/* ---------------------------------------------------------------------------
   コラム・記事・お問い合わせ・404 のスタイル。
   style.css → refine.css の後に読み込む。参考LPの配色・書体・余白の変数をそのまま使う。
   既存の style.css / refine.css は変更しない。
   --------------------------------------------------------------------------- */

/* パンくず */
.aibook-lp .breadcrumb {
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.aibook-lp .breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 16px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-size: 11px;
  color: var(--muted);
}
.aibook-lp .breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: #a7b7c0;
}
.aibook-lp .breadcrumb a:hover { color: var(--blue); }
.aibook-lp .breadcrumb [aria-current="page"] {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: min(100%, 560px);
}

/* 下層ページの見出し */
.aibook-lp .page-head { padding: 56px 0 8px; background: var(--paper); }
.aibook-lp .page-head h1 {
  font: 600 clamp(28px, 4vw, 42px)/1.55 var(--serif);
  letter-spacing: .03em;
  margin: 14px 0 20px;
}
.aibook-lp .page-head .lead {
  max-width: 800px;
  font-size: 15px;
  color: var(--muted);
  line-height: 2;
}
.aibook-lp .page-head .note { max-width: 800px; }
.aibook-lp .page-head + .section { padding-top: 56px; }
.aibook-lp .thanks-actions { margin-top: 32px !important; }
.aibook-lp .notfound-links {
  list-style: none;
  padding: 0;
  margin-top: 28px !important;
  display: grid;
  gap: 14px;
  font-size: 14px;
  font-weight: 700;
}
.aibook-lp .text-link-inline {
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  font-weight: 700;
}
.aibook-lp .text-link-inline:hover { color: var(--blue); border-color: var(--blue); }

/* 記事カード */
.aibook-lp .article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}
.aibook-lp .article-card { min-width: 0; }
.aibook-lp .article-card-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 26px 26px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--blue);
  transition: transform .2s, box-shadow .2s;
}
.aibook-lp .article-card-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px #13253618;
}
.aibook-lp .article-card-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 10px;
  color: var(--muted);
}
.aibook-lp .article-card-category {
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--blue);
}
.aibook-lp .article-card h3 {
  font-size: 17px;
  line-height: 1.75;
  margin: 14px 0 12px;
}
.aibook-lp .article-card-desc {
  font-size: 13px;
  line-height: 1.95;
  color: var(--muted);
  flex: 1;
}
.aibook-lp .article-card-more {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
  font-size: 12px;
  font-weight: 700;
  color: var(--blue);
}

/* コラム一覧 */
.aibook-lp .column-list { padding-top: 48px; }
.aibook-lp .empty-state {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 40px 32px;
  font-size: 14px;
  line-height: 2.1;
  color: var(--muted);
  text-align: center;
}
.aibook-lp .column-cta { padding: 72px 0; }
.aibook-lp .column-more { margin-top: 32px !important; }
.aibook-lp .column-empty { margin-top: 8px !important; }

/* 記事本文 */
.aibook-lp .article { padding: 48px 0 0; }
.aibook-lp .article-container { max-width: 800px; }
.aibook-lp .article-header { border-bottom: 1px solid var(--line); padding-bottom: 28px; }
.aibook-lp .article-category {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .11em;
  color: var(--blue);
}
.aibook-lp .article h1 {
  font: 600 clamp(26px, 3.6vw, 36px)/1.6 var(--serif);
  letter-spacing: .03em;
  margin: 14px 0 20px;
}
.aibook-lp .article-summary { font-size: 14px; line-height: 2; color: var(--muted); }
.aibook-lp .article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 24px 0 0;
  font-size: 11px;
  color: var(--muted);
}
.aibook-lp .article-meta > div { display: flex; gap: 8px; }
.aibook-lp .article-meta dt { font-weight: 700; }
.aibook-lp .article-meta dd { margin: 0; }

/* 目次 */
.aibook-lp .toc {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 24px 28px;
  margin-top: 32px;
}
.aibook-lp .toc-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  margin-bottom: 14px !important;
}
.aibook-lp .toc ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
  font-size: 13px;
  line-height: 1.8;
}
.aibook-lp .toc a { border-bottom: 1px solid transparent; }
.aibook-lp .toc a:hover { color: var(--blue); border-color: var(--blue); }
.aibook-lp .toc .toc-depth-3 { padding-left: 1.2em; font-size: 12px; color: var(--muted); }

