/* ============================================================
   re:Question — 共通スタイル (site.css)
   Header / Footer / Contact / Hamburger / Reveal
============================================================ */

/* ===== Reset ===== */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { display: block; max-width: 100%; }
button { font: inherit; border: none; background: none; cursor: pointer; color: inherit; }
html { font-size: 62.5%; scroll-behavior: smooth; }

/* ===== Design tokens ===== */
:root {
  --c-text:        #212121;
  --c-ink-mid:     #575757;
  --c-ink-soft:    #848484;
  --c-line:        #e8e8e8;
  --c-line-soft:   #f5f5f5;
  --c-main:        #2b235c;
  --c-point:       #4e42a8;
  --c-accent-2:    #c7a56b;
  --c-warm:        #efe4d2;
  --c-warm-light:  #f7f0e2;
  --c-warm-soft:   #faf5ec;
  --c-ink:    var(--c-text);
  --c-brand:  var(--c-main);
  --f-jp:    "ヒラギノ角ゴ ProN W3", "Hiragino Kaku Gothic ProN", "游ゴシック Medium", YuGothic, "メイリオ", Meiryo, sans-serif;
  --f-en:    "Helvetica Neue", Arial, sans-serif;
  --f-serif: "Hiragino Mincho ProN", "Yu Mincho", "游明朝", "Noto Serif JP", serif;
  --radius:    8px;
  --radius-sm: 6px;
  --t-duration: 0.3s;
  --t-function: ease;
}

/* ===== Base ===== */
body {
  font-family: var(--f-jp);
  color: var(--c-text);
  background: var(--c-warm-soft);
  font-size: 1.8rem;
  line-height: 1.7;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  font-weight: 400;
  overflow-x: hidden;
}
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 32px; }

/* ===== Header ===== */
.site-header {
  border-bottom: 1px solid rgba(43,35,92,0.08);
  background: rgba(247,240,226,0.92);
  backdrop-filter: saturate(180%) blur(10px);
  position: sticky; top: 0; z-index: 1000;
}
.site-header__inner {
  max-width: 1180px; margin: 0 auto; padding: 0 32px;
  display: flex; align-items: center; justify-content: space-between;
  height: 92px;
}
.brand { display: inline-flex; align-items: center; }
.brand img { height: 52px; width: auto; display: block; }
.gnav { display: flex; gap: 36px; align-items: center; }
.gnav a {
  font-size: 18px; color: var(--c-ink-mid); font-weight: 700;
  letter-spacing: 0.04em;
  transition: color var(--t-duration) var(--t-function);
  position: relative;
}
.gnav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -8px;
  height: 1px; background: var(--c-main); transform: scaleX(0);
  transition: transform var(--t-duration) var(--t-function);
  transform-origin: left;
}
.gnav a:hover { color: var(--c-main); }
.gnav a:hover::after { transform: scaleX(1); }
.gnav a.is-current { color: var(--c-main); font-weight: 700; }
.gnav a.is-current::after { transform: scaleX(1); }
.gnav a.gnav__cta {
  padding: 11px 22px;
  color: #fff !important;
  background: var(--c-main);
  border: 1px solid var(--c-main);
  border-radius: var(--radius-sm);
  font-family: var(--f-en); font-size: 15px; font-weight: 700;
  letter-spacing: 0.14em;
  box-shadow: 0 2px 8px rgba(43,35,92,0.18);
  transition: background var(--t-duration) var(--t-function),
              border-color var(--t-duration) var(--t-function),
              transform var(--t-duration) var(--t-function),
              box-shadow var(--t-duration) var(--t-function);
}
.gnav a.gnav__cta::after { display: none; }
.gnav a.gnav__cta:hover {
  background: var(--c-point); border-color: var(--c-point);
  color: #fff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(43,35,92,0.28);
}

/* ===== Breadcrumb ===== */
.breadcrumb-bottom {
  border-top: 1px solid rgba(43,35,92,0.10);
  background: var(--c-warm-light);
  padding: 14px 0;
}
.breadcrumb {
  font-family: var(--f-en);
  font-size: 11.5px; color: var(--c-ink-soft);
  letter-spacing: 0.06em;
}
.breadcrumb a { color: var(--c-ink-soft); transition: color var(--t-duration) var(--t-function); }
.breadcrumb a:hover { color: var(--c-main); }
.breadcrumb__sep { margin: 0 6px; }
.breadcrumb .current { color: var(--c-ink-mid); }

