:root{--bg:#07080b;--fg:#f4f4f4;--muted:rgba(244,244,244,.74);--soft:rgba(244,244,244,.55);--accent:#ffe600;--accent2:#cfd2d7;--red:#8e211f;--panel:rgba(9,10,14,.88);--line:rgba(255,230,0,.24);--line2:rgba(255,255,255,.11);--maxw:1180px;--reading:900px;--radius:18px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--fg);font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:#07080b;line-height:1.68;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:inherit}img{max-width:100%}::selection{background:var(--accent);color:#080808}
.lab-shell{min-height:100vh;background:linear-gradient(90deg,rgba(4,5,8,.985),rgba(4,5,8,.84) 54%,rgba(4,5,8,.92)),url('../pic/hangzas-bg.webp') center top/cover fixed no-repeat;position:relative}.lab-shell:before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.18;background-image:linear-gradient(rgba(255,230,0,.10) 1px,transparent 1px),linear-gradient(90deg,rgba(255,230,0,.10) 1px,transparent 1px);background-size:36px 36px;mask-image:linear-gradient(90deg,transparent,black 22%,black 82%,transparent)}.lab-shell:after{content:"";position:fixed;right:-10vw;top:12vh;width:58vw;height:58vw;border:1px solid rgba(255,230,0,.09);border-radius:50%;box-shadow:0 0 0 44px rgba(255,230,0,.018),0 0 0 88px rgba(255,230,0,.013),0 0 0 132px rgba(255,230,0,.009);pointer-events:none}
.lab-top{position:sticky;top:0;z-index:30;background:rgba(4,5,8,.88);backdrop-filter:blur(15px);border-bottom:1px solid rgba(255,255,255,.08)}.lab-top-inner{max-width:var(--maxw);margin:auto;padding:11px 18px;display:flex;align-items:center;justify-content:space-between;gap:18px}.lab-logo{width:148px;display:block}.lab-nav{display:flex;gap:7px;align-items:center;flex-wrap:wrap;justify-content:flex-end}.lab-nav a{font-size:.75rem;font-weight:850;letter-spacing:.08em;text-transform:uppercase;text-decoration:none;padding:8px 10px;border-radius:10px;color:rgba(255,255,255,.72)}.lab-nav a:hover,.lab-nav a[aria-current="page"]{color:var(--accent);background:rgba(255,230,0,.065)}
.container{position:relative;z-index:2;max-width:var(--maxw);margin:auto;padding:68px 18px 82px}.eyebrow{color:var(--accent);text-transform:uppercase;letter-spacing:.19em;font-weight:900;font-size:.74rem}.hero{max-width:980px}.hero h1{margin:10px 0 5px;font-size:clamp(3rem,8vw,7rem);line-height:.9;letter-spacing:-.05em}.hero h1 span{color:var(--accent)}.hero .lead{max-width:850px;font-size:clamp(1rem,2vw,1.23rem);color:var(--muted)}.hero .tagline{font-size:1.02rem;color:var(--accent);font-weight:900;letter-spacing:.15em;text-transform:uppercase}.hero-rule{height:1px;background:linear-gradient(90deg,var(--accent),rgba(255,230,0,.06),transparent);margin:34px 0}
.categories{display:flex;flex-wrap:wrap;gap:9px;margin:28px 0 18px}.chip{border:1px solid var(--line);background:rgba(255,230,0,.045);border-radius:999px;padding:7px 12px;color:rgba(255,255,255,.78);font-size:.74rem;font-weight:850;letter-spacing:.055em;text-transform:uppercase}
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.panel{margin-top:42px;padding:28px;border:1px solid rgba(255,230,0,.19);border-radius:var(--radius);background:rgba(6,7,10,.80);box-shadow:0 24px 70px rgba(0,0,0,.30)}.panel h2{margin-top:0}.disclaimer{font-size:.91rem;color:rgba(244,244,244,.72)}.disclaimer p{margin:.78em 0}.disclaimer strong{color:#fff}.compact-disclaimer{margin-top:54px}