/* 本文 */
.aibook-lp .article-body { margin-top: 40px; font-size: 15px; line-height: 2.1; }
.aibook-lp .article-body h2 {
  font: 600 24px/1.7 var(--serif);
  letter-spacing: .03em;
  margin: 56px 0 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 110px;
}
.aibook-lp .article-body h3 {
  font-size: 18px;
  line-height: 1.8;
  margin: 36px 0 14px;
  scroll-margin-top: 110px;
}
.aibook-lp .article-body h4 { font-size: 16px; margin: 28px 0 12px; }
.aibook-lp .article-body p { margin: 18px 0; }
.aibook-lp .article-body ul,
.aibook-lp .article-body ol { margin: 18px 0; padding-left: 1.5em; }
.aibook-lp .article-body li { margin: 8px 0; }
.aibook-lp .article-body a {
  color: var(--blue);
  border-bottom: 1px solid currentColor;
  overflow-wrap: anywhere;
}
.aibook-lp .article-body strong { font-weight: 700; }
.aibook-lp .article-body blockquote {
  margin: 24px 0;
  padding: 18px 24px;
  background: var(--paper);
  border-left: 3px solid var(--blue);
  font-size: 14px;
  color: var(--muted);
}
.aibook-lp .article-body img { margin: 24px 0; }
.aibook-lp .article-body hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
.aibook-lp .article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin: 24px 0;
}
.aibook-lp .article-body th,
.aibook-lp .article-body td {
  border-bottom: 1px solid var(--line);
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
}
.aibook-lp .article-body th { background: #f4f6f5; font-weight: 700; }
.aibook-lp .article-body code {
  background: var(--pale);
  padding: 2px 6px;
  font-size: .92em;
}
.aibook-lp .article-body pre {
  background: var(--ink);
  color: #e8eef2;
  padding: 20px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.8;
}
.aibook-lp .article-body pre code { background: none; padding: 0; }

/* 記事のFAQ・CTA・関連記事 */
.aibook-lp .article-faq { margin-top: 56px; }
.aibook-lp .article-faq h2 {
  font: 600 22px/1.7 var(--serif);
  letter-spacing: .03em;
  margin-bottom: 18px;
}
.aibook-lp .article-cta {
  margin-top: 56px;
  background: var(--pale);
  border-top: 3px solid var(--blue);
  padding: 36px 38px;
}
.aibook-lp .article-cta h2 {
  font: 600 22px/1.7 var(--serif);
  letter-spacing: .03em;
  margin: 14px 0 14px;
}
.aibook-lp .article-cta p { font-size: 14px; line-height: 2; color: var(--muted); }
.aibook-lp .article-cta .btn { margin-top: 24px; }
.aibook-lp .article-related { margin-top: 64px; }
.aibook-lp .article-related h2 {
  font: 600 22px/1.7 var(--serif);
  letter-spacing: .03em;
  margin-bottom: 22px;
}
.aibook-lp .article-related .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
/* 関連記事は既定で2列。3本ある記事だけ3列にし、端に1枚だけ余らせない。
   980px以下は .article-grid 側の指定（2列→1列）をそのまま使う。 */
@media (min-width: 981px) {
  .aibook-lp .article-related .related-count-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
}
.aibook-lp .article-back { margin: 56px 0 96px !important; }

/* お問い合わせ（HubSpot埋め込みフォーム）
   旧サイトの /contact.php と同じフォームを埋め込み、見た目だけLPに合わせる。
   HubSpotが出力するクラス（.hs-form / .hs-input / .hs-button など）に当てている。 */
.aibook-lp .contact-section { padding-top: 48px; }
.aibook-lp .contact-container { max-width: 760px; }
.aibook-lp .form-notice {
  padding: 18px 22px;
  font-size: 14px;
  line-height: 1.95;
  margin-bottom: 28px;
  background: var(--pale);
  border-left: 3px solid var(--blue);
}
.aibook-lp .form-notice a { border-bottom: 1px solid currentColor; }
.aibook-lp .form-note {
  font-size: 12px;
  line-height: 1.95;
  color: var(--muted);
  margin-top: 28px !important;
}
.aibook-lp .form-note a { border-bottom: 1px solid var(--line); }
.aibook-lp .form-note a:hover { color: var(--blue); }

