/* 
 * 石油化工企业主题 v1.0
 * 设计理念：专业、现代、可靠，体现能源与化工行业特性
 * 主色调：深蓝（专业可靠）、橙色（能源活力）、灰色（工业科技）
 */

:root {
    /* --- 石油化工企业配色方案 --- */
    --c-primary: #0d2b4c;       /* 石油深蓝 - 代表专业与可靠 */
    --c-primary-dark: #071a2d;  /* 深蓝色悬停 */
    --c-secondary: #f58220;     /* 能源橙 - 代表活力与创新 */
    --c-accent: #2a7de1;        /* 科技蓝 - 强调色 */
    --c-accent-light: #4d9bf5;  /* 浅科技蓝 */
    --c-success: #27ae60;       /* 成功绿 - 安全环保 */
    
    /* --- 中性色调 --- */
    --bg-body: #f5f7fa;         /* 浅灰蓝背景 */
    --bg-white: #ffffff;        /* 纯白 */
    --bg-light: #f0f4f8;        /* 浅色背景 */
    --text-main: #1a2c3d;       /* 主文字 - 深蓝灰 */
    --text-light: #5a6c7d;      /* 次要文字 */
    --text-lighter: #8a99aa;    /* 辅助文字 */
    --border-color: #d1dce7;    /* 边框颜色 */
    --shadow-light: rgba(13, 43, 76, 0.08); /* 浅阴影 */
    --shadow-medium: rgba(13, 43, 76, 0.12); /* 中阴影 */
    
    /* --- 布局参数 --- */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --header-height: 80px;
    --max-width: 1240px;
    --shadow-card: 0 5px 15px var(--shadow-light);
    --shadow-hover: 0 12px 24px var(--shadow-medium);
    --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* === 全局重置与基础样式 === */
* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-body);
    color: var(--text-light);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    font-size: 16px;
    font-weight: 400;
    overflow-x: hidden;
}

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

ul, li { list-style: none; }

img { 
    display: block; 
    max-width: 100%; 
    height: auto; 
    border-radius: var(--radius-sm);
}

/* 添加石油化工行业相关背景图案 */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(13, 43, 76, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(245, 130, 32, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* === 容器 === */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* === 头部导航 - 石油化工专业风格 === */
.site-header {
    background: var(--bg-white);
    height: var(--header-height);
    box-shadow: 0 4px 20px rgba(13, 43, 76, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(209, 220, 231, 0.8);
}

.header-inner {
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--c-primary);
    display: flex;
    align-items: center;
    position: relative;
}

.logo a::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--c-secondary);
    border-radius: 2px;
}

.desktop-nav { 
    display: flex; 
    align-items: center; 
    gap: 6px; 
}

.desktop-nav a {
    font-size: 0.95rem; 
    font-weight: 500;
    color: var(--text-main);
    padding: 10px 18px; 
    border-radius: var(--radius-md);
    transition: var(--transition);
    position: relative;
}

.desktop-nav a:hover { 
    color: var(--c-primary); 
    background-color: rgba(13, 43, 76, 0.05); 
}

.desktop-nav a.active { 
    color: var(--c-primary); 
    background-color: rgba(13, 43, 76, 0.08); 
    font-weight: 600;
}

.desktop-nav a.active::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 18px;
    right: 18px;
    height: 2px;
    background: var(--c-secondary);
    border-radius: 1px;
}

/* 移动端菜单开关 */
.mobile-menu-trigger { 
    display: none; 
    font-size: 1.8rem; 
    cursor: pointer; 
    color: var(--text-main);
    background: rgba(13, 43, 76, 0.05);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.mobile-menu-trigger:hover {
    background: rgba(13, 43, 76, 0.1);
}

.mobile-menu-overlay {
    display: none; 
    position: fixed; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%;
    background: var(--bg-white);
    z-index: 9999;
    flex-direction: column;
    padding: 30px;
    overflow-y: auto;
}

.mobile-menu-header { 
    display: flex; 
    justify-content: space-between; 
    align-items: center;
    width: 100%; 
    margin-bottom: 40px; 
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.logo-mobile { 
    font-weight: 700; 
    font-size: 1.6rem; 
    color: var(--c-primary); 
}

.close-btn { 
    font-size: 2.5rem; 
    cursor: pointer; 
    color: var(--text-light);
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--c-primary);
    transform: rotate(90deg);
}

