/* 火锅知识库 · 门户首页
   视觉基调：暖纸 / 墨黑 / 印刷朱红，与 LOGO 三方案及栏目页同一套色板。 */
:root{
  --paper:#FBFAF7;--card:#FFFFFF;--ink:#1A1A1A;--muted:#5C5C5C;--faint:#8A8578;
  --line:#E5E1D7;--line-strong:#D0CCBE;--red:#C0392B;--dark:#1F2421;
  --sand:#F5EFE3;--gold:#E7B96B;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:95px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}
p,h1,h2,h3,ul,ol{margin:0}
ul,ol{padding:0}
a{color:inherit;text-decoration:none}
svg{display:block}
img{display:block;max-width:100%}
a:focus-visible,button:focus-visible{outline:2px solid var(--red);outline-offset:3px}
.skip-link{position:fixed;top:-60px;left:12px;z-index:100;background:#fff;padding:12px 16px;border:1px solid var(--line)}
.skip-link:focus{top:12px}

/* ---------- 顶部导航 ---------- */
.site-toolbar{height:76px;background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.toolbar-inner{max-width:1328px;height:100%;margin:0 auto;padding:0 56px;display:flex;align-items:center;gap:36px}
.wordmark{display:flex;align-items:center;gap:10px;white-space:nowrap;flex:0 0 auto}
.wordmark-logo{width:38px;height:38px;border-radius:8px;flex:0 0 auto}
.wordmark-label{font-family:var(--serif);font-size:19px;font-weight:700;letter-spacing:1.2px}
.site-toolbar nav{display:flex;align-items:center;justify-content:center;gap:30px;min-width:0;flex:1 1 auto}
.site-toolbar nav a{height:76px;display:flex;align-items:center;position:relative;white-space:nowrap;font-size:14px}
.site-toolbar nav a:hover{color:var(--red)}
.site-toolbar nav a[aria-current="page"]{color:var(--red);font-weight:600}
.site-toolbar nav a[aria-current="page"]:after{content:"";position:absolute;bottom:20px;left:0;right:0;height:2px;background:var(--red)}
.home-actions{display:flex;align-items:center;gap:16px;flex:0 0 auto}
.home-login{font-size:14px;color:var(--muted);white-space:nowrap}
.home-login:hover{color:var(--red)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 24px;border-radius:6px;font-size:15px;font-weight:600;border:1px solid transparent;white-space:nowrap;transition:transform .15s ease,box-shadow .15s ease}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 16px #1a1a1a12}
.btn.is-primary{background:var(--red);color:#fff}
.btn.is-ghost{background:#fff;color:var(--ink);border-color:var(--line-strong)}
.home-btn{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 16px;border-radius:6px;background:var(--red);color:#fff;font-size:14px;font-weight:600;white-space:nowrap}
.home-btn:hover{background:#a52f22}

/* ---------- Hero ---------- */
.hero{max-width:1328px;margin:0 auto;padding:60px 56px 68px;display:grid;grid-template-columns:minmax(0,1fr) 520px;gap:48px;align-items:center}
.hero-copy{min-width:0}
.kicker{font-size:12px;letter-spacing:1.8px;color:var(--red);font-weight:600;margin:0 0 20px}
.kicker span{margin:0 6px;color:var(--line-strong)}
h1{font-family:var(--serif);font-size:50px;line-height:1.36;font-weight:600;letter-spacing:1px;margin:0 0 22px}
.hero-deck{font-size:17px;line-height:1.9;color:var(--muted);max-width:560px;margin:0 0 30px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-note{margin-top:18px;font-size:13px;color:var(--faint)}
.hero-art{min-width:0}
.hero-art svg{width:100%;height:auto;max-width:520px;margin:0 auto}

/* ---------- 栏目入口 ---------- */
.columns{background:var(--card);border-top:1px solid var(--line);padding:68px 56px 76px}
.section-head{max-width:1216px;margin:0 auto 26px;display:flex;align-items:flex-end;justify-content:space-between;gap:24px}
.section-head .kicker{margin-bottom:10px}
h2{font-family:var(--serif);font-size:32px;font-weight:600;line-height:1.35}
.section-note{font-size:14px;color:var(--muted)}
.col-grid{max-width:1216px;margin:0 auto;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.col-card{display:flex;flex-direction:column;gap:14px;min-height:250px;padding:24px;background:var(--paper);border:1px solid var(--line);border-radius:8px;transition:border-color .15s ease,transform .15s ease}
.col-card:hover{border-color:var(--line-strong);transform:translateY(-2px)}
.col-icon svg{width:40px;height:40px;color:var(--red)}
.col-card h3{font-family:var(--serif);font-size:22px;font-weight:600;line-height:1.4}
.col-card p{font-size:14px;line-height:1.75;color:var(--muted);flex:1 1 auto}
.col-more{font-size:13px;font-weight:600;color:var(--red)}
.col-more i{font-style:normal;margin-left:4px}

