:root {
  --bg: #ffffff;
  --bg-alt: #f6f7fb;
  --text: #1a1d29;
  --text-muted: #5b6178;
  --accent: #4c5fd5;
  --accent-dark: #3a49ab;
  --border: #e4e6f0;
  --radius: 10px;
  --max-width: 880px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* Header / Nav */

.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

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

/* Hero */

.hero {
  padding: 96px 24px 72px;
}

.eyebrow {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.headline {
  font-size: 1.15rem;
  color: var(--accent-dark);
  font-weight: 600;
  margin: 0 0 20px;
}

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

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Buttons */

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-dark);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

/* Sections */

section h2 {
  font-size: 1.6rem;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.about,
.projects,
.contact {
  padding: 64px 24px;
  border-top: 1px solid var(--border);
}

.about p {
  color: var(--text-muted);
  max-width: 680px;
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
}

.skills li {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
}

/* Projects */

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.project-tag {
  align-self: flex-start;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--accent-dark);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.project-card h3 {
  margin: 4px 0 0;
  font-size: 1.1rem;
}

.project-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: 0;
  flex: 1;
}

.project-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}

.project-link:hover {
  color: var(--accent-dark);
}

/* Contact */

.contact p {
  color: var(--text-muted);
  max-width: 520px;
}

.contact-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 24px;
}

/* Footer */

.site-footer {
  padding: 32px 24px 48px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Responsive */

@media (max-width: 600px) {
  .nav-links {
    gap: 14px;
  }

  .hero {
    padding: 64px 20px 48px;
  }

  .about,
  .projects,
  .contact {
    padding: 48px 20px;
  }
}