.mobile-nav-links { 
    display: flex; 
    flex-direction: column; 
    gap: 12px; 
}

.mobile-nav-links a { 
    font-size: 1.2rem; 
    color: var(--text-main); 
    font-weight: 500; 
    padding: 16px 20px;
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 1px solid transparent;
}

.mobile-nav-links a:hover {
    background: rgba(13, 43, 76, 0.05);
    border-color: var(--border-color);
    padding-left: 24px;
}

/* === Hero Section - 石油化工企业形象 === */
.hero-section {
    background: linear-gradient(135deg, var(--c-primary) 0%, #0a2039 100%);
    color: #fff;
    padding: 120px 0 100px;
    text-align: center;
    margin-bottom: 80px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(245, 130, 32, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 90% 80%, rgba(42, 125, 225, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content h1 { 
    font-size: 3.2rem; 
    margin-bottom: 24px; 
    font-weight: 700; 
    line-height: 1.2;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle { 
    font-size: 1.25rem; 
    margin-bottom: 48px; 
    opacity: 0.9; 
    max-width: 700px; 
    margin-left: auto; 
    margin-right: auto;
    line-height: 1.6;
}

.hero-buttons { 
    display: flex; 
    justify-content: center; 
    gap: 20px; 
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 34px; 
    font-size: 1rem;
    border-radius: var(--radius-md); 
    font-weight: 600; 
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-align: center;
    min-height: 52px;
}

.primary-btn { 
    background: var(--c-secondary); 
    color: #fff; 
    box-shadow: 0 4px 12px rgba(245, 130, 32, 0.3);
}

.primary-btn:hover { 
    background: #e6731c; 
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(245, 130, 32, 0.4);
}

.secondary-btn { 
    background: transparent; 
    border-color: rgba(255,255,255,0.4); 
    color: #fff; 
}

.secondary-btn:hover { 
    border-color: #fff; 
    background: rgba(255,255,255,0.1); 
    transform: translateY(-3px);
}

/* === Info Section (核心价值) === */
.info-section { 
    margin-bottom: 100px; 
}

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

.center-header h2 { 
    font-size: 2.5rem; 
    color: var(--text-main); 
    margin-bottom: 16px; 
    font-weight: 700;
}

.center-header p { 
    color: var(--c-secondary); 
    text-transform: uppercase; 
    letter-spacing: 2px; 
    font-size: 0.9rem; 
    font-weight: 600;
}

.center-header::after {
    content: "";
    display: block;
    width: 60px;
    height: 4px;
    background: var(--c-secondary);
    margin: 20px auto 0;
    border-radius: 2px;
}

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

.info-card {
    background: var(--bg-white);
    padding: 40px 36px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.info-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--c-secondary), var(--c-accent));
}

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

.info-card .icon { 
    font-size: 2.8rem; 
    margin-bottom: 24px; 
    color: var(--c-primary);
}

.info-card h3 { 
    font-size: 1.5rem; 
    color: var(--text-main); 
    margin-bottom: 16px; 
    font-weight: 600;
}

.info-card p { 
    color: var(--text-light); 
    margin-bottom: 24px; 
    font-size: 1rem;
    line-height: 1.7;
}

.read-more { 
    color: var(--c-accent); 
    font-weight: 600; 
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.read-more::after {
    content: "→";
    transition: transform 0.3s;
}

.read-more:hover { 
    color: var(--c-accent-light);
    gap: 12px;
}

.read-more:hover::after {
    transform: translateX(4px);
}

/* === Main Content Area === */
.main-content-area { 
    min-height: 500px; 
    margin-bottom: 100px; 
}

.section-header { 
    margin-bottom: 40px; 
    position: relative;
    padding-left: 24px;
}

.section-header::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, var(--c-secondary), var(--c-accent));
    border-radius: 2px;
}

.section-header h2 { 
    font-size: 2rem; 
    color: var(--text-main); 
    font-weight: 700;
    margin-bottom: 8px;
}

.cat-desc { 
    margin-top: 8px; 
    color: var(--text-light); 
    font-size: 1rem; 
    line-height: 1.6;
    max-width: 800px;
}

/* === Post Grid (文章列表) === */
.post-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); 
    gap: 32px; 
}

.grid-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    display: flex; 
    flex-direction: column;
    height: 100%;
}

.grid-card:hover { 
    transform: translateY(-8px); 
    box-shadow: var(--shadow-hover);
    border-color: rgba(13, 43, 76, 0.2);
}

