/* ===== aomenjulebu.com — 左侧文档树 + 右侧杂志正文 ===== */
:root{
  --ink:#0f1115;
  --ink-2:#171a20;
  --ink-3:#20242c;
  --line:#2b3038;
  --paper:#f6f3ec;
  --paper-2:#efeae0;
  --text:#1c1f24;
  --muted:#6b6f77;
  --gold:#b8874b;
  --gold-soft:#d9b382;
  --radius:14px;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --serif:"Noto Serif SC","Songti SC","SimSun",Georgia,serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--text);
  font-family:var(--sans);font-size:16px;line-height:1.75;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
a:hover{color:var(--gold)}
h1,h2,h3,h4{font-family:var(--serif);line-height:1.28;margin:0 0 .6em;letter-spacing:.01em}
h1{font-size:clamp(1.7rem,3.4vw,2.5rem)}
h2{font-size:clamp(1.28rem,2.2vw,1.6rem)}
h3{font-size:1.1rem}
p{margin:0 0 1.05em}
ul,ol{padding-left:1.3em;margin:0 0 1.1em}
li{margin-bottom:.4em}
.wrap{max-width:1220px;margin:0 auto;padding:0 22px}

/* ---- topbar ---- */
.topbar{background:var(--ink);color:#e9e6df;border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;gap:20px;min-height:70px;padding:10px 0;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand img{width:40px;height:40px;border-radius:10px;border:1px solid var(--line)}
.brand-txt strong{display:block;font-family:var(--serif);font-size:1.02rem;letter-spacing:.04em;color:#fff;line-height:1.3}
.brand-txt span{display:block;font-size:.72rem;color:var(--gold-soft);letter-spacing:.16em;text-transform:uppercase}
.mainnav{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
.mainnav a{padding:8px 12px;border-radius:8px;font-size:.9rem;color:#cfccc4}
.mainnav a:hover{background:var(--ink-3);color:#fff}
.mainnav a.is-active{background:var(--gold);color:#1a1206;font-weight:600}
.menubtn{display:none;margin-left:auto;background:none;border:1px solid var(--line);color:#e9e6df;border-radius:8px;padding:8px 12px;font-size:.9rem;cursor:pointer}

/* ---- layout: left tree ---- */
.shell{display:grid;grid-template-columns:250px minmax(0,1fr);gap:34px;align-items:start;padding:34px 0 56px}
.tree{position:sticky;top:18px;background:var(--ink);color:#d7d4cc;border-radius:var(--radius);padding:20px 16px;border:1px solid var(--line)}
.tree h2{font-family:var(--sans);font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;color:var(--gold-soft);margin:0 0 12px}
.tree ol{list-style:none;margin:0;padding:0;counter-reset:t}
.tree li{counter-increment:t;margin:0 0 2px}
.tree li a{display:flex;gap:10px;padding:7px 8px;border-radius:8px;font-size:.9rem}
.tree li a::before{content:counter(t,decimal-leading-zero);color:var(--gold);font-size:.74rem;font-variant-numeric:tabular-nums;padding-top:2px}
.tree li a:hover{background:var(--ink-3);color:#fff}
.tree li a.is-active{background:var(--ink-3);box-shadow:inset 3px 0 0 var(--gold);color:#fff}
.tree .tree-note{margin-top:16px;padding-top:14px;border-top:1px dashed var(--line);font-size:.8rem;color:#9a968d;line-height:1.65}

.main{min-width:0}

/* ---- hero ---- */
.hero{position:relative;border-radius:var(--radius);overflow:hidden;background:var(--ink);color:#f2efe8}
.hero img{width:100%;height:clamp(240px,38vw,420px);object-fit:cover;opacity:.62}
.hero-in{position:absolute;inset:auto 0 0 0;padding:clamp(18px,3vw,34px);background:linear-gradient(to top,rgba(9,10,13,.94),rgba(9,10,13,.55) 55%,rgba(9,10,13,0))}
.hero-kicker{display:inline-block;font-size:.74rem;letter-spacing:.22em;text-transform:uppercase;color:var(--gold-soft);margin-bottom:10px}
.hero h1{color:#fff;margin-bottom:.4em;max-width:22em}
.hero p{color:#d5d1c8;max-width:44em;margin-bottom:0}

