/* ============================================================
   Hypervisor Design System — tokens + signature components
   ============================================================
   ONE system, TWO surfaces:
     [data-surface="limestone"]  — light reading surface (default)
     [data-surface="slate"]      — dark chrome / cover surface

   Pattern: "Slate frames Limestone."
     Slate masthead bars + Slate footer-shelves bracket Limestone
     reading surfaces.

   Type:    General Sans (display + body + labels). NO mono.
   Accent:  Oxblood (#a93226) — sole accent color. Used sparingly.
   Ink:     Slate (#2a2e33) — body text on Limestone, never pure black.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');
@import url('https://api.fontshare.com/v2/css?f[]=general-sans@400,500,600,700,800&display=swap');

:root {
  --limestone:       #d6d2c4;
  --limestone-rule:  #b9b5a6;
  --limestone-tag:   #c7c2b1;
  --slate:           #2a2e33;
  --slate-fg:        #eceae5;
  --slate-rule:      #3f444a;
  --slate-tag:       rgba(255,255,255,0.10);
  --oxblood:         #a93226;

  --font-display: 'General Sans', 'Inter', -apple-system, sans-serif;
  --font-body:    'General Sans', 'Inter', -apple-system, sans-serif;
  --font-label:   'General Sans', 'Inter', -apple-system, sans-serif;

  --max-width:      1280px;
  --reading-width:  680px;
  --gutter:         56px;

  --r-xs: 2px;
  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 8px;

  --fs-display:  clamp(64px, 7vw, 96px);
  --fs-h1:       clamp(40px, 4vw, 56px);
  --fs-h2:       clamp(28px, 2.6vw, 36px);
  --fs-h3:       20px;
  --fs-body-lg:  18px;
  --fs-body:     16px;
  --fs-body-sm:  14px;
  --fs-label:    11px;

  --bg:     var(--limestone);
  --ink:    var(--slate);
  --rule:   var(--limestone-rule);
  --tag:    var(--limestone-tag);
  --accent: var(--oxblood);
}

[data-surface="limestone"] {
  --bg:     var(--limestone);
  --ink:    var(--slate);
  --rule:   var(--limestone-rule);
  --tag:    var(--limestone-tag);
  --accent: var(--oxblood);
}

[data-surface="slate"] {
  --bg:     var(--slate);
  --ink:    var(--slate-fg);
  --rule:   var(--slate-rule);
  --tag:    var(--slate-tag);
  --accent: var(--oxblood);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
ul, ol { list-style: none; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  font-size: var(--fs-body);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-h1);
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--ink);
}
h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-h2);
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--ink);
}
h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-h3);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--ink);
}
p {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--ink);
}

.em, em.brand, h1 em, h2 em, h3 em {
  color: var(--accent);
  font-style: normal;
}

a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s, color 0.15s;
}
a:hover { color: var(--accent); border-bottom-color: var(--accent); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ============================================================
   CHROME — Slate masthead + Slate shelf footer
   "Slate frames Limestone"
   ============================================================ */
.header {
  background: var(--slate);
  color: var(--slate-fg);
  padding: 14px var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 10;
}
.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.025em;
  color: var(--slate-fg);
  border-bottom: none;
}
.logo:hover { color: var(--slate-fg); border-bottom: none; }
.logo .studio { font-weight: 400; opacity: 0.85; margin-left: 0.18em; letter-spacing: -0.015em; }
.logo .dot { color: var(--oxblood); }

.nav { display: flex; gap: 26px; }
.nav a {
  font-size: 13px;
  font-weight: 500;
  opacity: 0.65;
  color: var(--slate-fg);
  transition: opacity 0.15s, color 0.15s;
  border-bottom: none;
}
.nav a:hover { opacity: 1; color: var(--slate-fg); border-bottom: none; }
.nav a.active { opacity: 1; font-weight: 600; }

main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 48px var(--gutter) 64px;
}

.footer {
  background: var(--slate);
  color: var(--slate-fg);
  padding: 22px var(--gutter);
  border-top: 4px solid var(--oxblood);
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.footer a {
  color: var(--slate-fg);
  border-bottom: none;
  opacity: 0.85;
}
.footer a:hover { color: var(--oxblood); border-bottom: none; opacity: 1; }
.footer-sep { margin: 0 0.6rem; opacity: 0.5; }

