/* ==========================================================================
   Friends of Austrans - shared design system
   Aesthetic: 90s tech-optimism / transit-brochure blueprint
   Single locked dark theme (navy + forest green), by design.
   ========================================================================== */

@font-face {
  font-family: 'Chakra Petch';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../assets/fonts/chakra-petch-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Chakra Petch';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../assets/fonts/chakra-petch-600.woff2') format('woff2');
}
@font-face {
  font-family: 'Chakra Petch';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../assets/fonts/chakra-petch-700.woff2') format('woff2');
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../assets/fonts/ibm-plex-mono-400.woff2') format('woff2');
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../assets/fonts/ibm-plex-mono-500.woff2') format('woff2');
}
@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../assets/fonts/ibm-plex-mono-600.woff2') format('woff2');
}
@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('../assets/fonts/ibm-plex-sans-variable.woff2') format('woff2');
}

/* ---------- Design tokens ---------- */
:root {
  /* base surfaces (navy -> deep forest green family) */
  --navy-950: #05090f;
  --navy-900: #0a1420;
  --navy-800: #101f2e;
  --navy-700: #172c3f;
  --green-900: #081712;
  --green-800: #0d221a;

  --line: rgba(226, 240, 234, 0.09);
  --line-strong: rgba(226, 240, 234, 0.18);

  --text-primary: #edf3ef;
  --text-secondary: #a3b8b0;
  --text-tertiary: #6f857c;

  --accent: #4fd6b5;
  --accent-strong: #8bf0d6;
  --accent-dim: rgba(79, 214, 181, 0.14);
  --accent-line: rgba(79, 214, 181, 0.35);

  --font-display: 'Chakra Petch', 'Arial Narrow', sans-serif;
  --font-body: 'IBM Plex Sans', -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Consolas', monospace;

  --radius: 3px;
  --container: 1200px;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Reset ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
body {
  margin: 0;
  background: var(--navy-900);
  background-image:
    linear-gradient(160deg, var(--navy-900) 0%, var(--navy-900) 55%, var(--green-900) 100%),
    repeating-linear-gradient(0deg, var(--line) 0px, var(--line) 1px, transparent 1px, transparent 64px),
    repeating-linear-gradient(90deg, var(--line) 0px, var(--line) 1px, transparent 1px, transparent 64px);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; margin: 0 0 0.6em; letter-spacing: 0.01em; }
p { margin: 0 0 1em; color: var(--text-secondary); max-width: 65ch; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; }

.icon { width: 1.1em; height: 1.1em; vertical-align: -0.15em; }
.icon-lg { width: 22px; height: 22px; }

/* ---------- Layout ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 88px 0; position: relative; }
.section--tight { padding: 56px 0; }
.section--tint {
  background: linear-gradient(180deg, transparent, rgba(13, 34, 26, 0.55) 12%, rgba(13, 34, 26, 0.55) 88%, transparent);
}
.section-head { max-width: 640px; margin-bottom: 48px; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); color: var(--text-primary); }
.section-head p { font-size: 1.05rem; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: 68px;
  display: flex;
  align-items: center;
  background: rgba(10, 20, 32, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-primary);
  white-space: nowrap;
}
.brand-mark {
  width: 30px;
  height: 30px;
  border: 1px solid var(--accent-line);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}
.brand-mark .icon { width: 16px; height: 16px; }
.brand small { display: block; font-family: var(--font-mono); font-weight: 400; font-size: 0.62rem; letter-spacing: 0.1em; color: var(--text-tertiary); text-transform: uppercase; }

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text-secondary);
  padding: 6px 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
  white-space: nowrap;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent-strong); border-color: var(--accent-line); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    inset: 68px 0 auto 0;
    background: var(--navy-950);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 20px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
  }
  .nav.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .nav a { width: 100%; padding: 14px 0; border-bottom: 1px solid var(--line); }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 13px 22px;
  border: 1px solid var(--accent-line);
  color: var(--navy-950);
  background: var(--accent);
  border-radius: var(--radius);
  white-space: nowrap;
  transition: transform 0.15s var(--ease), background 0.15s var(--ease), box-shadow 0.2s var(--ease);
}
.btn:hover { background: var(--accent-strong); box-shadow: 0 0 0 1px var(--accent-line), 0 0 28px var(--accent-dim); }
.btn:active { transform: scale(0.98); }
.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--line-strong);
}
.btn--ghost:hover { border-color: var(--accent-line); color: var(--accent-strong); background: var(--accent-dim); box-shadow: none; }

