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

:root {
    /* 明亮模式 */
    --bg-primary: #ffffff;
    --bg-secondary: #f0f4ff;
    --bg-card: rgba(255, 255, 255, 0.75);
    --bg-glass: rgba(255, 255, 255, 0.25);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #7a7a9a;
    --accent: #6c63ff;
    --accent-hover: #5a52e0;
    --accent-gradient: linear-gradient(135deg, #6c63ff, #3b82f6);
    --border-color: rgba(108, 99, 255, 0.15);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.1);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --header-height: 70px;
}

body.dark-mode {
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a3e;
    --bg-card: rgba(30, 30, 60, 0.8);
    --bg-glass: rgba(30, 30, 60, 0.35);
    --text-primary: #e0e0ff;
    --text-secondary: #b0b0d0;
    --text-muted: #8080a0;
    --accent: #8b83ff;
    --accent-hover: #7a72ee;
    --accent-gradient: linear-gradient(135deg, #8b83ff, #5b8def);
    --border-color: rgba(139, 131, 255, 0.2);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.4);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.5);
}

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

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

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

a:hover {
    color: var(--accent-hover);
}

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

ul, ol {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    font-weight: 700;
}

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

/* ===== 渐变背景装饰 ===== */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, rgba(108,99,255,0.03) 0%, transparent 60%),
                radial-gradient(circle at 70% 80%, rgba(59,130,246,0.03) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

/* ===== Header ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background var(--transition), border-color var(--transition);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo a {
    display: flex;
    align-items: center;
}

.logo img {
    width: 120px;
    height: auto;
    transition: transform var(--transition);
}

.logo img:hover {
    transform: scale(1.05);
}

nav ul {
    display: flex;
    gap: 8px;
}

nav ul li a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition);
    position: relative;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: var(--accent-gradient);
    border-radius: 2px;
    transition: transform var(--transition);
}

nav ul li a:hover {
    color: var(--accent);
    background: rgba(108,99,255,0.08);
}

nav ul li a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.search-box {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 4px 4px 4px 16px;
    backdrop-filter: blur(10px);
    transition: all var(--transition);
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(108,99,255,0.15);
}

.search-box input {
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    width: 140px;
    padding: 6px 0;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box button {
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    border-radius: var(--radius-xl);
    padding: 6px 16px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition);
    font-weight: 600;
}

.search-box button:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(108,99,255,0.3);
}

.dark-mode-toggle, .menu-toggle {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
}

.dark-mode-toggle:hover, .menu-toggle:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    transform: rotate(15deg);
}

.menu-toggle {
    display: none;
}

/* ===== Hero Banner ===== */
.hero-banner {
    position: relative;
    margin-top: var(--header-height);
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    padding: 60px 20px;
    background: var(--accent-gradient);
    overflow: hidden;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 40%, rgba(255,255,255,0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 60%, rgba(255,255,255,0.05) 0%, transparent 50%);
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(20px, -20px) rotate(3deg); }
}

.banner-content {
    position: relative;
    z-index: 2;
    max-width: 600px;
    color: #fff;
    animation: fadeInUp 1s ease-out;
}

.banner-content h1 {
    font-size: 3.2rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 20px rgba(0,0,0,0.15);
    line-height: 1.2;
}

.banner-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
    text-shadow: 0 1px 10px rgba(0,0,0,0.1);
}

.btn-primary {
    display: inline-block;
    background: #fff;
    color: var(--accent);
    padding: 14px 36px;
    border-radius: var(--radius-xl);
    font-weight: 700;
    font-size: 1rem;
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    transition: all var(--transition);
    border: 2px solid transparent;
}

.btn-primary:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 12px 40px rgba(0,0,0,0.2);
    border-color: #fff;
    background: transparent;
    color: #fff;
}

.banner-img {
    position: relative;
    z-index: 2;
    max-width: 500px;
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    animation: float 6s ease-in-out infinite;
    transition: transform var(--transition);
}

