/* =========================================================================
   SvnBd — landing page
   "Revision ledger" identity, extended: warm paper chrome, a dark well where
   the machine speaks, and monospace as the display face. Brass never decorates
   — it only ever means "live / this is HEAD now".
   ========================================================================= */

@font-face{font-family:'Plex Sans';src:url('/fonts/plex-sans-400.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Plex Sans';src:url('/fonts/plex-sans-500.woff2') format('woff2');font-weight:500;font-display:swap}
@font-face{font-family:'Plex Sans';src:url('/fonts/plex-sans-600.woff2') format('woff2');font-weight:600;font-display:swap}
@font-face{font-family:'Plex Mono';src:url('/fonts/plex-mono-400.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Plex Mono';src:url('/fonts/plex-mono-500.woff2') format('woff2');font-weight:500;font-display:swap}
@font-face{font-family:'Plex Mono';src:url('/fonts/plex-mono-600.woff2') format('woff2');font-weight:600;font-display:swap}

:root{
  --paper:#FBFAF7; --surface:#FFFFFF; --surface-2:#F4F2EB;
  --ink:#17181B; --ink-2:#595E66; --ink-3:#8C9098;
  --rule:#E8E4DA; --rule-2:#DAD5C8;
  --accent:#2540D9; --accent-ink:#1B2EA6; --accent-wash:#ECEEFB;
  --brass:#8A5E10; --brass-lit:#D8A94A; --brass-wash:#F6EDD8; --brass-line:#E4D2A6;
  --well:#15171E; --well-2:#232733; --well-ink:#C9D2DE; --well-dim:#6C7789;
  --font-sans:'Plex Sans',-apple-system,'Segoe UI',Roboto,sans-serif;
  --font-mono:'Plex Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shadow:0 1px 2px rgba(20,18,12,.04),0 22px 48px -30px rgba(20,18,12,.34);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--paper);color:var(--ink);
  font:400 16px/1.6 var(--font-sans);-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}
.mono{font-family:var(--font-mono);font-size:.92em}

.wrap{max-width:1180px;margin-inline:auto;padding:0 32px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:16px;top:12px;z-index:60;background:var(--surface);
  border:1px solid var(--rule-2);border-radius:7px;padding:8px 14px}

/* ---------------- Top bar ---------------- */
.top{position:sticky;top:0;z-index:30;background:rgba(251,250,247,.88);
  backdrop-filter:saturate(140%) blur(10px);border-bottom:1px solid var(--rule)}
.top-in{display:flex;align-items:center;gap:30px;height:64px}
.brand{display:flex;align-items:center;gap:8px;color:var(--ink);font-weight:600;font-size:15.5px}
.brand b{color:var(--accent);font-weight:600}
.top-nav{display:flex;gap:24px;margin-left:8px}
.top-nav a{color:var(--ink-2);font-size:14px}
.top-nav a:hover{color:var(--ink)}
.top .btn{margin-left:auto}

/* ---------------- Buttons ---------------- */
.btn{display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 19px;
  border:1px solid transparent;border-radius:8px;font:500 14px/1 var(--font-sans);
  white-space:nowrap;transition:background .16s ease,border-color .16s ease,color .16s ease}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-ink);color:#fff}
.btn-ghost{background:var(--surface);border-color:var(--rule-2);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink-3);color:var(--ink)}

/* ---------------- Hero ---------------- */
.hero{padding:76px 0 84px}
.eyebrow{margin:0 0 22px;font:500 11px/1 var(--font-mono);letter-spacing:.19em;
  text-transform:uppercase;color:var(--ink-3)}
.display{margin:0;font-family:var(--font-mono);font-weight:600;
  font-size:clamp(29px,4.7vw,55px);line-height:1.1;letter-spacing:-.04em}
.display .dim-line{color:var(--accent)}
.lede{margin:26px 0 0;max-width:60ch;font-size:17.5px;line-height:1.6;color:var(--ink-2)}
.actions{display:flex;flex-wrap:wrap;gap:11px;margin-top:30px}
.actions-end{margin-top:32px}

/* ---------------- Signature: one rule, both worlds ---------------- */
.recon{margin-top:58px;display:grid;grid-template-columns:1fr 74px 1fr;
  background:var(--well);border-radius:14px;box-shadow:var(--shadow);overflow:hidden}
.recon-pane{display:flex;flex-direction:column;min-width:0}
.pane-head{display:flex;align-items:baseline;gap:9px;padding:13px 20px;
  border-bottom:1px solid var(--well-2)}
.pane-tag{font:600 11px/1 var(--font-mono);letter-spacing:.13em;text-transform:uppercase;
  color:var(--well-ink)}
.pane-sub{font:400 11px/1 var(--font-mono);color:var(--well-dim)}
.pane-body{padding:22px 20px 24px;flex:1}

