:root {
  --bg:        #04060F;
  --bg-mid:    #070A14;
  --surface:   #0C1020;
  --border:    rgba(0,180,255,0.12);
  --blue:      #00B4FF;
  --blue-dim:  #006EA8;
  --text:      #B8C8D8;
  --muted:     #6B7E91;
  --white:     #FFFFFF;
  --glow:      0 0 8px rgba(0,180,255,0.55), 0 0 20px rgba(0,180,255,0.18);
  --glow-sm:   0 0 5px rgba(0,180,255,0.40);
  --font-d:    'Space Grotesk', sans-serif;
  --font-b:    'Inter', sans-serif;
  --font-m:    'JetBrains Mono', monospace;
  --r:         4px;
  --ease:      0.2s ease;
}

*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-b); background: var(--bg); color: var(--text); line-height: 1.6; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* Nav */
nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(4,6,15,0.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.nav-inner { max-width: 1100px; margin: 0 auto; padding: 0 2rem; height: 60px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-family: var(--font-m); font-weight: 500; font-size: 1rem; color: var(--blue); letter-spacing: 0.05em; text-shadow: var(--glow-sm); }
.nav-links { display: flex; gap: 2rem; }
.nav-links a { font-family: var(--font-m); font-size: 0.8rem; color: var(--muted); transition: color var(--ease), text-shadow var(--ease); }
.nav-links a:hover { color: var(--blue); text-shadow: var(--glow-sm); }

/* Hero */
.hero { background: var(--bg); min-height: 100vh; display: flex; align-items: center; position: relative; overflow: hidden; padding-top: 60px; }
.hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 45% 60% at 62% 48%, rgba(0,180,255,0.08) 0%, transparent 70%); pointer-events: none; }
.hero::after { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(0,180,255,0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(0,180,255,0.04) 1px, transparent 1px); background-size: 36px 36px; pointer-events: none; }
.hero-inner { max-width: 1100px; margin: 0 auto; padding: 6rem 2rem; position: relative; z-index: 1; }
.eyebrow { font-family: var(--font-m); font-size: 0.78rem; color: var(--blue); letter-spacing: 0.08em; margin-bottom: 1.5rem; display: flex; align-items: center; gap: 0.75rem; text-shadow: var(--glow-sm); }
.eyebrow::before { content: '> '; color: var(--blue-dim); }
.hero h1 { font-family: var(--font-m); font-size: clamp(2.4rem, 5.5vw, 4.5rem); font-weight: 500; color: var(--blue); line-height: 1.1; letter-spacing: -0.01em; margin-bottom: 0.75rem; text-shadow: var(--glow); }
.hero h1 .dim { color: var(--blue-dim); text-shadow: none; }
.hero-mono { font-family: var(--font-m); font-size: 0.95rem; color: var(--blue-dim); margin-bottom: 2rem; }
.cursor { display: inline-block; width: 0.55em; height: 0.72em; background: var(--blue); vertical-align: baseline; margin-left: 2px; animation: blink 1.1s step-end infinite; box-shadow: var(--glow-sm); }
@keyframes blink { 50% { opacity: 0; } }
.hero-desc { font-size: 1rem; color: var(--muted); max-width: 520px; line-height: 1.75; margin-bottom: 2.5rem; font-family: var(--font-m); }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.btn-p { display: inline-flex; align-items: center; gap: 0.5rem; border: 1px solid var(--blue); color: var(--blue); font-family: var(--font-m); font-weight: 500; font-size: 0.85rem; padding: 0.7rem 1.6rem; border-radius: var(--r); transition: background var(--ease), color var(--ease), transform var(--ease), box-shadow var(--ease); text-shadow: var(--glow-sm); box-shadow: inset 0 0 12px rgba(0,180,255,0.06); }
.btn-p:hover { background: var(--blue); color: var(--bg); transform: translateY(-1px); box-shadow: var(--glow); text-shadow: none; }
.btn-s { display: inline-flex; align-items: center; gap: 0.5rem; border: 1px solid var(--border); color: var(--muted); font-family: var(--font-m); font-size: 0.85rem; padding: 0.7rem 1.6rem; border-radius: var(--r); transition: border-color var(--ease), color var(--ease), text-shadow var(--ease); }
.btn-s:hover { background: var(--blue); color: var(--bg); border-color: var(--blue); transform: translateY(-1px); box-shadow: var(--glow); text-shadow: none; }
.hero-stats { display: flex; gap: 3rem; margin-top: 4rem; padding-top: 3rem; border-top: 1px solid var(--border); }
.stat-val { font-family: var(--font-m); font-size: 1.9rem; font-weight: 500; color: var(--blue); line-height: 1; text-shadow: var(--glow); }
.stat-label { font-family: var(--font-m); font-size: 0.72rem; color: var(--muted); margin-top: 0.4rem; letter-spacing: 0.06em; }

/* Sections */
section { padding: 6rem 2rem; }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section-eyebrow { font-family: var(--font-m); font-size: 0.72rem; color: var(--blue); letter-spacing: 0.1em; margin-bottom: 0.75rem; text-transform: uppercase; text-shadow: var(--glow-sm); }
.section-title { font-family: var(--font-d); font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 600; color: var(--white); margin-bottom: 1rem; line-height: 1.2; }
.section-lead { color: var(--muted); line-height: 1.75; margin-bottom: 3rem; }

