/* ============================================================
   E-Space Blog — shared styles
   設計指針: LPのカラーシステム/フォントを継承しつつ、
   ブログ特有の長文読み物に最適化したタイポグラフィを定義
============================================================ */

:root {
  --es-primary: #4F7DFF;
  --es-primary-d: #3558C7;
  --es-yellow: #FFC53D;
  --es-pink: #FF6B9D;
  --es-green: #4ECB71;
  --es-bg: #FAFAF7;
  --es-bg-2: #F5F5F0;
  --es-card: #FFFFFF;
  --es-text: #1A2138;
  --es-text-2: #6B7280;
  --es-border: rgba(26, 33, 56, 0.08);
  --es-radius-sm: 12px;
  --es-radius: 20px;
  --es-radius-lg: 32px;
  --es-shadow-sm: 0 2px 8px rgba(26, 33, 56, 0.06);
  --es-shadow: 0 12px 32px -8px rgba(26, 33, 56, 0.12);
  --es-shadow-lg: 0 24px 60px -12px rgba(26, 33, 56, 0.18);
  --es-font-jp: "M PLUS Rounded 1c", "Hiragino Maru Gothic ProN", "Hiragino Sans", sans-serif;
  --es-font-en: "DM Sans", "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body {
  margin: 0; padding: 0;
  background: var(--es-bg);
  color: var(--es-text);
  font-family: var(--es-font-jp);
  font-feature-settings: "palt";
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ============================================================
   ヘッダー（LPと同一）
============================================================ */
.es-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 250, 247, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--es-border);
}
.es-header-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; gap: 32px;
  padding: 16px 32px;
}
.es-logo {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 18px;
  font-family: var(--es-font-en);
  letter-spacing: -0.02em;
}
.es-logo-mark-img img { width: 28px; height: 28px; border-radius: 8px; }
.es-nav { display: flex; gap: 24px; margin-left: 16px; }
.es-nav a {
  font-size: 14px; font-weight: 600;
  color: var(--es-text-2);
  transition: color .15s ease;
}
.es-nav a:hover { color: var(--es-text); }
.es-nav a.is-active { color: var(--es-primary); }
.es-header-cta { margin-left: auto; display: flex; align-items: center; gap: 12px; }

.es-btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 12px 22px;
  border-radius: 999px;
  font-weight: 700; font-size: 15px;
  cursor: pointer; border: none;
  font-family: inherit;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  white-space: nowrap;
}
.es-btn-lg { padding: 16px 28px; font-size: 16px; }
.es-btn-md { padding: 10px 16px; font-size: 14px; gap: 6px; }
.es-btn-primary {
  background: var(--es-primary); color: #fff;
  box-shadow: 0 6px 18px -4px rgba(79, 125, 255, 0.45);
}
.es-btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 24px -4px rgba(79, 125, 255, 0.55); }
.es-btn-yellow {
  background: var(--es-yellow); color: var(--es-text);
  box-shadow: 0 6px 18px -4px rgba(255, 197, 61, 0.5);
}
.es-btn-yellow:hover { transform: translateY(-1px); }
.es-btn-secondary {
  background: #fff; color: var(--es-text);
  border: 1.5px solid var(--es-border);
}
.es-btn-secondary:hover { border-color: var(--es-text); }

