/* ========================================
   尧图北京网站建设 - 全局样式文件
   香水潮流风：亮粉 + 浅蓝 + 浅紫
   圆形与菱形模块组合布局
======================================== */

/* CSS 变量定义 */
:root {
    --color-pink-bright: #FF69B4;
    --color-pink-light: #FFB6C1;
    --color-blue-light: #B0E0E6;
    --color-purple-light: #D8BFD8;
    --color-purple-medium: #DDA0DD;
    --color-purple-dark: #9370DB;
    --color-white: #FFFFFF;
    --color-gray-light: #F5F5F5;
    --color-text-dark: #333333;
    --color-text-gray: #666666;
    --gradient-perfume: linear-gradient(135deg, #FF69B4 0%, #D8BFD8 50%, #B0E0E6 100%);
    --gradient-diamond: linear-gradient(45deg, #FFB6C1 0%, #E6E6FA 50%, #DDA0DD 100%);
    --shadow-soft: 0 8px 32px rgba(255, 105, 180, 0.15);
    --shadow-hover: 0 12px 48px rgba(255, 105, 180, 0.25);
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-circle: 50%;
    --border-radius-soft: 20px;
    --border-radius-diamond: 8px;
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.8;
    color: var(--color-text-dark);
    background: var(--color-gray-light);
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(255, 105, 180, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(180, 224, 230, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(216, 191, 216, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

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

ul, ol {
    list-style: none;
}

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

/* ========================================
   顶部导航栏 - 固定响应式
======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(255, 105, 180, 0.1);
    transition: var(--transition-smooth);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 32px rgba(255, 105, 180, 0.2);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

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

.logo img {
    height: 50px;
    width: auto;
    border-radius: var(--border-radius-soft);
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-perfume);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    display: block;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-dark);
    border-radius: 30px;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.nav-menu a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-perfume);
    opacity: 0;
    transition: var(--transition-smooth);
    border-radius: 30px;
    z-index: -1;
}

.nav-menu a:hover::before,
.nav-menu a.active::before {
    opacity: 0.15;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-pink-bright);
    transform: translateY(-2px);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--color-pink-bright);
    border-radius: 2px;
    transition: var(--transition-smooth);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ========================================
   页脚样式
======================================== */
.footer {
    background: linear-gradient(135deg, #2c2c2c 0%, #1a1a1a 100%);
    color: var(--color-white);
    padding: 60px 0 30px;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-perfume);
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--color-pink-light);
    position: relative;
    padding-bottom: 10px;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--gradient-perfume);
}

.footer-section p,
.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    line-height: 2;
    font-size: 14px;
}

.footer-section a:hover {
    color: var(--color-pink-bright);
    padding-left: 8px;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

/* ========================================
   首页 Banner - 全屏独特设计
======================================== */
.hero-banner {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--gradient-perfume);
}

.hero-bg-shapes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.shape-circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: float 20s infinite ease-in-out;
}

.shape-circle:nth-child(1) {
    width: 400px;
    height: 400px;
    top: 10%;
    left: 5%;
    animation-delay: 0s;
}

.shape-circle:nth-child(2) {
    width: 300px;
    height: 300px;
    top: 60%;
    right: 10%;
    animation-delay: 5s;
}

.shape-circle:nth-child(3) {
    width: 200px;
    height: 200px;
    bottom: 20%;
    left: 20%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    25% {
        transform: translate(30px, -30px) rotate(90deg);
    }
    50% {
        transform: translate(-20px, 20px) rotate(180deg);
    }
    75% {
        transform: translate(20px, 30px) rotate(270deg);
    }
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    color: var(--color-white);
    max-width: 900px;
    padding: 0 20px;
}

.hero-title {
    font-size: clamp(32px, 5vw, 64px);
    font-weight: 800;
    margin-bottom: 24px;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: clamp(18px, 2.5vw, 24px);
    margin-bottom: 40px;
    opacity: 0.95;
    animation: fadeInUp 1s ease-out 0.3s both;
}

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

.btn {
    display: inline-block;
    padding: 16px 40px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--color-white);
    color: var(--color-pink-bright);
    box-shadow: 0 8px 24px rgba(255, 255, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 36px rgba(255, 255, 255, 0.4);
}

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

.btn-secondary:hover {
    background: var(--color-white);
    color: var(--color-pink-bright);
    transform: translateY(-4px);
}

