/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #fafafa;
  --bg-card: #ffffff;
  --text: #1a1a1a;
  --text-muted: #555;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e2e2e2;
  --border-light: #f0f0f0;
  --code-bg: #f4f4f5;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --max-width: 960px;
}

html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* === Nav === */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.nav-brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}
.nav-links { display: flex; gap: 1.5rem; }
.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--accent); }

/* === Main content === */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* === Typography === */
h1 {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}
h2 {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  margin-top: 3rem;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}
h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}
p { margin-bottom: 1rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

strong { font-weight: 600; }

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}
li { margin-bottom: 0.35rem; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

/* === Hero / Landing === */
.hero {
  padding: 3rem 0 2rem;
}
.hero .subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 1.5rem;
}
.hero .bio {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.8;
}
.bio-list {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.8;
  margin-top: 0.5rem;
  margin-bottom: 1.5rem;
}
.hero .contact-row {
  margin-top: 1.25rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.hero .contact-row a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent);
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--accent);
  border-radius: 6px;
  transition: all 0.15s;
}
.hero .contact-row a:hover {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}

/* === Project Cards === */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 1.5rem;
}
@media (max-width: 640px) {
  .project-grid { grid-template-columns: 1fr; }
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-decoration: none;
  color: var(--text);
  transition: all 0.2s;
  display: block;
}
.project-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  transform: translateY(-2px);
}
.project-card h3 {
  font-size: 1.1rem;
  margin: 0 0 0.5rem 0;
  color: var(--text);
}
.project-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}
.project-card .card-arrow {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
}

/* === Hero image === */
.hero-image {
  margin: 2rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.hero-image img {
  width: 100%;
  display: block;
}

/* === Project Pages === */
.back-link {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  text-decoration: none;
}
.back-link:hover { color: var(--accent); text-decoration: none; }

.project-header {
  margin-bottom: 2rem;
}
.project-header h1 {
  margin-bottom: 0.75rem;
}
.project-header .lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* === Media containers === */
.media-block {
  margin: 1.5rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #000;
}
/* Full-width solo blocks — photos use cover, technical images contain */
.media-block > img {
  width: 100%;
  display: block;
}
.media-block > video {
  width: 100%;
  display: block;
  max-height: 500px;
  object-fit: contain;
  background: #000;
}
/* Hero photo: crop is fine, keep aspect ratio sensible */
.hero-image .media-block > img,
.media-block.photo > img {
  max-height: 540px;
  object-fit: cover;
  object-position: center top;
}
/* light-bg blocks are technical (charts, CAD, renders) — always contain, no crop */
.media-block.light-bg > img {
  object-fit: contain;
  max-height: none;
  background: var(--bg-card);
}
.media-block.light-bg {
  background: var(--bg-card);
}
.media-caption {
  padding: 0.6rem 1rem;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* === Image grids (2-up) === */
.image-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
  align-items: stretch;
}
.image-row .media-block,
.video-grid .media-block {
  margin: 0;
  display: flex;
  flex-direction: column;
}
/* Media fills the full cell so both boxes match height */
.image-row .media-block > img {
  flex: 1;
  min-height: 0;
  width: 100%;
  display: block;
  height: 300px;
  object-fit: contain;
  object-position: center;
}
/* Portrait photos: cover-crop is fine */
.image-row .media-block.photo > img {
  object-fit: cover;
  object-position: center top;
}
.image-row .media-block > video,
.video-grid .media-block > video {
  width: 100%;
  display: block;
  height: 260px;
  object-fit: contain;
}
@media (max-width: 640px) {
  .image-row { grid-template-columns: 1fr; }
}

/* === Video grids (2-up) === */
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
  align-items: stretch;
}
@media (max-width: 640px) {
  .video-grid { grid-template-columns: 1fr; }
}

/* === 3-column model comparison === */
.model-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.5rem 0;
}
@media (max-width: 768px) {
  .model-grid { grid-template-columns: 1fr; }
}
.model-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0.5rem 0.75rem 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
}
.model-label.baseline { color: #64748b; }
.model-label.phase2   { color: #0891b2; }
.model-label.visual   { color: #7c3aed; }

/* === Hero split (landing page) === */
.hero-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
  align-items: start;
}
@media (max-width: 640px) {
  .hero-split { grid-template-columns: 1fr; }
}
.hero-split .media-block { margin: 0; }
.hero-split .media-block > img {
  max-height: 420px;
  width: 100%;
  display: block;
  object-fit: contain;
  background: var(--bg-card);
}
.hero-split .media-block > video {
  max-height: 420px;
  width: 100%;
  display: block;
  object-fit: contain;
  background: #000;
}

/* === Section styling === */
.section-block {
  margin-top: 2.5rem;
}
.section-block h2 {
  margin-top: 0;
}

/* === Spec list === */
.spec-list {
  list-style: none;
  padding: 0;
}
.spec-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.95rem;
}
.spec-list li:last-child { border-bottom: none; }
.spec-list strong {
  display: inline;
  color: var(--text);
}

/* === Comparison table === */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.9rem;
}
th {
  text-align: left;
  font-weight: 600;
  padding: 0.6rem 0.75rem;
  border-bottom: 2px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-light);
}

/* === Callout / lessons === */
.lesson {
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  background: #f8faff;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.lesson p { margin: 0; font-size: 0.95rem; }
.lesson strong { color: var(--text); }

/* === Footer === */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  text-align: center;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.site-footer p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

/* === Responsive === */
@media (max-width: 640px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.25rem; }
  main { padding: 1.5rem 1rem 3rem; }
  .nav-inner { padding: 0.6rem 1rem; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.85rem; }
}