/* ========== Tokens ========== */
:root {
  /* Palette: off-white default */
  --bg: #f6f4ef;
  --bg-elev: #ede9e0;
  --ink: #1a1714;
  --ink-soft: #4a4540;
  --ink-mute: #8a847b;
  --rule: #c8c2b6;
  --rule-soft: #d9d3c6;
  --paper: #fbfaf6;
  --accent: #1a1714;

  /* Type stacks (overridden by tweaks) */
  --font-sans: "Zen Kaku Gothic New", system-ui, sans-serif;
  --font-serif: "Zen Old Mincho", "Hiragino Mincho ProN", serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", monospace;

  /* Motion */
  --motion: 1;
  --ease-out: cubic-bezier(0.2, 0.7, 0.2, 1);
  --ease-arc: cubic-bezier(0.65, 0.04, 0.35, 1);
}

/* Palette variants */
[data-palette="warm"] {
  --bg: #efeae0;
  --bg-elev: #e4dccd;
  --ink: #221d16;
  --ink-soft: #534a3d;
  --ink-mute: #8a7f6c;
  --rule: #c0b69e;
  --rule-soft: #cfc6b1;
  --paper: #f4efe3;
  --accent: #221d16;
}
[data-palette="mono"] {
  --bg: #f4f4f4;
  --bg-elev: #e8e8e8;
  --ink: #0c0c0c;
  --ink-soft: #3a3a3a;
  --ink-mute: #8a8a8a;
  --rule: #cccccc;
  --rule-soft: #dcdcdc;
  --paper: #fafafa;
  --accent: #0c0c0c;
}

/* Type variants */
[data-type="zen"] {
  --font-sans: "Zen Kaku Gothic New", system-ui, sans-serif;
  --font-serif: "Zen Old Mincho", "Hiragino Mincho ProN", serif;
}
[data-type="noto"] {
  --font-sans: "Noto Sans JP", system-ui, sans-serif;
  --font-serif: "Noto Serif JP", "Hiragino Mincho ProN", serif;
}
[data-type="shippori"] {
  --font-sans: "Zen Kaku Gothic New", system-ui, sans-serif;
  --font-serif: "Shippori Mincho", "Hiragino Mincho ProN", serif;
}
[data-type="plex"] {
  --font-sans: "IBM Plex Sans JP", system-ui, sans-serif;
  --font-serif: "Zen Old Mincho", "Hiragino Mincho ProN", serif;
}

/* ========== Reset ========== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-feature-settings: "palt" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}
html {
  scroll-snap-type: y mandatory;
}
.hero,
.manifesto,
.roadmap,
.archive {
  scroll-snap-align: start;
  scroll-snap-stop: always;
}
.showcase {
  scroll-snap-align: end;
}
body {
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button {
  font: inherit; color: inherit; background: none;
  border: 0; cursor: pointer; letter-spacing: inherit;
}
img, svg { display: block; max-width: 100%; }

/* ========== Layout primitives ========== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 48px;
}
@media (max-width: 720px) {
  .container { padding: 0 24px; }
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.eyebrow .num {
  display: inline-block;
  width: 2.4em;
  color: var(--ink);
}

.serif { font-family: var(--font-serif); font-feature-settings: "palt" 0; letter-spacing: 0.04em; }

/* ========== Nav ========== */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 48px;
  z-index: 50;
  mix-blend-mode: difference;
  color: #f6f4ef;
  pointer-events: none;
  font-size: 12px;
  letter-spacing: 0.14em;
}
.nav > * { pointer-events: auto; }
.nav .brand {
  display: flex; align-items: baseline; gap: 10px;
  font-family: var(--font-mono);
}
.nav .brand .mark {
  display: inline-block; width: 10px; height: 10px;
  border: 1px solid currentColor;
  transform: rotate(45deg);
}
.nav .menu {
  display: flex; gap: 28px;
  font-family: var(--font-mono); font-size: 11px;
}
.nav .menu a { opacity: 0.85; transition: opacity 0.2s; }
.nav .menu a:hover { opacity: 1; }
@media (max-width: 720px) { .nav { padding: 14px 20px; } .nav .menu { display: none; } }

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  grid-template-rows: 1fr auto;
  padding: 96px 0 32px;
  isolation: isolate;
}
.hero-frame {
  position: absolute; inset: 0;
  pointer-events: none;
}
.hero-content {
  position: relative;
  align-self: center;
  padding: 0 48px;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  z-index: 2;
}
@media (max-width: 720px) { .hero-content { padding: 0 24px; } }

