/* 逆サイボーグ — GROBYC
   色は :root のトークンで管理。bio = 生体（赤）、machine = 機械（青緑） */

:root {
  --bg: #0c0a0a;
  --bg-2: #141111;
  --bg-3: #1b1717;
  --fg: #efebe6;
  --fg-2: #b9b2ac;
  --muted: #847c77;
  --line: #2a2524;
  --line-2: #3d3634;
  --bio: #e24215;
  --bio-soft: rgba(226, 66, 21, .14);
  --machine: #5fa8c4;
  --machine-soft: rgba(95, 168, 196, .13);
  --on-machine: #071016;
  --none: #4a4341;

  --serif: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "Noto Sans JP", "Hiragino Sans", system-ui, sans-serif;
  --latin: "Jost", "Futura", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;

  --max: 1120px;
  --gut: clamp(16px, 5vw, 48px);
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f3f0eb;
    --bg-2: #ebe7e1;
    --bg-3: #e2ddd6;
    --fg: #141010;
    --fg-2: #3f3937;
    --muted: #7a726d;
    --line: #d6d0c9;
    --line-2: #bfb7af;
    --bio: #c8360f;
    --bio-soft: rgba(200, 54, 15, .1);
    --machine: #24708e;
    --machine-soft: rgba(36, 112, 142, .1);
    --on-machine: #ffffff;
    --none: #b3aaa3;
    color-scheme: light;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; }
strong { color: var(--fg); font-weight: 700; background: linear-gradient(transparent 62%, var(--bio-soft) 62%); }
h1, h2, h3 { margin: 0; font-weight: 700; }
p { margin: 0; }
::selection { background: var(--bio); color: #fff; }

/* ---------- top bar ---------- */
.topbar {
  position: fixed; inset: 0 0 auto 0; z-index: 10;
  display: flex; align-items: center; gap: 24px;
  height: 60px; padding: 0 var(--gut);
  transition: background .3s, border-color .3s;
  border-bottom: 1px solid transparent;
}
.topbar.solid {
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--line);
}
.brand {
  font-family: var(--latin); font-weight: 500; letter-spacing: .32em;
  font-size: 13px; text-decoration: none; flex: none;
}
.nav {
  display: flex; gap: 4px; margin-left: auto;
  overflow-x: auto; scrollbar-width: none; min-width: 0;
  mask-image: linear-gradient(90deg, transparent, #000 12px, #000 calc(100% - 12px), transparent);
  padding: 0 12px;
}
.nav::-webkit-scrollbar { display: none; }
.nav a {
  flex: none; font-size: 13px; text-decoration: none; color: var(--muted);
  padding: 6px 10px; border-radius: 99px; transition: color .2s, background .2s;
}
.nav a:hover { color: var(--fg); }
.nav a.on { color: var(--fg); background: var(--bg-3); }

/* ---------- hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: grid; place-items: center;
  padding: 96px var(--gut) 80px;
  overflow: hidden; isolation: isolate;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 56px 56px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 56px 56px;
  opacity: .45;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, #000 20%, transparent 75%);
}
.hero::after {
  content: ""; position: absolute; z-index: -1;
  width: min(70vw, 620px); aspect-ratio: 1; border-radius: 50%;
  left: 50%; top: 50%; translate: -50% -52%;
  background: linear-gradient(90deg, var(--machine) 50%, var(--bio) 50%);
  filter: blur(90px); opacity: .22;
}
.hero-inner { text-align: center; max-width: 820px; }
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: .3em;
  text-transform: uppercase; color: var(--muted);
}
.word {
  --w: .74em;
  display: flex; justify-content: center;
  font-family: var(--latin); font-weight: 300;
  font-size: clamp(56px, 16vw, 200px); line-height: 1.05;
  margin: 18px 0 8px; cursor: pointer; user-select: none;
}
.word span {
  display: inline-block; width: var(--w); text-align: center;
  transition: transform 1.3s cubic-bezier(.75, 0, .2, 1), color 1.3s;
  transition-delay: calc(var(--i) * 45ms);
}
.word.is-rev span {
  transform: translateX(calc((var(--n) - 1 - 2 * var(--i)) * var(--w)));
}
.word.is-rev span:nth-child(-n + 3) { color: var(--bio); }
.word.no-anim span { transition: none; }
.hero-title {
  font-family: var(--serif); font-weight: 800;
  font-size: clamp(28px, 5vw, 48px); letter-spacing: .14em;
}
.hero-lead {
  margin: 24px auto 0; max-width: 34em; color: var(--fg-2);
  font-size: clamp(15px, 1.8vw, 17px);
}
.scroll {
  position: absolute; bottom: 28px; left: 50%; translate: -50% 0;
  display: grid; justify-items: center; gap: 10px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .3em;
  text-transform: uppercase; color: var(--muted); text-decoration: none;
}
.scroll i { width: 1px; height: 40px; background: linear-gradient(var(--muted), transparent); animation: drip 2.2s ease-in-out infinite; transform-origin: top; }
@keyframes drip { 0% { transform: scaleY(0); } 50% { transform: scaleY(1); } 100% { transform: scaleY(1); opacity: 0; } }

