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

:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #2f81f7;
  --accent-glow: rgba(47, 129, 247, 0.15);
  --tag-bg: rgba(47, 129, 247, 0.1);
  --tag-border: rgba(47, 129, 247, 0.3);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

/* Nav */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-name { font-weight: 600; font-size: 1rem; color: var(--text); }

.nav-links { display: flex; gap: 1.5rem; }
.nav-links a { color: var(--text-muted); font-size: 0.9rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* Sections */
section { max-width: 860px; margin: 0 auto; padding: 5rem 2rem; }

/* Hero */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 860px;
  margin: 0 auto;
  padding: 6rem 2rem 4rem;
}

.hero-label {
  font-size: 0.9rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.hero-desc {
  max-width: 560px;
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 2rem;
}

.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { opacity: 0.85; text-decoration: none; }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--text-muted); text-decoration: none; }

/* Section headings */
.section-heading {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-rule {
  width: 40px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-bottom: 2.5rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.about-text p { color: var(--text-muted); margin-bottom: 1rem; }

.about-details { display: flex; flex-direction: column; gap: 1rem; }

.detail-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.2rem;
}

.detail-card .label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.detail-card .value { font-size: 0.95rem; color: var(--text); }

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.skill-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem;
}

.skill-group h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 0.8rem;
}

.skill-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.tag {
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  color: var(--text);
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.4rem;
  transition: border-color 0.2s;
}

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

.project-card h3 { font-size: 1rem; margin-bottom: 0.5rem; }
.project-card p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 1rem; }
.project-card .tag { margin-right: 0.3rem; }

.project-link {
  font-size: 0.85rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.8rem;
}

/* Contact */
.contact-inner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2.5rem;
  text-align: center;
}

.contact-inner p {
  color: var(--text-muted);
  max-width: 480px;
  margin: 0.75rem auto 1.75rem;
}

.contact-links { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }

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

/* Responsive */
@media (max-width: 640px) {
  .about-grid { grid-template-columns: 1fr; }
  nav { padding: 1rem; }
  .nav-links { gap: 1rem; }
}