relative;
    z-index: 1;
}

.tech-card {
    text-align: center;
    padding: 48px 28px;
    border-radius: var(--radius-lg);
    background: var(--gradient-card);
    border: 1px solid rgba(2, 136, 209, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.tech-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: var(--gradient-aurora);
    opacity: 0;
    transition: var(--transition);
}

.tech-card:hover {
    transform: translateY(-4px) scale(1.03);
    border-color: rgba(2, 136, 209, 0.2);
    box-shadow: var(--shadow-glow);
}

.tech-card:hover::before {
    opacity: 1;
}

.tech-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    background: rgba(2, 136, 209, 0.08);
    border: 1px solid rgba(2, 136, 209, 0.15);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    transition: var(--transition);
}

.tech-card:hover .tech-icon {
    background: rgba(2, 136, 209, 0.12);
    box-shadow: 0 0 20px rgba(2, 136, 209, 0.15);
}

.tech-card h3 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 17px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.tech-card p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ===== 联系我们区域 ===== */
.contact-section {
    position: relative;
    padding: 120px 0;
    background: var(--bg-darker);
    overflow: hidden;
}

.contact-section::before {
    content: '';
    position: absolute;
    left: -200px;
    bottom: -200px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(2, 136, 209, 0.04) 0%, transparent 70%);
    border-radius: 50%;
}

.contact-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
    position: relative;
    z-index: 1;
}

.contact-info h2 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 32px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
    line-height: 1.3;
}

.contact-info > p {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 40px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-item-icon {
    width: 48px;
    height: 48px;
    background: rgba(2, 136, 209, 0.08);
    border: 1px solid rgba(2, 136, 209, 0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--aurora-blue);
    flex-shrink: 0;
}

.contact-item-text .label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.contact-item-text .value {
    font-size: 15px;
    color: var(--text-dark);
    font-weight: 600;
}

/* 联系表单 */
.contact-form-card {
    background: var(--gradient-card);
    border: 1px solid rgba(2, 136, 209, 0.12);
    border-radius: var(--radius-lg);
    padding: 48px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
}

.contact-form-card h3 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    font-size: 15px;
    border: 1px solid rgba(2, 136, 209, 0.15);
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-family: inherit;
    background: rgba(255, 255, 255, 0.8);
    color: var(--text-dark);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--aurora-blue);
    box-shadow: 0 0 0 3px rgba(2, 136, 209, 0.1);
    background: rgba(255, 255, 255, 0.95);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #99AABB;
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%230288D1' viewBox='0 0 16 16'%3E%3Cpath d='M8 12L2 6h12z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
}

.form-group select option {
    background: #FFFFFF;
    color: var(--text-dark);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.form-submit-btn {
    width: 100%;
    margin-top: 8px;
}

/* ===== 咨询弹窗 ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.98) 0%, rgba(240, 248, 255, 0.98) 100%);
    border: 1px solid rgba(2, 136, 209, 0.15);
    border-radius: var(--radius-lg);
    padding: 48px;
    max-width: 480px;
    width: 90%;
    position: relative;
    transform: translateY(20px) scale(0.95);
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
}

.modal-overlay.active .modal-content {
    transform: translateY(0) scale(1);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    background: rgba(2, 136, 209, 0.08);
    border: 1px solid rgba(2, 136, 209, 0.15);
    border-radius: 50%;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.modal-close:hover {
    background: rgba(2, 136, 209, 0.15);
    color: var(--aurora-blue);
}

.modal-content h3 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.modal-content > p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 32px;
}

/* ===== 底部Footer ===== */
.footer {
    background: #CDDFEF;
    border-top: 1px solid rgba(2, 136, 209, 0.1);
    padding: 48px 0 24px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(2, 136, 209, 0.3), transparent);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.footer-section p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 8px;
    line-height: 1.7;
}

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

.footer-section ul li a {
    font-size: 14px;
    color: var(--text-muted);
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--aurora-blue);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(2, 136, 209, 0.08);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
    opacity: 0.7;
}

.footer-bottom a {
    color: var(--text-muted);
}

.footer-bottom a:hover {
    color: var(--aurora-blue);
}

/* ===== 产品中心页面 ===== */
.page-header {
    background: linear-gradient(135deg, #D6EAF8 0%, #EBF5FB 100%);
    padding: 140px 0 80px;
    text-align: center;
    color: var(--text-dark);
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 50% 50%, rgba(2, 136, 209, 0.06) 0%, transparent 60%);
}

.page-header h1 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
    color: var(--text-dark);
}

.page-header p {
    font-size: 18px;
    color: var(--text-muted);
    position: relative;
    z-index: 1;
}

.products-page {
    padding: 80px 0 120px;
    background: var(--bg-darker);
}

/* ===== 产品详情页 ===== */
.product-detail-banner {
    background: linear-gradient(135deg, #D6EAF8 0%, #EBF5FB 100%);
    padding: 120px 0 60px;
    position: relative;
    overflow: hidden;
}

.product-detail-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 80%, rgba(2, 136, 209, 0.06) 0%, transparent 60%);
}

.product-detail-banner .container {
    position: relative;
    z-index: 1;
}

.product-detail-banner .breadcrumb {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.product-detail-banner .breadcrumb a {
    color: var(--aurora-blue);
}

.product-detail-banner h1 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 44px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.product-detail-banner .slogan {
    font-size: 18px;
    color: var(--aurora-blue);
    font-weight: 500;
}

.product-detail-body {
    padding: 60px 0 120px;
    background: var(--bg-darker);
}

.product-detail-body .container {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 60px;
}

.product-sidebar {
    position: sticky;
    top: 96px;
    align-self: start;
}

.product-sidebar nav {
    background: var(--gradient-card);
    border: 1px solid rgba(2, 136, 209, 0.1);
    border-radius: var(--radius-md);
    padding: 8px;
    box-shadow: var(--shadow-sm);
}

