/* 全局变量与重置 */
:root {
    --primary: #2c3e50;
    --primary-light: #34495e;
    --primary-dark: #1a252f;
    --accent: #3498db;
    --accent-light: #5dade2;
    --accent-dark: #2980b9;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-border: rgba(255, 255, 255, 0.25);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --card-bg: #ffffff;
    --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    --card-radius: 16px;
    --text-primary: #2c3e50;
    --text-secondary: #5a6c7d;
    --bg-body: #f8f9fa;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* 暗色模式 */
@media (prefers-color-scheme: dark) {
    :root {
        --primary: #ecf0f1;
        --primary-light: #bdc3c7;
        --primary-dark: #95a5a6;
        --accent: #5dade2;
        --accent-light: #85c1e9;
        --accent-dark: #3498db;
        --glass-bg: rgba(30, 30, 30, 0.6);
        --glass-border: rgba(255, 255, 255, 0.1);
        --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        --card-bg: #2c3e50;
        --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
        --text-primary: #ecf0f1;
        --text-secondary: #bdc3c7;
        --bg-body: #1a1a2e;
    }
}

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

body {
    font-family: var(--font-family);
    background: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background 0.3s ease, color 0.3s ease;
}

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

a:hover {
    color: var(--accent-dark);
    text-decoration: underline;
}

/* 滚动动画基础 */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

/* 导航 */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.8rem 1.5rem;
}

nav a[aria-label="首页"] {
    flex-shrink: 0;
}

nav ul {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

nav ul li a {
    font-weight: 500;
    color: var(--text-primary);
    padding: 0.5rem 0.8rem;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
    transform: translateX(-50%);
}

nav ul li a:hover::after {
    width: 80%;
}

nav ul li a:hover {
    background: var(--glass-bg);
    color: var(--accent);
    text-decoration: none;
}

nav button {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
    color: var(--text-primary);
    background: var(--glass-bg);
    backdrop-filter: blur(5px);
}

nav button:hover {
    background: var(--accent);
    color: white;
    transform: scale(1.1);
}

/* Banner 轮播 */
section[aria-label="Banner轮播"] {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    background: var(--gradient-1);
    position: relative;
    min-height: 400px;
}

section[aria-label="Banner轮播"] > div {
    flex: 0 0 100%;
    scroll-snap-align: start;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 4rem 2rem;
    color: white;
    background: var(--gradient-1);
    background-size: 200% 200%;
    animation: gradientShift 8s ease infinite;
}

section[aria-label="Banner轮播"] > div:nth-child(2) {
    background: var(--gradient-2);
}

section[aria-label="Banner轮播"] > div:nth-child(3) {
    background: var(--gradient-3);
}

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

section[aria-label="Banner轮播"] h1,
section[aria-label="Banner轮播"] h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    animation: fadeInUp 0.8s ease;
}

section[aria-label="Banner轮播"] p {
    font-size: 1.2rem;
    max-width: 600px;
    margin-bottom: 2rem;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease 0.2s both;
}

section[aria-label="Banner轮播"] a {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: white;
    color: var(--primary);
    border-radius: 50px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    transition: var(--transition);
    animation: fadeInUp 0.8s ease 0.4s both;
}

section[aria-label="Banner轮播"] a:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
    text-decoration: none;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 面包屑 */
nav[aria-label="面包屑导航"] {
    max-width: 1200px;
    margin: 1rem auto;
    padding: 0 1.5rem;
}

nav[aria-label="面包屑导航"] ol {
    display: flex;
    gap: 0.5rem;
    list-style: none;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

nav[aria-label="面包屑导航"] ol li a {
    color: var(--accent);
}

nav[aria-label="面包屑导航"] ol li a:hover {
    text-decoration: underline;
}

/* 通用 section 样式 */
main > section {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 1.5rem;
    background: var(--card-bg);
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    padding: 2.5rem 2rem;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
}

main > section:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.15);
}

main > section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    position: relative;
    padding-bottom: 0.5rem;
}

main > section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
}

main > section p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

/* 产品卡片 */
#products article,
#solutions article,
#cases article {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--card-radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
    transition: var(--transition);
    box-shadow: var(--glass-shadow);
}

#products article:hover,
#solutions article:hover,
#cases article:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 12px 40px rgba(0,0,0,0.2);
    border-color: var(--accent);
}

#products article h3,
#solutions article h3,
#cases article h3 {
    color: var(--text-primary);
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
}

