/* ============================================
   TWETO ARCHITECTURE — SHARED STYLESHEET
   ============================================ */

/* ---- Design Tokens ---- */
:root {
  --font-primary: 'gill-sans-nova', 'Gill Sans', 'Gill Sans MT', 'Libre Franklin', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --wt-light: 300; --wt-regular: 400; --wt-medium: 500;
  --text-xs: 0.75rem; --text-sm: 0.875rem; --text-base: 1.125rem; --text-lg: 1.125rem;
  --text-xl: 1.25rem; --text-2xl: 1.5rem; --text-3xl: 1.875rem; --text-4xl: 2.25rem;
  --leading-tight: 1.15; --leading-snug: 1.3; --leading-normal: 1.6;
  --tracking-tight: -0.01em; --tracking-wide: 0.06em; --tracking-wider: 0.12em;
  --ink: #1a1a1a; --ink-light: #4a4a4a; --ink-muted: #767676;
  --bg: #ffffff; --bg-warm: #f8f7f5; --bg-warm-alt: #f0efec;
  --border: #d4d0c8; --accent: #2c5545; --accent-hover: #1e3d30;
  --space-xs: 0.5rem; --space-sm: 1rem; --space-md: 1.5rem; --space-lg: 2.5rem;
  --space-xl: 3.5rem; --space-2xl: 5rem; --max-w: 1200px; --max-w-narrow: 720px; --gutter: 2rem;
  --rule: 1px solid var(--border); --rule-accent: 2px solid var(--accent); --ease: 0.3s ease;
  --btn-pad: 0.75rem 2rem; --btn-fs: var(--text-sm); --btn-ls: var(--tracking-wide);
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-primary); font-weight: var(--wt-regular); color: var(--ink); background: var(--bg); line-height: var(--leading-normal); }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }

/* ---- Layout ---- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--gutter); }

/* ---- Typography Utilities ---- */
.section-heading { font-size: var(--text-3xl); font-weight: var(--wt-light); letter-spacing: var(--tracking-tight); line-height: var(--leading-tight); margin-bottom: var(--space-md); }
.project-type { font-size: var(--text-xs); font-weight: var(--wt-medium); letter-spacing: var(--tracking-wider); text-transform: uppercase; color: var(--ink-muted); margin-bottom: var(--space-xs); }

/* ---- Buttons ---- */
.btn { display: inline-block; padding: var(--btn-pad); font-family: var(--font-primary); font-size: var(--btn-fs); font-weight: var(--wt-medium); letter-spacing: var(--btn-ls); text-transform: uppercase; border: none; cursor: pointer; transition: all var(--ease); }
.btn-primary { background: var(--accent); color: var(--bg); border: 1.5px solid var(--accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-outline { background: transparent; color: var(--accent); border: 1.5px solid var(--accent); }
.btn-outline:hover { background: var(--accent); color: var(--bg); }
.btn-text { background: none; border: none; padding: 0; color: var(--accent); font-size: var(--text-sm); font-weight: var(--wt-medium); letter-spacing: var(--tracking-wide); text-transform: uppercase; cursor: pointer; }
.btn-text::after { content: ' \2192'; transition: margin var(--ease); }
.btn-text:hover::after { margin-left: 4px; }
.btn-cta-inv { display: inline-block; padding: var(--btn-pad); font-family: var(--font-primary); font-size: var(--btn-fs); font-weight: var(--wt-medium); letter-spacing: var(--btn-ls); text-transform: uppercase; background: transparent; color: var(--bg); border: 1.5px solid rgba(255,255,255,0.6); cursor: pointer; transition: all var(--ease); }
.btn-cta-inv:hover { background: var(--bg); color: var(--accent); border-color: var(--bg); }

/* ---- Focus (keyboard accessibility) ---- */
/* Visible outline on keyboard navigation via :focus-visible; not shown for plain mouse clicks.
   Text inputs still surface it on click per browser heuristics, which is the desired behavior. */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
/* Accent green is invisible on the green CTA sections — use a white outline there. */
.btn-cta-inv:focus-visible { outline-color: var(--bg); }

/* ---- Header ---- */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(255,255,255,0.97); border-bottom: 1.5px solid var(--border); backdrop-filter: blur(8px); }
.header-inner { max-width: var(--max-w); margin: 0 auto; padding: 1.75rem var(--gutter); display: flex; align-items: center; justify-content: space-between; }
.site-wordmark { font-size: var(--text-lg); font-weight: var(--wt-regular); letter-spacing: var(--tracking-wide); text-transform: uppercase; }
.site-wordmark strong { font-weight: 500; }
.site-nav { display: flex; align-items: center; gap: 2.5rem; }
.site-nav a { font-size: var(--text-xs); font-weight: var(--wt-medium); letter-spacing: var(--tracking-wider); text-transform: uppercase; color: var(--ink-muted); transition: color var(--ease); }
.site-nav a:hover { color: var(--ink); }
.site-nav .nav-cta { color: var(--accent); }
.site-nav .nav-active { color: var(--ink); }

