/* greetearth.com - CSS */
:root{--teal:#0D9488;--teal-dark:#0F766E;--amber:#F59E0B;--amber-light:#FCD34D;--bg:#F8FAFC;--bg-card:#FFFFFF;--text:#1E293B;--text-muted:#64748B;--border:#E2E8F0;--shadow:0 2px 8px rgba(0,0,0,.08);--radius:8px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'PingFang SC','Microsoft YaHei',Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7}
a{color:var(--teal);text-decoration:none;transition:color .2s}
a:hover{color:var(--teal-dark)}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 1.25rem}

/* Header */
.site-header{background:var(--bg-card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:.875rem 0;gap:1.5rem}
.site-logo{display:flex;align-items:center;gap:.625rem;flex-shrink:0}
.site-logo img{height:36px;width:auto}
.site-logo-text{font-weight:700;font-size:1.125rem;color:var(--text)}
.main-nav{display:flex;align-items:center;gap:.25rem;list-style:none;flex-wrap:wrap}
.main-nav a{display:block;padding:.5rem .875rem;border-radius:var(--radius);font-size:.9375rem;color:var(--text);transition:background .2s,color .2s}
.main-nav a:hover,.main-nav a[aria-current="page"]{background:var(--teal);color:#fff}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:.5rem;font-size:1.5rem;color:var(--text)}
@media(max-width:768px){
.nav-toggle{display:block}
.main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--bg-card);border-top:1px solid var(--border);flex-direction:column;padding:.5rem 0;box-shadow:0 4px 12px rgba(0,0,0,.1)}
.main-nav.is-open{display:flex}
.main-nav a{padding:.875rem 1.25rem;border-radius:0}
}

/* Layout */
.page-layout{display:grid;grid-template-columns:240px 1fr;gap:2rem;padding:2rem 0;align-items:start}
@media(max-width:900px){.page-layout{grid-template-columns:1fr}}

/* Sidebar */
.sidebar{position:sticky;top:5rem}
.sidebar-nav{background:var(--bg-card);border-radius:var(--radius);padding:1rem 0;border:1px solid var(--border);box-shadow:var(--shadow)}
.sidebar-nav h3{font-size:.8125rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);padding:.5rem 1.25rem .25rem;margin-bottom:.5rem}
.sidebar-nav a{display:flex;align-items:center;gap:.5rem;padding:.625rem 1.25rem;color:var(--text);font-size:.9375rem;transition:background .2s,color .2s}
.sidebar-nav a:hover,.sidebar-nav a[aria-current="page"]{background:rgba(13,148,136,.08);color:var(--teal);border-right:3px solid var(--teal)}
.sidebar-nav a .icon{margin-right:.25rem}

/* Content area */
.content{}
.content-header{margin-bottom:1.5rem}
.content-header h1{font-size:1.75rem;font-weight:700;margin-bottom:.5rem}
.breadcrumb{font-size:.875rem;color:var(--text-muted);margin-bottom:.5rem}
.breadcrumb a{color:var(--teal)}
.breadcrumb span{margin:0 .25rem}

/* Article cards */
.article-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.25rem;margin-bottom:2rem}
.article-card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);overflow:hidden;box-shadow:var(--shadow);transition:box-shadow .2s,transform .2s}
.article-card:hover{box-shadow:0 6px 20px rgba(0,0,0,.12);transform:translateY(-2px)}
.article-card img{width:100%;height:180px;object-fit:cover}
.article-card-body{padding:1rem}
.article-card-body h2{font-size:1.0625rem;margin-bottom:.5rem;line-height:1.4}
.article-card-body p{font-size:.875rem;color:var(--text-muted);line-height:1.6}
.article-card-meta{font-size:.8125rem;color:var(--text-muted);padding:.75rem 1rem;border-top:1px solid var(--border);display:flex;justify-content:space-between}
.article-list{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);overflow:hidden}
.article-list-item{display:flex;gap:1rem;padding:1rem;border-bottom:1px solid var(--border);align-items:center}
.article-list-item:last-child{border-bottom:none}
.article-list-item img{width:120px;height:80px;object-fit:cover;border-radius:6px;flex-shrink:0}
.article-list-item .item-body h2{font-size:1rem;margin-bottom:.25rem}
.article-list-item .item-body p{font-size:.8125rem;color:var(--text-muted)}