.hero-eyebrow {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 32px;
  opacity: 0; transform: translateY(8px);
  animation: fadeUp 0.9s var(--ease-out) 0.3s forwards;
}
.hero-eyebrow .line {
  width: 48px; height: 1px; background: var(--ink);
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(48px, 9vw, 132px);
  line-height: 0.96;
  letter-spacing: -0.02em;
  font-weight: 500;
  font-feature-settings: "palt" 0;
  margin-bottom: 36px;
}
.hero-title .row {
  display: block;
  overflow: hidden;
}
.hero-title .row span {
  display: inline-block;
  transform: translateY(110%);
  animation: rise 1.1s var(--ease-arc) forwards;
}
.hero-title .row:nth-child(2) span { animation-delay: 0.12s; }
.hero-title .row:nth-child(3) span { animation-delay: 0.24s; }
.hero-title .accent {
  display: inline-block;
  font-style: italic;
  font-size: 0.78em;
  vertical-align: 0.06em;
  color: var(--ink-soft);
}

.hero-lede {
  max-width: 540px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--ink-soft);
  opacity: 0; transform: translateY(8px);
  animation: fadeUp 1s var(--ease-out) 0.7s forwards;
}

.hero-meta {
  display: flex;
  justify-content: flex-start;
  gap: 64px;
  align-items: end;
  padding: 24px 48px 0;
  padding-right: 112px; /* clear .sec-nav on the right */
  border-top: 1px solid var(--rule);
  margin: 0 48px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-mute);
  z-index: 2;
  position: relative;
  opacity: 0;
  animation: fadeIn 0.8s var(--ease-out) 1s forwards;
}
.hero-meta .col { min-width: 0; }
.hero-meta .col span { display: block; color: var(--ink); margin-top: 4px; }
@media (max-width: 720px) {
  .hero-meta { padding: 16px 24px 0; margin: 0 24px; gap: 24px; padding-right: 64px; }
}

.hero-cue {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  margin-top: 56px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--ink-mute);
  opacity: 0;
  animation: fadeIn 0.8s var(--ease-out) 1.3s forwards;
}
.hero-cue .bar {
  display: block;
  width: 1px; height: 32px;
  background: var(--ink);
  transform-origin: top;
  animation: drop 1.6s var(--ease-arc) infinite;
}

.scroll-cue {
  display: flex; align-items: center; gap: 10px;
}
.scroll-cue .bar {
  width: 1px; height: 28px;
  background: var(--ink);
  transform-origin: top;
  animation: drop 1.6s var(--ease-arc) infinite;
}

/* ========== Manifesto ========== */
.manifesto {
  min-height: 100vh;
  padding: 120px 0 80px;
  position: relative;
  display: flex;
  align-items: center;
}
.manifesto > .container { width: 100%; }
.manifesto-grid {
  display: grid;
  grid-template-columns: 1fr 6fr 1fr;
  gap: 0;
  align-items: start;
}
.manifesto-side {
  position: sticky; top: 96px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-mute);
  writing-mode: vertical-rl;
}
.manifesto-side.right { justify-self: end; }

.manifesto-body {
  max-width: 720px;
  margin: 0 auto;
}
.manifesto-statement {
  font-family: var(--font-serif);
  font-size: clamp(24px, 3.2vw, 44px);
  line-height: 1.5;
  letter-spacing: 0.02em;
  font-feature-settings: "palt" 0;
}
.manifesto-statement .strike {
  position: relative;
  color: var(--ink-mute);
}
.manifesto-statement .strike::after {
  content: ""; position: absolute;
  left: 0; right: 0; top: 50%;
  height: 1px; background: var(--ink-mute);
  transform: scaleX(0); transform-origin: left;
  transition: transform 1.2s var(--ease-arc);
}
.manifesto-statement.in .strike::after { transform: scaleX(1); }
.manifesto-statement .em {
  color: var(--ink);
  position: relative;
}

.manifesto-supports {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
}
.manifesto-supports .item h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.manifesto-supports .item p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}
@media (max-width: 720px) {
  .manifesto-grid { grid-template-columns: 1fr; }
  .manifesto-side { display: none; }
  .manifesto-supports { grid-template-columns: 1fr; gap: 28px; }
}

/* ========== Roadmap ========== */
.roadmap {
  padding: 120px 0 0;
  background: var(--paper);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.roadmap:has(.roadmap-stack) { padding-bottom: 160px; }
.roadmap-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  margin-bottom: 80px;
  padding: 0 48px;
  max-width: 1280px;
  margin-left: auto; margin-right: auto;
}
.roadmap-head h2 {
  font-family: var(--font-serif);
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.15;
  letter-spacing: 0.02em;
  font-weight: 500;
  font-feature-settings: "palt" 0;
}
.roadmap-head p {
  align-self: end;
  font-size: 14px;
  line-height: 1.95;
  color: var(--ink-soft);
}
@media (max-width: 720px) {
  .roadmap-head { grid-template-columns: 1fr; padding: 0 24px; gap: 24px; }
}