/* ============================================================
   ブログ index（一覧ページ）
============================================================ */
.blog-hero {
  padding: 80px 32px 56px;
  background: linear-gradient(180deg, var(--es-bg) 0%, var(--es-bg-2) 100%);
  text-align: center;
}
.blog-hero-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(79, 125, 255, 0.1);
  color: var(--es-primary);
  font-size: 13px; font-weight: 700;
  font-family: var(--es-font-en);
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}
.blog-hero-title {
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}
.blog-hero-sub {
  font-size: 16px;
  color: var(--es-text-2);
  margin: 0 auto;
  max-width: 560px;
  line-height: 1.85;
}
.blog-list {
  max-width: 1080px;
  margin: 0 auto;
  padding: 56px 32px 96px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.blog-card {
  background: var(--es-card);
  border-radius: var(--es-radius);
  overflow: hidden;
  box-shadow: var(--es-shadow-sm);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: transform .2s ease, box-shadow .2s ease;
  border: 1px solid var(--es-border);
}
.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--es-shadow);
}
.blog-card-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--es-bg-2);
  overflow: hidden;
}
.blog-card-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.blog-card-thumb-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 32px;
}
.blog-card-thumb-blue {
  background: linear-gradient(135deg, #EAF1FF 0%, #C9D9FF 100%);
}
.blog-card-thumb-yellow {
  background: linear-gradient(135deg, #FFF7E8 0%, #FFE4A3 100%);
}
.blog-card-thumb-pink {
  background: linear-gradient(135deg, #FFE4ED 0%, #FFB8D0 100%);
}
.blog-card-thumb-emoji {
  font-size: 48px;
  line-height: 1;
}
.blog-card-thumb-label {
  font-size: 14px;
  font-weight: 800;
  color: var(--es-text);
  letter-spacing: -0.01em;
  text-align: center;
  line-height: 1.5;
}
.blog-card-body {
  padding: 24px 26px 28px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.blog-card-meta {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--es-text-2);
  font-family: var(--es-font-en);
  letter-spacing: 0.02em;
  margin-bottom: 10px;
}
.blog-card-tag {
  background: rgba(255, 197, 61, 0.18);
  color: #B58400;
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 700;
}
.blog-card-title {
  font-size: 19px;
  font-weight: 800;
  line-height: 1.5;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.blog-card-excerpt {
  font-size: 14px;
  color: var(--es-text-2);
  line-height: 1.85;
  margin: 0 0 16px;
  flex: 1;
}
.blog-card-readmore {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--es-primary);
  font-weight: 700;
  font-size: 14px;
}

/* ============================================================
   記事ページ
============================================================ */
.post-hero {
  padding: 64px 24px 32px;
  max-width: 760px;
  margin: 0 auto;
}
.post-meta {
  font-size: 13px;
  color: var(--es-text-2);
  font-family: var(--es-font-en);
  letter-spacing: 0.02em;
  margin-bottom: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}
.post-meta-tag {
  background: rgba(255, 197, 61, 0.18);
  color: #B58400;
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 700;
  font-family: var(--es-font-jp);
}
.post-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.4;
  margin: 0 0 24px;
}
.post-description {
  font-size: 16px;
  color: var(--es-text-2);
  line-height: 1.85;
  margin: 0;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--es-border);
}

.post-body {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 24px 56px;
}
.post-body h2 {
  font-size: 26px; font-weight: 800;
  margin: 64px 0 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--es-primary);
  letter-spacing: -0.01em;
  line-height: 1.4;
}
.post-body h2:first-child { margin-top: 0; }
.post-body h3 {
  font-size: 20px; font-weight: 700;
  margin: 40px 0 14px;
  letter-spacing: -0.01em;
}
.post-body p { margin: 0 0 22px; font-size: 16px; line-height: 1.95; }
.post-body strong { font-weight: 700; color: var(--es-text); }
.post-body ul, .post-body ol { padding-left: 1.6em; margin: 0 0 22px; }
.post-body li { margin-bottom: 10px; line-height: 1.85; }
.post-body hr { border: none; border-top: 1px solid var(--es-border); margin: 56px 0; }
.post-body a {
  color: var(--es-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}
.post-body a:hover { color: var(--es-primary-d); }
.post-body blockquote {
  margin: 28px 0;
  padding: 18px 22px;
  background: var(--es-bg-2);
  border-left: 4px solid var(--es-primary);
  border-radius: 4px 12px 12px 4px;
  color: var(--es-text-2);
  font-size: 15px;
}
.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 14px;
  background: var(--es-card);
  border-radius: var(--es-radius-sm);
  overflow: hidden;
  box-shadow: var(--es-shadow-sm);
}
.post-body th {
  background: var(--es-bg-2);
  padding: 14px 16px;
  text-align: left;
  font-weight: 700;
  font-size: 13px;
  border-bottom: 2px solid var(--es-border);
}
.post-body td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--es-border);
  vertical-align: top;
  line-height: 1.7;
}
.post-body tr:last-child td { border-bottom: none; }
.post-body tr:hover td { background: var(--es-bg); }
.post-body figure {
  margin: 36px 0 12px;
  text-align: center;
}
.post-body img {
  max-width: 100%;
  height: auto;
  margin: 36px auto 8px;
  border-radius: 12px;
  box-shadow: var(--es-shadow);
}
.post-body img.no-shadow {
  box-shadow: none;
  margin: 32px auto 16px;
}
.post-body .caption {
  display: block;
  text-align: center;
  font-size: 13px;
  color: var(--es-text-2);
  margin: 0 auto 36px;
}