/* About */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.about-img-wrap { position: relative; }
.about-img-wrap img { width: 100%; border-radius: var(--r); border: 1px solid var(--border); display: block; }
.about-img-wrap::before { content: ''; position: absolute; inset: -6px; border: 1px solid var(--blue); border-radius: var(--r); opacity: 0.25; pointer-events: none; box-shadow: 0 0 20px rgba(0,180,255,0.12); }
.tag-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.5rem; }
.tag { font-family: var(--font-m); font-size: 0.72rem; padding: 0.3rem 0.7rem; border: 1px solid var(--border); border-radius: 2px; color: var(--muted); }

/* Focus */
#focus { background: var(--bg-mid); }
.focus-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.focus-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 2rem; transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease); }
.focus-card:hover { border-color: var(--blue); transform: translateY(-3px); box-shadow: 0 0 20px rgba(0,180,255,0.08); }
.focus-icon { font-family: var(--font-m); font-size: 0.75rem; color: var(--blue); margin-bottom: 1.25rem; letter-spacing: 0.06em; text-shadow: var(--glow-sm); }
.focus-card h3 { font-family: var(--font-d); font-size: 1.1rem; font-weight: 600; color: var(--white); margin-bottom: 0.75rem; }
.focus-card p { font-size: 0.9rem; color: var(--muted); line-height: 1.7; }

/* Projects */
.project-list { display: flex; flex-direction: column; gap: 1.5rem; }
.project-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 2rem; display: grid; grid-template-columns: 1fr auto; align-items: start; gap: 1.5rem; transition: border-color var(--ease), box-shadow var(--ease); }
.project-card:hover { border-color: var(--blue); box-shadow: 0 0 16px rgba(0,180,255,0.06); }
.proj-eyebrow { font-family: var(--font-m); font-size: 0.7rem; color: var(--blue-dim); margin-bottom: 0.5rem; letter-spacing: 0.06em; }
.project-card h3 { font-family: var(--font-d); font-size: 1.15rem; font-weight: 600; color: var(--white); margin-bottom: 0.5rem; }
.project-card p { font-size: 0.9rem; color: var(--muted); line-height: 1.65; }
.proj-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.proj-tag { font-family: var(--font-m); font-size: 0.68rem; padding: 0.25rem 0.6rem; border: 1px solid rgba(0,180,255,0.22); border-radius: 2px; color: var(--muted); }
.proj-link { font-family: var(--font-m); font-size: 0.78rem; color: var(--blue); white-space: nowrap; border: 1px solid var(--border); padding: 0.4rem 1rem; border-radius: var(--r); transition: border-color var(--ease), text-shadow var(--ease); text-shadow: var(--glow-sm); }
.proj-link:hover { border-color: var(--blue); }

/* Skills */
#skills { background: var(--bg-mid); }
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
.skill-group h4 { font-family: var(--font-m); font-size: 0.75rem; color: var(--blue); letter-spacing: 0.08em; margin-bottom: 1rem; text-shadow: var(--glow-sm); }
.skill-items { display: flex; flex-direction: column; gap: 0.75rem; }
.skill-row { display: flex; align-items: center; gap: 1rem; }
.skill-name { font-family: var(--font-m); font-size: 0.82rem; color: var(--text); width: 210px; flex-shrink: 0; }
.skill-bar { flex: 1; height: 2px; background: rgba(0,180,255,0.08); border-radius: 2px; overflow: hidden; }
.skill-fill { height: 100%; background: var(--blue); border-radius: 2px; box-shadow: 0 0 6px rgba(0,180,255,0.6); }

/* Certs */
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.cert-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); padding: 1.5rem 1.25rem; text-align: center; transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease); }
.cert-card:hover { border-color: var(--blue); transform: translateY(-2px); box-shadow: 0 0 14px rgba(0,180,255,0.08); }
.cert-icon { font-family: var(--font-m); font-size: 0.68rem; color: var(--blue); margin-bottom: 0.75rem; letter-spacing: 0.06em; text-shadow: var(--glow-sm); }
.cert-card h4 { font-family: var(--font-d); font-size: 0.85rem; font-weight: 600; color: var(--white); line-height: 1.3; margin-bottom: 0.25rem; }
.cert-card span { font-family: var(--font-m); font-size: 0.68rem; color: var(--muted); }

/* Contact */
#contact { background: var(--bg-mid); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
.contact-links { display: flex; flex-direction: column; gap: 0.75rem; margin-top: 2rem; }
.contact-link { display: flex; align-items: center; gap: 1rem; font-family: var(--font-m); font-size: 0.85rem; color: var(--muted); border: 1px solid var(--border); padding: 0.85rem 1.25rem; border-radius: var(--r); transition: border-color var(--ease), color var(--ease), text-shadow var(--ease), box-shadow var(--ease); }
.contact-link:hover { border-color: var(--blue); color: var(--blue); text-shadow: var(--glow-sm); box-shadow: 0 0 12px rgba(0,180,255,0.06); }
.cl-label { font-size: 0.7rem; color: var(--blue-dim); margin-right: auto; letter-spacing: 0.06em; }

/* Footer */
footer { padding: 2rem; border-top: 1px solid var(--border); text-align: center; font-family: var(--font-m); font-size: 0.75rem; color: var(--muted); }

/* Responsive */
@media (max-width: 768px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .focus-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: repeat(3, 1fr); }
  .skills-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 1.5rem; }
  .project-card { grid-template-columns: 1fr; }
  .nav-links { gap: 1rem; }
}