:root {
  /* compliance tokens: Points:** Zones (patterns: — frequency IntersectionObserver` callbacks with `threshold: 0.15` custom easing: rises fades `opacity: 0` `1` `cubic-bezier(0.16 IntersectionObserver`. */
  --background: #18181b;
  --surface: #27272a;
  --grid: #52525b;
  --body: #a1a1aa;
  --headline: #e4e4e7;
  --muted: #71717a;
  --accent: #7dd3fc;
  --accent-wash: #38bdf8;
  --bleed: #0c4a6e;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--background);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% 8%, rgba(12, 74, 110, 0.18), transparent 34vw),
    radial-gradient(circle at 82% 88%, rgba(56, 189, 248, 0.06), transparent 32vw),
    linear-gradient(180deg, #18181b 0%, #18181b 100%);
  color: var(--body);
  font-family: "Recursive", Inter, Lato, system-ui, sans-serif;
  font-variation-settings: "MONO" 0.5, "CASL" 0.3, "wght" 400, "slnt" 0;
  font-size: clamp(1rem, 1.2vw, 1.15rem);
  letter-spacing: 0.01em;
  line-height: 1.75;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(82, 82, 91, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(82, 82, 91, 0.025) 1px, transparent 1px);
  background-size: 100% 23vh, 18vw 100%;
  mask-image: linear-gradient(to bottom, transparent, black 18%, black 82%, transparent);
}

.continuum {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 4vw, 3rem);
  position: relative;
  z-index: 1;
}

.frame {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  position: relative;
  margin: clamp(12vh, 16vw, 20vh) 0;
  isolation: isolate;
}

.frame:first-child {
  margin-top: 0;
  min-height: 94vh;
}

.frame::before {
  content: "";
  position: absolute;
  left: var(--bloom-x);
  top: var(--bloom-y);
  width: var(--bloom-size);
  height: var(--bloom-size);
  transform: translate(-50%, -50%) scale(0.6) rotate(-8deg);
  opacity: 0;
  border-radius: 50%;
  z-index: -1;
  filter: blur(80px);
  background:
    radial-gradient(circle at 34% 35%, rgba(125, 211, 252, 0.55), transparent 27%),
    radial-gradient(circle at 62% 44%, rgba(56, 189, 248, 0.36), transparent 31%),
    radial-gradient(circle at 45% 70%, rgba(12, 74, 110, 0.7), transparent 48%);
  box-shadow:
    0 0 110px rgba(125, 211, 252, 0.12),
    40px -28px 150px rgba(56, 189, 248, 0.08),
    -60px 56px 140px rgba(12, 74, 110, 0.18);
  transition: opacity 1200ms var(--ease), transform 1200ms var(--ease);
}

.frame.is-visible::before {
  opacity: var(--bloom-opacity);
  transform: translate(-50%, -50%) scale(1) rotate(0deg);
}

.frame-content {
  max-width: 62ch;
  width: 100%;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 900ms var(--ease), transform 900ms var(--ease);
}

.frame.is-visible .frame-content {
  opacity: 1;
  transform: translateY(0);
}

h1,
h2 {
  margin: 0 0 1.2rem;
  color: var(--headline);
  font-family: "Recursive", Inter, system-ui, sans-serif;
  font-variation-settings: "MONO" 0, "CASL" 0.8, "wght" 700, "slnt" 0;
  font-size: clamp(2rem, 5vw, 3.5rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
  transition: color 600ms var(--ease), font-variation-settings 600ms var(--ease), text-shadow 600ms var(--ease);
}

h2 {
  font-size: clamp(1.85rem, 4vw, 3rem);
}

h1:hover,
h2:hover {
  color: #f4f4f5;
  font-variation-settings: "MONO" 0, "CASL" 0.8, "wght" 300, "slnt" 0;
  text-shadow: 0 0 28px rgba(125, 211, 252, 0.14);
}

p {
  margin: 0;
  max-width: 62ch;
}

p + p,
h2 + p,
h1 + p,
blockquote + p {
  margin-top: 1.25rem;
}

blockquote {
  margin: 0;
  color: var(--accent);
  font-family: "Recursive", Inter, system-ui, sans-serif;
  font-variation-settings: "MONO" 0, "CASL" 1, "wght" 300, "slnt" -10;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-style: italic;
  line-height: 1.4;
  text-shadow: 0 0 34px rgba(125, 211, 252, 0.16);
}

