:root {
  --bg: #f6f5f1;
  --bg-alt: #eceae3;
  --surface: #ffffff;
  --ink: #12151c;
  --muted: #5d6270;
  --line: #d9d6cc;
  --a1: #4f5dff;
  --a2: #0fa89a;
  --human: #d9612b;
  --on-accent: #ffffff;
  --shadow: 0 1px 2px rgba(18, 21, 28, .06), 0 8px 24px rgba(18, 21, 28, .06);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0d12;
    --bg-alt: #11141b;
    --surface: #161a23;
    --ink: #e9ebf1;
    --muted: #9aa0ad;
    --line: #262b36;
    --a1: #7c8cff;
    --a2: #3fd8c6;
    --human: #ff8a55;
    --on-accent: #0b0d12;
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  --bg: #0b0d12; --bg-alt: #11141b; --surface: #161a23; --ink: #e9ebf1; --muted: #9aa0ad;
  --line: #262b36; --a1: #7c8cff; --a2: #3fd8c6; --human: #ff8a55; --on-accent: #0b0d12; --shadow: none;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Zen Kaku Gothic New", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: .02em;
  overflow-x: hidden;
}
a { color: inherit; }
h1, h2, h3 { line-height: 1.4; letter-spacing: .03em; margin: 0; }
p { margin: 0 0 1em; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 720px; }
.note { color: var(--muted); font-size: 13px; line-height: 1.7; }
.center { text-align: center; }
br.pc { display: none; }
@media (min-width: 760px) { .wrap { padding: 0 32px; } br.pc { display: inline; } }

/* ヘッダー */
.bar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
}
.bar-in { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-family: "Space Grotesk", sans-serif; font-weight: 600; letter-spacing: .22em; text-decoration: none; font-size: 15px; }
.bar nav { display: flex; align-items: center; gap: 4px; }
.bar nav a { text-decoration: none; font-size: 13px; color: var(--muted); padding: 6px 10px; border-radius: 999px; }
.bar nav a:hover { color: var(--ink); }
.bar nav .nav-cta { color: var(--ink); border: 1px solid var(--line); }
@media (max-width: 600px) { .bar nav a:not(.nav-cta) { display: none; } }

/* ボタン */
.btn {
  display: inline-block; text-decoration: none; font-weight: 700; font-size: 15px;
  padding: 13px 24px; border-radius: 999px;
  background: linear-gradient(120deg, var(--a1), var(--a2));
  color: var(--on-accent);
  transition: transform .2s, box-shadow .2s;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 8px 24px color-mix(in srgb, var(--a1) 35%, transparent); }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn.ghost:hover { box-shadow: none; border-color: var(--ink); }
.btn.big { font-size: 17px; padding: 16px 32px; margin: 8px 0 20px; }
.btn:focus-visible, .tabs button:focus-visible, a:focus-visible { outline: 2px solid var(--a1); outline-offset: 3px; }

/* 冒頭 */
.hero { position: relative; min-height: min(92vh, 860px); display: flex; flex-direction: column; justify-content: center; overflow: hidden; }
#mobius { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-in { position: relative; width: 100%; padding-top: 40px; padding-bottom: 40px; }
.eyebrow { font-family: "Space Grotesk", sans-serif; font-size: 13px; letter-spacing: .28em; color: var(--muted); text-transform: uppercase; }
.hero h1 { font-size: clamp(34px, 7.4vw, 76px); font-weight: 700; letter-spacing: .04em; margin: 12px 0 24px; }
.hero-lead { font-size: clamp(15px, 1.9vw, 18px); color: var(--muted); max-width: 40em; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-note { position: relative; font-size: 12px; color: var(--muted); margin: 0 auto 24px; width: 100%; }
@media (max-width: 759px) {
  .hero { min-height: 88vh; justify-content: flex-end; }
  .hero-in { padding-bottom: 12px; }
}

/* セクション共通 */
.block { padding: 96px 0; }
.block.alt { background: var(--bg-alt); }
@media (max-width: 759px) { .block { padding: 64px 0; } }
.kicker { font-family: "Space Grotesk", sans-serif; font-size: 12px; letter-spacing: .2em; color: var(--muted); margin-bottom: 14px; }
.block h2 { font-size: clamp(24px, 4vw, 38px); margin-bottom: 24px; }
.center-head { text-align: center; max-width: 720px; margin: 0 auto 40px; }
.center-head p:not(.kicker) { color: var(--muted); }
.em { font-weight: 700; font-size: 18px; border-left: 3px solid var(--a1); padding-left: 14px; margin-top: 24px; }
strong { background: linear-gradient(transparent 62%, color-mix(in srgb, var(--a2) 28%, transparent) 62%); font-weight: 700; }

