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

:root {
    --bg-primary: #0a0a1a;
    --bg-secondary: #1a1a2e;
    --bg-card: rgba(26, 26, 46, 0.75);
    --bg-glass: rgba(26, 26, 46, 0.55);
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0c0;
    --accent: #e94560;
    --accent-hover: #ff6b81;
    --accent-glow: rgba(233, 69, 96, 0.4);
    --border: rgba(255, 255, 255, 0.08);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    --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-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

/* ===== 跳转链接 ===== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 16px;
    padding: 12px 24px;
    background: var(--accent);
    color: #fff;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    z-index: 10000;
    font-weight: 600;
    text-decoration: none;
    transition: top 0.3s;
}
.skip-link:focus {
    top: 0;
}

/* ===== 导航栏 ===== */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(10, 10, 26, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: transform var(--transition);
}
.logo:hover {
    transform: scale(1.05);
}
.logo svg {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 6px;
    align-items: center;
}

.nav-links li a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
    position: relative;
    white-space: nowrap;
}

.nav-links li a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: all var(--transition);
    transform: translateX(-50%);
    border-radius: 2px;
}

.nav-links li a:hover {
    color: var(--text-primary);
    background: rgba(233, 69, 96, 0.1);
}
.nav-links li a:hover::after {
    width: 60%;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: background var(--transition);
}
.menu-toggle:hover {
    background: rgba(255,255,255,0.05);
}

/* ===== 首屏Hero ===== */
.hero {
    position: relative;
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(135deg, #0a0a1a 0%, #16213e 40%, #0f3460 70%, #1a1a2e 100%);
}

.hero svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.6;
    pointer-events: none;
}

.hero-text {
    position: relative;
    z-index: 2;
    max-width: 720px;
    text-align: center;
    padding: 40px 24px;
    animation: fadeInUp 0.8s ease-out;
}

.hero-text h1 {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn-primary {
    display: inline-block;
    padding: 14px 40px;
    background: linear-gradient(135deg, var(--accent), #c0392b);
    color: #fff;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition);
    box-shadow: 0 4px 20px var(--accent-glow);
    border: none;
    cursor: pointer;
}
.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 30px var(--accent-glow);
}

/* ===== 通用区块 ===== */
section {
    padding: 80px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

section h2 {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 700;
    margin-bottom: 48px;
    text-align: center;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
}

section h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 4px;
    margin: 12px auto 0;
}

/* ===== 品牌介绍 ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.about-grid article {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: all var(--transition);
    animation: fadeInUp 0.6s ease-out both;
}

.about-grid article:nth-child(2) { animation-delay: 0.1s; }
.about-grid article:nth-child(3) { animation-delay: 0.2s; }

.about-grid article:hover {
    transform: translateY(-6px);
    border-color: var(--accent);
    box-shadow: 0 12px 40px rgba(233, 69, 96, 0.15);
}

.about-grid h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.about-grid p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== 主营产品 ===== */
.products-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.products-list article {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: all var(--transition);
    animation: fadeInUp 0.6s ease-out both;
    position: relative;
    overflow: hidden;
}

.products-list article::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #ff6b81);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.products-list article:hover::before {
    transform: scaleX(1);
}

.products-list article:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.products-list h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    color: var(--accent);
}

.products-list p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== 解决方案 ===== */
#solutions article {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    margin-bottom: 24px;
    transition: all var(--transition);
    animation: fadeInUp 0.6s ease-out both;
}

#solutions article:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
}

#solutions h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

#solutions p {
    color: var(--text-secondary);
}

/* ===== 客户案例 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.cases-grid article {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: all var(--transition);
    animation: fadeInUp 0.6s ease-out both;
}

.cases-grid article:hover {
    transform: translateY(-6px) scale(1.01);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
    border-color: var(--accent);
}

.cases-grid h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.cases-grid p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== 客户评价 ===== */
#testimonials blockquote {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 32px;
    margin-bottom: 20px;
    border-left: 4px solid var(--accent);
    transition: all var(--transition);
    animation: fadeInUp 0.6s ease-out both;
    font-style: italic;
}

#testimonials blockquote:hover {
    transform: translateX(6px);
    border-left-color: var(--accent-hover);
}

#testimonials p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ===== 新闻中心 ===== */
.news-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.news-list article {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all var(--transition);
    animation: fadeInUp 0.6s ease-out both;
    display: flex;
    flex-direction: column;
}

.news-list article:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
    border-color: var(--accent);
}

.news-list h3 {
    font-size: 1.05rem;
    margin-bottom: 8px;
    color: var(--text-primary);
    line-height: 1.4;
}

.news-list time {
    display: block;
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 8px;
    font-weight: 500;
}

.news-list p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    flex: 1;
    margin-bottom: 12px;
}

.news-list a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: color var(--transition);
    align-self: flex-start;
}

.news-list a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ===== FAQ ===== */
.faq-list details {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
    transition: all var(--transition);
    animation: fadeInUp 0.5s ease-out both;
}