/* ---- sections ---- */
section{margin:0 0 40px}
.sec-head{display:flex;align-items:baseline;gap:14px;border-bottom:2px solid var(--ink);padding-bottom:10px;margin-bottom:20px}
.sec-head h2{margin:0;font-size:1.24rem}
.sec-head .no{font-family:var(--sans);font-size:.76rem;letter-spacing:.18em;color:var(--gold);font-weight:700}
.sec-head .more{margin-left:auto;font-size:.84rem;color:var(--muted)}

/* stat strip */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.stat{background:#fff;padding:18px 16px}
.stat b{display:block;font-family:var(--serif);font-size:1.6rem;color:var(--ink)}
.stat span{font-size:.8rem;color:var(--muted)}

/* article list rows */
.rows{list-style:none;margin:0;padding:0}
.rows li{border-bottom:1px solid #e0dbd0;padding:14px 0}
.rows li:first-child{border-top:1px solid #e0dbd0}
.rows a{display:flex;gap:16px;align-items:baseline}
.rows .idx{font-size:.76rem;color:var(--gold);font-variant-numeric:tabular-nums;flex:0 0 2.2em}
.rows .t{font-family:var(--serif);font-size:1.02rem;flex:1 1 auto}
.rows .d{font-size:.8rem;color:var(--muted);flex:0 0 auto}
.rows a:hover .t{color:var(--gold)}

/* feature split */
.split{display:grid;grid-template-columns:1.15fr .85fr;gap:26px;align-items:center}
.split figure{margin:0}
.split img{border-radius:var(--radius);width:100%;height:100%;object-fit:cover;min-height:240px}
.split .txt h2{margin-top:0}

/* card grid (varied: 2x2 with offset) */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{background:#fff;border:1px solid #e2ddd2;border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.card img{height:170px;object-fit:cover;width:100%}
.card .body{padding:16px 18px 18px}
.card h3{margin:.2em 0 .45em}
.card p{font-size:.9rem;color:var(--muted);margin:0 0 .8em}
.card .tag{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gold)}

/* quote band */
.band{background:var(--ink);color:#e9e6df;border-radius:var(--radius);padding:clamp(22px,3vw,36px)}
.band h2{color:#fff}
.band p{color:#c9c5bc;margin-bottom:0}
.band .kicker{font-size:.74rem;letter-spacing:.2em;text-transform:uppercase;color:var(--gold-soft)}

/* faq */
.faq{display:grid;gap:12px}
.faq details{background:#fff;border:1px solid #e2ddd2;border-radius:12px;padding:14px 18px}
.faq summary{font-family:var(--serif);font-size:1rem;cursor:pointer}
.faq details[open] summary{color:var(--gold);margin-bottom:.5em}
.faq p{margin:0;font-size:.92rem;color:#43474e}

/* ---- breadcrumb ---- */
.crumb{font-size:.82rem;color:var(--muted);margin:0 0 16px}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--gold)}
.crumb span{color:#9b978f}

/* ---- category page ---- */
.cat-hero{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:26px;align-items:center;margin-bottom:28px}
.cat-hero img{border-radius:var(--radius);height:220px;width:100%;object-fit:cover}
.cat-hero h1{margin-bottom:.3em}
.lede{font-size:1.02rem;color:#43474e;max-width:46em}

