/* AI Tech Unpacked — layout & motion beyond Tailwind utilities */

:root {
  --rail-width: min(22rem, 38vw);
  --glow-violet: rgba(139, 92, 246, 0.35);
  --glow-cyan: rgba(34, 211, 238, 0.2);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
}

.font-display {
  font-family: "Syne", system-ui, sans-serif;
}

/* Split shell: fixed left rail + scroll main */
.shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.rail {
  position: relative;
  z-index: 40;
  box-sizing: border-box;
  background: linear-gradient(165deg, #050508 0%, #0c0a12 45%, #08080f 100%);
  border-right: 1px solid rgba(139, 92, 246, 0.15);
}

@media (min-width: 1024px) {
  /*
    Do not use flex-row here: a fixed-position rail can still reserve flex space in some
    engines, which stacks with main-stage’s margin-left and leaves a visible gap. Block
    layout + margin on main aligns flush to the rail edge.
  */
  .shell {
    display: block;
    min-height: 100vh;
  }

  /*
    Tailwind utilities on <aside> (e.g. w-full, formerly lg:w-auto) can load after this
    sheet and override width. Lock the rail width explicitly; must match .main-stage margin.
  */
  aside.rail {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 40;
    width: var(--rail-width) !important;
    max-width: var(--rail-width);
  }
}

.rail::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 10%, var(--glow-violet), transparent 55%),
    radial-gradient(ellipse 60% 40% at 80% 90%, var(--glow-cyan), transparent 50%);
  pointer-events: none;
  opacity: 0.9;
}

.rail-inner {
  position: relative;
  z-index: 1;
}

.vertical-marquee {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.35em;
  font-size: 0.65rem;
  text-transform: uppercase;
  color: rgba(244, 244, 245, 0.12);
  user-select: none;
}

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

.main-stage {
  flex: 1;
  background: #0a0a0f;
}

@media (min-width: 1024px) {
  .main-stage {
    flex: none;
    display: block;
    margin-left: var(--rail-width) !important;
    min-height: 100vh;
    min-width: 0;
  }
}

/* Diagonal clip hero band */
.hero-clip {
  clip-path: polygon(0 0, 100% 0, 100% 92%, 0 100%);
}

.mesh-bg {
  background-color: #0a0a0f;
  background-image:
    linear-gradient(rgba(139, 92, 246, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 92, 246, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
}

.card-tilt {
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.card-tilt:hover {
  transform: translateY(-4px) rotate(-0.25deg);
  box-shadow: 0 24px 48px -12px rgba(139, 92, 246, 0.15);
}

.article-body h2 {
  font-family: "Syne", system-ui, sans-serif;
  font-size: 1.35rem;
  font-weight: 600;
  color: #f4f4f5;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.article-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: #a1a1aa;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.article-body p {
  margin-bottom: 1rem;
  line-height: 1.75;
  color: #d4d4d8;
}

.article-body ul {
  margin: 0.75rem 0 1rem 1.25rem;
  list-style: disc;
  color: #d4d4d8;
}

.article-body ol {
  margin: 0.75rem 0 1rem 1.25rem;
  list-style: decimal;
  color: #d4d4d8;
  padding-left: 1.25rem;
}

.article-body li {
  margin-bottom: 0.35rem;
}

.article-body a {
  color: #a78bfa;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: #22d3ee;
}

/* Mobile drawer */
.drawer-overlay {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.drawer-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.drawer-panel {
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Focus rings for a11y */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid #a78bfa;
  outline-offset: 2px;
}