/* =========================================================================
   Gatehill — editorial "ink on paper" design system
   Hand-authored, dependency-free. No gradients, no frameworks.
   ========================================================================= */

/* ---- Design tokens ---- */
:root {
  --paper:      #f6f2e9;   /* warm off-white background          */
  --paper-2:    #efe9dc;   /* slightly deeper panel               */
  --card:       #fbf8f1;   /* raised card surface                 */
  --ink:        #1b1a17;   /* near-black warm text                */
  --ink-soft:   #57534a;   /* secondary text                      */
  --ink-faint:  #8a8578;   /* tertiary / meta                     */
  --rule:       rgba(27, 26, 23, 0.14);   /* hairlines            */
  --rule-soft:  rgba(27, 26, 23, 0.08);
  --accent:     #cf4324;   /* vermilion — the one bold colour     */
  --accent-ink: #a8360f;   /* accent for text on paper (contrast) */
  --accent-2:   #1f6f6b;   /* deep teal — sparing secondary       */

  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Mono", Menlo, Consolas, monospace;

  --wrap: 1120px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 14px;
  --radius-sm: 9px;

  --shadow: 0 1px 2px rgba(27, 26, 23, 0.05), 0 12px 30px -18px rgba(27, 26, 23, 0.35);
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #16150f;
    --paper-2:    #1d1c15;
    --card:       #201e17;
    --ink:        #f2ede0;
    --ink-soft:   #b8b1a1;
    --ink-faint:  #857f70;
    --rule:       rgba(242, 237, 224, 0.16);
    --rule-soft:  rgba(242, 237, 224, 0.09);
    --accent:     #ff6a45;
    --accent-ink: #ff8663;
    --accent-2:   #4ec4bd;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 16px 40px -20px rgba(0, 0, 0, 0.8);
  }
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* faint paper grain — subtle, no gradient */
  background-image: radial-gradient(var(--rule-soft) 0.5px, transparent 0.5px);
  background-size: 22px 22px;
}

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 500; line-height: 1.08; letter-spacing: -0.01em; margin: 0; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
em { font-style: italic; }

/* ---- Layout helpers ---- */
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }

/* ---- Focus / accessibility ---- */
:focus-visible { outline: 2.5px solid var(--accent); outline-offset: 3px; border-radius: 3px; }
.skip-link {
  position: absolute; left: 1rem; top: -3rem; z-index: 100;
  background: var(--ink); color: var(--paper);
  padding: 0.6rem 1rem; border-radius: 8px; font-weight: 600;
  transition: top 0.18s var(--ease);
}
.skip-link:focus { top: 1rem; }

/* =========================================================================
   Route visibility — only the active view is shown
   ========================================================================= */
.view { display: none; }
/* The matching [data-view] for the active html[data-route] is revealed by CSS
   generated from routes.js at build time (see scripts/build.mjs). */

/* =========================================================================
   Header / nav
   ========================================================================= */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; gap: 1rem; }

.wordmark { display: inline-flex; align-items: center; gap: 0.5rem; font-family: var(--font-display); font-weight: 600; font-size: 1.2rem; letter-spacing: -0.02em; color: var(--ink); }
.wordmark .mark { width: 26px; height: 26px; fill: none; stroke: var(--accent); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; overflow: visible; }
.wordmark span { transform: translateY(1px); }

.primary-nav { display: flex; align-items: center; gap: clamp(1rem, 3vw, 2rem); }
.primary-nav > a { font-size: 0.98rem; font-weight: 500; color: var(--ink-soft); position: relative; padding: 0.25rem 0; transition: color 0.15s var(--ease); }
.primary-nav > a:hover { color: var(--ink); }
.primary-nav > a:not(.nav-gh)::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 2px;
  background: var(--accent); transition: right 0.22s var(--ease);
}
.primary-nav > a:not(.nav-gh):hover::after { right: 0; }
.nav-gh { color: var(--ink-soft); display: inline-flex; }
.nav-gh:hover { color: var(--ink); }

.nav-toggle { display: none; }

/* =========================================================================
   Hero
   ========================================================================= */
.hero { padding-top: clamp(3.5rem, 9vw, 7rem); padding-bottom: clamp(2.5rem, 6vw, 4.5rem); }
.eyebrow {
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.02em;
  text-transform: uppercase; color: var(--accent-ink); margin-bottom: 1.5rem;
}
.hero-title {
  font-size: clamp(3rem, 11vw, 7.5rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 0.95;
  max-width: 14ch;
}
.hero-lead {
  margin-top: 1.8rem; max-width: 46ch;
  font-size: clamp(1.1rem, 2.2vw, 1.4rem); line-height: 1.5; color: var(--ink-soft);
}
.hero-lead em { color: var(--ink); font-style: italic; }
.hero-actions { margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: 0.9rem; }