/* ---------- sections ---------- */
.section {
  max-width: var(--max); margin: 0 auto;
  padding: clamp(72px, 12vw, 140px) var(--gut) 0;
}
.sec-head { margin-bottom: clamp(28px, 4vw, 48px); }
.sec-num {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--mono); font-size: 12px; letter-spacing: .24em;
  text-transform: uppercase; color: var(--muted);
}
.sec-num span { color: var(--bio); }
.sec-num::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.sec-title {
  margin-top: 12px;
  font-family: var(--serif); font-weight: 800;
  font-size: clamp(28px, 4.4vw, 44px); line-height: 1.4; letter-spacing: .06em;
}
.lead { color: var(--fg-2); max-width: 40em; margin-bottom: 36px; }
.body-lg { font-size: clamp(17px, 2vw, 19px); line-height: 2; margin-bottom: 20px; }

.points { list-style: none; margin: 0; padding: 0; }
.points li { position: relative; padding-left: 1.3em; color: var(--fg-2); }
.points li + li { margin-top: .35em; }
.points li::before {
  content: ""; position: absolute; left: 0; top: .9em;
  width: .5em; height: 1px; background: var(--muted);
}

/* reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- definition ---------- */
.def-grid {
  display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(32px, 5vw, 64px); align-items: center;
}
.matrix { position: relative; display: grid; gap: 8px; }
.mx-row { display: grid; grid-template-columns: 64px 1fr 1fr; gap: 8px; }
.mx-headrow span { font-size: 13px; color: var(--muted); text-align: center; padding-bottom: 4px; }
.mx-col.is-rev { color: var(--fg); font-weight: 700; }
.mx-label {
  display: grid; align-content: center; font-family: var(--serif); font-weight: 700; font-size: 17px;
}
.mx-label small { font-family: var(--mono); font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--muted); font-weight: 400; }
.cell {
  display: grid; place-items: center; min-height: 112px; border-radius: 10px;
  border: 1px solid; position: relative; overflow: hidden;
}
.cell b { font-family: var(--serif); font-size: 20px; letter-spacing: .2em; }
.cell-bio { color: var(--bio); border-color: color-mix(in srgb, var(--bio) 45%, transparent); background: var(--bio-soft); }
.cell-machine {
  color: var(--machine); border-color: color-mix(in srgb, var(--machine) 45%, transparent);
  background:
    repeating-linear-gradient(0deg, transparent 0 11px, color-mix(in srgb, var(--machine) 18%, transparent) 11px 12px),
    repeating-linear-gradient(90deg, transparent 0 11px, color-mix(in srgb, var(--machine) 18%, transparent) 11px 12px),
    var(--machine-soft);
}
.cell-bio::after {
  content: ""; position: absolute; width: 140%; aspect-ratio: 1; border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--bio) 22%, transparent), transparent 60%);
  animation: pulse 3.6s ease-in-out infinite;
}
@keyframes pulse { 50% { transform: scale(.7); opacity: .5; } }
.mx-row:not(.mx-headrow) .cell:last-child { box-shadow: 0 0 0 1px var(--fg) inset; }
.mx-swap {
  position: absolute; right: 0; left: 72px; bottom: -34px;
  text-align: center; color: var(--muted); font-size: 18px;
}

