/*
Theme Name: Knowledge Hub
Theme URI: https://example.com/knowledge-hub
Author: Your Company
Author URI: https://example.com
Description: データポータル(Looker Studio)特化のナレッジベース・お役立ち記事サイト向けテーマ。関数辞典・使い方ガイド・テンプレートをカード型グリッドで一覧表示し、目次/人気記事/著者ボックス/FAQ構造化データでSEOを強化します。
Version: 1.0.0
Requires at least: 6.0
Requires PHP: 7.4
License: GPL v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: knowledge-hub
*/

/* =========================================================
   0. Design tokens
   ========================================================= */
:root {
  --header-height: 80px;
  --fg-color: #222222;
  --muted-color: #666666;
  --border-color: #dddddd;
  --bg-color: #ffffff;
  --bg-soft: #f7f7f8;

  --color-accent: #ED6541;      /* orange */
  --color-accent-dark: #d4522f;
  --color-navy: #0B368C;        /* deep blue */

  --tag-blue: #0B368C;
  --tag-orange: #ED6541;
  --tag-green: #4caf50;
  --tag-red: #8C0B0B;
  --tag-pink: #f394dc;
  --tag-brown: #875f4c;
  --tag-yellow: #e9b700;

  --radius-card: 2px;
  --content-width: 700px;
  --page-width: 1120px;

  --font-base: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  --font-heading: "Josefin Sans", var(--font-base);
}

/* =========================================================
   1. Reset / base
   ========================================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--fg-color);
  background: var(--bg-color);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

.screen-reader-text {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  white-space: nowrap;
}

.container {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 24px;
}

.content-narrow {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1rem;
}

/* =========================================================
   2. Header
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
}

.site-header__inner {
  width: 100%;
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-branding {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--fg-color);
  white-space: nowrap;
}

.site-branding img {
  max-height: 40px;
  width: auto;
}

.primary-nav {
  display: flex;
}

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.primary-nav a {
  display: inline-block;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 999px;
  transition: 0.2s;
}

.primary-nav a:hover,
.primary-nav .current-menu-item > a {
  background: var(--bg-soft);
  color: var(--color-accent);
}

.menu-toggle {
  display: none;
  border: none;
  background: transparent;
  width: 40px;
  height: 40px;
  position: relative;
}

.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  height: 2px;
  background: var(--fg-color);
  transition: 0.2s;
}

.menu-toggle span {
  top: 19px;
}

.menu-toggle span::before {
  top: -7px;
}

.menu-toggle span::after {
  top: 7px;
}

.menu-toggle[aria-expanded="true"] span {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] span::before {
  transform: rotate(45deg);
  top: 0;
}

.menu-toggle[aria-expanded="true"] span::after {
  transform: rotate(-45deg);
  top: 0;
}

@media (max-width: 880px) {
  .menu-toggle {
    display: block;
  }

  .primary-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.06);
  }

  .primary-nav.is-open {
    display: block;
  }

  .primary-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 16px;
  }

  .primary-nav a {
    padding: 12px 8px;
    border-radius: 0;
    border-bottom: 1px solid var(--bg-soft);
  }

  body.nav-open {
    overflow: hidden;
  }
}

/* =========================================================
   3. Page header / breadcrumb
   ========================================================= */
.page-header-band {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--border-color);
  padding: 48px 0 32px;
}

.page-header-band__title {
  font-size: 32px;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-header-band__desc {
  color: var(--muted-color);
  font-size: 15px;
  max-width: 640px;
}

.breadcrumbs {
  font-size: 13px;
  color: var(--muted-color);
  margin-bottom: 12px;
}

.breadcrumbs a {
  color: var(--color-navy);
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

.breadcrumbs .sep {
  margin: 0 6px;
  color: #bbb;
}

/* =========================================================
   4. Category filter chips
   ========================================================= */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 8px;
}

.category-filter a {
  display: inline-block;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  transition: 0.2s;
}

.category-filter a:hover,
.category-filter a.is-active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

/* =========================================================
   5. Knowledge card grid
   ========================================================= */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  padding: 40px 0 24px;
}

@media (max-width: 960px) {
  .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px 10px;
  }

  .knowledge-card__body {
    padding: 8px 0 0;
  }

  .knowledge-card__badge {
    font-size: 10px;
    padding: 2px 8px;
    top: 6px;
    left: 6px;
  }

