/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS变量定义 - Apple风格 */
:root {
    /* 主色调 - 简约的黑白灰 */
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #fbfbfd;
    
    /* 强调色 - 克制使用 */
    --accent-color: #0071e3;
    --accent-hover: #0051d5;
    --accent-light: #e8f2ff;
    
    /* 边框和分割线 */
    --border-color: #d2d2d7;
    --border-light: #f0f0f2;
    
    /* 阴影 - 极其微妙 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    
    /* 圆角 - 现代化 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    /* 动画时间 */
    --transition-fast: 0.2s;
    --transition-base: 0.3s;
    --transition-slow: 0.5s;
}

/* 黑暗模式 */
body.dark-mode {
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #86868b;
    --bg-primary: #000000;
    --bg-secondary: #1d1d1f;
    --bg-tertiary: #2d2d2d;
    --border-color: #424245;
    --border-light: #38383a;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

/* 基础样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    font-size: 17px;
    line-height: 1.47059;
    font-weight: 400;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* 容器 */
.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 48px;
}

@media (max-width: 1068px) {
    .container {
        padding: 0 32px;
    }
}

@media (max-width: 734px) {
    .container {
        padding: 0 20px;
    }
}

/* 导航栏 - Apple风格 */
.navbar {
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 9999;
    transition: all var(--transition-base);
    border-bottom: 1px solid var(--border-light);
}

body.dark-mode .navbar {
    background: rgba(0, 0, 0, 0.8);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 48px;
    padding: 0 22px;
    max-width: 100%;
}

.nav-brand a {
    font-size: 21px;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: 0.23px;
    transition: opacity var(--transition-fast);
}

.nav-brand a:hover {
    opacity: 0.8;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

.nav-toggle:hover {
    background-color: var(--bg-secondary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 36px;
    align-items: center;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle,
.lang-toggle {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover,
.lang-toggle:hover {
    background: var(--border-color);
    transform: scale(1.05);
}

.lang-text {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.nav-link {
    font-size: 14px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 400;
    letter-spacing: -0.016em;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--accent-color);
}

.nav-link.active {
    color: var(--accent-color);
}

/* 英雄区域 - Apple风格 */
.hero {
    background: var(--bg-primary);
    padding: 48px 0 88px;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-light);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    z-index: 1;
}

#heroCanvas {
    width: 100%;
    height: 100%;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
    margin: 0 auto;
}

.hero-title {
    font-size: 56px;
    line-height: 1.07143;
    font-weight: 700;
    letter-spacing: -0.005em;
    color: var(--text-primary);
    margin-bottom: 24px;
    animation: fadeIn 1s ease-out;
}

@media (max-width: 1068px) {
    .hero-title {
        font-size: 48px;
    }
}

@media (max-width: 734px) {
    .hero-title {
        font-size: 40px;
    }
}

.hero-subtitle {
    font-size: 28px;
    line-height: 1.14286;
    font-weight: 600;
    letter-spacing: 0.007em;
    color: var(--text-primary);
    margin-bottom: 16px;
    animation: fadeIn 1s ease-out 0.2s;
    animation-fill-mode: both;
}

@media (max-width: 734px) {
    .hero-subtitle {
        font-size: 24px;
    }
}

.hero-description {
    font-size: 21px;
    line-height: 1.38105;
    font-weight: 400;
    letter-spacing: 0.011em;
    color: var(--text-secondary);
    margin-bottom: 40px;
    animation: fadeIn 1s ease-out 0.4s;
    animation-fill-mode: both;
}

@media (max-width: 734px) {
    .hero-description {
        font-size: 19px;
    }
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeIn 1s ease-out 0.6s;
    animation-fill-mode: both;
}

/* 按钮样式 - Apple风格 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 980px;
    font-size: 17px;
    font-weight: 400;
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    min-width: 148px;
    height: 48px;
    letter-spacing: -0.022em;
    gap: 8px;
}

