/* ============================================
   BLACK SIGN 特集ページ専用CSS
   CUVIC SAITAMA / TENJIKU (TCD091)
   ============================================ */

/* ---- 変数 ----
   フォントはサイト共通の Futura PT / Zen Kaku Gothic New を継承。
   価格のみ別フォントにしたい場合は --bks-price を差し替え。 */
.bks-page {
  --bks-bg: #0d0d0d;
  --bks-bg-soft: #161616;
  --bks-card: #1a1a1a;
  --bks-line: #2b2b2b;
  --bks-text: #f2efe9;
  --bks-text-sub: #9a978f;
  --bks-gold: #b8965a;
  --bks-gold-bright: #cfa96a;
  --bks-ivory: #f2efe9;
  --bks-en: 'futura-pt', 'Futura PT', 'Zen Kaku Gothic New', sans-serif;
  --bks-min: 'Zen Kaku Gothic New', 'Hiragino Kaku Gothic ProN', sans-serif;
  --bks-price: var(--bks-en); /* 例: 'did-medium', serif 等に変更可 */
  --bks-slide-w: min(900px, 74vw);
  --bks-slide-gap: 24px;

  background: var(--bks-bg);
  color: var(--bks-text);
  font-size: 15px;
  line-height: 1.8;
  overflow-x: hidden;
}
.bks-page * { box-sizing: border-box; }
.bks-page img { max-width: 100%; height: auto; display: block; }
.bks-page a { text-decoration: none; color: inherit; }

/* ---- フルワイド化（固定ページのコンテンツ幅を突き抜ける） ---- */
.bks-full {
  width: 100vw;
  margin-left: calc(50% - 50vw);
}

/* ---- 内側コンテナ ---- */
.bks-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   1. HERO
   ============================================ */
.bks-hero {
  position: relative;
  min-height: 78vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background:
    linear-gradient(180deg, rgba(8, 8, 8, .45) 0%, rgba(10, 10, 10, .65) 55%, rgba(13, 13, 13, .96) 100%),
    url('https://cuvic-saitama.com/wp-content/uploads/2026/07/black_sign_top01.jpg') center / cover no-repeat;
  /* ↑ IMAGE_HERO.jpg をヒーロー写真のURLに差し替え */
}
.bks-hero__body { padding: 120px 24px; }
.bks-hero__eyebrow {
  font-family: var(--bks-en);
  font-size: 13px;
  letter-spacing: .55em;
  text-indent: .55em;
  color: var(--bks-gold);
  margin: 0 0 22px;
}
.bks-hero__title {
  font-family: var(--bks-en);
  font-weight: 500;
  font-size: clamp(56px, 10vw, 128px);
  letter-spacing: .12em;
  line-height: 1.05;
  color: var(--bks-ivory);
  margin: 0;
}
.bks-hero__rule {
  width: 48px;
  height: 1px;
  background: var(--bks-gold);
  margin: 30px auto;
}
.bks-hero__lead {
  font-family: var(--bks-min);
  font-size: 15px;
  letter-spacing: .28em;
  text-indent: .28em;
  color: var(--bks-text-sub);
  margin: 0;
}
.bks-hero__scroll {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--bks-en);
  font-size: 11px;
  letter-spacing: .4em;
  color: var(--bks-text-sub);
}
.bks-hero__scroll::after {
  content: '';
  display: block;
  width: 1px;
  height: 34px;
  background: var(--bks-gold);
  margin: 10px auto 0;
  animation: bks-drop 2.2s ease-in-out infinite;
}
@keyframes bks-drop {
  0%   { transform: scaleY(0); transform-origin: top; }
  45%  { transform: scaleY(1); transform-origin: top; }
  55%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============================================
   2. コンセプト
   ============================================ */
.bks-concept { padding: 96px 0 80px; }
.bks-concept__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.bks-concept__title {
  font-family: var(--bks-min);
  font-weight: 500 !important;
  font-size: 26px !important;
  letter-spacing: .1em;
  line-height: 1.7 !important;
  color: var(--bks-ivory);
  margin: 0 0 28px !important;
  text-align: left !important;
}
.bks-concept__title em {
  font-style: normal;
  color: var(--bks-gold-bright);
}
.bks-concept__text {
  font-size: 14px;
  color: var(--bks-text-sub);
  margin: 0 0 1.4em !important;
}
.bks-concept__img img {
  border: 1px solid var(--bks-line);
}