/* ===== Footer ===== */
footer {
  background: var(--c-warm-light);
  padding: 28px 0;
  border-top: 1px solid rgba(43,35,92,0.1);
}
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  gap: 24px;
}
.footer__copy {
  font-family: var(--f-en); font-size: 11.5px;
  color: var(--c-ink-soft); letter-spacing: 0.04em;
}
.footer__parent {
  display: inline-flex; align-items: center;
  transition: opacity var(--t-duration) var(--t-function);
}
.footer__parent img { height: 34px; width: auto; max-width: none; display: block; object-fit: contain; }
.footer__parent { flex-shrink: 0; }
.footer__parent:hover { opacity: 0.7; }
.footer__trademark {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(43,35,92,0.08);
  font-size: 11px;
  color: var(--c-ink-soft);
  letter-spacing: 0.02em;
  line-height: 1.7;
}

/* ===== Reveal animation ===== */
.reveal {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ===== SP Hamburger & Drawer ===== */
.ham-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 0;
  cursor: pointer;
  flex-shrink: 0;
  background: none;
  border: none;
}
.ham-btn__line {
  display: block;
  width: 22px;
  height: 2px;
  background: #2b235c;
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.2s ease;
  transform-origin: center;
}
body.sp-nav-open .ham-btn .ham-btn__line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
body.sp-nav-open .ham-btn .ham-btn__line:nth-child(2) {
  opacity: 0;
}
body.sp-nav-open .ham-btn .ham-btn__line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}
.sp-nav {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: #faf5ec;
  z-index: 999;
  flex-direction: column;
  padding: 88px 40px 60px;
  overflow-y: auto;
}
body.sp-nav-open .sp-nav { display: flex; }
.sp-nav__list {
  display: flex;
  flex-direction: column;
  margin-bottom: 40px;
}
.sp-nav__item { border-bottom: 1px solid rgba(43,35,92,0.1); }
.sp-nav__link {
  display: block;
  font-family: var(--f-en);
  font-size: 30px;
  font-weight: 700;
  color: #2b235c;
  letter-spacing: 0.04em;
  padding: 20px 0;
  transition: opacity 0.2s;
}
.sp-nav__link:hover { opacity: 0.5; }
.sp-nav__link.is-current { opacity: 0.3; pointer-events: none; }
.sp-nav__cta {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  background: #2b235c;
  color: #fff !important;
  font-family: var(--f-en);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  border-radius: 6px;
  box-shadow: 0 2px 10px rgba(43,35,92,0.25);
  transition: background 0.2s, transform 0.15s;
}
.sp-nav__cta:hover { background: #4e42a8; transform: translateY(-1px); }

/* SP切り替え — ベースルールより後に置くことで確実に上書き */
@media (max-width: 768px) {
  .gnav { display: none; }
  .ham-btn { display: flex; }
  .site-header__inner { height: 64px; }
  .brand img { height: 34px; }
}

/* ===== Article body: figure / figcaption ===== */
.article-body figure {
  margin: 40px 0;
}
.article-body figure img {
  width: 100%;
  display: block;
}
.article-body figcaption {
  text-align: left;
  font-size: 12px;
  color: var(--c-ink-soft);
  letter-spacing: 0.04em;
  line-height: 1.6;
  margin-top: 6px;
  padding-left: 2px;
}


/* ===== Article card (shared: contents listing + related section) ===== */
.article-card {
  display: flex; flex-direction: column;
  transition: opacity var(--t-duration) var(--t-function);
}
.article-card:hover { opacity: 0.85; }
.article-card__thumb {
  aspect-ratio: 16 / 10;
  background: var(--c-warm-soft);
  overflow: hidden;
  margin-bottom: 14px;
}
.article-card__thumb img {
  width: 100%; height: 100%;
  display: block; object-fit: cover;
  transition: transform 0.6s cubic-bezier(.2,.7,.3,1);
}
.article-card:hover .article-card__thumb img { transform: scale(1.05); }
.article-card__cat {
  display: inline-block;
  font-family: var(--f-en); font-size: 10px; font-weight: 700;
  letter-spacing: 0.2em; color: var(--c-main);
  border: 1px solid var(--c-main);
  padding: 4px 10px; margin-bottom: 12px;
  align-self: flex-start; text-transform: uppercase;
}
.article-card__title {
  font-size: 17px; font-weight: 700; line-height: 1.6;
  color: var(--c-ink); margin-bottom: 10px;
}
.article-card:hover .article-card__title { color: var(--c-main); }
.article-card__sub {
  font-size: 13px; color: var(--c-ink-mid);
  line-height: 1.55; margin: 4px 0 10px;
}
.article-card__meta { margin-top: auto; padding-top: 8px; }
.article-card__date {
  display: block;
  font-family: var(--f-en); font-size: 11.5px;
  color: var(--c-ink-soft); letter-spacing: 0.06em;
  margin-bottom: 8px;
}
.article-card__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.article-card__tag {
  font-size: 11.5px; color: var(--c-ink-mid); letter-spacing: 0.02em;
}
.article-card__tag::before {
  content: "#"; color: var(--c-accent-2);
  font-weight: 700; margin-right: 2px; font-family: var(--f-en);
}
.article-card.is-hidden { display: none; }

