:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #3fb950;
  --accent-dim: #238636;
  --sidebar-w: 220px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'DM Sans', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
}

/* Left sidebar */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 1.5rem 0;
  z-index: 100;
}

.sidebar-brand {
  padding: 0 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

.sidebar-brand a {
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.sidebar-brand a span {
  color: var(--accent);
}

.sidebar-nav {
  list-style: none;
}

.sidebar-nav a {
  display: block;
  padding: 0.5rem 1.25rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s, background 0.15s;
}

.sidebar-nav a:hover {
  color: var(--accent);
  background: rgba(63, 185, 80, 0.08);
}

.sidebar-nav a.active {
  color: var(--accent);
  font-weight: 600;
  border-left: 3px solid var(--accent);
  padding-left: calc(1.25rem - 3px);
}

/* Main content */
.main {
  flex: 1;
  margin-left: var(--sidebar-w);
  min-height: 100vh;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Hero (for home) */
header.page-header {
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

/* Home page only: photo above name, centered */
.home-hero {
  text-align: center;
}

.home-photo-wrap {
  margin-bottom: 1.25rem;
}

.home-photo {
  width: 200px;
  height: 200px;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--border);
  display: inline-block;
}

.home-hero .hero-name {
  margin-bottom: 0.35rem;
}

.home-hero .hero-tagline {
  margin-bottom: 0.75rem;
}

.home-hero .contact-bar {
  justify-content: center;
}


.hero-name {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
}

.hero-name span {
  color: var(--accent);
}

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

.contact-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-size: 0.85rem;
  margin-top: 0.75rem;
}

.contact-bar a,
.contact-bar span {
  color: var(--text-muted);
  text-decoration: none;
}

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

.contact-bar .sep {
  color: var(--border);
}

/* Page title */
.page-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

/* Summary */
.summary p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 65ch;
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.card:last-child {
  margin-bottom: 0;
}

.card-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.card-title {
  font-weight: 600;
  font-size: 1.05rem;
}

.card-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.card-sub {
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.card ul {
  list-style: none;
  padding-left: 0;
}

.card li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
}

/* Skills grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.75rem;
}

.skill-tag {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
  font-family: 'JetBrains Mono', monospace;
}

.certs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.cert-badge {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 1rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

footer {
  padding: 2rem 0 1rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1rem;
  }

  .sidebar-brand {
    padding: 0 0 0.75rem;
    margin-bottom: 0.5rem;
  }

  .main {
    margin-left: 0;
  }

  .sidebar-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
  }

  .sidebar-nav a {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
  }

  .sidebar-nav a.active {
    border-left: none;
    border-bottom: 2px solid var(--accent);
    padding-left: 0.75rem;
  }
}

@media (max-width: 600px) {
  .container {
    padding: 1.25rem 1rem;
  }

  .card-header {
    flex-direction: column;
    align-items: flex-start;
  }
}