/* ─── Container ─────────────────────────────────────────────── */

.container {
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

/* ─── Header (base) — animation in header.css ────────────────── */

header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 50;
  height: var(--header-height);
  background: rgba(8, 12, 24, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.logo-mark {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-cyan));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}

nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

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

.btn-outline {
  color: var(--color-text) !important;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  transition: border-color var(--transition-fast), background var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-outline:hover {
  border-color: var(--color-accent-light);
  background: var(--color-surface);
  text-decoration: none;
}

/* ─── Main ───────────────────────────────────────────────────── */

main {
  /* Hero fills 100vh and draws behind the transparent header — intentional */
}

/* ─── Section: About ─────────────────────────────────────────── */

.about {
  padding-block: var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
  background: radial-gradient(ellipse 60% 40% at 80% 50%, rgba(8, 145, 178, 0.05) 0%, transparent 70%);
}

.about .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.about-heading {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.about-lead {
  font-size: var(--font-lead);
  color: var(--color-text-muted);
  max-width: 62ch;
  line-height: 1.85;
}

.about-lead strong {
  color: var(--color-text);
}

.about-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

.about-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-cyan-light);
}

.about-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.75;
}

/* ─── Section: Features ──────────────────────────────────────── */

.features {
  padding-block: var(--space-2xl);
}

.features-header {
  margin-bottom: var(--space-xl);
}

.features-heading {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.features-lead {
  font-size: var(--font-lead);
  color: var(--color-text-muted);
  max-width: 60ch;
  line-height: 1.8;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(460px, 1fr));
  gap: var(--space-md);
}

@media (max-width: 640px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }
}

/* ─── Feature Card (base) — animation in feature-cards.css ──── */

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  border-color: rgba(167, 139, 250, 0.4);
  box-shadow: var(--shadow-glow-accent);
}

.card-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.card-body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  flex: 1;
}

.card-block {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.75;
}

.card-block strong {
  display: block;
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: 0.3rem;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.code-snippet {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-cyan-light);
  overflow-x: auto;
  white-space: pre;
}

.card-why {
  background: rgba(109, 40, 217, 0.07);
  border: 1px solid rgba(109, 40, 217, 0.2);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.75;
}

.card-why strong {
  display: block;
  color: var(--color-accent-light);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.3rem;
}

/* ─── Guide Badge ────────────────────────────────────────────── */

.guide-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(8, 145, 178, 0.1);
  border: 1px solid rgba(8, 145, 178, 0.3);
  color: var(--color-cyan-light);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  width: fit-content;
}

.guide-badge::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-cyan);
}

/* ─── Footer ─────────────────────────────────────────────────── */

footer {
  padding-block: var(--space-xl);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.footer-inner p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-links a:hover {
  color: var(--color-accent-light);
}