:root{
  --navy:#10275e;
  --ink:#1e2a3d;
  --muted:#6f7887;
  --paper:#f5edd4;
  --paper-2:#fbf7e9;
  --grid:rgba(53,84,56,.10);
  --line:#1d326d;
  --blue:#5d92df;
  --blue-2:#d9e9ff;
  --orange:#f3b35c;
  --green:#83c879;
  --purple:#c9a3e5;
  --pink:#efa2b7;
  --max:1180px;
  --reading:760px;
  --radius:16px;
  --shadow:0 16px 45px rgba(24,34,55,.12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);font-family:Georgia,'Times New Roman','Noto Serif SC','Songti SC',serif;background:
  linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px),
  radial-gradient(circle at 85% 0%,rgba(83,132,204,.11),transparent 28%),
  linear-gradient(180deg,#f7f1df 0%,#f1e8cc 100%);
  background-size:24px 24px,24px 24px,auto,auto; min-height:100vh}
body::before{content:"";position:fixed;inset:0;pointer-events:none;background:linear-gradient(90deg,transparent 49.85%,rgba(24,50,109,.045) 50%,transparent 50.15%);opacity:.55}
a{color:inherit}
.container{max-width:var(--max);margin:0 auto;padding:0 28px}
.mono{font-family:'SFMono-Regular','Cascadia Code',Consolas,monospace;letter-spacing:.03em}
.site-header{padding:28px 0 18px;position:relative;z-index:2}
.brand-row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;border-bottom:2px solid var(--navy);padding-bottom:16px}
.brand{display:flex;align-items:baseline;gap:14px;color:var(--navy)}
.brand-en{font-weight:700;font-size:clamp(20px,3vw,31px);letter-spacing:-.02em}
.brand-zh{font-size:16px;letter-spacing:.16em}
.date{font-size:12px;color:var(--muted)}
.home-hero{padding:44px 0 30px;display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:end}
.kicker{font-family:'SFMono-Regular',Consolas,monospace;color:var(--navy);font-size:12px;text-transform:uppercase;letter-spacing:.12em}
.hero-title{font-size:clamp(40px,6vw,74px);line-height:.97;margin:14px 0 18px;color:var(--navy);max-width:760px}
.hero-title em{font-style:italic;font-weight:400}
.hero-sub{font-size:18px;line-height:1.65;max-width:720px;color:#495365;margin:0}
.hero-note{justify-self:end;max-width:360px;border-left:1px dashed var(--navy);padding-left:24px;color:#566172;font-size:14px;line-height:1.75}
.hero-note strong{color:var(--navy)}
.meta-strip{display:flex;gap:14px;flex-wrap:wrap;margin-top:22px}
.pill{border:1px solid rgba(16,39,94,.30);padding:7px 11px;border-radius:999px;background:rgba(255,255,255,.4);font-family:'SFMono-Regular',Consolas,monospace;font-size:11px;color:var(--navy)}
.toc-title{display:flex;align-items:center;gap:14px;margin:14px 0 18px}.toc-title h2{font-size:17px;margin:0;color:var(--navy)}.toc-rule{height:1px;background:rgba(16,39,94,.30);flex:1}
.issue-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;padding-bottom:48px}
.issue-card{position:relative;text-decoration:none;border:1px solid rgba(16,39,94,.22);background:rgba(255,251,237,.82);box-shadow:0 8px 28px rgba(36,44,60,.07);border-radius:var(--radius);padding:24px;overflow:hidden;transition:.22s ease;display:flex;flex-direction:column;min-height:280px}
.issue-card::after{content:"";position:absolute;right:-25px;top:-25px;width:110px;height:110px;border:1px solid rgba(16,39,94,.14);border-radius:50%;box-shadow:0 0 0 16px rgba(16,39,94,.03),0 0 0 32px rgba(16,39,94,.025)}
.issue-card:hover{transform:translateY(-4px);box-shadow:0 18px 45px rgba(24,34,55,.12);border-color:rgba(16,39,94,.42)}
.card-top{display:flex;justify-content:space-between;gap:16px;align-items:start}.index{font-family:'SFMono-Regular',Consolas,monospace;font-size:11px;color:var(--navy)}
.section-tag{font-family:'SFMono-Regular',Consolas,monospace;font-size:11px;color:var(--navy);border-bottom:2px solid var(--accent,var(--blue));padding-bottom:4px}
.card-title{font-size:28px;line-height:1.2;margin:22px 0 10px;color:var(--navy)}
.card-en{font-family:Georgia,'Times New Roman',serif;font-size:15px;line-height:1.55;color:#525e71;margin:0 0 16px}
