:root {
  color-scheme: light dark;
  --font-sans: "Plus Jakarta Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: clamp(3rem, 8vw, 5.5rem);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 12px 40px -12px rgba(0, 0, 0, 0.12);

  --bg: #fafafa;
  --bg-elevated: #ffffff;
  --text: #0a0a0b;
  --text-muted: #52525b;
  --border: rgba(10, 10, 11, 0.08);
  --accent: #2563eb;
  --accent-2: #7c3aed;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --hero-gradient: linear-gradient(135deg, #1d4ed8 0%, #7c3aed 55%, #a21caf 100%);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #09090b;
  --bg-elevated: #121214;
  --text: #fafafa;
  --text-muted: #a1a1aa;
  --border: rgba(250, 250, 250, 0.08);
  --accent: #60a5fa;
  --accent-2: #a78bfa;
  --accent-soft: rgba(96, 165, 250, 0.15);
  --hero-gradient: linear-gradient(135deg, #60a5fa 0%, #a78bfa 50%, #e879f9 100%);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 20px 50px -20px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.bg-grid {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 20%, transparent 70%);
  opacity: 0.45;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-sm);
  z-index: 100;
  transition: top 0.2s var(--ease-out);
}

.skip-link:focus {
  top: var(--space-md);
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

.container {
  width: min(1120px, 100% - 2 * var(--space-xl));
  margin-inline: auto;
}

.container.narrow {
  width: min(640px, 100% - 2 * var(--space-xl));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  min-height: 4rem;
}

.nav {
  margin-left: auto;
}

.logo {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease-out);
}

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

.lang-link {
  flex-shrink: 0;
  height: 2.5rem;
  padding: 0 0.85rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  box-shadow: var(--shadow-sm);
  transition:
    border-color 0.2s var(--ease-out),
    transform 0.15s var(--ease-out);
}

.lang-link:hover {
  border-color: color-mix(in srgb, var(--text-muted) 35%, transparent);
  transform: translateY(-1px);
}

.lang-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle {
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition:
    border-color 0.2s var(--ease-out),
    transform 0.15s var(--ease-out);
}

.theme-toggle:hover {
  border-color: color-mix(in srgb, var(--text-muted) 35%, transparent);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle__icon {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px var(--text-muted);
}

[data-theme="dark"] .theme-toggle__icon {
  box-shadow:
    inset 0 0 0 2px var(--text-muted),
    -6px 0 0 -3px var(--text-muted);
}

.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
}

.hero-inner {
  display: grid;
  gap: var(--space-lg);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 var(--space-md);
}

.hero-title {
  font-size: clamp(2.25rem, 5.5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 var(--space-lg);
}

.hero-title__accent {
  background: var(--hero-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  max-width: 36rem;
  color: var(--text-muted);
  margin: 0;
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 2.75rem;
  padding: 0 1.05rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 1px solid transparent;
  transition:
    background 0.2s var(--ease-out),
    color 0.2s var(--ease-out),
    border-color 0.2s var(--ease-out),
    transform 0.15s var(--ease-out);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  box-shadow: 0 10px 30px -18px color-mix(in srgb, var(--accent) 60%, transparent);
}

.btn--primary:hover {
  transform: translateY(-1px);
}

.btn--ghost {
  background: var(--bg-elevated);
  color: var(--text);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.btn--ghost:hover {
  border-color: color-mix(in srgb, var(--text-muted) 40%, transparent);
  transform: translateY(-1px);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin: 0;
  padding: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--bg-elevated) 70%, var(--bg));
  max-width: 28rem;
}

.metrics__item {
  margin: 0;
}

.metrics dt {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 0 0 var(--space-xs);
}

.metrics dd {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.metrics__suffix {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 0.35rem;
}

.metrics__value {
  font-variant-numeric: tabular-nums;
}

.section {
  padding: var(--space-2xl) 0;
}

.section--alt {
  background: color-mix(in srgb, var(--bg-elevated) 70%, var(--bg));
  border-block: 1px solid var(--border);
}

.section--cta {
  padding-bottom: var(--space-3xl);
}

.section-title {
  font-size: clamp(1.35rem, 2.5vw, 1.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-md);
}

.section-desc {
  color: var(--text-muted);
  margin: 0 0 var(--space-xl);
  max-width: 40rem;
}

.prose {
  color: var(--text-muted);
  margin: 0;
}

.card-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}

.card {
  height: 100%;
  padding: var(--space-xl);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition:
    border-color 0.25s var(--ease-out),
    box-shadow 0.25s var(--ease-out),
    transform 0.25s var(--ease-out);
}

.card:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 var(--space-xs);
  letter-spacing: -0.02em;
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  margin: 0 0 var(--space-md);
}

.card__text {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0 0 var(--space-lg);
  line-height: 1.6;
}

.card__links {
  display: flex;
  gap: var(--space-md);
}

.card__links a {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  padding-bottom: 2px;
  transition: border-color 0.2s var(--ease-out);
}

.card__links a:hover {
  border-color: var(--accent);
}

.stack-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.stack-list li {
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--text);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
}

.contact-list {
  list-style: none;
  margin: var(--space-lg) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.contact-list a {
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}

.contact-list a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.contact-link--empty {
  color: var(--text-muted);
  text-decoration: none;
  cursor: default;
}

.contact-link--empty:hover {
  text-decoration: none;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-xl) 0;
}

.footer-inner p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-url {
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

@media (max-width: 640px) {
  .metrics {
    grid-template-columns: 1fr;
    max-width: none;
  }

  .header-inner {
    flex-wrap: wrap;
    row-gap: var(--space-sm);
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: var(--space-md);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border);
  }

  .nav a {
    font-size: 0.85rem;
  }
}