/* ============================================
   2b. 黒い看板の利点
   ============================================ */
.bks-adv {
  background: var(--bks-bg-soft);
  padding: 88px 0 80px;
}
.bks-adv__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.bks-adv__item {
  background: var(--bks-bg);
  border-top: 1px solid var(--bks-gold);
  padding: 30px 26px 32px;
}
.bks-adv__num {
  font-family: var(--bks-en);
  font-size: 30px;
  letter-spacing: .06em;
  color: var(--bks-gold);
  margin: 0 0 14px;
  line-height: 1;
}
.bks-adv__name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--bks-ivory);
  margin: 0 0 12px;
}
.bks-adv__text {
  font-size: 13px;
  color: var(--bks-text-sub);
  margin: 0;
}

/* ============================================
   2c. 導入事例スライダー
   ============================================ */
.bks-works { padding: 88px 0 80px; }
.bks-slider {
  position: relative;
  margin-top: 44px;
}
.bks-slider__viewport {
  overflow: hidden;
  padding: 0 calc((100% - var(--bks-slide-w)) / 2);
}
.bks-slider__track {
  display: flex;
  transition: transform .55s cubic-bezier(.4, 0, .2, 1);
}
.bks-slide {
  flex: 0 0 var(--bks-slide-w);
  width: var(--bks-slide-w);
  margin-right: var(--bks-slide-gap);
  position: relative;
  opacity: .35;
  transition: opacity .55s;
}
.bks-slide.is-current { opacity: 1; }
.bks-slide img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--bks-line);
}
.bks-slide__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 12px 18px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: #d6d3cc;
  background: rgba(13, 13, 13, .72);
}
.bks-slider__btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--bks-gold);
  background: rgba(13, 13, 13, .85);
  color: var(--bks-gold-bright);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  z-index: 2;
  transition: background .3s, color .3s;
}
.bks-slider__btn:hover { background: var(--bks-gold); color: #111; }
.bks-slider__btn--prev { left: -8px; }
.bks-slider__btn--next { right: -8px; }
.bks-slider__dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 22px;
}
.bks-slider__dots button {
  width: 26px;
  height: 3px;
  padding: 0;
  border: 0;
  background: #3a3a3a;
  cursor: pointer;
  transition: background .3s;
}
.bks-slider__dots button.is-active { background: var(--bks-gold); }

/* ============================================
   3. カテゴリナビ
   ============================================ */
.bks-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(13, 13, 13, .92);
  backdrop-filter: blur(6px);
  border-top: 1px solid var(--bks-line);
  border-bottom: 1px solid var(--bks-line);
}
.bks-nav__list {
  list-style: none !important;
  margin: 0;
  padding: 14px 16px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.bks-nav__list li { list-style: none !important; }
.bks-nav__list a {
  display: inline-block;
  padding: 10px 20px;
  border: 1px solid var(--bks-line);
  border-radius: 999px;
  background: transparent;
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--bks-text-sub) !important;
  text-decoration: none !important;
  transition: color .25s, border-color .25s, background .25s;
}
.bks-nav__list a:visited,
.bks-nav__list a:link { color: var(--bks-text-sub) !important; }
.bks-nav__list a:hover {
  color: var(--bks-gold-bright) !important;
  border-color: var(--bks-gold);
  background: rgba(184, 150, 90, .08);
}
.bks-nav__list a.is-active {
  color: #111 !important;
  border-color: var(--bks-gold);
  background: var(--bks-gold);
}

/* ============================================
   4. 商品セクション
   ============================================ */
.bks-section { padding: 88px 0 72px; }
.bks-section--alt { background: var(--bks-bg-soft); }

.bks-section__eyebrow {
  font-family: var(--bks-en);
  font-size: 13px;
  letter-spacing: .45em;
  color: var(--bks-gold);
  margin: 0 0 10px !important;
}
.bks-section__title {
  font-family: var(--bks-min);
  font-weight: 500 !important;
  font-size: 28px !important;
  letter-spacing: .14em;
  color: var(--bks-ivory);
  margin: 0 0 14px !important;
  padding-bottom: 18px !important;
  position: relative;
}
.bks-section__title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 42px;
  height: 1px;
  background: var(--bks-gold);
}
.bks-section__desc {
  font-size: 13.5px;
  color: var(--bks-text-sub);
  margin: 0 0 44px;
  max-width: 640px;
}

