:root {
  --bg: #0b0f14;
  --bg-alt: #111823;
  --text: #e8edf2;
  --text-dim: #9aa7b4;
  --accent: #4fd1c5;
  --accent-dim: #2b6f6a;
  --border: #1f2a37;
  --radius: 10px;
  --container-w: 880px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

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

a:hover {
  text-decoration: underline;
}

h1, h2, h3 {
  line-height: 1.2;
  margin: 0 0 16px;
}

/* Header / nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 15, 20, 0.85);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}

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

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: 0.02em;
}

.logo .dot {
  color: var(--accent);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text-dim);
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  display: block;
}

/* Hero */
.hero {
  padding: 96px 24px 72px;
  text-align: left;
}

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  margin: 0 0 12px;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  margin-bottom: 8px;
}

.hero-role {
  font-size: 1.25rem;
  color: var(--text-dim);
  margin: 0 0 16px;
}

.hero-desc {
  max-width: 560px;
  color: var(--text-dim);
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #06201d;
}

.btn-primary:hover {
  background: #6fe0d5;
}

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

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

/* Sections */
.section {
  padding: 64px 24px;
  border-top: 1px solid var(--border);
}

.section h2 {
  font-size: 1.75rem;
}

.section > p {
  color: var(--text-dim);
  max-width: 620px;
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 28px;
}

.skill-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.skill-card h3 {
  color: var(--accent);
  font-size: 1.1rem;
}

.skill-card p {
  color: var(--text-dim);
  margin: 0;
  font-size: 0.95rem;
}

/* Portfolio */
.portfolio-placeholder {
  margin-top: 24px;
  background: var(--bg-alt);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.portfolio-placeholder p {
  color: var(--text-dim);
  margin-top: 0;
}

/* Contact */
.contact-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 1.05rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
}

.site-footer p {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin: 0;
}

/* Responsive nav */
@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 16px;
    display: none;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }

  .hero {
    padding-top: 64px;
  }
}