/* ============================================================
   HOME — gallery + cards
   ============================================================ */
.gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.card {
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: var(--r-sm);
  overflow: hidden;
  transition: border-color 0.15s;
}
.card:hover { border-color: var(--ink); }
.card a {
  display: block;
  color: inherit;
  border-bottom: none;
}
.card a:hover { border-bottom: none; color: inherit; }
.card-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: contain;
  display: block;
  background: var(--slate);
  padding: 18px;
}
.card-body {
  padding: 18px 20px 22px;
  border-top: 1px solid var(--rule);
}
.card-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 4px;
  transition: color 0.15s;
}
.card:hover .card-title { color: var(--oxblood); }
.card-subtitle {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
  opacity: 0.65;
}

/* ============================================================
   PAGE / ABOUT / POST content
   ============================================================ */
.page-content,
.about-content {
  max-width: var(--reading-width);
  margin: 0 auto;
}
.page-content h1,
.about-content h1 {
  font-size: clamp(40px, 4vw, 56px);
  margin-bottom: 18px;
}
.page-content h2 { margin: 36px 0 12px; }
.page-content h3 { margin: 28px 0 10px; }
.page-content p,
.about-content p { margin-bottom: 18px; }
.page-content ul,
.page-content ol {
  list-style: revert;
  padding-left: 1.5rem;
  margin-bottom: 18px;
}
.page-content li { margin-bottom: 6px; }
.page-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 16px;
  margin: 22px 0;
  font-size: var(--fs-body-lg);
  line-height: 1.5;
  opacity: 0.85;
}
.page-content code {
  background: var(--rule);
  padding: 0.15rem 0.4rem;
  border-radius: var(--r-xs);
  font-size: 0.9em;
  font-family: var(--font-body);
}
.page-content pre {
  background: var(--slate);
  color: var(--slate-fg);
  border-radius: var(--r-sm);
  padding: 16px 18px;
  overflow-x: auto;
  margin-bottom: 18px;
  font-size: 13.5px;
}
.page-content pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  color: inherit;
}
.page-content img {
  max-width: 100%;
  border-radius: var(--r-sm);
  margin-bottom: 18px;
}
.page-content strong { font-weight: 700; }

.post-meta {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.6;
  margin-bottom: 18px;
}

/* Footnote citations — oxblood superscripts */
.page-content sup a {
  font-weight: 700;
  font-size: 11px;
  color: var(--accent);
  text-decoration: none;
  padding: 0 2px;
  border-bottom: none;
}
.page-content sup a:hover { border-bottom: 1px solid var(--accent); }

.references {
  margin-top: 48px;
  padding-top: 18px;
  border-top: 1px solid var(--ink);
  font-size: 13.5px;
}
.references h2 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.6;
  margin-bottom: 8px;
}
.references ol { padding-left: 1.5rem; line-height: 1.6; }
.references li { word-break: break-word; margin-bottom: 4px; }

/* ============================================================
   BLOG INDEX — post list (numbered fields, hairline rules)
   ============================================================ */
.post-list { padding: 0; }
.post-list li {
  border-top: 1px solid var(--rule);
  padding: 18px 0;
}
.post-list li:last-child { border-bottom: 1px solid var(--rule); }
.post-list a {
  display: block;
  color: inherit;
  border-bottom: none;
}
.post-list a:hover { border-bottom: none; }
.post-list a:hover .post-list-title { color: var(--oxblood); }
.post-list-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.015em;
  color: var(--ink);
  transition: color 0.15s;
}
.post-list-date {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-bottom: 4px;
}
.post-list-excerpt {
  font-size: 14px;
  margin-top: 4px;
  opacity: 0.7;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .gallery { grid-template-columns: 1fr; gap: 24px; }
  .header { padding: 12px 24px; }
  main { padding: 32px 24px 48px; }
  .footer { padding: 20px 24px; }
  .nav { gap: 18px; }
}