/* ===== 主题标签页样式（tag 聚合页 + tags 总览页）===== */
:root{
  --bg:#0B0B12;
  --card:#14141F;
  --footer:#0E0E17;
  --card-border:rgba(255,255,255,0.07);
  --line:rgba(255,255,255,0.07);
  --text:#F5F5F7;
  --text-2:#A6A6BD;
  --text-3:#9999B2;
  --text-4:#808099;
  --chip:#C7C7D9;
  --purple:#8B5CF6;
  --green:#22C55E;
  --brown:#B08D57;
  --pi:#E5E7EB;
  --g-purple:rgba(139,92,246,.14);
  --g-green:rgba(34,197,94,.14);
  --g-brown:rgba(176,141,87,.14);
  --g-pi:rgba(229,231,235,.12);
  --border-soft:rgba(255,255,255,.07);
  --nav-bg:rgba(11,11,18,.92);
  --radius:18px;
  --shadow:0 12px 24px rgba(0,0,0,.35);
}
:root[data-theme="light"]{
  --bg:#FAFAFB;
  --card:#FFFFFF;
  --footer:#F2F2F5;
  --card-border:rgba(0,0,0,.08);
  --line:rgba(0,0,0,.08);
  --text:#1A1A24;
  --text-2:#4A4A5E;
  --text-3:#66667E;
  --text-4:#8A8AA0;
  --chip:#3A3A4A;
  --border-soft:rgba(0,0,0,.08);
  --nav-bg:rgba(255,255,255,.92);
  --pi:#111827;
  --g-pi:rgba(17,24,39,.12);
  --shadow:0 12px 24px rgba(0,0,0,.08);
}
*{margin:0;padding:0;box-sizing:border-box;}
body{
  background:var(--bg);color:var(--text);
  font-family:"Noto Sans SC","Inter",sans-serif;
  -webkit-font-smoothing:antialiased;line-height:1.6;
}
a{text-decoration:none;color:inherit;}
.wrap{width:1200px;max-width:calc(100% - 64px);margin:0 auto;}
.kicker{font-family:"Space Grotesk",sans-serif;font-weight:700;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--purple);}

/* ===== Accent（正文与页脚共用）===== */
.accent-purple{--accent:var(--purple);--g-accent:var(--g-purple);}
.accent-green{--accent:var(--green);--g-accent:var(--g-green);}
.accent-pi{--accent:var(--pi);--g-accent:var(--g-pi);}

/* ===== Navbar（与全站一致）===== */
.nav{position:sticky;top:0;z-index:50;background:var(--nav-bg);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);}
.nav-inner{height:76px;display:flex;align-items:center;justify-content:space-between;}
.logo{display:flex;align-items:center;gap:10px;font-family:"Space Grotesk",sans-serif;font-weight:700;font-size:20px;color:var(--text);}
.logo-mark{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,#8B5CF6,#B08D57);color:#fff;display:flex;align-items:center;justify-content:center;}
.nav-links{display:flex;align-items:center;gap:32px;font-size:15px;font-weight:500;color:var(--text-2);}
.nav-links a:hover{color:var(--text);transition:color .2s;}
.nav-right{display:flex;align-items:center;gap:14px;}
.theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--text-2);cursor:pointer;transition:color .2s,border-color .2s;}
.theme-toggle:hover{color:var(--text);border-color:var(--purple);}
.theme-toggle svg{display:none;}
.theme-toggle[data-theme-now="dark"] .icon-moon{display:block;}
.theme-toggle[data-theme-now="light"] .icon-sun{display:block;}
.nav-cta{background:var(--purple);color:#fff;font-family:"Inter";font-weight:600;font-size:15px;padding:10px 20px;border-radius:10px;}
.nav-cta:hover{filter:brightness(1.1);transition:filter .2s;}

/* ===== Breadcrumb ===== */
.breadcrumb{padding:24px 0 0;font-size:13px;color:var(--text-3);}
.breadcrumb a{color:var(--text-2);}
.breadcrumb a:hover{color:var(--text);}
.breadcrumb span{color:var(--text-4);margin:0 8px;}

/* ===== Tag Hero ===== */
.tag-hero{display:flex;justify-content:center;padding:64px 0 8px;}
.tag-hero .wrap{display:flex;flex-direction:column;align-items:center;text-align:center;gap:14px;}
.tag-title{font-size:44px;font-weight:700;letter-spacing:-.01em;}
.tag-desc{font-size:16px;color:var(--text-2);max-width:680px;line-height:1.8;}
.tag-keywords{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:6px;}
.tag-chip{font-size:12.5px;color:var(--chip);background:var(--border-soft);padding:5px 12px;border-radius:999px;border:1px solid var(--line);}