.relatives { margin-top: clamp(56px, 8vw, 88px); padding-top: 32px; border-top: 1px solid var(--line); }
.note { color: var(--muted); font-size: 14px; max-width: 48em; }
.rel-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 24px; }
.rel { padding: 20px; background: var(--bg-2); border-radius: 10px; }
.rel h3 { font-family: var(--serif); font-size: 17px; display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 10px; }
.rel h3 small { font-family: var(--sans); font-size: 12px; color: var(--muted); font-weight: 400; }
.rel p { margin-top: 10px; font-size: 14px; line-height: 1.8; color: var(--fg-2); }

/* ---------- purpose ---------- */
.purpose { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 64px); }
.purpose p { color: var(--fg-2); }
.purpose blockquote {
  margin: 0; padding: 4px 0 4px 24px; border-left: 2px solid var(--bio);
  font-family: var(--serif); font-weight: 700; font-size: clamp(18px, 2.2vw, 21px); line-height: 1.95;
}

/* ---------- origin ---------- */
.chain {
  list-style: none; margin: 0 0 48px; padding: 0;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
}
.chain li + li { border-left: 1px solid var(--line); }
.chain a {
  display: grid; gap: 4px; padding: 22px 24px; text-decoration: none; height: 100%;
  position: relative; transition: background .2s;
}
.chain a:hover { background: var(--bg-2); }
.chain li:not(:last-child) a::after {
  content: "→"; position: absolute; right: -9px; top: 50%; translate: 0 -50%; z-index: 1;
  width: 18px; height: 18px; display: grid; place-items: center;
  background: var(--bg); color: var(--muted); font-size: 12px;
}
.chain-n { font-family: var(--mono); font-size: 12px; color: var(--bio); }
.chain b { font-family: var(--serif); font-size: 20px; }
.chain small { color: var(--muted); font-size: 13px; line-height: 1.7; }
.chain li:last-child b { color: var(--bio); }

.chapters { display: grid; gap: 20px; }
.chapter {
  display: grid; grid-template-columns: 200px 1fr; gap: 32px;
  padding: clamp(24px, 4vw, 40px); background: var(--bg-2); border-radius: 14px;
}
.chapter > header { position: sticky; top: 84px; align-self: start; }
.chapter > header span { font-family: var(--mono); font-size: 12px; letter-spacing: .2em; color: var(--muted); }
.chapter > header h3 { font-family: var(--serif); font-size: 26px; margin-top: 4px; }
.ch-body { display: grid; gap: 18px; min-width: 0; }
.voice {
  font-family: var(--serif); font-weight: 700; font-size: 17px; line-height: 1.8;
  display: flex; gap: 12px; align-items: baseline;
}
.voice .who {
  flex: none; font-family: var(--sans); font-size: 11px; font-weight: 500;
  width: 24px; height: 24px; border-radius: 50%; display: inline-grid; place-items: center;
  background: var(--fg); color: var(--bg); translate: 0 -2px;
}
.define { border: 1px dashed var(--line-2); border-radius: 10px; padding: 16px 20px; }
.define span { font-size: 12px; color: var(--bio); font-weight: 700; letter-spacing: .1em; }
.define p { margin-top: 4px; font-family: var(--serif); font-weight: 700; font-size: 17px; }
.conclusion {
  margin-top: 8px; padding: 22px 24px; border-radius: 10px;
  background: var(--bio); color: #fff;
  font-family: var(--serif); font-weight: 800; font-size: clamp(18px, 2.4vw, 22px); line-height: 1.7;
}

/* magic table */
.magic { border: 1px solid var(--line-2); border-radius: 12px; overflow: hidden; font-size: 14px; }
.mg-row { display: grid; grid-template-columns: 1.25fr 1fr 1fr; }
.mg-row > span { padding: 14px 16px; line-height: 1.7; }
.mg-row > span + span { border-left: 1px solid var(--line); }
.mg-row + .mg-row { border-top: 1px solid var(--line); }
.mg-head { background: var(--bg-3); font-size: 12px; color: var(--muted); }
.mg-el b { display: block; font-family: var(--serif); font-size: 16px; }
.mg-el small { color: var(--muted); font-size: 12.5px; }
.mg-lost { color: var(--fg-2); }
.mg-rev { color: var(--fg-2); }
.mg-rev b { font-weight: 500; }
.is-key .mg-rev { position: relative; background: var(--bio-soft); }
.is-key .mg-rev b { font-weight: 800; font-family: var(--serif); font-size: 20px; color: var(--bio); }
.mg-rev .blank {
  font-style: normal; color: var(--muted); margin-right: 10px; text-decoration: line-through;
}

