:root {
  --bg: #0f1117;
  --surface: #161b22;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --accent2: #3fb950;
  --border: #30363d;
  --font: "Outfit", system-ui, sans-serif;
  --mono: "JetBrains Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

.container {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.header {
  border-bottom: 1px solid var(--border);
  background: rgba(15, 17, 23, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  max-width: 900px;
  margin: 0 auto;
}

.logo {
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  font-size: 1.15rem;
}

.nav {
  display: flex;
  gap: 1.25rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

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

/* Hero */
.hero {
  padding: 4rem 0 3.5rem;
  background: radial-gradient(ellipse 70% 50% at 50% 0%, rgba(88, 166, 255, 0.12), transparent);
}

.kicker {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent2);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin: 0 0 0.75rem;
}

.hero-title {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
}

.hero-lead {
  margin: 0 0 1.75rem;
  color: var(--muted);
  max-width: 560px;
  font-size: 1.05rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: var(--bg);
  text-decoration: none;
  font-weight: 600;
  border-radius: 8px;
  transition: opacity 0.2s;
}

.btn:hover {
  opacity: 0.9;
}

/* Sections */
.section {
  padding: 3rem 0;
}

.section-dark {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.h2 {
  margin: 0 0 1.5rem;
  font-size: 1.35rem;
}

.h2-light {
  color: var(--text);
}

.grid-3 {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.35rem;
}

.card-icon {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.tag-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-list li {
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 0.4rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
}

/* Inner pages */
.page-main {
  padding: 2.5rem 0 3rem;
}

.page-title {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
}

.page-intro {
  margin: 0 0 2rem;
  color: var(--muted);
}

.tech-blocks {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.tech-block {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.35rem;
  background: var(--surface);
}

.tech-block h2 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: var(--accent);
}

.tech-block p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.back {
  margin-top: 2rem;
}

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

.back a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
  margin-top: auto;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--muted);
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.mono {
  font-family: var(--mono);
}