.rule-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font:400 13px/1 var(--font-sans);color:var(--well-dim)}
.pill-user,.pill-lvl,.pill-path{border-radius:6px;padding:5px 9px;
  font:500 12.5px/1 var(--font-mono)}
.pill-user{background:rgba(37,64,217,.22);color:#A9B8FF}
.pill-lvl{background:rgba(95,208,138,.14);color:#7FD3A0}
.pill-path{background:rgba(255,255,255,.06);color:var(--well-ink)}
.writes{margin:20px 0 9px;font:400 11.5px/1 var(--font-mono);letter-spacing:.05em;
  color:var(--well-dim)}
.writes .mono{font-size:1em;color:#9AA6B8}
.authz{margin:0;padding:13px 15px;border-radius:8px;background:rgba(255,255,255,.045);
  border:1px solid var(--well-2);font:400 12.5px/1.7 var(--font-mono);color:var(--well-ink);
  overflow-x:auto}
.authz .c{color:var(--brass-lit)}

.recon-link{position:relative;display:flex;align-items:center;justify-content:center}
.conn{display:block;width:100%;height:1px;
  background:repeating-linear-gradient(to right,rgba(201,210,222,.28) 0 4px,transparent 4px 9px)}
.conn-label{position:absolute;width:0;height:0;overflow:hidden}

.recon-term{border-left:1px solid var(--well-2)}
.term{margin:0;font:400 12.8px/1.85 var(--font-mono);color:var(--well-ink);overflow-x:auto}
.term .o{color:var(--well-dim)}
.term .ok{color:var(--brass-lit)}
.head-pill{display:inline-flex;align-items:center;gap:7px;margin-top:18px;padding:5px 11px;
  border-radius:999px;background:rgba(216,169,74,.12);border:1px solid rgba(216,169,74,.32);
  font:500 11.5px/1 var(--font-mono);letter-spacing:.06em;color:var(--brass-lit)}
.head-pill .node{width:7px;height:7px;border-radius:50%;background:var(--brass-lit)}
.recon-note{margin:18px 0 0;max-width:56ch;font-size:14px;color:var(--ink-3)}

/* one orchestrated reveal, played once on load */
.recon .step{opacity:0}
.recon.go .step{animation:rise .5s cubic-bezier(.2,.7,.3,1) forwards}
.recon.go [data-step="1"]{animation-delay:.15s}
.recon.go [data-step="2"]{animation-delay:.55s}
.recon.go [data-step="3"]{animation-delay:.75s}
.recon.go [data-step="4"]{animation-delay:1.05s}
.recon.go [data-step="5"]{animation-delay:1.3s}
.recon.go [data-step="6"]{animation-delay:1.55s}
.recon.go [data-step="7"]{animation-delay:1.72s}
.recon.go [data-step="8"]{animation-delay:1.95s}
.recon.go [data-step="9"]{animation-delay:2.2s}
@keyframes rise{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:none}}

/* ---------------- Bands ---------------- */
.band{border-top:1px solid var(--rule)}
.band-in{display:grid;grid-template-columns:186px 1fr;gap:56px;padding:78px 0}
.rail .layer{position:sticky;top:96px;display:block;font:500 11px/1.5 var(--font-mono);
  letter-spacing:.17em;text-transform:uppercase;color:var(--ink-3)}
.band-body h2{margin:0 0 15px;font:600 clamp(23px,2.5vw,30px)/1.22 var(--font-sans);
  letter-spacing:-.018em;max-width:27ch}
.para{margin:0 0 4px;max-width:64ch;font-size:16.5px;line-height:1.62;color:var(--ink-2)}
.para em{font-style:italic;color:var(--ink)}
.para-tight{margin-top:26px}

/* ---------------- Architecture diagram ---------------- */
.diagram{margin:36px 0 6px;padding:30px 26px;background:var(--surface);
  border:1px solid var(--rule-2);border-radius:12px}
.dg-row{display:flex;align-items:stretch}
.dg-center{justify-content:center}
.node-box{flex:1 1 0;min-width:0;display:flex;flex-direction:column;gap:3px;
  padding:13px 15px;background:var(--paper);border:1px solid var(--rule-2);border-radius:9px}
.node-role{font:500 9.5px/1 var(--font-mono);letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3)}
.node-name{font:600 14.5px/1.3 var(--font-sans);color:var(--ink)}
.node-name.mono{font-family:var(--font-mono);font-size:13.5px;font-weight:500}
.node-meta{font-size:12px;line-height:1.45;color:var(--ink-2)}
.node-accent{background:var(--accent-wash);border-color:#C3CBF4}
.node-file{flex:0 1 350px;background:var(--brass-wash);border-color:var(--brass-line)}
.node-file .node-role{color:var(--brass)}