/* ---- Page Header (interior pages) ---- */
.page-header { padding-top: calc(var(--space-lg) + 74px); padding-bottom: var(--space-lg); border-bottom: var(--rule); }
.page-title { font-size: var(--text-3xl); font-weight: var(--wt-light); letter-spacing: var(--tracking-tight); line-height: var(--leading-tight); }
.page-intro { font-size: var(--text-lg); font-weight: var(--wt-regular); line-height: var(--leading-normal); color: var(--ink-light); max-width: var(--max-w-narrow); margin-top: var(--space-md); }

/* ---- CTA Section ---- */
.section-cta { padding: 4.25rem 0; background: var(--accent); color: var(--bg); text-align: center; }
.cta-heading { font-size: var(--text-3xl); font-weight: var(--wt-light); letter-spacing: var(--tracking-tight); margin-bottom: var(--space-sm); }
.cta-body { font-size: var(--text-lg); opacity: 0.8; margin-bottom: var(--space-lg); max-width: 640px; margin-left: auto; margin-right: auto; }

/* ---- Projects Grid + Cards (homepage featured + Work index) ---- */
.projects-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
.project-card { background: var(--bg); overflow: hidden; cursor: pointer; transition: box-shadow var(--ease); }
.project-card:hover { box-shadow: 0 4px 24px rgba(0,0,0,0.08); }
.project-card-image { aspect-ratio: 3/2; background: var(--bg-warm); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.project-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--ease); }
.project-card:hover .project-card-image img { transform: scale(1.02); }
.project-status { display: inline-block; background: var(--bg-warm); padding: 0.15rem 0.5rem; font-size: var(--text-xs); font-weight: var(--wt-medium); letter-spacing: var(--tracking-wider); text-transform: uppercase; color: var(--accent); margin-left: 0.4rem; vertical-align: middle; }
.project-info { padding: var(--space-md) var(--space-md) var(--space-lg); }
.project-name { font-size: var(--text-xl); font-weight: var(--wt-regular); letter-spacing: var(--tracking-tight); margin-bottom: 0.25rem; }
.project-desc { font-size: var(--text-sm); line-height: var(--leading-normal); color: var(--ink-light); }
@media (max-width: 900px) { .projects-grid { grid-template-columns: 1fr; } }

/* ---- Project Page Layout ---- */
.project-page { max-width: var(--max-w); margin: 0 auto; padding: calc(var(--space-2xl) + 74px) var(--gutter) var(--space-2xl); }
.project-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.cell { min-height: 0; }
.cell img { width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: contain; background: var(--bg); padding: 0.25rem; box-sizing: border-box; }
.cell-text { display: flex; flex-direction: column; justify-content: center; padding: var(--space-lg) var(--space-md); }
.cell-text h1 { font-size: var(--text-3xl); font-weight: var(--wt-light); letter-spacing: var(--tracking-tight); line-height: var(--leading-tight); margin-bottom: var(--space-xs); }
.cell-text .project-type { font-size: calc(var(--text-xs) * 1.05); font-weight: var(--wt-medium); letter-spacing: var(--tracking-wider); text-transform: uppercase; color: var(--ink-muted); margin-bottom: var(--space-md); }
.cell-text p { font-size: var(--text-base); line-height: var(--leading-normal); color: var(--ink-light); margin-bottom: 0.585rem; }
.cell-text p:last-child { margin-bottom: 0; }
.cell-text .credits { font-size: calc(var(--text-xs) * 1.20); color: var(--ink-muted); margin-top: var(--space-md); }
.cell-text .credits a { color: var(--accent); }
.cell-label { position: relative; }
.cell-label span { position: absolute; bottom: var(--space-sm); left: var(--space-sm); background: rgba(255,255,255,0.9); padding: 0.2rem 0.6rem; font-size: var(--text-xs); font-weight: var(--wt-medium); letter-spacing: var(--tracking-wider); text-transform: uppercase; color: var(--ink-muted); }
.cell.cell-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; padding: 0.25rem; background: var(--bg); box-sizing: border-box; aspect-ratio: 3 / 2; }
.cell.cell-pair > img,
.cell.cell-pair > .cell-label img { width: 100%; height: 100%; aspect-ratio: auto; object-fit: cover; padding: 0; background: none; }
.cell.cell-pair > .cell-label { position: relative; overflow: hidden; min-height: 0; }
.cell.cell-pair > .cell-label span { bottom: var(--space-xs); left: var(--space-xs); }
.project-footer { grid-column: 1 / -1; display: flex; align-items: center; justify-content: center; gap: var(--space-lg); padding: var(--space-xl) 0 var(--space-md); border-top: var(--rule); margin-top: var(--space-md); }