/* Pinned horizontal scroll (rail layout) */
.roadmap-pin-wrap {
  position: relative;
}
.roadmap-snap {
  position: absolute;
  left: 0;
  width: 1px;
  height: 100vh;
  pointer-events: none;
  scroll-snap-align: start;
  scroll-snap-stop: always;
}
.roadmap-pin {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: var(--paper);
}
.roadmap-track {
  display: flex;
  flex: 1;
  min-height: 0;
  will-change: transform;
}
.roadmap-step {
  flex: 0 0 100vw;
  height: 100%;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 80px;
  padding: 56px clamp(48px, 6vw, 96px) 88px;
  position: relative;
  border-left: 1px solid var(--rule);
}
.roadmap-step:first-child { border-left-color: transparent; }
.roadmap-step .step-meta {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 28px;
  position: relative;
}
.roadmap-step .step-num {
  font-size: clamp(64px, 10vw, 160px);
  font-weight: 500;
  line-height: 0.9;
  color: var(--ink-mute);
  letter-spacing: 0;
  opacity: 0.35;
  transition: opacity 0.8s var(--ease-out), color 0.8s;
}
.roadmap-step.is-active .step-num { opacity: 1; color: var(--ink); }
.roadmap-step .step-en {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 18px;
}
.roadmap-step .step-title {
  font-size: clamp(72px, 11vw, 180px);
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 0.95;
  font-feature-settings: "palt" 0;
}
.roadmap-step .step-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 36px;
  max-width: 480px;
  align-self: center;
  opacity: 0.4;
  transition: opacity 0.8s var(--ease-out);
}
.roadmap-step.is-active .step-content { opacity: 1; }
.roadmap-step .step-body {
  font-size: 15px;
  line-height: 1.95;
  color: var(--ink-soft);
}
.roadmap-step .step-deliverables {
  list-style: none;
  border-top: 1px solid var(--rule);
  padding-top: 24px;
  display: grid;
  gap: 14px;
  font-size: 13px;
}
.roadmap-step .step-deliverables li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  font-family: var(--font-sans);
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}
.roadmap-step .step-deliverables li b {
  color: var(--ink-mute);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.18em;
  font-family: var(--font-mono);
  padding-top: 4px;
}
.roadmap-step .step-rule {
  position: absolute;
  left: clamp(48px, 6vw, 96px);
  right: clamp(48px, 6vw, 96px);
  bottom: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  pointer-events: none;
}
.roadmap-step .step-rule span {
  display: block;
  height: 1px;
  background: var(--rule);
  position: relative;
}
.roadmap-step .step-rule span::before {
  content: ""; position: absolute; left: 0; top: -3px;
  width: 1px; height: 7px; background: var(--rule);
}
.roadmap-step.is-active .step-rule span:first-child,
.roadmap-step.is-active .step-rule span:first-child::before { background: var(--ink); }

/* Progress bar inside pin */
.seg-bar {
  position: relative;
  height: 1px;
  background: var(--rule);
  margin-top: -1px;
}
.seg-bar span {
  position: absolute; inset: 0;
  background: var(--ink);
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 0.4s var(--ease-out);
}

@media (max-width: 720px) {
  .roadmap-step {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px 24px 64px;
  }
  .roadmap-step .step-title { font-size: clamp(48px, 16vw, 96px); }
  .roadmap-step .step-content { max-width: none; }
}

/* Stack layout (alternative roadmap) */
.roadmap-stack {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 48px;
  display: grid;
  gap: 0;
}
.roadmap-stack .stack-row {
  display: grid;
  grid-template-columns: 80px 1fr 1.4fr;
  gap: 48px;
  padding: 56px 0;
  border-top: 1px solid var(--rule);
  align-items: start;
  position: relative;
}
.roadmap-stack .stack-row:last-child { border-bottom: 1px solid var(--rule); }
.roadmap-stack .stack-row .num {
  font-family: var(--font-serif);
  font-size: 28px;
  color: var(--ink-mute);
}
.roadmap-stack .stack-row .label .ja {
  font-family: var(--font-serif);
  font-size: clamp(36px, 4.6vw, 64px);
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1;
  display: block;
  margin-bottom: 12px;
}
.roadmap-stack .stack-row .label .en {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-mute);
  text-transform: uppercase;
}
.roadmap-stack .stack-row .desc {
  font-size: 14px;
  line-height: 1.95;
  color: var(--ink-soft);
}
.roadmap-stack .stack-row .desc ul {
  list-style: none;
  margin-top: 20px;
  display: grid; gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-mute);
}
.roadmap-stack .stack-row .desc ul li::before {
  content: "—  "; color: var(--ink-mute);
}
@media (max-width: 720px) {
  .roadmap-stack .stack-row { grid-template-columns: 1fr; gap: 16px; }
  .roadmap-stack { padding: 0 24px; }
}

