/* 全局重置与基础样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #e94560;
    --primary-dark: #c73650;
    --secondary: #0f3460;
    --accent: #16213e;
    --bg-dark: #1a1a2e;
    --bg-card: rgba(255, 255, 255, 0.08);
    --bg-glass: rgba(255, 255, 255, 0.12);
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
    --border-glass: rgba(255, 255, 255, 0.18);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 0 20px rgba(233, 69, 96, 0.3);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 渐变Banner背景 */
#hero {
    position: relative;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #e94560 100%);
    background-size: 400% 400%;
    animation: gradientShift 12s ease infinite;
    padding: 6rem 2rem 5rem;
    text-align: center;
    border-radius: 0 0 var(--radius) var(--radius);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

#hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(233, 69, 96, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 30%, rgba(15, 52, 96, 0.2) 0%, transparent 50%);
    animation: heroGlow 8s ease-in-out infinite alternate;
    pointer-events: none;
}

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

@keyframes heroGlow {
    0% { transform: scale(1) rotate(0deg); opacity: 0.6; }
    100% { transform: scale(1.1) rotate(5deg); opacity: 1; }
}

/* 通用滚动动画 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 通用卡片样式 – 圆角 + 毛玻璃 */
.card, section > article, section > section > article, .faq-item {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 1.8rem;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.card:hover, section > article:hover, section > section > article:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-glow), var(--shadow-card);
    background: rgba(255, 255, 255, 0.12);
}

/* 头部导航 */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(26, 26, 46, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
    padding: 0 2rem;
}

nav[aria-label="主导航"] {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.8rem 0;
}

nav[aria-label="主导航"] > a {
    font-size: 1.6rem;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: 1px;
    transition: text-shadow var(--transition);
}

nav[aria-label="主导航"] > a:hover {
    text-shadow: 0 0 12px var(--primary);
}

nav[aria-label="主导航"] ul {
    list-style: none;
    display: flex;
    gap: 0.2rem;
    flex-wrap: wrap;
}

nav[aria-label="主导航"] ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: background var(--transition), color var(--transition);
    font-size: 0.95rem;
}

nav[aria-label="主导航"] ul li a:hover {
    background: rgba(233, 69, 96, 0.15);
    color: var(--text-primary);
}

/* Hero内容 */
#hero h1 {
    font-size: clamp(2.2rem, 6vw, 3.8rem);
    font-weight: 800;
    margin-bottom: 1rem;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    position: relative;
    z-index: 1;
}

#hero p {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 2rem;
    position: relative;
    z-index: 1;
}

#hero a {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    padding: 0.9rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05rem;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
    position: relative;
    z-index: 1;
}

#hero a:hover {
    background: var(--primary-dark);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 30px rgba(233, 69, 96, 0.6);
}

/* 主内容区域 */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* 通用section */
section {
    margin-bottom: 4rem;
    padding: 0.5rem 0;
}

section h2 {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    border-left: 4px solid var(--primary);
    padding-left: 1rem;
    position: relative;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 1rem;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), transparent);
    border-radius: 2px;
}

section p {
    color: var(--text-secondary);
    max-width: 800px;
    margin-bottom: 1rem;
}

/* 关于 – 毛玻璃卡片组 */
#about p {
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 1.2rem 1.5rem;
    margin-bottom: 1rem;
    transition: background var(--transition), transform var(--transition);
}

#about p:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateX(6px);
}

/* 核心服务列表 */
#services ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

#services ul li {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 1.8rem;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

#services ul li:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-glow), var(--shadow-card);
    background: rgba(255, 255, 255, 0.12);
}

#services ul li strong {
    display: block;
    color: var(--primary);
    font-size: 1.2rem;
    margin-bottom: 0.6rem;
}

/* 解决方案 – 文章卡片 */
#solutions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.8rem;
}

#solutions h2 {
    grid-column: 1 / -1;
}

#solutions article {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

#solutions article:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow), var(--shadow-card);
    background: rgba(255, 255, 255, 0.12);
}

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

/* 知识中心 */
#resources {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

#resources h2 {
    margin-bottom: 0.5rem;
}

#howto {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition), box-shadow var(--transition);
}

#howto:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow), var(--shadow-card);
}

#howto ol {
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

#howto ol li {
    margin-bottom: 0.6rem;
    line-height: 1.6;
}

#resources > section {
    background: transparent;
    border: none;
    padding: 0;
    box-shadow: none;
}

#resources > section > ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 2rem;
}

#resources > section > ul li a {
    display: inline-block;
    background: var(--bg-card);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid var(--border-glass);
    border-radius: 50px;
    padding: 0.5rem 1.4rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background var(--transition), color var(--transition), transform var(--transition);
}

#resources > section > ul li a:hover {
    background: rgba(233, 69, 96, 0.2);
    color: var(--text-primary);
    transform: translateY(-2px);
}

#resources > section > article {
    margin-bottom: 1.5rem;
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

#resources > section > article:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow), var(--shadow-card);
    background: rgba(255, 255, 255, 0.12);
}

#resources > section > article h4 {
    color: var(--primary);
    margin-bottom: 0.5rem;
}

/* FAQ – 定义列表毛玻璃 */
#faq dl {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

#faq dt {
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    padding: 1rem 1.5rem;
    font-weight: 600;
    color: var(--primary);
    cursor: pointer;
    transition: background var(--transition);
    position: relative;
}