/* ---- 商品グリッド ---- */
.bks-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

/* ---- 商品カード ---- */
.bks-card {
  display: block;
  background: var(--bks-card);
  border: 1px solid var(--bks-line);
  border-radius: 4px;
  overflow: hidden;
  transition: border-color .35s, transform .35s;
}
.bks-card:hover {
  border-color: var(--bks-gold);
  transform: translateY(-4px);
}
.bks-card__img {
  position: relative;
  margin: 0;
  aspect-ratio: 1 / 1;
  background: #e9e7e1;
  overflow: hidden;
}
.bks-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}
.bks-card:hover .bks-card__img img { transform: scale(1.05); }

.bks-led {
  position: absolute;
  top: 10px;
  left: 10px;
  font-family: var(--bks-en);
  font-size: 11px;
  letter-spacing: .18em;
  color: #1a1a1a;
  background: var(--bks-gold-bright);
  padding: 3px 10px;
  border-radius: 999px;
}
.bks-card__body { padding: 16px 16px 18px; }
.bks-card__name {
  font-size: 13px !important;
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: .04em;
  color: #d6d3cc;
  margin: 0 0 10px;
  transition: color .3s;
}
.bks-card:hover .bks-card__name { color: var(--bks-ivory); }
.bks-card__price {
  font-family: var(--bks-price);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--bks-gold-bright);
  margin: 0;
}
.bks-card__price small {
  font-size: 10.5px;
  font-weight: 400;
  color: var(--bks-text-sub);
  margin-left: 4px;
}

/* ---- 一覧リンクボタン ---- */
.bks-more { text-align: center; margin-top: 48px !important; }
.bks-more a {
  display: inline-block;
  min-width: 300px;
  padding: 16px 40px;
  border: 1px solid var(--bks-gold);
  color: var(--bks-gold-bright) !important;
  font-size: 13px;
  letter-spacing: .22em;
  text-indent: .22em;
  position: relative;
  overflow: hidden;
  transition: color .35s;
  z-index: 1;
}
.bks-more a::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--bks-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s ease;
  z-index: -1;
}
.bks-more a:hover { color: #111 !important; }
.bks-more a:hover::before { transform: scaleX(1); }

/* ============================================
   5. WHITE SIGN バナー
   ============================================ */
.bks-white {
  position: relative;
  background:
    linear-gradient(rgba(242, 239, 233, .88), rgba(242, 239, 233, .88)),
    url('https://cuvic-saitama.com/wp-content/uploads/2026/05/topimage03-scaled.jpg') center / cover no-repeat;
  /* ↑ IMAGE_WHITE.jpg を背景写真のURLに差し替え */
  padding: 96px 0;
}
.bks-white__grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.bks-white__eyebrow {
  font-family: var(--bks-en);
  font-size: 12px;
  letter-spacing: .5em;
  color: #a08655;
  margin: 0 0 10px;
}
.bks-white__title {
  font-family: var(--bks-en);
  font-weight: 500;
  font-size: clamp(34px, 5vw, 52px);
  letter-spacing: .12em;
  color: #141414;
  margin: 0 0 8px !important;
  line-height: 1.1 !important;
}
.bks-white__text {
  font-size: 13.5px;
  color: #6f6c64;
  margin: 0 0 50px !important;
}
.bks-white__btn {
  display: inline-block;
  padding: 15px 44px;
  border: 1px solid #141414;
  color: #141414 !important;
  font-family: var(--bks-en);
  font-size: 13px;
  letter-spacing: .3em;
  text-indent: .3em;
  transition: background .3s, color .3s;
}
.bks-white__btn:hover { background: #141414; color: var(--bks-ivory) !important; }