.product-sidebar nav a {
    display: block;
    padding: 12px 20px;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
    margin-bottom: 2px;
}

.product-sidebar nav a:hover,
.product-sidebar nav a.active {
    color: var(--aurora-blue);
    background: rgba(2, 136, 209, 0.08);
}

.product-sidebar .btn {
    width: 100%;
    margin-top: 24px;
}

.product-main {
    min-width: 0;
}

.product-main section {
    margin-bottom: 60px;
}

.product-main section:last-child {
    margin-bottom: 0;
}

.product-main h2 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(2, 136, 209, 0.12);
}

.product-main p {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.9;
    margin-bottom: 16px;
}

.product-main .highlight {
    color: var(--aurora-blue);
    font-weight: 600;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 24px;
}

.feature-item {
    background: var(--gradient-card);
    border: 1px solid rgba(2, 136, 209, 0.1);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.feature-item:hover {
    border-color: rgba(2, 136, 209, 0.2);
    box-shadow: var(--shadow-glow);
}

.feature-item .feature-icon {
    font-size: 28px;
    margin-bottom: 12px;
    display: block;
    color: var(--aurora-blue);
    width: 48px;
    height: 48px;
    background: rgba(2, 136, 209, 0.08);
    border: 1px solid rgba(2, 136, 209, 0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 0;
}

.tech-advantage-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 24px;
}

.tech-advantage-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 24px;
    background: var(--gradient-card);
    border: 1px solid rgba(2, 136, 209, 0.08);
    border-radius: var(--radius-md);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.tech-advantage-item:hover {
    border-color: rgba(2, 136, 209, 0.15);
}

.tech-advantage-item .num {
    font-family: 'Montserrat', sans-serif;
    font-size: 24px;
    font-weight: 800;
    color: var(--aurora-blue);
    opacity: 0.4;
    flex-shrink: 0;
    min-width: 36px;
}

.tech-advantage-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.tech-advantage-item p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 0;
}

.scene-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.scene-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: rgba(2, 136, 209, 0.05);
    border: 1px solid rgba(2, 136, 209, 0.12);
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 14px;
    transition: var(--transition);
}

.scene-tag i {
    font-size: 16px;
    color: var(--aurora-blue);
}

.scene-tag:hover {
    border-color: rgba(2, 136, 209, 0.3);
    color: var(--aurora-blue);
    background: rgba(2, 136, 209, 0.08);
}

/* ===== 关于我们页面 ===== */
.about-page-section {
    padding: 120px 0 80px;
    background: var(--bg-darker);
}

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

.about-page-content h1 {
    font-family: 'Montserrat', 'PingFang SC', sans-serif;
    font-size: 40px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
}

.about-page-content p {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.9;
    margin-bottom: 20px;
}

.about-page-image {
    background: var(--gradient-card);
    border: 1px solid rgba(2, 136, 209, 0.12);
    border-radius: var(--radius-lg);
    padding: 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.about-page-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(2, 136, 209, 0.03) 40px, rgba(2, 136, 209, 0.03) 41px),
        repeating-linear-gradient(90deg, transparent, transparent 40px, rgba(2, 136, 209, 0.03) 40px, rgba(2, 136, 209, 0.03) 41px);
}

.about-page-image .big-icon {
    font-size: 100px;
    opacity: 0.2;
    position: relative;
    z-index: 1;
    color: var(--aurora-blue);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 28px 20px;
    background: var(--gradient-card);
    border: 1px solid rgba(2, 136, 209, 0.1);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.stat-item .number {
    font-family: 'Montserrat', sans-serif;
    font-size: 36px;
    font-weight: 800;
    color: var(--aurora-blue);
    display: block;
    margin-bottom: 8px;
}

.stat-item .label {
    font-size: 13px;
    color: var(--text-muted);
}

/* ===== 联系我们页面 ===== */
.contact-page-section {
    padding: 120px 0 80px;
    background: var(--bg-darker);
}

.contact-page-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1200px) {
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 1024px) {
    .hero-title {
        font-size: 44px;
    }

    .about-section .container {
        flex-direction: column;
        gap: 40px;
    }

    .about-visual {
        width: 100%;
    }

    .contact-section .container {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
        text-align: center;
    }

    .product-detail-body .container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .product-sidebar {
        position: static;
    }

    .product-sidebar nav {
        display: flex;
        gap: 4px;
        overflow-x: auto;
        padding: 6px;
    }

    .product-sidebar nav a {
        white-space: nowrap;
        margin-bottom: 0;
    }

    .product-sidebar .btn {
        margin-top: 16px;
    }

    .about-page-section .container,
    .contact-page-section .container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(235, 245, 251, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: 20px;
        flex-direction: column;
        gap: 8px;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid rgba(2, 136, 209, 0.1);
    }

    .nav.mobile-open {
        display: flex;
    }

    .nav a {
        padding: 12px 16px;
        border-radius: 8px;
    }

    .nav a:hover {
        background: rgba(2, 136, 209, 0.08);
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-desc {
        font-size: 15px;
    }

    .hero-btns {
        flex-direction: column;
        align-items: center;
    }

    .section-title {
        font-size: 26px;
    }

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

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

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

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

    .page-header h1 {
        font-size: 32px;
    }

    .product-detail-banner h1 {
        font-size: 28px;
    }

    .contact-form-card {
        padding: 32px 24px;
    }

    .modal-content {
        padding: 32px 24px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 24px;
    }

    .container {
        padding: 0 16px;
    }

    .product-card {
        padding: 28px 24px;
    }

    .product-highlights {
        gap: 8px;
    }
}

/* ===== 动画辅助类 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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