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 56px 0 80px;
  min-height: 0;
}
.hero-copy h1 {
  font-size: clamp(2rem, 4.4vw, 3.1rem);
  color: var(--text-primary);
}
.hero-copy h1 em { color: var(--accent-strong); font-style: normal; }
.hero-copy p { font-size: 1.1rem; max-width: 46ch; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.hero-figure {
  position: relative;
  border: 1px solid var(--line-strong);
  padding: 10px;
  background: rgba(8, 16, 25, 0.5);
}
.hero-figure img { width: 100%; height: auto; }
.hero-figure figcaption {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  padding: 10px 4px 2px;
}
.hero-figure::before {
  content: '';
  position: absolute;
  inset: -1px;
  border: 1px solid var(--accent-line);
  opacity: 0.5;
  clip-path: polygon(0 0, 22px 0, 22px 2px, 2px 2px, 2px 22px, 0 22px);
  pointer-events: none;
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 32px; }
  .hero-figure { order: -1; }
}

/* ---------- Stat strip ---------- */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stat {
  padding: 26px 22px;
  border-left: 1px solid var(--line);
}
.stat:first-child { border-left: none; }
.stat .value { display: block; font-family: var(--font-mono); font-size: 1.9rem; color: var(--accent-strong); font-weight: 600; }
.stat .label { display: block; font-size: 0.82rem; color: var(--text-tertiary); margin-top: 4px; }

@media (max-width: 760px) {
  .stat-strip { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: none; }
  .stat:nth-child(3), .stat:nth-child(4) { border-top: 1px solid var(--line); }
}

/* ---------- Bento teaser grid (Home) ---------- */
.bento {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 180px;
  gap: 16px;
}
.bento-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--navy-800);
  text-decoration: none;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 22px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.bento-card:hover { border-color: var(--accent-line); transform: translateY(-3px); }
.bento-card h3 { font-size: 1.15rem; margin-bottom: 6px; }
.bento-card p { font-size: 0.88rem; margin: 0; color: var(--text-secondary); max-width: 32ch; }
.bento-card .card-tag { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; }
.bento-card--feature { grid-column: span 2; grid-row: span 2; }
.bento-card--feature img, .bento-card--image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  opacity: 0.55;
  transition: opacity 0.25s var(--ease), transform 0.4s var(--ease);
}
.bento-card--feature:hover img, .bento-card--image:hover img { opacity: 0.72; transform: scale(1.03); }
.bento-card--feature::after, .bento-card--image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(6,12,18,0.92) 10%, rgba(6,12,18,0.15) 70%);
  z-index: 0;
}
.bento-card--feature > *, .bento-card--image > * { position: relative; z-index: 1; }

@media (max-width: 900px) {
  .bento { grid-template-columns: repeat(2, 1fr); }
  .bento-card--feature { grid-column: span 2; }
}
@media (max-width: 560px) {
  .bento { grid-template-columns: 1fr; }
  .bento-card--feature { grid-column: span 1; }
  .bento-card { grid-row: span 1 !important; grid-column: span 1 !important; min-height: 160px; }
}

/* ---------- Timeline (History page) ---------- */
.timeline { position: relative; padding-left: 32px; border-left: 1px solid var(--line-strong); }
.timeline-item { position: relative; padding-bottom: 48px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -37px;
  top: 4px;
  width: 9px;
  height: 9px;
  background: var(--navy-900);
  border: 2px solid var(--accent);
}
.timeline-year {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-strong);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
  display: block;
}
.timeline-item h3 { font-size: 1.2rem; margin-bottom: 8px; }
.timeline-item p { max-width: 60ch; }

/* ---------- Two-column grouped lists (Technology comparisons) ---------- */
.split-groups {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.group-block h3 {
  font-size: 1rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
  margin-bottom: 4px;
}
.group-block ul { margin-top: 12px; }
.group-block li { padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--text-secondary); }
.group-block li:last-child { border-bottom: none; }
.group-block li strong { color: var(--text-primary); display: block; margin-bottom: 3px; font-weight: 600;}

@media (max-width: 760px) {
  .split-groups { grid-template-columns: 1fr; gap: 8px; }
}

