:root {
  color-scheme: dark;
  --bg: #0d1117;
  --bg-elevated: #161b22;
  --bg-hover: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-soft: rgba(88, 166, 255, 0.12);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  --radius: 12px;
  --radius-sm: 8px;
  --tier-highest: #3fb950;
  --tier-high: #58a6ff;
  --tier-medium: #d29922;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", monospace;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f8fa;
  --bg-elevated: #ffffff;
  --bg-hover: #f0f3f6;
  --border: #d0d7de;
  --text: #1f2328;
  --text-muted: #656d76;
  --accent: #0969da;
  --accent-soft: rgba(9, 105, 218, 0.1);
  --shadow: 0 8px 24px rgba(31, 35, 40, 0.08);
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.app {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.header-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.brand h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.25rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.icon-btn {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  border-radius: var(--radius-sm);
  width: 2.5rem;
  height: 2.5rem;
  cursor: pointer;
  font-size: 1.1rem;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.icon-btn:hover {
  background: var(--bg-hover);
}

.search-row {
  margin-bottom: 1rem;
}

.search-field {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.search-icon {
  color: var(--text-muted);
  font-size: 1.1rem;
}

.search-field input {
  flex: 1;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  outline: none;
}

.search-field input::placeholder {
  color: var(--text-muted);
}

.filters {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--text);
}

.chip.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.results-meta {
  margin: 1rem 0 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.skill-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
  text-decoration: none;
  color: inherit;
}

.skill-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: var(--bg-hover);
}

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

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.card-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
}

.badge {
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
}

.tier-highest {
  color: var(--tier-highest);
  border-color: color-mix(in srgb, var(--tier-highest) 35%, transparent);
  background: color-mix(in srgb, var(--tier-highest) 12%, transparent);
}

.tier-high {
  color: var(--tier-high);
  border-color: color-mix(in srgb, var(--tier-high) 35%, transparent);
  background: color-mix(in srgb, var(--tier-high) 12%, transparent);
}

.tier-medium {
  color: var(--tier-medium);
  border-color: color-mix(in srgb, var(--tier-medium) 35%, transparent);
  background: color-mix(in srgb, var(--tier-medium) 12%, transparent);
}

.card-description {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  flex: 1;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.meta-pill {
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 0.25rem;
}

.repo-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-link {
  font-size: 0.72rem;
  color: var(--accent);
  flex-shrink: 0;
}

.file-link:hover {
  text-decoration: underline;
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 3rem 1rem;
}

.footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

@media (max-width: 640px) {
  .app {
    padding: 1.25rem 1rem 2rem;
  }

  .skill-grid {
    grid-template-columns: 1fr;
  }
}