:root {
  /* Primary */
  --primary: #818cf8;
  --primary-fg: #000000;

  /* Secondary */
  --secondary: #2dd4bf;
  --secondary-fg: #000000;

  /* Accent */
  --accent: #fcd34d;
  --accent-fg: #000000;

  /* Base */
  --bg: #000000;
  --foreground: #ffffff;

  /* Card */
  --card: #1a212b;
  --card-fg: #ffffff;

  /* Popover */
  --popover: #1a212b;
  --popover-fg: #ffffff;

  /* Muted */
  --muted: #333333;
  --muted-fg: #cccccc;

  /* Destructive */
  --destructive: #f87171;
  --destructive-fg: #000000;

  /* Border & Input */
  --border: #545454;
  --input: #ffffff;
  --ring: #818cf8;

  /* Charts */
  --chart-1: #818cf8;
  --chart-2: #2dd4bf;
  --chart-3: #fcd34d;
  --chart-4: #f472b6;
  --chart-5: #4ade80;

  /* Sidebar (sync) */
  --sidebar: #000000;
  --sidebar-fg: #ffffff;
  --sidebar-primary: #818cf8;
  --sidebar-primary-fg: #000000;
  --sidebar-accent: #fcd34d;
  --sidebar-accent-fg: #000000;
  --sidebar-border: #ffffff;
  --sidebar-ring: #818cf8;

  /* Derived */
  --text: var(--foreground);
  --text-muted: var(--muted-fg);
  --surface: var(--card);
  --surface-muted: var(--muted);
  --shadow-soft: 0 16px 48px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 60px rgba(129, 140, 248, 0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --nav-height: 72px;
  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Space Mono', ui-monospace, 'Cascadia Code', monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(129, 140, 248, 0.14), transparent),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(45, 212, 191, 0.06), transparent),
    var(--bg);
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 160ms ease, opacity 160ms ease;
}

a:hover {
  color: var(--secondary);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

.container {
  width: min(1140px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.page-transition {
  animation: fade-page 480ms ease;
}

@keyframes fade-page {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 1000;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  color: var(--foreground);
}

/* ── Header ── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
}

.navbar {
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--foreground);
  letter-spacing: -0.02em;
}

.brand:hover {
  color: var(--primary);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted-fg);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: color 160ms ease, background-color 160ms ease;
}

.nav-link:hover,
.nav-link[aria-current='page'] {
  color: var(--foreground);
  background: var(--muted);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  color: var(--foreground);
  min-width: 40px;
  min-height: 40px;
  cursor: pointer;
  font-size: 1.1rem;
}

/* ── Buttons ── */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.72rem 1.25rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--foreground);
  background: var(--card);
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease,
    background-color 160ms ease, color 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
  text-decoration: none;
  border-color: var(--primary);
  color: var(--foreground);
}

.button-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-fg);
}

.button-primary:hover {
  background: color-mix(in srgb, var(--primary) 88%, white);
  border-color: color-mix(in srgb, var(--primary) 88%, white);
  color: var(--primary-fg);
}

.button-secondary {
  background: var(--secondary);
  border-color: var(--secondary);
  color: var(--secondary-fg);
}

.button-secondary:hover {
  background: color-mix(in srgb, var(--secondary) 88%, white);
  border-color: color-mix(in srgb, var(--secondary) 88%, white);
  color: var(--secondary-fg);
}

/* ── Cards ── */

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  color: var(--card-fg);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--muted);
  color: var(--muted-fg);
  padding: 0.22rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-success {
  background: color-mix(in srgb, var(--chart-5) 18%, var(--muted));
  color: var(--chart-5);
  border-color: color-mix(in srgb, var(--chart-5) 35%, var(--border));
}

.badge-private {
  background: color-mix(in srgb, var(--accent) 18%, var(--muted));
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}

.badge-primary {
  background: color-mix(in srgb, var(--primary) 18%, var(--muted));
  color: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 35%, var(--border));
}

/* ── Sections ── */

.section {
  padding: 4.5rem 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--secondary);
  margin: 0 0 0.75rem;
}

.section-title {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  letter-spacing: -0.03em;
  font-weight: 700;
}

.section-subtitle {
  margin-top: 0;
  margin-bottom: 1.5rem;
  color: var(--text-muted);
  max-width: 62ch;
  font-size: 1.02rem;
}

.grid {
  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));
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 520ms ease, transform 520ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ── Footer ── */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.25rem 0;
  margin-top: 2rem;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-links a {
  color: var(--muted-fg);
  font-size: 0.85rem;
}

.footer-links a:hover {
  color: var(--primary);
  text-decoration: none;
}

.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--foreground);
  min-height: 44px;
  min-width: 44px;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 220ms ease, visibility 220ms ease, transform 220ms ease,
    border-color 160ms ease;
  font-size: 1rem;
}

.back-to-top:hover {
  border-color: var(--primary);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ── Responsive ── */

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .menu-toggle {
    display: inline-grid;
    place-items: center;
  }

  .nav-links {
    position: absolute;
    top: calc(var(--nav-height) - 1px);
    left: 0;
    right: 0;
    padding: 0.75rem 1.25rem 1.25rem;
    flex-direction: column;
    border-bottom: 1px solid var(--border);
    background: color-mix(in srgb, var(--bg) 96%, transparent);
    backdrop-filter: blur(16px);
    transform-origin: top;
    transform: scaleY(0);
    opacity: 0;
    pointer-events: none;
    transition: transform 180ms ease, opacity 180ms ease;
  }

  .nav-links.is-open {
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .page-transition,
  .reveal,
  .button,
  .back-to-top,
  .nav-links {
    animation: none !important;
    transition: none !important;
  }
}