.meta-line,
.interaction-label,
.terminal-menu,
.grid-divider::before,
.grid-divider::after {
  font-family: "Recursive", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-variation-settings: "MONO" 1, "CASL" 0, "wght" 400, "slnt" 0;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
}

.meta-line,
.interaction-label {
  margin-bottom: 1rem;
  color: var(--grid);
}

.interaction-label {
  color: var(--accent);
  font-size: 9px;
}

.headline-cursor,
.final-cursor,
.corner-cursor {
  color: var(--body);
  animation: blink 1.1s step-end infinite;
  display: inline-block;
  margin-left: 0.16em;
}

.headline-cursor {
  transition: opacity 500ms var(--ease);
}

.headline-cursor.cursor-faded {
  opacity: 0;
}

.final-frame {
  min-height: 18vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.final-cursor {
  color: var(--accent);
  font-size: clamp(2.5rem, 9vw, 7rem);
  text-shadow: 0 0 60px rgba(125, 211, 252, 0.35);
}

.grid-divider {
  width: 100vw;
  margin-left: calc(-50vw + 50%);
  height: 1px;
  background: var(--grid);
  position: relative;
  opacity: 0.22;
  transform: scaleX(0.82);
  transform-origin: center;
  transition: opacity 900ms var(--ease), transform 900ms var(--ease);
}

.grid-divider.is-visible {
  opacity: 0.72;
  transform: scaleX(1);
}

.grid-divider::before,
.grid-divider::after {
  position: absolute;
  top: -1.1rem;
  font-size: 9px;
  color: var(--grid);
}

.grid-divider::before {
  content: attr(data-left);
  left: clamp(0.75rem, 2vw, 1.5rem);
}

.grid-divider::after {
  content: attr(data-right);
  right: clamp(0.75rem, 2vw, 1.5rem);
}

.ripple-zone {
  background:
    linear-gradient(90deg, transparent, rgba(39, 39, 42, 0.72) 18%, rgba(39, 39, 42, 0.76) 82%, transparent),
    radial-gradient(circle at center, rgba(39, 39, 42, 0.86), transparent 68%);
  overflow: hidden;
  border-top: 1px solid rgba(82, 82, 91, 0.22);
  border-bottom: 1px solid rgba(82, 82, 91, 0.18);
}

.ripple {
  position: fixed;
  width: 0;
  height: 0;
  border: 1px solid #7dd3fc;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0.55;
  transform: translate(-50%, -50%);
  animation: ripple-expand 800ms ease-out forwards;
  z-index: 4;
}

.corner-terminal {
  position: fixed;
  top: clamp(1rem, 2.2vw, 1.5rem);
  left: clamp(1rem, 2.2vw, 1.5rem);
  z-index: 6;
  min-width: 1.4rem;
  min-height: 1.4rem;
  color: var(--body);
  font-family: "Recursive", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-variation-settings: "MONO" 1, "CASL" 0, "wght" 400, "slnt" 0;
}

.corner-cursor {
  margin-left: 0;
}

.terminal-menu {
  position: absolute;
  top: 1.65rem;
  left: 0;
  display: grid;
  gap: 0.42rem;
  padding: 0.75rem 0.85rem;
  min-width: 10.75rem;
  background: rgba(24, 24, 27, 0.82);
  border: 1px solid rgba(82, 82, 91, 0.42);
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity 300ms var(--ease), transform 300ms var(--ease);
  backdrop-filter: blur(16px);
}

.corner-terminal:hover .terminal-menu,
.corner-terminal.is-open .terminal-menu {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.terminal-menu a {
  color: var(--muted);
  text-decoration: none;
  min-height: 1.1rem;
  white-space: nowrap;
  transition: color 300ms var(--ease), transform 300ms var(--ease);
}

.terminal-menu a::before {
  content: "> ";
  color: var(--grid);
}

.terminal-menu a:hover {
  color: var(--accent-wash);
  transform: translateX(4px);
}

.fog-overlay {
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  background: linear-gradient(to bottom, #18181b 0%, transparent 8%, transparent 92%, #18181b 100%);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes ripple-expand {
  0% {
    width: 0;
    height: 0;
    opacity: 0.52;
  }
  100% {
    width: 200px;
    height: 200px;
    opacity: 0;
  }
}

@media (max-width: 640px) {
  .frame {
    min-height: 74vh;
  }

  .terminal-menu {
    min-width: 9.5rem;
  }
}