:root {
  --bg: #050608;
  --bg-elevated: #0c0f16;
  --bg-alt: #0b0e14;
  --border-subtle: rgba(255, 255, 255, 0.06);
  --text: #f5f5f7;
  --text-muted: #a0a4b5;
  --accent: #3fa9ff;
  --accent-soft: rgba(63, 169, 255, 0.12);
  --accent-strong: rgba(63, 169, 255, 0.25);
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.65);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --max-width: 1040px;
}

/* Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.6;
}

/* Layout helpers */
.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.section {
  padding-block: var(--space-16);
}

.section-alt {
  background: radial-gradient(
      circle at top left,
      rgba(63, 169, 255, 0.06),
      transparent
    ),
    radial-gradient(
      circle at bottom right,
      rgba(158, 100, 255, 0.05),
      transparent
    );
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(5, 6, 8, 0.92);
  border-bottom: 1px solid var(--border-subtle);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  letter-spacing: 0.03em;
}

.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #9e64ff);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  box-shadow: 0 0 0 1px rgba(5, 6, 8, 0.9), 0 12px 30px rgba(0, 0, 0, 0.7);
}

.logo-text {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: 0.9rem;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  padding-block: var(--space-1);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

/* Hero */
.hero {
  padding-block: var(--space-20);
  background: radial-gradient(
      circle at top left,
      rgba(63, 169, 255, 0.18),
      transparent 60%
    ),
    radial-gradient(
      circle at bottom right,
      rgba(158, 100, 255, 0.16),
      transparent 55%
    );
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2.5fr);
  gap: var(--space-10);
  align-items: center;
}

.hero-kicker {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

.hero h1 {
  font-size: clamp(2.1rem, 4vw, 2.6rem);
  line-height: 1.18;
  margin: 0 0 var(--space-3);
}

.hero-summary {
  margin: 0 0 var(--space-5);
  color: var(--text-muted);
  max-width: 40rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.3rem;
  font-size: 0.9rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 140ms ease, color 140ms ease,
    border-color 140ms ease, box-shadow 140ms ease, transform 80ms ease;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), #9e64ff);
  color: #050608;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.7);
}

.btn.primary:hover,
.btn.primary:focus-visible {
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.9);
  transform: translateY(-1px);
}

.btn.ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent-strong);
}

.btn.ghost:hover,
.btn.ghost:focus-visible {
  background: var(--accent-soft);
}

/* Hero aside card */
.hero-aside {
  display: flex;
  justify-content: flex-end;
}

.hero-card {
  background: rgba(11, 14, 20, 0.95);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
}

.hero-card h2 {
  font-size: 1rem;
  margin-top: 0;
  margin-bottom: var(--space-3);
}

.hero-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.hero-card li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-block: 3px;
}

/* Sections */
.section h2 {
  font-size: 1.4rem;
  margin-top: 0;
  margin-bottom: var(--space-4);
}

.section p {
  margin-top: 0;
  color: var(--text-muted);
  max-width: 44rem;
}

/* Grids */
.grid {
  display: grid;
  gap: var(--space-6);
}

.two-columns {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.three-columns {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid h3 {
  font-size: 1rem;
  margin-top: 0;
  margin-bottom: var(--space-3);
}

.grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.grid li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-block: 3px;
}

/* Projects */
.project-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.7);
}

.card h3 {
  font-size: 1.05rem;
  margin-top: 0;
  margin-bottom: var(--space-2);
}

.card .meta {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.highlights {
  list-style: none;
  padding: 0;
  margin: 0;
}

.highlights li {
  position: relative;
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-left: 1.1rem;
  margin-bottom: 0.25rem;
}

.highlights li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
}

/* Contact */
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding-block: var(--space-4);
  margin-top: var(--space-8);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-layout {
  display: flex;
  justify-content: center;
}

/* Responsive */
@media (max-width: 900px) {
  .hero-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-aside {
    justify-content: flex-start;
  }

  .project-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .two-columns {
    grid-template-columns: minmax(0, 1fr);
  }

  .three-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .nav-links {
    flex-wrap: wrap;
    gap: var(--space-3);
  }

  .section {
    padding-block: var(--space-12);
  }

  .three-columns {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding-block: var(--space-16);
  }
}