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

:root {
  --bg: #ffffff;
  --bg-alt: #f7f7f7;
  --surface: #f0f0f0;
  --placeholder: #d8d8d8;
  --border: #e6e6e6;
  --text: #111111;
  --muted: #737373;
  --accent: #00a068;
  --radius: 8px;
  --nav-h: 54px;
  --max-w: 960px;
  --pad-x: clamp(1.25rem, 5vw, 2.5rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0d0d;
    --bg-alt: #141414;
    --surface: #1c1c1c;
    --placeholder: #2a2a2a;
    --border: #252525;
    --text: #ebebeb;
    --muted: #808080;
  }
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ── Nav ───────────────────────────────────────────── */

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--pad-x);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.05em;
  color: var(--text);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.75rem;
}

.nav-links a {
  font-size: 0.8125rem;
  color: var(--muted);
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--text);
}

@media (max-width: 480px) {
  .nav-links {
    gap: 1rem;
  }
  .nav-links a {
    font-size: 0.75rem;
  }
}

/* ── Hero ──────────────────────────────────────────── */

#hero {
  padding: clamp(4.5rem, 12vw, 8rem) var(--pad-x) clamp(3rem, 8vw, 5rem);
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

#hero h1 {
  font-size: clamp(2.25rem, 6vw, 3.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: 1rem;
}

.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.125rem);
  color: var(--muted);
  max-width: 480px;
  margin-bottom: 2rem;
  line-height: 1.55;
}

.hero-links {
  display: flex;
  gap: 0.625rem;
  flex-wrap: wrap;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--bg);
  transition:
    border-color 0.15s,
    color 0.15s;
}

.hero-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Sections ──────────────────────────────────────── */

section {
  padding: clamp(2.5rem, 7vw, 4.5rem) var(--pad-x);
}

#client-work {
  background: var(--bg-alt);
}
#research {
  background: var(--bg-alt);
}

.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

/* ── Project Grid ──────────────────────────────────── */

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.project-grid--slim {
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
}

/* ── Project Card ──────────────────────────────────── */

.project-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
  transition:
    box-shadow 0.18s,
    transform 0.18s;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.07);
  transform: translateY(-2px);
}

@media (prefers-color-scheme: dark) {
  .project-card:hover {
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
  }
}

.card-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

.card-image--text {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.card-image--icon {
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-image picture {
  display: contents;
}

.card-image--icon img {
  object-fit: contain;
  object-position: center center;
  padding: 1.5rem;
}

.placeholder {
  background: var(--placeholder);
}

@media (min-width: 580px) {
  .project-card--featured {
    grid-column: span 2;
  }
  .project-card--featured .card-image {
    aspect-ratio: 21 / 9;
  }
}

.card-body {
  padding: 1rem 1.125rem 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.card-tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15em 0.45em;
}

.card-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  border-radius: 4px;
  padding: 0.15em 0.5em;
}

.card-badge--progress {
  background: #fef3c7;
  color: #92400e;
}

@media (prefers-color-scheme: dark) {
  .card-badge--progress {
    background: #3b1f00;
    color: #fcd34d;
  }
}

.card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.375rem;
}

.card-desc {
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.55;
  margin-bottom: 0.875rem;
  flex: 1;
}

.card-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.card-link {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  transition: opacity 0.15s;
}

.card-link--muted {
  color: var(--muted);
}

.card-link:hover {
  opacity: 0.7;
}

/* ── School section ────────────────────────────────── */

#school .project-card {
  opacity: 0.8;
}

#school .project-card:hover {
  opacity: 1;
}

/* ── Research ──────────────────────────────────────── */

.pub {
  max-width: 620px;
  padding-left: 1.125rem;
  border-left: 2px solid var(--border);
}

.pub-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.pub-authors {
  font-size: 0.8125rem;
  color: var(--muted);
  margin-bottom: 0.2rem;
}

.pub-venue {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.875rem;
}

/* ── Project Sub-pages ─────────────────────────────── */

.project-hero {
  padding-bottom: clamp(2rem, 5vw, 3rem);
}

.project-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}

.prose section {
  background: none;
  padding: 0;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 2rem 2.5rem;
  margin-bottom: 2.5rem;
}

.detail-block h2 {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  margin-bottom: 0.625rem;
}

.detail-block p,
.detail-block li {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.65;
}

.detail-block p + p {
  margin-top: 0.5rem;
}

.detail-block ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.detail-block li::before {
  content: "— ";
  color: var(--muted);
}

.placeholder-screenshots {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.screenshot-placeholder {
  aspect-ratio: 9 / 16;
  border-radius: var(--radius);
}

/* ── Footer ────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--border);
  padding: 1.75rem var(--pad-x);
  background: var(--bg);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.8125rem;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer-links a {
  color: var(--muted);
  transition: color 0.15s;
}

.footer-links a:hover {
  color: var(--text);
}