.banner-img:hover {
    transform: scale(1.03) rotate(1deg);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== 面包屑 ===== */
.breadcrumb {
    max-width: var(--max-width);
    margin: 20px auto;
    padding: 0 20px;
}

.breadcrumb ul {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.breadcrumb ul li:not(:last-child)::after {
    content: '›';
    margin-left: 8px;
    color: var(--text-muted);
}

.breadcrumb ul li a {
    color: var(--accent);
}

.breadcrumb ul li:last-child {
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== 通用 Section ===== */
section, aside {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 20px;
    animation: fadeInUp 0.8s ease-out both;
}

section:nth-child(even), aside:nth-child(even) {
    animation-delay: 0.1s;
}

section h2, aside h2, aside h3 {
    font-size: 2.2rem;
    margin-bottom: 30px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    display: inline-block;
}

section h2::after, aside h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--accent-gradient);
    border-radius: 4px;
    margin-top: 8px;
}

/* ===== 品牌介绍 ===== */
.brand-intro {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    margin: 20px auto;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
}

.brand-intro p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 900px;
    line-height: 1.8;
}

/* ===== 产品 / 案例 / 文章 卡片 ===== */
.products, .cases, .latest-articles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 30px;
    padding: 60px 20px;
}

.products h2, .cases h2, .latest-articles h2 {
    grid-column: 1 / -1;
}

.products article, .cases article, .latest-articles article {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.products article::before, .cases article::before, .latest-articles article::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.products article:hover::before, .cases article:hover::before, .latest-articles article:hover::before {
    transform: scaleX(1);
}

.products article:hover, .cases article:hover, .latest-articles article:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.products article h3, .cases article h3, .latest-articles article h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.products article p, .cases article p, .latest-articles article p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.product-img, .case-img, .article-img {
    border-radius: var(--radius-sm);
    margin-top: 16px;
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--transition);
}

.products article:hover .product-img,
.cases article:hover .case-img,
.latest-articles article:hover .article-img {
    transform: scale(1.03);
}

.latest-articles time {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* ===== 服务 / 优势 / 联系 ===== */
.services, .advantages, .contact, .howto, .faq {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 50px 40px;
    margin: 20px auto;
    box-shadow: var(--shadow-md);
}

.services p, .advantages p, .contact p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
}

.advantages ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.advantages ul li {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 20px;
    transition: all var(--transition);
    backdrop-filter: blur(8px);
}

.advantages ul li:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

.advantages ul li strong {
    display: block;
    color: var(--accent);
    margin-bottom: 6px;
    font-size: 1.1rem;
}

/* ===== FAQ ===== */
.faq {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.faq h2 {
    grid-column: 1 / -1;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 20px;
    transition: all var(--transition);
    cursor: pointer;
}

.faq-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

.faq-item h3 {
    font-size: 1.1rem;
    color: var(--accent);
    margin-bottom: 8px;
}

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

/* ===== HowTo ===== */
.howto ol {
    counter-reset: step;
    display: grid;
    gap: 16px;
}

.howto ol li {
    counter-increment: step;
    padding: 16px 20px 16px 50px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    position: relative;
    transition: all var(--transition);
}

.howto ol li::before {
    content: counter(step);
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    background: var(--accent-gradient);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
}

.howto ol li:hover {
    transform: translateX(6px);
    border-color: var(--accent);
}

/* ===== 联系 xingkong.app ===== */
.contact ul {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin: 20px 0;
}

.contact ul li {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px 20px;
    font-weight: 500;
    transition: all var(--transition);
}

.contact ul li:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* ===== Aside 模块 ===== */
aside {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    margin: 20px auto;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

aside:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

aside h3 {
    font-size: 1.3rem;
    margin-bottom: 16px;
    color: var(--accent);
}

aside p, aside ul li {
    color: var(--text-secondary);
    line-height: 1.7;
}

aside ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

aside ul li a {
    font-weight: 500;
}

/* ===== 热门推荐 ===== */
.hot-recommend ul {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hot-recommend ul li a {
    display: inline-block;
    padding: 8px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    font-weight: 500;
    transition: all var(--transition);
    backdrop-filter: blur(8px);
}

