:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --primary: #2563eb;
  --border: #e5e7eb;
  --shadow: rgba(0, 0, 0, 0.08);
}

body.dark {
  --bg: #0f172a;
  --card: #111827;
  --text: #f9fafb;
  --muted: #9ca3af;
  --primary: #60a5fa;
  --border: #374151;
  --shadow: rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.hero {
  min-height: 90vh;
  padding: 28px;
}

.nav {
  max-width: 1150px;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 800;
  font-size: 22px;
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  font-weight: 600;
}

.nav-links a:hover {
  color: var(--primary);
}

button,
.btn {
  border: 0;
  cursor: pointer;
  border-radius: 12px;
  padding: 11px 16px;
  font-weight: 700;
  display: inline-block;
}

#themeToggle {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
}

.hero-content {
  max-width: 900px;
  margin: 130px auto 0;
}

.badge {
  display: inline-block;
  background: var(--card);
  color: var(--primary);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  font-weight: 700;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: 58px;
  line-height: 1.1;
  margin-bottom: 10px;
}

.hero h2 {
  font-size: 28px;
  color: var(--primary);
  margin-bottom: 20px;
}

.hero p {
  color: var(--muted);
  max-width: 750px;
  font-size: 18px;
}

.hero-actions,
.contact-actions {
  margin-top: 28px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.primary {
  background: var(--primary);
  color: white;
}

.secondary {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
}

main {
  max-width: 1150px;
  margin: auto;
  padding: 28px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 32px;
  margin-bottom: 26px;
  box-shadow: 0 14px 35px var(--shadow);
}

.card h2 {
  margin-bottom: 18px;
  font-size: 28px;
}

.card p {
  color: var(--muted);
}

.info-grid,
.skills-grid,
.projects-grid {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.info-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.info-grid div {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
}

.skills-grid {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.skill {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  font-weight: 700;
}

.filters {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.filter {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}

.filter.active {
  background: var(--primary);
  color: white;
}

.projects-grid {
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
}

.project {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  transition: 0.2s ease;
}

.project:hover {
  transform: translateY(-6px);
}

.project h3 {
  margin-bottom: 10px;
}

.project p {
  margin-bottom: 16px;
}

.tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.tags span {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 13px;
  color: var(--muted);
}

.project a {
  color: var(--primary);
  font-weight: 800;
}

.timeline {
  display: grid;
  gap: 16px;
}

.timeline-item {
  background: var(--bg);
  border-left: 4px solid var(--primary);
  padding: 16px;
  border-radius: 12px;
}

.safe-list {
  padding-left: 22px;
  color: var(--muted);
}

.safe-list li {
  margin-bottom: 8px;
}

.copy-status {
  margin-top: 14px;
  color: var(--primary);
  font-weight: 700;
}

footer {
  text-align: center;
  padding: 30px;
  color: var(--muted);
}

@media (max-width: 700px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 18px;
  }

  .hero-content {
    margin-top: 80px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero h2 {
    font-size: 22px;
  }

  .card {
    padding: 24px;
  }
}