/* ============================================================
   deepakbuild — letters shell · Terminal Ledger tokens + chrome
   Shared by the letter pages in /blog. Page-specific component
   styles live in each page; this file owns tokens, nav, crumb,
   progress bar, theme button, and colophon — copied from site.css
   so the letter pages render identically to the rest of the site
   without importing its full class surface.
   ============================================================ */

:root{
  --bg:#0A0B0E;
  --bg2:#12141A;
  --ink:#F2F3F5;
  --ink-soft:#C3C8D0;
  --muted:#878E9A;
  --blue:#2E4BFF;
  --blue-hot:#4F66FF;
  --blue-deep:#1F36C7;
  --lime:#C9F16A;
  --lime-hot:#C9F16A;
  --band:#EDEFF2;
  --band-ink:#0A0B0E;
  --band-rule:rgba(10,11,14,.18);
  --rule:rgba(242,243,245,.16);
  --rule-soft:rgba(242,243,245,.08);
  --rule-strong:rgba(242,243,245,.38);
  --on-blue:#FFFFFF;
  --dot:rgba(46,75,255,.4);
  color-scheme:dark;
}
:root[data-theme="light"]{
  --bg:#FAFAFA;
  --bg2:#EFEFEF;
  --ink:#0A0B0E;
  --ink-soft:#343A44;
  --muted:#6A7280;
  --blue:#2036E8;
  --blue-hot:#1F36C7;
  --blue-deep:#16249A;
  --lime:#3F5700;
  --band:#0A0B0E;
  --band-ink:#F2F3F5;
  --band-rule:rgba(242,243,245,.22);
  --rule:rgba(10,11,14,.18);
  --rule-soft:rgba(10,11,14,.09);
  --rule-strong:rgba(10,11,14,.42);
  --on-blue:#FFFFFF;
  --dot:rgba(32,54,232,.28);
  color-scheme:light;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg)}
body{
  font-family:"Archivo",-apple-system,"Helvetica Neue",Arial,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.5;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background .25s ease,color .25s ease;
}
::selection{background:var(--blue);color:var(--on-blue)}
a{color:inherit;text-decoration:none}
img{max-width:100%}

h1,h2,h3,.grotesk{font-family:"Archivo",sans-serif;font-stretch:114%}
.mono{font-family:"IBM Plex Mono",monospace}
.num{font-variant-numeric:tabular-nums lining-nums;font-feature-settings:"tnum","lnum"}

.prog{position:fixed;top:0;left:0;height:3px;width:0;z-index:100;background:var(--blue)}
.wrap{max-width:none;margin:0 auto;padding:0 clamp(20px,3vw,52px)}
section[id]{scroll-margin-top:70px}

/* ---------- nav ---------- */
nav{position:sticky;top:0;z-index:80;background:var(--bg);border-bottom:1px solid var(--rule)}
.nav-in{max-width:none;margin:0 auto;padding:0 clamp(20px,3vw,52px);display:flex;align-items:center;justify-content:space-between;height:58px}
.mark{font-family:"Archivo",sans-serif;font-stretch:114%;font-size:18px;font-weight:700;letter-spacing:-.01em;
  padding:7px 11px;transition:background .45s cubic-bezier(.2,.7,.2,1),color .45s cubic-bezier(.2,.7,.2,1)}
.mark b{color:var(--blue-hot);transition:color .45s cubic-bezier(.2,.7,.2,1)}
nav.scrolled .mark{background:var(--blue);color:var(--on-blue)}
nav.scrolled .mark b{color:var(--lime-hot)}
a.mark{cursor:pointer}
.nav-links{display:flex;gap:4px;align-items:center;height:100%}
.nav-links a{font-family:"IBM Plex Mono",monospace;font-size:11px;font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);
  padding:8px 12px;transition:.18s}
.nav-links a:hover,.nav-links a.act{color:var(--ink);background:var(--bg2)}
.nav-links a.nav-cta{background:var(--blue);color:var(--on-blue);margin-left:10px;padding:10px 16px}
.nav-links a.nav-cta:hover{background:var(--blue-hot);color:var(--on-blue)}
@media(max-width:820px){.nav-links a:not(.nav-cta):not(:last-child){display:none}}

.theme-btn{font-family:"IBM Plex Mono",monospace;font-size:10px;letter-spacing:.1em;text-transform:uppercase;
  border:1px solid var(--rule-strong);background:transparent;color:var(--ink-soft);
  padding:8px 11px;margin-left:12px;cursor:pointer;transition:.18s;line-height:1}
.theme-btn:hover{border-color:var(--blue);color:var(--blue-hot)}
.theme-btn:focus-visible{outline:2px solid var(--blue);outline-offset:2px}

/* ---------- crumb masthead ---------- */
.cmast{padding:24px 0 10px}
.cmast .back{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft)}
.cmast .back:hover{color:var(--blue-hot)}
.cmast .crumb{display:flex;justify-content:space-between;align-items:baseline;flex-wrap:wrap;gap:10px}
.cmast .crumb .tag{font-family:"IBM Plex Mono",monospace;font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--lime)}
.drule{border-top:1px solid var(--rule);height:0}

/* ---------- colophon ---------- */
.colophon{padding:34px 0 60px}
.col-in{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:18px;
  font-family:"IBM Plex Mono",monospace;font-size:10.5px;letter-spacing:.04em;color:var(--muted);line-height:1.9}
.col-in b{color:var(--ink);font-weight:500}
.elink{font-family:"IBM Plex Mono",monospace;font-size:12px;letter-spacing:.04em;color:var(--ink);
  border-bottom:1px solid var(--rule-strong);padding-bottom:2px;transition:.18s}
.elink:hover{color:var(--blue-hot);border-color:var(--blue-hot)}

/* mono size lift, matching site.css +25% pass (unconditional there too) */
.nav-links a{font-size:13.5px}
.theme-btn{font-size:12.5px}
.elink{font-size:14.5px}
.col-in{font-size:13px}
.cmast .back{font-size:14px}
.cmast .crumb .tag{font-size:13px}