:root {
  --bg: #0f172a;
  --bg-soft: #111827;
  --card: #1e293b;
  --text: #e5e7eb;
  --muted: #cbd5e1;
  --accent: #38bdf8;
  --accent-dark: #0ea5e9;
  --border: #334155;
  --white: #ffffff;
  --max-width: 1100px;
}

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

body {
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, var(--bg), #020617);
  color: var(--text);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
}

header {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--border);
}

.hero {
  display: grid;
  gap: 20px;
}

.hero h1 {
  font-size: 2.4rem;
  color: var(--white);
}

.hero h2 {
  font-size: 1.2rem;
  color: var(--accent);
  font-weight: 600;
}

.hero p {
  color: var(--muted);
  max-width: 800px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
}

.btn {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 8px;
  font-weight: 600;
  transition: 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: #082f49;
}

.btn-primary:hover {
  background: var(--accent-dark);
  color: var(--white);
  text-decoration: none;
}

.btn-secondary {
  border: 1px solid var(--border);
  color: var(--white);
  background: transparent;
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

main {
  padding: 40px 0 60px;
}

section {
  margin-bottom: 50px;
}

section h2 {
  font-size: 1.8rem;
  margin-bottom: 18px;
  color: var(--white);
  border-left: 4px solid var(--accent);
  padding-left: 12px;
}

.section-intro {
  color: var(--muted);
  max-width: 850px;
  margin-bottom: 20px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 20px;
}

.card {
  background: rgba(30, 41, 59, 0.9);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

.card h3 {
  color: var(--white);
  margin-bottom: 10px;
  font-size: 1.1rem;
}

.card p {
  color: var(--muted);
  margin-bottom: 12px;
}

ul {
  padding-left: 20px;
}

li {
  margin-bottom: 8px;
  color: var(--muted);
}

.project {
  margin-bottom: 24px;
}

.project h3 {
  margin-bottom: 10px;
  color: var(--white);
}

.project-meta {
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 8px;
  font-weight: 600;
}

.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.tag {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.92rem;
}

footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
  color: var(--muted);
  text-align: center;
  font-size: 0.95rem;
}

@media (max-width: 800px) {
  .two-column {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero h2 {
    font-size: 1rem;
  }
}