/* ============================================
   5b. STYLISH SIGN バナー（bks-whiteの左右反転版）
   ============================================ */
.bks-stylish {
  position: relative;
  background:
    linear-gradient(rgba(13, 13, 13, .82), rgba(13, 13, 13, .82)),
    url('https://cuvic-saitama.com/wp-content/uploads/2026/07/white_sign_top01.jpg') center / cover no-repeat;
  /* ↑ IMAGE_STYLISH.jpg を背景写真のURLに差し替え */
  padding: 96px 0;
}
.bks-stylish__grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.bks-stylish .bks-white__eyebrow { color: var(--bks-gold); text-align: right; }
.bks-stylish .bks-white__title { color: var(--bks-ivory); text-align: right;}
.bks-stylish .bks-white__text { color: var(--bks-text-sub); }
.bks-stylish .bks-white__btn {
  border-color: var(--bks-gold);
  color: var(--bks-gold-bright) !important;
}
.bks-stylish .bks-white__btn:hover {
  background: var(--bks-gold);
  color: #111 !important;
}

/* ============================================
   6. CTA
   ============================================ */
.bks-cta {
  padding: 100px 0 110px;
  text-align: center;
}
.bks-cta__title {
  font-family: var(--bks-min);
  font-weight: 500 !important;
  font-size: 24px !important;
  letter-spacing: .16em;
  color: var(--bks-ivory);
  margin: 0 0 18px !important;
}
.bks-cta__text {
  font-size: 13.5px;
  color: var(--bks-text-sub);
  margin: 0 0 40px !important;
}
.bks-cta__btn {
  display: inline-block;
  min-width: 320px;
  padding: 18px 48px;
  background: var(--bks-gold);
  color: #111 !important;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .2em;
  text-indent: .2em;
  transition: background .3s;
}
.bks-cta__btn:hover { background: var(--bks-gold-bright); }

/* ============================================
   スクロールリビール
   ============================================ */
.bks-reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .8s ease, transform .8s ease;
}
.bks-reveal.is-shown {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .bks-reveal { opacity: 1; transform: none; transition: none; }
  .bks-hero__scroll::after { animation: none; }
}

/* ============================================
   レスポンシブ
   ============================================ */
@media (max-width: 1023px) {
  .bks-grid { grid-template-columns: repeat(3, 1fr); }
  .bks-hero {
    background:
      linear-gradient(180deg, rgba(8, 8, 8, .45) 0%, rgba(10, 10, 10, .65) 55%, rgba(13, 13, 13, .96) 100%),
      url('https://cuvic-saitama.com/wp-content/uploads/2026/07/black_sign_top_sp01.jpg') center / cover no-repeat;
  }
  }

@media (min-width: 768px) and (max-width: 1023px) {
    .bks-concept__grid { grid-template-columns: 1fr; gap: 32px; width: 70% !important; margin-left: auto; margin-right: auto;}
  }

@media (max-width: 767px) {
  .bks-hero { min-height: 64vh; }
  .bks-concept { padding: 64px 0 52px; }
  .bks-concept__grid { grid-template-columns: 1fr; gap: 32px; }
  .bks-concept__title { font-size: 21px !important; text-align: center !important;}
  .bks-adv { padding: 60px 0 56px; }
  .bks-adv__grid { grid-template-columns: 1fr; gap: 14px; margin-top: 32px; }
  .bks-works { padding: 60px 0 56px; }
  .bks-page { --bks-slide-w: 86vw; --bks-slide-gap: 12px; }
  .bks-slider__btn { width: 38px; height: 38px; }
  .bks-slider__btn--prev { left: 4px; }
  .bks-slider__btn--next { right: 4px; }
  .bks-nav__list { justify-content: center; overflow-x: visible; flex-wrap: wrap; padding: 12px 14px; gap: 8px; }
  .bks-nav__list a { white-space: nowrap; padding: 8px 14px; font-size: 11.5px; }
  .bks-section { padding: 60px 0 52px; }
  .bks-section__title { font-size: 21px !important; }
  .bks-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .bks-card__body { padding: 12px; }
  .bks-more a { min-width: 0; width: 100%; }
  .bks-white { padding: 64px 0; }
  .bks-white__grid { flex-direction: column; align-items: flex-start; }
  .bks-stylish { padding: 64px 0; }
  .bks-stylish__grid { flex-direction: column; align-items: flex-start; }
  .bks-cta { padding: 68px 0 76px; }
  .bks-cta__btn { min-width: 0; width: 100%; }
}