:root {
  --bg: #f6f8fb;
  --text: #1e293b;
  --muted: #64748b;
  --dark: #0f172a;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --card: #ffffff;
  --border: #dbe3ef;
}

* { box-sizing: border-box; }

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

.nav {
  display: flex;
  justify-content: center;
  gap: 22px;
  padding: 20px;
  background: rgba(15, 23, 42, 0.75);
}

.nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
}

.hero {
  background: linear-gradient(135deg, #0f172a, #1e3a8a);
  color: #fff;
  min-height: 520px;
}

.hero-content {
  max-width: 980px;
  margin: 0 auto;
  padding: 90px 24px 110px;
  text-align: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-size: 0.88rem;
  color: #bfdbfe;
  font-weight: 700;
}

h1 {
  font-size: clamp(2.4rem, 7vw, 5rem);
  line-height: 1.05;
  margin: 14px 0 20px;
}

.hero-text {
  font-size: 1.35rem;
  max-width: 830px;
  margin: 0 auto 14px;
}

.hero-subtext {
  color: #dbeafe;
  max-width: 780px;
  margin: 0 auto 34px;
}

.button {
  display: inline-block;
  padding: 13px 22px;
  margin: 6px;
  border-radius: 999px;
  background: #fff;
  color: var(--accent-dark);
  text-decoration: none;
  font-weight: 700;
}

.button.secondary {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.65);
}

.section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 58px 24px;
}

.section h2 {
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 18px;
  color: var(--dark);
}

.intro {
  text-align: center;
  max-width: 980px;
}

.skill-grid,
.mini-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.mini-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card,
.timeline-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
}

.card.featured { border-top: 5px solid var(--accent); }
.card.muted { background: #f8fafc; }

.card h3,
.timeline-item h3 {
  margin-top: 0;
  color: var(--dark);
}

.timeline-item {
  margin-bottom: 18px;
  border-left: 6px solid var(--border);
}

.timeline-item.primary {
  border-left-color: var(--accent);
}

.meta {
  color: var(--muted);
  font-weight: 700;
  margin-top: -8px;
}

.secondary-section {
  background: #eef4ff;
  border-radius: 26px;
  margin-top: 20px;
  margin-bottom: 20px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tags span {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 700;
}

.footer {
  text-align: center;
  padding: 54px 24px;
  background: var(--dark);
  color: #fff;
}

.footer a { color: #bfdbfe; }
.small { color: #cbd5e1; font-size: 0.9rem; }

@media (max-width: 900px) {
  .skill-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 650px) {
  .nav { flex-wrap: wrap; gap: 14px; }
  .skill-grid,
  .mini-grid { grid-template-columns: 1fr; }
  .hero-content { padding: 64px 18px 80px; }
}