/* 封面图处理 */
.card-cover-wrapper {
    display: block;
    width: 100%;
    height: 220px;
    background: linear-gradient(135deg, #e9eff5 0%, #d1dce7 100%);
    overflow: hidden;
    position: relative;
}

.card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.grid-card:hover .card-img { 
    transform: scale(1.05); 
}

/* 无图时的占位 - 石油化工主题 */
.card-img-placeholder {
    width: 100%; 
    height: 100%;
    display: flex; 
    align-items: center; 
    justify-content: center;
    background: linear-gradient(135deg, #e9eff5 0%, #d1dce7 100%);
    color: var(--c-primary); 
    font-weight: 700; 
    font-size: 1.3rem;
    position: relative;
    overflow: hidden;
}

.card-img-placeholder::before {
    content: "⚡";
    position: absolute;
    font-size: 4rem;
    opacity: 0.2;
    transform: rotate(-15deg);
}

.card-body { 
    padding: 28px; 
    display: flex; 
    flex-direction: column; 
    flex: 1; 
}

.card-meta { 
    display: flex; 
    justify-content: space-between; 
    font-size: 0.85rem; 
    color: var(--text-lighter); 
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.cat-tag { 
    color: var(--c-secondary); 
    font-weight: 600; 
    padding: 4px 10px;
    background: rgba(245, 130, 32, 0.1);
    border-radius: var(--radius-sm);
}

.grid-card h3 { 
    font-size: 1.3rem; 
    margin-bottom: 14px; 
    line-height: 1.4; 
    color: var(--text-main); 
    font-weight: 600;
}

.grid-card h3 a:hover { 
    color: var(--c-accent); 
}

.excerpt { 
    font-size: 0.95rem; 
    color: var(--text-light); 
    flex-grow: 1; 
    margin-bottom: 20px; 
    line-height: 1.6;
}

.card-tags { 
    margin-top: auto; 
    padding-top: 18px; 
    border-top: 1px solid var(--border-color); 
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-badge { 
    font-size: 0.8rem; 
    color: var(--text-lighter); 
    padding: 4px 10px;
    background: rgba(209, 220, 231, 0.4);
    border-radius: 20px;
    transition: var(--transition);
}

.tag-badge:hover { 
    color: var(--c-accent); 
    background: rgba(42, 125, 225, 0.1);
    transform: translateY(-2px);
}

/* 分页 */
.pagination { 
    display: flex; 
    justify-content: center; 
    align-items: center;
    gap: 12px; 
    margin-top: 60px; 
}

.page-btn {
    width: 44px; 
    height: 44px; 
    display: flex; 
    align-items: center; 
    justify-content: center;
    border: 1px solid var(--border-color); 
    border-radius: var(--radius-md); 
    color: var(--text-main);
    background: var(--bg-white);
    font-weight: 600;
    transition: var(--transition);
}

.page-btn:hover { 
    background: var(--c-primary); 
    color: #fff; 
    border-color: var(--c-primary); 
    transform: translateY(-2px);
}

.page-current { 
    display: flex; 
    align-items: center; 
    padding: 0 16px; 
    font-weight: 700; 
    color: var(--c-primary); 
    font-size: 1.1rem;
}

/* === 文章详情页 === */
.single-post { 
    background: var(--bg-white); 
    padding: 50px; 
    border-radius: var(--radius-lg); 
    box-shadow: var(--shadow-card); 
    border: 1px solid var(--border-color);
}

.single-header { 
    border-bottom: 1px solid var(--border-color); 
    padding-bottom: 24px; 
    margin-bottom: 36px; 
}

.breadcrumb { 
    font-size: 0.9rem; 
    color: var(--text-lighter); 
    margin-bottom: 20px; 
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.breadcrumb span {
    color: var(--border-color);
}

.single-header h1 { 
    font-size: 2.4rem; 
    color: var(--text-main); 
    margin-bottom: 20px; 
    line-height: 1.3; 
    font-weight: 700;
}

.meta-line { 
    font-size: 0.95rem; 
    color: var(--text-light); 
    display: flex; 
    gap: 24px; 
    flex-wrap: wrap;
}

.meta-line span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.meta-line span::before {
    content: "•";
    color: var(--c-secondary);
    font-weight: bold;
}