/* ===== Section title (shared) ===== */
.sec__title {
  display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap;
}
.sec__title-en {
  font-family: var(--f-en);
  font-size: 32px; font-weight: 700;
  color: var(--c-main); letter-spacing: 0.06em; line-height: 1;
}
.sec__title-jp {
  font-family: var(--f-jp);
  font-size: 13px; font-weight: 500;
  color: var(--c-ink-mid); letter-spacing: 0.1em;
  padding-left: 16px; position: relative;
}
.sec__title-jp::before {
  content: "";
  position: absolute; left: 0; top: 50%;
  transform: translateY(-50%);
  width: 6px; height: 6px;
  background: var(--c-accent-2); border-radius: 50%;
}

/* ===== Related books section ===== */
.related-books {
  padding: 16px 0 80px;
  background: var(--c-warm-light);
}
.rbooks-head { margin-bottom: 40px; }
.rbooks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.rbook-card {
  display: flex; flex-direction: column; height: 100%;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 2px 12px rgba(43,35,92,0.08);
  overflow: hidden;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}
.rbook-card:hover {
  box-shadow: 0 6px 28px rgba(43,35,92,0.16);
  transform: translateY(-3px);
}
.rbook-card__cover {
  background: var(--c-warm);
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.rbook-card__cover img {
  position: absolute;
  top: 0; bottom: 0; left: 50%;
  transform: translateX(-50%);
  height: 100%; width: auto;
  border-radius: 3px;
  box-shadow: 2px 4px 16px rgba(0,0,0,0.22);
  transition: transform 0.4s ease;
}
.rbook-card:hover .rbook-card__cover img { transform: translateX(-50%) scale(1.03); }
.rbook-card__body {
  padding: 18px 20px 22px;
  display: flex; flex-direction: column; flex: 1;
}
.rbook-card__title {
  font-size: 15.5px; font-weight: 700; line-height: 1.5;
  color: var(--c-main); margin-bottom: 6px;
}
.rbook-card:hover .rbook-card__title { text-decoration: underline; }
.rbook-card__meta {
  font-size: 14px; color: var(--c-ink-mid);
  padding-top: 10px;
  line-height: 1.6;
}
.rbook-card__label {
  font-size: 12.5px; font-weight: 400;
  color: var(--c-ink-soft); letter-spacing: 0.04em;
  margin-right: 4px;
}

@media (max-width: 880px) {
  .rbooks-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .sec__title-en { font-size: 24px; }
}
@media (max-width: 560px) {
  .rbooks-grid { grid-template-columns: 1fr; }
}

/* ===== Related: CTA button ===== */
.related-cta {
  text-align: center;
  padding-top: 48px;
}
.related-cta__btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--f-jp); font-size: 15px; font-weight: 700;
  letter-spacing: 0.08em; color: var(--c-main);
  border: 1.5px solid var(--c-main); padding: 14px 44px;
  border-radius: var(--radius-sm);
  transition: background 0.2s, color 0.2s;
}
.related-cta__btn:hover {
  background: var(--c-main); color: #fff;
}

/* ===== Contact CTA ===== */
.contact-cta {
  text-align: center;
  padding: 64px 24px 72px;
  background: var(--c-main);
}
.contact-cta__title {
  font-family: var(--f-jp); font-size: 20px; font-weight: 700;
  color: #fff; letter-spacing: 0.1em; margin-bottom: 32px;
}
.contact-cta__btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--f-en); font-size: 14px; font-weight: 700;
  letter-spacing: 0.14em; color: var(--c-main);
  background: #fff; padding: 15px 52px;
  border-radius: var(--radius-sm);
  transition: opacity 0.2s, transform 0.2s;
}
.contact-cta__btn:hover { opacity: 0.85; transform: translateY(-1px); }
.contact-cta__note {
  margin-top: 20px; font-size: 11.5px;
  color: rgba(255,255,255,0.55);
}

/* SP: contact-cta */
@media (max-width: 768px) {
  .contact-cta { padding: 48px 20px 56px; }
  .contact-cta__title { font-size: 17px; margin-bottom: 24px; }
  .contact-cta__btn { padding: 13px 36px; font-size: 13px; }
  .contact-cta__note { font-size: 11px; }
}