/* guide-article.css — unified 讲堂 article template. Restyles 3 legacy wrappers. */
:root{--cu:#C2762E;--cu-d:#8B5A1B;--ch:#1C1C1E;--w50:#FAF8F5;--w100:#F2EDE6;--w200:#E7DFD4;
  --w300:#D6C9B8;--w400:#A89B89;--w500:#6E6356;--w600:#4A4339;--art-w:760px;--mx:1180px}
*{box-sizing:border-box}
body{margin:0;font-family:'Plus Jakarta Sans',system-ui,-apple-system,'Microsoft YaHei',sans-serif;
  color:var(--ch);background:var(--w50);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--cu);text-decoration:none}a:hover{color:var(--cu-d)}
/* reading progress bar (injected) */
.read-progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--cu),var(--cu-d));z-index:9999;transition:width .1s}
/* topbar (keep existing markup, restyle) */
.topbar{position:sticky;top:0;z-index:50;background:rgba(250,248,245,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--w200)}
.topbar-inner{max-width:var(--mx);margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:3.75rem;padding:0 2rem}
.nav-right{display:flex;align-items:center;gap:1rem}
.nav-link{font-size:.8125rem;font-weight:600;color:var(--w500)}.nav-link:hover,.nav-link--active{color:var(--cu)}
.nav-sep{width:1px;height:1rem;background:var(--w200)}
.nav-live-dot{display:inline-block;width:.4rem;height:.4rem;border-radius:50%;background:#3DA06A;margin-right:.3rem}
.hamburger{display:none;background:none;border:0;font-size:1.25rem;cursor:pointer;color:var(--ch)}
.mobile-nav-drawer,.mobile-nav-backdrop{display:none}
.lang-wrap{position:relative}
.lang-btn{display:inline-flex;align-items:center;gap:.3rem;background:none;border:1px solid var(--w200);border-radius:99px;padding:.25rem .6rem;font-size:.75rem;font-weight:600;color:var(--w600);cursor:pointer}
.lang-menu{position:absolute;right:0;top:120%;background:#fff;border:1px solid var(--w200);border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.08);padding:.25rem;display:none;z-index:60}
.lang-menu.show{display:block}
.lang-item{display:flex;align-items:center;gap:.4rem;padding:.35rem .6rem;font-size:.8125rem;border-radius:6px;cursor:pointer;white-space:nowrap}
.lang-item:hover,.lang-item.active{background:var(--w100)}
/* breadcrumb (replaces back-link) */
.crumb{max-width:var(--art-w);margin:1.5rem auto .5rem;padding:0 2rem;font-size:.75rem;color:var(--w400)}
.crumb a{color:var(--w500)}.crumb a:hover{color:var(--cu)}.crumb b{color:var(--ch)}
.back-link{display:none}
/* article header */
.article-header,.article-hero-inner{max-width:var(--art-w);margin:0 auto 1.5rem;padding:0 2rem}
.article-cat{display:inline-block;font-size:.6875rem;font-weight:800;letter-spacing:.5px;text-transform:uppercase;
  color:var(--cu);background:rgba(194,118,46,.08);border:1px solid rgba(194,118,46,.2);padding:.2rem .6rem;border-radius:99px;margin-bottom:1rem}
.article-title{font-size:clamp(1.6rem,3.4vw,2.4rem);font-weight:850;line-height:1.25;margin:.25rem 0 1rem}
.article-meta-bar{display:flex;align-items:center;gap:.6rem;font-size:.8125rem;color:var(--w400);flex-wrap:wrap}
.meta-dot{width:3px;height:3px;border-radius:50%;background:var(--w300)}
.article-tools-bar{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:1rem}
.tool-badge{font-size:.6875rem;font-weight:700;color:var(--cu);border:1.5px solid var(--cu);border-radius:99px;padding:.25rem .7rem}
.tool-badge:hover{background:var(--cu);color:#fff}
/* disclaimer */
.disclaimer{max-width:var(--art-w);margin:0 auto 1.5rem;padding:0 2rem}
.disclaimer-box{display:flex;gap:.6rem;background:rgba(194,118,46,.05);border:1px solid rgba(194,118,46,.15);border-radius:8px;padding:.75rem 1rem;font-size:.75rem;color:var(--w600);line-height:1.6}
/* body — covers all 3 legacy wrappers */
.article-body,.article-wrapper{max-width:var(--art-w);margin:0 auto;padding:0 2rem 3rem;font-size:1.0625rem}
.article-body h2,.article-wrapper h2{font-size:1.375rem;font-weight:800;margin:2.2rem 0 .8rem;padding-left:.7rem;border-left:4px solid var(--cu);scroll-margin-top:5rem}
.article-body h3,.article-wrapper h3{font-size:1.125rem;font-weight:800;margin:1.6rem 0 .6rem;scroll-margin-top:5rem}
.article-body p,.article-wrapper p{margin:0 0 1.1rem}
.article-body ul,.article-body ol,.article-wrapper ul,.article-wrapper ol{margin:0 0 1.1rem;padding-left:1.4rem}
