:root {
--primary-color: #0080FF;
--primary-dark: #0066CC;
--primary-light: #3399FF;
--text-color: #333;
--light-text: #fff;
--bg-color: #f5f9ff;
--card-bg: #ffffff;
--shadow: 0 10px 20px rgba(0, 128, 255, 0.15);
--deep-shadow: 0 15px 30px rgba(0, 128, 255, 0.25);
--transition: all 0.3s ease;
}

* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
background-color: var(--bg-color);
color: var(--text-color);
line-height: 1.6;
}

a {
text-decoration: none;
color: inherit;
}

.container {
width: 100%;
max-width: 1200px;
margin: 0 auto;
padding: 0 20px;
}

/* 导航栏样式 */
header {
background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
box-shadow: var(--shadow);
position: sticky;
top: 0;
z-index: 1000;
margin-bottom: 30px;
}

.navbar {
display: flex;
justify-content: space-between;
align-items: center;
padding: 15px 0;
}

.logo {
font-size: 24px;
font-weight: 700;
color: var(--light-text);
position: relative;
overflow: hidden;
padding: 5px 10px;
border-radius: 5px;
transition: var(--transition);
}

.logo::before {
content: '';
position: absolute;
top: 0;
left: -100%;
width: 100%;
height: 100%;
background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
transition: left 0.5s;
}

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

.logo:hover {
transform: translateY(-2px);
box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.nav-links {
display: flex;
list-style: none;
}

.nav-links li {
position: relative;
margin-left: 25px;
}

.nav-links a {
color: var(--light-text);
font-weight: 500;
padding: 8px 15px;
border-radius: 5px;
transition: var(--transition);
position: relative;
overflow: hidden;
}

.nav-links a::before, .nav-links a::after {
content: '';
position: absolute;
width: 0;
height: 2px;
bottom: 0;
background-color: var(--light-text);
transition: var(--transition);
}

.nav-links a::before {
left: 50%;
}

.nav-links a::after {
right: 50%;
}

.nav-links a:hover::before, .nav-links a:hover::after {
width: 50%;
}

.nav-links a:hover {
background-color: rgba(255, 255, 255, 0.1);
transform: translateY(-2px);
}

.hamburger {
display: none;
flex-direction: column;
cursor: pointer;
}

.hamburger span {
width: 25px;
height: 3px;
background-color: var(--light-text);
margin: 3px 0;
transition: var(--transition);
border-radius: 2px;
}

/* 主要内容区域 */
main {
padding: 40px 0;
}

.section-title {
font-size: 28px;
margin-bottom: 30px;
color: var(--primary-dark);
position: relative;
padding-bottom: 10px;
}

.section-title::after {
content: '';
position: absolute;
bottom: 0;
left: 0;
width: 60px;
height: 3px;
background: linear-gradient(to right, var(--primary-color), transparent);
}

/* 第一排：最新文章列表 */
.latest-articles {
margin-bottom: 60px;
}

.articles-grid {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 30px;
}

.article-card {
background-color: var(--card-bg);
border-radius: 10px;
padding: 25px;
box-shadow: var(--shadow);
transition: var(--transition);
position: relative;
overflow: hidden;
}

.article-card::before {
content: '';
position: absolute;
top: 0;
left: 0;
width: 5px;
height: 100%;
background: linear-gradient(to bottom, var(--primary-color), var(--primary-light));
transition: var(--transition);
z-index: 0;
}

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

.article-card:hover::before {
width: 100%;
opacity: 0.1;
}

.article-title {
font-size: 20px;
margin-bottom: 15px;
color: var(--primary-dark);
transition: var(--transition);
line-height: 1.4;
position: relative; /* 确保内容在伪元素上方 */
z-index: 1;
}

.article-title a:hover {
color: var(--primary-color);
}

.article-meta {
display: flex;
align-items: center;
margin-bottom: 15px;
font-size: 14px;
color: #666;
}

.article-meta span {
margin-right: 15px;
display: flex;
align-items: center;
}

.article-meta span::before {
margin-right: 5px;
}

.time::before {
content: "🕒";
}

.author::before {
content: "👤";
}

.article-description {
color: #555;
line-height: 1.6;
}

/* 第二排：推荐文章图片列表 */
.featured-articles {
margin-bottom: 60px;
}

.featured-grid {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 20px;
}

.featured-card {
height: 250px;
border-radius: 10px;
overflow: hidden;
position: relative;
box-shadow: var(--shadow);
transition: var(--transition);
}

