/* ========================================
   basf-cc.cn 高端品牌建站 - 全局样式
   茶叶简约风 | 墨绿 + 米白 + 浅灰
   ======================================== */

/* CSS Reset & 基础变量 */
:root {
    --color-primary: #2C5530;      /* 墨绿 - 主色 */
    --color-secondary: #F5F1E8;    /* 米白 - 背景 */
    --color-accent: #8B9A7D;       /* 浅灰绿 - 点缀 */
    --color-text: #333333;         /* 深灰 - 文字 */
    --color-light: #FFFFFF;        /* 纯白 */
    --color-border: #E0E0E0;       /* 边框灰 */
    --font-main: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    --transition: all 0.3s ease;
    --shadow: 0 4px 20px rgba(44, 85, 48, 0.08);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-secondary);
    color: var(--color-text);
    line-height: 1.8;
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

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

/* ========================================
   顶部导航栏 - 对角分割设计
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: var(--transition);
    padding: 20px 0;
}

.header.scrolled {
    background: rgba(44, 85, 48, 0.95);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo img {
    height: 50px;
    width: auto;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-light);
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    color: var(--color-light);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 1px;
    position: relative;
    padding: 8px 0;
}

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

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 10px;
}

.hamburger span {
    width: 30px;
    height: 3px;
    background: var(--color-light);
    transition: var(--transition);
}

/* ========================================
   对角分割布局系统
   ======================================== */
.diagonal-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.diagonal-split {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
    background: var(--color-primary);
    z-index: -1;
}

.diagonal-split.reverse {
    clip-path: polygon(0 15%, 100% 0, 100% 100%, 0 100%);
    background: var(--color-secondary);
}

.section-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 120px 40px 80px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

/* ========================================
   Hero Banner - 首页首屏
   ======================================== */
.hero-banner {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, var(--color-primary) 0%, #1a3a1f 100%);
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.05;
    background-image: url('../images/pattern.svg');
    background-size: 60px 60px;
}

.hero-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 120px 40px 80px;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text h1 {
    font-size: 56px;
    font-weight: 700;
    color: var(--color-light);
    line-height: 1.2;
    margin-bottom: 30px;
    letter-spacing: -1px;
}

.hero-text .subtitle {
    font-size: 20px;
    color: rgba(255,255,255,0.85);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.btn {
    display: inline-block;
    padding: 16px 40px;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 1px;
    border-radius: 0;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--color-light);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.btn-outline {
    background: transparent;
    color: var(--color-light);
    border-color: var(--color-light);
}

.btn-outline:hover {
    background: var(--color-light);
    color: var(--color-primary);
    transform: translateY(-3px);
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.3);
}

/* ========================================
   服务卡片 - 对角对称
   ======================================== */
.services-section {
    padding: 100px 40px;
    background: var(--color-secondary);
}

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

.section-header h2 {
    font-size: 42px;
    color: var(--color-primary);
    margin-bottom: 20px;
    font-weight: 700;
}

.section-header p {
    font-size: 18px;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

.services-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--color-light);
    padding: 40px 30px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

.service-card:hover::before {
    transform: scaleX(1);
}

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

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-icon img {
    width: 100%;
    height: auto;
}

.service-card h3 {
    font-size: 20px;
    color: var(--color-primary);
    margin-bottom: 15px;
    font-weight: 600;
}

.service-card p {
    font-size: 15px;
    color: #666;
    line-height: 1.7;
}

/* ========================================
   案例展示 - 交错布局
   ======================================== */
.cases-section {
    padding: 100px 40px;
    background: var(--color-light);
}

.cases-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.case-item {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    cursor: pointer;
}

.case-item img {
    width: 100%;
    height: 350px;
    object-fit: cover;
    transition: var(--transition);
}

.case-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 30px;
    background: linear-gradient(to top, rgba(44,85,48,0.95), transparent);
    color: var(--color-light);
    transform: translateY(100%);
    transition: var(--transition);
}

