/* ==========================================================================
   Family Design — shared stylesheet
   Design language: book page × research index.
   Paper + ink carry the reading experience; a single cool "sora" blue marks
   everything interactive or structural; "gin" grays draw hairlines only.
   ========================================================================== */

:root {
  --paper: #FAF8F3;
  --paper-raised: #F1EEE6;
  --ink: #17160F;
  --ink-soft: #55534A;
  --sora: #4C7299;
  --sora-tint: #DEE7EE;
  --gin: #C9CDD1;
  --gin-deep: #83878C;

  --measure: 38em;
  --outer: 1180px;
  --radius: 2px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #131417;
    --paper-raised: #1B1D22;
    --ink: #ECE9E1;
    --ink-soft: #ACA89C;
    --sora: #8FB3D8;
    --sora-tint: #202B35;
    --gin: #34373D;
    --gin-deep: #8D9096;
  }
}

:root[data-theme="dark"] {
  --paper: #131417;
  --paper-raised: #1B1D22;
  --ink: #ECE9E1;
  --ink-soft: #ACA89C;
  --sora: #8FB3D8;
  --sora-tint: #202B35;
  --gin: #34373D;
  --gin-deep: #8D9096;
}

* { box-sizing: border-box; }

html { color-scheme: light dark; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Zen Kaku Gothic New', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--sora-tint); color: var(--ink); }

a { color: var(--sora); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--sora); outline-offset: 3px; }

h1, h2, h3 {
  font-family: 'Shippori Mincho', 'Yu Mincho', serif;
  font-weight: 600;
  line-height: 1.5;
  margin: 0;
  text-wrap: balance;
  color: var(--ink);
}

p { margin: 0; }

.wrap {
  max-width: var(--outer);
  margin-inline: auto;
  padding-inline: clamp(20px, 6vw, 64px);
}

.measure { max-width: var(--measure); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--gin-deep);
  font-weight: 700;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--sora);
  display: inline-block;
}

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--gin);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 20px;
  gap: 24px;
  flex-wrap: wrap;
}
.wordmark {
  font-family: 'Shippori Mincho', serif;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: baseline;
  gap: 0.5em;
}
.wordmark span {
  font-family: 'Zen Kaku Gothic New', sans-serif;
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--gin-deep);
}
.wordmark:hover { color: var(--sora); }
.site-nav { display: flex; align-items: center; gap: clamp(16px, 3vw, 32px); }
.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.88rem;
  letter-spacing: 0.02em;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--sora); }
.site-nav a[aria-current="page"] { border-bottom: 1px solid var(--sora); padding-bottom: 2px; }

/* ---------- Hero ---------- */
.hero { padding-block: clamp(48px, 9vw, 96px) clamp(40px, 7vw, 72px); }
.hero .wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: clamp(24px, 6vw, 56px);
  align-items: start;
}
.hero-copy { max-width: 30em; }
.hero .eyebrow { margin-bottom: 22px; }
.hero h1 {
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  letter-spacing: 0.01em;
}
.hero h1 .line-b { color: var(--sora); display: block; }
.hero-sub {
  margin-top: 26px;
  color: var(--ink-soft);
  font-size: 1rem;
  max-width: 34em;
}
.mark {
  width: clamp(64px, 9vw, 92px);
  height: clamp(64px, 9vw, 92px);
  flex: none;
  margin-top: 6px;
}

/* ---------- Sections ---------- */
section { border-top: 1px solid var(--gin); }
.section-pad { padding-block: clamp(44px, 8vw, 80px); }
.section-head { margin-bottom: 30px; }
.section-head h2 {
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  margin-top: 14px;
}
.lede { font-size: 1rem; color: var(--ink-soft); margin-top: 16px; }

.prose p + p { margin-top: 1.5em; }
.prose { max-width: var(--measure); }

.pull {
  border-left: 2px solid var(--sora);
  padding-left: 1.2em;
  margin-block: 1.8em;
  font-family: 'Shippori Mincho', serif;
  font-size: 1rem;
  color: var(--ink);
  line-height: 1.85;
}

/* ---------- Four conditions (numbered system) ---------- */
.conditions {
  display: grid;
  grid-template-columns: 44px 1fr;
  column-gap: 20px;
  max-width: 640px;
}
.condition {
  display: contents;
}
.condition .num {
  grid-column: 1;
  position: relative;
  font-family: 'Shippori Mincho', serif;
  font-size: 1.05rem;
  color: var(--sora);
  padding-top: 2px;
}
.condition .num::after {
  content: "";
  position: absolute;
  top: 30px;
  left: 50%;
  width: 1px;
  height: calc(100% + 14px);
  background: var(--gin);
  transform: translateX(-50%);
}
.condition:last-child .num::after { display: none; }
.condition .text {
  grid-column: 2;
  padding-bottom: 34px;
}
.condition .text strong {
  display: block;
  font-family: 'Shippori Mincho', serif;
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 4px;
}
.condition .text span { color: var(--ink-soft); font-size: 1rem; }

.loop {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--gin-deep);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  margin-top: -8px;
  padding-left: 64px;
}
.loop svg { flex: none; }

/* ---------- Author teaser card ---------- */
.author-teaser {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 20px;
  align-items: start;
  max-width: 640px;
}
.avatar {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--paper-raised);
  border: 1px solid var(--gin);
  display: flex; align-items: center; justify-content: center;
  font-family: 'Shippori Mincho', serif;
  font-size: 1.3rem;
  color: var(--sora);
}
.author-teaser p { color: var(--ink-soft); }
.author-teaser .more { display: inline-block; margin-top: 10px; font-size: 0.92rem; }