/* ---------- technology ---------- */
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tech {
  position: relative; padding: 24px; border: 1px solid var(--line); border-radius: 12px;
  display: flex; flex-direction: column; gap: 8px;
}
.tech-en { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.tech h3 { font-family: var(--serif); font-size: 20px; }
.tech p:not(.tech-en):not(.role) { font-size: 14px; color: var(--fg-2); line-height: 1.8; }
.tech .role {
  margin-top: auto; padding-top: 12px; font-size: 12px; font-weight: 700; color: var(--bio);
  display: flex; align-items: center; gap: 8px;
}
.tech .role::before { content: ""; width: 14px; height: 1px; background: currentColor; }
.tech.has-role { border-color: color-mix(in srgb, var(--bio) 40%, var(--line)); }

/* ---------- levels ---------- */
.legend { display: flex; flex-wrap: wrap; gap: 18px; margin: -12px 0 28px; font-size: 13px; color: var(--fg-2); }
.lg { display: inline-flex; align-items: center; gap: 8px; }
.lg::before { content: ""; width: 14px; height: 14px; border-radius: 3px; }
.lg-bio::before { background: var(--bio); }
.lg-machine::before { background: var(--machine); }
.lg-none::before { border: 1px dashed var(--none); }

.ladder { display: grid; gap: 14px; position: relative; }
.lv-branch { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.level {
  display: grid; grid-template-columns: 96px 1fr; gap: 20px;
  padding: 22px 24px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg);
}
.lv { font-family: var(--mono); font-size: 13px; color: var(--muted); line-height: 1.1; }
.lv b { display: block; font-family: var(--latin); font-weight: 300; font-size: 44px; color: var(--fg); margin-top: 4px; }
.lv-body h3 { font-family: var(--serif); font-size: 18px; line-height: 1.6; }
.lv-body .points li { font-size: 14px; }
.bar { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; margin: 12px 0 14px; }
.seg {
  display: flex; justify-content: space-between; align-items: center; gap: 6px;
  padding: 6px 10px; border-radius: 6px; font-size: 12px; line-height: 1.4;
}
.seg i { font-style: normal; opacity: .75; }
.seg b { font-weight: 700; }
.seg-bio { background: var(--bio); color: #fff; }
.seg-machine { background: var(--machine); color: var(--on-machine); }
.seg-none { border: 1px dashed var(--none); color: var(--muted); }
.level.is-final { border-color: var(--bio); background: linear-gradient(135deg, var(--bio-soft), transparent 60%); }
.level.is-final .lv b { color: var(--bio); }

/* ---------- experiments ---------- */
.exp-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.exp {
  display: flex; flex-direction: column; gap: 14px;
  padding: clamp(22px, 3vw, 32px); background: var(--bg-2); border-radius: 14px;
}
.exp-n { font-family: var(--mono); font-size: 12px; color: var(--bio); letter-spacing: .14em; }
.exp h3 { font-family: var(--serif); font-size: clamp(19px, 2.2vw, 22px); line-height: 1.6; }
.exp .points li { font-size: 14.5px; }
.answer {
  margin-top: auto; padding-top: 16px; border-top: 1px solid var(--line);
  font-family: var(--serif); font-weight: 700; font-size: 17px; display: flex; gap: 10px;
}
.answer span { font-family: var(--mono); font-weight: 500; color: var(--bio); }

.more { margin-top: 48px; }
.more h3 { font-family: var(--serif); font-size: 20px; margin-bottom: 12px; }
.more details { border-top: 1px solid var(--line); }
.more details:last-child { border-bottom: 1px solid var(--line); }
.more summary {
  cursor: pointer; list-style: none; padding: 16px 4px;
  display: flex; align-items: center; gap: 12px; font-weight: 500;
}
.more summary::-webkit-details-marker { display: none; }
.more summary span {
  font-family: var(--mono); font-size: 11px; color: var(--muted);
  border: 1px solid var(--line-2); border-radius: 99px; padding: 0 8px;
}
.more summary::after { content: "+"; margin-left: auto; font-family: var(--mono); color: var(--muted); transition: transform .2s; }
.more details[open] summary::after { transform: rotate(45deg); }
.more details .points { padding: 0 4px 20px; }

