/* ============================================================
   PAGE HERO
   ============================================================ */
.page-hero {
  background: linear-gradient(150deg, var(--navy-deep) 0%, var(--navy-dark) 48%, var(--navy-mid) 78%, var(--navy) 100%);
  padding: 80px 40px 88px; position: relative; overflow: hidden;
}
.page-hero::before {
  content: 'CASE STUDIES';
  position: absolute; top: 50%; right: 20px; transform: translateY(-50%);
  font-family: 'Cormorant Garamond', serif; font-size: 90px; font-weight: 300;
  color: rgba(255,255,255,.04); letter-spacing: .1em; line-height: 1;
  pointer-events: none; user-select: none; white-space: nowrap;
}
.page-hero::after {
  content: ''; position: absolute; top: -60px; right: 220px;
  width: 280px; height: 280px; border-radius: 50%;
  border: 1px solid rgba(200,160,32,.1); pointer-events: none;
}
.hero-deco-line { position: absolute; top: 0; left: 0; bottom: 0; width: 4px; background: linear-gradient(180deg, var(--gold) 0%, rgba(200,160,32,.2) 100%); }
.page-hero-inner { max-width: 1280px; margin: 0 auto; position: relative; z-index: 2; }
.page-hero-tag { display: inline-block; font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 500; color: var(--gold); letter-spacing: .28em; margin-bottom: 20px; }
.page-hero-title { font-family: 'Noto Serif JP', serif; font-size: clamp(26px, 3.5vw, 42px); font-weight: 600; color: var(--white); line-height: 1.4; letter-spacing: .06em; }
.page-hero-sub { margin-top: 16px; font-family: 'Cormorant Garamond', serif; font-style: italic; font-size: 16px; color: rgba(255,255,255,.55); letter-spacing: .06em; }
/* ヒーロー内サービスカテゴリ表示 */
.hero-cats { display: flex; gap: 10px; margin-top: 32px; flex-wrap: wrap; }
.hero-cat {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 11px; font-weight: 500; letter-spacing: .1em;
  padding: 6px 16px; border-radius: 2px;
  font-family: 'Montserrat', sans-serif;
}
.hero-cat-ai  { color: #7ab0ff; background: rgba(7,9,80,.25); border: 1px solid rgba(120,180,255,.2); }
.hero-cat-hr  { color: var(--gold-light); background: rgba(200,160,32,.18); border: 1px solid rgba(200,160,32,.25); }
.hero-cat-en  { color: #5dd4c4; background: rgba(10,122,106,.22); border: 1px solid rgba(10,122,106,.3); }
.hero-cat::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex-shrink: 0; }

/* ============================================================
   FILTER SECTION
   ============================================================ */
.filter-section {
  background: var(--white);
  border-bottom: 1px solid rgba(7,9,80,.08);
  padding: 0 40px;
  position: sticky; top: 72px; z-index: 100;
  box-shadow: 0 2px 16px rgba(7,9,80,.06);
}
.filter-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; gap: 0; flex-wrap: wrap;
  min-height: 60px;
}
.filter-group {
  display: flex; align-items: center; gap: 0;
  border-right: 1px solid rgba(7,9,80,.08);
  padding: 0 24px 0 0; margin-right: 24px;
}
.filter-group:last-child { border-right: none; padding-right: 0; margin-right: 0; flex: 1; }
.filter-label { font-size: 10px; font-weight: 500; color: var(--text-muted); letter-spacing: .16em; font-family: 'Montserrat', sans-serif; white-space: nowrap; margin-right: 12px; }
.filter-btns { display: flex; gap: 4px; flex-wrap: wrap; padding: 10px 0; }
.filter-btn {
  font-size: 12px; color: var(--text-secondary); background: transparent;
  border: 1px solid rgba(7,9,80,.12); padding: 5px 14px;
  border-radius: var(--radius-sm); cursor: pointer; letter-spacing: .04em;
  transition: background .18s, color .18s, border-color .18s;
  white-space: nowrap; font-family: 'Noto Sans JP', sans-serif;
}
.filter-btn:hover { background: rgba(7,9,80,.04); border-color: rgba(7,9,80,.24); color: var(--navy-link); }
.filter-btn.active { background: var(--navy); color: var(--white); border-color: var(--navy-link); }
.filter-btn.active.srv-ai { background: var(--c-ai); border-color: var(--c-ai); }
.filter-btn.active.srv-hr { background: var(--c-hr); border-color: var(--c-hr); color: var(--navy-deep); }
.filter-btn.active.srv-en { background: var(--c-en); border-color: var(--c-en); }

