/* ========================================
   How Encyclopedia - 自定义样式系统
   基于Logo配色：蓝色 #1976D2 + 绿色 #4CAF50
   ======================================== */

/* ==================== CSS变量定义 ==================== */
:root {
    /* 主色调 */
    --primary-blue: #1976D2;
    --primary-green: #4CAF50;
    --accent-blue: #2196F3;
    --accent-green: #66BB6A;

    /* 深色调 */
    --dark-blue: #0D47A1;
    --dark-green: #2E7D32;
    --text-dark: #263238;
    --text-darker: #37474F;

    /* 浅色调 */
    --light-blue: #E3F2FD;
    --light-green: #E8F5E9;
    --bg-light: #FAFAFA;
    --bg-white: #FFFFFF;

    /* 功能色 */
    --border-color: #E0E0E0;
    --shadow-light: rgba(0, 0, 0, 0.08);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --shadow-heavy: rgba(0, 0, 0, 0.25);

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-blue) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--primary-green) 0%, var(--accent-green) 100%);
    --gradient-mixed: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-green) 100%);

    /* 字体 */
    --font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;

    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;

    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ==================== 全局重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--text-dark);
    line-height: 1.6;
    background: linear-gradient(to bottom, #FAFAFA 0%, #FFFFFF 50%);
    min-height: 100vh;
}
a {
    text-decoration: none;
}

/* ==================== 布局系统 ==================== */
.container {
    /*width: 100%;*/
    max-width: 1200px;
    margin: 0 auto;
    /*padding: 0 var(--spacing-lg);*/
}

.row {
    display: flex;
    column-gap: 1.5rem;
    /*flex-wrap: wrap;*/
    /*margin: 0 calc(-1 * var(--spacing-md));*/
}

.offset-lg-1 { margin-left: 0; }

/* ==================== 导航栏 ==================== */
.navbar {
    background: linear-gradient(to right, #FFFFFF 0%, #F8FBFF 100%);
    border-bottom: 3px solid transparent;
    border-image: var(--gradient-mixed) 1;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px var(--shadow-light);
    animation: slideDown 0.5s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-md);
    padding-bottom: var(--spacing-md);
}

.navbar-brand img {
    height: 33px;
    transition: transform var(--transition-base);
}

.navbar-brand:hover img {
    transform: scale(1.05) rotate(-2deg);
}

.navbar-collapse {
    display: flex;
    align-items: center;
    /*flex: 1;*/
    justify-content: space-between;
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
    margin-right: 30px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    position: relative;
    transition: all var(--transition-base);
    border-radius: var(--radius-md);
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--gradient-mixed);
    transform: translateX(-50%);
    transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-blue);
    background: var(--light-blue);
}

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

/* 语言选择器 */
.language-selector {
    position: relative;
}

.language-selector .btn {
    background: var(--gradient-mixed);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.3);
}

.language-selector .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(25, 118, 210, 0.4);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + var(--spacing-sm));
    right: 0;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px var(--shadow-medium);
    min-width: 150px;
    padding: var(--spacing-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: 1001;
}

.dropdown-menu li {
    list-style:  none;
}

.language-selector:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--text-dark);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--light-blue);
    color: var(--primary-blue);
    padding-left: calc(var(--spacing-lg) + 8px);
}

/* 移动端菜单切换 */
.navbar-toggler {
    display: none;
    background: none;
    border: 2px solid var(--primary-blue);
    /*padding: var(--spacing-sm);*/
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 14px 4px;
}

.navbar-toggler-icon {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--primary-blue);
    position: relative;
    transition: all var(--transition-base);
}

.navbar-toggler-icon::before,
.navbar-toggler-icon::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--primary-blue);
    left: 0;
    transition: all var(--transition-base);
}

