/* ========================================
   当特建站 - 全局样式文件
   奶白 + 浅灰 + 浅紫 温柔风配色
   ======================================== */

:root {
    --color-cream: #FFF8F0;
    --color-milk-white: #FFFEFA;
    --color-light-gray: #F5F5F7;
    --color-light-purple: #E8E4F0;
    --color-soft-purple: #D4CDE8;
    --color-deep-purple: #8B7FB8;
    --color-text-primary: #2D2D3A;
    --color-text-secondary: #6B6B7A;
    --color-text-light: #9A9AA8;
    --color-accent: #9B8DD6;
    --color-accent-hover: #8B7FB8;
    --shadow-soft: 0 4px 20px rgba(139, 127, 184, 0.1);
    --shadow-medium: 0 8px 30px rgba(139, 127, 184, 0.15);
    --shadow-strong: 0 12px 40px rgba(139, 127, 184, 0.2);
    --radius-small: 8px;
    --radius-medium: 16px;
    --radius-large: 24px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--color-cream);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

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

ul, ol {
    list-style: none;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   顶部导航栏
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 254, 250, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-soft);
    transition: all var(--transition-normal);
}

.header.scrolled {
    background: rgba(255, 254, 250, 0.98);
    box-shadow: var(--shadow-medium);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: 1400px;
    margin: 0 auto;
}

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

.logo img {
    height: 45px;
    width: auto;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-deep-purple);
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    gap: 35px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-primary);
    padding: 8px 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

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

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ========================================
   页面主体内容区
   ======================================== */
.main-content {
    padding-top: 80px;
    min-height: calc(100vh - 160px);
}

/* ========================================
   磁贴网格布局系统
   ======================================== */
.mosaic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    padding: 40px 0;
}

.mosaic-item {
    background: var(--color-milk-white);
    border-radius: var(--radius-medium);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: all var(--transition-normal);
    position: relative;
}

.mosaic-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-strong);
}

.mosaic-item.large {
    grid-column: span 2;
}

.mosaic-item.tall {
    grid-row: span 2;
}

.mosaic-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.mosaic-content {
    padding: 25px;
}

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

.mosaic-excerpt {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 15px;
}

.mosaic-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--color-text-light);
}

/* ========================================
   Banner 区域
   ======================================== */
.banner {
    position: relative;
    height: 600px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-light-purple) 0%, var(--color-soft-purple) 100%);
}

.banner-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
}

.banner-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 20px;
    max-width: 900px;
}

.banner-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease;
}

.banner-subtitle {
    font-size: 20px;
    color: var(--color-text-secondary);
    margin-bottom: 35px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.banner-btn {
    display: inline-block;
    padding: 15px 40px;
    background: var(--color-accent);
    color: white;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    transition: all var(--transition-normal);
    animation: fadeInUp 0.8s ease 0.4s both;
}

.banner-btn:hover {
    background: var(--color-accent-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
    color: white;
}

/* ========================================
   核心优势板块
   ======================================== */
.features-section {
    padding: 80px 0;
    background: var(--color-milk-white);
}

.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--color-text-primary);
}

.section-subtitle {
    text-align: center;
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 50px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--color-light-gray);
    padding: 35px 30px;
    border-radius: var(--radius-medium);
    text-align: center;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    background: var(--color-light-purple);
    transform: translateY(-5px);
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: var(--color-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon img {
    width: 35px;
    height: 35px;
}

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

.feature-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ========================================
   快速入口板块
   ======================================== */
.quick-access {
    padding: 80px 0;
    background: var(--color-cream);
}

.access-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.access-card {
    background: var(--color-milk-white);
    padding: 30px;
    border-radius: var(--radius-medium);
    text-align: center;
    box-shadow: var(--shadow-soft);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.access-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.access-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 15px;
    background: var(--color-light-purple);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.access-icon img {
    width: 30px;
    height: 30px;
}

.access-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 8px;
}

.access-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
}

/* ========================================
   资讯列表板块
   ======================================== */
.news-section {
    padding: 80px 0;
    background: var(--color-milk-white);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.news-card {
    background: var(--color-light-gray);
    border-radius: var(--radius-medium);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.news-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.news-content {
    padding: 25px;
}