.btn-primary {
    background: var(--accent-color);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-outline {
    background: transparent;
    color: var(--accent-color);
    box-shadow: inset 0 0 0 1px var(--accent-color);
}

.btn-outline:hover {
    background: var(--accent-color);
    color: white;
}

/* 区块标题 - Apple风格 */
.section-title {
    font-size: 40px;
    line-height: 1.1;
    font-weight: 600;
    letter-spacing: -0.003em;
    text-align: center;
    margin-bottom: 48px;
    color: var(--text-primary);
}

@media (max-width: 734px) {
    .section-title {
        font-size: 32px;
        margin-bottom: 32px;
    }
}

/* 关于我们 */
.about {
    padding: 80px 0;
    /*background: var(--bg-primary);*/
    border-bottom: 1px solid var(--border-light);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text {
    text-align: center;
}

.about-text p {
    font-size: 19px;
    line-height: 1.5;
    font-weight: 400;
    letter-spacing: 0.011em;
    color: var(--text-secondary);
    margin-bottom: 24px;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

/* 特性展示 - Apple风格 */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}

@media (max-width: 734px) {
    .features {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

.feature {
    text-align: center;
    transition: transform var(--transition-base);
}

.feature:hover {
    transform: translateY(-8px);
}

.feature i {
    font-size: 48px;
    color: var(--accent-color);
    margin-bottom: 24px;
    display: block;
}

.feature h3 {
    font-size: 24px;
    line-height: 1.16667;
    font-weight: 600;
    letter-spacing: 0.009em;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature p {
    font-size: 17px;
    line-height: 1.47059;
    color: var(--text-secondary);
}

/* 服务项目 - Apple风格 */
.services {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

@media (max-width: 1068px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 734px) {
    .services-grid {
        grid-template-columns: 1fr;
    }
}

.service-card {
    background: var(--bg-primary);
    padding: 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 280px;
}

.service-card:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    font-size: 56px;
    color: var(--accent-color);
    margin-bottom: 16px;
    display: block;
    transition: all var(--transition-base);
    transform-origin: center;
    aspect-ratio: 1;
    width: auto;
    height: auto;
}

/* PC端图标放大效果 */
@media (min-width: 735px) {
    .service-card:hover .service-icon {
        transform: scale(1.15);
        color: var(--accent-hover);
    }
    
    /* 确保图标在放大时保持合适比例 */
    .service-icon {
        font-size: 64px;
        margin-bottom: 20px;
    }
}

@media (max-width: 734px) {
    .service-icon {
        font-size: 48px;
        margin-bottom: 12px;
    }
}

.service-card h3 {
    font-size: 22px;
    line-height: 1.2;
    font-weight: 600;
    letter-spacing: 0.007em;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.service-card p {
    font-size: 15px;
    line-height: 1.4;
    color: var(--text-secondary);
    margin-bottom: 16px;
    flex-grow: 1;
}

/* Details 样式简化 */
.service-card details {
    text-align: left;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.service-card summary {
    font-size: 16px;
    font-weight: 600;
    color: var(--accent-color);
    cursor: pointer;
    padding: 6px 0;
    transition: color var(--transition-fast);
    list-style: none;
}

.service-card summary::-webkit-details-marker {
    display: none;
}

.service-card summary::before {
    content: '+';
    font-size: 20px;
    margin-right: 8px;
    display: inline-block;
    transition: transform var(--transition-fast);
}

.service-card details[open] summary::before {
    transform: rotate(45deg);
}

.service-card summary:hover {
    color: var(--accent-hover);
}

.service-card details ul {
    list-style: none;
    margin-top: 12px;
}

.service-card details li {
    font-size: 15px;
    line-height: 1.4;
    color: var(--text-secondary);
    padding: 3px 0;
}

/* 统计数据 - Apple风格 */
.stats {
    padding: 80px 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-light);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 48px;
    text-align: center;
}

