:root {
  --ink: #0e1419;
  --ink-soft: #1c262e;
  --paper: #e8eef2;
  --mist: #d4dde4;
  --muted: #5a6b78;
  --accent: #0d9f8a;
  --accent-dim: #0a7a6a;
  --warn: #c45c26;
  --line: rgba(14, 20, 25, 0.12);
  --glow: rgba(13, 159, 138, 0.35);
  --font-display: "Instrument Serif", Georgia, serif;
  --font-body: "Outfit", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max: 72rem;
  --narrow: 40rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip:focus {
  left: 0;
}

.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.wrap.narrow {
  width: min(100% - 2.5rem, var(--narrow));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.5rem;
  gap: 1rem;
}

.mark {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  justify-content: flex-end;
}

.nav a {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
  transition: color 0.2s var(--ease);
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--ink);
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: min(92vh, 52rem);
  display: flex;
  align-items: flex-end;
  padding: 6rem 0 4.5rem;
  color: var(--paper);
  background: var(--ink);
  overflow: hidden;
}

.hero-plane {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(232, 238, 242, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 238, 242, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 60% 40%, black 20%, transparent 75%);
  animation: grid-drift 28s linear infinite;
}

.hero-glow {
  position: absolute;
  width: 70vmax;
  height: 70vmax;
  right: -20%;
  top: -25%;
  background:
    radial-gradient(circle at 40% 50%, var(--glow), transparent 55%),
    radial-gradient(circle at 70% 60%, rgba(196, 92, 38, 0.18), transparent 50%);
  animation: glow-breathe 9s var(--ease) infinite alternate;
}

.hero-scan {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    transparent 40%,
    rgba(232, 238, 242, 0.04) 48%,
    transparent 56%
  );
  background-size: 200% 100%;
  animation: scan 12s var(--ease) infinite;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 40rem;
  padding-bottom: 0.5rem;
}

.brand {
  margin: 0 0 1.25rem;
  font-size: clamp(1.75rem, 4.5vw, 2.75rem);
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--paper);
  animation: rise 0.9s var(--ease) both;
}

.hero h1 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.8vw, 2.45rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 18ch;
  animation: rise 0.9s var(--ease) 0.12s both;
}

.lede {
  margin: 0 0 2rem;
  font-size: 1.05rem;
  color: color-mix(in srgb, var(--paper) 78%, transparent);
  max-width: 36ch;
  animation: rise 0.9s var(--ease) 0.22s both;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  animation: rise 0.9s var(--ease) 0.32s both;
}

.cta {
  display: inline-flex;
  align-items: center;
  padding: 0.7rem 1.2rem;
  background: var(--accent);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}

.cta:hover {
  background: color-mix(in srgb, var(--accent) 85%, white);
  transform: translateY(-1px);
}

.cta.ghost {
  background: transparent;
  color: var(--paper);
  outline: 1px solid color-mix(in srgb, var(--paper) 35%, transparent);
}

.cta.ghost:hover {
  background: color-mix(in srgb, var(--paper) 8%, transparent);
}

.meta-bar {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--mist) 45%, var(--paper));
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  padding: 1.35rem 0;
}

.meta-k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.meta-v {
  font-size: 0.92rem;
  font-weight: 500;
}

.section {
  padding: 4.5rem 0;
}

.section.band {
  background: color-mix(in srgb, var(--mist) 35%, var(--paper));
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-dim);
}

.section h2 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.2vw, 2.35rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 22ch;
}

.section-lede {
  margin: 0 0 2.5rem;
  color: var(--muted);
  max-width: 42rem;
  font-size: 1.05rem;
}

.section p {
  margin: 0 0 1.15rem;
}

.section p:last-child {
  margin-bottom: 0;
}

.subhead {
  margin: 2.75rem 0 1rem;
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.layer-list {
  list-style: none;
  margin: 0 0 2.5rem;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.layer {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.layer.is-in {
  opacity: 1;
  transform: none;
}

.layer-n {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-dim);
  padding-top: 0.2rem;
}

.layer h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.layer p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.callout {
  padding: 1.5rem 0;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.callout-label {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--warn);
}

.callout p:last-child {
  margin: 0;
  max-width: 44rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem 3rem;
  margin-bottom: 0.5rem;
}

.split h3 {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.split ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--ink-soft);
}