  .knowledge-card__meta {
    font-size: 11px;
    margin-bottom: 4px;
  }

  .knowledge-card__title {
    font-size: 13px;
    line-height: 1.4;
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  /* Reference layout keeps the mobile card to thumbnail + title only. */
  .knowledge-card__excerpt,
  .knowledge-card__tags {
    display: none;
  }
}

.knowledge-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-card);
  transition: all 0.2s ease;
}

.knowledge-card:hover {
  transform: translateY(-4px);
}

.knowledge-card__cover {
  position: relative;
  display: block;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--bg-soft);
}

.knowledge-card__badge {
  position: absolute;
  top: 10px;
  left: 10px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
}

.knowledge-card__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.knowledge-card:hover .knowledge-card__cover img {
  transform: scale(1.04);
  transition: 0.4s ease;
}

.knowledge-card__body {
  padding: 14px 2px 0;
}

.knowledge-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.tag-pill {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  color: #fff;
  background: var(--tag-blue);
}

.tag-pill[data-color="orange"] { background: var(--tag-orange); }
.tag-pill[data-color="green"]  { background: var(--tag-green); }
.tag-pill[data-color="red"]    { background: var(--tag-red); }
.tag-pill[data-color="pink"]   { background: var(--tag-pink); color: #4a1f3a; }
.tag-pill[data-color="brown"]  { background: var(--tag-brown); }
.tag-pill[data-color="yellow"] { background: var(--tag-yellow); color: #3a2c00; }
.tag-pill[data-color="blue"]   { background: var(--tag-blue); }

.knowledge-card__title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  margin: 0 0 8px;
}

.knowledge-card:hover .knowledge-card__title {
  color: var(--color-accent);
}

.knowledge-card__meta {
  font-size: 12px;
  color: var(--muted-color);
  margin-bottom: 6px;
}

.knowledge-card__excerpt {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted-color);
  margin: 0 0 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* =========================================================
   6. Buttons / links
   ========================================================= */
.btn {
  display: inline-block;
  padding: 16px 40px;
  border: none;
  border-radius: var(--radius-card);
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  opacity: 1;
  transition: 0.25s;
}

.btn:hover {
  opacity: 0.7;
}

.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 24px 0 64px;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  font-size: 14px;
}

.pagination .current {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.pagination a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* =========================================================
   7. Single article
   ========================================================= */
.single-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--content-width)) 320px;
  gap: 48px;
  align-items: start;
  padding: 48px 24px 0;
}

@media (max-width: 960px) {
  .single-layout {
    grid-template-columns: 1fr;
    padding: 32px 16px 0;
  }
}

.article {
  min-width: 0;
  padding: 0 0 80px;
}

.article__header {
  margin-bottom: 32px;
}

.article__title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.5;
  margin: 12px 0;
}

.article__meta {
  font-size: 13px;
  color: var(--muted-color);
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.article__cover {
  margin: 24px 0;
  border: 1px solid var(--border-color);
}

.article__body {
  font-size: 16px;
}

.article__body h2 {
  font-size: 22px;
  margin-top: 2.4em;
  padding-bottom: 0.4em;
  border-bottom: 2px solid var(--color-accent);
}

.article__body h3 {
  font-size: 18px;
  margin-top: 2em;
}

.article__body a {
  color: var(--color-navy);
  text-decoration: underline;
}

.article__body img {
  margin: 1.5em auto;
}

.article__body blockquote {
  margin: 1.5em 0;
  padding: 12px 20px;
  border-left: 4px solid var(--color-accent);
  background: var(--bg-soft);
  color: var(--muted-color);
}

.article__body pre {
  background: #1e1e1e;
  color: #eee;
  padding: 16px;
  overflow-x: auto;
  border-radius: var(--radius-card);
}

.article__body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
}

.article__body th,
.article__body td {
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  text-align: left;
}

.article__cta {
  margin: 56px 0;
  text-align: center;
}

.article__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 32px;
}

.article__body pre {
  position: relative;
}

.code-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 700;
  color: #eee;
  background: #3a3a3a;
  border: 1px solid #555;
  border-radius: var(--radius-card);
  transition: 0.2s;
}

.code-copy-btn:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.code-copy-btn.is-copied {
  background: var(--tag-green);
  border-color: var(--tag-green);
  color: #fff;
}