/* ========================================
   圆形与菱形组合布局 - 核心优势
======================================== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--gradient-perfume);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 18px;
    color: var(--color-text-gray);
    max-width: 600px;
    margin: 0 auto;
}

/* 独特圆形布局 */
.circle-layout {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 40px;
}

.circle-center {
    position: relative;
    width: 280px;
    height: 280px;
    margin: 0 auto 60px;
    border-radius: 50%;
    background: var(--gradient-perfume);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-soft);
    animation: pulse 3s infinite ease-in-out;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: var(--shadow-soft);
    }
    50% {
        transform: scale(1.05);
        box-shadow: var(--shadow-hover);
    }
}

.circle-center-content {
    text-align: center;
    color: var(--color-white);
}

.circle-center-content h3 {
    font-size: 24px;
    margin-bottom: 8px;
}

.circle-center-content p {
    font-size: 14px;
    opacity: 0.9;
}

.circle-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    position: relative;
}

.circle-item {
    background: var(--color-white);
    border-radius: 30px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.circle-item::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, var(--color-pink-light), var(--color-purple-light), var(--color-blue-light), var(--color-pink-light));
    opacity: 0;
    transition: var(--transition-smooth);
    z-index: 0;
}

.circle-item:hover::before {
    opacity: 0.15;
    animation: rotate 4s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.circle-item > * {
    position: relative;
    z-index: 1;
}

.circle-item-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: var(--gradient-perfume);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--color-white);
}

.circle-item h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--color-text-dark);
}

.circle-item p {
    color: var(--color-text-gray);
    font-size: 14px;
    line-height: 1.8;
}

.circle-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

/* ========================================
   菱形模块布局 - 服务项目
======================================== */
.diamond-layout {
    background: var(--gradient-diamond);
    padding: 100px 0;
    position: relative;
}

.diamond-layout::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><polygon points="50,0 100,50 50,100 0,50" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></svg>');
    background-size: 60px 60px;
    opacity: 0.5;
}

.diamond-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    position: relative;
    z-index: 1;
}

.diamond-card {
    background: var(--color-white);
    border-radius: 16px;
    padding: 0;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
    transform: rotate(0deg);
}

.diamond-card:hover {
    transform: translateY(-8px) rotate(2deg);
    box-shadow: var(--shadow-hover);
}

.diamond-card-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    position: relative;
}

.diamond-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.diamond-card:hover .diamond-card-image img {
    transform: scale(1.1);
}

.diamond-card-content {
    padding: 24px;
}

.diamond-card-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--color-text-dark);
}

.diamond-card-content p {
    color: var(--color-text-gray);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 16px;
}

.diamond-card-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-pink-bright);
    font-weight: 600;
    font-size: 14px;
}

.diamond-card-link:hover {
    gap: 12px;
}

/* ========================================
   资讯列表模块
======================================== */
.news-section {
    background: var(--color-white);
    padding: 100px 0;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.news-card {
    background: var(--color-gray-light);
    border-radius: var(--border-radius-soft);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.news-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.news-card-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.news-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.news-card:hover .news-card-image img {
    transform: scale(1.1);
}

.news-card-content {
    padding: 24px;
}

.news-card-date {
    font-size: 13px;
    color: var(--color-pink-bright);
    margin-bottom: 10px;
}

.news-card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text-dark);
    line-height: 1.5;
}

.news-card-excerpt {
    font-size: 14px;
    color: var(--color-text-gray);
    line-height: 1.8;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-purple-dark);
    font-weight: 600;
    font-size: 14px;
}

/* ========================================
   内页通用样式
======================================== */
.page-header {
    background: var(--gradient-perfume);
    padding: 160px 0 80px;
    text-align: center;
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.2)"/></svg>');
    background-size: 40px 40px;
}

.page-header h1 {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.page-content {
    padding: 80px 0;
    background: var(--color-white);
}

.content-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ========================================
   关于我们页面
======================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.about-image {
    border-radius: var(--border-radius-soft);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
}

.about-image img {
    width: 100%;
    height: auto;
    transition: var(--transition-smooth);
}

.about-image:hover img {
    transform: scale(1.05);
}

.about-content h2 {
    font-size: 32px;
    margin-bottom: 24px;
    background: var(--gradient-perfume);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-content p {
    color: var(--color-text-gray);
    line-height: 2;
    margin-bottom: 20px;
}