.news-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-excerpt {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--color-text-light);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--color-text-primary);
    color: var(--color-light-gray);
    padding: 60px 0 30px;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo img {
    height: 40px;
}

.footer-logo-text {
    font-size: 22px;
    font-weight: 700;
    color: white;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    color: var(--color-text-light);
}

.footer-title {
    font-size: 16px;
    font-weight: 600;
    color: white;
    margin-bottom: 20px;
}

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

.footer-links a {
    font-size: 14px;
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

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

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    font-size: 14px;
    color: var(--color-text-light);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
    font-size: 13px;
    color: var(--color-text-light);
}

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

.fade-in {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.scroll-animate.show {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 992px) {
    .banner-title {
        font-size: 36px;
    }
    
    .banner-subtitle {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 30px;
    }
    
    .mosaic-item.large {
        grid-column: span 1;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 75px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 75px);
        background: var(--color-milk-white);
        flex-direction: column;
        padding: 30px;
        gap: 20px;
        transition: left var(--transition-normal);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .banner {
        height: 450px;
    }
    
    .banner-title {
        font-size: 28px;
    }
    
    .banner-subtitle {
        font-size: 16px;
    }
    
    .features-section,
    .quick-access,
    .news-section {
        padding: 50px 0;
    }
    
    .section-title {
        font-size: 26px;
    }
}

@media (max-width: 576px) {
    .banner {
        height: 380px;
    }
    
    .banner-title {
        font-size: 24px;
    }
    
    .banner-btn {
        padding: 12px 30px;
        font-size: 14px;
    }
    
    .mosaic-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .access-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   内页通用样式
   ======================================== */
.page-header {
    background: linear-gradient(135deg, var(--color-light-purple) 0%, var(--color-soft-purple) 100%);
    padding: 120px 0 60px;
    text-align: center;
}

.page-title {
    font-size: 40px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 15px;
}

.page-breadcrumb {
    font-size: 14px;
    color: var(--color-text-secondary);
}

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

.content-section {
    padding: 60px 0;
}

/* ========================================
   新闻详情页样式
   ======================================== */
.news-detail-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

.news-detail-header {
    margin-bottom: 30px;
}

.news-detail-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 15px;
    line-height: 1.4;
}

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

.news-detail-content {
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.news-detail-content img {
    max-width: 100%;
    height: auto;
    margin: 20px 0;
    border-radius: var(--radius-medium);
}

.related-news {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid var(--color-light-gray);
}

.related-news-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 25px;
    color: var(--color-text-primary);
}

/* ========================================
   关于页面样式
   ======================================== */
.about-intro {
    padding: 60px 0;
    background: var(--color-milk-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

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

.about-image img {
    width: 100%;
    height: auto;
}

.about-text h3 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--color-text-primary);
}

.about-text p {
    font-size: 15px;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: 15px;
}

/* ========================================
   服务页面样式
   ======================================== */
.service-card {
    background: var(--color-milk-white);
    border-radius: var(--radius-medium);
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow-soft);
    transition: all var(--transition-normal);
}

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

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: var(--color-light-purple);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-icon img {
    width: 40px;
    height: 40px;
}

.service-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--color-text-primary);
}

.service-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.service-price {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-accent);
}

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

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

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.case-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.case-content {
    padding: 25px;
}

.case-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--color-text-primary);
}

.case-category {
    font-size: 13px;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.case-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ========================================
   联系页面样式
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info {
    background: var(--color-milk-white);
    padding: 40px;
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-soft);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 30px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--color-light-purple);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon img {
    width: 25px;
    height: 25px;
}

.contact-text h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text-primary);
}

.contact-text p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.contact-form {
    background: var(--color-milk-white);
    padding: 40px;
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-soft);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--color-text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--color-light-gray);
    border-radius: var(--radius-small);
    font-size: 14px;
    font-family: inherit;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-btn {
    width: 100%;
    padding: 14px;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-small);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

@media (max-width: 768px) {
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .page-title {
        font-size: 32px;
    }
    
    .news-detail-title {
        font-size: 26px;
    }
}