/* ---------- 会员权益 ---------- */
.membership{background:var(--sand);padding:68px 56px 76px}
.member-note{max-width:1216px;margin:-8px auto 26px;font-size:15px;color:var(--muted)}
.tiers{max-width:1216px;margin:0 auto;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.tier{padding:28px;border-radius:8px;display:flex;flex-direction:column;gap:16px;min-height:280px}
.tier-silver{background:var(--card);border:1px solid var(--line)}
.tier-gold{background:var(--dark)}
.tier-tag{font-size:12px;letter-spacing:1.4px;color:var(--faint);font-weight:600}
.tier-tag span{margin:0 4px;opacity:.6}
.tier-gold .tier-tag{color:var(--gold)}
.tier h3{font-family:var(--serif);font-size:26px;font-weight:600}
.tier-gold h3{color:#FFF6E8}
.tier ul{list-style:none;font-size:14px;line-height:2;flex:1 1 auto}
.tier li:before{content:"· ";margin-right:6px;color:var(--red)}
.tier-gold ul{color:#CFC9BC}
.tier-gold li:before{color:var(--gold)}
.tier .btn{align-self:flex-start;min-height:42px;padding:0 22px;font-size:14px}
.tier-gold .btn.is-primary{background:var(--red)}
.steps{max-width:1216px;margin:20px auto 0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.steps li{background:var(--card);border-radius:6px;padding:16px 18px;display:flex;flex-direction:column;gap:6px}
.steps span{font-size:12px;color:var(--red);font-weight:600;letter-spacing:1px}
.steps strong{font-size:16px;font-weight:600}

/* ---------- 页脚 ---------- */
.home-footer{background:var(--card);border-top:1px solid var(--line);padding:44px 56px 32px}
.footer-top{max-width:1216px;margin:0 auto 28px;display:flex;gap:80px;align-items:flex-start}
.footer-brand{flex:1 1 360px;min-width:0}
.footer-logo{display:flex;align-items:center;gap:10px}
.footer-logo img{width:28px;height:28px;border-radius:7px}
.footer-logo span{font-family:var(--serif);font-size:18px}
.footer-brand p{font-size:14px;color:var(--muted);margin-top:14px}
.footer-col{display:flex;flex-direction:column;gap:9px;min-width:140px}
.footer-col h3{font-size:13px;letter-spacing:1.2px;color:var(--faint);font-weight:600;margin-bottom:4px}
.footer-col a{font-size:14px}
.footer-col a:hover{color:var(--red)}
.footer-bottom{max-width:1216px;margin:0 auto;padding-top:22px;border-top:1px solid var(--line);display:flex;align-items:center;gap:20px;flex-wrap:wrap;font-size:12px;color:var(--faint)}
.footer-bottom a:hover{color:var(--red)}
.footer-bottom .icp-filing{margin-left:auto}
.icp-filing a{display:inline-flex;align-items:center;gap:6px;color:inherit;text-decoration:none}
.icp-icon{width:14px;height:14px;flex:0 0 auto}

/* ---------- 响应式 ---------- */
@media(max-width:1100px){
  .toolbar-inner{padding:0 32px;gap:20px}
  .site-toolbar nav{gap:18px}
  .hero{grid-template-columns:minmax(0,1fr) 400px;padding:52px 32px 60px;gap:32px}
  h1{font-size:42px}
  .columns,.membership{padding-left:32px;padding-right:32px}
  .col-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .home-footer{padding-left:32px;padding-right:32px}
}
@media(max-width:720px){
  html{scroll-padding-top:120px}
  .site-toolbar{height:auto}
  .toolbar-inner{padding:10px 20px 0;display:grid;grid-template-columns:minmax(0,1fr) auto;column-gap:12px;row-gap:0}
  .wordmark{grid-row:1;grid-column:1}
  .wordmark-logo{width:32px;height:32px}
  .wordmark-label{font-size:16px}
  .home-actions{grid-row:1;grid-column:2;gap:8px}
  /* 老会员在移动端也必须能一键登录，不能只留页脚入口 */
  .home-login{display:inline-flex;align-items:center;font-size:12px;white-space:nowrap}
  .home-btn{min-height:34px;padding:0 12px;font-size:13px}
  .site-toolbar nav{grid-row:2;grid-column:1/-1;justify-content:flex-start;gap:0;min-width:0;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}
  .site-toolbar nav::-webkit-scrollbar{display:none}
  .site-toolbar nav a{flex:0 0 auto;height:42px;font-size:12px;padding:0 10px}
  .site-toolbar nav a[aria-current="page"]:after{bottom:6px}
  .hero{display:flex;flex-direction:column;padding:36px 20px 44px;gap:28px}
  h1{font-size:34px;line-height:1.4}
  .hero-deck{font-size:15px;line-height:1.85}
  .hero-cta .btn{flex:1 1 auto}
  .columns,.membership{padding:44px 20px 52px}
  .section-head{display:block}
  .section-note{margin-top:10px}
  h2{font-size:26px}
  .col-grid{grid-template-columns:minmax(0,1fr);gap:14px}
  .col-card{min-height:0}
  .tiers{grid-template-columns:minmax(0,1fr)}
  .tier{min-height:0}
  .steps{grid-template-columns:minmax(0,1fr);gap:10px}
  .home-footer{padding:36px 20px 28px}
  .footer-top{flex-wrap:wrap;gap:28px}
  .footer-brand{flex:1 1 100%}
  .footer-bottom{gap:12px}
  .footer-bottom .icp-filing{margin-left:0;flex:1 1 100%}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}html{scroll-behavior:auto}}

/* 局部轻量毛玻璃：首页顶部导航 + 导航文字加粗 */
.site-toolbar{background:rgba(255,255,255,.80);backdrop-filter:blur(16px) saturate(1.25);-webkit-backdrop-filter:blur(16px) saturate(1.25)}
.site-toolbar nav a{font-weight:600}
.site-toolbar nav a[aria-current="page"]{font-weight:700}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
  .site-toolbar{background:rgba(255,255,255,.97)}
}

/* 全站页脚「网站地图」链接（自动生成，勿手改） */
.icp-filing .icp-sep{opacity:.55;padding:0 3px}
.icp-filing .footer-sitemap-link{white-space:nowrap}