:root {
  --ink: #20231f;
  --muted: #666b64;
  --paper: #f7f7f4;
  --white: #fff;
  --line: #d9ddd6;
  --soft: #eef1ec;
  --green: #315d4d;
  --green-soft: #e4eee9;
  --blue: #315f82;
  --blue-soft: #e7f0f5;
  --amber: #8a6326;
  --amber-soft: #f6eddc;
  --max: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  line-height: 1.85;
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button { font: inherit; }
.progress { position: fixed; inset: 0 0 auto; height: 3px; z-index: 100; }
.progress span { display: block; width: 0; height: 100%; background: var(--green); }

.site-header {
  position: sticky; top: 0; z-index: 90;
  display: flex; align-items: center; justify-content: space-between;
  min-height: 68px; padding: 0 4vw;
  border-bottom: 1px solid var(--line);
  background: rgba(247,247,244,.94); backdrop-filter: blur(12px);
}
.wordmark { display: flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 800; }
.wordmark small { margin-left: 6px; color: var(--muted); font-size: 11px; font-weight: 500; }
.wordmark-mark {
  display: grid; place-items: center; width: 32px; height: 32px;
  color: white; background: var(--green); font-family: "Yu Mincho", serif; font-size: 18px;
}
.site-nav { display: flex; gap: 22px; }
.site-nav a { color: var(--muted); font-size: 12px; font-weight: 700; text-decoration: none; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--green); }
.menu-button { display: none; padding: 6px 11px; border: 1px solid var(--line); background: white; }

.intro, .section { max-width: var(--max); margin: 0 auto; padding: 104px 5vw; }
.intro { padding-top: 11vh; padding-bottom: 12vh; }
.doc-meta { display: flex; flex-wrap: wrap; gap: 8px 22px; color: var(--muted); font-size: 11px; font-weight: 700; letter-spacing: .09em; }
.intro h1 { margin: 30px 0 25px; font-size: clamp(40px, 6vw, 76px); line-height: 1.24; letter-spacing: -.045em; }
.intro h1 em { color: var(--green); font-size: .53em; font-style: normal; font-weight: 600; letter-spacing: -.02em; }
.intro-lead { max-width: 790px; margin: 0; color: #434842; font-size: clamp(17px, 2vw, 22px); }
.notice { display: grid; grid-template-columns: 150px 1fr; gap: 28px; max-width: 900px; margin-top: 48px; padding: 24px 28px; border: 1px solid var(--line); background: white; }
.notice strong { color: var(--green); font-size: 13px; }
.notice p { margin: 0; font-size: 14px; }
.legend { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 26px; color: var(--muted); font-size: 12px; }
.legend span { display: flex; align-items: center; gap: 7px; }
.dot { width: 8px; height: 8px; border-radius: 50%; }
.dot.decided { background: var(--green); } .dot.hypothesis { background: var(--blue); } .dot.pending { background: var(--amber); }

.section { border-top: 1px solid var(--line); }
.section-title { display: flex; align-items: flex-start; gap: 28px; margin-bottom: 54px; }
.section-title > span { color: #a9afa8; font-family: Georgia, serif; font-size: 32px; line-height: 1.2; }
.section-title p { margin: 0 0 6px; color: var(--green); font-size: 10px; font-weight: 800; letter-spacing: .17em; }
.section-title h2 { margin: 0; font-size: clamp(30px, 4vw, 48px); line-height: 1.35; letter-spacing: -.035em; }
.section-intro { max-width: 760px; margin: -28px 0 54px 61px; color: var(--muted); }

.label { display: inline-flex; width: fit-content; padding: 4px 9px; font-size: 10px; font-weight: 800; line-height: 1.5; }
.decided-label { color: var(--green); background: var(--green-soft); }
.hypothesis-label { color: var(--blue); background: var(--blue-soft); }
.pending-label { color: var(--amber); background: var(--amber-soft); }