.card-foot{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:auto;padding-top:16px;border-top:1px solid rgba(16,39,94,.13)}
.card-label{font-family:'SFMono-Regular',Consolas,monospace;font-size:11px;color:#697386}.card-arrow{font-size:18px;color:var(--navy)}
.issue-footer{padding:12px 0 42px;border-top:1px solid rgba(16,39,94,.18);display:flex;justify-content:space-between;gap:16px;color:#667183;font-size:12px}

/* Article */
.article-shell{max-width:1260px;margin:0 auto;padding:0 26px 60px;display:grid;grid-template-columns:minmax(0,var(--reading)) 250px;gap:38px}
.article-main{min-width:0;background:rgba(255,251,237,.78);border:1px solid rgba(16,39,94,.15);box-shadow:var(--shadow);border-radius:16px;overflow:hidden}
.article-head{padding:30px 34px 26px;border-bottom:1px solid rgba(16,39,94,.22)}
.back{display:inline-flex;gap:8px;text-decoration:none;font-family:'SFMono-Regular',Consolas,monospace;font-size:11px;color:#5c6678;margin-bottom:20px}
.article-kicker{display:flex;align-items:center;gap:14px;flex-wrap:wrap;color:var(--navy);font-family:'SFMono-Regular',Consolas,monospace;font-size:11px;text-transform:uppercase;letter-spacing:.08em}
.article-kicker .mini-rule{width:70px;height:1px;background:var(--navy)}
.article-title-zh{font-size:36px;line-height:1.16;color:var(--navy);margin:12px 0 6px}
.article-meta{font-size:13px;color:#667183;line-height:1.7}
.article-english{font-size:25px;line-height:1.22;color:var(--navy);margin:22px 0 10px;max-width:780px}
.dek{font-size:15px;line-height:1.7;color:#596477;margin:0 0 18px;max-width:700px}
.stats-row{display:flex;gap:8px;flex-wrap:wrap}.stat{padding:6px 9px;border-top:2px solid var(--accent,var(--blue));font-size:11px;background:rgba(255,255,255,.45);font-family:'SFMono-Regular',Consolas,monospace;color:#4a5568}
.level-bar{position:sticky;top:0;z-index:10;background:rgba(250,247,235,.95);backdrop-filter:blur(8px);border-bottom:1px solid rgba(16,39,94,.18);padding:12px 34px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.level-nav{display:flex;gap:6px;flex-wrap:wrap}.level-btn{font:700 11px/1 'SFMono-Regular',Consolas,monospace;border:1px solid rgba(16,39,94,.22);background:rgba(255,255,255,.65);border-radius:999px;padding:9px 11px;color:#4c5870;cursor:pointer}.level-btn.active{background:var(--navy);color:#fff;border-color:var(--navy)}.level-desc{font-size:12px;color:#6d7685;text-align:right}
.article-body{padding:28px 34px 44px}.story{padding-bottom:26px}
.story p{font-size:18px;line-height:1.9;margin:0 0 20px;letter-spacing:.005em}.story p:last-child{margin-bottom:0}
.term{position:relative;border-radius:5px;padding:0 2px;cursor:help;transition:.16s}.term:hover{filter:brightness(.97)}
.term-core{background:rgba(93,146,223,.22)}.term-mid{background:rgba(243,179,92,.28)}.term-adv{background:rgba(131,200,121,.28)}.term-topic{background:rgba(239,162,183,.28)}
.term small{display:inline-block;transform:translateY(-.15em);margin-left:3px;font-size:.56em;line-height:1;color:#6b5f56;font-family:'Noto Serif SC','Songti SC',serif;font-weight:700}
.section-block{margin-top:28px;padding-top:24px;border-top:1px dashed rgba(16,39,94,.28)}
.section-block h2{font-size:20px;color:var(--navy);margin:0 0 15px}.section-block h3{font-size:15px;color:var(--navy);margin:20px 0 6px}.section-block p{font-size:14px;line-height:1.85;color:#4f5a6c;margin:0 0 12px}
.think{margin:28px 0;padding:18px 20px;border-left:4px solid var(--orange);background:rgba(243,179,92,.10)}.think .label{font-family:'SFMono-Regular',Consolas,monospace;font-size:10px;color:#8b6b38;text-transform:uppercase;letter-spacing:.08em}.think p{font-family:Georgia,'Times New Roman',serif;font-size:17px;line-height:1.6;margin:7px 0 0;color:#4b5666}