/* Markdown 内容样式 */
.markdown-body { 
    color: var(--text-main); 
    font-size: 1.08rem; 
    line-height: 1.8; 
}

.markdown-body h2 { 
    font-size: 1.7rem; 
    color: var(--text-main); 
    margin: 1.8em 0 0.9em; 
    padding-bottom: 12px; 
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.markdown-body h3 { 
    font-size: 1.4rem; 
    color: var(--text-main); 
    margin: 1.6em 0 0.8em; 
    font-weight: 600;
}

.markdown-body p { 
    margin-bottom: 1.5em; 
}

.markdown-body ul, 
.markdown-body ol {
    margin-bottom: 1.5em;
    padding-left: 1.8em;
}

.markdown-body li {
    margin-bottom: 0.5em;
}

/* HR 样式 - 石油化工风格 */
.markdown-body hr {
    margin: 2em 0;
    height: 2px;
    border: none;
    background: linear-gradient(90deg, transparent, var(--c-secondary), transparent);
}

.markdown-body img { 
    max-width: 100%; 
    border-radius: var(--radius-md); 
    box-shadow: 0 8px 20px rgba(13, 43, 76, 0.1); 
    margin: 2em 0; 
}

.markdown-body a { 
    color: var(--c-accent); 
    font-weight: 500;
    border-bottom: 1px solid rgba(42, 125, 225, 0.3);
    padding-bottom: 1px;
}

.markdown-body a:hover { 
    color: var(--c-accent-light); 
    border-bottom-color: var(--c-accent-light);
}

.markdown-body blockquote { 
    border-left: 4px solid var(--c-secondary); 
    background: rgba(245, 130, 32, 0.05); 
    padding: 20px 24px; 
    color: var(--text-main); 
    margin: 2em 0; 
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
}

.markdown-body code {
    background: rgba(13, 43, 76, 0.05);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--c-primary);
}

.markdown-body pre {
    background: rgba(13, 43, 76, 0.05);
    padding: 20px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 2em 0;
    border: 1px solid var(--border-color);
}

.markdown-body pre code {
    background: transparent;
    padding: 0;
    color: inherit;
}

.post-tags-container { 
    margin-top: 50px; 
    padding-top: 24px; 
    border-top: 1px solid var(--border-color); 
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.tags-label { 
    font-weight: 700; 
    margin-right: 8px; 
    color: var(--text-main); 
    font-size: 1rem;
}

.tag-pill { 
    display: inline-block; 
    background: rgba(13, 43, 76, 0.08); 
    padding: 8px 16px; 
    font-size: 0.9rem; 
    color: var(--c-primary); 
    border-radius: 20px; 
    font-weight: 500;
    transition: var(--transition);
}

.tag-pill:hover { 
    background: var(--c-primary); 
    color: #fff; 
    transform: translateY(-2px);
}

/* 文章底部行动号召 - 禁止深色背景 */
.post-cta {
    margin-top: 50px; 
    background: linear-gradient(135deg, rgba(245, 247, 250, 0.9) 0%, rgba(240, 244, 248, 0.9) 100%);
    padding: 40px; 
    text-align: center; 
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.post-cta p { 
    font-weight: 600; 
    font-size: 1.2rem; 
    color: var(--text-main); 
    margin-bottom: 24px; 
    line-height: 1.6;
}

.small-btn { 
    font-size: 1rem; 
    padding: 12px 32px; 
    background: var(--c-secondary); 
    color: white; 
    border-radius: var(--radius-md);
    font-weight: 600;
    border: none;
    display: inline-block;
}

.small-btn:hover {
    background: #e6731c;
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(245, 130, 32, 0.3);
}

.post-navigation { 
    display: flex; 
    justify-content: space-between; 
    margin-top: 50px; 
    padding-top: 24px; 
    border-top: 1px solid var(--border-color); 
    gap: 20px;
}

.nav-prev, .nav-next { 
    display: flex; 
    flex-direction: column; 
    max-width: 48%; 
    padding: 20px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: var(--transition);
}

.nav-prev:hover, .nav-next:hover {
    background: rgba(13, 43, 76, 0.03);
    border-color: var(--border-color);
    padding-left: 24px;
    padding-right: 24px;
}

.nav-prev small, .nav-next small { 
    color: var(--text-lighter); 
    margin-bottom: 8px; 
    font-size: 0.85rem; 
    font-weight: 500;
}