.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.72rem 1.35rem; border-radius: 999px;
  font-weight: 600; font-size: 0.98rem; cursor: pointer;
  border: 1px solid transparent; transition: transform 0.15s var(--ease), background 0.15s var(--ease), border-color 0.15s var(--ease);
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); background: var(--accent-ink); }
.btn-ghost { border-color: var(--rule); color: var(--ink); }
.btn-ghost:hover { transform: translateY(-2px); border-color: var(--ink); }

/* =========================================================================
   Sections
   ========================================================================= */
.section { padding-block: clamp(3rem, 7vw, 5.5rem); border-top: 1px solid var(--rule); scroll-margin-top: 74px; }
.section-head { display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap; margin-bottom: 2.5rem; }
.section-index { font-family: var(--font-mono); font-size: 0.85rem; color: var(--accent-ink); font-weight: 500; }
.section-title { font-size: clamp(1.8rem, 4vw, 2.7rem); }
.section-note { color: var(--ink-faint); font-size: 0.98rem; margin-left: auto; max-width: 32ch; }

/* ---- Featured spotlight ---- */
.spotlight { display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(1.25rem, 3vw, 2rem); }
.spot-card {
  background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius);
  padding: clamp(1.5rem, 3vw, 2.4rem); box-shadow: var(--shadow);
  display: flex; flex-direction: column;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}
.spot-card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 45%, var(--rule)); }
.spot-top { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.spot-name { font-size: clamp(1.9rem, 4vw, 2.6rem); font-weight: 600; letter-spacing: -0.02em; }
.spot-site { font-family: var(--font-mono); font-size: 0.82rem; color: var(--accent-ink); white-space: nowrap; }
.spot-site:hover { text-decoration: underline; text-underline-offset: 3px; }
.spot-tag { margin-top: 0.5rem; font-family: var(--font-display); font-size: 1.15rem; color: var(--ink); font-style: italic; }
.spot-desc { margin-top: 0.9rem; color: var(--ink-soft); font-size: 1rem; }

/* command chip */
.cmd {
  margin-top: 1.3rem; display: flex; align-items: center; justify-content: space-between; gap: 0.75rem;
  background: var(--paper-2); border: 1px solid var(--rule); border-radius: var(--radius-sm);
  padding: 0.55rem 0.6rem 0.55rem 0.85rem; font-family: var(--font-mono); font-size: 0.9rem;
}
.cmd code { color: var(--ink); overflow-x: auto; white-space: nowrap; }
.cmd-prompt { color: var(--accent-ink); user-select: none; margin-right: 0.5rem; }
.cmd-copy {
  flex: none; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.03em; text-transform: uppercase;
  background: transparent; border: 1px solid var(--rule); border-radius: 6px; color: var(--ink-soft);
  padding: 0.3rem 0.55rem; cursor: pointer; transition: all 0.15s var(--ease);
}
.cmd-copy:hover { border-color: var(--ink); color: var(--ink); }
.cmd-copy.is-copied { border-color: var(--accent-2); color: var(--accent-2); }

.chips { list-style: none; padding: 0; margin: 1.3rem 0 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.02em;
  padding: 0.28rem 0.6rem; border-radius: 999px; border: 1px solid var(--rule); color: var(--ink-soft);
  background: var(--paper);
}
.chip-lang { border-color: color-mix(in srgb, var(--accent) 40%, var(--rule)); color: var(--accent-ink); }

.spot-links { margin-top: auto; padding-top: 1.4rem; display: flex; gap: 1.25rem; }
.spot-links a { font-weight: 600; font-size: 0.95rem; color: var(--ink); border-bottom: 2px solid var(--accent); padding-bottom: 2px; transition: color 0.15s var(--ease); }
.spot-links a:hover { color: var(--accent-ink); }

/* ---- Jump-to-group nav ---- */
.jump-nav { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 0.75rem; margin-bottom: 0.5rem; }
.jump-label { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-faint); }
.jump-nav a {
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft);
  padding: 0.32rem 0.7rem; border: 1px solid var(--rule); border-radius: 999px;
  background: var(--card); transition: color 0.15s var(--ease), border-color 0.15s var(--ease), transform 0.15s var(--ease);
}
.jump-nav a:hover { color: var(--accent-ink); border-color: color-mix(in srgb, var(--accent) 45%, var(--rule)); transform: translateY(-1px); }