/* ---- article ---- */
.article{background:#fff;border:1px solid #e2ddd2;border-radius:var(--radius);padding:clamp(20px,3.4vw,42px)}
.article h1{margin-top:0}
.byline{display:flex;flex-wrap:wrap;gap:14px;align-items:center;font-size:.84rem;color:var(--muted);border-bottom:1px solid #e6e1d6;padding-bottom:14px;margin-bottom:24px}
.byline .who{color:var(--ink);font-weight:600}
.byline .dot{color:#cfc9bc}
.article-body{max-width:46em;font-size:1.02rem}
.article-body p{line-height:1.85}
.article-body h2{margin-top:1.6em;padding-top:.2em}
.article-body h2::before{content:"";display:block;width:44px;height:3px;background:var(--gold);margin-bottom:12px;border-radius:2px}
.article-body img{border-radius:12px;margin:22px 0 8px}
.article-body figcaption{font-size:.8rem;color:var(--muted);margin-bottom:22px}
.article-body blockquote{margin:22px 0;padding:14px 20px;border-left:3px solid var(--gold);background:var(--paper-2);border-radius:0 10px 10px 0;color:#3a3e45}
.article-body a{color:#8a5f24;text-decoration:underline;text-underline-offset:.16em}
.article-body a:hover{color:var(--gold)}
.article-body table{width:100%;border-collapse:collapse;margin:20px 0;font-size:.92rem}
.article-body th,.article-body td{border:1px solid #e2ddd2;padding:9px 12px;text-align:left}
.article-body th{background:var(--paper-2)}

/* related band under article */
.related{margin-top:34px}
.related h2{font-size:1.12rem;margin-bottom:14px}
.related ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.related li a{display:block;height:100%;background:var(--paper-2);border:1px solid #e2ddd2;border-radius:12px;padding:14px 16px;font-size:.9rem}
.related li a:hover{background:#fff;border-color:var(--gold-soft)}
.related li .cat{display:block;font-size:.72rem;letter-spacing:.1em;color:var(--gold);margin-bottom:6px;text-transform:uppercase}
.backcat{display:inline-block;margin-top:26px;font-size:.88rem;border-bottom:1px solid var(--gold);padding-bottom:2px}

/* ---- footer ---- */
.sitefoot{background:var(--ink);color:#b9b5ac;padding:38px 0 26px;border-top:1px solid var(--line)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px}
.sitefoot h3{font-size:.82rem;font-family:var(--sans);letter-spacing:.16em;text-transform:uppercase;color:var(--gold-soft);margin-bottom:12px}
.sitefoot p{font-size:.86rem;line-height:1.8;margin:0 0 .5em}
.sitefoot a{color:#d3cfc6}
.sitefoot ul{list-style:none;margin:0;padding:0}
.sitefoot li{margin-bottom:6px;font-size:.86rem}
.foot-brand{display:flex;gap:12px;align-items:center;margin-bottom:12px}
.foot-brand img{width:36px;height:36px;border-radius:9px;border:1px solid var(--line)}
.foot-brand strong{color:#fff;font-family:var(--serif);letter-spacing:.05em}
.legal{border-top:1px solid var(--line);margin-top:26px;padding-top:16px;font-size:.8rem;color:#8f8b83;display:flex;flex-wrap:wrap;gap:8px 22px}

/* ---- responsive ---- */
@media (max-width:960px){
  .shell{grid-template-columns:1fr;gap:22px;padding:22px 0 40px}
  .tree{position:static}
  .split,.cat-hero{grid-template-columns:1fr}
  .related ul{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
}
@media (max-width:768px){
  body{font-size:15.5px}
  .wrap{padding:0 16px}
  .mainnav{display:none;width:100%;flex-direction:column;margin:10px 0 0;border-top:1px solid var(--line);padding-top:10px}
  .mainnav.open{display:flex}
  .mainnav a{padding:12px 10px;font-size:.95rem}
  .menubtn{display:block}
  .stats{grid-template-columns:1fr 1fr}
  .grid-2{grid-template-columns:1fr}
  .rows a{flex-wrap:wrap;gap:4px 12px}
  .rows .d{flex:1 0 100%;padding-left:2.2em}
  .hero img{height:220px}
  .article{padding:18px 16px}
  .tree ol{display:grid;grid-template-columns:1fr 1fr;gap:2px}
}
@media (max-width:480px){
  .tree ol{grid-template-columns:1fr}
  .brand-txt span{letter-spacing:.1em}
}