.summary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.summary-card { padding: 28px; border: 1px solid var(--line); background: white; }
.summary-card h3 { margin: 18px 0 10px; font-size: 16px; }
.summary-card p { margin: 0; color: #494e48; font-size: 14px; }
.summary-card .large-copy { color: var(--green); font-family: "Yu Mincho", serif; font-size: clamp(21px, 2.5vw, 29px); font-weight: 700; line-height: 1.65; }
.one-line { margin-top: 32px; padding: 36px; color: white; background: var(--green); }
.one-line span { font-size: 11px; font-weight: 700; opacity: .72; }
.one-line p { max-width: 900px; margin: 12px 0 0; font-size: clamp(18px, 2.5vw, 28px); font-weight: 700; line-height: 1.7; }
.not-list { margin-top: 46px; }
.not-list h3 { font-size: 17px; }
.not-list ul { columns: 2; padding-left: 22px; color: #50554f; font-size: 14px; }
.not-list li { margin-bottom: 7px; break-inside: avoid; }

.timeline { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.timeline > li { display: grid; grid-template-columns: 65px 1fr; gap: 20px; padding: 36px 0; border-bottom: 1px solid var(--line); }
.timeline > li > span { color: var(--green); font-family: Georgia, serif; font-size: 21px; }
.timeline h3 { margin: 0 0 12px; font-size: 20px; }
.timeline p { max-width: 860px; margin: 0; color: #515650; font-size: 14px; }
.timeline p + p { margin-top: 12px; }
.timeline .learning { padding: 10px 14px; background: var(--soft); color: var(--ink); }
.timeline blockquote { max-width: 810px; margin: 20px 0 0; padding: 20px 24px; border-left: 3px solid var(--green); background: white; font-size: 16px; font-weight: 700; }

.belief { margin-bottom: 42px; padding: 38px; border: 1px solid var(--line); background: white; }
.belief p { margin: 20px 0 0; font-family: "Yu Mincho", serif; font-size: clamp(25px, 4vw, 40px); line-height: 1.6; }
.belief strong { color: var(--green); }
.why-grid { display: grid; grid-template-columns: repeat(3,1fr); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.why-grid article { padding: 30px; }
.why-grid article + article { border-left: 1px solid var(--line); }
.why-grid article > span { color: var(--green); font-size: 11px; font-weight: 800; }
.why-grid h3 { margin: 10px 0 13px; font-size: 20px; }
.why-grid p { margin: 0; color: #50554f; font-size: 14px; }
.principles { margin-top: 58px; }
.principles > h3 { margin-bottom: 20px; font-size: 18px; }
.principles > div { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.principles article { display: grid; grid-template-columns: 35px 1fr; gap: 14px; padding: 22px; background: var(--soft); }
.principles b { color: var(--green); font-family: Georgia, serif; }
.principles p { margin: 0; font-size: 14px; }

.state-definition { max-width: 940px; padding: 34px; border-left: 4px solid var(--blue); background: white; }
.state-definition p { margin: 18px 0 0; font-size: clamp(18px, 2.3vw, 25px); font-weight: 700; line-height: 1.75; }
.user-columns { display: grid; grid-template-columns: repeat(3,1fr); gap: 13px; margin-top: 36px; }
.user-columns article { padding: 26px; border: 1px solid var(--line); background: white; }
.user-columns h3 { margin: 0 0 15px; font-size: 17px; }
.user-columns ul { margin: 0; padding-left: 19px; color: #50554f; font-size: 13px; }
.user-columns li + li { margin-top: 6px; }
.segment-map { margin-top: 58px; }
.segment-map h3 { font-size: 19px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; min-width: 780px; border-collapse: collapse; background: white; font-size: 13px; }
th, td { padding: 16px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--soft); font-size: 11px; }
td:first-child { font-weight: 800; white-space: nowrap; }
.annotation { margin: 16px 0 0; padding: 18px 20px; border-left: 3px solid var(--blue); background: var(--blue-soft); font-size: 13px; }