.navbar-toggler-icon::before {
    top: -8px;
}

.navbar-toggler-icon::after {
    top: 8px;
}

/* ==================== Hero区域 ==================== */
.hero-section {
    background: linear-gradient(135deg,
        var(--light-blue) 0%,
        var(--light-green) 50%,
        var(--light-blue) 100%);
    padding: var(--spacing-2xl) 0;
    position: relative;
    overflow: hidden;
    margin-bottom: 35px;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(25, 118, 210, 0.1) 0%, transparent 70%);
    border-radius: var(--radius-full);
    animation: float 20s infinite ease-in-out;
}

.hero-section::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(76, 175, 80, 0.1) 0%, transparent 70%);
    border-radius: var(--radius-full);
    animation: float 15s infinite ease-in-out reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

.hero-section h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-darker);
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 1;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
}

.hero-section p {
    font-size: 1.1rem;
    color: var(--text-dark);
    line-height: 1.8;
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}



.category-article-title {
    text-decoration: none;
    color: #fff;
    font-size: 1.75rem;
    line-height: 1.7;
    position: relative;
    padding: 0.5rem 0;
    transition: color 0.3s ease;

    /* 从中间向两边展开的下划线效果 */
    background-image: linear-gradient(90deg, #fff, #fff);
    background-repeat: no-repeat;
    background-size: 0% 2px;
    background-position: center bottom; /* 关键修改：从center开始 */

    /* 确保多行文字都有下划线 */
    background-position-y: bottom;
    -webkit-box-decoration-break: clone;
    box-decoration-break: clone;
    display: inline; /* 关键2：添加inline，让样式克隆到每行 */

    /* 控制动画速度 */
    transition: color 0.3s ease, background-size 0.8s ease;
}

.category-article-title:hover,
.category-article-title.active {
    background-size: 100% 2px; /* 从中间向两边展开到100% */
}

/* ==================== 博客卡片 ==================== */
.blog-card {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
    box-shadow: 0 4px 20px var(--shadow-light);
    /*height: 100%;*/
    display: flex;
    flex-direction: column;
    position: relative;
}

.blog-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-mixed);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

/*.blog-card:hover {*/
/*    transform: translateY(-10px);*/
/*    box-shadow: 0 12px 40px var(--shadow-medium);*/
/*}*/

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

.blog-card-img-wrapper {
    position: relative;
    overflow: hidden;
    height: 300px;
    /*background: linear-gradient(135deg, var(--light-blue), var(--light-green));*/
}

.blog-card img {
    width: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
    height: 100%;
}

.blog-card:hover img {
    transform: scale(1.15) rotate(2deg);
}

.blog-card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top,
        rgba(0, 0, 0, 0.9) 0%,
        rgba(0, 0, 0, 0.6) 50%,
        transparent 100%);
    padding: var(--spacing-lg);
    color: white;
}

.blog-card-overlay .category {
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.blog-card-badge {
    background: var(--gradient-secondary);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-lg);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.4);
    margin: 0 20px 0 0;
}

.card-date {
    font-size: 0.85rem;
    opacity: 0.9;
}
.little-card-date {
    color: #78909C !important;
}

.category {
    margin-bottom: 15px;
}

.blog-card-body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.blog-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-darker);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color var(--transition-base);
}

.blog-card:hover .blog-card-title {
    color: var(--primary-blue);
}

.blog-card-text {
    color: #546E7A;
    font-size: 0.95rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
    min-height: 100px;
}

/* 特色卡片 */
.featured-card .blog-card-img-wrapper {
    height: 400px;
}

.featured-card .blog-card-overlay h4 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.top-module {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 1.5rem;
}

.top-left-card {
    display: grid;
}

.top-left-card .mb-3 {
    height: 125px;
}

/* 小卡片 */
.top-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 18px;
    transition: all var(--transition-base);
    box-shadow: 0 2px 12px var(--shadow-light);
    border-left: 4px solid transparent;
}

.top-card:hover {
    transform: translateX(8px);
    box-shadow: 0 4px 20px var(--shadow-medium);
    border-left-color: var(--primary-green);
}