.faq-list details[open] {
    border-color: var(--accent);
    box-shadow: 0 4px 20px rgba(233, 69, 96, 0.1);
}

.faq-list summary {
    padding: 18px 24px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background var(--transition);
    user-select: none;
}

.faq-list summary::-webkit-details-marker {
    display: none;
}

.faq-list summary::after {
    content: '+';
    font-size: 1.3rem;
    color: var(--accent);
    transition: transform 0.3s;
    font-weight: 300;
}

.faq-list details[open] summary::after {
    content: '−';
    transform: rotate(180deg);
}

.faq-list summary:hover {
    background: rgba(233, 69, 96, 0.05);
}

.faq-list details p {
    padding: 0 24px 18px;
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.7;
}

/* ===== 使用教程 ===== */
#howto {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px 32px;
    animation: fadeInUp 0.6s ease-out;
}

#howto h2 {
    margin-bottom: 24px;
}

#howto p {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

#howto ol {
    padding-left: 24px;
    margin: 16px 0;
}

#howto ol li {
    margin-bottom: 10px;
    color: var(--text-secondary);
    line-height: 1.6;
}

#howto strong {
    color: var(--text-primary);
}

/* ===== 联系我们 ===== */
#contact address {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    font-style: normal;
    animation: fadeInUp 0.6s ease-out;
}

#contact p {
    margin-bottom: 10px;
    color: var(--text-secondary);
}

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

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

/* ===== 网站地图 & 友情链接 ===== */
#sitemap ul, #friendship-links ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    animation: fadeInUp 0.6s ease-out;
}

#sitemap ul li a, #friendship-links ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 20px;
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.9rem;
    transition: all var(--transition);
    background: var(--bg-glass);
    backdrop-filter: blur(8px);
}

#sitemap ul li a:hover, #friendship-links ul li a:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: rgba(233, 69, 96, 0.1);
    transform: translateY(-2px);
}

/* ===== Footer ===== */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 48px 24px 32px;
    margin-top: 40px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-content p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

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

.footer-content a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.5rem;
    box-shadow: 0 4px 20px var(--accent-glow);
    transition: all var(--transition);
    z-index: 999;
    opacity: 0.9;
}

.back-to-top:hover {
    transform: translateY(-4px) scale(1.05);
    opacity: 1;
    box-shadow: 0 8px 30px var(--accent-glow);
}

/* ===== 隐藏区块（隐私/免责/服务条款） ===== */
#privacy, #disclaimer, #terms {
    display: none !important;
}

/* ===== 动画关键帧 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    section {
        padding: 60px 20px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 26, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px 20px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-120%);
        opacity: 0;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        pointer-events: none;
        max-height: 80vh;
        overflow-y: auto;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-links li a {
        padding: 14px 16px;
        font-size: 1rem;
        width: 100%;
        text-align: center;
    }

    .menu-toggle {
        display: block;
    }

    .hero {
        min-height: 70vh;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-text p {
        font-size: 0.95rem;
    }

    section h2 {
        font-size: 1.5rem;
        white-space: normal;
    }

    .about-grid,
    .products-list,
    .cases-grid,
    .news-list {
        grid-template-columns: 1fr;
    }

    #howto {
        padding: 28px 20px;
    }

    #sitemap ul, #friendship-links ul {
        flex-direction: column;
        align-items: center;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    section {
        padding: 40px 16px;
    }

    .nav-container {
        padding: 0 12px;
        height: 56px;
    }

    .hero-text {
        padding: 24px 16px;
    }

    .btn-primary {
        padding: 12px 32px;
        font-size: 0.9rem;
    }

    .about-grid article,
    .products-list article,
    .cases-grid article,
    .news-list article {
        padding: 20px;
    }
}

/* ===== 暗色模式（默认已暗，但添加额外支持） ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0a0a1a;
        --bg-secondary: #1a1a2e;
        --text-primary: #f0f0f0;
        --text-secondary: #a0a0c0;
    }
}

/* ===== 滚动动画支持（通用） ===== */
@media (prefers-reduced-motion: no-preference) {
    section {
        opacity: 0;
        animation: fadeInUp 0.7s ease-out forwards;
    }

    section:nth-child(2) { animation-delay: 0.1s; }
    section:nth-child(3) { animation-delay: 0.2s; }
    section:nth-child(4) { animation-delay: 0.3s; }
    section:nth-child(5) { animation-delay: 0.4s; }
    section:nth-child(6) { animation-delay: 0.5s; }
    section:nth-child(7) { animation-delay: 0.6s; }
    section:nth-child(8) { animation-delay: 0.7s; }
    section:nth-child(9) { animation-delay: 0.8s; }
    section:nth-child(10) { animation-delay: 0.9s; }
    section:nth-child(11) { animation-delay: 1.0s; }
    section:nth-child(12) { animation-delay: 1.1s; }
    section:nth-child(13) { animation-delay: 1.2s; }
}

/* ===== 移动端菜单交互 ===== */
.menu-toggle.active {
    color: var(--accent);
}