@media (max-width: 734px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }
}

.stat-item {
    transition: transform var(--transition-base);
}

.stat-item:hover {
    transform: scale(1.05);
}

.stat-item i {
    font-size: 40px;
    color: var(--accent-color);
    margin-bottom: 16px;
    display: block;
}

.stat-item h3 {
    font-size: 48px;
    line-height: 1;
    font-weight: 600;
    letter-spacing: -0.005em;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-item p {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* 联系我们 - 重新设计 */
.contact {
    padding: 60px 0;
    /*background: var(--bg-secondary);*/
}

/* 联系信息网格 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

@media (max-width: 1068px) {
    .contact-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 734px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

.contact-card {
    background: var(--bg-primary);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--border-light);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    width: 56px;
    height: 56px;
    background: var(--accent-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    transition: all var(--transition-base);
}

.contact-card:hover .contact-icon {
    background: var(--accent-color);
    transform: scale(1.1);
}

.contact-card:hover .contact-icon i {
    color: white;
}

.contact-icon i {
    font-size: 24px;
    color: var(--accent-color);
    transition: color var(--transition-base);
}

.contact-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.contact-card p {
    font-size: 15px;
    line-height: 1.5;
    color: var(--text-secondary);
}

.contact-card a {
    color: var(--accent-color);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.contact-card a:hover {
    opacity: 0.8;
}

/* 快速联系 */
.quick-contact {
    text-align: center;
    padding: 48px;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
}

.quick-contact h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.quick-contact p {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.contact-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

@media (max-width: 734px) {
    .contact-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-actions .btn {
        width: 100%;
        max-width: 280px;
    }
}

/* 页脚 - Apple风格 */
.footer {
    background: var(--bg-tertiary);
    padding: 60px 0 32px;
    border-top: 1px solid var(--border-light);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 80px;
    margin-bottom: 48px;
}

@media (max-width: 734px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }
}

.footer-section h3,
.footer-section h4 {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-section p {
    font-size: 17px;
    line-height: 1.47059;
    color: var(--text-secondary);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section a {
    font-size: 17px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.social-links {
    display: flex;
    gap: 16px;
    margin-top: 20px;
}

@media (max-width: 734px) {
    .social-links {
        justify-content: center;
    }
}

.social-links a {
    width: 44px;
    height: 44px;
    background: var(--bg-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--accent-color);
    color: white;
    transform: scale(1.1);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-light);
    font-size: 14px;
    color: var(--text-tertiary);
}

.footer-bottom a {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-bottom a:hover {
    color: var(--text-secondary);
}

/* 备案号样式 */
.beian-links {
    margin-top: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.beian-links a {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-size: 14px;
}

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

.beian-links .separator {
    color: var(--text-tertiary);
    font-size: 14px;
}

/* 返回顶部按钮 - Apple风格 */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top:hover {
    background: rgba(0, 0, 0, 0.9);
    transform: scale(1.1);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top i {
    font-size: 20px;
}

/* 加载动画 - Apple风格 */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity var(--transition-slow);
}

.loading.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border-light);
    border-top: 2px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 滚动动画类 */
.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* 防止闪烁 */
.feature,
.service-card,
.stat-item,
.contact-item {
    will-change: transform, opacity;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-perspective: 1000px;
    perspective: 1000px;
}

/* 响应式设计 */
@media (max-width: 734px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 48px;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        width: 100%;
        text-align: center;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-md);
        padding: 32px 0;
        gap: 20px;
    }
    
    body.dark-mode .nav-menu {
        background: rgba(0, 0, 0, 0.95);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-controls {
        position: fixed;
        top: 60px;
        right: 20px;
        background: var(--bg-primary);
        padding: 12px;
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-lg);
        border: 1px solid var(--border-light);
        display: flex;
        gap: 8px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .hero-buttons,
    .back-to-top,
    .loading,
    .nav-controls {
        display: none;
    }
    
    body {
        font-size: 12pt;
    }
    
    .hero {
        min-height: auto;
        padding: 40px 0;
    }
    
    section {
        padding: 40px 0;
    }
}