:root {
  --radius: 0.25rem;
  --background: oklch(0.16 0.006 260);
  --foreground: oklch(0.95 0.005 260);
  --surface: oklch(0.2 0.007 260);
  --surface-2: oklch(0.24 0.008 260);
  --card: oklch(0.2 0.007 260);
  --card-foreground: oklch(0.95 0.005 260);
  --primary: oklch(0.78 0.155 62);
  --primary-foreground: oklch(0.18 0.02 62);
  --muted: oklch(0.24 0.008 260);
  --muted-foreground: oklch(0.68 0.01 260);
  --border: oklch(0.3 0.008 260);
  --signal: oklch(0.78 0.155 62);
  --signal-dim: oklch(0.55 0.1 62);
  --ok: oklch(0.75 0.14 155);
  --wip: oklch(0.8 0.14 90);
  --planned: oklch(0.65 0.02 260);
  --code-kw: oklch(0.78 0.155 62);
  --code-type: oklch(0.8 0.1 200);
  --code-str: oklch(0.79 0.13 150);
  --code-num: oklch(0.8 0.11 320);
  --code-fn: oklch(0.88 0.06 90);
  --code-com: oklch(0.55 0.01 260);
  --code-punc: oklch(0.72 0.01 260);
  --font-sans: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  border-color: var(--border);
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--background);
  color: var(--foreground);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: color-mix(in oklab, var(--signal) 35%, transparent);
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.grid-bg {
  background-image:
    linear-gradient(
      to right,
      color-mix(in oklab, var(--border) 60%, transparent) 1px,
      transparent 1px
    ),
    linear-gradient(
      to bottom,
      color-mix(in oklab, var(--border) 60%, transparent) 1px,
      transparent 1px
    );
  background-size: 56px 56px;
}

.rule-x {
  border-top: 1px solid var(--border);
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted-foreground);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklab, var(--background) 86%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid color-mix(in oklab, var(--signal) 55%, var(--border));
  background: color-mix(in oklab, var(--signal) 12%, var(--surface));
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.nav-link {
  color: var(--muted-foreground);
  font-size: 0.875rem;
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--foreground);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1;
  padding: 0.65rem 0.95rem;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--primary);
  color: var(--primary-foreground);
}

.btn-primary:hover {
  filter: brightness(1.06);
}

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

.btn-ghost:hover {
  background: var(--surface-2);
}

.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.lang-toggle button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted-foreground);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  padding: 0.4rem 0.55rem;
  cursor: pointer;
}

.lang-toggle button[aria-pressed="true"] {
  background: var(--surface-2);
  color: var(--foreground);
}

.menu-btn {
  appearance: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--muted-foreground);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
}

.mobile-nav {
  display: none;
  border-top: 1px solid var(--border);
  background: var(--background);
}

.mobile-nav.open {
  display: block;
}

.hero-wrap {
  position: relative;
  overflow: hidden;
}

.hero-wrap::after {
  content: "";
  pointer-events: none;
  position: absolute;
  inset: 0;
  background: radial-gradient(
    720px 360px at 80% 10%,
    color-mix(in oklab, var(--signal) 10%, transparent),
    transparent 60%
  );
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--signal);
  letter-spacing: 0.08em;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.35rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0.55rem 0 0;
}

.section-lead {
  max-width: 46rem;
  color: var(--muted-foreground);
  font-size: 1.05rem;
  line-height: 1.65;
  margin: 1rem 0 0;
}

.code-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.code-block-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border);
  padding: 0.45rem 0.7rem;
}

.code-block-bar span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted-foreground);
}

.copy-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted-foreground);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  cursor: pointer;
  padding: 0.15rem 0.25rem;
}

.copy-btn:hover {
  color: var(--foreground);
}

.code-block pre {
  margin: 0;
  padding: 0.9rem 0.85rem 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.7;
}

.code-line {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.65rem;
}

.code-ln {
  color: color-mix(in oklab, var(--muted-foreground) 70%, transparent);
  text-align: right;
  user-select: none;
}

.tok-kw { color: var(--code-kw); }
.tok-type { color: var(--code-type); }
.tok-str { color: var(--code-str); }
.tok-num { color: var(--code-num); }
.tok-fn { color: var(--code-fn); }
.tok-com { color: var(--code-com); }
.tok-punc { color: var(--code-punc); }
.tok-cmd { color: var(--code-fn); }

.ascii-block {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius);
  padding: 0.85rem 1rem 1rem;
}

.ascii-block pre {
  margin: 0.55rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--foreground);
  white-space: pre;
  overflow-x: auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.18rem 0.42rem;
  white-space: nowrap;
}

.badge-ok {
  border-color: color-mix(in oklab, var(--ok) 40%, transparent);
  color: var(--ok);
}

.badge-done {
  border-color: var(--border);
  color: var(--planned);
}

.chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius);
  padding: 0.7rem 0.85rem;
}

.chip-name {
  font-size: 0.925rem;
}

.chip-cat {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-foreground);
}

.card {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem 1.2rem;
}

button.card {
  appearance: none;
  width: 100%;
  margin: 0;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
}

a.card:hover,
button.card:hover {
  border-color: color-mix(in oklab, var(--signal) 40%, var(--border));
}

.contact-copy .copy-btn {
  pointer-events: none;
}

.link-arrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1;
  color: var(--muted-foreground);
  transition: color 0.15s ease, transform 0.15s ease;
}

a.card:hover .link-arrow {
  color: var(--foreground);
  transform: translate(2px, -2px);
}

.card + .card {
  margin-top: 0;
}

.stat {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.55rem;
  letter-spacing: -0.03em;
}

.quote {
  border-left: 2px solid var(--signal);
  padding: 0.15rem 0 0.15rem 1rem;
  color: var(--muted-foreground);
  font-size: 1.05rem;
  line-height: 1.6;
}

.avatar {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  object-fit: cover;
}

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -3rem;
  z-index: 80;
  background: var(--primary);
  color: var(--primary-foreground);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 0.75rem;
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}