:root {
  --bg: #0d0e10;
  --bg-elev: #15171a;
  --bg-elev-2: #1c1f23;
  --border: #26292f;
  --text: #e6e7ea;
  --text-dim: #9aa0a6;
  --text-mute: #6b7079;
  --accent: #c8ccd1;
  --accent-strong: #e6e8eb;
  --accent-dim: #8a8f96;
  --danger: #f87171;
  --radius: 10px;
  --radius-lg: 16px;
  --maxw: 1100px;
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset,
            0 10px 30px rgba(0, 0, 0, 0.35);
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-display: "Space Grotesk", var(--font-sans);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--accent-strong); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
  color: var(--text);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); line-height: 1.1; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.25rem); line-height: 1.2; }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1em; color: var(--text-dim); }

::selection { background: var(--accent); color: var(--bg); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 14, 16, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.brand .glyph {
  width: 18px;
  height: 18px;
  color: var(--accent);
  transition: color 0.2s ease, transform 0.2s ease;
}
.brand:hover { color: var(--accent-strong); }
.brand:hover .glyph { color: var(--accent-strong); transform: rotate(-8deg); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 8px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  position: relative;
  transition: transform 0.2s ease;
}
.nav-toggle span::before,
.nav-toggle span::after { content: ""; position: absolute; left: 0; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after  { top: 6px; }

.site-nav ul {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  color: var(--text-dim);
  font-size: 0.95rem;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
  }
  .site-nav.is-open { display: block; }
  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.5rem 1rem;
  }
  .site-nav li { border-bottom: 1px solid var(--border); }
  .site-nav li:last-child { border-bottom: none; }
  .site-nav a { display: block; padding: 0.85rem 0; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(4rem, 10vw, 7rem) 0 clamp(3rem, 8vw, 6rem);
  overflow: hidden;
  background:
    radial-gradient(1000px 400px at 80% -10%, rgba(200, 204, 209, 0.08), transparent 60%),
    radial-gradient(800px 400px at 0% 100%, rgba(200, 204, 209, 0.05), transparent 60%);
}
/* Subtle 8x8 chessboard pattern, fading out */
.hero::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 520px;
  height: 520px;
  background-image:
    linear-gradient(45deg, rgba(200, 204, 209, 0.11) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(200, 204, 209, 0.11) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(200, 204, 209, 0.11) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(200, 204, 209, 0.11) 75%);
  background-size: 56px 56px;
  background-position: 0 0, 0 28px, 28px -28px, -28px 0;
  -webkit-mask-image: radial-gradient(ellipse at top right, #000 0%, transparent 65%);
          mask-image: radial-gradient(ellipse at top right, #000 0%, transparent 65%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin-bottom: 1rem;
}
.hero .eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 1px;
  transform: rotate(45deg);
  display: inline-block;
}
.hero h1 .accent { color: var(--accent); }
.hero p.lede {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-dim);
  max-width: 38rem;
}

.cta-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.25rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}
.btn:hover {
  background: var(--bg-elev-2);
  border-color: var(--accent-dim);
  color: var(--text);
}
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.btn.primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: var(--bg);
}

/* ---------- Sections ---------- */
.section {
  position: relative;
  padding: clamp(3rem, 7vw, 5rem) 0;
  border-top: 1px solid var(--border);
}
/* Tiny chess-piece notch sitting on the section's top border */
.section::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 50%;
}
.section::after {
  content: "♞";
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 12px;
  line-height: 1;
  color: var(--accent-dim);
  pointer-events: none;
}
.section.section--alt::after { content: "♜"; }
.section.section--mail::after { content: "♛"; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1rem;
  flex-wrap: wrap;
}
.section-head h2 { margin: 0; }
.section-head .link-arrow {
  font-size: 0.95rem;
  color: var(--text-dim);
}
.section-head .link-arrow:hover { color: var(--accent); }

/* ---------- Project grid ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease,
              box-shadow 0.2s ease;
  color: inherit;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-dim);
  box-shadow: var(--shadow);
}
.card .thumb {
  aspect-ratio: 16 / 10;
  background: var(--bg-elev-2);
  overflow: hidden;
}
.card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.card:hover .thumb img { transform: scale(1.03); }
.card-body {
  padding: 1.1rem 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: auto;
  padding-top: 0.5rem;
}
.tag {
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-mute);
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
}
.card h3 { margin: 0; color: var(--text); }
.card p { margin: 0; color: var(--text-dim); font-size: 0.95rem; }

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}
.tag-row .tag { font-size: 0.78rem; }

/* ---------- Contact form ---------- */
.contact {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2.5rem);
}
.contact .form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.contact .full { grid-column: 1 / -1; }
.contact label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}
.contact input,
.contact textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
  color: var(--text);
  font: inherit;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.contact input:focus,
.contact textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--bg-elev-2);
}
.contact textarea { resize: vertical; min-height: 140px; }

@media (max-width: 600px) {
  .contact .form-grid { grid-template-columns: 1fr; }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 3rem;
  color: var(--text-mute);
  font-size: 0.9rem;
}
.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-footer .icons {
  display: flex;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-footer .icons a {
  color: var(--text-dim);
  display: inline-flex;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  align-items: center;
  justify-content: center;
}
.site-footer .icons a:hover {
  color: var(--text);
  border-color: var(--accent-dim);
}
.site-footer .icons svg { width: 18px; height: 18px; }

/* ---------- Case study page ---------- */
.case-hero {
  padding: clamp(3rem, 7vw, 5rem) 0 1.5rem;
}
.case-hero .back {
  font-size: 0.9rem;
  color: var(--text-dim);
  display: inline-block;
  margin-bottom: 1rem;
}
.case-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin: 2rem 0;
}
.case-meta dt {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 0.25rem;
}
.case-meta dd {
  margin: 0;
  color: var(--text);
  font-size: 0.95rem;
}
.case-body h3 { margin-top: 2rem; }
.case-body ul { color: var(--text-dim); padding-left: 1.2rem; }
.case-body li { margin-bottom: 0.4rem; }

.case-shot {
  margin: 2rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-elev);
}

/* Reveal-on-scroll */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}