/* Article page */
.article-page{display:grid;grid-template-columns:1fr 280px;gap:2rem;align-items:start}
@media(max-width:1000px){.article-page{grid-template-columns:1fr}}
.article-main{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:2rem;box-shadow:var(--shadow)}
.article-main h1{font-size:1.625rem;line-height:1.4;margin-bottom:.75rem}
.article-meta-bar{font-size:.875rem;color:var(--text-muted);padding-bottom:1rem;border-bottom:1px solid var(--border);margin-bottom:1.25rem;display:flex;flex-wrap:wrap;gap:.75rem}
.article-body{font-size:1rem;line-height:1.8}
.article-body h2{font-size:1.25rem;margin:1.75rem 0 .75rem;color:var(--text)}
.article-body p{margin-bottom:1rem}
.article-body ul,.article-body ol{padding-left:1.5rem;margin-bottom:1rem}
.article-body li{margin-bottom:.375rem}
.article-body img{border-radius:6px;margin:1.25rem 0;box-shadow:0 2px 8px rgba(0,0,0,.1)}
.article-body strong{color:var(--teal-dark)}
.article-body .highlight-box{background:rgba(13,148,136,.06);border-left:4px solid var(--teal);padding:1rem 1.25rem;border-radius:0 var(--radius) var(--radius) 0;margin:1.25rem 0}
.article-related{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:1.25rem;box-shadow:var(--shadow);position:sticky;top:5rem}
.article-related h3{font-size:1rem;margin-bottom:1rem;padding-bottom:.5rem;border-bottom:2px solid var(--teal)}
.article-related ul{list-style:none}
.article-related li{margin-bottom:.875rem}
.article-related a{display:block;font-size:.875rem;padding:.5rem .75rem;border-radius:6px;background:rgba(13,148,136,.04);color:var(--text);transition:background .2s}
.article-related a:hover{background:rgba(13,148,136,.12);color:var(--teal)}

/* Section blocks (homepage) */
section{margin-bottom:2rem}
.section-title{font-size:1.25rem;font-weight:700;margin-bottom:1rem;padding-bottom:.5rem;border-bottom:2px solid var(--amber);display:flex;align-items:center;gap:.5rem}
.section-title .icon{color:var(--amber)}

/* Stats bar */
.stats-bar{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:1rem;margin-bottom:2rem}
.stat-card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);padding:1.25rem;text-align:center;box-shadow:var(--shadow)}
.stat-card .num{font-size:1.5rem;font-weight:700;color:var(--teal)}
.stat-card .label{font-size:.8125rem;color:var(--text-muted);margin-top:.25rem}

/* Footer */
.site-footer{background:var(--text);color:#94A3B8;padding:2rem 0 1.5rem;margin-top:3rem}
.footer-inner{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:2rem}
.footer-col h4{color:#E2E8F0;font-size:.9375rem;margin-bottom:.75rem;font-weight:600}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:.375rem}
.footer-col a{color:#94A3B8;font-size:.875rem}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #334155;margin-top:1.5rem;padding-top:1rem;text-align:center;font-size:.8125rem}

/* Utilities */
.tag{display:inline-block;background:rgba(13,148,136,.1);color:var(--teal);padding:.125rem .625rem;border-radius:999px;font-size:.8125rem}
.btn{display:inline-block;padding:.625rem 1.25rem;background:var(--teal);color:#fff;border-radius:var(--radius);font-size:.9375rem;font-weight:600;transition:background .2s}
.btn:hover{background:var(--teal-dark);color:#fff}
.btn-outline{display:inline-block;padding:.625rem 1.25rem;border:2px solid var(--teal);color:var(--teal);border-radius:var(--radius);font-size:.9375rem;font-weight:600;transition:background .2s,color .2s}
.btn-outline:hover{background:var(--teal);color:#fff}
.text-center{text-align:center}
.mt-2{margin-top:.5rem}
.mb-2{margin-bottom:.5rem}