/* ===================================================
   cases.css — 実績・事例ページ専用スタイル
   top.css + maintenance.css + common.css と併用
   クラスプレフィックス: cs-
   =================================================== */

/* ===================================================
   01. HERO
   =================================================== */
.cs-hero {
  position: relative;
  min-height: 440px;
  padding: 80px 0 90px;
  overflow: hidden;
  color: #fff;
}
.cs-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  z-index: 0;
}
.cs-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(19, 45, 127, 0.90) 0%, rgba(29, 69, 164, 0.80) 100%);
  z-index: 1;
}
.cs-hero__container {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}
.cs-hero__breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 28px;
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.55);
}
.cs-hero__breadcrumb a {
  color: rgba(255, 255, 255, 0.55);
  text-decoration: none;
  transition: color 0.2s ease;
}
.cs-hero__breadcrumb a:hover { color: rgba(255, 255, 255, 0.9); }
.cs-hero__breadcrumb span { color: rgba(255, 255, 255, 0.35); }
.cs-hero__eyebrow {
  font-family: "Shippori Mincho", serif;
  font-size: 0.875rem;
  letter-spacing: 0.3em;
  color: var(--rc-gold);
  margin: 0 0 16px;
  font-weight: 500;
}
.cs-hero__title {
  font-family: "Shippori Mincho", serif;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 600;
  margin: 0 0 12px;
  letter-spacing: 0.02em;
  line-height: 1.15;
}
.cs-hero__sub {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 1.125rem;
  font-weight: 500;
  margin: 0 0 28px;
  color: var(--rc-gold);
}
.cs-hero__lead {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.9375rem;
  line-height: 1.9;
  max-width: 600px;
  margin: 0;
  opacity: 0.9;
}

/* ===================================================
   02. FILTER
   =================================================== */
.cs-filter {
  background: #fff;
  border-bottom: 1px solid #e5e8ee;
  position: sticky;
  top: 0;
  z-index: 90;
}
.cs-filter__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 18px 40px;
}
.cs-filter__label {
  font-family: "Shippori Mincho", serif;
  font-size: 0.6875rem;
  letter-spacing: 0.3em;
  color: var(--rc-gold);
  margin: 0 0 10px;
  font-weight: 600;
}
.cs-filter__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.cs-filter__tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 14px;
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.75rem;
  color: var(--coolgray-60);
  background: transparent;
  border: 1px solid #c1c7cd;
  cursor: pointer;
  border-radius: 30px;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.cs-filter__tag:hover {
  border-color: var(--rc-navy);
  color: var(--rc-navy);
}
.cs-filter__tag.is-active {
  background: var(--rc-gold);
  border-color: var(--rc-gold);
  color: #fff;
}
.cs-filter__tag[hidden] { display: none; }

/* ===================================================
   03. CASE LIST
   =================================================== */
.cs-list {
  position: relative;
  overflow: hidden;
  background: #f8f9fb;
  padding: 100px 0 120px;
}
.cs-list__container {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}

/* カードグリッド */
.cs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 56px;
}
.cs-card {
  background: #fff;
  border: 1px solid #e5e8ee;
  display: flex;
  flex-direction: column;
  transition: border-color 0.25s ease;
  position: relative;
}
.cs-card:hover { border-color: var(--rc-gold); }
.cs-card[hidden] { display: none; }

.cs-card__img-wrap {
  overflow: hidden;
  height: 210px;
  flex-shrink: 0;
}
.cs-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.cs-card:hover .cs-card__img { transform: scale(1.04); }

