:root{--bg:#FAF7F4;--card:#fff;--text:#171A1F;--muted:#667085;--accent:#176E5F;--accent-soft:#EAF4F1;--line:#E8E4DF;--shadow:0 18px 50px rgba(23,26,31,.10)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.65}a{color:var(--accent)}
.wrap{max-width:920px;margin:0 auto;padding:20px 20px 80px}.hero{background:linear-gradient(145deg,#fff 0%,#f4fbf8 100%);border:1px solid var(--line);border-radius:32px;padding:48px;box-shadow:var(--shadow);margin:18px 0 28px}
.eyebrow{display:inline-flex;padding:7px 12px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-weight:700;font-size:14px;margin-bottom:18px}
h1{font-size:clamp(34px,6vw,58px);line-height:1.05;letter-spacing:-.035em;margin:0 0 18px}h2{font-size:clamp(25px,4vw,36px);line-height:1.15;letter-spacing:-.02em;margin:0 0 12px}h3{font-size:21px;margin:0 0 8px}p{margin:0 0 16px}.lead{font-size:20px;max-width:760px;color:#3d454f}.meta{margin-top:22px;color:var(--muted);font-size:14px}
.toc,.card{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:28px;margin:22px 0}.toc li{margin:7px 0}.step{background:var(--card);border:1px solid var(--line);border-radius:24px;margin:24px 0;overflow:hidden;box-shadow:0 8px 25px rgba(23,26,31,.045)}.step-body{padding:30px}.step-num{width:40px;height:40px;border-radius:50%;background:var(--accent);color:white;display:inline-grid;place-items:center;font-weight:800;margin-bottom:16px}
figure{margin:0;border-top:1px solid var(--line);background:#f7f8fa;padding:22px 18px 0}figure img{display:block;width:min(100%,560px);height:auto;max-height:980px;object-fit:contain;background:#fff;margin:0 auto;border-radius:14px;box-shadow:0 8px 24px rgba(23,26,31,.08)}figcaption{padding:12px 0 16px;color:var(--muted);font-size:13px;max-width:560px;margin:0 auto}.note{border-radius:18px;padding:18px 20px;margin:18px 0;background:var(--accent-soft);border:1px solid #cfe5df}
.faq details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px 18px;margin:10px 0}.faq summary{font-weight:750;cursor:pointer}.faq details p{margin-top:10px}.sources{font-size:14px;color:var(--muted);border-top:1px solid var(--line);margin-top:34px;padding-top:24px}
.spec-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:18px}.spec-card{border:1px solid var(--line);border-radius:18px;padding:18px;background:#FBFCFC}.spec-label{font-size:13px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.04em}.spec-value{font-size:25px;font-weight:800;letter-spacing:-.02em;color:var(--accent);margin:3px 0 8px}.spec-card p{margin:0;font-size:14px;color:#49515b}
.article-nav{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center;margin:4px 0 16px}.nav-btn,.nav-home{display:flex;align-items:center;min-height:46px;border:1px solid var(--line);background:#fff;border-radius:14px;padding:10px 14px;text-decoration:none;font-size:13px;font-weight:700}.nav-prev{justify-self:start}.nav-next{justify-self:end;text-align:right}.nav-home{justify-self:center;background:var(--accent);color:#fff;border-color:var(--accent)}
.editorbar{position:sticky;top:0;z-index:50;display:flex;gap:14px;align-items:center;flex-wrap:wrap;padding:10px 18px;background:#171A1F;color:#fff}.editorbar button{border:0;border-radius:10px;padding:9px 16px;font-weight:700;background:#fff;color:#171A1F;cursor:pointer}.editorbar a,.editorbar #status{color:#b9e6dc}.editorbar+main [contenteditable=true]{outline:1px dashed transparent;border-radius:6px}.editorbar+main [contenteditable=true]:hover,.editorbar+main [contenteditable=true]:focus{outline-color:#176E5F;background:#f6fffc}

/* Knowledge base home */
.kb-home{min-height:100vh;background:linear-gradient(180deg,#FAF7F4 0%,#F5F7F6 100%)}.kb-shell{max-width:1120px;margin:0 auto;padding:42px 22px 80px}.kb-header{display:flex;justify-content:space-between;gap:30px;align-items:flex-end;padding:24px 0 34px}.kb-header h1{margin-bottom:12px}.kb-count{flex:0 0 auto;padding:10px 14px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--muted);font-size:14px;font-weight:700}.kb-section{margin-top:12px}.kb-section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:16px}.kb-section-head h2{font-size:28px;margin:0}.kb-section-head p{margin:0;color:var(--muted)}.kb-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.kb-tile{appearance:none;text-align:left;border:1px solid var(--line);background:#fff;border-radius:22px;padding:22px;cursor:pointer;min-height:190px;display:grid;grid-template-rows:auto auto 1fr auto;gap:10px;color:var(--text);box-shadow:0 8px 24px rgba(23,26,31,.045);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}.kb-tile:hover{transform:translateY(-2px);box-shadow:0 18px 42px rgba(23,26,31,.08);border-color:#cddbd7}.kb-index{font-size:13px;color:var(--accent);font-weight:800}.kb-tag{font-size:12px;color:var(--muted)}.kb-tile strong{font-size:22px;line-height:1.18;letter-spacing:-.02em}.kb-open{font-size:13px;color:var(--accent);font-weight:800}

/* Modal article reader */
body.kb-lock{overflow:hidden}.kb-modal{position:fixed;inset:0;z-index:1000;display:none}.kb-modal.is-open{display:block}.kb-backdrop{position:absolute;inset:0;background:rgba(23,26,31,.34);backdrop-filter:blur(6px)}.kb-dialog{position:absolute;inset:3vh 4vw;background:var(--bg);border-radius:24px;overflow:hidden;box-shadow:0 30px 90px rgba(23,26,31,.28);border:1px solid rgba(255,255,255,.55)}.kb-modalbar{height:58px;background:#fff;border-bottom:1px solid var(--line);display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;padding:0 16px;font-size:13px;font-weight:700}.kb-close{width:36px;height:36px;border:0;border-radius:50%;background:#F2F4F3;font-size:25px;line-height:1;cursor:pointer;color:var(--text)}.kb-direct{text-decoration:none}.kb-dialog iframe{width:100%;height:calc(100% - 58px);border:0;background:var(--bg)}
@media(max-width:760px){.wrap{padding:12px 12px 56px}.hero{padding:30px 22px;border-radius:24px}.step-body,.card,.toc{padding:22px}figure{padding:14px 10px 0}figure img{width:100%;border-radius:12px}.lead{font-size:18px}.spec-grid{grid-template-columns:1fr}.article-nav{grid-template-columns:1fr auto 1fr;gap:6px}.nav-btn{font-size:0;width:44px;height:44px;padding:0;justify-content:center}.nav-prev::before{content:"←";font-size:20px}.nav-next::after{content:"→";font-size:20px}.nav-home{font-size:13px}.kb-shell{padding:20px 12px 50px}.kb-header{display:block;padding:14px 4px 24px}.kb-count{display:inline-flex;margin-top:10px}.kb-section-head{display:block;padding:0 4px}.kb-section-head p{margin-top:4px}.kb-grid{grid-template-columns:1fr}.kb-tile{min-height:160px;padding:19px}.kb-dialog{inset:0;border-radius:0}.kb-modalbar{height:54px}.kb-dialog iframe{height:calc(100% - 54px)}.kb-direct{font-size:0}.kb-direct::after{content:"↗";font-size:19px}}