/* splight AI News — 新ブランド（尾道デニム×夕陽 / M PLUS 2）2026-08-29 全面改訂
 * 本体サイト design.md（dev/splight-ai-static）に準拠。旧emerald/navy版を置換 */

:root {
  --sai-paper: #ffffff;
  --sai-paper-warm: #fdfaf3;
  --sai-ink: #1f2321;
  --sai-ink-soft: #565b58;
  --sai-ink-faint: #7d827e;
  --sai-denim: #c74309;
  --sai-denim-deep: #2f2418;
  --sai-grad: linear-gradient(120deg, #ffc233, #f4645f);
  --sai-chip-bg: #fdf3d9;
  --sai-chip-line: #f0d68a;
  --sai-line: #e7e5e0;
  --sai-font-disp: "M PLUS 2", "Hiragino Kaku Gothic ProN", sans-serif;
  --sai-font-body: "IBM Plex Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

body {
  background: var(--sai-paper);
  color: var(--sai-ink);
  font-family: var(--sai-font-body);
  letter-spacing: 0.01em;
}
h1, h2, h3, h4, .wp-block-heading { font-family: var(--sai-font-disp); font-weight: 800; letter-spacing: 0.02em; }
a { color: var(--sai-denim); }
a:hover { color: var(--sai-denim-deep); }

/* ---------- ロゴ（テキスト版） ---------- */
.sai-logo-dot {
  display: inline-block;
  width: 15px; height: 15px;
  border-radius: 50%;
  background: var(--sai-grad);
  vertical-align: -1px;
  margin-right: 9px;
}
.sai-logo-text {
  font-family: var(--sai-font-disp);
  font-weight: 800;
  font-size: 19px;
  color: var(--sai-ink);
  letter-spacing: 0.01em;
}
.sai-logo-text em { font-style: normal; color: var(--sai-denim); }

/* ---------- ヘッダー ---------- */
.sai-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 18px rgba(31, 35, 33, 0.07);
}
.sai-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.sai-header__logo { text-decoration: none; display: inline-flex; align-items: center; }
.sai-nav { display: flex; align-items: center; gap: 26px; }
.sai-nav a {
  color: var(--sai-ink);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 4px 0;
  position: relative;
}
.sai-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: -2px;
  height: 2px;
  border-radius: 2px;
  background: var(--sai-grad);
  transition: right 0.3s ease;
}
.sai-nav a:hover::after { right: 0; }
.sai-nav a[aria-current="page"] { color: var(--sai-denim-deep); font-weight: 700; }
.sai-cta {
  display: inline-block;
  background: var(--sai-ink);
  color: #fff !important;
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 700;
  border-radius: 999px;
  padding: 11px 26px;
  transition: background 0.25s;
}
.sai-cta:hover { background: var(--sai-denim-deep); }
.sai-cta--nav { display: none; }
.sai-hamburger { display: none; font-size: 22px; cursor: pointer; color: var(--sai-ink); }

@media (max-width: 900px) {
  .sai-header { backdrop-filter: none; background: #fff; }
  .sai-cta--pc { display: none; }
  .sai-hamburger { display: block; }
  .sai-nav {
    position: fixed;
    inset: 0;
    top: 58px;
    background: #fff;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 40px;
    gap: 28px;
    font-size: 17px;
    display: none;
  }
  .sai-nav-toggle:checked ~ .sai-header__inner .sai-nav { display: flex; }
  .sai-cta--nav { display: inline-block; }
}

/* ---------- ブログ見出し・一覧 ---------- */
.sai-blog-main { padding-top: 44px; }
.sai-blog-heading__title { font-size: clamp(30px, 4.4vw, 44px); }
.sai-blog-heading__en {
  background: var(--sai-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.sai-blog-heading__sub { color: var(--sai-ink-soft); font-size: 14.5px; }

.sai-blog-cats { margin-top: 18px; }
.sai-cat-list { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; padding: 0; }
.sai-cat-list li a {
  display: inline-block;
  background: var(--sai-chip-bg);
  border: 1px solid var(--sai-chip-line);
  color: var(--sai-ink);
  border-radius: 999px;
  padding: 4px 16px;
  font-size: 12.5px;
  font-weight: 700;
  text-decoration: none;
}
.sai-cat-list li a:hover { background: var(--sai-denim); border-color: var(--sai-denim); color: #fff; }

.sai-card {
  border: 1px solid var(--sai-line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--sai-paper);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.sai-card:hover { transform: translateY(-4px); box-shadow: 0 14px 36px rgba(31, 35, 33, 0.12); }
.sai-card__thumb img { border-radius: 0; }
.sai-card__body { padding: 18px 20px 22px; }
.sai-card__cats a {
  background: var(--sai-chip-bg);
  border: 1px solid var(--sai-chip-line);
  color: var(--sai-ink);
  border-radius: 999px;
  padding: 2px 12px;
  font-size: 11px;
  font-weight: 700;
  text-decoration: none;
}
.sai-card__date { color: var(--sai-ink-faint); font-size: 12.5px; }
.sai-card .wp-block-post-title, .sai-card__title { font-size: 17px; line-height: 1.75; margin: 10px 0 0; }
.sai-card__title a, .sai-card h2 a, .sai-card h3 a { color: var(--sai-ink); text-decoration: none; font-family: var(--sai-font-disp); font-weight: 800; font-size: 17px; line-height: 1.75; }
.sai-card__title a:hover { color: var(--sai-denim); }
.sai-card__excerpt, .sai-card p { color: var(--sai-ink-soft); font-size: 13.5px; }