/* ---- Grouped project index ---- */
.group { padding-top: clamp(1.5rem, 3vw, 2.5rem); scroll-margin-top: 90px; }
.group + .group { margin-top: clamp(2rem, 4vw, 3rem); border-top: 1px dashed var(--rule); }
.group-head { margin-bottom: 1.5rem; }
.group-title { font-size: clamp(1.25rem, 2.6vw, 1.6rem); font-weight: 600; }
.group-desc { color: var(--ink-faint); margin-top: 0.35rem; font-size: 0.95rem; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1rem, 2vw, 1.35rem); }
.card {
  background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius);
  padding: 1.4rem 1.4rem 1.15rem; display: flex; flex-direction: column;
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}
.card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 40%, var(--rule)); box-shadow: var(--shadow); }
.card-title { font-size: 1.3rem; font-weight: 600; }
.card-desc { margin-top: 0.55rem; color: var(--ink-soft); font-size: 0.94rem; line-height: 1.55; flex: 1; }
.card-foot { margin-top: 1.15rem; display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; }
.card-links { display: flex; gap: 0.9rem; }
.card-links a { font-size: 0.86rem; font-weight: 600; color: var(--accent-ink); }
.card-links a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---- About ---- */
.about { max-width: 64ch; }
.about-lead { font-family: var(--font-display); font-size: clamp(1.4rem, 3vw, 2rem); line-height: 1.3; letter-spacing: -0.01em; }
.about p + p { margin-top: 1.2rem; color: var(--ink-soft); }
.about-links { margin-top: 1.8rem; display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; }
.about-links a { font-family: var(--font-mono); font-size: 0.88rem; color: var(--ink); border-bottom: 1px solid var(--rule); padding-bottom: 2px; }
.about-links a:hover { border-color: var(--accent); color: var(--accent-ink); }

/* =========================================================================
   Legal pages
   ========================================================================= */
.legal { max-width: 720px; padding-top: clamp(2.5rem, 6vw, 4.5rem); padding-bottom: clamp(3rem, 7vw, 5rem); }
.back-link { font-family: var(--font-mono); font-size: 0.85rem; color: var(--accent-ink); }
.back-link:hover { text-decoration: underline; text-underline-offset: 3px; }
.legal h1 { font-size: clamp(2.1rem, 5vw, 3rem); margin-top: 1.5rem; letter-spacing: -0.02em; }
.legal-meta { color: var(--ink-faint); font-family: var(--font-mono); font-size: 0.85rem; margin-top: 0.6rem; margin-bottom: 2rem; }
.legal p { margin-top: 1rem; color: var(--ink-soft); }
.legal p strong { color: var(--ink); font-weight: 600; display: inline-block; margin-top: 0.8rem; font-family: var(--font-display); font-size: 1.08rem; }
.legal a { color: var(--accent-ink); border-bottom: 1px solid var(--rule); }
.legal a:hover { border-color: var(--accent); }
.legal code { font-family: var(--font-mono); font-size: 0.88em; background: var(--paper-2); padding: 0.1em 0.35em; border-radius: 4px; }
.legal ul { margin: 0.7rem 0 0; padding-left: 1.2rem; color: var(--ink-soft); }
.legal li { margin-top: 0.4rem; }

/* =========================================================================
   Footer
   ========================================================================= */
.site-footer { border-top: 1px solid var(--rule); margin-top: clamp(2rem, 5vw, 4rem); background: var(--paper-2); }
.footer-inner { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 2rem; padding-block: clamp(2.5rem, 5vw, 3.5rem); }
.footer-brand .wordmark { font-size: 1.15rem; }
.footer-tagline { margin-top: 0.9rem; color: var(--ink-faint); font-size: 0.92rem; max-width: 30ch; }
.footer-col { display: flex; flex-direction: column; gap: 0.6rem; }
.footer-heading { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-faint); font-weight: 500; margin-bottom: 0.4rem; }
.footer-col a { color: var(--ink-soft); font-size: 0.94rem; width: fit-content; transition: color 0.15s var(--ease); }
.footer-col a:hover { color: var(--accent-ink); }
.footer-base { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; padding-block: 1.3rem; border-top: 1px solid var(--rule); color: var(--ink-faint); font-size: 0.85rem; }
.footer-made { font-family: var(--font-mono); }

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 860px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .section-note { margin-left: 0; flex-basis: 100%; }
}

@media (max-width: 700px) {
  .spotlight { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }

  /* mobile nav */
  .nav-toggle {
    display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 42px; height: 42px; padding: 0 9px; background: transparent;
    border: 1px solid var(--rule); border-radius: 10px; cursor: pointer;
  }
  .nav-toggle-bar { display: block; height: 2px; width: 100%; background: var(--ink); border-radius: 2px; transition: transform 0.2s var(--ease), opacity 0.2s var(--ease); }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child { transform: translateY(3.5px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child { transform: translateY(-3.5px) rotate(-45deg); }

  .primary-nav {
    position: fixed; inset: 66px 0 auto 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--rule);
    padding: 0.5rem var(--gutter) 1.25rem;
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
  }
  .primary-nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .primary-nav > a { width: 100%; padding: 0.85rem 0; border-bottom: 1px solid var(--rule-soft); font-size: 1.05rem; }
  .primary-nav > a:not(.nav-gh)::after { display: none; }
}

@media (max-width: 440px) {
  .footer-inner { grid-template-columns: 1fr; }
  .hero-title { font-size: clamp(2.6rem, 15vw, 4rem); }
}