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

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-raised: #1c2333;
  --border: #262e3a;
  --border-hover: #354050;
  --text: #d0d7e0;
  --text-bright: #ecf0f5;
  --text-muted: #7d8a98;
  --text-dim: #4e5c6a;

  /* Cyan — three intensities */
  --cyan-muted: #4a8090;
  --cyan-mid: #5ea0b0;
  --cyan: #00d4e0;
  --cyan-dim: rgba(0, 212, 224, 0.1);
  --cyan-glow: rgba(0, 212, 224, 0.2);

  /* Amber — three intensities */
  --amber-muted: #8a7540;
  --amber-mid: #a89050;
  --amber: #f0a020;
  --amber-dim: rgba(240, 160, 32, 0.1);

  /* Status */
  --green: #3dd68c;
  --green-dim: rgba(61, 214, 140, 0.1);

  --font-display: 'Instrument Serif', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
  --font-body: 'Outfit', -apple-system, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-weight: 400;
  overflow-x: hidden;
}

/* Grain overlay */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.02;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 180px;
}

/* ── Nav ── */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 2.5rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: color 0.4s;
}

.logo:hover {
  color: var(--text-bright);
}

.logo-mark {
  color: var(--cyan-muted);
  margin-right: 0.05rem;
  transition: color 0.4s;
}

.logo:hover .logo-mark {
  color: var(--cyan);
}

.logo-warm {
  color: var(--amber-muted);
  transition: color 0.4s;
}

.logo:hover .logo-warm {
  color: var(--amber);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
}

.nav-links a {
  font-family: var(--font-mono);
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: color 0.3s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--cyan-muted);
  transition: width 0.3s, background 0.3s;
}

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

.nav-links a:hover::after {
  width: 100%;
  background: var(--cyan-mid);
}

/* ── Sections ── */
main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2.5rem;
  width: 100%;
}

/* Section headers */
.section-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--cyan-muted);
  letter-spacing: 0.1em;
}

section h2 {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

/* ── Hero ── */
.hero {
  padding: 8rem 0 6rem;
  position: relative;
}

.hero-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--cyan-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, 6.5rem);
  font-weight: 400;
  line-height: 1.05;
  color: var(--text-bright);
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 520px;
  font-weight: 300;
  line-height: 1.7;
}

.hero-line {
  width: 120px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan-muted), var(--amber-muted), transparent);
  margin-top: 2.5rem;
  animation: hero-line-breathe 4s ease-in-out infinite;
}

@keyframes hero-line-breathe {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* Hero staggered entrance */
.hero-stagger {
  opacity: 0;
  transform: translateY(12px);
  animation: hero-enter 0.8s ease forwards;
}

.hero-stagger:nth-child(1) { animation-delay: 0.1s; }
.hero-stagger:nth-child(2) { animation-delay: 0.25s; }
.hero-stagger:nth-child(3) { animation-delay: 0.4s; }
.hero-stagger:nth-child(4) { animation-delay: 0.55s; }

@keyframes hero-enter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Project grid ── */
.projects {
  padding: 4rem 0;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.project-card--featured {
  grid-column: 1 / -1;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2rem;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.4s, box-shadow 0.4s, transform 0.4s;
  position: relative;
  overflow: hidden;
  min-height: 200px;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan-muted), var(--amber-muted), transparent);
  opacity: 0;
  transition: opacity 0.4s;
}

.project-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 8px 40px -10px rgba(0, 0, 0, 0.4);
  transform: translateY(-3px);
}

.project-card:hover::before {
  opacity: 1;
}

/* Featured card gets extra presence */
.project-card--featured {
  padding: 2.5rem;
}

.project-card--featured h3 {
  font-size: 1.75rem;
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.card-status {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--green);
  background: var(--green-dim);
  padding: 0.2rem 0.55rem;
  border-radius: 2px;
}

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.tag-cyan {
  color: var(--cyan-muted);
}

.tag-amber {
  color: var(--amber-muted);
}

.project-card h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--text-bright);
  margin-bottom: 0.75rem;
  line-height: 1.25;
  transition: color 0.3s;
}

.project-card:hover h3 {
  color: #fff;
}

.project-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.65;
  flex: 1;
  font-weight: 300;
}

.card-footer {
  margin-top: 1.5rem;
  display: flex;
  justify-content: flex-end;
}

.card-arrow {
  font-size: 1.1rem;
  color: var(--text-dim);
  transition: color 0.3s, transform 0.3s;
}

.project-card:hover .card-arrow {
  color: var(--cyan-mid);
  transform: translateX(3px);
}

/* ── About ── */
.about {
  padding: 6rem 0 4rem;
}

.about-content {
  display: flex;
  gap: 2rem;
  align-items: stretch;
}

.about-accent {
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-muted), var(--amber-muted));
  border-radius: 1px;
  flex-shrink: 0;
}

.about-text p {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
  font-weight: 300;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.about-text p:last-child {
  margin-bottom: 0;
  color: var(--text);
  font-weight: 400;
}

/* ── Footer ── */
footer {
  padding: 3rem 2.5rem;
  border-top: 1px solid var(--border);
  margin-top: 4rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-dim);
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

.footer-logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.footer-logo .logo-mark {
  color: var(--cyan-muted);
}

.footer-logo .logo-warm {
  color: var(--amber-muted);
}

/* ── Animations ── */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Mobile ── */
@media (max-width: 640px) {
  nav {
    padding: 1.5rem;
    flex-direction: column;
    gap: 1.25rem;
    align-items: flex-start;
  }

  main {
    padding: 0 1.5rem;
  }

  .hero {
    padding: 5rem 0 3rem;
  }

  .hero h1 {
    font-size: 2.8rem;
  }

  .project-grid {
    grid-template-columns: 1fr;
  }

  .about-content {
    gap: 1.25rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.75rem;
    align-items: flex-start;
  }
}