/* 行业应用列表 */
#industry ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    list-style: none;
    padding: 0;
}

#industry ul li {
    background: var(--glass-bg);
    backdrop-filter: blur(5px);
    padding: 1rem 1.2rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
    font-weight: 500;
    color: var(--text-primary);
}

#industry ul li:hover {
    transform: translateY(-3px);
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* 新闻卡片 */
#news article {
    background: var(--glass-bg);
    backdrop-filter: blur(5px);
    border: 1px solid var(--glass-border);
    border-radius: var(--card-radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
    transition: var(--transition);
}

#news article:hover {
    transform: translateX(5px);
    border-color: var(--accent);
}

#news article h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

#news article time {
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: block;
    margin-bottom: 0.5rem;
}

#news article a {
    display: inline-block;
    margin-top: 0.5rem;
    font-weight: 600;
}

/* FAQ 样式 */
#faq dl {
    display: grid;
    gap: 1.5rem;
}

#faq dt {
    font-weight: 600;
    color: var(--accent);
    cursor: pointer;
    padding: 0.8rem 1rem;
    background: var(--glass-bg);
    border-radius: 8px 8px 0 0;
    border-left: 3px solid var(--accent);
    transition: var(--transition);
}

#faq dt:hover {
    background: rgba(52, 152, 219, 0.1);
}

#faq dd {
    padding: 0 1rem 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    border-left: 3px solid var(--glass-border);
    margin-left: 0;
}

/* HowTo */
#howto ol {
    padding-left: 1.5rem;
    margin: 1rem 0;
}

#howto ol li {
    margin-bottom: 0.8rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* 联系我们 */
#contact p {
    margin-bottom: 0.5rem;
    font-size: 1.05rem;
}

/* 友情链接 & 网站地图 */
section[aria-labelledby="links-heading"] ul,
section[aria-labelledby="sitemap-heading"] ul {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    list-style: none;
    padding: 0;
}

section[aria-labelledby="links-heading"] ul li a,
section[aria-labelledby="sitemap-heading"] ul li a {
    padding: 0.4rem 1rem;
    background: var(--glass-bg);
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
    font-size: 0.9rem;
}

section[aria-labelledby="links-heading"] ul li a:hover,
section[aria-labelledby="sitemap-heading"] ul li a:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    text-decoration: none;
}

/* Footer */
footer {
    background: var(--primary-dark);
    color: white;
    text-align: center;
    padding: 2rem 1.5rem;
    margin-top: 3rem;
}

footer a {
    color: var(--accent-light);
}

footer a:hover {
    color: white;
}

footer p {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

/* 响应式布局 */
@media (max-width: 768px) {
    nav {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    nav ul {
        order: 3;
        flex: 1 1 100%;
        justify-content: center;
        gap: 0.5rem;
        flex-wrap: wrap;
    }

    nav ul li a {
        font-size: 0.9rem;
        padding: 0.3rem 0.6rem;
    }

    section[aria-label="Banner轮播"] h1,
    section[aria-label="Banner轮播"] h2 {
        font-size: 1.8rem;
    }

    section[aria-label="Banner轮播"] p {
        font-size: 1rem;
    }

    main > section {
        padding: 1.5rem 1rem;
        margin: 1.5rem auto;
        border-radius: 12px;
    }

    main > section h2 {
        font-size: 1.5rem;
    }

    #industry ul {
        grid-template-columns: 1fr 1fr;
    }

    #faq dl {
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    nav {
        padding: 0.5rem 1rem;
    }

    nav ul {
        gap: 0.3rem;
    }

    nav ul li a {
        font-size: 0.8rem;
        padding: 0.2rem 0.5rem;
    }

    section[aria-label="Banner轮播"] {
        min-height: 300px;
    }

    section[aria-label="Banner轮播"] > div {
        padding: 2rem 1rem;
    }

    section[aria-label="Banner轮播"] h1,
    section[aria-label="Banner轮播"] h2 {
        font-size: 1.4rem;
    }

    #industry ul {
        grid-template-columns: 1fr;
    }

    main > section {
        padding: 1rem;
    }
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-body);
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-dark);
}

/* 选中文字样式 */
::selection {
    background: var(--accent);
    color: white;
}

/* 打印样式 */
@media print {
    header, footer, nav[aria-label="面包屑导航"] {
        display: none;
    }
    body {
        background: white;
        color: black;
    }
    main > section {
        box-shadow: none;
        border: 1px solid #ddd;
        break-inside: avoid;
    }
}