/* ページネーション */
.wp-block-query-pagination a, .wp-block-query-pagination-numbers .page-numbers {
  color: var(--sai-ink);
  text-decoration: none;
  border: 1px solid var(--sai-line);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
}
.wp-block-query-pagination .current { background: var(--sai-denim); border-color: var(--sai-denim); color: #fff; }
.wp-block-query-pagination a:hover { background: var(--sai-paper-warm); }

/* ---------- 記事ページ ---------- */
.wp-block-post-title { font-size: clamp(26px, 3.6vw, 38px); line-height: 1.55; }
.wp-block-post-content { font-size: 16px; line-height: 1.95; color: var(--sai-ink); }
.wp-block-post-content h2 {
  margin-top: 2.2em;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--sai-chip-line);
  font-size: clamp(20px, 2.6vw, 26px);
}
.wp-block-post-content h3 { margin-top: 1.8em; font-size: clamp(17px, 2.2vw, 21px); }
.wp-block-post-content a { color: var(--sai-denim); }
.wp-block-post-content blockquote {
  border-left: 3px solid var(--sai-denim);
  background: var(--sai-paper-warm);
  padding: 12px 18px;
  border-radius: 0 8px 8px 0;
}
.wp-block-post-content img { border-radius: 12px; }
.wp-block-post-content pre { border-radius: 10px; }
.wp-block-post-content table { border-collapse: collapse; }
.wp-block-post-content th { background: var(--sai-paper-warm); }
.wp-block-post-content th, .wp-block-post-content td { border: 1px solid var(--sai-line); padding: 8px 12px; }

/* ---------- フッター ---------- */
.sai-footer { background: var(--sai-denim-deep); color: #fff; margin-top: 80px; }
.sai-footer a { color: #f3e6cf; text-decoration: none; }
.sai-footer a:hover { color: #fff; text-decoration: underline; }
.sai-footer__inner { max-width: 1200px; margin: 0 auto; padding: 52px 24px 30px; }
.sai-footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; }
.sai-footer__brand .sai-logo-text { color: #fff; }
.sai-footer__brand .sai-logo-text em { color: #ffc233; }
.sai-footer__brand address { font-style: normal; margin-top: 14px; font-size: 12.5px; line-height: 1.9; color: #e0cfae; }
.sai-footer__h { font-size: 13px; font-weight: 700; letter-spacing: 0.08em; color: #c8b48d; margin-bottom: 10px; }
.sai-footer__col ul { list-style: none; padding: 0; margin: 0; }
.sai-footer__col li { margin-bottom: 8px; font-size: 13.5px; }
.sai-footer__copy {
  margin-top: 40px;
  text-align: center;
  font-family: var(--sai-font-disp);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: #c8b48d;
}
@media (max-width: 900px) {
  .sai-footer__grid { grid-template-columns: 1fr 1fr; }
  .sai-footer__brand { grid-column: 1 / -1; }
}

/* ---------- 一覧カード改善（2026-08-30: チップ非表示・全面クリック・続きを読む縮小） ---------- */
.sai-card { position: relative; }
.sai-card__readmore { font-size: 12px; }
.sai-card__readmore a { font-size: 12px; }
.sai-card__excerpt, .sai-card__body p { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.sai-card .wp-block-post-title a::after, .sai-card__title a::after { content: ""; position: absolute; inset: 0; z-index: 1; }

/* ---------- カテゴリページの表記整理（2026-08-30） ---------- */
.sai-archive-heading__title { font-size: clamp(26px, 3.4vw, 36px); }
.sai-archive-heading__desc { margin-top: 8px; font-size: 14px; color: var(--sai-ink-soft); }
.sai-breadcrumb { margin-top: 18px; gap: 8px; align-items: center; }
.sai-breadcrumb p, .sai-breadcrumb .wp-block-query-title { font-size: 12.5px !important; font-weight: 500; font-family: var(--sai-font-body); letter-spacing: 0; margin: 0; color: var(--sai-ink-faint); }
.sai-breadcrumb a { color: var(--sai-denim); text-decoration: none; }
.sai-breadcrumb a:hover { text-decoration: underline; }
.sai-blog-cats { margin-top: 20px; }

/* コピー用プロンプト枠（2026-08-30） */
.sai-copy { background: #f6f7fb; border: 1px solid #b9c5ec; border-left: 4px solid #35509e; border-radius: 10px; padding: 16px 18px; margin: 18px 0; position: relative; }
.sai-copy::before { content: "コピーして使う"; position: absolute; top: -10px; left: 14px; background: #35509e; color: #fff; font-size: 11px; font-weight: 700; padding: 2px 10px; border-radius: 6px; letter-spacing: 0.04em; }
.sai-copy p { margin: 0; font-size: 14px; line-height: 1.9; white-space: pre-wrap; }
.sai-copy p + p { margin-top: 1.9em; }

/* 記事内図解（2026-08-30） */
.wp-block-post-content .sai-diagram img { border-radius: 12px; border: 1px solid #e7e5e0; }