/* 検索ボックス */
.filter-search {
  display: flex; align-items: center; gap: 10px;
  background: var(--off-white); border: 1px solid rgba(7,9,80,.1);
  border-radius: var(--radius-sm); padding: 6px 14px; flex: 1; max-width: 260px;
  transition: border-color .2s;
}
.filter-search:focus-within { border-color: var(--navy-link); background: var(--white); }
.filter-search svg { opacity: .35; flex-shrink: 0; }
.filter-search input {
  border: none; background: transparent; font-size: 13px; color: var(--text-primary);
  font-family: 'Noto Sans JP', sans-serif; outline: none; width: 100%;
}
.filter-search input::placeholder { color: var(--text-muted); }

/* ============================================================
   FEATURED CASE
   ============================================================ */
.featured-section {
  background: var(--off-white);
  padding: 72px 40px 0;
}
.featured-inner { max-width: 1280px; margin: 0 auto; }
.featured-label { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
.featured-label-tag {
  font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 500;
  color: var(--gold); letter-spacing: .22em;
}
.featured-label-line { flex: 1; height: 1px; background: rgba(200,160,32,.2); max-width: 60px; }

.featured-card {
  background: var(--white);
  border: 1px solid rgba(7,9,80,.09);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid; grid-template-columns: 1fr 1fr;
  box-shadow: var(--shadow-card);
  transition: box-shadow .3s;
}
.featured-card:hover { box-shadow: var(--shadow-hover); }
/* サービスカラー帯 */
.featured-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--navy), var(--gold));
}
.featured-card { position: relative; }

.featured-thumb {
  background: linear-gradient(145deg, #0a1c3d 0%, #0d2d6e 50%, #0a1e52 100%);
  min-height: 0; position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center; padding: 36px;
}
a.featured-thumb {
  display: flex; padding: 0; align-items: center; justify-content: center;
  transition: opacity .25s;
}
a.featured-thumb:hover { opacity: .92; }
.featured-thumb-img {
  position: relative; inset: auto;
  display: block;
  width: 100%; height: auto;
  max-height: 100%;
  object-fit: contain; object-position: center;
}
a.featured-thumb::before,
a.featured-thumb::after { display: none; }
/* 幾何学グリッド装飾 */
.featured-thumb::before {
  content: '';
  position: absolute; inset: 0;
  background:
    repeating-linear-gradient(0deg, transparent, transparent 47px, rgba(255,255,255,.04) 48px),
    repeating-linear-gradient(90deg, transparent, transparent 47px, rgba(255,255,255,.04) 48px);
}
.featured-thumb::after {
  content: '';
  position: absolute; top: -40px; right: -40px;
  width: 220px; height: 220px; border-radius: 50%;
  border: 1px solid rgba(200,160,32,.15);
}
.featured-thumb-content { position: relative; z-index: 2; }
.featured-industry {
  font-family: 'Montserrat', sans-serif; font-size: 11px; font-weight: 500;
  color: rgba(255,255,255,.5); letter-spacing: .16em; margin-bottom: 12px;
}
.featured-thumb-num {
  font-family: 'Cormorant Garamond', serif; font-size: 80px; font-weight: 300;
  color: rgba(255,255,255,.08); line-height: 1; position: absolute;
  top: 20px; left: 24px; user-select: none;
}
.featured-result-big {
  font-family: 'Cormorant Garamond', serif; font-size: 52px; font-weight: 300;
  color: var(--white); line-height: 1;
}
.featured-result-big span { font-size: 22px; font-family: 'Noto Sans JP', sans-serif; font-weight: 500; }
.featured-result-label { font-size: 12px; color: rgba(255,255,255,.55); margin-top: 6px; letter-spacing: .06em; }