.persona-header { display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; margin-bottom: 34px; padding: 35px; color: white; background: var(--green); }
.persona-header .label { color: white; background: rgba(255,255,255,.16); }
.persona-header h3 { margin: 16px 0 0; font-size: 27px; }
.persona-header p { margin: 0; font-size: 16px; font-weight: 600; }
.persona-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }
.persona-grid article { padding: 27px; border: 1px solid var(--line); background: white; }
.persona-grid .wide { grid-column: 1 / -1; background: var(--green-soft); }
.persona-grid h4 { margin: 0 0 12px; font-size: 15px; }
.persona-grid p { margin: 0; color: #50554f; font-size: 14px; }

.product-definition { max-width: 900px; padding: 28px; background: white; border: 1px solid var(--line); }
.product-definition h3 { margin: 0 0 9px; font-size: 17px; }
.product-definition p { margin: 0; color: #50554f; font-size: 14px; }
.flow { display: flex; align-items: stretch; margin: 42px 0; overflow-x: auto; padding-bottom: 8px; }
.flow > div { flex: 0 0 127px; display: flex; flex-direction: column; min-height: 125px; padding: 15px; border: 1px solid var(--line); background: white; }
.flow > i { flex: 0 0 27px; display: grid; place-items: center; color: var(--muted); font-style: normal; }
.flow b { color: var(--green); font-family: Georgia, serif; font-size: 12px; }
.flow strong { margin-top: 14px; font-size: 14px; }
.flow span { margin-top: auto; color: var(--muted); font-size: 10px; }
.funnel-notes { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }
.funnel-notes article { padding: 27px; border: 1px solid var(--line); background: white; }
.funnel-notes ul, .funnel-notes p { margin: 18px 0 0; color: #50554f; font-size: 13px; }
.funnel-notes ul { padding-left: 20px; }
.message-draft { margin-top: 48px; padding: 36px; background: var(--soft); }
.message-draft > span { color: var(--green); font-size: 11px; font-weight: 800; }
.message-draft blockquote { margin: 18px 0 12px; font-family: "Yu Mincho", serif; font-size: clamp(18px, 2.5vw, 27px); font-weight: 700; line-height: 1.8; }
.message-draft p { margin: 0; color: var(--muted); font-size: 11px; }

.open-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 13px; }
.open-grid article { padding: 25px; border: 1px solid var(--line); background: white; }
.open-grid b { color: var(--amber); font-family: Georgia, serif; font-size: 15px; }
.open-grid h3 { margin: 12px 0 10px; font-size: 17px; }
.open-grid p { margin: 0; color: #50554f; font-size: 13px; }
.next-step { margin-top: 50px; padding: 36px; border: 1px solid #e4d1ad; background: var(--amber-soft); }
.next-step h3 { margin: 18px 0 10px; font-size: 23px; }
.next-step p { max-width: 850px; margin: 0; font-size: 14px; }

footer { max-width: var(--max); margin: 0 auto; padding: 50px 5vw 70px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
footer p { margin: 0 0 5px; }
footer a { display: inline-block; margin-top: 16px; color: var(--green); font-weight: 800; text-decoration: none; }

@media (max-width: 900px) {
  .menu-button { display: block; }
  .site-nav {
    display: none; position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0; padding: 10px 4vw 18px;
    border-bottom: 1px solid var(--line); background: var(--paper);
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 11px 0; border-bottom: 1px solid var(--line); }
  .why-grid, .user-columns, .open-grid { grid-template-columns: 1fr; }
  .why-grid article + article { border-left: 0; border-top: 1px solid var(--line); }
  .open-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 680px) {
  .intro, .section { padding: 72px 5vw; }
  .intro { padding-top: 9vh; }
  .intro h1 em { display: block; margin-top: 10px; font-size: .43em; }
  .notice, .persona-header { grid-template-columns: 1fr; gap: 12px; }
  .summary-grid, .principles > div, .persona-grid, .funnel-notes, .open-grid { grid-template-columns: 1fr; }
  .persona-grid .wide { grid-column: auto; }
  .not-list ul { columns: 1; }
  .section-title { gap: 16px; }
  .section-title > span { font-size: 24px; }
  .section-intro { margin-left: 0; }
  .timeline > li { grid-template-columns: 40px 1fr; gap: 10px; }
  .belief, .state-definition, .one-line, .message-draft, .next-step { padding: 25px; }
  .wordmark small { display: none; }
}