/* ================= GSTMap — shared design system ================= */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  --ink:#14202E; --ink-soft:#28394C; --paper:#EBEFF3; --surface:#FFFFFF;
  --line:#D2DBE3; --line-soft:#E3EAF0; --muted:#5B6B7B; --muted-2:#7E8D9B;
  --brand:#0F766E; --brand-deep:#0B5952;
  --cgst:#0F766E; --igst:#3A57A6; --rules:#A9761A;
  --ok:#1E7D4F; --warn:#B0472F; --amber:#A9761A; --grey:#64748B;
  --shadow:0 1px 2px rgba(20,32,46,.06), 0 8px 24px -12px rgba(20,32,46,.22);
  --shadow-lift:0 2px 4px rgba(20,32,46,.08), 0 18px 40px -16px rgba(20,32,46,.34);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:"IBM Plex Sans",system-ui,sans-serif;color:var(--ink);background:var(--paper);
  background-image:radial-gradient(circle at 1px 1px, rgba(20,32,46,.045) 1px, transparent 0);
  background-size:26px 26px;-webkit-font-smoothing:antialiased;line-height:1.55}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 22px}
.mono{font-family:"IBM Plex Mono",monospace}

/* header */
header.mast{border-bottom:1px solid var(--line);background:rgba(235,239,243,.9);backdrop-filter:blur(6px);position:sticky;top:0;z-index:40}
.mast-in{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:13px 0}
.brand{display:flex;align-items:center;gap:11px}
.glyph{width:32px;height:32px;flex:none}
.brand-name{font-family:"Fraunces",serif;font-weight:600;font-size:21px;letter-spacing:-.01em;color:var(--ink)}
.brand-name b{color:var(--brand)}
nav.top{display:flex;gap:22px}
nav.top a{color:var(--ink-soft);font-size:14px;font-weight:500}
nav.top a:hover{color:var(--brand);text-decoration:none}
@media(max-width:680px){nav.top{gap:14px;font-size:13px}.brand-name{font-size:19px}}

/* hero */
.hero{padding:38px 0 20px}
.kicker{font-family:"IBM Plex Mono",monospace;font-size:11.5px;letter-spacing:.15em;text-transform:uppercase;color:var(--brand);margin:0 0 12px}
.hero h1{font-family:"Fraunces",serif;font-weight:500;font-size:clamp(28px,4.4vw,44px);line-height:1.08;letter-spacing:-.015em;margin:0 0 14px;max-width:20ch}
.hero p.lede{font-size:16px;color:var(--ink-soft);max-width:60ch;margin:0 0 24px}

/* search */
.search-shell{position:relative;max-width:640px}
.search-box{display:flex;align-items:center;gap:12px;background:var(--surface);border:1.5px solid var(--line);border-radius:14px;padding:14px 16px;box-shadow:var(--shadow);transition:.15s}
.search-box:focus-within{border-color:var(--brand);box-shadow:0 0 0 4px rgba(15,118,110,.12),var(--shadow)}
.search-box svg{flex:none;color:var(--muted)}
.search-box input{border:0;outline:0;font-family:inherit;font-size:16.5px;color:var(--ink);width:100%;background:transparent}
.search-box input::placeholder{color:var(--muted-2)}
.sresults{position:absolute;left:0;right:0;top:calc(100% + 8px);background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-lift);overflow:hidden;z-index:30;display:none;max-height:420px;overflow-y:auto}
.sresults.open{display:block}
.sr-item{display:block;padding:11px 16px;border-bottom:1px solid var(--line-soft);cursor:pointer}
.sr-item:last-child{border-bottom:0}
.sr-item:hover{background:#F1F5F7;text-decoration:none}
.sr-cite{font-family:"IBM Plex Mono",monospace;font-size:12px;font-weight:600;color:var(--brand);margin-right:8px}
.sr-title{font-size:14px;color:var(--ink)}
.sr-src{font-family:"IBM Plex Mono",monospace;font-size:10.5px;color:var(--muted-2);text-transform:uppercase;letter-spacing:.05em;display:block;margin-top:2px}
.sr-empty{padding:16px;color:var(--muted);font-size:14px}

/* tiles */
.tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:30px 0 8px}
@media(max-width:760px){.tiles{grid-template-columns:repeat(2,1fr)}}
.tile{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px 16px;box-shadow:var(--shadow);transition:.16s;display:block}
.tile:hover{transform:translateY(-2px);box-shadow:var(--shadow-lift);text-decoration:none;border-color:var(--brand)}
.tile .t-ic{font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--brand);letter-spacing:.08em;text-transform:uppercase}
.tile .t-name{font-family:"Fraunces",serif;font-size:19px;font-weight:600;color:var(--ink);margin:8px 0 4px}
.tile .t-desc{font-size:12.5px;color:var(--muted)}

