:root {
  color-scheme: light dark;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;

  --color-bg: #f8f9fb;
  --color-bg-alt: #eef1f6;
  --color-surface: #ffffff;
  --color-text: #1a1d26;
  --color-text-muted: #5c6478;
  --color-border: #d8dee9;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-focus: #2563eb;

  --shadow-sm: 0 1px 2px rgb(16 24 40 / 6%);
  --shadow-md: 0 4px 16px rgb(16 24 40 / 8%);

  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;

  --container: 72rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f1117;
    --color-bg-alt: #161922;
    --color-surface: #1c2030;
    --color-text: #e8eaf0;
    --color-text-muted: #9aa3b5;
    --color-border: #2d3448;
    --color-accent: #60a5fa;
    --color-accent-hover: #93c5fd;
    --color-focus: #60a5fa;

    --shadow-sm: 0 1px 2px rgb(0 0 0 / 30%);
    --shadow-md: 0 4px 16px rgb(0 0 0 / 40%);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

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

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: var(--space-md);
  z-index: 100;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  text-decoration: none;
}

.skip-link:focus {
  left: var(--space-md);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: var(--space-md);
}

.logo {
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

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

.nav-list a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
}

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

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

.hero-inner {
  max-width: 42rem;
}

.eyebrow {
  margin: 0 0 var(--space-sm);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.hero h1 {
  margin: 0 0 var(--space-md);
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0 0 var(--space-xl);
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  color: var(--color-text-muted);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

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

.section-alt {
  background: var(--color-bg-alt);
}

.section h2 {
  margin: 0 0 var(--space-md);
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.01em;
}

.section p {
  margin: 0;
  max-width: 65ch;
}

.section-header {
  margin-bottom: var(--space-xl);
}

.section-lead {
  color: var(--color-text-muted);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
  gap: var(--space-lg);
}

.projects-loading,
.projects-empty,
.projects-error {
  grid-column: 1 / -1;
  color: var(--color-text-muted);
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}

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

.project-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-sm);
}

.project-card h3 {
  margin: 0;
  font-size: 1.125rem;
  line-height: 1.3;
}

.project-card h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.project-card h3 a:hover {
  color: var(--color-accent);
}

.project-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.badge {
  padding: 0.125rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 999px;
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.badge-archived {
  background: color-mix(in srgb, var(--color-text-muted) 15%, transparent);
}

.project-description {
  flex: 1;
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm) var(--space-md);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.language-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.language-dot {
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  background: var(--color-accent);
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 0.875rem;
  font-weight: 600;
}

.project-links a {
  text-decoration: none;
}

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

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-inner p {
  margin: 0;
}

.footer-inner a {
  text-decoration: none;
}

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

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