/* Greybox Industries — Ink Indigo + Copper on Paper
   Static theme CSS. HSL tokens mirror the React design system. */

:root {
  --background: 38 30% 96%;
  --foreground: 230 35% 12%;
  --paper: 36 38% 97%;
  --paper-deep: 34 24% 92%;
  --primary: 230 38% 16%;
  --primary-foreground: 38 30% 96%;
  --muted: 34 18% 88%;
  --muted-foreground: 230 10% 38%;
  --accent: 24 62% 48%;
  --accent-foreground: 38 30% 96%;
  --accent-soft: 24 55% 92%;
  --border: 34 18% 84%;
  --destructive: 358 65% 42%;

  --font-display: "Instrument Serif", ui-serif, Georgia, serif;
  --font-sans: "Plus Jakarta Sans", ui-sans-serif, system-ui, sans-serif;

  --shadow-paper: 0 1px 2px hsl(230 35% 12% / .04), 0 8px 32px -12px hsl(230 35% 12% / .10);
  --shadow-card: 0 1px 0 hsl(230 35% 12% / .04), 0 1px 3px hsl(230 35% 12% / .06);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background: hsl(var(--background));
  color: hsl(var(--foreground));
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
h1, h2, h3, .display { font-family: var(--font-display); letter-spacing: -.01em; margin: 0; font-weight: 400; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
@media (max-width: 767px){ .container { padding: 0 16px; } }
@media (min-width: 768px){ .container { padding: 0 32px; } }

/* Header */
.site-header {
  border-bottom: 1px solid hsl(var(--border) / .7);
  background: hsl(var(--background) / .8);
  backdrop-filter: blur(8px);
}
.site-header .row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 0;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 36px; height: 36px; display: inline-flex; align-items: center; justify-content: center;
  background: hsl(var(--primary)); color: hsl(var(--primary-foreground));
  transition: transform .25s ease;
}
.brand:hover .brand-mark { transform: rotate(12deg); }
.brand-name { font-family: var(--font-display); font-size: 26px; color: hsl(var(--primary)); line-height: 1; }
.brand-sub { font-size: 10px; letter-spacing: .28em; text-transform: uppercase; color: hsl(var(--muted-foreground)); margin-top: 2px; }
.nav { display: none; align-items: center; gap: 32px; font-size: 14px; color: hsl(var(--foreground) / .7); }
.nav a:hover { color: hsl(var(--accent)); }
.nav .cta {
  border: 1px solid hsl(var(--primary) / .8); padding: 8px 16px;
  font-size: 12px; font-weight: 600; letter-spacing: .18em; text-transform: uppercase;
  color: hsl(var(--primary)); transition: all .2s;
}
.nav .cta:hover { background: hsl(var(--primary)); color: hsl(var(--primary-foreground)); }
@media (min-width: 768px){ .nav { display: flex; } }

/* Hamburger button — hidden by default, shown only on mobile */
.nav-toggle { display: none; }

@media (max-width: 767px) {
  .nav-toggle {
    display: flex; flex-direction: column; justify-content: space-between;
    width: 28px; height: 20px; padding: 0; background: none; border: none;
    cursor: pointer; z-index: 100; flex-shrink: 0;
  }
  .nav-toggle span {
    display: block; height: 2px; background: hsl(var(--primary));
    border-radius: 2px; transition: transform .25s ease, opacity .2s ease;
    transform-origin: center;
  }
  .nav-toggle--open span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
  .nav-toggle--open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
  .nav-toggle--open span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

  .site-header { position: relative; }
  .site-header .row { flex-wrap: wrap; padding: 16px 0; }
  .nav {
    display: none; flex-direction: column; align-items: flex-start; gap: 0;
    width: 100%; padding: 12px 0 20px; border-top: 1px solid hsl(var(--border) / .7);
  }
  .nav.nav-open { display: flex; }
  .nav .nav-link {
    width: 100%; padding: 12px 0; font-size: 15px;
    border-bottom: 1px solid hsl(var(--border) / .5);
    color: hsl(var(--foreground) / .8);
  }
  .nav .cta { margin-top: 16px; align-self: flex-start; }
}

/* Hero */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid hsl(var(--border) / .6); }
.hero-bg {
  position: absolute; inset: 0; opacity: .6; pointer-events: none;
  background-image:
    radial-gradient(60% 60% at 80% 0%, hsl(var(--accent) / .10), transparent 60%),
    radial-gradient(50% 50% at 0% 100%, hsl(var(--primary) / .08), transparent 60%);
}
.hero-inner { position: relative; padding: 80px 0; }
@media (min-width: 768px){ .hero-inner { padding: 112px 0; } }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 11px; font-weight: 600; letter-spacing: .32em; text-transform: uppercase;
  color: hsl(var(--accent)); margin: 0 0 24px;
}
.eyebrow .rule { display: inline-block; width: 32px; height: 1px; background: hsl(var(--accent)); }
.hero h1 {
  font-size: clamp(32px, 7vw, 96px); line-height: 1.02; color: hsl(var(--primary));
  max-width: 960px;
}
.hero h1 .it { font-style: italic; color: hsl(var(--accent)); }
.hero p.lead {
  margin-top: 32px; max-width: 640px; font-size: clamp(15px, 4vw, 19px); line-height: 1.6;
  color: hsl(var(--muted-foreground));
}
.cta-row { margin-top: 40px; display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; font-size: 13px; font-weight: 600;
  letter-spacing: .16em; text-transform: uppercase; cursor: pointer; border: 0;
  transition: all .2s;
}
.btn-primary { background: hsl(var(--primary)); color: hsl(var(--primary-foreground)); }
.btn-primary:hover { background: hsl(var(--accent)); }
.btn-link { color: hsl(var(--primary)); padding: 12px 8px; text-underline-offset: 8px; }
.btn-link:hover { text-decoration: underline; }