/* ===== Tag Section ===== */
.tag-section{display:flex;justify-content:center;padding:64px 0 0;}
.tag-section-head{display:flex;align-items:baseline;gap:12px;margin-bottom:28px;}
.head-title{font-size:26px;font-weight:700;}
.tag-count{font-family:"Space Grotesk",sans-serif;font-size:13px;color:var(--text-4);}

/* ===== 课程卡片（复用首页样式）===== */
.cards-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;}
.course-card{background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;display:flex;flex-direction:column;gap:16px;transition:border-color .2s,transform .2s;}
.course-card:hover{border-color:var(--purple);transform:translateY(-3px);}
.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:8px;font-size:13px;font-weight:500;width:fit-content;background:var(--g-purple);color:var(--purple);}
.course-title{font-size:20px;font-weight:700;}
.course-desc{font-size:14px;color:var(--text-2);line-height:1.7;}
.meta{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-3);}
.dot{width:6px;height:6px;border-radius:50%;background:var(--purple);display:inline-block;}
.divider{height:1px;background:var(--line);}
.topics{display:flex;flex-wrap:wrap;gap:8px;}
.topic{font-size:12px;font-weight:500;color:var(--chip);background:var(--border-soft);padding:5px 10px;border-radius:7px;}
.card-link{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--purple);}
.card-link .arrow{font-family:"Inter";font-weight:600;}

/* ===== 文章列表（复用博客页样式）===== */
.blog-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:16px;}
.post-card{display:flex;flex-direction:column;gap:10px;background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px 30px;transition:border-color .2s,transform .2s;}
.post-card:hover{border-color:var(--purple);transform:translateY(-3px);}
.post-date{font-family:"Space Grotesk",sans-serif;font-size:13px;letter-spacing:.06em;color:var(--text-3);}
.post-card h2{font-size:22px;font-weight:700;}
.post-card h2 a:hover{color:var(--purple);}
.post-card p{font-size:14.5px;color:var(--text-2);line-height:1.7;}
.post-more{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--purple);margin-top:4px;}
.post-more .arrow{font-family:"Inter";font-weight:600;}

/* ===== 相关主题互链 ===== */
.related-tags{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:120px;}
.tag-link{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--purple);background:var(--g-purple);border:1px solid var(--line);padding:9px 18px;border-radius:999px;transition:border-color .2s,transform .2s;}
.tag-link:hover{border-color:var(--purple);transform:translateY(-2px);}
.tag-link .arrow{font-family:"Inter";font-weight:600;}
.tag-link-all{color:var(--text-2);background:var(--border-soft);}

/* ===== Tags 总览页 ===== */
.tags-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px;padding-bottom:120px;}
.tag-card{display:flex;flex-direction:column;gap:10px;background:var(--card);border:1px solid var(--card-border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;transition:border-color .2s,transform .2s;}
.tag-card:hover{border-color:var(--purple);transform:translateY(-3px);}
.tag-card-name{font-size:20px;font-weight:700;}
.tag-card-desc{font-size:13.5px;color:var(--text-2);line-height:1.7;}
.tag-card .go{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--purple);margin-top:6px;}
.tag-card .go .arrow{font-family:"Inter";font-weight:600;}

/* ===== 文章页 / 课程页标签互链 ===== */
.post-tags{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:36px;}
.post-tags-label{font-size:13px;color:var(--text-3);}
.post-tags .tag-link{font-size:12.5px;padding:5px 14px;color:var(--text-2);background:var(--border-soft);}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;}
.hero-tags .tag-link{font-size:12.5px;padding:5px 14px;color:var(--text-2);background:var(--border-soft);}

@media (max-width:760px){
  .tag-title{font-size:32px;}
  .cards-row{grid-template-columns:1fr;}
  .tags-grid{grid-template-columns:1fr;}
}

/* ===== Footer（与全站一致）===== */
.footer{background:var(--footer);border-top:1px solid var(--line);}
.footer-inner{width:1200px;max-width:calc(100% - 64px);margin:0 auto;padding:72px 0 40px;display:flex;flex-direction:column;gap:40px;}
.footer-top{display:flex;justify-content:space-between;gap:48px;flex-wrap:wrap;}
.footer-brand{width:400px;max-width:100%;display:flex;flex-direction:column;gap:16px;}
.footer-brand .logo{font-size:19px;}
.footer-brand p{font-size:14px;color:var(--text-3);max-width:320px;}
.link-cols{display:flex;gap:72px;flex-wrap:wrap;}
.link-col{display:flex;flex-direction:column;gap:14px;}
.link-col b{font-size:15px;font-weight:700;color:var(--text);}
.link-col a{font-size:14px;color:var(--text-4);}
.link-col a:hover{color:var(--text-2);transition:color .2s;}
.footer-divider{height:1px;background:var(--line);}
.footer-bottom{display:flex;justify-content:center;font-size:13px;color:var(--text-4);}

/* ===== Responsive ===== */
@media(max-width:1024px){.nav-links{display:none;}}