/*
Theme Name: Tonari Column
Theme URI: https://tonari-digital.com/column
Author: となりデジタル
Author URI: https://tonari-digital.com
Description: となりデジタルのSEOコラム用WordPressテーマ。B2B/SEO領域向けの信頼感（E-E-A-T）とCV導線を最大化するミニマルデザイン。
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: tonari-column
*/

/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */
:root {
  /* Colors */
  --color-main: #A8E6CF;
  --color-main-dark: #7DD3AF;
  --color-main-light: #D4F3E7;
  --color-sub: #9DC1E9;
  --color-sub-dark: #7AADDE;
  --color-sub-light: #C8DCF2;
  --color-accent: #9DC1E9;
  --color-accent-dark: #7AADDE;
  --color-text: #333333;
  --color-text-light: #5F6368;
  --color-border: #E0E0E0;
  --color-bg: #FFFFFF;
  --color-bg-light: #F8F9FA;

  /* Typography */
  --font-family: 'Noto Sans JP', sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.8;

  /* Layout */
  --content-max-width: 780px;
  --site-max-width: 1100px;
  --header-height: 72px;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 48px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: var(--line-height-base);
}

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

a {
  color: var(--color-sub-dark);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-dark);
}

/* ==========================================================================
   Layout Utilities
   ========================================================================== */
.site-container {
  max-width: var(--site-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

.article-container {
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family);
  color: var(--color-text);
}

h1 {
  font-size: clamp(1.375rem, 5vw, 2rem);
  line-height: 1.6;
  font-weight: 700;
}

h2 {
  font-size: 1.5rem;
  line-height: 1.5;
  font-weight: 700;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.25rem;
  line-height: 1.5;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 1rem;
}

p {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

/* ==========================================================================
   Component Styles
   ========================================================================== */

/* Category Label */
.category-label {
  display: inline-block;
  background-color: var(--color-main-light);
  color: var(--color-text);
  padding: var(--spacing-xs) 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* Heading with accent border */
.heading-with-accent {
  position: relative;
  padding-left: 1rem;
  border-left: 4px solid var(--color-accent);
}

/* H3 underline */
.heading-underline {
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 0.25rem;
  text-decoration-thickness: 2px;
}

/* Summary Block */
.summary-block {
  background-color: var(--color-bg-light);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-accent);
  margin-bottom: 2rem;
}

.summary-block ul {
  list-style: none;
  padding-left: 0;
}

.summary-block li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.summary-block li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

/* Table of Contents */
.toc {
  background-color: var(--color-bg-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: 2rem;
}

.toc-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.toc-list {
  list-style: none;
  padding-left: 0;
}

.toc-list li {
  margin-bottom: var(--spacing-sm);
}

.toc-list a {
  color: var(--color-text);
  font-size: 0.9375rem;
  transition: color 0.2s ease;
}

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

.toc-list .toc-h3 {
  padding-left: 1.5rem;
}

/* Author Box */
.author-box {
  display: flex;
  gap: var(--spacing-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin: 3rem 0;
}

.author-avatar {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
}

.author-name {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.author-role {
  font-size: 0.8125rem;
  color: var(--color-sub-dark);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.author-bio {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

/* Related Articles */
.related-articles {
  margin: 3rem 0;
}

.related-articles-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.related-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.related-card:hover {
  transform: scale(1.03);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.related-card-image {
  aspect-ratio: 16 / 9;
  object-fit: cover;
  width: 100%;
}

.related-card-body {
  padding: var(--spacing-md);
}

.related-card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-top: 0.5rem;
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, var(--color-main-light), var(--color-sub-light));
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl) var(--spacing-lg);
  text-align: center;
  margin: 3rem 0;
}

.cta-section h2 {
  margin-top: 0;
  margin-bottom: 1rem;
}

.cta-section p {
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  min-height: 44px;
  min-width: 44px;
  cursor: pointer;
  border: none;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-ghost {
  background: transparent;
  color: var(--color-sub-dark);
  border: 2px solid var(--color-sub-dark);
}

.btn-ghost:hover {
  background-color: var(--color-sub-light);
  color: var(--color-sub-dark);
}

.btn-solid {
  background-color: var(--color-main);
  color: var(--color-text);
}

.btn-solid:hover {
  background-color: var(--color-main-dark);
  color: var(--color-text);
}

.btn-accent {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

.btn-accent:hover {
  background-color: var(--color-accent-dark);
  color: #FFFFFF;
}

/* ==========================================================================
   Article Content Styles (for the_content())
   ========================================================================== */
.article-content h2 {
  position: relative;
  padding-left: 1rem;
  border-left: 4px solid var(--color-accent);
}

.article-content h3 {
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 0.25rem;
  text-decoration-thickness: 2px;
}

.article-content p {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.article-content blockquote {
  border-left: 4px solid var(--color-main);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background-color: var(--color-bg-light);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.article-content blockquote p {
  margin-bottom: 0;
  color: var(--color-text-light);
}

.article-content img {
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
}

.article-content th,
.article-content td {
  border: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  text-align: left;
}

.article-content th {
  background-color: var(--color-bg-light);
  font-weight: 600;
}

/* ==========================================================================
   Meta Information
   ========================================================================== */
.article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--color-text-light);
  font-size: 0.8125rem;
  margin: 1rem 0 1.5rem;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.article-meta-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
}

.article-meta-author {
  font-weight: 500;
}

/* ==========================================================================
   Hero Image
   ========================================================================== */
.hero-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 2rem;
}

/* ==========================================================================
   Breadcrumb
   ========================================================================== */
.breadcrumb {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: var(--color-text-light);
}

.breadcrumb a:hover {
  color: var(--color-accent-dark);
}

.breadcrumb-separator {
  margin: 0 0.5rem;
}

/* ==========================================================================
   Floating Action Buttons
   ========================================================================== */
.fab-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  z-index: 50;
}

.fab-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-sub);
  color: #FFFFFF;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
}

.fab-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  background-color: var(--color-sub-dark);
}

.fab-btn svg {
  width: 20px;
  height: 20px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  padding: 3rem 0;
  margin-top: 4rem;
}

.footer-inner {
  max-width: var(--site-max-width);
  margin: 0 auto;
  padding: 0 1rem;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

.footer-copyright {
  font-size: 0.75rem;
  color: var(--color-text-light);
}

/* ==========================================================================
   Column Top Page
   ========================================================================== */
.column-hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
}

.column-hero h1 {
  margin-bottom: 1rem;
}

.column-hero p {
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: 3rem;
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin: 3rem 0;
}

.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
}

.pagination a {
  color: var(--color-text);
  border: 1px solid var(--color-border);
  transition: all 0.2s ease;
}

.pagination a:hover {
  background-color: var(--color-main-light);
  border-color: var(--color-main);
}

.pagination .current {
  background-color: var(--color-sub);
  color: #FFFFFF;
  border: 1px solid var(--color-sub);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .related-grid,
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 60px;
  }

  .related-grid,
  .articles-grid {
    grid-template-columns: 1fr;
  }

  .author-box {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .article-meta {
    font-size: 0.75rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: 1rem;
    align-items: center;
  }

  .fab-container {
    bottom: 1rem;
    right: 1rem;
  }

  .cta-section {
    padding: 2rem 1rem;
  }

  .header-actions .btn-ghost {
    display: none;
  }
}