/* Shared nav for SQL guide pages */
nav {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}

nav .inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
}

nav a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--muted);
  transition: color 0.2s;
  cursor: none;
}

nav a:hover { color: var(--accent); }
nav .logo { color: var(--accent) !important; font-weight: 600; }

/* Generic layout */
.sql-page {
  max-width: 980px;
  margin: 0 auto;
  padding: 56px 24px 88px;
}

.sql-header {
  margin-bottom: 36px;
  animation: fadeIn 0.4s ease both;
}

.sql-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.sql-header h1 {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 5vw, 2.9rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: var(--text);
}

.sql-header p {
  max-width: 720px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
}

.sql-header p strong {
  color: var(--text);
  font-weight: 600;
}

.sql-meta {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sql-pill {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 99px;
  color: var(--accent3);
  border: 1px solid rgba(255,214,10,0.25);
  background: rgba(255,214,10,0.07);
}

.sql-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 30px 0 40px;
}

/* Landing page lesson cards */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 14px;
}

.lesson-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(14,19,24,0.95) 0%, rgba(11,15,20,0.95) 100%);
  padding: 16px 18px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  cursor: none;
}

.lesson-card:hover {
  border-color: rgba(0,255,157,0.45);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.28);
}

.lesson-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.lesson-title {
  color: var(--text);
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.4;
}

.lesson-summary {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

.lesson-cta {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--accent3);
  text-transform: uppercase;
}

.sql-links {
  margin-top: 28px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.sql-links a {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--dim);
  letter-spacing: 0.05em;
  transition: color 0.2s, border-color 0.2s;
  cursor: none;
}

.sql-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* Chapter pages */
.chapter {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(14,19,24,0.75);
  padding: 28px 30px;
}

.chapter h2,
.chapter h3,
.chapter h4 {
  font-family: var(--font-mono);
  line-height: 1.35;
}

.chapter h2 {
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 34px 0 14px;
  color: var(--accent);
}

.chapter h2:first-child { margin-top: 0; }

.chapter h3 {
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  margin: 22px 0 12px;
  color: #9ad8ff;
}

.chapter h4 {
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  margin: 18px 0 10px;
  color: #97d2b8;
}

.chapter p {
  color: #c2d4e0;
  font-size: 1rem;
  line-height: 1.82;
  margin-bottom: 16px;
}

.chapter ul,
.chapter ol {
  margin: 0 0 18px 22px;
  color: #c2d4e0;
}

.chapter li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.chapter hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}

.chapter a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(0,255,157,0.28);
  transition: border-color 0.2s;
  cursor: none;
}

.chapter a:hover { border-color: var(--accent); }

.chapter code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent3);
  background: rgba(20,26,34,0.9);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
}

.chapter pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  margin: 16px 0 22px;
}

.chapter pre code {
  padding: 0;
  border: none;
  border-radius: 0;
  background: transparent;
  color: #a8f6ce;
  font-size: 0.8rem;
  line-height: 1.62;
}

.chapter-nav {
  margin-top: 18px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.chapter-nav a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--dim);
  letter-spacing: 0.06em;
  transition: color 0.2s, border-color 0.2s;
  cursor: none;
}

.chapter-nav a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.sql-footer {
  margin-top: 34px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 700px) {
  .sql-page {
    padding-top: 42px;
  }

  .chapter {
    padding: 20px 18px;
  }

  nav .inner {
    padding: 0 16px;
  }
}