/* ─────────────────────────────────────────────────────────
   Shared styles for project writeup pages
───────────────────────────────────────────────────────── */
:root {
  --bg:           #0A0A0A;
  --bg-surface:   #111111;
  --bg-card:      #161616;
  --ink:          #F0EEE8;
  --ink-muted:    #C8C4BB;
  --ink-faint:    #3A3A38;
  --accent:       #00D4AA;
  --accent-dim:   rgba(0, 212, 170, 0.10);
  --border:       rgba(255, 255, 255, 0.07);

  --font-display: 'Bricolage Grotesque', system-ui, sans-serif;
  --font-body:    'IBM Plex Sans', system-ui, sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;

  --max-w: 780px;
  --pad-x: clamp(1.5rem, 5vw, 3rem);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
}

a { color: inherit; text-decoration: none; }

/* ── Nav ───────────────────────────────────────────────── */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem var(--pad-x);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 100;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--accent);
  font-weight: 500;
}

.nav-back {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ink-muted);
  letter-spacing: 0.05em;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-back:hover { color: var(--ink); }

/* ── Hero ──────────────────────────────────────────────── */
.project-hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem var(--pad-x) 3rem;
  border-bottom: 1px solid var(--border);
}

.project-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: block;
}

.project-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--ink);
  margin-bottom: 1.25rem;
}

.project-summary {
  font-size: 1.125rem;
  color: var(--ink-muted);
  font-weight: 300;
  max-width: 56ch;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.meta-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.meta-value {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.75rem;
}

.project-tags span {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  border: 1px solid var(--border);
  padding: 0.3rem 0.65rem;
  border-radius: 2px;
}

/* ── Impact metrics bar ────────────────────────────────── */
.impact-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin: 2rem 0 2.5rem;
}

.impact-stat {
  background: var(--bg-card);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: background 0.25s;
}

.impact-stat:hover { background: var(--bg-surface); }

.impact-value {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--accent);
  line-height: 1;
}

.impact-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  line-height: 1.4;
}

/* ── Writeup body ──────────────────────────────────────── */
.writeup {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3.5rem var(--pad-x) 6rem;
}

/* Section headings */
.writeup h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.375rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border);
}

.writeup h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }

.writeup h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--ink);
  margin-top: 2rem;
  margin-bottom: 0.625rem;
}

/* Body text */
.writeup p {
  font-size: 1rem;
  color: var(--ink-muted);
  font-weight: 300;
  line-height: 1.85;
  margin-bottom: 1.125rem;
  max-width: 66ch;
}

.writeup strong { color: var(--ink); font-weight: 600; }

.writeup em {
  font-style: normal;
  color: var(--accent);
}

/* Lists */
.writeup ul, .writeup ol {
  margin: 0 0 1.25rem 0;
  padding-left: 1.5rem;
  color: var(--ink-muted);
  font-weight: 300;
}

.writeup li {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 0.4rem;
}

.writeup li::marker { color: var(--accent); }

/* Callout / highlight box */
.callout {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
  border-radius: 2px;
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
}

.callout-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
}

.callout p {
  margin-bottom: 0;
  font-size: 0.9375rem;
}

/* Trade-off table */
.tradeoff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin: 1.75rem 0;
}

.tradeoff-col {
  background: var(--bg-card);
  padding: 1.25rem 1.5rem;
}

.tradeoff-col h4 {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.875rem;
}

.tradeoff-col.pro h4  { color: var(--accent); }
.tradeoff-col.con h4  { color: #FF6B6B; }

.tradeoff-col ul {
  padding-left: 1.25rem;
  margin: 0;
}

.tradeoff-col li { font-size: 0.9rem; margin-bottom: 0.35rem; }
.tradeoff-col.pro li::marker { color: var(--accent); }
.tradeoff-col.con li::marker { color: #FF6B6B; }

/* ── Architecture image ────────────────────────────────── */
.arch-image {
  margin: 1.75rem 0;
  border: 1px solid var(--border);
  border-radius: 2px;
  overflow: hidden;
  background: var(--bg-card);
}

.arch-image img {
  width: 100%;
  height: auto;
  display: block;
}

.arch-image:not(:has(img[src])) { display: none; }

/* Hide broken/missing images gracefully */
.arch-image img[src=""] { display: none; }

.arch-caption {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* ── Footer ────────────────────────────────────────────── */
.page-footer {
  border-top: 1px solid var(--border);
  padding: 2rem var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
}

.footer-back {
  color: var(--ink-muted);
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.footer-back:hover { color: var(--accent); }

/* ── Responsive ────────────────────────────────────────── */
@media (max-width: 600px) {
  .tradeoff-grid { grid-template-columns: 1fr; }
  .project-meta  { gap: 1.25rem; }
}