/* ========================================
   图文案例站 - 样式表
   www.jijiadoushou.cn
   版式设计 | 视觉案例 | 创意灵感
   ======================================== */

/* CSS 变量 */
:root {
  --accent-color: #00bcd4;
  --accent-dark: #0097a7;
  --text-primary: #1a1a1a;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f5f5f5;
  --bg-dark: #1a1a1a;
  --border-color: #e0e0e0;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.12);
  --transition: all 0.3s ease;
}

/* 重置 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-font-smoothing:antialiased}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;line-height:1.6;color:var(--text-primary);background:var(--bg-primary)}
a{text-decoration:none;color:inherit;transition:var(--transition)}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}

/* ========================================
   布局组件
   ======================================== */

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* 分屏布局 */
.split-screen{display:grid;grid-template-columns:1fr 1fr;min-height:calc(100vh - 200px)}
.split-left,.split-right{display:flex;flex-direction:column;justify-content:center;padding:64px}
.split-left{background:var(--bg-secondary)}
.split-right{background:var(--bg-primary)}

/* 三栏布局 */
.three-col{grid-template-columns:repeat(3,1fr)}

/* 两栏布局 */
.two-col{grid-template-columns:repeat(2,1fr)}

/* 网格布局 */
.grid{display:grid;gap:24px}

/* ========================================
   页头
   ======================================== */
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,0.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--border-color)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-size:1.5rem;font-weight:700;color:var(--text-primary)}
.logo span{color:var(--accent-color)}
.nav{display:flex;gap:32px}
.nav a{font-size:0.875rem;font-weight:500;color:var(--text-secondary);position:relative}
.nav a:hover{color:var(--accent-color)}
.nav a.active{color:var(--accent-color)}
.nav a.active::after{content:"";position:absolute;bottom:-4px;left:0;width:100%;height:2px;background:var(--accent-color)}

/* ========================================
   面包屑
   ======================================== */
.breadcrumb{padding:16px 0;font-size:0.875rem;color:var(--text-muted)}
.breadcrumb a{color:var(--text-secondary)}
.breadcrumb a:hover{color:var(--accent-color)}
.breadcrumb span{margin:0 8px}

/* ========================================
   分屏内容
   ======================================== */
.split-content{max-width:480px}
.split-label{font-size:0.75rem;font-weight:600;text-transform:uppercase;letter-spacing:2px;color:var(--accent-color);margin-bottom:16px}
.split-title{font-size:2.5rem;font-weight:700;line-height:1.2;margin-bottom:24px;color:var(--text-primary)}
.split-desc{font-size:1.125rem;color:var(--text-secondary);margin-bottom:32px;line-height:1.8}
.split-image{width:100%;height:400px;object-fit:cover;border-radius:8px;box-shadow:var(--shadow)}

/* ========================================
   按钮
   ======================================== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;font-size:0.875rem;font-weight:600;border-radius:4px;transition:var(--transition);cursor:pointer;border:none}
.btn-primary{background:var(--accent-color);color:#fff}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-outline{background:transparent;color:var(--accent-color);border:2px solid var(--accent-color)}
.btn-outline:hover{background:var(--accent-color);color:#fff}

/* ========================================
   文章列表
   ======================================== */
.section{padding:48px 0}
.section-title{font-size:1.25rem;font-weight:600;margin-bottom:24px;color:var(--text-primary);display:flex;align-items:center;gap:12px}
.section-title::before{content:"";width:4px;height:20px;background:var(--accent-color);border-radius:2px}

.article-list{display:flex;flex-direction:column;gap:16px}
.article-item{padding:16px;background:var(--bg-secondary);border-radius:8px;transition:var(--transition)}
.article-item:hover{background:var(--bg-primary);box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.article-item a{display:block}
.article-title{font-size:1rem;font-weight:600;color:var(--text-primary);margin-bottom:8px}
.article-meta{font-size:0.75rem;color:var(--text-muted);display:flex;gap:16px}

/* 三栏文章网格 */
.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.article-card{background:var(--bg-secondary);border-radius:12px;overflow:hidden;transition:var(--transition)}
.article-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.article-card-img{height:160px;background:linear-gradient(135deg,var(--bg-secondary) 0%,var(--border-color) 100%);display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:0.875rem}
.article-card-body{padding:20px}
.article-card-title{font-size:1rem;font-weight:600;margin-bottom:8px;color:var(--text-primary)}
.article-card-desc{font-size:0.875rem;color:var(--text-secondary);line-height:1.6}

