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

:root {
    --primary: #e94560;
    --primary-dark: #c73a52;
    --secondary: #0f3460;
    --secondary-light: #16213e;
    --bg: #f0f2f5;
    --bg-card: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.15);
    --text: #1a1a2e;
    --text-light: #555;
    --text-white: #ffffff;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --radius: 16px;
    --radius-sm: 8px;
    --transition: 0.3s ease;
    --border-glass: 1px solid rgba(255, 255, 255, 0.3);
}

/* 暗色模式变量 */
[data-theme="dark"] {
    --bg: #0d1117;
    --bg-card: #161b22;
    --bg-glass: rgba(22, 27, 34, 0.7);
    --text: #e6edf3;
    --text-light: #8b949e;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --border-glass: 1px solid rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background var(--transition), color var(--transition);
    overflow-x: hidden;
}

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

a:hover {
    color: var(--primary-dark);
}

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

ul {
    list-style: none;
}

h1, h2, h3, h4 {
    line-height: 1.2;
    font-weight: 700;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    margin-bottom: 1.5rem;
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
    margin-top: 8px;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

section {
    padding: 4rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* 滚动动画（通用） */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 按钮通用 */
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    text-align: center;
}

.btn-primary {
    background: var(--primary);
    color: var(--text-white);
    box-shadow: 0 4px 15px rgba(233, 69, 96, 0.4);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(233, 69, 96, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 2px solid var(--text);
}

.btn-secondary:hover {
    background: var(--text);
    color: var(--bg);
    transform: translateY(-2px);
}

/* 头部导航 */
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: var(--border-glass);
    transition: background var(--transition);
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
}

.logo {
    flex-shrink: 0;
    transition: transform var(--transition);
}

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

nav ul {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

nav ul li a {
    color: var(--text);
    font-weight: 500;
    position: relative;
    padding: 0.25rem 0;
    transition: color var(--transition);
}

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

nav ul li a:hover::after {
    width: 100%;
}

#darkModeToggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text);
    padding: 0.5rem;
    border-radius: 50%;
    transition: background var(--transition), color var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

#darkModeToggle:hover {
    background: var(--bg-glass);
}

/* Hero 区域 */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    padding-top: 6rem;
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 50%, var(--primary) 100%);
    color: var(--text-white);
    position: relative;
    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), transparent 60%);
    animation: heroGlow 10s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(10%, 10%) scale(1.2); }
}

.hero-content, .hero-visual {
    position: relative;
    z-index: 1;
    flex: 1 1 400px;
    text-align: center;
}

.hero-content h1 {
    color: var(--text-white);
    margin-bottom: 1rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero-content p {
    color: rgba(255,255,255,0.85);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-visual svg {
    width: 100%;
    max-width: 400px;
    height: auto;
    filter: drop-shadow(0 10px 30px rgba(0,0,0,0.3));
    animation: float 6s ease-in-out infinite;
}

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

/* 关于我们 */
#about {
    background: var(--bg-card);
    border-radius: var(--radius);
    margin: 2rem auto;
    box-shadow: var(--shadow);
    padding: 3rem 2rem;
    transition: background var(--transition), box-shadow var(--transition);
}

.team-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.team-member {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg);
    border-radius: var(--radius);
    transition: transform var(--transition), box-shadow var(--transition);
}

.team-member:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.team-member svg {
    margin: 0 auto 1rem;
    border-radius: 50%;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.team-member h3 {
    margin-bottom: 0.25rem;
}

.team-member p {
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

/* 产品 */
#products {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    transition: background var(--transition);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.product-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
    backdrop-filter: blur(10px);
    border: var(--border-glass);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.15);
}

.product-card svg {
    margin: 0 auto 1rem;
}

.product-card h3 {
    margin-bottom: 0.75rem;
}

/* 服务 */
#services {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    box-shadow: var(--shadow);
    transition: background var(--transition);
}

#services ul {
    display: grid;
    gap: 1rem;
}

#services ul li {
    background: var(--bg);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary);
    transition: transform var(--transition), background var(--transition);
}

#services ul li:hover {
    transform: translateX(5px);
    background: var(--bg-glass);
}

/* 特色 */
#features {
    background: linear-gradient(135deg, var(--secondary-light), var(--secondary));
    border-radius: var(--radius);
    padding: 3rem 2rem;
    color: var(--text-white);
}