.article-body li,.article-wrapper li{margin:.35rem 0}
.article-body blockquote,.article-wrapper blockquote{margin:1.4rem 0;padding:.8rem 1.1rem;background:var(--w100);border-left:4px solid var(--cu);border-radius:0 8px 8px 0;color:var(--w600)}
.article-body strong,.article-wrapper strong{color:var(--ch)}
.table-wrap{overflow-x:auto;margin:1.4rem 0;border:1px solid var(--w200);border-radius:10px}
.table-wrap table{width:100%;border-collapse:collapse;font-size:.875rem}
.table-wrap th{background:var(--w100);text-align:left;font-weight:800;padding:.6rem .8rem;border-bottom:2px solid var(--w200)}
.table-wrap td{padding:.6rem .8rem;border-bottom:1px solid var(--w200);vertical-align:top}
.table-wrap tr:last-child td{border-bottom:0}
/* multilingual variant: <article class="article-content"> nested inside .article-wrapper */
.article-cat-tag{display:inline-block;font-size:.6875rem;font-weight:800;letter-spacing:.5px;text-transform:uppercase;color:var(--cu);background:rgba(194,118,46,.08);border:1px solid rgba(194,118,46,.2);padding:.2rem .6rem;border-radius:99px;margin-bottom:1rem}
.article-content{font-size:1.0625rem}
.article-content h2{font-size:1.375rem;font-weight:800;margin:2.2rem 0 .8rem;padding-left:.7rem;border-left:4px solid var(--cu);border-top:0;scroll-margin-top:5rem}
.article-content h3{font-size:1.125rem;font-weight:800;margin:1.6rem 0 .6rem;scroll-margin-top:5rem}
.article-content p{margin:0 0 1.1rem;color:var(--w600);line-height:1.8}
.article-content ul,.article-content ol{margin:0 0 1.1rem;padding-left:1.4rem;color:var(--w600)}
.article-content li{margin:.35rem 0;line-height:1.8}
.article-content blockquote{margin:1.4rem 0;padding:.8rem 1.1rem;background:var(--w100);border-left:4px solid var(--cu);border-radius:0 8px 8px 0;color:var(--w600)}
.article-content strong{color:var(--ch)}
.article-content table{width:100%;border-collapse:collapse;font-size:.875rem;margin:1.4rem 0}
.article-content thead{background:var(--w100)}
.article-content th{text-align:left;font-weight:800;padding:.6rem .8rem;border:1px solid var(--w200);font-size:.8125rem}
.article-content td{padding:.6rem .8rem;border:1px solid var(--w200);vertical-align:top}
/* related tools */
.related-tools{max-width:var(--art-w);margin:0 auto 3rem;padding:0 2rem}
.related-tools-title{font-size:.875rem;font-weight:800;margin-bottom:1rem}
.related-tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:.75rem}
.related-tool-card{background:#fff;border:1px solid var(--w200);border-radius:10px;padding:1rem;transition:all .2s}
.related-tool-card:hover{border-color:var(--cu);box-shadow:0 4px 16px rgba(194,118,46,.12)}
.rt-name{font-size:.875rem;font-weight:800;margin-bottom:.25rem}.rt-desc{font-size:.75rem;color:var(--w500);line-height:1.5}
/* floating TOC (injected, desktop only) */
.guide-toc{position:fixed;top:6rem;right:max(1.5rem,calc((100vw - var(--mx))/2 - 12.5rem));width:13rem;max-height:70vh;overflow:auto;
  font-size:.8125rem;border-left:2px solid var(--w200);padding-left:.9rem;z-index:30}
.guide-toc-h{font-size:.6875rem;font-weight:800;letter-spacing:.5px;text-transform:uppercase;color:var(--w400);margin-bottom:.5rem}
.guide-toc a{display:block;padding:.25rem 0;color:var(--w500);line-height:1.4;border-left:2px solid transparent;margin-left:-.9rem;padding-left:.9rem}
.guide-toc a:hover{color:var(--cu)}
.guide-toc a.active{color:var(--cu);font-weight:700;border-left-color:var(--cu)}
@media(max-width:1180px){.guide-toc{display:none}}
/* footer */
.footer{background:var(--ch);color:var(--w300);padding:2rem;margin-top:2rem}
.footer-inner{max-width:var(--mx);margin:0 auto}
.footer-top{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-bottom:1rem}
.footer-brand{font-weight:850;color:#fff}.footer-links{display:flex;gap:1rem;flex-wrap:wrap}
.footer-links a{color:var(--w400);font-size:.75rem}.footer-bottom{font-size:.75rem;color:var(--w500);border-top:1px solid rgba(255,255,255,.08);padding-top:1rem}
@media(max-width:760px){.topbar-inner{padding:0 1rem}.nav-right .nav-link:not(.lang-wrap):not(.nav-link--live){display:none}
  .article-header,.article-hero-inner,.article-body,.article-wrapper,.crumb,.disclaimer,.related-tools{padding-left:1rem;padding-right:1rem}}