/* Practical AI Dev — layout overrides beyond Tailwind */
:root {
  --bg-deep: #0a0c10;
  --surface: #12161c;
  --surface-2: #1a2029;
  --accent: #2dd4bf;
  --accent-dim: rgba(45, 212, 191, 0.12);
  --warm: #f97316;
  --text: #e4e7ec;
  --muted: #9ca3af;
  --rail-w: 16rem;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg-deep);
  color: var(--text);
}

/* Diagonal mesh background */
.mesh-bg {
  background-image:
    radial-gradient(ellipse 80% 50% at 20% 40%, rgba(45, 212, 191, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(249, 115, 22, 0.06), transparent),
    linear-gradient(165deg, #0a0c10 0%, #0f1218 50%, #0a0c10 100%);
}

/* Fixed side rail — non-traditional primary nav */
.rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 40;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg-deep) 100%);
  display: flex;
  flex-direction: column;
  padding: 1.75rem 1.25rem;
}

.rail-logo {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  letter-spacing: 0.2em;
  font-weight: 800;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: auto;
}

.rail-nav a {
  display: block;
  padding: 0.5rem 0;
  font-size: 0.8rem;
  color: var(--muted);
  transition: color 0.2s, transform 0.2s;
}

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

.main-offset {
  margin-left: var(--rail-w);
  min-height: 100vh;
}

/* Offset card stack */
.card-tilt:nth-child(odd) {
  transform: rotate(-0.4deg);
}

.card-tilt:nth-child(even) {
  transform: rotate(0.35deg);
}

.card-tilt:hover {
  transform: rotate(0deg) translateY(-4px);
  transition: transform 0.25s ease;
}

/* Accent line */
.accent-bar {
  height: 3px;
  width: 4rem;
  background: linear-gradient(90deg, var(--accent), var(--warm));
  border-radius: 2px;
}

/* Mobile top bar */
.mobile-bar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 0.875rem 1rem;
  background: rgba(10, 12, 16, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  align-items: center;
  justify-content: space-between;
}

.drawer {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s;
}

.drawer.open {
  pointer-events: auto;
  opacity: 1;
}

.drawer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
}

.drawer-panel {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: min(85vw, 20rem);
  background: var(--surface);
  padding: 1.5rem;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
}

.drawer.open .drawer-panel {
  transform: translateX(0);
}

@media (max-width: 1023px) {
  .rail {
    display: none;
  }

  .main-offset {
    margin-left: 0;
  }

  .mobile-bar {
    display: flex;
  }
}

@media (min-width: 1024px) {
  .mobile-bar {
    display: none !important;
  }
}

/* Prose for legal pages */
.legal-prose h2 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.legal-prose p,
.legal-prose li {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.legal-prose ul {
  list-style: disc;
  padding-left: 1.25rem;
}

/* Detail / field-note pages */
.article-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content a:hover {
  color: #5eead4;
}