/* ---------- Spec grid (vehicle dimensions etc.) ---------- */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.spec-cell { background: var(--navy-900); padding: 22px; }
.spec-cell .value { display: block; font-family: var(--font-mono); font-size: 1.4rem; color: var(--accent-strong); }
.spec-cell .label { font-size: 0.8rem; color: var(--text-tertiary); }
@media (max-width: 700px) { .spec-grid { grid-template-columns: repeat(2, 1fr); } }

/* ---------- Diagram figures with labels ---------- */
.diagram-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.diagram-block figure { margin: 0; border: 1px solid var(--line-strong); background: var(--navy-950); padding: 16px; }
.diagram-block figcaption { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-tertiary); margin-top: 10px; }
.diagram-block.reverse { grid-template-columns: 1fr 1fr; }
.diagram-block.reverse figure { order: 2; }
@media (max-width: 800px) {
  .diagram-block, .diagram-block.reverse { grid-template-columns: 1fr; }
  .diagram-block.reverse figure { order: 0; }
}

/* ---------- Gallery ---------- */
.gallery-grid {
  columns: 3 260px;
  column-gap: 16px;
}
.gallery-item {
  break-inside: avoid;
  margin-bottom: 16px;
  border: 1px solid var(--line);
  background: var(--navy-800);
  cursor: pointer;
  overflow: hidden;
}
.gallery-item img { width: 100%; height: auto; display: block; transition: transform 0.35s var(--ease), opacity 0.2s var(--ease); }
.gallery-item:hover img { transform: scale(1.04); }
.gallery-item figcaption { padding: 12px 14px 14px; }
.gallery-item .cap-kind { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); display: block; margin-bottom: 4px; }
.gallery-item .cap-text { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.5; }

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(5, 9, 15, 0.92);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}
.lightbox.is-open { display: flex; }
.lightbox-inner { max-width: 900px; width: 100%; }
.lightbox-inner img { width: 100%; height: auto; border: 1px solid var(--line-strong); max-height: 72vh; object-fit: contain; background: var(--navy-950); }
.lightbox-cap { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-secondary); margin-top: 14px; }
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: none;
  border: 1px solid var(--line-strong);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.lightbox-close:hover { border-color: var(--accent-line); color: var(--accent-strong); }

@media (max-width: 700px) {
  .gallery-grid { columns: 1 100%; }
}

/* ---------- Simple lists (Sources page) ---------- */
.source-group { margin-bottom: 40px; }
.source-group h3 { font-size: 1.05rem; color: var(--text-primary); margin-bottom: 4px; }
.source-list { border-top: 1px solid var(--line); }
.source-list li { border-bottom: 1px solid var(--line); }
.source-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 4px;
  text-decoration: none;
  color: var(--text-primary);
  transition: color 0.2s var(--ease);
}
.source-list a:hover { color: var(--accent-strong); }
.source-list .src-desc { font-size: 0.85rem; color: var(--text-tertiary); font-weight: 400; display: block; margin-top: 3px; }
.source-list .src-title { font-weight: 600; }

.callout {
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--accent);
  background: var(--accent-dim);
  padding: 20px 24px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}
.callout strong { color: var(--text-primary); }

/* ---------- Status page log ---------- */
.log-entry { padding: 22px 0; border-bottom: 1px solid var(--line); }
.log-entry:last-child { border-bottom: none; }
.log-date { font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent); letter-spacing: 0.04em; }
.log-entry h3 { font-size: 1.1rem; margin: 6px 0 8px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 48px 0 36px;
  background: var(--navy-950);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
.footer-grid h4 { font-family: var(--font-mono); font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-tertiary); margin-bottom: 14px; }
.footer-grid a { display: block; font-size: 0.9rem; color: var(--text-secondary); text-decoration: none; padding: 5px 0; }
.footer-grid a:hover { color: var(--accent-strong); }
.footer-note { font-size: 0.82rem; color: var(--text-tertiary); border-top: 1px solid var(--line); padding-top: 24px; max-width: 80ch; }
@media (max-width: 700px) {
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Utility ---------- */
.mt-0 { margin-top: 0; }
.text-center { text-align: center; }
.disclaimer-bar {
  background: var(--green-800);
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-secondary);
  text-align: center;
  letter-spacing: 0.02em;
}
.disclaimer-bar strong { color: var(--accent-strong); }