.article{max-width:var(--reading);padding-top:55px}.article-header{padding:0 0 28px;border-bottom:1px solid rgba(255,255,255,.10);margin-bottom:28px}.article-header h1{font-size:clamp(2.45rem,6vw,5.1rem);line-height:1.00;letter-spacing:-.045em;margin:12px 0 13px}.article-subtitle{font-size:clamp(1.05rem,2.2vw,1.34rem);color:rgba(255,255,255,.72);max-width:820px}.article-meta{display:flex;gap:12px;flex-wrap:wrap;margin-top:16px;font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;font-weight:800;color:rgba(255,255,255,.48)}.article-meta span{border:1px solid rgba(255,255,255,.10);padding:6px 9px;border-radius:999px}.article p,.article li{color:rgba(244,244,244,.82)}.article .intro{font-size:1.16rem;line-height:1.72;color:rgba(255,255,255,.90)}.article h2{scroll-margin-top:84px;margin:2.35em 0 .62em;font-size:clamp(1.48rem,3vw,2.15rem);line-height:1.18;letter-spacing:-.02em}.article h2:before{content:"// ";color:var(--accent);font-weight:900}.article h3{scroll-margin-top:84px;margin:1.7em 0 .48em;color:#fff;font-size:1.16rem}.article ul,.article ol{padding-left:1.3rem}.article li{margin:.34em 0}.article table{width:100%;border-collapse:collapse;margin:18px 0;font-size:.9rem}.article th,.article td{border-bottom:1px solid rgba(255,255,255,.11);padding:10px 9px;text-align:left;vertical-align:top}.article th{color:var(--accent);font-size:.72rem;text-transform:uppercase;letter-spacing:.06em}.article strong{color:#fff}.article em{color:rgba(255,255,255,.92)}
.toc{margin:28px 0 38px;padding:20px 22px;border:1px solid rgba(255,255,255,.11);border-left:3px solid var(--accent);border-radius:0 16px 16px 0;background:rgba(0,0,0,.30)}.toc strong{display:block;color:var(--accent);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:9px}.toc ol{margin:0;columns:2;column-gap:34px;padding-left:1.2rem}.toc li{break-inside:avoid;font-size:.82rem}.toc a{text-decoration:none;color:rgba(255,255,255,.70)}.toc a:hover{color:var(--accent)}
.formula{margin:20px 0;padding:18px 20px;border-left:3px solid var(--accent);background:linear-gradient(90deg,rgba(255,230,0,.075),rgba(255,230,0,.015));border-radius:0 14px 14px 0;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:1.02rem;overflow:auto;color:#fff}.calc{margin:26px 0;padding:22px;border:1px solid rgba(255,230,0,.34);border-radius:16px;background:linear-gradient(135deg,rgba(255,230,0,.085),rgba(255,255,255,.02))}.calc .label,.callout-label{display:block;color:var(--accent);font-weight:950;letter-spacing:.12em;text-transform:uppercase;font-size:.72rem;margin-bottom:7px}.callout{margin:26px 0;padding:20px 21px;border:1px solid rgba(255,255,255,.12);border-radius:14px;background:rgba(255,255,255,.035)}.callout.engineer{border-color:rgba(255,230,0,.25);background:rgba(255,230,0,.035)}.callout.myth{border-color:rgba(255,255,255,.15)}.callout.safety{border-color:rgba(185,52,45,.55);background:rgba(110,20,18,.16)}.callout.safety .callout-label{color:#ff8d84}.callout p:last-child,.calc p:last-child{margin-bottom:0}.references{font-size:.88rem}.references a{color:var(--accent)}
.article-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:34px}.next-link,.prev-link{display:flex;flex-direction:column;gap:4px;border:1px solid var(--line);border-radius:14px;padding:14px 16px;text-decoration:none;font-weight:800;background:rgba(255,230,0,.025)}.next-link{text-align:right;align-items:flex-end}.prev-link:hover,.next-link:hover{border-color:var(--accent);color:var(--accent)}.article-nav small{font-size:.67rem;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.46)}
.footer{position:relative;z-index:2;border-top:1px solid rgba(255,255,255,.09);background:rgba(3,4,6,.92)}.footer-inner{max-width:var(--maxw);margin:auto;padding:26px 18px;color:rgba(255,255,255,.53);font-size:.76rem;display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}.footer a{color:var(--accent)}