#faq dt:hover {
    background: rgba(233, 69, 96, 0.15);
}

#faq dt::after {
    content: '▾';
    position: absolute;
    right: 1.5rem;
    transition: transform var(--transition);
}

#faq dt:hover::after {
    transform: rotate(180deg);
}

#faq dd {
    background: var(--bg-card);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid var(--border-glass);
    border-top: none;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    padding: 0.8rem 1.5rem 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

/* 联系我们 – 地址与表单 */
#contact {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

#contact h2 {
    grid-column: 1 / -1;
}

#contact address {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-card);
    font-style: normal;
}

#contact address p {
    margin-bottom: 0.8rem;
    color: var(--text-secondary);
}

#contact form {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#contact form label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

#contact form input,
#contact form textarea {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 0.8rem 1rem;
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 1rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

#contact form input:focus,
#contact form textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.2);
}

#contact form textarea {
    resize: vertical;
    min-height: 100px;
}

#contact form button {
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50px;
    padding: 0.9rem 2rem;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    align-self: flex-start;
    box-shadow: 0 4px 15px rgba(233, 69, 96, 0.3);
}

#contact form button:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(233, 69, 96, 0.5);
}

/* 页脚 */
footer {
    background: rgba(26, 26, 46, 0.9);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-top: 1px solid var(--border-glass);
    padding: 2rem 2rem 1.5rem;
    text-align: center;
}

footer nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

footer nav ul li a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition);
}

footer nav ul li a:hover {
    color: var(--primary);
}

footer p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* 响应式布局 */
@media (max-width: 900px) {
    #contact {
        grid-template-columns: 1fr;
    }
    
    #solutions {
        grid-template-columns: 1fr;
    }
    
    #services ul {
        grid-template-columns: 1fr;
    }
    
    #hero {
        padding: 4rem 1.5rem 3.5rem;
    }
}

@media (max-width: 768px) {
    header {
        padding: 0 1rem;
    }
    
    nav[aria-label="主导航"] {
        flex-direction: column;
        gap: 0.6rem;
        padding: 0.6rem 0;
    }
    
    nav[aria-label="主导航"] ul {
        justify-content: center;
    }
    
    nav[aria-label="主导航"] ul li a {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }
    
    main {
        padding: 1.5rem 1rem;
    }
    
    section {
        margin-bottom: 2.5rem;
    }
    
    #hero h1 {
        font-size: 2rem;
    }
    
    #hero p {
        font-size: 1rem;
    }
    
    #faq dl {
        grid-template-columns: 1fr;
    }
    
    #contact form {
        padding: 1.5rem;
    }
    
    #contact address {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    #hero {
        padding: 3rem 1rem 2.5rem;
    }
    
    #hero h1 {
        font-size: 1.7rem;
    }
    
    #hero a {
        padding: 0.7rem 1.8rem;
        font-size: 0.95rem;
    }
    
    .card, section > article, section > section > article {
        padding: 1.2rem;
    }
    
    #services ul li {
        padding: 1.2rem;
    }
    
    #solutions article {
        padding: 1.2rem;
    }
    
    #howto {
        padding: 1.2rem;
    }
    
    #resources > section > article {
        padding: 1rem;
    }
    
    footer {
        padding: 1.5rem 1rem 1rem;
    }
}

/* 暗色模式支持 – 默认已是暗色，强化细节 */
@media (prefers-color-scheme: light) {
    :root {
        --bg-dark: #f5f5f5;
        --bg-card: rgba(0, 0, 0, 0.04);
        --bg-glass: rgba(255, 255, 255, 0.7);
        --text-primary: #1a1a2e;
        --text-secondary: #444;
        --text-muted: #777;
        --border-glass: rgba(0, 0, 0, 0.1);
        --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.08);
        --shadow-glow: 0 0 20px rgba(233, 69, 96, 0.15);
    }
    
    header {
        background: rgba(245, 245, 245, 0.9);
    }
    
    #hero {
        background: linear-gradient(135deg, #f0f0f5 0%, #e8e8f0 40%, #d0d8e8 70%, #e94560 100%);
    }
    
    #hero h1 {
        text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    }
    
    #contact form input,
    #contact form textarea {
        background: rgba(0, 0, 0, 0.03);
        color: var(--text-primary);
    }
    
    footer {
        background: rgba(245, 245, 245, 0.9);
    }
}

/* 滚动动画应用 – 默认隐藏，通过JS添加visible类 */
section, article, #services ul li, #solutions article, #resources > section > article, #howto, #faq dl > div {
    animation: fadeInUp 0.7s ease forwards;
    opacity: 0;
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 为每个section设置不同的延迟 */
section:nth-child(1) { animation-delay: 0.1s; }
section:nth-child(2) { animation-delay: 0.2s; }
section:nth-child(3) { animation-delay: 0.3s; }
section:nth-child(4) { animation-delay: 0.4s; }
section:nth-child(5) { animation-delay: 0.5s; }
section:nth-child(6) { animation-delay: 0.6s; }
section:nth-child(7) { animation-delay: 0.7s; }

/* 确保所有内容可见（回退） */
body.loaded section,
body.loaded article,
body.loaded li,
body.loaded dt,
body.loaded dd {
    opacity: 1;
}