/* ============================================
   红外技术有限公司网站样式
   主题：专业红外技术、热成像、科技感
   主色调：深色背景 + 橙红色渐变
   设计特点：简洁、现代、科技感强
============================================ */

/* --- 1. 全局变量与基础样式 --- */
:root {
    /* 红外技术主题色 */
    --infrared-dark: #0a0e17;
    --infrared-darker: #050811;
    --infrared-primary: #ff3c00;
    --infrared-secondary: #ff6b35;
    --infrared-gradient: linear-gradient(135deg, var(--infrared-primary), var(--infrared-secondary));
    --infrared-glow: 0 0 15px rgba(255, 60, 0, 0.5);
    --infrared-light-glow: 0 0 8px rgba(255, 60, 0, 0.3);
    
    /* 辅助色 */
    --text-primary: #ffffff;
    --text-secondary: #b0b7c3;
    --text-muted: #8a919e;
    --border-color: rgba(255, 255, 255, 0.1);
    --card-bg: rgba(20, 25, 40, 0.7);
    --card-bg-hover: rgba(30, 35, 50, 0.8);
    --section-bg: rgba(10, 14, 23, 0.9);
    --section-alt: rgba(15, 20, 35, 0.9);
    
    /* 间距与圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 5px 15px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
    
    /* 动画速度 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--infrared-dark);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(255, 60, 0, 0.05) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(255, 107, 53, 0.05) 0%, transparent 20%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(255, 60, 0, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(255, 107, 53, 0.03) 0%, transparent 40%);
    z-index: -1;
    pointer-events: none;
}

main {
    flex: 1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

h1 {
    font-size: 3.5rem;
    background: var(--infrared-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
    width: 100%;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--infrared-gradient);
    border-radius: 2px;
    box-shadow: var(--infrared-glow);
}

h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

h4 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

a {
    color: var(--infrared-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--infrared-secondary);
}

section {
    padding: 100px 0;
    position: relative;
}

section:nth-of-type(even) {
    background-color: var(--section-alt);
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    background: var(--infrared-gradient);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1.1rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--infrared-glow);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.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 var(--transition-slow);
    z-index: -1;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(255, 60, 0, 0.4);
}

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

/* --- 2. 头部与导航 --- */
.main-header {
    background-color: rgba(10, 14, 23, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 60, 0, 0.1);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-normal);
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo::before {
    content: '';
    display: inline-block;
    width: 12px;
    height: 12px;
    background: var(--infrared-gradient);
    border-radius: 50%;
    margin-right: 10px;
    box-shadow: var(--infrared-light-glow);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
    }
    50% { 
        opacity: 0.6; 
        transform: scale(1.1);
    }
}

.main-nav ul {
    display: flex;
    list-style: none;
}

.main-nav ul li {
    margin-left: 30px;
    position: relative;
}

.main-nav ul li a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 1rem;
    padding: 8px 0;
    position: relative;
    transition: color var(--transition-fast);
}

.main-nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--infrared-gradient);
    transition: width var(--transition-normal);
    box-shadow: var(--infrared-light-glow);
}

.main-nav ul li a:hover {
    color: var(--text-primary);
}

.main-nav ul li a:hover::after,
.main-nav ul li a.active::after {
    width: 100%;
}

.main-nav ul li a.active {
    color: var(--infrared-primary);
}

.menu-toggle {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--text-primary);
    padding: 5px;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

.menu-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* --- 3. 英雄区域 --- */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

#hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 30% 30%, rgba(255, 60, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 70%, rgba(255, 107, 53, 0.1) 0%, transparent 50%);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

#hero h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    text-shadow: var(--infrared-light-glow);
}

#hero p {
    font-size: 1.3rem;
    max-width: 700px;
    margin: 0 auto 3rem;
    color: var(--text-secondary);
}

/* --- 4. 解决方案 --- */
#solutions {
    background-color: var(--section-bg);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.solution-card {
    background-color: var(--card-bg);
    padding: 35px 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
}

.solution-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--infrared-gradient);
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    background-color: var(--card-bg-hover);
    border-color: rgba(255, 60, 0, 0.2);
}

.solution-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: rgba(255, 60, 0, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border: 2px solid rgba(255, 60, 0, 0.3);
}