.notice{position:fixed;inset:0;z-index:1000;display:grid;place-items:center;padding:18px;background:rgba(0,0,0,.90);backdrop-filter:blur(15px)}.notice[hidden]{display:none}.notice-card{width:min(780px,100%);border:1px solid rgba(255,230,0,.44);border-radius:20px;background:linear-gradient(160deg,#111318,#07080b);box-shadow:0 35px 100px rgba(0,0,0,.68),inset 0 1px rgba(255,255,255,.04);padding:30px}.notice-kicker{color:var(--accent);font-size:.74rem;font-weight:950;letter-spacing:.14em;text-transform:uppercase}.notice-card h2{margin:8px 0 12px}.notice-card p{color:rgba(255,255,255,.73)}.notice-actions{display:grid;grid-template-columns:1fr;gap:10px;margin-top:20px}.btn{display:inline-flex;justify-content:center;align-items:center;padding:12px 16px;border-radius:12px;border:1px solid rgba(255,230,0,.45);text-decoration:none;font-weight:900;cursor:pointer}.btn.primary{background:var(--accent);color:#070707;border-color:var(--accent)}.btn.secondary{background:transparent;color:#fff}.notice-full{display:inline-block;margin-top:14px;color:var(--accent);font-size:.82rem}.notice-note{font-size:.73rem;color:rgba(255,255,255,.45)!important}
@media(max-width:780px){.article-grid{grid-template-columns:1fr}.lab-nav{display:none}.container{padding-top:46px}.article-card{grid-template-columns:50px 1fr;padding:18px}.notice-card{padding:23px}.toc ol{columns:1}.article-nav{grid-template-columns:1fr}.next-link{text-align:left;align-items:flex-start}.article table{display:block;overflow-x:auto;white-space:normal}}

.article-author{margin:14px 0 2px;color:rgba(245,241,234,.78);font-size:.9rem;font-weight:650;letter-spacing:.03em}

/* SWORD LAB reviewed 2026-08-27 */
.hero-brand{display:flex;align-items:center;gap:28px;flex-wrap:wrap;margin:14px 0 16px;overflow:visible}
.hero-brand-logo{display:block;width:min(640px,72vw);max-width:100%;height:auto;object-fit:contain;object-position:left center;overflow:visible;filter:drop-shadow(0 10px 22px rgba(0,0,0,.35))}
.hero-brand-lab{font-size:clamp(2.1rem,5vw,4.2rem);font-weight:900;letter-spacing:.14em;color:#d8b174;line-height:1;white-space:nowrap}
.article-tags,.lab-topic-tags{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 4px}
.article-tags span,.lab-topic-tags span{display:inline-flex;align-items:center;border:1px solid rgba(255,230,0,.24);border-radius:999px;padding:6px 10px;background:rgba(255,230,0,.035);color:rgba(255,255,255,.72);font-size:.72rem;font-weight:800;letter-spacing:.035em}
.article-tags span::first-letter,.lab-topic-tags span::first-letter{color:var(--accent)}
.merged-note{margin:18px 0;padding:16px 18px;border-left:3px solid rgba(255,230,0,.58);background:rgba(255,230,0,.026);border-radius:0 12px 12px 0}
.merged-note p{margin:.5em 0}
@media(max-width:780px){.hero-brand{gap:14px}.hero-brand-logo{width:min(520px,80vw)}.hero-brand-lab{font-size:clamp(1.8rem,8vw,2.8rem)}}

/* SWORD LAB notice UX fix */
.notice{overflow:auto;overscroll-behavior:contain}
.notice-card{max-height:min(92svh,920px);overflow-y:auto;scrollbar-gutter:stable}
.notice-full[aria-expanded="true"]{color:#fff}
.notice-details{margin-top:18px;padding-top:18px;border-top:1px solid rgba(255,230,0,.22);color:rgba(255,255,255,.72);font-size:.88rem;line-height:1.68}
.notice-details[hidden]{display:none}
.notice-details h3{margin:0 0 12px;color:#fff;font-size:1.06rem}
.notice-details p{margin:.78em 0}
.notice-details strong{color:#fff}