/*
 * casestudy-index.css — 事例トップ専用の編集記事トーン調整
 * 個別事例ページの落ち着いた方向性に合わせつつ、一覧の入口としての視認性を補う。
 */

.casestudy-index-page .case-hero {
  padding: 72px 0 64px;
  background:
    radial-gradient(circle at 78% 22%, rgba(72,128,194,0.2) 0, rgba(72,128,194,0.08) 28%, transparent 48%),
    linear-gradient(135deg, #ffffff 0%, #f8faff 52%, #eef4ff 100%);
}

.casestudy-index-page .case-hero::before {
  content: '';
  position: absolute;
  right: max(24px, calc((100vw - var(--container-max)) / 2 + 24px));
  top: 58px;
  width: 280px;
  height: 190px;
  border: 1px solid rgba(26,40,136,0.13);
  border-radius: 12px;
  background:
    linear-gradient(rgba(26,40,136,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26,40,136,0.05) 1px, transparent 1px),
    rgba(255,255,255,0.72);
  background-size: 24px 24px;
  box-shadow: 0 18px 48px rgba(15,23,42,0.08);
}

.casestudy-index-page .case-hero::after {
  content: 'CLOSED AI / NETWORK / CLOUD / VOICE';
  position: absolute;
  right: max(46px, calc((100vw - var(--container-max)) / 2 + 46px));
  top: 102px;
  width: 224px;
  padding: 18px 18px 16px;
  border-radius: 8px;
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(26,40,136,0.12);
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.9;
  letter-spacing: 0.06em;
  box-shadow: 0 10px 30px rgba(15,23,42,0.06);
}

.casestudy-index-page .case-hero__copy {
  position: relative;
  max-width: 780px;
  padding-left: 24px;
  border-left: 4px solid rgba(26,40,136,0.18);
}

.casestudy-index-page .case-hero h1 {
  font-size: 39px;
  line-height: 1.42;
}

.casestudy-index-page .case-hero__lead {
  max-width: 740px;
}

.casestudy-index-page .case-hero__actions .case-button,
.casestudy-index-page .case-hero__actions .case-button--ghost {
  min-height: auto;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--primary);
  font-size: 14px;
  text-decoration: underline;
  text-underline-offset: 5px;
  box-shadow: none;
}

.casestudy-index-page .case-hero__actions .case-button::after {
  content: '↓';
  margin-left: 6px;
}

.casestudy-index-page .case-hero__actions .case-button--ghost::after {
  content: '→';
  margin-left: 6px;
}

.casestudy-index-page .case-hero__actions .case-button:hover,
.casestudy-index-page .case-hero__actions .case-button--ghost:hover {
  background: transparent;
  color: var(--primary-hover);
}

.casestudy-index-page #featured {
  padding-top: 64px;
}

.casestudy-index-page #featured .case-section__head {
  margin-bottom: 28px;
}

.casestudy-index-page .case-feature-card {
  position: relative;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  border-radius: 10px;
  background: linear-gradient(135deg, #ffffff 0%, #fbfcff 100%);
  box-shadow: 0 16px 42px rgba(15,23,42,0.06);
}

.casestudy-index-page .case-feature-card::before {
  content: 'Featured';
  position: absolute;
  top: 22px;
  right: 24px;
  color: rgba(26,40,136,0.18);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.casestudy-index-page .case-feature-card__visual {
  background:
    radial-gradient(circle at 80% 18%, rgba(72,128,194,0.2), transparent 34%),
    #f4f7fb;
}

.casestudy-index-page .case-diagram-node {
  box-shadow: 0 8px 24px rgba(15,23,42,0.04);
}

.casestudy-index-page .case-section--muted {
  background: #f8fafc;
}

.casestudy-index-page .case-card {
  border-radius: 8px;
  box-shadow: none;
}

@media (max-width: 920px) {
  .casestudy-index-page .case-hero::before,
  .casestudy-index-page .case-hero::after,
  .casestudy-index-page .case-feature-card::before {
    display: none;
  }
}

@media (max-width: 640px) {
  .casestudy-index-page .case-hero {
    padding: 44px 0 38px;
  }

  .casestudy-index-page .case-hero__copy {
    padding-left: 18px;
  }

  .casestudy-index-page .case-hero h1 {
    font-size: 29px;
  }
}