.featured-card::before {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: linear-gradient(to bottom, transparent, rgba(0,0,0,0.7));
z-index: 1;
}

.featured-bg {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-size: cover;
background-position: center;
transition: var(--transition);
}

.featured-content {
position: absolute;
bottom: 0;
left: 0;
width: 100%;
padding: 20px;
z-index: 2;
color: var(--light-text);
transform: translateY(10px);
transition: var(--transition);
}

.featured-title {
font-size: 18px;
margin-bottom: 10px;
line-height: 1.4;
}

.featured-description {
display: none;
}

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

.featured-card:hover .featured-bg {
transform: scale(1.1);
}

.featured-card:hover .featured-content {
transform: translateY(0);
}

.featured-card:hover .featured-description {
opacity: 1;
max-height: 100px;
}

/* 第三排：热门文章列表 */
.popular-articles {
margin-bottom: 60px;
}

.popular-card {
background-color: var(--card-bg);
border-radius: 10px;
padding: 25px;
box-shadow: var(--shadow);
transition: var(--transition);
display: flex;
flex-direction: column;
}

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

.popular-header {
display: flex;
justify-content: space-between;
align-items: flex-start;
margin-bottom: 15px;
}

.popular-title {
font-size: 18px;
color: var(--primary-dark);
flex: 1;
margin-right: 15px;
line-height: 1.4;
}

.popular-meta {
display: flex;
flex-direction: column;
align-items: flex-end;
min-width: 120px;
}

.popular-meta span {
display: flex;
align-items: center;
margin-bottom: 5px;
font-size: 14px;
color: #666;
}

.popular-meta span::before {
margin-right: 5px;
}

.views::before {
content: "👁️";
}

.popular-description {
color: #555;
line-height: 1.6;
display: -webkit-box;
-webkit-line-clamp: 2;
-webkit-box-orient: vertical;
overflow: hidden;
}

/* 第四排：文字介绍 */
.intro-section {
margin-bottom: 60px;
background-color: var(--card-bg);
border-radius: 10px;
padding: 30px;
box-shadow: var(--shadow);
}

.intro-content {
font-size: 16px;
line-height: 1.8;
color: #555;
}

/* 第五排：友情链接 */
.links-section {
margin-bottom: 60px;
}

.links-container {
display: flex;
flex-wrap: wrap;
gap: 15px;
}

.link-item {
background-color: var(--card-bg);
border-radius: 5px;
padding: 8px 15px;
box-shadow: var(--shadow);
transition: var(--transition);
font-size: 14px;
}

.link-item:hover {
background-color: var(--primary-color);
color: var(--light-text);
transform: translateY(-3px);
}

/* 底部 */
footer {
background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
color: var(--light-text);
padding: 30px 0;
text-align: center;
}

.copyright {
font-size: 16px;
}

.copyright a {
font-weight: 600;
transition: var(--transition);
padding: 3px 8px;
border-radius: 3px;
}

.copyright a:hover {
background-color: rgba(255, 255, 255, 0.1);
text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 1024px) {
.nav-links {
position: fixed;
top: 70px;
right: -100%;
width: 70%;
height: calc(100vh - 70px);
background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
flex-direction: column;
align-items: center;
justify-content: flex-start;
padding-top: 40px;
transition: var(--transition);
box-shadow: -5px 0 15px rgba(0,0,0,0.1);
}

.nav-links.active {
right: 0;
}

.nav-links li {
margin: 15px 0;
}

.hamburger {
display: flex;
}

.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, -6px);
}

.articles-grid {
grid-template-columns: 1fr;
}

.featured-grid {
grid-template-columns: repeat(2, 1fr);
}

.popular-header {
flex-direction: column;
}

.popular-meta {
flex-direction: row;
justify-content: space-between;
width: 100%;
margin-top: 10px;
}

.intro-section {
display: none;
}

.links-section {
display: none;
}

.copyright {
display: none;
}
}

@media (max-width: 768px) {
.featured-grid {
grid-template-columns: 1fr;
}
}

@media (max-width: 500px) {
.featured-grid {
grid-template-columns: 1fr;
}

.popular-meta {
flex-direction: column;
align-items: flex-start;
}

.popular-meta span {
margin-bottom: 5px;
}
}