.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.feature-card{padding:14px 15px;border:1px solid rgba(16,39,94,.14);background:rgba(255,255,255,.45);border-radius:12px}.feature-card .num{font-family:'SFMono-Regular',Consolas,monospace;font-size:10px;color:#758096}.feature-card h3{margin:6px 0;color:#2a477c;font-size:14px}.feature-card .eg{font-style:italic;color:#49556c;font-size:13px;line-height:1.5}.feature-card p{font-size:13px;line-height:1.7}
.sentence{padding:16px 0;border-top:1px solid rgba(16,39,94,.12)}.sentence:first-child{border-top:0}.sentence .en{font-size:16px;line-height:1.75;color:#28364f;margin-bottom:7px}.sentence .zh{font-size:14px;line-height:1.75;color:#626d7e;margin-bottom:8px}.parse{margin:0;padding-left:20px;color:#697383;font-size:13px;line-height:1.75}
.usage{display:grid;grid-template-columns:1fr 1fr;gap:12px}.usage-card{border:1px solid rgba(16,39,94,.13);border-radius:12px;padding:15px;background:rgba(255,255,255,.48)}.usage-card h3{margin:0 0 7px;font-size:14px}.usage-card p{margin:0 0 8px}.usage-card .ex{font-size:13px;color:#35435c}
.bg-card{padding:17px 18px;border-left:3px solid var(--blue);background:rgba(93,146,223,.07);margin-bottom:12px}.bg-card h3{margin:0 0 8px}.bg-card p{margin:0 0 7px}.source-list{display:grid;gap:8px}.source-list a{display:flex;gap:10px;align-items:baseline;text-decoration:none;font-family:'SFMono-Regular',Consolas,monospace;font-size:12px;color:#31507f;overflow-wrap:anywhere}.source-list a:hover{text-decoration:underline}
.vocab-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.vocab{padding:10px 12px;border-radius:10px;min-height:82px;border:1px solid rgba(16,39,94,.10)}.vocab-core{background:rgba(93,146,223,.13)}.vocab-mid{background:rgba(243,179,92,.15)}.vocab-adv{background:rgba(131,200,121,.16)}.vocab-topic{background:rgba(239,162,183,.14)}.vocab .w{font-weight:700;color:var(--navy);font-size:14px}.vocab .pron{font-family:'SFMono-Regular',Consolas,monospace;font-size:10px;color:#727c8d;margin-left:6px}.vocab .gl{font-size:12px;color:#4e5a6b;margin-top:4px}.vocab .en{font-size:11px;line-height:1.5;color:#5b6576;margin-top:4px}
.article-tail{padding:22px 34px;border-top:1px solid rgba(16,39,94,.18);display:flex;justify-content:space-between;gap:14px;background:rgba(255,255,255,.32)}.nav-link{text-decoration:none;font-family:'SFMono-Regular',Consolas,monospace;font-size:11px;color:#34496f}.nav-link:hover{text-decoration:underline}
.side{position:sticky;top:20px;height:max-content}.side-card{border-left:1px dashed var(--navy);padding-left:18px}.side h3{margin:0 0 10px;color:var(--navy);font-size:14px}.side-list{display:grid;gap:4px}.side-list a{text-decoration:none;font-size:12px;line-height:1.5;color:#687284;padding:6px 0}.side-list a:hover{color:var(--navy)}
.site-note{padding:22px 0 44px;color:#697384;font-size:11px;line-height:1.6}.site-note strong{color:#475570}
@media (max-width:980px){.home-hero{grid-template-columns:1fr}.hero-note{justify-self:start;max-width:680px;border-left:0;border-top:1px dashed var(--navy);padding:16px 0 0}.issue-grid{grid-template-columns:1fr}.article-shell{grid-template-columns:1fr;max-width:900px}.side{display:none}.article-title-zh{font-size:31px}.article-english{font-size:23px}.level-bar{align-items:flex-start;flex-direction:column}.level-desc{text-align:left}}
@media (max-width:640px){.container{padding:0 16px}.site-header{padding-top:18px}.brand-row{align-items:flex-start;flex-direction:column;gap:7px}.home-hero{padding:30px 0 22px}.hero-title{font-size:43px}.hero-sub{font-size:16px}.issue-card{min-height:0}.article-shell{padding:0 8px 35px}.article-head,.article-body{padding-left:20px;padding-right:20px}.level-bar{padding:10px 20px}.story p{font-size:17px;line-height:1.85}.feature-grid,.usage,.vocab-grid{grid-template-columns:1fr}.article-tail{padding-left:20px;padding-right:20px}.stats-row{gap:6px}}