/* ========================================
   分类列表
   ======================================== */
.category-list{display:flex;flex-direction:column;gap:12px}
.category-item{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--bg-secondary);border-radius:8px;transition:var(--transition)}
.category-item:hover{background:var(--accent-color);color:#fff}
.category-item:hover .category-count{color:rgba(255,255,255,0.7)}
.category-name{font-weight:500}
.category-count{font-size:0.875rem;color:var(--text-muted)}

/* ========================================
   文章详情
   ======================================== */
.article-content{max-width:720px;margin:0 auto;padding:48px 0}
.article-header{margin-bottom:48px}
.article-h1{font-size:2rem;font-weight:700;line-height:1.3;margin-bottom:16px}
.article-info{display:flex;gap:24px;font-size:0.875rem;color:var(--text-muted);margin-bottom:24px}
.article-cover{width:100%;height:400px;object-fit:cover;border-radius:12px;margin-bottom:32px}
.article-body{font-size:1.125rem;line-height:1.9;color:var(--text-secondary)}
.article-body p{margin-bottom:24px}
.article-body h2{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin:48px 0 24px}
.article-body h3{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin:32px 0 16px}
.article-body img{width:100%;border-radius:8px;margin:24px 0}
.article-body blockquote{border-left:4px solid var(--accent-color);padding-left:24px;margin:24px 0;font-style:italic;color:var(--text-muted)}

/* 对比展示 */
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;margin:48px 0}
.compare-item{background:var(--bg-secondary);padding:32px;border-radius:12px}
.compare-label{font-size:0.75rem;font-weight:600;text-transform:uppercase;letter-spacing:1px;color:var(--accent-color);margin-bottom:12px}
.compare-title{font-size:1.5rem;font-weight:700;margin-bottom:16px}
.compare-content{font-size:1rem;line-height:1.8;color:var(--text-secondary)}

/* ========================================
   推荐区域
   ======================================== */
.recommended{background:var(--bg-secondary);padding:48px 0}
.recommended-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.recommended-item{display:flex;align-items:center;gap:16px;padding:20px;background:var(--bg-primary);border-radius:8px;transition:var(--transition)}
.recommended-item:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.recommended-thumb{width:80px;height:80px;background:var(--bg-secondary);border-radius:8px;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:0.75rem}
.recommended-title{font-size:0.9375rem;font-weight:600;margin-bottom:4px;color:var(--text-primary)}
.recommended-cat{font-size:0.75rem;color:var(--accent-color)}

/* ========================================
   页脚
   ======================================== */
.footer{background:var(--bg-dark);color:#fff;padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;margin-bottom:48px}
.footer-brand{font-size:1.25rem;font-weight:700;margin-bottom:16px}
.footer-brand span{color:var(--accent-color)}
.footer-desc{font-size:0.875rem;color:rgba(255,255,255,0.6);line-height:1.8}
.footer-title{font-size:0.875rem;font-weight:600;margin-bottom:16px;text-transform:uppercase;letter-spacing:1px}
.footer-links{display:flex;flex-direction:column;gap:12px}
.footer-links a{font-size:0.875rem;color:rgba(255,255,255,0.6)}
.footer-links a:hover{color:var(--accent-color)}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding-top:24px;display:flex;justify-content:space-between;align-items:center;font-size:0.875rem;color:rgba(255,255,255,0.4)}

/* ========================================
   404 页面
   ======================================== */
.error-page{min-height:calc(100vh - 200px);display:flex;align-items:center;justify-content:center;text-align:center;padding:48px}
.error-code{font-size:8rem;font-weight:700;color:var(--accent-color);line-height:1;margin-bottom:16px}
.error-title{font-size:1.5rem;font-weight:600;margin-bottom:16px}
.error-desc{color:var(--text-secondary);margin-bottom:32px}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width:1024px){
  .split-screen{grid-template-columns:1fr}
  .split-left,.split-right{padding:48px 24px}
  .split-content{max-width:100%}
  .split-image{height:300px}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:768px){
  .nav{display:none}
  .article-grid{grid-template-columns:1fr}
  .recommended-grid{grid-template-columns:1fr}
  .compare-grid{grid-template-columns:1fr}
  .split-title{font-size:1.75rem}
  .split-desc{font-size:1rem}
  .article-h1{font-size:1.5rem}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .error-code{font-size:5rem}
}

@media (max-width:480px){
  .container{padding:0 16px}
  .split-left,.split-right{padding:32px 16px}
  .btn{width:100%;justify-content:center}
}