/* ---------- thesis ---------- */
.versus { display: grid; grid-template-columns: 1fr auto 1fr; align-items: stretch; gap: 0; }
.vs { padding: clamp(28px, 4vw, 48px); border-radius: 14px; display: grid; gap: 6px; align-content: center; }
.vs small { font-family: var(--mono); font-size: 12px; letter-spacing: .24em; text-transform: uppercase; }
.vs b { font-family: var(--serif); font-size: clamp(40px, 7vw, 72px); line-height: 1.15; letter-spacing: .1em; }
.vs p { color: var(--fg-2); }
.vs-l { background: var(--machine-soft); color: var(--machine); text-align: right; }
.vs-r { background: var(--bio-soft); color: var(--bio); }
.vs-l p, .vs-r p { color: var(--fg-2); }
.vs-mid { display: grid; place-items: center; width: 0; position: relative; z-index: 1; }
.vs-mid span {
  font-family: var(--mono); font-size: 12px; color: var(--muted);
  width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center;
  background: var(--bg); border: 1px solid var(--line-2);
}
.question {
  margin-top: 40px; text-align: center;
  font-family: var(--serif); font-weight: 800; font-size: clamp(22px, 3.4vw, 32px); line-height: 1.6;
}
.closing { margin: 24px auto 0; max-width: 40em; color: var(--fg-2); text-align: center; }

/* ---------- footer ---------- */
.footer {
  max-width: var(--max); margin: clamp(96px, 14vw, 180px) auto 0;
  padding: 0 var(--gut) 40px; overflow: hidden;
}
.ft-word {
  font-family: var(--latin); font-weight: 300; font-size: clamp(64px, 21vw, 260px);
  line-height: .9; letter-spacing: .02em; color: var(--bg-3); text-align: center;
  margin-bottom: 24px; white-space: nowrap;
}
.ft-row {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px;
  padding-top: 20px; border-top: 1px solid var(--line); font-size: 14px;
}
.ft-row a { color: var(--fg-2); text-decoration: none; }
.ft-row a:hover { color: var(--bio); }
.ft-note { margin-top: 10px; font-size: 12px; color: var(--muted); }
.noscript { padding: 120px 24px; text-align: center; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .rel-grid { grid-template-columns: 1fr 1fr; }
  .tech-grid { grid-template-columns: 1fr 1fr; }
  .chapter { grid-template-columns: 1fr; gap: 20px; }
  .chapter > header { position: static; }
}
@media (max-width: 760px) {
  body { font-size: 15px; }
  .brand { letter-spacing: .2em; }
  .def-grid, .purpose, .exp-grid, .lv-branch { grid-template-columns: 1fr; }
  .chain { grid-template-columns: 1fr; }
  .chain li + li { border-left: 0; border-top: 1px solid var(--line); }
  .chain li:not(:last-child) a::after { content: "↓"; right: auto; left: 24px; top: auto; bottom: -9px; translate: 0 0; }
  .rel-grid, .tech-grid { grid-template-columns: 1fr; }
  .cell { min-height: 88px; }
  .level { grid-template-columns: 1fr; gap: 6px; padding: 20px; }
  .lv { display: flex; align-items: baseline; gap: 6px; }
  .lv b { display: inline; font-size: 32px; margin: 0; }

  /* 魔術の表はカード状に */
  .mg-head { display: none; }
  .mg-row { grid-template-columns: 1fr; }
  .mg-row > span + span { border-left: 0; border-top: 1px dashed var(--line); }
  .mg-lost::before, .mg-rev::before {
    content: attr(data-k); display: block; font-size: 11px; color: var(--muted); letter-spacing: .06em;
  }

  .versus { grid-template-columns: 1fr; }
  .vs-l { text-align: left; }
  .vs-mid { width: auto; height: 0; }
  .voice { font-size: 16px; }
}
@media (max-width: 420px) {
  .nav a { padding: 6px 8px; }
  .seg { flex-direction: column; align-items: flex-start; gap: 0; padding: 6px 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .cell-bio::after, .scroll i { animation: none; }
}