:root {
  --primary: #14b8a6; /* teal-500 */
  --primary-hover: #0d9488; /* teal-600 */
  --bg: #0f172a; /* slate-900 */
  --bg-card: #1e293b; /* slate-800 */
  --text: #f8fafc; /* slate-50 */
  --text-muted: #94a3b8; /* slate-400 */
  --border: #334155; /* slate-700 */
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  padding: 2rem 1rem;
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 1.5rem;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--primary);
}

.hero {
  text-align: center;
  padding: 6rem 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  letter-spacing: -0.025em;
  background: linear-gradient(to bottom right, #fff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
}

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

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

.btn-secondary {
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-secondary:hover {
  background-color: var(--bg-card);
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 4rem 1rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.card {
  background-color: var(--bg-card);
  padding: 2rem;
  border-radius: 1rem;
  border: 1px solid var(--border);
  transition: transform 0.2s;
  text-decoration: none;
  color: inherit;
  display: block;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card p {
  color: var(--text-muted);
  font-size: 1rem;
}

.skill-detail {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.skill-detail h2 {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  color: var(--primary);
}

.skill-detail h3 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.skill-detail p, .skill-detail li {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.skill-detail ul {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

pre {
  background-color: #000;
  padding: 1.5rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border);
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.9rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
}

th, td {
  text-align: left;
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}

th {
  color: var(--primary);
}

footer {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--border);
  margin-top: 4rem;
}

.lang-switch {
  position: absolute;
  top: 1rem;
  right: 1rem;
}

.lang-switch a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  margin-left: 0.5rem;
}

.lang-switch a.active {
  color: var(--primary);
  font-weight: bold;
}