.two { display: grid; gap: 48px; align-items: center; }
@media (min-width: 900px) { .two { grid-template-columns: 1.1fr 1fr; gap: 64px; } }

/* 伸び方の図 */
.scale { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 24px; box-shadow: var(--shadow); }
.scale-head { display: flex; justify-content: space-between; align-items: baseline; font-size: 14px; color: var(--muted); }
.scale-head output { font-family: "Space Grotesk", sans-serif; font-size: 22px; color: var(--ink); font-weight: 600; }
.scale input[type=range] { width: 100%; margin: 12px 0 8px; accent-color: var(--a1); }
#scale-svg { width: 100%; height: auto; display: block; overflow: visible; }
.axis { stroke: var(--line); stroke-width: 1.5; }
.ax-label { fill: var(--muted); font-size: 11px; }
.l-hand, .l-loop { fill: none; stroke-width: 3; stroke-linecap: round; }
.l-hand { stroke: var(--human); }
.l-loop { stroke: var(--a1); }
.l-cost { fill: none; stroke: var(--a2); stroke-width: 2; stroke-dasharray: 5 5; }
.d-cost { fill: var(--a2); }
.k-cost { background: var(--a2); }
.cursor { stroke: var(--muted); stroke-dasharray: 3 4; stroke-width: 1; }
.d-hand { fill: var(--human); }
.d-loop { fill: var(--a1); }
.legend { display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: 14px; margin: 12px 0 8px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; vertical-align: 0; }
.k-hand { background: var(--human); }
.k-loop { background: var(--a1); }

/* ループの解剖図 */
.tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 32px; }
.tabs button {
  font: inherit; font-size: 14px; font-weight: 500; cursor: pointer;
  padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--surface); color: var(--muted);
}
.tabs button[aria-selected="true"] { color: var(--ink); border-color: var(--ink); }
.live, .ex { font-size: 11px; margin-left: 8px; padding: 1px 8px; border-radius: 999px; vertical-align: 1px; }
.live { background: color-mix(in srgb, var(--a2) 18%, transparent); color: var(--a2); }
.ex { background: color-mix(in srgb, var(--muted) 15%, transparent); color: var(--muted); }

.anatomy { display: grid; gap: 32px; align-items: center; }
@media (min-width: 900px) { .anatomy { grid-template-columns: 420px 1fr; gap: 56px; } }
#ring { width: 100%; max-width: 420px; margin: 0 auto; display: block; }
.ring-track { fill: none; stroke: var(--line); stroke-width: 2; }
.ring-prog { fill: none; stroke: url(#g-ring); stroke-width: 4; stroke-linecap: round; transform: rotate(-90deg); transform-origin: 180px 180px; }
.ring-token { fill: var(--ink); }
.node circle { fill: var(--surface); stroke: var(--line); stroke-width: 2; transition: all .3s; cursor: pointer; }
.node text { fill: var(--muted); font-size: 12px; font-weight: 700; pointer-events: none; transition: fill .3s; }
.node.on circle { stroke: var(--a1); stroke-width: 3; fill: color-mix(in srgb, var(--a1) 12%, var(--surface)); }
.node.on.human circle { stroke: var(--human); fill: color-mix(in srgb, var(--human) 12%, var(--surface)); }
.node.on text { fill: var(--ink); }
.ring-center { fill: var(--ink); font-size: 22px; font-weight: 700; }
.ring-sub { fill: var(--muted); font-size: 12px; }

.stages { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.stages li {
  display: grid; grid-template-columns: auto 1fr; gap: 2px 14px; align-items: baseline;
  padding: 14px 18px; border-radius: 14px; border: 1px solid transparent; transition: all .35s; cursor: pointer;
}
.stages li p { grid-column: 2; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.stages li b { font-size: 16px; }
.stages li.on { background: var(--surface); border-color: var(--line); box-shadow: var(--shadow); }
.stages li.on p { color: var(--ink); }
.who { font-family: "Space Grotesk", sans-serif; font-size: 11px; font-weight: 600; width: 34px; text-align: center; border-radius: 6px; padding: 1px 0; grid-row: span 2; align-self: start; margin-top: 4px; }
.who.ai { color: var(--a1); background: color-mix(in srgb, var(--a1) 14%, transparent); }
.who.human { color: var(--human); background: color-mix(in srgb, var(--human) 14%, transparent); }