/* Article shell */
.article-shell { padding-bottom: 80px; }
.article-grid {
  background: hsl(var(--paper)); box-shadow: var(--shadow-paper);
  display: grid; grid-template-columns: 1fr; overflow: hidden;
}
@media (min-width: 768px){ .article-grid { grid-template-columns: 1fr 320px; } }
.article-main { padding: 28px 16px; order: 1; }
@media (min-width: 768px){ .article-main { padding: 56px; order: 1; } }

/* Expandable section (static = always-open) */
.section {
  position: relative; border-top: 1px solid hsl(var(--border));
  padding: 28px 0; margin: 0;
}
@media (min-width: 768px){
  .section { padding: 28px 12px; margin: 0 -12px; }
}
.section:first-child { border-top: 0; }
.section:hover, .section:focus-within { background: hsl(var(--foreground) / .025); }
.section-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.glyph {
  width: 32px; height: 32px; border-radius: 999px;
  background: hsl(var(--primary)); color: hsl(var(--primary-foreground));
  display: inline-flex; align-items: center; justify-content: center; font-size: 13px;
}
.section h2 {
  font-size: 22px; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: hsl(var(--primary));
}
.section .body { display: flex; flex-direction: column; gap: 16px; font-size: 15px; line-height: 1.7; color: hsl(var(--foreground) / .85); }
.section .body a { color: hsl(var(--accent)); text-decoration: underline; text-underline-offset: 4px; }
.section .body a:hover { color: hsl(var(--primary)); }
.section .body strong { color: hsl(var(--primary)); }

/* Aside */
.aside {
  background: hsl(var(--paper-deep)); color: hsl(var(--primary));
  padding: 48px 32px; order: 2;
}
@media (min-width: 768px){ .aside { order: 2; } }
.aside-brand { display: flex; flex-direction: column; align-items: center; text-align: center; }
.aside-mark {
  width: 96px; height: 96px; border-radius: 999px;
  background: linear-gradient(135deg, hsl(var(--primary)), hsl(var(--primary) / .7));
  color: hsl(var(--primary-foreground));
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-card); outline: 8px solid hsl(var(--primary) / .05);
}
.aside h3 { margin-top: 20px; font-size: 30px; line-height: 1.1; color: hsl(var(--primary)); }
.aside .tagline { margin-top: 4px; font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: hsl(var(--primary) / .6); }
.aside-block { margin-top: 40px; padding-top: 24px; border-top: 1px solid hsl(var(--primary) / .15); }
.aside-block h4 {
  font-family: var(--font-display); font-size: 12px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .22em; color: hsl(var(--primary) / .7);
  margin: 0 0 16px;
}
.news-item {
  display: block; border-left: 2px solid hsl(var(--accent));
  padding-left: 16px; font-size: 13px; line-height: 1.6; color: hsl(var(--primary) / .8);
}
.news-item:hover { color: hsl(var(--primary)); }
.news-item .date { display: block; font-size: 10px; font-weight: 600; letter-spacing: .22em; text-transform: uppercase; color: hsl(var(--accent)); }
.news-item .body { display: block; margin-top: 8px; }
.aside ul { list-style: none; margin: 0; padding: 0; font-size: 13px; color: hsl(var(--primary) / .8); }
.aside ul li { margin-bottom: 8px; }
.aside ul a:hover { color: hsl(var(--accent)); }

/* Forms */
.form { display: flex; flex-direction: column; gap: 14px; max-width: 560px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 13px; font-weight: 600; color: hsl(var(--foreground)); }
.field input, .field textarea {
  width: 100%; padding: 10px 12px; font: inherit; font-size: 14px;
  background: hsl(var(--background)); color: hsl(var(--foreground));
  border: 1px solid hsl(var(--border)); border-radius: 2px; outline: 0;
  transition: all .2s;
}
.field textarea { min-height: 120px; resize: vertical; }
.field input:focus, .field textarea:focus {
  border-color: hsl(var(--primary)); box-shadow: 0 0 0 2px hsl(var(--primary) / .15);
}

/* General-content prose extras */
.prose .dropcap::first-letter {
  float: left; margin-right: 8px; font-family: var(--font-display);
  font-size: 64px; line-height: .9; color: hsl(var(--accent));
}
.prose h3 { font-family: var(--font-display); font-size: 26px; color: hsl(var(--primary)); margin-top: 1px; }
.prose ul { padding-left: 20px; }
.prose ul li::marker { color: hsl(var(--accent)); }
.prose blockquote {
  border-left: 2px solid hsl(var(--accent));
  background: hsl(var(--accent-soft) / .4);
  padding: 16px 20px; margin: 8px 0;
  font-family: var(--font-display); font-size: 22px; font-style: italic;
  line-height: 1.5; color: hsl(var(--primary));
}
.divider { border: 0; border-top: 1px solid hsl(var(--border)); margin: 32px 0; }

/* Footer */
.site-footer {
  border-top: 1px solid hsl(var(--border));
  background: hsl(var(--paper-deep));
}
.site-footer .row {
  display: flex; flex-direction: column; gap: 16px;
  padding: 40px 0; font-size: 14px; color: hsl(var(--muted-foreground));
}
@media (min-width: 768px){
  .site-footer .row { flex-direction: row; align-items: center; justify-content: space-between; }
}
.site-footer a { color: hsl(var(--primary)); }
.site-footer a:hover { color: hsl(var(--accent)); }
.foot-nav { display: flex; flex-wrap: wrap; align-items: center; gap: 24px;
  font-size: 11px; letter-spacing: .18em; text-transform: uppercase; }