.aibook-lp .hs-form-wrap { min-height: 320px; }
.aibook-lp .hs-form fieldset { max-width: none; border: 0; padding: 0; margin: 0; }
.aibook-lp .hs-form .hs-form-field { margin-bottom: 24px; }
.aibook-lp .hs-form label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.7;
  margin-bottom: 9px;
}
.aibook-lp .hs-form .hs-form-required { color: #a52727; margin-left: 4px; }
.aibook-lp .hs-form .hs-field-desc {
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
  margin: 0 0 9px;
}
.aibook-lp .hs-form input[type="text"],
.aibook-lp .hs-form input[type="email"],
.aibook-lp .hs-form input[type="tel"],
.aibook-lp .hs-form input[type="number"],
.aibook-lp .hs-form select,
.aibook-lp .hs-form textarea {
  width: 100%;
  font: inherit;
  font-size: 15px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 13px 15px;
  min-height: 52px;
  transition: border-color .2s;
  -webkit-appearance: none;
  appearance: none;
  box-sizing: border-box;
}
.aibook-lp .hs-form select {
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%),
    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 20px) 23px, calc(100% - 14px) 23px;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 42px;
}
.aibook-lp .hs-form textarea { min-height: 180px; line-height: 1.9; resize: vertical; }
.aibook-lp .hs-form :focus-visible { border-color: var(--blue); }
.aibook-lp .hs-form .hs-input.invalid { border-color: #b03030; background: #fdf7f7; }

/* チェックボックス・ラジオ */
.aibook-lp .hs-form .inputs-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.aibook-lp .hs-form .inputs-list label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-weight: 400;
  font-size: 14px;
  line-height: 1.8;
  margin: 0;
  cursor: pointer;
}
.aibook-lp .hs-form .inputs-list input[type="checkbox"],
.aibook-lp .hs-form .inputs-list input[type="radio"] {
  width: 19px;
  height: 19px;
  margin: 2px 0 0;
  flex: none;
  accent-color: var(--blue);
}
.aibook-lp .hs-form .inputs-list span { display: inline; }

/* エラー表示 */
.aibook-lp .hs-form .hs-error-msgs {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}
.aibook-lp .hs-form .hs-error-msgs label {
  font-size: 12px;
  font-weight: 700;
  color: #a52727;
  margin: 0;
}

/* 送信ボタン。LPの .btn-primary に合わせる */
.aibook-lp .hs-form .hs-submit { margin-top: 32px; }
.aibook-lp .hs-form .actions { padding: 0; margin: 0; }
.aibook-lp .hs-form input[type="submit"],
.aibook-lp .hs-form .hs-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  min-width: 280px;
  padding: 14px 27px;
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.6;
  color: #fff;
  background: var(--blue);
  border: 0;
  border-radius: 0;
  cursor: pointer;
  transition: background .2s, transform .2s;
  -webkit-appearance: none;
  appearance: none;
}
.aibook-lp .hs-form input[type="submit"]:hover,
.aibook-lp .hs-form .hs-button:hover {
  background: var(--blue-dark);
  transform: translateY(-2px);
}
.aibook-lp .hs-form input[type="submit"]:disabled { opacity: .6; cursor: progress; transform: none; }

/* 送信後の完了メッセージ */
.aibook-lp .submitted-message {
  background: var(--pale);
  border-top: 3px solid var(--blue);
  padding: 36px 38px;
  font-size: 14px;
  line-height: 2;
}
.aibook-lp .submitted-message h2 {
  font: 600 22px/1.7 var(--serif) !important;
  letter-spacing: .03em;
  margin-bottom: 16px !important;
  text-align: left !important;
  background: none !important;
  color: var(--ink) !important;
}
.aibook-lp .submitted-message p { margin: 14px 0; background: none !important; color: var(--muted) !important; }

@media (max-width: 980px) {
  .aibook-lp .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
  .aibook-lp .article-cta { padding: 30px 26px; }
  .aibook-lp .page-head { padding-top: 44px; }
}