.featured-body { padding: 44px 44px 40px; display: flex; flex-direction: column; justify-content: space-between; }
.featured-srv-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 500;
  color: var(--navy-link); background: rgba(7,9,80,.07);
  border: 1px solid rgba(7,9,80,.15); padding: 4px 12px;
  border-radius: 2px; letter-spacing: .12em; margin-bottom: 20px;
}
.featured-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(18px, 2vw, 22px); font-weight: 600;
  color: var(--navy-ink); line-height: 1.65; letter-spacing: .04em;
  margin-bottom: 20px;
}
.featured-desc { font-size: 14px; color: var(--text-secondary); line-height: 2.1; margin-bottom: 28px; flex: 1; }
.featured-platform {
  padding: 20px 0; border-top: 1px solid rgba(7,9,80,.08);
  margin-bottom: 28px;
}
.featured-platform-tag {
  font-size: 12px; color: var(--text-muted);
  letter-spacing: .04em; margin-bottom: 10px;
}
.featured-platform-name {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(16px, 1.8vw, 20px); font-weight: 600;
  color: var(--navy-ink); letter-spacing: .04em; line-height: 1.5;
}
.featured-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 500; color: var(--navy-link);
  letter-spacing: .06em; transition: gap .2s;
}
.featured-link:hover { gap: 12px; }
.featured-link::after { content: '→'; }

/* ============================================================
   CASES GRID
   ============================================================ */
.cases-section {
  background: var(--off-white);
  padding: 56px 40px 100px;
}
.cases-inner { max-width: 1280px; margin: 0 auto; }

/* 件数表示＋並び替え */
.cases-meta {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 32px; flex-wrap: wrap; gap: 12px;
}
.cases-count {
  font-size: 13px; color: var(--text-secondary);
}
.cases-count strong { color: var(--navy-ink); font-size: 20px; font-family: 'Cormorant Garamond', serif; font-weight: 400; }
.cases-sort { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-muted); }
.cases-sort select { border: 1px solid rgba(7,9,80,.12); border-radius: var(--radius-sm); padding: 5px 10px; font-size: 12px; color: var(--text-secondary); background: var(--white); outline: none; cursor: pointer; font-family: 'Noto Sans JP', sans-serif; }

/* カードグリッド */
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

/* 個別ケースカード */
.case-card {
  background: var(--white);
  border: 1px solid rgba(7,9,80,.08);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex; flex-direction: column;
  position: relative;
  text-decoration: none;
  color: inherit;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: rgba(7,9,80,.16); }
/* サービス別トップライン */
.case-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  transition: opacity .3s;
}
.case-card.srv-ai::before { background: linear-gradient(90deg, var(--c-ai), #2a6fd0); }
.case-card.srv-hr::before { background: linear-gradient(90deg, var(--c-hr), var(--gold-light)); }
.case-card.srv-en::before { background: linear-gradient(90deg, var(--c-en), #17a890); }

/* サムネイル */
.case-thumb {
  height: 180px; position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 10px;
}
.case-thumb-inner { position: relative; z-index: 2; text-align: center; }
.case-thumb-icon { margin: 0 auto 8px; }
.case-thumb-industry { font-size: 11px; font-weight: 500; letter-spacing: .12em; font-family: 'Montserrat', sans-serif; }
.case-thumb.srv-ai { background: linear-gradient(145deg, #d8e8f8 0%, #b8d0f0 100%); }
.case-thumb.srv-ai .case-thumb-industry { color: var(--navy-link); }
.case-thumb.srv-hr { background: linear-gradient(145deg, #f8f0d8 0%, #f0e0b8 100%); }
.case-thumb.srv-hr .case-thumb-industry { color: #7a5800; }
.case-thumb.srv-en { background: linear-gradient(145deg, #d0ede8 0%, #a8d8d0 100%); }
.case-thumb.srv-en .case-thumb-industry { color: var(--teal); }

/* サムネイルのグラデーションオーバーレイ */
.case-thumb::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,.06) 100%);
}
/* 成果数値のサムネイル表示 */
.case-thumb-result {
  position: absolute; bottom: 12px; right: 14px; z-index: 3;
  font-family: 'Cormorant Garamond', serif; font-size: 36px; font-weight: 300;
  line-height: 1; opacity: .18;
}
.case-thumb.srv-ai .case-thumb-result { color: var(--navy-link); }
.case-thumb.srv-hr .case-thumb-result { color: #7a5800; }
.case-thumb.srv-en .case-thumb-result { color: var(--teal); }

/* カード本文 */
.case-body { padding: 24px 24px 20px; flex: 1; display: flex; flex-direction: column; }
.case-tags { display: flex; gap: 5px; margin-bottom: 13px; flex-wrap: wrap; }
.case-tag {
  font-size: 10px; padding: 2px 10px; border-radius: 2px; letter-spacing: .04em;
  font-family: 'Montserrat', sans-serif; font-weight: 500;
}
.case-tag.srv-ai { color: var(--navy-link); background: rgba(7,9,80,.07); border: 1px solid rgba(7,9,80,.14); }
.case-tag.srv-hr { color: #7a5800; background: rgba(200,160,32,.1); border: 1px solid rgba(200,160,32,.2); }
.case-tag.srv-en { color: var(--teal); background: rgba(10,122,106,.08); border: 1px solid rgba(10,122,106,.18); }
.case-tag.industry { color: var(--text-muted); background: var(--off-white); border: 1px solid rgba(7,9,80,.08); }

