/* 
 * 北京尧图网络科技有限公司 - 网站建设定制官网
 * 国风唐装风 - 米白 + 朱红 + 明黄配色
 * 对角分割非对称布局
 */

/* ========== 全局变量 ========== */
:root {
    --color-miwhite: #F5F1E8;
    --color-zhuhong: #C43C2B;
    --color-minghuang: #D4A017;
    --color-dark: #2C2C2C;
    --color-gray: #666666;
    --color-light: #FFFFFF;
    --font-primary: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(196, 60, 43, 0.15);
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-miwhite);
    color: var(--color-dark);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

/* ========== 顶部导航栏 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: var(--transition-smooth);
}

.header.scrolled {
    background: rgba(245, 241, 232, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo img {
    width: 60px;
    height: 60px;
    object-fit: contain;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--color-zhuhong);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    position: relative;
    padding: 0.5rem 1rem;
    color: var(--color-dark);
    font-weight: 500;
    font-size: 1rem;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-zhuhong);
    transform: translateX(-50%);
    transition: var(--transition-smooth);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

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

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--color-zhuhong);
    transition: var(--transition-smooth);
}

.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(5px, -5px);
}

/* ========== 页脚 ========== */
.footer {
    background: linear-gradient(135deg, var(--color-dark) 0%, #1a1a1a 100%);
    color: var(--color-miwhite);
    padding: 4rem 2rem 2rem;
}

.footer-inner {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h3 {
    color: var(--color-minghuang);
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

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

.footer-links li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    color: var(--color-miwhite);
    opacity: 0.8;
}

.footer-links a:hover {
    opacity: 1;
    color: var(--color-minghuang);
    padding-left: 5px;
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1rem;
    opacity: 0.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    opacity: 0.7;
}

/* ========== 通用组件 ========== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--color-zhuhong);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-zhuhong), var(--color-minghuang));
}

.section-title p {
    color: var(--color-gray);
    font-size: 1.1rem;
    margin-top: 1.5rem;
}

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--color-zhuhong);
    color: var(--color-light);
    border: none;
    border-radius: 0;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition-smooth);
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    background: var(--color-minghuang);
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

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

.btn-outline:hover {
    background: var(--color-zhuhong);
    color: var(--color-light);
}

/* ========== 卡片样式 ========== */
.card {
    background: var(--color-light);
    border-radius: 0;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-smooth);
    position: relative;
}

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

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

.card:hover::before {
    transform: scaleY(1);
}

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

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

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

.card-content {
    padding: 1.5rem;
}

.card-title {
    font-size: 1.3rem;
    color: var(--color-dark);
    margin-bottom: 0.8rem;
}

.card-excerpt {
    color: var(--color-gray);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-gray);
    font-size: 0.85rem;
}

/* ========== 对角分割布局 ========== */
.diagonal-section {
    position: relative;
    overflow: hidden;
}

.diagonal-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-miwhite) 40%, var(--color-zhuhong) 60%);
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 80%);
}

.diagonal-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

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

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

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .diagonal-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--color-miwhite);
        flex-direction: column;
        padding: 2rem;
        gap: 1rem;
        transition: var(--transition-smooth);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title h2 {
        font-size: 2rem;
    }
}

/* ========== 页面特有样式 ========== */
.page-header {
    background: linear-gradient(135deg, var(--color-zhuhong) 0%, #8B2318 100%);
    padding: 8rem 2rem 4rem;
    text-align: center;
    color: var(--color-light);
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 新闻列表特殊样式 */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.news-category-title {
    font-size: 1.5rem;
    color: var(--color-zhuhong);
    margin: 2rem 0 1.5rem;
    padding-left: 1rem;
    border-left: 4px solid var(--color-minghuang);
}

/* 详情页样式 */
.article-detail {
    max-width: 900px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.article-detail h1 {
    font-size: 2.5rem;
    color: var(--color-zhuhong);
    margin-bottom: 1.5rem;
}

.article-meta {
    display: flex;
    gap: 2rem;
    color: var(--color-gray);
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #ddd;
}

.article-content {
    font-size: 1.1rem;
    line-height: 2;
}

.article-content img {
    max-width: 100%;
    margin: 2rem 0;
}

.related-articles {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 2px solid var(--color-minghuang);
}