.solution-icon::before {
    font-size: 2.5rem;
}

.icon-cloud::before {
    content: '🌡️';
}

.icon-data::before {
    content: '📊';
}

.icon-ai::before {
    content: '🤖';
}

.icon-security::before {
    content: '🔒';
}

.icon-iot::before {
    content: '📡';
}

.icon-consult::before {
    content: '💡';
}

.solution-card h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 15px;
}

/* --- 5. 关于我们 --- */
#about .about-content {
    display: flex;
    align-items: center;
    gap: 60px;
}

.about-text {
    flex: 1;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.about-action {
    margin-top: 2.5rem;
}

.about-visual {
    flex: 1;
    height: 350px;
    background: linear-gradient(45deg, var(--infrared-dark), var(--infrared-darker));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 60, 0, 0.2);
}

.about-visual::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle, rgba(255, 60, 0, 0.1) 1px, transparent 1px),
        radial-gradient(circle, rgba(255, 107, 53, 0.05) 1px, transparent 1px);
    background-size: 30px 30px, 60px 60px;
    animation: move-grid 20s linear infinite;
    z-index: 1;
}

@keyframes move-grid {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(-50px, -50px) rotate(0.5deg); }
}

.about-visual span {
    font-size: 2rem;
    font-weight: 700;
    background: var(--infrared-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: var(--infrared-light-glow);
    z-index: 2;
    text-align: center;
    padding: 20px;
}

/* --- 6. 最新动态/资讯中心 --- */
#news, #content {
    position: relative;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.news-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
    height: 100%;
}

.news-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    background-color: var(--card-bg-hover);
    border-color: rgba(255, 60, 0, 0.2);
}

.news-cover {
    height: 200px;
    width: 100%;
    overflow: hidden;
    position: relative;
    background: linear-gradient(45deg, #1a1f30, #2a3045);
}

.news-card:nth-child(3n+1) .news-cover {
    background: linear-gradient(45deg, #0a0e17, #1a1f30);
}

.news-card:nth-child(3n+2) .news-cover {
    background: linear-gradient(45deg, #1a1f30, #2a3045);
}

.news-card:nth-child(3n+3) .news-cover {
    background: linear-gradient(45deg, #2a3045, #3a4055);
}

.news-cover::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 60%, rgba(10, 14, 23, 0.8) 100%);
    z-index: 1;
}

.news-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--transition-slow);
}

.news-card:hover .news-cover img {
    transform: scale(1.05);
}

.news-content {
    padding: 25px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.news-content h4 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    line-height: 1.4;
}

.news-content h4 a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.news-content h4 a:hover {
    color: var(--infrared-primary);
}

.news-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.news-meta span {
    display: inline-flex;
    align-items: center;
}

.news-meta a {
    color: var(--infrared-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.news-meta a:hover {
    color: var(--infrared-primary);
}

.news-content p {
    flex-grow: 1;
    margin-bottom: 20px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.read-more-link {
    text-decoration: none;
    color: var(--infrared-primary);
    font-weight: 600;
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    transition: all var(--transition-fast);
    margin-top: auto;
}

.read-more-link:hover {
    color: var(--infrared-secondary);
    transform: translateX(5px);
}

.read-more-link::after {
    content: '→';
    margin-left: 8px;
    transition: transform var(--transition-fast);
}

.read-more-link:hover::after {
    transform: translateX(5px);
}

/* --- 7. FAQ --- */
#faq {
    background-color: var(--section-bg);
}

.faq-accordion {
    max-width: 900px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.faq-item {
    background-color: var(--card-bg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-normal);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item:hover {
    background-color: rgba(30, 35, 50, 0.5);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    text-align: left;
    padding: 25px 30px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.faq-question:hover {
    color: var(--infrared-primary);
}

.faq-question::after {
    content: '+';
    font-size: 1.8rem;
    color: var(--infrared-primary);
    transition: transform var(--transition-normal);
    font-weight: 300;
    line-height: 1;
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-normal);
    padding: 0 30px;
}

.faq-item.active .faq-answer {
    padding: 0 30px 25px;
}

.faq-answer p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 60, 0, 0.2);
}

/* --- 8. 分页 --- */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-top: 60px;
}

.page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-normal);
    font-weight: 600;
    background-color: rgba(30, 35, 50, 0.5);
}

.page-btn:hover {
    background-color: var(--infrared-primary);
    color: white;
    border-color: var(--infrared-primary);
    box-shadow: var(--infrared-glow);
    transform: translateY(-2px);
}

.page-current {
    display: inline-flex;
    align-items: center;
    height: 45px;
    padding: 0 20px;
    font-weight: 600;
    color: var(--text-primary);
    background-color: rgba(255, 60, 0, 0.1);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 60, 0, 0.2);
}

/* --- 9. 单篇文章/页面样式 --- */
.breadcrumb {
    padding: 20px 0;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--infrared-primary);
}

.breadcrumb span {
    margin: 0 12px;
    color: var(--text-muted);
}

.page-container {
    padding: 120px 0 100px;
}

.page-header {
    margin-bottom: 50px;
    text-align: center;
}

.page-header h1 {
    font-size: 2.8rem;
    margin-bottom: 15px;
    color: var(--text-primary);
    background: none;
    -webkit-text-fill-color: initial;
}

.page-meta {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 15px;
}

.page-meta a {
    color: var(--infrared-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.page-meta a:hover {
    color: var(--infrared-primary);
}

.markdown-body {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
    max-width: 100%;
    overflow-x: hidden;
}

.markdown-body h2 {
    font-size: 2rem;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    text-align: left;
    color: var(--text-primary);
    background: none;
    -webkit-text-fill-color: initial;
}

.markdown-body h2::after {
    display: none;
}

.markdown-body h3 {
    font-size: 1.6rem;
    margin-top: 2.5rem;
    margin-bottom: 1.2rem;
    color: var(--text-primary);
}

.markdown-body p {
    margin-bottom: 1.8rem;
}

.markdown-body ul, .markdown-body ol {
    padding-left: 25px;
    margin-bottom: 1.8rem;
}

.markdown-body li {
    margin-bottom: 0.8rem;
}

.markdown-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 25px 0;
    box-shadow: var(--shadow-md);
}

.markdown-body blockquote {
    border-left: 4px solid var(--infrared-primary);
    background-color: rgba(255, 60, 0, 0.05);
    padding: 25px;
    margin: 30px 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

.markdown-body a {
    color: var(--infrared-primary);
    text-decoration: none;
    border-bottom: 1px dashed var(--infrared-primary);
    transition: all var(--transition-fast);
}

.markdown-body a:hover {
    border-bottom-style: solid;
    color: var(--infrared-secondary);
}

.markdown-body hr {
    border: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--infrared-primary), transparent);
    margin: 40px 0;
}

.markdown-body pre {
    background: rgba(20, 25, 40, 0.8);
    color: var(--text-primary);
    padding: 25px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: 25px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-family: 'Consolas', 'Monaco', monospace;
}

.post-tags {
    margin-top: 50px;
    padding-top: 25px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.tag-pill {
    display: inline-block;
    background: rgba(255, 60, 0, 0.1);
    padding: 8px 18px;
    border-radius: 30px;
    color: var(--infrared-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    margin-right: 12px;
    margin-bottom: 12px;
    border: 1px solid rgba(255, 60, 0, 0.2);
    transition: all var(--transition-normal);
}

.tag-pill:hover {
    background: var(--infrared-gradient);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: var(--infrared-glow);
}

.post-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-next, .nav-prev {
    max-width: 45%;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    padding: 15px;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    background-color: rgba(30, 35, 50, 0.5);
}

.nav-next:hover, .nav-prev:hover {
    color: var(--infrared-primary);
    background-color: rgba(255, 60, 0, 0.1);
    transform: translateY(-3px);
}

.nav-next span, .nav-prev span {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: normal;
    margin-bottom: 8px;
}

/* --- 10. 错误页面 --- */
.error-page {
    text-align: center;
    padding: 120px 0;
}

.error-page h1 {
    font-size: 8rem;
    margin-bottom: 0;
    line-height: 1;
    background: var(--infrared-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(255, 60, 0, 0.5);
}

.error-page p {
    font-size: 1.8rem;
    margin-bottom: 40px;
    color: var(--text-secondary);
}

.no-content {
    text-align: center;
    padding: 60px;
    color: var(--text-muted);
    background-color: rgba(30, 35, 50, 0.5);
    border-radius: var(--radius-lg);
    border: 1px dashed rgba(255, 255, 255, 0.1);
    font-size: 1.2rem;
    grid-column: 1 / -1;
}

/* --- 11. 页脚 --- */
.main-footer {
    background-color: var(--infrared-darker);
    color: var(--text-secondary);
    padding: 80px 0 30px;
    margin-top: auto;
    border-top: 1px solid rgba(255, 60, 0, 0.1);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 50px;
}

.footer-column {
    flex: 1;
    min-width: 200px;
}

.footer-column h4 {
    color: var(--text-primary);
    margin-bottom: 25px;
    font-size: 1.3rem;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--infrared-gradient);
    border-radius: 2px;
}

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

.footer-column ul li {
    margin-bottom: 15px;
}

.footer-column ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
}

.footer-column ul li a::before {
    content: '›';
    margin-right: 10px;
    color: var(--infrared-primary);
    transition: transform var(--transition-fast);
}

.footer-column ul li a:hover {
    color: var(--text-primary);
    transform: translateX(5px);
}

.footer-column ul li a:hover::before {
    transform: translateX(3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-bottom a {
    color: var(--infrared-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-bottom a:hover {
    color: var(--infrared-primary);
    text-decoration: underline;
}

/* --- 12. 响应式设计 --- */
@media (max-width: 1200px) {
    h1 { font-size: 3.2rem; }
    h2 { font-size: 2.2rem; }
    #hero h1 { font-size: 3.5rem; }
    .container { padding: 0 30px; }
}

@media (max-width: 992px) {
    h1 { font-size: 2.8rem; }
    h2 { font-size: 2rem; }
    #hero h1 { font-size: 3rem; }
    #hero p { font-size: 1.2rem; }
    .about-content { flex-direction: column; }
    .about-visual { 
        order: -1; 
        margin-bottom: 40px;
        height: 300px;
    }
    .footer-content { flex-direction: column; gap: 50px; }
    section { padding: 80px 0; }
}

@media (max-width: 768px) {
    .logo { font-size: 1.5rem; }
    
    .menu-toggle {
        display: block;
    }
    
    .main-nav {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: rgba(10, 14, 23, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-normal);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
        z-index: 999;
    }
    
    .main-nav.active {
        max-height: 500px;
        border-top: 1px solid rgba(255, 60, 0, 0.1);
    }
    
    .main-nav ul {
        flex-direction: column;
        padding: 20px 0;
    }
    
    .main-nav ul li {
        margin: 0;
        text-align: center;
        width: 100%;
    }
    
    .main-nav ul li a {
        display: block;
        padding: 15px 20px;
        font-size: 1.1rem;
    }
    
    .main-nav ul li a::after {
        display: none;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.8rem; }
    #hero h1 { font-size: 2.5rem; }
    #hero p { font-size: 1.1rem; }
    #hero { min-height: 90vh; }
    .solutions-grid { grid-template-columns: 1fr; }
    .news-grid { grid-template-columns: 1fr; }
    .post-navigation { flex-direction: column; gap: 20px; }
    .nav-next, .nav-prev { max-width: 100%; }
    .page-header h1 { font-size: 2.2rem; }
    .page-container { padding: 100px 0 80px; }
}

@media (max-width: 576px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.6rem; }
    #hero h1 { font-size: 2.2rem; }
    #hero p { font-size: 1rem; }
    .btn { 
        padding: 12px 25px; 
        font-size: 1rem; 
        width: 100%;
        text-align: center;
    }
    .container { padding: 0 15px; }
    section { padding: 60px 0; }
    .solution-card, .news-content { padding: 20px; }
    .faq-question { 
        padding: 20px; 
        font-size: 1.1rem; 
    }
    .error-page h1 { font-size: 6rem; }
    .error-page p { font-size: 1.5rem; }
    .footer-column { min-width: 100%; }
    .page-header h1 { font-size: 1.8rem; }
    .pagination { flex-wrap: wrap; }
}