.top-card img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-right: var(--spacing-md);
}

.hover-shadow {
    transition: all var(--transition-base);
}

.hover-shadow:hover {
    box-shadow: 0 8px 24px var(--shadow-medium);
    transform: translateY(-4px);
}

/* Badge样式 */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--radius-lg);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.3px;
    margin: 0 20px 0 0;
}

.bg-success { background: var(--gradient-secondary); color: white; }
.bg-info { background: var(--gradient-primary); color: white; }
.bg-primary { background: var(--primary-blue); color: white; }
.bg-danger { background: linear-gradient(135deg, #E53935, #EF5350); color: white; }
.bg-warning { background: linear-gradient(135deg, #FFA726, #FFB74D); color: white; }

/* ==================== 区块标题 ==================== */
.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-darker);
    margin-bottom: var(--spacing-xl);
    position: relative;
    padding-bottom: var(--spacing-md);
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-mixed);
    border-radius: var(--radius-sm);
}

.section-title::before {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 50%;
    height: 4px;
    background: var(--primary-green);
    border-radius: var(--radius-sm);
    opacity: 0.5;
}

/* ==================== 面包屑导航 ==================== */
.breadcrumb {
    /*display: flex;*/
    list-style: none;
    padding: var(--spacing-md) 0;
    background: transparent;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    color: #78909C;
    animation: slideInLeft 0.5s ease;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: '/';
    margin: 0 var(--spacing-sm);
    color: #666;
}

.breadcrumb a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
}

.breadcrumb a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width var(--transition-base);
}

/*.breadcrumb-item a:hover {*/
/*    color: var(--primary-green);*/
/*}*/

.breadcrumb a:hover::after {
    width: 100%;
}

.breadcrumb.active {
    color: #666;
    /*font-weight: 600;*/
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ==================== 页脚 ==================== */
.footer {
    background: linear-gradient(135deg, #263238 0%, #37474F 100%);
    color: #B0BEC5;
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    position: relative;
    overflow: hidden;
}
.footer .message {
    display: grid;
    grid-template-columns: 8fr 2fr 2fr 2fr;
    gap: 5.5rem;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-mixed);
}

.footer .footer-title {
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.footer .footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--gradient-secondary);
    border-radius: var(--radius-sm);
}

.footer .footer-title i {
    color: var(--primary-green);
    margin-right: var(--spacing-sm);
}

.footer ul {
    list-style: none;
}

.footer ul li {
    margin-bottom: var(--spacing-sm);
}

.footer a {
    color: #d3d9d3;
    text-decoration: none;
    transition: all var(--transition-base);
    display: inline-block;
    position: relative;
    padding-left: 0;
}

.footer a::before {
    content: '→';
    position: absolute;
    left: -20px;
    opacity: 0;
    transition: all var(--transition-base);
    color: var(--primary-green);
}

.footer a:hover {
    color: var(--primary-green);
    padding-left: 20px;
}

.footer a:hover::before {
    left: 0;
    opacity: 1;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    text-align: center;
    color: #90A4AE;
    text-align: center;
}

/* ==================== 工具类 ==================== */
.text-decoration-none {
    text-decoration: none !important;
}

.text-dark {
    color: var(--text-dark) !important;
}

.text-muted {
    color: #78909C !important;
}

.d-flex {
    display: flex;
}

.align-items-center {
    align-items: center !important;
}

.justify-content-between {
    justify-content: space-between !important;
}

.flex-grow-1 {
    flex-grow: 1 !important;
}

.rounded-3 {
    border-radius: var(--radius-lg) !important;
}

.rounded {
    border-radius: var(--radius-md) !important;
}

.p-3 {
    padding: var(--spacing-lg) !important;
}

.me-3 {
    margin-right: var(--spacing-lg) !important;
}

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }
.mb-5 { margin-bottom: var(--spacing-xl) !important; }