@media (max-width: 640px) {
  /* style.css がスマホ用に確保する固定CTA分の余白は、固定CTAが無いページでは戻す。 */
  .aibook-lp.no-sticky-cta { padding-bottom: 0; }
  .aibook-lp .breadcrumb ol { padding: 13px 0; font-size: 10px; }
  .aibook-lp .page-head { padding: 34px 0 4px; }
  .aibook-lp .page-head .lead { font-size: 13px; }
  .aibook-lp .page-head + .section { padding-top: 40px; }
  .aibook-lp .article-grid,
  .aibook-lp .article-related .article-grid { grid-template-columns: 1fr; gap: 18px; }
  .aibook-lp .article-card-link { padding: 22px 20px; }
  .aibook-lp .article { padding-top: 32px; }
  .aibook-lp .article-body { font-size: 14px; line-height: 2.05; }
  .aibook-lp .article-body h2 { font-size: 20px; margin: 42px 0 16px; scroll-margin-top: 88px; }
  .aibook-lp .article-body h3 { font-size: 16px; scroll-margin-top: 88px; }
  .aibook-lp .toc { padding: 20px; }
  .aibook-lp .article-cta { padding: 26px 22px; }
  .aibook-lp .article-cta .btn { width: 100%; }
  .aibook-lp .article-back { margin-bottom: 64px !important; }
  .aibook-lp .empty-state { padding: 30px 20px; font-size: 13px; }
  .aibook-lp .hs-form input[type="submit"],
  .aibook-lp .hs-form .hs-button { width: 100%; min-width: 0; }
  .aibook-lp .hs-form input,
  .aibook-lp .hs-form select,
  .aibook-lp .hs-form textarea { font-size: 16px; } /* iOS の自動ズーム対策 */
  .aibook-lp .submitted-message { padding: 26px 22px; }
}

/* カテゴリ導線とページ送り
   記事が215本あり一覧が1ページに収まらないため、カテゴリで束ねてページを分ける。
   既存の .article-grid の上に置く。 */
.aibook-lp .category-nav { margin: 0 0 26px; }
.aibook-lp .category-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.aibook-lp .category-nav a,
.aibook-lp .category-nav span[aria-current] {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 15px;
  border: 1px solid #d8dde4;
  border-radius: 999px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: #24313f;
  text-decoration: none;
  background: #fff;
  transition: border-color .2s, background-color .2s;
}
.aibook-lp .category-nav a:hover { border-color: #24313f; background: #f6f8fa; }
.aibook-lp .category-nav span[aria-current] {
  background: #24313f;
  border-color: #24313f;
  color: #fff;
  font-weight: 600;
}
.aibook-lp .category-nav-count { font-size: 11px; opacity: .65; }
.aibook-lp .column-count {
  margin: 0 0 18px;
  font-size: 13px;
  color: #6b7785;
  letter-spacing: .03em;
}
.aibook-lp .column-count span { font-size: 12px; }

.aibook-lp .pager {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 48px 0 0;
}
.aibook-lp .pager ul {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.aibook-lp .pager-num,
.aibook-lp .pager-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border: 1px solid #d8dde4;
  border-radius: 4px;
  font-size: 13px;
  color: #24313f;
  text-decoration: none;
  background: #fff;
}
.aibook-lp .pager-num:hover,
.aibook-lp .pager-step:hover { border-color: #24313f; background: #f6f8fa; }
.aibook-lp .pager-num[aria-current] {
  background: #24313f;
  border-color: #24313f;
  color: #fff;
  font-weight: 600;
}
.aibook-lp .pager-step.is-disabled { opacity: .35; pointer-events: none; }
.aibook-lp .pager-gap {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 4px;
  color: #98a2ad;
}
.aibook-lp .article-category a { color: inherit; text-decoration: none; border-bottom: 1px solid currentColor; }
.aibook-lp .article-category a:hover { opacity: .7; }

@media (max-width: 640px) {
  .aibook-lp .category-nav ul { gap: 6px; }
  .aibook-lp .category-nav a,
  .aibook-lp .category-nav span[aria-current] { padding: 7px 12px; font-size: 12px; }
  .aibook-lp .pager { gap: 6px; }
  .aibook-lp .pager-num,
  .aibook-lp .pager-step { min-width: 36px; height: 36px; padding: 0 9px; font-size: 12px; }
  .aibook-lp .pager-step { flex-basis: 100%; order: 3; }
  .aibook-lp .pager-step[rel="prev"] { order: 1; }
}