.case-title {
  font-size: 14px; font-weight: 500; color: var(--text-primary);
  line-height: 1.7; margin-bottom: 12px; flex: 1;
}
.case-result {
  font-size: 12px; font-weight: 500;
  border-top: 1px solid rgba(7,9,80,.07);
  padding-top: 14px; margin-top: auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px;
}
.case-result-text { color: var(--navy-link); letter-spacing: .03em; line-height: 1.6; flex: 1; }
.case-result-arrow {
  flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%;
  background: rgba(7,9,80,.06); border: 1px solid rgba(7,9,80,.12);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; color: var(--navy-link); transition: background .2s, transform .2s;
}
.case-card:hover .case-result-arrow { background: var(--navy); color: var(--white); transform: translateX(2px); }

/* 非表示カード */
.case-card.hidden { display: none; }

/* ============================================================
   NO RESULTS
   ============================================================ */
.no-results {
  grid-column: 1 / -1;
  text-align: center; padding: 80px 40px;
  display: none;
}
.no-results.show { display: block; }
.no-results-icon { font-size: 48px; margin-bottom: 16px; opacity: .3; }
.no-results-text { font-size: 15px; color: var(--text-muted); }

/* ============================================================
   INDUSTRY BROWSE
   ============================================================ */
.industry-section {
  background: var(--white);
  padding: 80px 40px;
  border-top: 1px solid rgba(7,9,80,.07);
}
.industry-inner { max-width: 1280px; margin: 0 auto; }
.industry-header { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 40px; }
.section-tag { display: inline-block; font-size: 10px; font-weight: 500; color: var(--gold); letter-spacing: .22em; margin-bottom: 10px; font-family: 'Montserrat', sans-serif; }
.section-title { font-family: 'Noto Serif JP', serif; font-size: clamp(20px, 2.5vw, 28px); font-weight: 600; color: var(--navy-ink); line-height: 1.4; letter-spacing: .04em; }

.industry-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.industry-card {
  border: 1px solid rgba(7,9,80,.1);
  border-radius: var(--radius-md); padding: 24px 20px;
  display: flex; align-items: center; gap: 16px;
  cursor: pointer; transition: border-color .2s, background .2s, transform .2s;
  background: var(--white);
}
.industry-card:hover { border-color: rgba(7,9,80,.28); background: rgba(7,9,80,.02); transform: translateY(-2px); }
.industry-icon {
  width: 44px; height: 44px; border-radius: var(--radius-md);
  background: rgba(7,9,80,.07); display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.industry-name { font-size: 14px; font-weight: 500; color: var(--text-primary); letter-spacing: .03em; }
.industry-count { font-size: 11px; color: var(--text-muted); margin-top: 2px; }

/* ============================================================
   CTA BAND
   ============================================================ */
.cta-band { background: linear-gradient(135deg, var(--navy-deep) 0%, var(--navy-dark) 42%, var(--navy-mid) 72%, var(--navy) 100%); padding: 100px 40px; position: relative; overflow: hidden; }
.cta-band::before { content: ''; position: absolute; top: -80px; right: -80px; width: 380px; height: 380px; border-radius: 50%; border: 1px solid rgba(255,255,255,.05); }
.cta-band::after { content: ''; position: absolute; bottom: -100px; left: -50px; width: 300px; height: 300px; border-radius: 50%; background: rgba(200,160,32,.05); }
.cta-inner { max-width: 860px; margin: 0 auto; text-align: center; position: relative; z-index: 2; }
.cta-tag-el { display: inline-block; font-size: 10px; font-weight: 500; color: var(--gold); letter-spacing: .22em; margin-bottom: 20px; font-family: 'Montserrat', sans-serif; }
.cta-title { font-family: 'Noto Serif JP', serif; font-size: calc(clamp(23px, 3vw, 36px) * 0.9); font-weight: 600; color: var(--white); line-height: 1.55; margin-bottom: calc(20px + 1em); letter-spacing: .04em; }
.cta-sub { font-size: 14px; color: rgba(255,255,255,.68); margin-bottom: 52px; line-height: 2.1; }
.cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-cta-w { font-size: 13px; font-weight: 500; color: var(--navy-ink); background: var(--white); border: none; padding: 16px 32px; border-radius: var(--radius-sm); cursor: pointer; letter-spacing: .07em; transition: transform .15s, background .2s; }
.btn-cta-w:hover { background: #eef3ff; transform: translateY(-2px); }
.btn-cta-o { font-size: 13px; color: var(--white); background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.32); padding: 15px 32px; border-radius: var(--radius-sm); cursor: pointer; letter-spacing: .07em; transition: transform .15s, background .2s; }
.btn-cta-o:hover { background: rgba(255,255,255,.14); transform: translateY(-2px); }
.btn-cta-g { font-size: 13px; font-weight: 500; color: var(--navy-ink); background: var(--gold); border: none; padding: 16px 32px; border-radius: var(--radius-sm); cursor: pointer; letter-spacing: .07em; transition: transform .15s, background .2s; }
.btn-cta-g:hover { background: var(--gold-light); transform: translateY(-2px); }