/* 考え方 */
.principles { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; border-top: 1px solid var(--line); }
.principles li { display: grid; grid-template-columns: 64px 1fr; gap: 4px 16px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.principles .num { font-family: "Space Grotesk", sans-serif; font-size: 14px; color: var(--a1); grid-row: span 2; padding-top: 4px; }
.principles h3 { font-size: 20px; }
.principles p { color: var(--muted); margin: 6px 0 0; }
@media (min-width: 900px) {
  .principles li { grid-template-columns: 120px 320px 1fr; align-items: baseline; }
  .principles .num { grid-row: auto; }
  .principles p { margin: 0; }
}

/* つくれるもの */
.cards { display: grid; gap: 16px; margin-bottom: 24px; }
@media (min-width: 900px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 28px 24px; display: flex; flex-direction: column; box-shadow: var(--shadow); }
.card-tag { font-size: 12px; color: var(--a1); font-weight: 700; margin-bottom: 8px; }
.card h3 { font-size: 20px; margin-bottom: 12px; }
.card h3 small { font-size: 14px; font-weight: 500; color: var(--muted); margin-left: 4px; white-space: nowrap; }
.card p { font-size: 15px; color: var(--muted); }
.card .price { margin-top: auto; margin-bottom: 0; padding-top: 16px; border-top: 1px dashed var(--line); color: var(--ink); font-size: 14px; font-weight: 500; }

/* 進め方 */
.flow { list-style: none; padding: 0; margin: 0 auto; max-width: 760px; counter-reset: f; position: relative; }
.flow::before { content: ""; position: absolute; left: 19px; top: 20px; bottom: 20px; width: 2px; background: linear-gradient(var(--a1), var(--a2)); opacity: .5; }
.flow li { counter-increment: f; position: relative; padding: 0 0 32px 64px; }
.flow li::before {
  content: counter(f); position: absolute; left: 0; top: 0; width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center; font-family: "Space Grotesk", sans-serif; font-weight: 600;
  background: var(--bg); border: 2px solid var(--a1); color: var(--a1);
}
.flow b { display: block; font-size: 18px; padding-top: 4px; }
.flow p { color: var(--muted); margin: 4px 0 0; }

/* 名前 */
.name { text-align: center; }
.name h2 { font-family: "Space Grotesk", sans-serif; font-size: clamp(28px, 6vw, 56px); letter-spacing: .12em; margin-bottom: 32px; }
.name .x { color: var(--muted); font-weight: 400; margin: 0 .4em; }
.name .word { background: linear-gradient(120deg, var(--a1), var(--a2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.name p { color: var(--muted); }
.name p b { color: var(--ink); }

/* 相談 */
.contact { background: var(--bg-alt); }
.hint { color: var(--muted); padding-left: 1.2em; margin: 0 0 24px; }
.hint li { margin: 4px 0; }

/* 事業者情報・プライバシーポリシー */
.doc { padding: 72px 0 96px; }
.doc h1 { font-size: clamp(26px, 4vw, 36px); margin-bottom: 32px; }
.doc h2 { font-size: 17px; margin: 36px 0 10px; }
.doc ul { padding-left: 1.2em; margin: 0 0 1em; }
.doc li { margin: 4px 0; }
.doc a { color: var(--a1); }
.info { margin: 0; border-top: 1px solid var(--line); }
.info div { display: flex; gap: 24px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.info dt { width: 6em; flex-shrink: 0; font-weight: 700; }
.info dd { margin: 0; }
@media (max-width: 520px) { .info div { flex-direction: column; gap: 2px; } }

/* フッター */
.foot { border-top: 1px solid var(--line); padding: 32px 0 48px; }
.foot-in { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; justify-content: space-between; }
.foot nav { display: flex; gap: 20px; }
.foot nav a, .foot small { color: var(--muted); font-size: 13px; }
.foot .logo { color: var(--ink); }

/* 現れる動き(JS があるときだけ) */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
}