/* --- FAQ (schema-backed accordion) --- */
.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  margin: 16px 0;
  overflow: hidden;
}

.faq-item__q {
  margin: 0;
  padding: 14px 44px 14px 18px;
  font-weight: 700;
  background: var(--bg-soft);
  cursor: pointer;
  position: relative;
}

.faq-item__q::before {
  content: "Q";
  color: var(--color-accent);
  margin-right: 8px;
}

.faq-item__q::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--muted-color);
  transition: 0.2s;
}

.faq-item.is-open .faq-item__q::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-item__a {
  padding: 16px 18px;
  display: none;
}

.faq-item.is-open .faq-item__a {
  display: block;
}

/* --- Author box --- */
.author-box {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-top: 48px;
  padding: 20px;
  background: var(--bg-soft);
  border-radius: var(--radius-card);
}

.author-box img {
  border-radius: 50%;
  flex-shrink: 0;
}

.author-box__name {
  font-weight: 700;
  margin: 0 0 6px;
}

.author-box__bio {
  font-size: 13px;
  color: var(--muted-color);
  margin: 0;
}

/* =========================================================
   7b. Article sidebar (TOC / popular / CTA)
   ========================================================= */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.article-sidebar__block {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 20px;
}

.toc-box--sticky {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  max-height: calc(100vh - var(--header-height) - 48px);
  overflow-y: auto;
}

.toc-box__title,
.popular-box__title {
  font-size: 13px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--muted-color);
  letter-spacing: 0.05em;
}

.toc-box__list {
  counter-reset: toc;
}

.toc-box__item {
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 8px;
}

.toc-box__item a {
  color: var(--fg-color);
}

.toc-box__item a:hover {
  color: var(--color-accent);
}

.toc-box__item.is-level-3 {
  padding-left: 16px;
  font-size: 12px;
  color: var(--muted-color);
}

.popular-box__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.popular-box__item {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 13px;
  line-height: 1.5;
}

.popular-box__rank {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-navy);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  border-radius: 50%;
}

.popular-box__item a:hover {
  color: var(--color-accent);
}

.cta-box {
  background: var(--bg-soft);
}

.cta-box__title {
  font-weight: 700;
  margin: 0 0 8px;
}

.cta-box__text {
  font-size: 13px;
  color: var(--muted-color);
  margin: 0 0 16px;
}

.cta-box__btn {
  display: block;
  text-align: center;
  padding: 12px 20px;
}

@media (max-width: 960px) {
  .toc-box--sticky {
    position: static;
    max-height: none;
  }
}

/* =========================================================
   8. Footer
   ========================================================= */
.site-footer {
  background: #1c1f26;
  color: #cfd2d8;
  padding: 48px 0 24px;
  margin-top: 40px;
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
}

.footer-nav a {
  font-size: 14px;
  color: #cfd2d8;
  transition: 0.2s;
}

.footer-nav a:hover {
  color: var(--color-accent);
}

.social-icons {
  display: flex;
  gap: 16px;
}

.social-icons a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #444750;
  border-radius: 50%;
  transition: 0.2s;
}

.social-icons a:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.social-icons svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.site-footer__copyright {
  font-size: 12px;
  color: #888b93;
}

/* =========================================================
   9. Misc / widgets / search
   ========================================================= */
.search-form {
  display: flex;
  gap: 8px;
  margin: 24px 0;
}

.search-form input[type="search"] {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  font-size: 14px;
}

.empty-state {
  text-align: center;
  padding: 80px 0;
  color: var(--muted-color);
}

/* =========================================================
   10. Ad / affiliate slots
   ========================================================= */
.ad-slot {
  position: relative;
  margin: 32px 0;
  padding: 28px 16px 16px;
  background: var(--bg-soft);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  text-align: center;
  overflow-x: auto;
}

.ad-slot__label {
  position: absolute;
  top: 6px;
  left: 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--muted-color);
}

.ad-slot__body {
  display: inline-block;
  max-width: 100%;
}

.ad-slot__body img {
  display: inline-block;
  max-width: 100%;
  height: auto;
}

.ad-slot--grid-banner {
  grid-column: 1 / -1;
  margin: 0;
}

.knowledge-grid--featured {
  margin-bottom: 8px;
}