/* section heading */
.sec-head{display:flex;align-items:baseline;justify-content:space-between;margin:40px 0 16px}
.sec-head h2{font-family:"Fraunces",serif;font-weight:600;font-size:22px;letter-spacing:-.01em;margin:0}
.sec-head a{font-size:13px;font-weight:500}

/* doc list / cards */
.doc-list{display:flex;flex-direction:column;gap:10px}
.doc-card{display:block;background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--sc,var(--brand));border-radius:11px;padding:14px 16px;box-shadow:var(--shadow);transition:.14s}
.doc-card:hover{transform:translateY(-1px);box-shadow:var(--shadow-lift);text-decoration:none}
.dc-top{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:5px}
.dc-cite{font-family:"IBM Plex Mono",monospace;font-size:13px;font-weight:600;color:var(--sc,var(--brand))}
.dc-type{font-family:"IBM Plex Mono",monospace;font-size:10px;text-transform:uppercase;letter-spacing:.07em;color:#fff;background:var(--sc,var(--brand));border-radius:5px;padding:3px 7px}
.dc-date{font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--muted-2);margin-left:auto}
.dc-subject{font-size:14.5px;color:var(--ink);font-weight:500;line-height:1.4}
.badge{font-family:"IBM Plex Mono",monospace;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;border-radius:5px;padding:3px 8px;display:inline-block}
.b-inforce{background:rgba(30,125,79,.12);color:var(--ok)}
.b-superseded{background:rgba(176,71,47,.12);color:var(--warn)}
.b-amended{background:rgba(169,118,26,.14);color:var(--amber)}
.b-omitted{background:rgba(100,116,139,.14);color:var(--grey)}

/* filters */
.filters{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}
.filters select,.filters input{font-family:inherit;font-size:13.5px;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:9px;padding:9px 12px;outline:none}
.filters select:focus,.filters input:focus{border-color:var(--brand)}
.fcount{font-size:13px;color:var(--muted);margin-left:auto;align-self:center}

/* content pages */
.page{background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:34px 38px;margin:26px 0}
@media(max-width:600px){.page{padding:24px 20px}}
.page h1{font-family:"Fraunces",serif;font-weight:600;font-size:30px;letter-spacing:-.015em;margin:0 0 6px}
.page h2{font-family:"Fraunces",serif;font-weight:600;font-size:20px;margin:26px 0 10px}
.page p,.page li{font-size:15px;color:var(--ink-soft);line-height:1.7}
.page .lead{font-size:16.5px;color:var(--ink)}
.eyebrow{font-family:"IBM Plex Mono",monospace;font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--brand);margin-bottom:14px}

/* document detail */
.doc-head{background:var(--ink);color:#fff;border-radius:16px;padding:28px 32px;margin:26px 0 0}
.doc-head .dh-badges{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:14px}
.doc-head .dh-type{font-family:"IBM Plex Mono",monospace;font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;background:rgba(127,216,203,.2);color:#7FD8CB;border-radius:5px;padding:4px 9px}
.doc-head .dh-cite{font-family:"IBM Plex Mono",monospace;font-size:15px;color:#7FD8CB;font-weight:600;margin-bottom:6px}
.doc-head h1{font-family:"Fraunces",serif;font-weight:500;font-size:26px;line-height:1.2;margin:0}
.doc-meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1px;background:var(--line-soft);border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:18px 0}
.dm{background:var(--surface);padding:13px 16px}
.dm .k{font-family:"IBM Plex Mono",monospace;font-size:10.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted-2);margin-bottom:3px}
.dm .v{font-size:14px;color:var(--ink);font-weight:500}
.doc-body{background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:28px 32px;margin-bottom:26px}
.doc-body h3{font-family:"Fraunces",serif;font-size:17px;margin:0 0 10px}
.chiplinks{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.chiplink{font-family:"IBM Plex Mono",monospace;font-size:12px;background:var(--paper);border:1px solid var(--line);border-radius:999px;padding:5px 12px;color:var(--ink-soft)}

/* footer */
footer.site{border-top:1px solid var(--line);margin-top:36px;padding:26px 0 40px}
footer.site .f-in{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between}
footer.site .fdis{font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--muted-2);line-height:1.7;max-width:60ch}
footer.site .fdis b{color:var(--muted)}
footer.site nav{display:flex;gap:16px;flex-wrap:wrap}
footer.site nav a{font-size:12.5px;color:var(--muted)}

.note{background:rgba(169,118,26,.09);border:1px solid rgba(169,118,26,.25);border-radius:10px;padding:11px 14px;font-size:12.5px;color:var(--amber);margin:16px 0}