.wire{position:relative;flex:0 0 62px;align-self:center;height:1px;background:var(--rule-2)}
.wire::after{content:'';position:absolute;right:0;top:-3.5px;
  border-left:6px solid var(--rule-2);border-top:4px solid transparent;border-bottom:4px solid transparent}
.wire::before{content:attr(data-label);position:absolute;left:50%;top:-16px;transform:translateX(-50%);
  font:500 9px/1 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3)}
.dg-drop{position:relative;height:52px;display:flex;align-items:center;justify-content:center}
.drop-line{position:absolute;top:0;bottom:0;left:50%;width:1px;background:var(--rule-2)}
.drop-label{position:relative;background:var(--surface);padding:0 11px;
  font:500 9.5px/1 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3)}

/* ---------------- Ledger table ---------------- */
.ledger{width:100%;margin-top:30px;border-collapse:collapse;
  border:1px solid var(--rule);border-radius:10px;overflow:hidden}
.ledger th{background:var(--surface-2);text-align:left;padding:10px 16px;
  font:500 10px/1 var(--font-mono);letter-spacing:.15em;text-transform:uppercase;color:var(--ink-3);
  border-bottom:1px solid var(--rule)}
.ledger td{padding:14px 16px;border-bottom:1px solid var(--rule);vertical-align:top;
  background:var(--surface)}
.ledger tr:last-child td{border-bottom:0}
.ledger td b{display:block;font-weight:600;font-size:15px;color:var(--ink)}
.ledger td .sub{display:block;margin-top:3px;font-size:13.5px;line-height:1.5;color:var(--ink-2)}
.ledger th:last-child,.ledger td:last-child{width:36%;border-left:1px solid var(--rule)}
.ledger td.mono{font:400 13px/1.5 var(--font-mono);color:var(--ink-2);white-space:nowrap}

/* ---------------- Facts ---------------- */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:30px 46px;margin-top:32px}
.fact{padding-top:15px;border-top:1px solid var(--rule-2)}
.fact-k{display:block;margin-bottom:7px;font:600 13px/1.4 var(--font-mono);
  letter-spacing:-.005em;color:var(--ink)}
.fact p{margin:0;font-size:14.5px;line-height:1.6;color:var(--ink-2)}

/* ---------------- Wells ---------------- */
.well{margin:30px 0 0;padding:22px 24px;background:var(--well);color:var(--well-ink);
  border-radius:12px;font:400 13.4px/1.85 var(--font-mono);overflow-x:auto}
.well .cm{color:var(--well-dim)}
.well-tight{margin-top:14px;padding:16px 24px}
.band-last{padding-bottom:8px}

/* ---------------- Footer ---------------- */
.foot{border-top:1px solid var(--rule);background:var(--surface-2)}
.foot-in{display:flex;align-items:center;gap:18px;flex-wrap:wrap;padding:24px 0;font-size:13.5px}
.foot-brand{font-weight:600;color:var(--ink)}
.foot-brand b{color:var(--accent);font-weight:600}
.foot-meta{color:var(--ink-3);font-size:12px}
.foot .spacer{flex:1}
.foot a{color:var(--ink-2)}
.foot a:hover{color:var(--accent)}

/* ---------------- Responsive ---------------- */
@media (max-width:900px){
  .wrap{padding:0 20px}
  .top-nav{display:none}
  .hero{padding:60px 0 62px}
  .recon{grid-template-columns:1fr}
  .recon-link{height:44px}
  .conn{width:1px;height:100%;
    background:repeating-linear-gradient(to bottom,rgba(201,210,222,.28) 0 4px,transparent 4px 9px)}
  .recon-term{border-left:0;border-top:1px solid var(--well-2)}
  .band-in{grid-template-columns:1fr;gap:22px;padding:54px 0}
  .rail .layer{position:static}
  .grid-2{grid-template-columns:1fr;gap:24px}
  .dg-row{flex-direction:column}
  .wire{flex:0 0 34px;width:1px;height:34px;margin:0 auto;background:var(--rule-2)}
  .wire::after{right:auto;left:-3.5px;top:auto;bottom:0;
    border-left:4px solid transparent;border-right:4px solid transparent;
    border-top:6px solid var(--rule-2);border-bottom:0}
  .wire::before{left:calc(50% + 10px);top:50%;transform:translateY(-50%)}
  .node-file{flex:1 1 auto}
  .ledger td.mono{white-space:normal}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .recon .step{opacity:1!important;animation:none!important;transform:none!important}
  *{transition:none!important}
}