:root {
  --bg: #0f1115;
  --bg-soft: #151922;
  --card: #1a202b;
  --border: #2b3343;
  --text: #e8edf6;
  --text-muted: #a7b0c2;
  --accent: #79a8ff;
  --accent-strong: #98bcff;
  --shadow: 0 10px 24px rgba(0, 0, 0, 0.28);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 500px at 80% -10%, #20283a 0%, transparent 60%),
    var(--bg);
  line-height: 1.65;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  background: rgba(15, 17, 21, 0.78);
  border-bottom: 1px solid rgba(43, 51, 67, 0.6);
  z-index: 10;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.2px;
}

.nav-links {
  display: flex;
  gap: 1.1rem;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.hero {
  padding: 6rem 0 4rem;
}

.tagline {
  display: inline-block;
  margin: 0 0 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 4.6vw, 3.5rem);
  max-width: 12ch;
}

.hero-copy {
  margin: 1rem 0 1.6rem;
  max-width: 60ch;
  color: var(--text-muted);
}

.btn-primary {
  display: inline-block;
  background: linear-gradient(180deg, var(--accent-strong), var(--accent));
  color: #0d1420;
  text-decoration: none;
  font-weight: 700;
  border-radius: 0.7rem;
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow);
}

.section {
  padding: 2rem 0;
}

.section-head {
  margin-bottom: 1.2rem;
}

.section-head p {
  margin: 0.45rem 0 0;
  color: var(--text-muted);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
}

.post-card {
  background: linear-gradient(180deg, #1a202b, #171c26);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.1rem;
  box-shadow: var(--shadow);
}

.post-meta {
  margin: 0 0 0.55rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.post-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.45rem;
}

.post-card p {
  margin: 0;
}

.read-more-btn {
  margin-top: 1rem;
  background: transparent;
  color: var(--accent-strong);
  border: 1px solid var(--border);
  border-radius: 0.55rem;
  padding: 0.5rem 0.7rem;
  cursor: pointer;
}

.read-more-btn:hover {
  border-color: var(--accent);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.topic-chip {
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  font-size: 0.9rem;
}

.newsletter {
  display: grid;
  gap: 1rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.2rem;
  margin-bottom: 2.6rem;
}

.newsletter h2 {
  margin-bottom: 0.25rem;
}

.newsletter p {
  margin: 0;
  color: var(--text-muted);
}

.newsletter-form {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.newsletter-form input {
  flex: 1;
  min-width: 220px;
  border: 1px solid var(--border);
  background: #0f141d;
  color: var(--text);
  border-radius: 0.65rem;
  padding: 0.65rem 0.8rem;
  font: inherit;
}

.newsletter-form button {
  border: 0;
  border-radius: 0.65rem;
  background: var(--accent);
  color: #0d1420;
  font: inherit;
  font-weight: 700;
  padding: 0.65rem 0.9rem;
  cursor: pointer;
}

.form-message {
  min-height: 1.25rem;
  color: var(--accent-strong);
}

.site-footer {
  border-top: 1px solid rgba(43, 51, 67, 0.6);
  padding: 1.3rem 0 2rem;
}

.site-footer p {
  color: var(--text-muted);
  margin: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 700px) {
  .hero {
    padding-top: 5rem;
  }

  .nav-links {
    gap: 0.75rem;
    font-size: 0.95rem;
  }
}