#features h2 {
    color: var(--text-white);
}

#features h2::after {
    background: var(--primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.feature-item {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 2rem 1.5rem;
    text-align: center;
    border: var(--border-glass);
    transition: transform var(--transition), background var(--transition);
}

.feature-item:hover {
    transform: translateY(-5px);
    background: rgba(255,255,255,0.2);
}

.feature-item svg {
    margin: 0 auto 1rem;
}

.feature-item h3 {
    color: var(--text-white);
    margin-bottom: 0.5rem;
}

.feature-item p {
    color: rgba(255,255,255,0.8);
    font-size: 0.95rem;
}

/* 用户评价 */
#testimonials {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    box-shadow: var(--shadow);
    transition: background var(--transition);
}

blockquote {
    background: var(--bg);
    padding: 1.5rem 2rem;
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
    margin-bottom: 1rem;
    font-style: italic;
    transition: transform var(--transition), background var(--transition);
}

blockquote:hover {
    transform: scale(1.01);
    background: var(--bg-glass);
}

blockquote p {
    margin: 0;
    color: var(--text);
}

/* FAQ */
#faq {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    transition: background var(--transition);
}

details {
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: background var(--transition), box-shadow var(--transition);
    border: 1px solid transparent;
}

details:hover {
    border-color: var(--primary);
    box-shadow: 0 2px 10px rgba(233,69,96,0.1);
}

details[open] {
    background: var(--bg-glass);
    border-color: var(--primary);
}

summary {
    font-weight: 600;
    font-size: 1.05rem;
    outline: none;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary);
    transition: transform var(--transition);
}

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

details p {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-glass);
    color: var(--text-light);
}

/* 联系我们 */
#contact {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    box-shadow: var(--shadow);
    transition: background var(--transition);
}

address {
    font-style: normal;
    line-height: 2;
}

address a {
    font-weight: 500;
}

/* 下载区域 */
#download {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius);
    padding: 3rem 2rem;
    text-align: center;
    color: var(--text-white);
}

#download h2 {
    color: var(--text-white);
}

#download h2::after {
    background: var(--text-white);
}

#download p {
    color: rgba(255,255,255,0.9);
    margin-bottom: 2rem;
}

.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.download-buttons .btn-primary {
    background: var(--text-white);
    color: var(--primary);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.download-buttons .btn-primary:hover {
    background: #f0f2f5;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

/* 页脚 */
footer {
    background: var(--secondary);
    color: var(--text-white);
    padding: 3rem 1.5rem 1.5rem;
    margin-top: 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-content h3 {
    color: var(--text-white);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-content ul li {
    margin-bottom: 0.5rem;
}

.footer-content a {
    color: rgba(255,255,255,0.7);
    transition: color var(--transition);
}

.footer-content a:hover {
    color: var(--primary);
}

.footer-contact p {
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
}

.sitemap {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.sitemap a {
    color: rgba(255,255,255,0.6);
    font-size: 0.85rem;
    transition: color var(--transition);
}

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

/* 响应式 */
@media (max-width: 768px) {
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-glass);
        backdrop-filter: blur(20px);
        padding: 1rem;
        border-bottom: var(--border-glass);
    }

    nav ul.show {
        display: flex;
    }

    nav ul li {
        text-align: center;
    }

    #hero {
        flex-direction: column;
        text-align: center;
        padding-top: 5rem;
    }

    .hero-visual svg {
        max-width: 300px;
    }

    section {
        padding: 2rem 1rem;
    }

    .team-highlights, .product-grid, .features-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .sitemap {
        gap: 0.75rem;
    }
}

/* 移动端菜单按钮（简易） */
#header .menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

@media (max-width: 768px) {
    #header .menu-toggle {
        display: block;
    }
}

/* 暗色模式按钮图标切换 */
[data-theme="dark"] #darkModeToggle svg circle {
    fill: #f0c040;
}

[data-theme="dark"] #darkModeToggle svg path {
    stroke: #f0c040;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

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

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

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

/* 选中文本样式 */
::selection {
    background: var(--primary);
    color: var(--text-white);
}

/* 辅助功能 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* 毛玻璃效果增强 */
.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: var(--border-glass);
    border-radius: var(--radius);
    transition: background var(--transition);
}