/* ============================================================
   FOOTER
   ============================================================ */
footer { background: var(--navy-deep); padding: 72px 40px 0; }
.footer-inner { max-width: 1280px; margin: 0 auto; display: grid; grid-template-columns: 2.2fr 1fr 1fr 1fr; gap: 44px; padding-bottom: 56px; border-bottom: 1px solid rgba(255,255,255,.07); }
.footer-brand-name { font-family: 'Cormorant Garamond', serif; font-size: 20px; color: var(--white); letter-spacing: .06em; margin-bottom: 4px; }
.footer-brand-ja { font-size: 10px; color: rgba(255,255,255,.36); letter-spacing: .12em; margin-bottom: 22px; }
.footer-addr { font-size: 12px; color: rgba(255,255,255,.46); line-height: 2; font-style: normal; }
.footer-cert { margin-top: 18px; font-size: 11px; color: rgba(255,255,255,.38); line-height: 1.7; border-top: 1px solid rgba(255,255,255,.07); padding-top: 16px; }
.fcol-title { font-size: 10px; font-weight: 500; color: rgba(255,255,255,.4); letter-spacing: .16em; margin-bottom: 18px; font-family: 'Montserrat', sans-serif; }
.flinks { display: flex; flex-direction: column; gap: 11px; }
.flink { font-size: 13px; color: rgba(255,255,255,.6); transition: color .2s; }
.flink:hover { color: var(--white); }
.footer-bottom { max-width: 1280px; margin: 0 auto; padding: 22px 0; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.footer-copy { font-size: 11px; color: rgba(255,255,255,.26); letter-spacing: .04em; }
.footer-sns { display: flex; gap: 10px; }
.footer-bottom .footer-sns { gap: 18px; }
.footer-bottom .footer-sns a:not(.social-btn) { font-size: 11px; color: rgba(255,255,255,.36); transition: color .2s; letter-spacing: .06em; }
.footer-bottom .footer-sns a:not(.social-btn):hover { color: rgba(255,255,255,.8); }

/* ============================================================
   REVEAL
   ============================================================ */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }
.d1 { transition-delay: .08s; } .d2 { transition-delay: .16s; }
.d3 { transition-delay: .24s; } .d4 { transition-delay: .32s; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1100px) {
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 960px) {
  .featured-card { grid-template-columns: 1fr; }
  .featured-thumb { min-height: 0; }
  .filter-inner { padding: 8px 0; }
  .filter-group { padding: 0 14px 0 0; margin-right: 14px; }
}
@media (max-width: 860px) {
  nav { display: none; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .stat-item { padding: 4px 24px; }
}
@media (max-width: 640px) {
  .cases-grid { grid-template-columns: 1fr; }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .featured-results { grid-template-columns: 1fr 1fr; }
  .filter-section { padding: 0 20px; }
  .filter-inner { flex-direction: column; align-items: flex-start; gap: 4px; padding: 10px 0; }
  .filter-group { border-right: none; padding: 0; margin: 0; }
  .filter-search { max-width: 100%; width: 100%; }
  .page-hero, .featured-section, .cases-section, .industry-section { padding-left: 20px; padding-right: 20px; }
  .breadcrumb { padding-left: 20px; padding-right: 20px; }
  .header-inner { padding: 0 20px; }
  .footer-inner { grid-template-columns: 1fr; }
  .cta-band { padding-left: 20px; padding-right: 20px; }
  .cta-btns { flex-direction: column; align-items: stretch; }
  .featured-body { padding: 28px; }
}