:root {
  --navy: #1f3a5f;
  --navy-dark: #142942;
  --accent: #2e7d7d;
  --bg: #f7f8fa;
  --text: #2b2f36;
  --muted: #5a6270;
  --card-bg: #ffffff;
  --radius: 10px;
  --max-width: 960px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181f;
    --text: #e6e9ee;
    --muted: #a9b2c0;
    --card-bg: #1c222c;
    --navy: #4d7dbf;
    --navy-dark: #2f4f7a;
  }
  .avatar { border-color: #1c222c; }
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: #fff;
  color: var(--navy);
  padding: 0.6rem 1rem;
  z-index: 100;
  border-radius: 0 0 8px 0;
}
.skip-link:focus {
  left: 0;
}

* { box-sizing: border-box; }

picture { display: block; }

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

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

header.site-header {
  background: linear-gradient(135deg, var(--navy), var(--navy-dark));
  color: #fff;
  padding: 1.1rem 1.5rem;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  position: relative;
}

.brand {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.02em;
}

nav.main-nav ul {
  list-style: none;
  display: flex;
  gap: 1.4rem;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

nav.main-nav a {
  color: #e8edf3;
  font-weight: 600;
}

nav.main-nav a:hover,
nav.main-nav a.active {
  color: #ffffff;
  text-decoration: underline;
}

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 0.35rem 0.9rem;
  border-radius: 6px;
  text-decoration: none !important;
}
.nav-cta:hover { background: #24605f; }

.nav-toggle-checkbox { display: none; }
.nav-toggle-label {
  display: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.2rem 1.5rem 3rem;
}

.hero {
  text-align: center;
  padding: 2.5rem 1rem 1rem;
}

.hero h1 {
  font-size: 2.1rem;
  color: var(--navy);
  margin-bottom: 0.3rem;
}

.avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 3px 12px rgba(0,0,0,0.18);
  margin-bottom: 1rem;
  border: 3px solid #fff;
}

.hero p.tagline {
  color: var(--muted);
  font-size: 1.15rem;
  margin-top: 0;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.65rem 1.3rem;
  border-radius: var(--radius);
  font-weight: 600;
  margin: 0.4rem;
}
.button:hover { background: #24605f; text-decoration: none; }
.button.secondary {
  background: transparent;
  border: 2px solid var(--navy);
  color: var(--navy);
}
.button.secondary:hover { background: var(--navy); color: #fff; }

.cta-row { text-align: center; margin: 1.5rem 0 2.5rem; }

section { margin-bottom: 2.5rem; }

section h2 {
  color: var(--navy);
  border-bottom: 2px solid var(--navy);
  padding-bottom: 0.3rem;
  font-size: 1.3rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.4rem;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 6px 16px rgba(0,0,0,0.12); }

.card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
  filter: saturate(0.95);
}

.card .card-body { padding: 1rem 1.1rem 1.3rem; }
.card h3 { margin: 0 0 0.4rem; color: var(--navy); }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.job { margin-bottom: 1.6rem; }
.job h3 { margin-bottom: 0.1rem; color: var(--navy); }
.job .meta { color: var(--muted); font-style: italic; font-size: 0.92rem; margin-top: 0; margin-bottom: 0.5rem; }
.job ul { margin-top: 0.3rem; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.skills-grid .skill-block {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
.skill-block h4 { margin: 0 0 0.4rem; color: var(--navy); font-size: 1rem; }
.skill-block p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.resume-actions { text-align: center; margin: 1.2rem 0 2rem; }

.contact-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.6rem 1.8rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  max-width: 480px;
  margin: 0 auto;
}
.contact-card p { margin: 0.5rem 0; }
.contact-card .icon-label { font-weight: 600; color: var(--navy); }

.hobby-detail img {
  width: 100%;
  max-width: 700px;
  display: block;
  margin: 0 auto 1.2rem;
  border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.placeholder-note {
  background: #fff7e0;
  border: 1px solid #e8d488;
  color: #6b5a12;
  padding: 0.8rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
}

footer.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.project-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem 1.4rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.project-card h3 { margin: 0 0 0.5rem; color: var(--navy); }
.project-card p { color: var(--muted); font-size: 0.95rem; margin: 0 0 0.6rem; }
.project-card .project-tags { font-size: 0.82rem; font-style: italic; }

.cert-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 3px solid var(--navy);
}
.cert-timeline li {
  position: relative;
  padding: 0.15rem 0 0.15rem 1.2rem;
  margin-bottom: 0.35rem;
}
.cert-timeline li::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 0.45rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 3px solid var(--navy);
}
.cert-timeline li.in-progress::before {
  border-color: var(--accent);
  background: var(--accent);
}
.cert-timeline .cert-date {
  display: inline-block;
  min-width: 130px;
  color: var(--muted);
  font-size: 0.85rem;
  font-style: italic;
}
.cert-timeline .cert-name { font-weight: 600; }
.cert-timeline li.in-progress .cert-name::after {
  content: "in progress";
  font-weight: 400;
  font-style: italic;
  color: var(--accent);
  margin-left: 0.5rem;
  font-size: 0.8rem;
}

@media (max-width: 600px) {
  .hero h1 { font-size: 1.6rem; }
  .nav-toggle-label { display: block; position: absolute; right: 1.5rem; top: 1.1rem; }
  nav.main-nav {
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .nav-toggle-checkbox:checked ~ nav.main-nav {
    max-height: 400px;
  }
  nav.main-nav ul {
    flex-direction: column;
    gap: 0.6rem;
    padding: 0.8rem 0 0.2rem;
    text-align: center;
  }
}