.split li {
  margin-bottom: 0.75rem;
}

.split li::marker {
  color: var(--accent);
}

.controls {
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  gap: 0.65rem;
  counter-reset: c;
}

.controls li {
  counter-increment: c;
  padding: 0.85rem 1rem;
  background: var(--paper);
  border-left: 3px solid var(--accent);
  font-size: 0.92rem;
  font-weight: 500;
}

.controls li::before {
  content: counter(c, decimal-leading-zero);
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
  letter-spacing: 0.06em;
}

.framework-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem 1.75rem;
  margin: 0 0 1rem;
}

.framework-grid h4 {
  margin: 0 0 0.4rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.framework-grid p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.tier-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.tier-table th,
.tier-table td {
  text-align: left;
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.tier-table th {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.tier-table td:first-child {
  font-weight: 600;
  white-space: nowrap;
}

.plain-list {
  margin: 0 0 1.5rem;
  padding-left: 1.15rem;
}

.plain-list li {
  margin-bottom: 0.75rem;
}

.source-list {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
}

.source-list li {
  border-bottom: 1px solid var(--line);
}

.source-list a {
  display: block;
  padding: 0.85rem 0;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s var(--ease), padding-left 0.25s var(--ease);
}

.source-list a:hover {
  color: var(--accent-dim);
  padding-left: 0.35rem;
}

.footnote {
  font-size: 0.85rem;
  color: var(--muted);
  max-width: 40rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: baseline;
}

.site-footer p {
  margin: 0;
  font-size: 0.88rem;
}

.muted {
  color: var(--muted);
}

.muted a {
  color: inherit;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes glow-breathe {
  from {
    transform: scale(1) translate(0, 0);
    opacity: 0.85;
  }
  to {
    transform: scale(1.08) translate(-3%, 4%);
    opacity: 1;
  }
}

@keyframes grid-drift {
  from {
    background-position: 0 0, 0 0;
  }
  to {
    background-position: 48px 48px, 48px 48px;
  }
}

@keyframes scan {
  0%,
  100% {
    background-position: 100% 0;
  }
  50% {
    background-position: 0% 0;
  }
}

@media (max-width: 860px) {
  .meta-grid,
  .split,
  .framework-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }

  .hero {
    min-height: 88vh;
    align-items: flex-end;
    padding-top: 5rem;
  }
}

/* —— Acronym tooltips —— */
abbr.tip {
  text-decoration: none;
  border-bottom: 1px dotted color-mix(in srgb, var(--accent-dim) 55%, var(--muted));
  cursor: help;
  position: relative;
  font-variant-ligatures: none;
}

abbr.tip:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

abbr.tip::after {
  content: attr(data-tip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 0.55rem);
  transform: translateX(-50%) translateY(4px);
  width: max(12rem, min(22rem, 70vw));
  padding: 0.55rem 0.7rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 400;
  font-style: normal;
  letter-spacing: 0.01em;
  line-height: 1.4;
  text-align: left;
  text-transform: none;
  border-radius: 2px;
  box-shadow: 0 8px 28px rgba(14, 20, 25, 0.28);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease),
    visibility 0.18s;
  z-index: 60;
}

abbr.tip::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: calc(100% + 0.2rem);
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--ink);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.18s var(--ease), visibility 0.18s;
  z-index: 61;
}

abbr.tip:hover::after,
abbr.tip:hover::before,
abbr.tip:focus-visible::after,
abbr.tip:focus-visible::before {
  opacity: 1;
  visibility: visible;
}

abbr.tip:hover::after,
abbr.tip:focus-visible::after {
  transform: translateX(-50%) translateY(0);
}

.hero abbr.tip {
  border-bottom-color: color-mix(in srgb, var(--paper) 45%, transparent);
}

.hero abbr.tip::after {
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}

.hero abbr.tip::before {
  border-top-color: var(--paper);
}

@media (max-width: 860px) {
  abbr.tip::after {
    left: 0;
    transform: translateX(0) translateY(4px);
    width: min(18rem, 78vw);
  }

  abbr.tip:hover::after,
  abbr.tip:focus-visible::after {
    transform: translateX(0) translateY(0);
  }

  abbr.tip::before {
    left: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .layer,
  .reveal {
    opacity: 1;
    transform: none;
  }
}