.cs-card__body {
  padding: 28px 28px 32px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.cs-card__meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}
.cs-card__service-tag {
  display: inline-block;
  padding: 3px 10px;
  font-family: "Shippori Mincho", serif;
  font-size: 0.625rem;
  letter-spacing: 0.15em;
  font-weight: 600;
  align-self: flex-start;
}
.cs-card__service-tag--building {
  background: var(--rc-navy);
  color: #fff;
}
.cs-card__service-tag--hr {
  background: var(--rc-gold);
  color: #fff;
}
.cs-card__badge {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.6875rem;
  color: var(--coolgray-60);
  line-height: 1.6;
}
.cs-card__title {
  font-family: "Shippori Mincho", serif;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--rc-navy);
  line-height: 1.7;
  margin: 0 0 12px;
  letter-spacing: 0.02em;
}
.cs-card__desc {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.8125rem;
  color: var(--coolgray-60);
  line-height: 1.9;
  margin: 0 0 20px;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.cs-card__result {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid #e5e8ee;
  margin-bottom: 18px;
}
.cs-card__result-label {
  font-family: "Shippori Mincho", serif;
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  color: var(--rc-gold);
  font-weight: 600;
  flex-shrink: 0;
}
.cs-card__result-text {
  font-family: "Shippori Mincho", serif;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--rc-navy);
  letter-spacing: 0.02em;
}
.cs-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: "Shippori Mincho", serif;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--rc-navy);
  text-decoration: none;
  border-bottom: 1px solid var(--rc-gold);
  padding-bottom: 2px;
  align-self: flex-start;
  transition: color 0.2s ease;
}
.cs-card__link:hover { color: var(--rc-gold); }
.cs-card__link::after {
  content: "";
  position: absolute;
  inset: 0;
}

/* 結果なし */
.cs-grid__empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 0;
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.9375rem;
  color: var(--coolgray-60);
}

/* ===================================================
   04. CTA
   =================================================== */
.cs-cta {
  position: relative;
  overflow: hidden;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cs-cta__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.cs-cta__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(19, 45, 127, 0.92) 0%, rgba(10, 20, 70, 0.85) 100%);
}
.cs-cta__container {
  position: relative;
  z-index: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 80px 60px;
  text-align: center;
}
.cs-cta__eyebrow {
  font-family: "Shippori Mincho", serif;
  font-size: 0.6875rem;
  letter-spacing: 0.35em;
  color: var(--rc-gold);
  font-weight: 600;
  margin: 0 0 20px;
}
.cs-cta__title {
  font-family: "Shippori Mincho", serif;
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  font-weight: 500;
  color: #fff;
  line-height: 1.45;
  letter-spacing: 0.04em;
  margin: 0 0 8px;
}
.cs-cta__lead {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.9;
  margin: 0 0 40px;
}
.cs-cta__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.cs-cta__actions-primary {
  display: flex;
  justify-content: center;
}
.cs-cta__actions-secondary {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===================================================
   SCROLL REVEAL
   =================================================== */
.cs-card {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease, border-color 0.25s ease;
}
.cs-card.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===================================================
   TABLET (768px - 1023px)
   =================================================== */
@media (min-width: 768px) and (max-width: 1023px) {
  .cs-hero__container { padding: 0 32px; }
  .cs-hero__title { font-size: 3rem; }

  .cs-filter__container { padding: 16px 32px; }

  .cs-list__container { padding: 0 32px; }
  .cs-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }

  .cs-cta__container { padding: 72px 40px; }
  .cs-cta__actions-secondary { flex-direction: column; align-items: center; }
}

/* ===================================================
   SP (max-width: 767px)
   =================================================== */
@media (max-width: 767px) {
  .cs-hero {
    min-height: 360px;
    padding: 110px 0 60px;
  }
  .cs-hero__container { padding: 0 20px; }
  .cs-hero__title { font-size: 2.5rem; }
  .cs-hero__lead { font-size: 0.875rem; }

  .cs-filter { position: static; }
  .cs-filter__container { padding: 14px 20px; }
  .cs-filter__tags { display: none; }

  .cs-list { padding: 64px 0 80px; }
  .cs-list__container { padding: 0 20px; }
  .cs-grid { grid-template-columns: 1fr; gap: 20px; margin-top: 40px; }
  .cs-card__img-wrap { height: 200px; }
  .cs-card__body { padding: 20px 20px 24px; }

  .cs-cta__container { padding: 64px 24px; }
  .cs-cta__title { font-size: 1.75rem; }
  .cs-cta__actions-secondary { flex-direction: column; align-items: center; width: 100%; }
  .cs-cta__btn { width: 100%; max-width: 320px; justify-content: center; }

  .sub-bg-text { font-size: clamp(3.5rem, 18vw, 6rem); }
}