.nav-prev span, .nav-next span { 
    color: var(--text-main); 
    font-weight: 600; 
    font-size: 1.05rem;
    line-height: 1.4;
}

.nav-prev:hover span, .nav-next:hover span { 
    color: var(--c-accent); 
}

/* === FAQ & Footer === */
.faq-section { 
    background: var(--bg-white); 
    padding: 80px 0; 
    border-top: 1px solid var(--border-color); 
    border-bottom: 1px solid var(--border-color);
}

.faq-item { 
    border-bottom: 1px solid var(--border-color); 
    max-width: 800px;
    margin: 0 auto;
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question { 
    padding: 24px 0; 
    cursor: pointer; 
    display: flex; 
    justify-content: space-between; 
    align-items: center;
    font-weight: 600; 
    color: var(--text-main); 
    font-size: 1.1rem;
    transition: var(--transition);
}

.faq-question:hover { 
    color: var(--c-accent); 
    padding-left: 8px;
}

.faq-question.active {
    color: var(--c-primary);
}

.faq-answer { 
    max-height: 0; 
    overflow: hidden; 
    transition: max-height 0.4s ease; 
}

.faq-answer p { 
    padding-bottom: 24px; 
    color: var(--text-light); 
    line-height: 1.7;
    padding-right: 20px;
}

.faq-question .arrow {
    font-size: 1.5rem;
    color: var(--c-secondary);
    transition: transform 0.3s;
    font-weight: 300;
    min-width: 24px;
    text-align: center;
}

.faq-question.active .arrow {
    transform: rotate(45deg);
    color: var(--c-primary);
}

/* 页脚 - 石油化工企业风格 */
.site-footer { 
    background: var(--c-primary); 
    color: rgba(255, 255, 255, 0.8); 
    padding: 80px 0 40px; 
    position: relative;
    overflow: hidden;
}

.site-footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--c-secondary), var(--c-accent));
}

.footer-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); 
    gap: 50px; 
    margin-bottom: 60px; 
}

.footer-col h4 { 
    color: #fff; 
    margin-bottom: 24px; 
    font-size: 1.2rem; 
    font-weight: 700;
    position: relative;
    padding-bottom: 12px;
}

.footer-col h4::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--c-secondary);
    border-radius: 2px;
}

.footer-col p { 
    margin-bottom: 16px; 
    font-size: 0.95rem; 
    line-height: 1.7;
    max-width: 300px;
}

.footer-col a { 
    display: block; 
    margin-bottom: 12px; 
    font-size: 0.95rem; 
    transition: var(--transition);
    color: rgba(255, 255, 255, 0.8);
}

.footer-col a:hover { 
    color: #fff; 
    padding-left: 8px;
}

.footer-bottom { 
    text-align: center; 
    padding-top: 40px; 
    border-top: 1px solid rgba(255, 255, 255, 0.1); 
    font-size: 0.9rem; 
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    margin-left: 8px;
}

.footer-bottom a:hover {
    color: #fff;
    text-decoration: underline;
}

/* === 响应式设计 === */
@media (max-width: 992px) {
    .hero-content h1 { 
        font-size: 2.6rem; 
    }
    
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .center-header h2 {
        font-size: 2.2rem;
    }
    
    .single-post {
        padding: 36px;
    }
    
    .single-header h1 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .desktop-nav { 
        display: none; 
    }
    
    .mobile-menu-trigger { 
        display: flex; 
    }
    
    .hero-section {
        padding: 100px 0 80px;
    }
    
    .hero-content h1 { 
        font-size: 2.2rem; 
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .info-card {
        padding: 32px 28px;
    }
    
    .single-post { 
        padding: 24px; 
    }
    
    .single-header h1 {
        font-size: 1.8rem;
    }
    
    .markdown-body {
        font-size: 1rem;
    }
    
    .post-navigation {
        flex-direction: column;
        gap: 24px;
    }
    
    .nav-prev, .nav-next {
        max-width: 100%;
    }
    
    .footer-grid { 
        grid-template-columns: 1fr; 
        gap: 40px;
    }
    
    .post-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-content h1 { 
        font-size: 1.9rem; 
    }
    
    .center-header h2 {
        font-size: 1.8rem;
    }
    
    .section-header h2 {
        font-size: 1.6rem;
    }
    
    .info-card {
        padding: 28px 24px;
    }
    
    .single-post {
        padding: 20px;
    }
    
    .post-cta {
        padding: 30px 24px;
    }
}