/* CSS variables and theming */
:root {
  --bg: #ffffff;
  --text: #0f172a;
  --muted-text: #475569;
  --primary: #2563eb;
  --primary-contrast: #ffffff;
  --card: #f8fafc;
  --border: #e5e7eb;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --text: #e2e8f0;
    --muted-text: #94a3b8;
    --primary: #60a5fa;
    --primary-contrast: #0b1220;
    --card: #0f172a;
    --border: #1f2937;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
  }
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --text: #0f172a;
  --muted-text: #475569;
  --primary: #2563eb;
  --primary-contrast: #ffffff;
  --card: #f8fafc;
  --border: #e5e7eb;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.04);
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --text: #e2e8f0;
  --muted-text: #94a3b8;
  --primary: #60a5fa;
  --primary-contrast: #0b1220;
  --card: #0f172a;
  --border: #1f2937;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
}

/* Base */
* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue",
    Arial, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  position: absolute;
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  background: var(--primary);
  color: var(--primary-contrast);
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  z-index: 1000;
}

/* Layout */
.site-header {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand {
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  font-size: 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 0.35rem 0.6rem;
  border-radius: 0.5rem;
}

.theme-toggle {
  margin-left: auto;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  border-radius: 0.5rem;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
}

.nav-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin: 0 0 0 0.75rem;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  background: var(--card);
  padding: 0.35rem 0.6rem;
  border-radius: 0.5rem;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem;
}

.hero {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 1rem;
  align-items: center;
  padding: 1rem 0 0.5rem;
}

.avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--card);
}

.hero-text h1 {
  margin: 0 0 0.25rem 0;
  font-size: 1.75rem;
}

.hero-text p {
  margin: 0 0 0.75rem 0;
  color: var(--muted-text);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.hero-links {
  margin-top: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section {
  margin-top: 1.5rem;
}

.section-header h2 {
  margin: 0 0 0.25rem 0;
}

.section-subtitle {
  margin: 0 0 0.75rem 0;
  color: var(--muted-text);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  padding: 0.9rem;
}

.card-title {
  margin: 0 0 0.25rem 0;
  font-size: 1.05rem;
}

.card-desc {
  margin: 0 0 0.75rem 0;
  color: var(--muted-text);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

.tag {
  font-size: 0.75rem;
  padding: 0.15rem 0.45rem;
  border-radius: 1rem;
  background: rgba(99, 102, 241, 0.12);
  color: var(--text);
  border: 1px solid var(--border);
}

.card-actions {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  text-decoration: none;
}

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

.button[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
}

.empty-state {
  text-align: center;
  color: var(--muted-text);
  padding: 0.75rem 0;
}

.contact-list {
  margin: 0;
  padding-left: 1rem;
}

.contact-list a {
  word-break: break-all;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  padding: 1rem;
  text-align: center;
  color: var(--muted-text);
}

/* Responsive adjustments */
@media (min-width: 720px) {
  .hero {
    grid-template-columns: 128px 1fr;
    gap: 1.25rem;
  }
  .avatar {
    width: 128px;
    height: 128px;
  }
}

/* Focus styles */
:where(a, button, .button):focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}