:root {
  --bg: #f5f6f7;
  --surface: #ffffff;
  --surface-soft: #f0f2f4;
  --text: #1f2933;
  --text-muted: #52606d;
  --line: #d9e2ec;
  --accent: #334e68;
  --accent-strong: #243b53;
  --radius: 14px;
  --shadow: 0 10px 25px rgba(31, 41, 51, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: var(--surface);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.container {
  width: min(1100px, 92vw);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(245, 246, 247, 0.92);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  min-height: 70px;
}

.brand {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.01em;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
}

.nav-list a {
  display: inline-block;
  padding: 0.35rem 0.45rem;
  border-radius: 8px;
}

.nav-list a:hover {
  background: var(--surface-soft);
  text-decoration: none;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 72vh;
  display: grid;
  place-items: center;
  background:
    linear-gradient(130deg, rgba(36, 59, 83, 0.87), rgba(51, 78, 104, 0.72)),
    url("assets/images/background.jpg") center/cover no-repeat,
    linear-gradient(135deg, #34495e, #6c7a89);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.12), transparent 45%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  color: #f8fafc;
  padding-block: 4rem;
}

.eyebrow {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.86;
}

h1,
h2,
h3 {
  font-family: "Source Serif 4", serif;
  line-height: 1.25;
  margin-top: 0;
}

h1 {
  font-size: clamp(2rem, 6vw, 3.4rem);
  margin-block: 0.4rem 0.8rem;
}

.hero-role {
  font-size: 1.07rem;
  font-weight: 700;
  margin: 0;
}

.hero-summary {
  max-width: 66ch;
  margin-top: 1rem;
}

.hero-actions {
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.btn {
  display: inline-block;
  border-radius: 999px;
  font-weight: 600;
  padding: 0.65rem 1rem;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-primary {
  background: #e7edf3;
  color: #102a43;
}

.btn-primary:hover {
  background: #dbe6ef;
}

.btn-ghost {
  border: 1px solid rgba(236, 242, 247, 0.65);
  color: #f8fafc;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
}

.section {
  padding-block: 4.2rem;
}

.section-alt {
  background: var(--surface-soft);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.about-layout {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1.25rem;
  align-items: center;
}

.profile-image {
  width: 180px;
  height: 180px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
  border: 3px solid var(--surface);
  box-shadow: var(--shadow);
  background: #d9e2ec;
}

.skills-grid,
.education-grid,
.projects-grid {
  margin-top: 1.3rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(12, 1fr);
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem;
  box-shadow: var(--shadow);
}

.skills-grid .card,
.education-grid .card {
  grid-column: span 6;
}

.timeline-item {
  background: var(--surface);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
}

.timeline-meta {
  margin-top: -0.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.project-card {
  grid-column: span 6;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(31, 41, 51, 0.1);
}

.project-tech {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.project-link {
  margin-top: 0.8rem;
  display: inline-block;
  font-weight: 700;
}

.cert-reference {
  margin-top: 0.65rem;
  display: inline-block;
  font-weight: 600;
}

.cert-reference.is-placeholder {
  color: var(--text-muted);
  cursor:pointer;
  text-decoration: none;
  border-bottom: 1px dashed var(--line);
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.contact-list li + li {
  margin-top: 0.45rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-wrap {
  min-height: 68px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 0.85rem;
}

@media (max-width: 900px) {
  .about-layout {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .skills-grid .card,
  .education-grid .card,
  .project-card {
    grid-column: span 12;
  }
}

@media (max-width: 700px) {
  .nav-wrap {
    min-height: auto;
    padding-block: 0.85rem;
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-list {
    flex-wrap: wrap;
  }

  .section {
    padding-block: 3.4rem;
  }

  .footer-wrap {
    flex-direction: column;
    justify-content: center;
    padding-block: 0.8rem;
  }
}