/* ---------- Family Design teaser ---------- */
.tag {
  display: inline-block;
  border: 1px solid var(--sora);
  color: var(--sora);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 18px;
}

/* ---------- CTA ---------- */
.cta-block {
  background: var(--paper-raised);
  border-top: 1px solid var(--gin);
  border-bottom: 1px solid var(--gin);
}
.cta-inner {
  padding-block: clamp(40px, 7vw, 64px);
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
}
.cta-inner p.lede { color: var(--ink-soft); margin-bottom: 26px; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-size: 1rem;
  letter-spacing: 0.02em;
  padding: 16px 32px;
  border-radius: var(--radius);
  transition: background 0.15s ease;
}
.btn-primary:hover { background: var(--sora); color: var(--paper); }
.cta-note { margin-top: 16px; font-size: 0.82rem; color: var(--gin-deep); }

.sub-links {
  display: flex;
  justify-content: center;
  gap: clamp(16px, 4vw, 36px);
  flex-wrap: wrap;
  margin-top: 22px;
  font-size: 0.9rem;
}
.sub-links a { color: var(--ink-soft); text-decoration: none; border-bottom: 1px solid var(--gin); }
.sub-links a:hover { color: var(--sora); border-color: var(--sora); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--gin); }
.site-footer .wrap {
  padding-block: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.82rem;
  color: var(--gin-deep);
}
.site-footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
.site-footer a { color: var(--gin-deep); text-decoration: none; }
.site-footer a:hover { color: var(--sora); }

/* ---------- Section with side card (image / diagram) ---------- */
.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}
.side-card {
  position: sticky;
  top: 28px;
}
.side-card figure { margin: 0; }
.side-card .card-frame {
  background: var(--paper-raised);
  border: 1px solid var(--gin);
  padding: 18px 18px 16px;
}
.side-card .card-frame img,
.side-card .card-frame svg {
  display: block;
  width: 100%;
  height: auto;
}
.side-card figcaption {
  margin-top: 10px;
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  color: var(--gin-deep);
  text-align: center;
}

/* book cover mini-card */
.cover-kicker {
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--sora);
  font-weight: 700;
  margin: 0 0 10px;
}
.cover-title {
  font-family: 'Shippori Mincho', serif;
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.55;
  margin: 0 0 12px;
}
.cover-author {
  margin: 10px 0 0;
  font-size: 0.74rem;
  color: var(--ink-soft);
  text-align: right;
}
.cover-band {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--gin);
  font-size: 0.68rem;
  line-height: 1.7;
  color: var(--ink-soft);
  font-style: italic;
}

.card-frame--cover { padding: 14px; }
.card-frame--cover img { border: 1px solid var(--gin); }
.card-frame--flush { background: none; border: none; padding: 0; }

@media (max-width: 860px) {
  .section-grid,
  .section-grid[style] { grid-template-columns: 1fr !important; }
  .side-card { position: static; max-width: 220px; margin: 0 auto 8px; }
  .side-card--wide { max-width: 320px; }
}

/* ---------- About page specifics ---------- */
.bio-card {
  background: var(--paper-raised);
  border: 1px solid var(--gin);
  padding: clamp(20px, 4vw, 32px);
  max-width: 640px;
  font-size: 1rem;
  color: var(--ink-soft);
  line-height: 1.85;
}
.bio-card strong { color: var(--ink); }

/* ---------- Scope notice (program exclusions) ---------- */
.scope-notice {
  border-top: 1px solid var(--gin);
  padding-top: clamp(28px, 5vw, 40px);
}
.scope-notice .eyebrow { color: var(--gin-deep); }
.scope-notice h2 { font-size: clamp(1.05rem, 2vw, 1.25rem); }
.scope-notice .list-plain {
  gap: 10px;
  margin-top: 18px;
}
.scope-notice .list-plain li {
  font-size: 1rem;
  line-height: 1.75;
}
.scope-notice .list-plain li::before { background: var(--gin-deep); }
.scope-notice .foot-note {
  font-size: 1rem;
  color: var(--ink-soft);
  margin-top: 20px;
  line-height: 1.85;
}

/* ---------- Plain list (theme list) ---------- */
.list-plain {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
  max-width: var(--measure);
}
.list-plain li {
  position: relative;
  padding-left: 1.3em;
  color: var(--ink-soft);
  line-height: 1.8;
}
.list-plain li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sora);
}

/* ---------- Process step chip ---------- */
.step-chip {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--paper-raised);
  border: 1px solid var(--gin);
  padding: 14px 20px;
  max-width: var(--measure);
}
.step-chip .num {
  font-family: 'Shippori Mincho', serif;
  color: var(--sora);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  flex: none;
}
.step-chip p { color: var(--ink); font-size: 1rem; }

/* ---------- Stacked short questions ---------- */
.stack-quote {
  border-left: 2px solid var(--sora);
  padding-left: 1.2em;
  margin-block: 1.8em;
  max-width: var(--measure);
}
.stack-quote p {
  font-family: 'Shippori Mincho', serif;
  font-size: 1rem;
  color: var(--ink);
  line-height: 2;
}

.btn-disabled {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--gin);
  color: var(--paper);
  font-size: 1rem;
  letter-spacing: 0.02em;
  padding: 16px 32px;
  border-radius: var(--radius);
  cursor: default;
  user-select: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .mark { display: none; }
  .conditions { grid-template-columns: 34px 1fr; column-gap: 14px; }
  .loop { padding-left: 48px; }
  .author-teaser { grid-template-columns: 48px 1fr; }
  .avatar { width: 48px; height: 48px; font-size: 1.05rem; }
}