:root {
  --bg: #0a0e14;
  --surface: #11151c;
  --text: #e6edf3;
  --text-muted: #8b9eaf;
  --border: #21262d;
  --shadow: 0 6px 20px rgba(0,0,0,0.35);
  --accent: #00d4ff;       /* main cyber cyan */
  --blue: #58a6ff;         /* networking */
  --green: #3fb950;        /* DevOps */
  --red: #f85149;          /* security alerts */
  --purple: #b083f0;       /* AI/projects */
}

[data-theme="light"] {
  --bg: #f9fbfd;
  --surface: #ffffff;
  --text: #0d1117;
  --text-muted: #57606a;
  --border: #d0d7de;
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --accent: #0366d6;
  --blue: #0366d6;
  --green: #1a7f37;
  --red: #c91c1c;
  --purple: #6f42c1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background 0.4s ease, color 0.4s ease;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1.4rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  margin: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.9rem;
  letter-spacing: -0.8px;
}

header h1 a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.3s;
}

header h1 a:hover {
  color: var(--accent);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 2rem;
}

header nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 1rem;
  transition: color 0.3s;
}

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

#theme-toggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: color 0.3s, transform 0.3s;
}

#theme-toggle:hover {
  color: var(--accent);
  transform: scale(1.12);
}

main {
  padding: 5rem 0 8rem;
}

h1, h2, h3 {
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: -0.5px;
}

h2 {
  color: var(--accent);
  font-size: 2.1rem;
  margin-bottom: 1.8rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.7rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.2rem;
  margin: 2.5rem 0;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.card summary {
  font-size: 1.5rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  transition: color 0.3s;
}

.card summary:hover {
  color: var(--accent);
}

.card[open] summary {
  margin-bottom: 1.5rem;
}

.skill-group {
  margin: 3rem 0;
}

.skill-group h3 {
  color: var(--text);
  font-size: 1.3rem;
  margin-bottom: 1.3rem;
  font-weight: 600;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.skill-tag {
  background: var(--surface);
  color: var(--text);
  padding: 0.65rem 1.4rem;
  border-radius: 50px;
  font-size: 1rem;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.skill-tag:hover {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* Category colors */
.networking h3 { color: var(--blue); }
.devops h3 { color: var(--green); }
.security h3 { color: var(--red); }
.ai h3 { color: var(--purple); }

footer {
  text-align: center;
  padding: 4rem 0 2rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
}

/* Terminal-style bio trick */
.terminal {
  background: #0b0e14;
  color: #00d4ff;
  font-family: 'JetBrains Mono', monospace;
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid #21262d;
  margin: 2.5rem 0;
  white-space: pre-wrap;
}