:root {
  --space-unit: 8px;
  --space-xs: 8px; --space-sm: 16px; --space-md: 32px; --space-lg: 64px; --space-xl: 128px;
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --color-ink: #0F172A; /* Slate 900 */
  --color-paper: #F8FAFC; /* Slate 50 */
  --color-paper-alt: #F1F5F9; /* Slate 100 */
  --color-muted: #64748B; /* Slate 500 */
  --color-border: #E2E8F0; /* Slate 200 */
  --color-accent: #0F766E; /* Teal 700 - Distinct from Bob Henry */
  --color-accent-hover: #115E59; /* Teal 800 */
  --color-success: #059669; --color-success-light: #D1FAE5;
  --max-width: 1200px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-sans); color: var(--color-ink); background: var(--color-paper); line-height: 1.6; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md); }
.site-header { padding: var(--space-md) 0; border-bottom: 1px solid var(--color-border); background: #fff; position: sticky; top: 0; z-index: 100; }
.nav-grid { display: flex; justify-content: space-between; align-items: center; }
.nav-links { display: flex; gap: var(--space-md); list-style: none; }
.nav-links a { font-weight: 500; color: var(--color-ink); padding: 8px 0; }
.nav-links a:hover { color: var(--color-accent); text-decoration: none; }
.logo-mark { background: var(--color-ink); color: #fff; padding: 4px 8px; font-weight: bold; border-radius: 4px; margin-right: 8px; }
.site-logo { font-weight: 700; display: flex; align-items: center; font-size: 1.25rem; color: var(--color-ink); }
.site-logo:hover { text-decoration: none; }

.section { padding: var(--space-xl) 0; }
.section-alt { background: var(--color-paper-alt); }
.section-title { font-size: 2rem; margin-bottom: var(--space-lg); text-align: center; color: var(--color-ink); }

.hero { text-align: center; padding: var(--space-xl) 0; }
.hero h1 { font-size: clamp(2.5rem, 5vw, 4rem); line-height: 1.1; margin-bottom: var(--space-md); letter-spacing: -0.02em; color: var(--color-ink); }
.hero .lead { font-size: 1.25rem; color: var(--color-muted); max-width: 800px; margin: 0 auto var(--space-lg); }
.btn { display: inline-block; padding: 12px 24px; background: var(--color-accent); color: #fff; border-radius: 6px; font-weight: 600; transition: background 0.2s; }
.btn:hover { background: var(--color-accent-hover); text-decoration: none; }

.grid { display: grid; gap: var(--space-lg); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media(max-width: 900px){ .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media(max-width: 600px){ .grid-4, .grid-3, .grid-2, .bio-grid { grid-template-columns: 1fr !important; } }

.card { background: #fff; border: 1px solid var(--color-border); border-radius: 8px; padding: var(--space-lg); transition: transform 0.2s, box-shadow 0.2s; }
.card:hover { transform: translateY(-2px); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05); }
.service-icon { font-size: 2.5rem; display: block; margin-bottom: var(--space-sm); }
.card h3 { font-size: 1.25rem; margin-bottom: var(--space-xs); }
.card p { color: var(--color-muted); }

.terminal { background: #1E293B; color: #F8FAFC; padding: var(--space-lg); border-radius: 8px; font-family: var(--font-mono); font-size: 0.9rem; line-height: 1.7; box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.terminal .prompt { color: #14B8A6; }
.terminal .output { color: #A3E635; margin-left: var(--space-md); display: block; }
.metrics .metric { display: flex; justify-content: space-between; border-bottom: 1px solid var(--color-border); padding: 12px 0; }
.metrics .metric:last-child { border-bottom: none; }

.project-meta { margin-bottom: var(--space-sm); font-size: 0.875rem; }
.tag { background: #e2e8f0; padding: 4px 10px; border-radius: 12px; font-weight: 600; margin-right: 8px; display: inline-block; color: #334155; }
.tech-stack { display: flex; gap: 8px; flex-wrap: wrap; margin-top: var(--space-md); }
.tech-stack span { font-family: var(--font-mono); font-size: 0.75rem; background: var(--color-paper-alt); padding: 4px 10px; border-radius: 12px; border: 1px solid var(--color-border); }

table { width: 100%; border-collapse: collapse; margin: var(--space-md) 0; font-size: 0.9rem; }
th, td { text-align: left; padding: 12px; border-bottom: 1px solid var(--color-border); }
th { background: var(--color-paper-alt); font-weight: 600; }
.delta { color: var(--color-accent); font-weight: 700; font-family: var(--font-mono); }

.bio-grid { display: grid; grid-template-columns: 2fr 1fr; gap: var(--space-xl); }
.contact-card { background: var(--color-paper-alt); padding: var(--space-lg); border-radius: 8px; margin-top: var(--space-lg); border: 1px solid var(--color-border); }
.contact-card a { display: block; margin-bottom: 8px; font-weight: 500; }

.site-footer { background: var(--color-ink); color: #fff; padding: var(--space-xl) 0 var(--space-md); margin-top: var(--space-xl); }
.site-footer a { color: #94A3B8; }
.site-footer a:hover { color: #fff; }
.site-footer h4 { margin-bottom: var(--space-sm); color: #fff; text-transform: uppercase; font-size: 0.875rem; letter-spacing: 0.05em; }
.footer-bottom { display: flex; justify-content: space-between; border-top: 1px solid #334155; padding-top: var(--space-md); margin-top: var(--space-lg); font-size: 0.875rem; color: #94A3B8; }