/* ========================================
   团队展示
======================================== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.team-card {
    text-align: center;
    background: var(--color-gray-light);
    border-radius: var(--border-radius-soft);
    padding: 40px 30px;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.team-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.team-avatar {
    width: 150px;
    height: 150px;
    margin: 0 auto 24px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--color-pink-light);
}

.team-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.team-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
    color: var(--color-text-dark);
}

.team-card-title {
    color: var(--color-pink-bright);
    font-size: 14px;
    margin-bottom: 16px;
}

.team-card p {
    color: var(--color-text-gray);
    font-size: 14px;
    line-height: 1.8;
}

/* ========================================
   案例展示
======================================== */
.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.case-card {
    background: var(--color-white);
    border-radius: var(--border-radius-soft);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.case-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.case-card:hover .case-image img {
    transform: scale(1.1);
}

.case-content {
    padding: 24px;
}

.case-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--color-text-dark);
}

.case-content p {
    color: var(--color-text-gray);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 16px;
}

.case-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.case-tag {
    background: var(--gradient-perfume);
    color: var(--color-white);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

/* ========================================
   新闻列表页
======================================== */
.news-list-page {
    background: var(--color-gray-light);
}

.news-list-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 60px 40px;
}

.news-list-item {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 30px;
    background: var(--color-white);
    border-radius: var(--border-radius-soft);
    padding: 24px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
}

.news-list-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-hover);
}

.news-list-item-image {
    width: 100%;
    height: 180px;
    border-radius: var(--border-radius-soft);
    overflow: hidden;
}

.news-list-item-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.news-list-item:hover .news-list-item-image img {
    transform: scale(1.1);
}

.news-list-item-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-list-item-date {
    font-size: 13px;
    color: var(--color-pink-bright);
    margin-bottom: 10px;
}

.news-list-item-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text-dark);
}

.news-list-item-excerpt {
    color: var(--color-text-gray);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-list-item-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-purple-dark);
    font-weight: 600;
    font-size: 14px;
    width: fit-content;
}

/* ========================================
   新闻详情页
======================================== */
.news-detail-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 40px;
    background: var(--color-white);
}

.news-detail-header {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 2px solid var(--color-gray-light);
}

.news-detail-date {
    font-size: 14px;
    color: var(--color-pink-bright);
    margin-bottom: 16px;
}

.news-detail-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text-dark);
    margin-bottom: 20px;
    line-height: 1.4;
}

.news-detail-meta {
    display: flex;
    gap: 20px;
    font-size: 14px;
    color: var(--color-text-gray);
}

.news-detail-content {
    font-size: 16px;
    line-height: 2;
    color: var(--color-text-dark);
}

.news-detail-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-soft);
    margin: 30px 0;
}

.news-detail-content p {
    margin-bottom: 20px;
}

/* 相关新闻 */
.related-news {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 2px solid var(--color-gray-light);
}

.related-news h3 {
    font-size: 24px;
    margin-bottom: 30px;
    color: var(--color-text-dark);
}

.related-news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.related-news-card {
    background: var(--color-gray-light);
    border-radius: var(--border-radius-soft);
    padding: 20px;
    transition: var(--transition-smooth);
}

.related-news-card:hover {
    background: var(--color-pink-light);
    transform: translateY(-4px);
}

.related-news-card h4 {
    font-size: 16px;
    margin-bottom: 10px;
    color: var(--color-text-dark);
}

.related-news-card date {
    font-size: 13px;
    color: var(--color-text-gray);
}

/* ========================================
   动画效果
======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ========================================
   响应式设计
======================================== */
@media (max-width: 1024px) {
    .header-container {
        padding: 0 20px;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background: var(--color-white);
        flex-direction: column;
        padding: 20px;
        gap: 10px;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-smooth);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hamburger {
        display: flex;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .news-list-item {
        grid-template-columns: 1fr;
    }
    
    .news-list-item-image {
        height: 200px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }
    
    .footer-container,
    .content-container,
    .news-list-container,
    .news-detail-container {
        padding: 0 20px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
        text-align: center;
    }
    
    .circle-items,
    .diamond-grid,
    .news-grid,
    .team-grid,
    .case-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        padding: 120px 0 60px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .logo-text {
        font-size: 20px;
    }
    
    .circle-center {
        width: 200px;
        height: 200px;
    }
    
    .section-title {
        font-size: 24px;
    }
}