:root {
  --bg: #0b0f14;
  --bg-alt: #111823;
  --card: #131b26;
  --border: #22303f;
  --text: #dce6f0;
  --text-dim: #8fa3b8;
  --accent: #4fd1a5;
  --accent-dim: #2a5c4a;
  --tag-siem: #4fd1a5;
  --tag-dns: #63a9ff;
  --tag-http: #f2b84b;
  --tag-cloud: #ff9f5a;
  --tag-aiml: #c792ea;
  --tag-forensics: #ff6b81;
  --tag-crypto: #5ec8d8;
  --max-width: 1080px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa;
    --bg-alt: #ffffff;
    --card: #ffffff;
    --border: #dde3ea;
    --text: #16202a;
    --text-dim: #536373;
    --accent: #1f8f6b;
    --accent-dim: #d7f0e6;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.brand-mark {
  color: var(--accent);
  font-family: "SF Mono", Menlo, Consolas, monospace;
}

nav { display: flex; gap: 24px; }
nav a { color: var(--text-dim); font-weight: 500; font-size: 0.95rem; }
nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
  padding: 72px 0 56px;
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 12px;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.2;
  margin: 0 0 16px;
  max-width: 720px;
}

.hero-sub {
  color: var(--text-dim);
  max-width: 620px;
  font-size: 1.05rem;
  margin: 0 0 32px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}

.stat { display: flex; flex-direction: column; }
.stat-num { font-size: 1.8rem; font-weight: 700; color: var(--accent); }
.stat-label { color: var(--text-dim); font-size: 0.9rem; }

/* Sections */
.section { padding: 56px 0; }
.section h2 { font-size: 1.6rem; margin: 0 0 8px; }
.section-sub { color: var(--text-dim); max-width: 680px; margin: 0 0 32px; }

/* Lab cards */
.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.lab-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.lab-card h3 { margin: 0; font-size: 1.05rem; }

.lab-tag {
  display: inline-block;
  width: fit-content;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--accent);
}

.tag-dns { color: var(--tag-dns); background: color-mix(in srgb, var(--tag-dns) 18%, transparent); }
.tag-http { color: var(--tag-http); background: color-mix(in srgb, var(--tag-http) 18%, transparent); }
.tag-siem { color: var(--tag-siem); background: color-mix(in srgb, var(--tag-siem) 18%, transparent); }
.tag-cloud { color: var(--tag-cloud); background: color-mix(in srgb, var(--tag-cloud) 18%, transparent); }
.tag-aiml { color: var(--tag-aiml); background: color-mix(in srgb, var(--tag-aiml) 18%, transparent); }
.tag-forensics { color: var(--tag-forensics); background: color-mix(in srgb, var(--tag-forensics) 18%, transparent); }
.tag-crypto { color: var(--tag-crypto); background: color-mix(in srgb, var(--tag-crypto) 18%, transparent); }
.tag-appsec { color: var(--tag-http); background: color-mix(in srgb, var(--tag-http) 18%, transparent); }
.tag-network { color: var(--tag-dns); background: color-mix(in srgb, var(--tag-dns) 18%, transparent); }

.lab-summary { color: var(--text-dim); margin: 0; font-size: 0.92rem; }

.about-section p { max-width: 680px; }

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.skill-group h3 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin: 0 0 12px;
}

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  font-size: 0.85rem;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
}

/* Featured project */
.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.project-card h3 { margin: 0; font-size: 1.3rem; }
.project-card .lab-summary { font-size: 1rem; }

.project-links { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 4px; }

.btn {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn:hover { border-color: var(--accent); text-decoration: none; color: var(--accent); }
.btn-primary { background: var(--accent-dim); color: var(--accent); border-color: transparent; }
.btn-primary:hover { color: var(--accent); }

/* Domain sub-nav within Labs */
.domain-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 40px;
}

.domain-nav a {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
}
.domain-nav a:hover { color: var(--text); border-color: var(--accent); text-decoration: none; }

.domain-block { margin-bottom: 48px; scroll-margin-top: 80px; }
.domain-block:last-child { margin-bottom: 0; }

.domain-heading { margin: 0 0 16px; }
.domain-heading h3 { margin: 0; font-size: 1.25rem; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--text-dim);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  nav { gap: 14px; }
  .hero { padding: 48px 0 40px; }
  .hero-stats { gap: 24px; }
}