.mt-3 { margin-top: var(--spacing-md) !important; }

.border {
    border: 1px solid var(--border-color) !important;
}

.list-unstyled {
    list-style: none !important;
    padding-left: 0 !important;
}

.h4 {
    font-size: 1.5rem;
    font-weight: 700;
}
/*.h4:hover {*/
/*    color: var(--primary-blue);*/
/*}*/
.h5 { font-size: 1.25rem; font-weight: 700; }
/*.h5:hover {*/
/*    color: var(--primary-blue);*/
/*}*/
.h6 {
    font-size: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: #000;
}

.h6:hover {
    color: var(--primary-blue);
}

.small {
    font-size: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-top: 20px;
}
.bottom-card {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}
/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-mixed);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    /*box-shadow: 0 4px 12px #E3F2FD;*/
    z-index: 999;
}

.scroll-to-top:hover {
    /*background: #8b5cf6;*/
    transform: translateY(-3px);
    box-shadow: 0 4px 20px rgb(0 38 142 / 24%);
}

.scroll-to-top.show {
    opacity: 1;
    visibility: visible;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .container {
        padding: 0 30px;
    }
    .h6 {
        -webkit-line-clamp: 2;
        font-size: 12px;
    }
    .featured-card .blog-card-img-wrapper {
        height: 432px;
    }
    .small {
        font-size: 12px;
        margin-top: 20px !important;
    }
    .blog-card-text {
        font-size: 12px;
    }
    .footer-bottom {
        margin-left: 30px;
        margin-right: 30px;
        padding-top: 15px !important;
    }
    .blog-card-img-wrapper {
        height: auto;
    }
    .category-card-second {
        grid-template-columns: repeat(2, 1fr) !important;
    }
    .blog-card img {
        height: auto;
    }

}

@media (max-width: 768px) {
    .blog-card img {
        height: auto;
    }
    .top-decription {
        grid-template-columns: 1fr !important;
        gap: unset !important;
    }
    .top-module {
        grid-template-columns: 1fr;
    }
    .d-flex {
        grid-template-columns: 1fr 3fr;
        display: grid;
    }
    .top-card img {
        height: 100px;
        width: 100px;
    }
    .top-left-card .mb-3 {
        height: auto;
    }
    .navbar-toggler {
        display: block;
    }
    .bottom-card {
        grid-template-columns: 1fr;
        gap: unset;
    }

    .navbar-collapse {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        box-shadow: 0 8px 24px var(--shadow-medium);
        padding: var(--spacing-lg);
        flex-direction: column;
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    }

    .navbar-collapse.show {
        display: flex;
    }

    .navbar-nav {
        flex-direction: column;
        width: 100%;
        gap: 0;
    }

    .nav-link {
        padding: var(--spacing-md);
        border-radius: var(--radius-sm);
    }

    .language-selector {
        margin-top: var(--spacing-md);
        width: 100%;
    }

    .language-selector .btn {
        width: 100%;
        justify-content: center;
    }

    .hero-section h1 {
        font-size: 1.75rem;
    }

    .hero-section {
        padding: var(--spacing-xl) 0;
    }
    .featured-card .blog-card-img-wrapper {
        height: auto;
    }
}
@media (max-width: 540px) {
    .footer-bottom {
        margin-left: 15px;
        margin-right: 15px;
        padding-top: 15px !important;
    }
    .container {
        padding: 0 15px;
    }
    .blog-card img {
        height: auto;
    }
    .category-card-second {
        grid-template-columns: 1fr !important;
    }
    .blog-card-img-wrapper {
        height: auto;
    }
    .footer .message {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .bottom-card{
        padding: 0 50px
    }
    .badge {
        margin: 0 5px 0 0;
    }
    .card-date {
        font-size: 12px;
    }
}

/* ==================== 动画增强 ==================== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

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

/* 加载动画 */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
}

/* ==================== 打印样式 ==================== */
@media print {
    .navbar,
    .footer,
    .hero-section {
        display: none !important;
    }

    body {
        background: white;
    }

    .blog-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}