:root {
  --bg: #07111f;
  --bg-alt: #0f172a;
  --surface: #111c32;
  --surface-strong: #16243f;
  --text: #f8fafc;
  --muted: #94a3b8;
  --accent: #4cc9f0;
  --accent-2: #7c3aed;
  --accent-3: #22c55e;
  --border: rgba(148, 163, 184, 0.2);
  --shadow: 0 18px 40px rgba(2, 8, 23, 0.35);
  --radius: 1rem;
  --radius-sm: 0.75rem;
  --max-width: 1200px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: linear-gradient(135deg, var(--bg) 0%, #0c1327 100%);
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #02111f;
  padding: 0.75rem 1rem;
  z-index: 999;
}
.skip-link:focus { left: 1rem; top: 1rem; }

.container {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(7, 17, 31, 0.85);
  border-bottom: 1px solid var(--border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.brand-badge {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 0.8rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid;
  place-items: center;
  color: white;
  font-weight: 800;
}
.site-nav ul {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  color: var(--muted);
  transition: color 180ms ease;
}
.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a.active {
  color: var(--text);
}
.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 0.25rem;
}

.hero {
  padding: 5rem 0 4rem;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}
.eyebrow {
  display: inline-block;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.8rem;
  margin-bottom: 0.8rem;
}
h1, h2, h3 {
  line-height: 1.2;
  margin: 0 0 1rem;
}
h1 { font-size: clamp(2.2rem, 4.5vw, 4rem); }
h2 { font-size: clamp(1.7rem, 2.6vw, 2.2rem); }
.lead { font-size: 1.06rem; color: var(--muted); max-width: 60ch; }
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}
.btn:hover,
.btn:focus-visible { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  box-shadow: var(--shadow);
}
.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.hero-card,
.card,
.panel,
.info-card,
.timeline-item,
.project-card,
.contact-card {
  background: rgba(17, 28, 50, 0.95);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-card { padding: 1.5rem; }
.hero-card ul { padding-left: 1.1rem; color: var(--muted); }
.hero-card li + li { margin-top: 0.6rem; }

.section {
  padding: 2.5rem 0;
}
.section-title {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.section-title p { color: var(--muted); margin: 0; }
.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 1.25rem;
}
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card,
.panel,
.info-card,
.timeline-item,
.project-card,
.contact-card { padding: 1.25rem; }
.project-card { display: flex; flex-direction: column; gap: 1rem; }
.project-card img { border-radius: 0.9rem; border: 1px solid var(--border); }
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tag {
  display: inline-flex;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: rgba(76, 201, 240, 0.12);
  color: var(--accent);
  border: 1px solid rgba(76, 201, 240, 0.24);
  font-size: 0.8rem;
}
.metric-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.metric { padding: 1rem; border-radius: 1rem; background: rgba(255,255,255,0.04); border: 1px solid var(--border); }
.metric strong { display: block; font-size: 1.4rem; margin-bottom: 0.25rem; }

.timeline {
  display: grid;
  gap: 1rem;
}
.timeline-item { border-left: 3px solid var(--accent); }
.timeline-item h3 { margin-bottom: 0.25rem; }
.timeline-item p { margin: 0; color: var(--muted); }

.list-stack { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.list-stack span { padding: 0.55rem 0.75rem; border-radius: 999px; background: rgba(255,255,255,0.05); border: 1px solid var(--border); }

.quote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  color: var(--muted);
  font-style: italic;
}

.case-study-hero {
  padding: 3rem 0 1.5rem;
}
.case-study-hero .container { display: grid; gap: 1rem; }
.case-study-header {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}
.case-study-content {
  display: grid;
  gap: 1.25rem;
}
.case-study-content section {
  background: rgba(17, 28, 50, 0.86);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.case-study-content h2 { font-size: 1.25rem; margin-bottom: 0.7rem; }
.case-study-content p, .case-study-content li { color: var(--muted); }
.case-study-content ul { margin: 0; padding-left: 1.2rem; }

.contact-form {
  display: grid;
  gap: 1rem;
}
label { font-weight: 600; }
input, textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  border-radius: 0.8rem;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--text);
}
textarea { min-height: 8rem; resize: vertical; }

.site-footer {
  padding: 2rem 0 3rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}
.site-footer .container { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 920px) {
  .hero-grid { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 1rem;
    right: 1rem;
    display: none;
    background: rgba(7, 17, 31, 0.98);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 1rem;
  }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; align-items: start; gap: 0.85rem; }
  .grid-2, .grid-3, .grid-4, .metric-list { grid-template-columns: 1fr; }
  .section-title { flex-direction: column; align-items: start; }
  .hero { padding-top: 3rem; }
}