/* ---- Lightbox ---- */
.lightbox-trigger { cursor: zoom-in; }
.lightbox { position: fixed; inset: 0; background: rgba(255,255,255,0.98); display: none; flex-direction: column; align-items: center; justify-content: center; z-index: 200; padding: 2rem; }
.lightbox.open { display: flex; }
.lightbox-img { max-width: 1000px; width: 100%; height: auto; max-height: 85vh; object-fit: contain; }
.lightbox-caption-row { display: flex; align-items: center; gap: var(--space-md); margin-top: var(--space-md); }
.lightbox-caption { font-size: var(--text-xs); font-weight: var(--wt-medium); letter-spacing: var(--tracking-wider); text-transform: uppercase; color: var(--ink-muted); margin: 0; }
.lightbox-arrow { background: transparent; border: none; color: var(--ink-muted); font-size: calc(var(--text-xs) * 1.05); line-height: 1; cursor: pointer; padding: 0; font-family: var(--font-primary); }
.lightbox-arrow:hover { color: var(--ink-light); }
.lightbox-close { position: absolute; top: 1.25rem; right: max(1rem, calc(0.75rem + (100vw - 1000px) / 4)); background: transparent; border: none; color: var(--ink); font-size: 2.5rem; line-height: 1; cursor: pointer; font-family: var(--font-primary); font-weight: 300; }
.lightbox-close:hover { color: var(--ink-muted); }
@media (max-width: 768px) {
  .lightbox-trigger { cursor: default; }
  .lightbox { display: none !important; }
}

/* ---- Project page opening block — explicit grid placement ---- */
/* Desktop: explicit placement replicates the original auto-flow layout exactly. */
/* Mobile: HTML source order is the reading order — img-a/img-b precede comprehensive */
/* in source, so they stack right after the intro on a single column. Desktop ignores */
/* source order because every opening-block cell is placed explicitly below. */
@media (min-width: 769px) {
  .pg-hero          { grid-column: 1; grid-row: 1; padding-top: 8.6rem; }
  .pg-intro         { grid-column: 2; grid-row: 1; justify-content: flex-start; }
  .pg-img-a         { grid-column: 2; grid-row: 2; }
  .pg-img-b         { grid-column: 2; grid-row: 3; }
  .pg-comprehensive { grid-column: 1; grid-row: 2 / 4; overflow: hidden; contain: size; }
}

/* ---- Hamburger Toggle ---- */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
}

/* ---- Footer ---- */
.site-footer { padding: var(--space-lg) 0; border-top: var(--rule); text-align: center; }
.footer-text { font-size: var(--text-xs); color: var(--ink-muted); letter-spacing: var(--tracking-wide); }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .site-nav { gap: 1.5rem; }
}
@media (max-width: 768px) {
  .project-grid { grid-template-columns: 1fr; }
  /* Mobile reading order: heading, hero, intro+credits, the two images, long text, then rest. */
  /* display:contents lets the intro's heading (.pg-heading) and body (.pg-introbody) be */
  /* ordered independently. order overrides source order on mobile only — desktop uses */
  /* explicit grid placement (min-width:769px), so this block never affects desktop. */
  .pg-intro     { display: contents; }
  .project-grid > * { order: 9; }
  .pg-heading       { order: 1; padding: 0 var(--space-md) var(--space-sm); }
  .pg-hero          { order: 2; }
  .pg-introbody     { order: 3; padding: 0 var(--space-md) var(--space-lg); }
  .pg-img-a         { order: 4; }
  .pg-img-b         { order: 5; }
  .pg-comprehensive { order: 6; }
}
@media (max-width: 600px) {
  :root {
    --gutter: 1.25rem;
    --space-xl: 2rem;
    --space-2xl: 2.5rem;  }
  .nav-toggle { display: flex; }
  .site-nav {
    display: none;
    position: fixed;
    top: 74px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(8px);
    border-bottom: 1.5px solid var(--border);
    padding: 0.5rem var(--gutter) 1rem;
    z-index: 99;
  }
  .site-nav.nav-open { display: flex; }
  .site-nav a { padding: 0.65rem 0; border-bottom: 1px solid var(--border); }
  .site-nav a:last-child { border-bottom: none; }
}

/* ---- Journal suppressed at launch — remove these rules to restore ---- */
.site-nav a[href="journal.html"] { display: none; }
.section-journal { display: none; }