/* Progress strip */
.roadmap-progress {
  display: flex;
  gap: 0;
  padding: 28px clamp(48px, 6vw, 96px) 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  position: relative;
}
.roadmap-progress .seg {
  flex: 1;
  border-top: 1px solid var(--rule);
  padding: 14px 0 18px;
  display: flex; justify-content: space-between;
  transition: border-color 0.4s, color 0.4s;
  text-align: left;
}
.roadmap-progress .seg.active {
  border-top-color: var(--ink);
  color: var(--ink);
}

/* ========== Archive ========== */
.archive {
  padding: 160px 0 200px;
}
.archive-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: end;
  margin-bottom: 64px;
}
.archive-head h2 {
  font-family: var(--font-serif);
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.15;
  font-weight: 500;
  font-feature-settings: "palt" 0;
  letter-spacing: 0.02em;
}
.archive-head p {
  font-size: 14px;
  line-height: 1.95;
  color: var(--ink-soft);
  max-width: 460px;
  justify-self: end;
}
@media (max-width: 720px) {
  .archive-head { grid-template-columns: 1fr; gap: 16px; }
  .archive-head p { justify-self: start; }
}
.archive-filter {
  display: flex;
  align-items: center;
  gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 0;
  margin-bottom: 0;
}
.archive-filter .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  padding: 18px 24px 18px 0;
  border-right: 1px solid var(--rule);
}
.archive-filter .chips {
  display: flex; flex: 1;
}
.archive-filter .chip {
  padding: 18px 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-mute);
  border-right: 1px solid var(--rule);
  display: flex; align-items: center; gap: 10px;
  transition: color 0.3s, background 0.3s;
  position: relative;
}
.archive-filter .chip:hover { color: var(--ink); }
.archive-filter .chip.active {
  color: var(--ink);
  background: var(--bg);
}
.archive-filter .chip .count {
  font-size: 10px;
  color: var(--ink-mute);
}
.archive-filter .chip .dot {
  width: 6px; height: 6px;
  border: 1px solid currentColor;
  border-radius: 50%;
}
.archive-filter .chip.active .dot { background: currentColor; }

.archive-list {
  list-style: none;
}
.archive-row {
  display: grid;
  grid-template-columns: 80px 80px 1fr 140px 60px;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
  align-items: center;
  position: relative;
  cursor: pointer;
  transition: background 0.3s, padding 0.4s var(--ease-out);
}
.archive-row:hover {
  padding-left: 16px; padding-right: 16px;
  background: var(--paper);
}
.archive-row.dim { opacity: 0.22; }
.archive-row .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-mute);
}
.archive-row .date {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
}
.archive-row .title {
  font-family: var(--font-serif);
  font-size: clamp(20px, 1.8vw, 28px);
  letter-spacing: 0.04em;
  line-height: 1.4;
  font-feature-settings: "palt" 0;
}
.archive-row .title small {
  display: block;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  margin-top: 6px;
  font-weight: 400;
}
.archive-row .axis {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  display: flex; align-items: center; gap: 8px;
}
.archive-row .axis .pip {
  width: 8px; height: 8px;
  border: 1px solid var(--ink);
}
.archive-row[data-axis="accumulate"] .axis .pip { background: transparent; }
.archive-row[data-axis="standardize"] .axis .pip {
  background: linear-gradient(to right, var(--ink) 50%, transparent 50%);
}
.archive-row[data-axis="automate"] .axis .pip { background: var(--ink); }
.archive-row .arrow {
  font-family: var(--font-mono);
  text-align: right;
  color: var(--ink-mute);
  transition: transform 0.4s var(--ease-out), color 0.3s;
}
.archive-row:hover .arrow { transform: translateX(8px); color: var(--ink); }

@media (max-width: 720px) {
  .archive-row { grid-template-columns: 50px 1fr; gap: 12px; padding: 20px 0; }
  .archive-row .date, .archive-row .axis, .archive-row .arrow { display: none; }
}