.hot-recommend ul li a:hover {
    background: var(--accent-gradient);
    color: #fff;
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108,99,255,0.3);
}

/* ===== Footer ===== */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 60px 20px 30px;
    margin-top: 40px;
    backdrop-filter: blur(10px);
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
}

.footer-inner h3 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--accent);
}

.footer-inner ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-inner ul li a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: all var(--transition);
}

.footer-inner ul li a:hover {
    color: var(--accent);
    padding-left: 4px;
}

.footer-qrcode img {
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    transition: transform var(--transition);
}

.footer-qrcode img:hover {
    transform: scale(1.05);
}

.footer-copyright {
    grid-column: 1 / -1;
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-copyright p {
    margin-bottom: 6px;
}

/* ===== 返回顶部 ===== */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 8px 25px rgba(108,99,255,0.3);
    transition: all var(--transition);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.9;
}

#back-to-top:hover {
    transform: translateY(-6px) scale(1.1);
    box-shadow: 0 12px 35px rgba(108,99,255,0.4);
    opacity: 1;
}

/* ===== 滚动动画（通用入场） ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero-banner {
        flex-direction: column;
        text-align: center;
        min-height: auto;
        padding: 80px 20px 40px;
    }

    .banner-content h1 {
        font-size: 2.5rem;
    }

    .banner-img {
        max-width: 400px;
    }

    .products, .cases, .latest-articles {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .header-inner {
        padding: 0 12px;
        gap: 10px;
    }

    nav ul {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: var(--bg-glass);
        backdrop-filter: blur(30px);
        -webkit-backdrop-filter: blur(30px);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
    }

    nav ul.active {
        display: flex;
    }

    nav ul li a {
        padding: 12px 16px;
        font-size: 1rem;
    }

    .menu-toggle {
        display: flex;
    }

    .search-box {
        flex: 1;
        max-width: 200px;
    }

    .search-box input {
        width: 100px;
    }

    .hero-banner {
        padding: 60px 16px 30px;
    }

    .banner-content h1 {
        font-size: 2rem;
    }

    .banner-content p {
        font-size: 1rem;
    }

    .btn-primary {
        padding: 12px 28px;
        font-size: 0.9rem;
    }

    .banner-img {
        max-width: 300px;
    }

    section, aside {
        padding: 40px 16px;
    }

    section h2, aside h2, aside h3 {
        font-size: 1.7rem;
    }

    .brand-intro {
        padding: 30px 20px;
    }

    .products, .cases, .latest-articles {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 40px 16px;
    }

    .services, .advantages, .contact, .howto, .faq {
        padding: 30px 20px;
    }

    .advantages ul {
        grid-template-columns: 1fr;
    }

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

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }

    .footer-qrcode {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

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

@media (max-width: 480px) {
    .banner-content h1 {
        font-size: 1.6rem;
    }

    .banner-img {
        max-width: 240px;
    }

    .search-box input {
        width: 80px;
    }

    .logo img {
        width: 90px;
    }
}

/* ===== 暗色模式微调 ===== */
body.dark-mode .bg-card,
body.dark-mode .faq-item,
body.dark-mode .howto ol li,
body.dark-mode .contact ul li,
body.dark-mode .advantages ul li,
body.dark-mode .hot-recommend ul li a {
    background: rgba(30, 30, 60, 0.6);
}

body.dark-mode .brand-intro {
    background: rgba(20, 20, 50, 0.6);
}

body.dark-mode .hero-banner {
    background: linear-gradient(135deg, #2a1b5e, #1a3a6e);
}

/* ===== 图片懒加载过渡 ===== */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.6s ease;
}

img[loading="lazy"].loaded {
    opacity: 1;
}