/* ===== Variables ===== */
:root {
  --bg: #0d0f12;
  --bg-alt: #14171c;
  --surface: #1a1e24;
  --text: #e6e9ef;
  --text-muted: #8b909a;
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.15);
  --border: #2a2e36;
  --radius: 12px;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}

/* ===== Reset & base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; margin: 0; padding: 0; }

/* Skip link for accessibility & SEO */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 999;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius);
  transition: top 0.2s;
}
.skip-link:focus { top: 1rem; outline: 2px solid #fff; outline-offset: 2px; }

/* ===== Layout ===== */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}
.section-alt {
  background: var(--bg-alt);
}
.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 2rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 15, 18, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
}
.nav-logo:hover { text-decoration: none; color: var(--accent); }
.nav-links {
  display: flex;
  gap: 1.5rem;
}
.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-links a:hover { color: var(--text); }
.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);
}

/* ===== Hero ===== */
.hero {
  min-height: 85vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 4rem 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}
.hero-label {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 0.5rem;
}
.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
}
.hero-title .accent { color: var(--accent); }
.hero-tagline {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin: 0 0 2rem;
  max-width: 480px;
}
.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
}
.btn-primary:hover { background: #2563eb; text-decoration: none; }
.btn-outline {
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-outline:hover { background: var(--surface); border-color: var(--accent); text-decoration: none; }
.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: none;
}
.btn-ghost:hover { color: var(--text); background: var(--surface); text-decoration: none; }

/* Recruiter banner */
.recruiter-banner {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0.5rem 1rem;
  background: var(--accent-soft);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.recruiter-badge {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.recruiter-banner { order: -2; }
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  max-width: 320px;
}
.hero-card-label {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.hero-card strong { color: var(--text); font-size: 1.05rem; }
.hero-card span:last-child { font-size: 0.9rem; color: var(--text-muted); }

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 3rem;
  align-items: start;
}
.about-text .lead { font-size: 1.1rem; margin-top: 0; }
.about-text p { margin: 0 0 1rem; color: var(--text-muted); }
.about-text p:last-child { margin-bottom: 0; }
.about-meta {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.meta-label {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.meta-value { color: var(--text); font-weight: 500; }

/* ===== Skills ===== */
.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.skills-grid li {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
}

/* ===== Timeline ===== */
.timeline {
  position: relative;
  padding-left: 1.5rem;
  border-left: 2px solid var(--border);
  margin-left: 0.5rem;
}
.timeline-item {
  position: relative;
  padding-bottom: 2.5rem;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-marker {
  position: absolute;
  left: -1.5rem;
  top: 0.25rem;
  transform: translateX(-50%);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
}
.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.25rem;
  display: block;
}
.timeline-content h3 {
  font-size: 1.2rem;
  margin: 0 0 0.25rem;
  color: var(--text);
}
.timeline-content .company {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}
.timeline-content p:last-child {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ===== Projects ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.project-card h3 {
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
  color: var(--text);
}
.project-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ===== Tools ===== */
.tools-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tool {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  font-weight: 500;
}

/* ===== Education ===== */
.education-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.education-list li {
  color: var(--text-muted);
  font-size: 1rem;
}
.education-list strong { color: var(--text); margin-right: 0.5rem; }

/* ===== Contact ===== */
.contact-section { padding-bottom: 5rem; }
.contact-intro {
  color: var(--text-muted);
  margin: 0 0 1.5rem;
  max-width: 520px;
}
.contact-cta { font-size: 1.05rem; }
.contact-link-resume { border-color: var(--accent); color: var(--accent); }
.contact-link-resume:hover { background: var(--accent-soft); }
.contact-copy {
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 1rem;
}
.contact-copy.copied { border-color: #22c55e; color: #22c55e; }
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-weight: 500;
  transition: border-color 0.2s, background 0.2s;
}
.contact-link:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  text-decoration: none;
}
.contact-icon { font-size: 1.1rem; }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  background: var(--bg-alt);
}
.footer-inner { display: flex; flex-direction: column; gap: 0.5rem; }
.site-footer p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
}
.footer-keywords {
  font-size: 0.8rem;
  opacity: 0.85;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding-top: 2rem;
  }
  .hero-tagline { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .hero-visual { order: -1; }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .about-meta { flex-direction: row; flex-wrap: wrap; }
}

@media (max-width: 700px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem;
    gap: 0.5rem;
  }
  .nav-links.is-open { display: flex; }
  .nav-toggle { display: flex; }
  .section { padding: 3rem 0; }
  .hero-title { font-size: 2rem; }
  .timeline { padding-left: 1.25rem; margin-left: 0.25rem; }
  .timeline-marker { left: -1.25rem; width: 10px; height: 10px; }
}