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

.case-item:hover .case-overlay {
    transform: translateY(0);
}

.case-overlay h3 {
    font-size: 22px;
    margin-bottom: 10px;
}

.case-overlay p {
    font-size: 14px;
    opacity: 0.9;
}

/* ========================================
   新闻资讯 - 首页列表
   ======================================== */
.news-section {
    padding: 100px 40px;
    background: var(--color-secondary);
}

.news-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.news-card {
    background: var(--color-light);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

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

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

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

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

.news-content {
    padding: 25px;
}

.news-content h3 {
    font-size: 18px;
    color: var(--color-primary);
    margin-bottom: 12px;
    font-weight: 600;
    line-height: 1.4;
}

.news-content p {
    font-size: 14px;
    color: #666;
    margin-bottom: 15px;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    font-size: 13px;
    color: #999;
}

/* ========================================
   页脚 - 对角设计
   ======================================== */
.footer {
    background: var(--color-primary);
    color: var(--color-light);
    padding: 80px 40px 40px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: -50px;
    left: 0;
    width: 100%;
    height: 50px;
    background: var(--color-secondary);
    clip-path: polygon(0 100%, 100% 0, 100% 100%, 0 100%);
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand .logo-text {
    font-size: 28px;
    margin-bottom: 20px;
}

.footer-brand p {
    font-size: 15px;
    opacity: 0.8;
    line-height: 1.8;
    margin-bottom: 25px;
}

.footer-contact {
    font-size: 15px;
    opacity: 0.8;
    line-height: 2;
}

.footer-links h4,
.footer-nav h4 {
    font-size: 18px;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 12px;
}

.footer-links h4::after,
.footer-nav h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--color-secondary);
}

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

.footer-links a,
.footer-nav a {
    font-size: 15px;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover,
.footer-nav a:hover {
    opacity: 1;
    padding-left: 10px;
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: 14px;
    opacity: 0.7;
}

/* ========================================
   内页通用样式
   ======================================== */
.page-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1a3a1f 100%);
    padding: 180px 40px 100px;
    text-align: center;
    position: relative;
}

.page-header h1 {
    font-size: 48px;
    color: var(--color-light);
    margin-bottom: 20px;
    font-weight: 700;
}

.page-header p {
    font-size: 18px;
    color: rgba(255,255,255,0.8);
    max-width: 600px;
    margin: 0 auto;
}

.content-section {
    padding: 100px 40px;
    background: var(--color-secondary);
}

.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

/* ====================================
   资讯列表页样式
   ==================================== */
.news-list-page {
    padding: 100px 40px;
    background: var(--color-secondary);
}

.news-list-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

/* ====================================
   资讯详情页样式
   ==================================== */
.news-detail-page {
    padding: 100px 40px;
    background: var(--color-secondary);
}

.news-detail-container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--color-light);
    padding: 60px;
    border: 1px solid var(--color-border);
}

.news-detail-header {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--color-border);
}

.news-detail-header h1 {
    font-size: 36px;
    color: var(--color-primary);
    margin-bottom: 20px;
    line-height: 1.3;
}

.news-detail-meta {
    font-size: 14px;
    color: #999;
}

.news-detail-content {
    font-size: 17px;
    line-height: 2;
    color: #333;
}

.news-detail-content img {
    max-width: 100%;
    height: auto;
    margin: 30px 0;
    border-radius: 8px;
}

.related-news {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

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

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1200px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .section-content {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--color-primary);
        flex-direction: column;
        padding: 20px 40px;
        gap: 20px;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .hamburger {
        display: flex;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 20px;
    }
    
    .hero-container,
    .section-content,
    .services-section,
    .cases-section,
    .news-section {
        padding-left: 20px;
        padding-right: 20px;
    }
    
    .hero-text h1 {
        font-size: 36px;
    }
    
    .services-grid,
    .cases-grid,
    .news-grid,
    .news-list-container {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .page-header h1 {
        font-size: 32px;
    }
    
    .news-detail-container {
        padding: 30px;
    }
}

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

.animate-in {
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }