/* ==========================================================================
   Tokens
   ========================================================================== */
:root {
  --ink: #1c2430;
  --ink-soft: #414b58;
  --paper: #eeece3;
  --paper-raised: #f6f5ef;
  --line: #c9c5b6;
  --line-strong: #1c2430;
  --steel: #3b6e8f;
  --rust: #b5502d;
  --concrete: #8d897a;

  --font-display: "Big Shoulders Display", sans-serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --wrap: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 2px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #ece8dd;
    --ink-soft: #b9b4a5;
    --paper: #161a20;
    --paper-raised: #1d222a;
    --line: #333a45;
    --line-strong: #ece8dd;
    --steel: #7fb1cf;
    --rust: #d97a51;
    --concrete: #6d7280;
  }
}

/* ==========================================================================
   Reset
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 90px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
ul, ol, dl { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-family: var(--font-display); font-weight: 700; line-height: 1.02; letter-spacing: 0.01em; }
p { margin: 0 0 1em; max-width: 62ch; }
button { font-family: inherit; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

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

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper);
  padding: 0.75em 1.25em; z-index: 200; font-family: var(--font-mono); font-size: 0.85rem;
}
.skip-link:focus { left: 1rem; top: 1rem; }

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* corner registration marks (decorative) */
.sheet-marks { position: fixed; inset: 0; pointer-events: none; z-index: 150; }
.mark { position: fixed; width: 18px; height: 18px; }
.mark::before, .mark::after { content: ""; position: absolute; background: var(--line-strong); opacity: 0.35; }
.mark::before { width: 100%; height: 1px; top: 50%; }
.mark::after { height: 100%; width: 1px; left: 50%; }
.mark--tl { top: 14px; left: 14px; }
.mark--tr { top: 14px; right: 14px; }
.mark--bl { bottom: 14px; left: 14px; }
.mark--br { bottom: 14px; right: 14px; }
@media (max-width: 640px) { .sheet-marks { display: none; } }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px;
}
.brand { display: flex; align-items: center; gap: 0.7rem; text-decoration: none; }
.brand-mark {
  display: grid; place-items: center;
  width: 38px; height: 38px;
  border: 1.5px solid var(--line-strong);
  font-family: var(--font-mono); font-size: 0.8rem; font-weight: 500;
}
.brand-text { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; }

.site-nav ul { display: flex; gap: 2rem; }
.site-nav a {
  text-decoration: none; font-size: 0.92rem; font-weight: 500;
  padding-bottom: 4px; border-bottom: 1px solid transparent;
}
.site-nav a:hover, .site-nav a.is-active { border-bottom-color: var(--rust); }

.nav-toggle {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px; background: none; border: 1px solid var(--line); cursor: pointer;
}
.nav-toggle span { display: block; height: 1.5px; width: 18px; margin: 0 auto; background: var(--ink); }

@media (max-width: 800px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed; inset: 76px 0 auto 0; background: var(--paper-raised);
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }
  .site-nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .site-nav ul { flex-direction: column; gap: 0; padding: 0.5rem var(--gutter) 1.5rem; }
  .site-nav a { display: block; padding: 0.85rem 0; border-bottom: 1px solid var(--line); }
}

/* ==========================================================================
   Hero / Introduction
   ========================================================================== */
.hero { position: relative; overflow: hidden; }
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.35;
  mask-image: linear-gradient(to bottom, black, transparent 92%);
}
.hero-inner {
  position: relative;
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 3rem; align-items: center;
  padding-block: clamp(3rem, 8vw, 6rem);
}
.hero-eyebrow {
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--steel);
  margin: 0 0 1rem; letter-spacing: 0.02em;
}
.hero-title {
  font-size: clamp(3.2rem, 9vw, 6rem);
  margin: 0 0 0.9rem;
}
.hero-lede { font-size: 1.15rem; color: var(--ink-soft); max-width: 46ch; }
.hero-actions { display: flex; gap: 1rem; margin-top: 1.75rem; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 0.5em;
  font-family: var(--font-body); font-weight: 600; font-size: 0.95rem;
  padding: 0.85em 1.5em; border: 1.5px solid var(--line-strong);
  text-decoration: none; border-radius: var(--radius);
  transition: background 0.15s ease, color 0.15s ease;
}
.btn--primary { background: var(--ink); color: var(--paper); }
.btn--primary:hover { background: var(--rust); border-color: var(--rust); }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }

.hero-panel { position: relative; }
.hero-svg { width: 100%; height: auto; }
.hero-svg .draw-line { stroke: var(--line-strong); stroke-width: 1.5; }
.hero-svg .draw-line.thick { stroke-width: 2.5; }
.hero-svg .truss line { stroke: var(--steel); stroke-width: 2; }
.hero-svg .dim-line { stroke: var(--concrete); stroke-width: 1; }
.hero-svg .dim-text { font-family: var(--font-mono); font-size: 12px; fill: var(--ink-soft); }

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-panel { order: -1; }
}

/* ==========================================================================
   Section scaffolding
   ========================================================================== */
.section { padding-block: clamp(3.5rem, 8vw, 6rem); position: relative; }
.section::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0;
  height: 1px; background: var(--line);
}
.section--alt { background: var(--paper-raised); }

.section-head {
  display: flex; align-items: baseline; gap: 1rem; margin-bottom: 2.5rem;
  flex-wrap: wrap;
}
.sheet-no {
  font-family: var(--font-mono); font-size: 0.85rem; color: var(--steel);
  border: 1px solid var(--steel); padding: 0.15em 0.55em; border-radius: var(--radius);
}
.section-head h2 { font-size: clamp(2rem, 4vw, 2.6rem); }

/* ==========================================================================
   Skills & Tools
   ========================================================================== */
.skills-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px; background: var(--line); border: 1px solid var(--line);
}
.skill-group { background: var(--paper); padding: 1.75rem; }
.skill-group h3 { font-size: 1.2rem; margin-bottom: 1rem; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.skill-tags li {
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink);
  border: 1px solid var(--line); padding: 0.35em 0.75em; border-radius: var(--radius);
}

/* ==========================================================================
   Projects
   ========================================================================== */
.project-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.75rem;
}
.project-card {
  background: var(--paper-raised); border: 1px solid var(--line);
  display: flex; flex-direction: column; overflow: hidden;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.project-card:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.project-media { aspect-ratio: 16 / 10; background: var(--line); overflow: hidden; }
.project-media img { width: 100%; height: 100%; object-fit: cover; }
.project-body { padding: 1.5rem; display: flex; flex-direction: column; gap: 0.5rem; flex: 1; }
.project-body h3 { font-size: 1.35rem; }
.project-meta { font-family: var(--font-mono); font-size: 0.75rem; color: var(--ink-soft); margin-bottom: 0.4rem; }
.project-body p:not(.project-meta) { font-size: 0.92rem; color: var(--ink-soft); margin-bottom: 0.75rem; }
.project-link { margin-top: auto; font-weight: 600; font-size: 0.9rem; text-decoration: none; color: var(--rust); }
.project-link:hover { text-decoration: underline; }

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-details { max-width: 420px; }
.contact-details div { display: flex; gap: 1rem; padding: 0.9rem 0; border-top: 1px solid var(--line); }
.contact-details div:last-child { border-bottom: 1px solid var(--line); }
.contact-details dt { font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft); width: 80px; flex-shrink: 0; }
.contact-details dd { margin: 0; }
.contact-details a { text-decoration: none; font-weight: 500; font-size: 1.05rem; }
.contact-details a:hover { color: var(--rust); }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer { border-top: 1px solid var(--line); padding-block: 2rem; }
.site-footer p { margin: 0; font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-soft); }