/* ========== Showcase / Footer ========== */
.showcase {
  border-top: 1px solid var(--rule);
  padding: 96px 0 48px;
  background: var(--bg);
}
.showcase-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 64px;
  align-items: end;
  margin-bottom: 80px;
}
.showcase-by {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-mute);
  margin-bottom: 24px;
  text-transform: uppercase;
}
.showcase h3 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.4;
  font-weight: 500;
  letter-spacing: 0.04em;
  font-feature-settings: "palt" 0;
  max-width: 640px;
}
.showcase p {
  font-size: 14px;
  line-height: 1.95;
  color: var(--ink-soft);
  margin-top: 24px;
  max-width: 540px;
}
.showcase .cta {
  display: inline-flex; align-items: center; gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transition: gap 0.3s var(--ease-out);
}
.showcase .cta:hover { gap: 32px; }

.showcase-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-mute);
}
.showcase-meta dt { margin-bottom: 6px; text-transform: uppercase; }
.showcase-meta dd { color: var(--ink); font-family: var(--font-sans); font-size: 13px; letter-spacing: 0.04em; }

@media (max-width: 720px) {
  .showcase-grid { grid-template-columns: 1fr; gap: 32px; }
  .showcase-meta { grid-template-columns: 1fr 1fr; gap: 20px; }
}

/* ========== Section navigation control ========== */
.sec-nav {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 45;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--ink-mute);
}
.sec-nav .group {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border: 1px solid var(--rule);
}
.sec-nav button {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--rule);
  transition: background 0.2s, color 0.2s;
  position: relative;
}
.sec-nav button:last-child { border-bottom: 0; }
.sec-nav button:hover { background: var(--paper); color: var(--ink); }
.sec-nav button:disabled { opacity: 0.3; cursor: default; }
.sec-nav button:disabled:hover { background: transparent; color: var(--ink-mute); }
.sec-nav .glyph {
  display: block;
  width: 12px; height: 12px;
}
.sec-nav .glyph svg { width: 100%; height: 100%; stroke: currentColor; fill: none; stroke-width: 1.2; }
.sec-nav .index {
  text-align: center;
  padding: 8px 0;
  border: 1px solid var(--rule);
  background: var(--bg);
  color: var(--ink);
  letter-spacing: 0.2em;
  font-size: 10px;
  line-height: 1;
}
.sec-nav .index small {
  display: block;
  margin-top: 4px;
  color: var(--ink-mute);
  font-size: 9px;
  letter-spacing: 0.18em;
}
.sec-nav .label {
  position: absolute;
  right: 100%;
  top: 50%;
  transform: translate(-12px, -50%);
  background: var(--ink);
  color: var(--bg);
  padding: 6px 10px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}
.sec-nav button:hover .label { opacity: 1; }

@media (max-width: 720px) {
  .sec-nav { right: 12px; }
  .sec-nav button { width: 38px; height: 38px; }
}
@keyframes fadeIn { to { opacity: 1; } }
@keyframes fadeUp { to { opacity: 1; transform: none; } }
@keyframes rise { to { transform: translateY(0); } }
@keyframes drop {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}
@keyframes drawLine {
  to { stroke-dashoffset: 0; }
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 1.1s var(--ease-out), transform 1.1s var(--ease-out);
  transition-delay: var(--delay, 0s);
}
.reveal.in {
  opacity: 1; transform: none;
}

/* Hero blueprint variants */
.bp { stroke: var(--ink); fill: none; stroke-width: 1; vector-effect: non-scaling-stroke; }
.bp.faint { stroke: var(--rule); }
.bp.dim { stroke: var(--ink-mute); }
.bp-text {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  fill: var(--ink-mute);
  text-transform: uppercase;
}
.bp-jp {
  font-family: var(--font-serif);
  font-size: 18px;
  fill: var(--ink);
  letter-spacing: 0.08em;
}
.bp .draw {
  stroke-dasharray: var(--len, 1000);
  stroke-dashoffset: var(--len, 1000);
  animation: drawLine 2.4s var(--ease-arc) forwards;
  animation-delay: var(--d, 0s);
}

/* In-tweak hero variant: stratification */
.hero-strata-row {
  transform: translateX(-100%);
  animation: slideIn 1.4s var(--ease-arc) forwards;
  animation-delay: var(--d, 0s);
}
@keyframes slideIn { to { transform: translateX(0); } }

/* Tweaks button hint */
.tweaks-hint {
  position: fixed;
  right: 24px; bottom: 24px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  background: var(--bg);
  border: 1px solid var(--rule);
  padding: 8px 12px;
  z-index: 40;
  pointer-events: none;
  opacity: 0.8;
}