/* 記事末尾CTA */
.post-cta {
  max-width: 760px;
  margin: 32px auto 0;
  padding: 40px 32px 48px;
  background: linear-gradient(135deg, #EAF1FF 0%, #FFF4D6 100%);
  border-radius: var(--es-radius);
  text-align: center;
}
.post-cta-title {
  font-size: 22px; font-weight: 800;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.post-cta-sub {
  font-size: 14px;
  color: var(--es-text-2);
  margin: 0 0 24px;
}

/* 関連記事 */
.post-related {
  max-width: 760px;
  margin: 56px auto 0;
  padding: 0 24px;
}
.post-related h3 {
  font-size: 18px; font-weight: 800;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}
.post-related-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.post-related-item {
  background: var(--es-card);
  border: 1px solid var(--es-border);
  border-radius: var(--es-radius-sm);
  padding: 18px 20px;
  text-decoration: none;
  color: inherit;
  transition: border-color .18s ease, transform .18s ease;
}
.post-related-item:hover {
  border-color: var(--es-primary);
  transform: translateY(-2px);
}
.post-related-item-meta {
  font-size: 12px;
  color: var(--es-text-2);
  font-family: var(--es-font-en);
  margin-bottom: 6px;
}
.post-related-item-title {
  font-size: 14px; font-weight: 700;
  line-height: 1.5;
  margin: 0;
}

/* ============================================================
   フッター（LPと同一）
============================================================ */
.es-footer { padding: 64px 32px 32px; background: var(--es-bg-2); margin-top: 96px; }
.es-footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 1.2fr 2fr;
  gap: 48px; padding-bottom: 40px;
  border-bottom: 1px solid var(--es-border);
}
.es-footer-brand .es-logo { margin-bottom: 16px; }
.es-footer-desc {
  color: var(--es-text-2);
  font-size: 14px; line-height: 1.8;
  margin: 0; white-space: pre-line;
}
.es-footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.es-footer-cols h5 { font-size: 13px; font-weight: 800; margin: 0 0 12px; letter-spacing: 0.05em; }
.es-footer-cols a {
  display: block; font-size: 14px;
  color: var(--es-text-2);
  padding: 6px 0;
  transition: color .15s;
}
.es-footer-cols a:hover { color: var(--es-text); }
.es-footer-bottom {
  max-width: 1200px;
  margin: 24px auto 0;
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--es-text-2);
}

@media (max-width: 900px) {
  .es-nav { display: none; }
  .es-header-inner { gap: 16px; padding: 14px 20px; }
  .es-header-cta { margin-left: auto; gap: 6px; flex-wrap: nowrap; }
  .es-header-cta .es-btn { padding: 10px 14px; font-size: 13px; }
  .blog-list { grid-template-columns: 1fr; padding: 40px 20px 64px; }
  .post-hero, .post-body, .post-related { padding-left: 20px; padding-right: 20px; }
  .post-related-list { grid-template-columns: 1fr; }
  .es-footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .es-footer-cols { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .post-body table { font-size: 13px; display: block; overflow-x: auto; }
}