/*
Theme Name: AI Agent Labo
Theme URI: https://ai-agent-labo.com
Author: N1 Inc. (株式会社エヌイチ)
Author URI: https://n1-inc.com
Description: AIエージェント専門オウンドメディア「AIエージェントラボ」のカスタムWordPressテーマ。3層デザインシステム（design-system.md）に完全準拠。
Version: 2.0.0
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: ai-agent-labo
Tags: blog, news, custom-menu, custom-logo, featured-images, threaded-comments, translation-ready
*/

/* ==========================================================================
   0. CSS Custom Properties (Design Tokens) — design-system.md 準拠
   ========================================================================== */

:root {
  /* --- Primary Colors (6色パレット) --- */
  --color-primary: #1a237e;
  --color-primary-light: #283593;
  --color-primary-dark: #0d1452;
  --color-accent: #2563EB;
  --color-accent-light: #3b82f6;
  --color-accent-dark: #1d4ed8;
  --color-cta: #059669;
  --color-cta-hover: #047857;
  --color-cta-light: #10b981;

  /* --- Background --- */
  --color-bg: #ffffff;
  --color-bg-secondary: #F9FAFB;
  --color-bg-tertiary: #F1F5F9;

  /* --- Text --- */
  --color-text: #1F2937;
  --color-text-light: #475569;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #ffffff;

  /* --- Border --- */
  --color-border: #E5E7EB;
  --color-border-light: #F1F5F9;

  /* --- Grays --- */
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;

  /* --- Semantic --- */
  --color-success: #059669;
  --color-warning: #d97706;
  --color-error: #dc2626;
  --color-info: #2563EB;

  /* --- Category Colors --- */
  --color-cat-ai-agent: #2563EB;
  --color-cat-ai-automation: #7c3aed;
  --color-cat-ai-adoption: #0d9488;
  --color-cat-case-study: #ea580c;
  --color-cat-tool-compare: #059669;
  --color-cat-news: #dc2626;

  /* --- Typography --- */
  --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  /* --- Spacing (4px base) --- */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* --- Layout --- */
  --width-content: 1200px;
  --width-article: 700px;
  --width-sidebar: 300px;
  --gap-layout: 40px;

  /* --- Border Radius --- */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-2xl: 16px;
  --radius-full: 50px;

  /* --- Transitions --- */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* --- Shadows --- */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);

  /* --- Z-Index --- */
  --z-dropdown: 100;
  --z-sticky: 500;
  --z-fixed-cta: 997;
  --z-overlay: 998;
  --z-mobile-nav: 999;
  --z-header: 1000;
  --z-modal: 1001;
}

/* SP Typography Overrides */
@media (max-width: 639px) {
  :root {
    --text-sm: 0.8125rem;
    --text-base: 0.9375rem;
    --text-lg: 1rem;
    --text-xl: 1.125rem;
    --text-2xl: 1.25rem;
    --text-3xl: 1.5rem;
    --text-4xl: 1.75rem;
    --text-5xl: 2rem;
  }
}

/* ==========================================================================
   1. Reset & Base
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ==========================================================================
   2. Utility Classes
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--width-content);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (max-width: 639px) {
  .container {
    padding: 0 var(--space-4);
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ==========================================================================
   3. Buttons — design-system.md #5 準拠
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 28px;
  font-weight: 600;
  font-size: var(--text-base);
  line-height: 1.4;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-base);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn--cta {
  background: var(--color-cta);
  color: var(--color-text-inverse);
  font-weight: 700;
  padding: 14px 32px;
  box-shadow: 0 2px 8px rgba(5, 150, 105, 0.3);
}

.btn--cta:hover {
  background: var(--color-cta-hover);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(5, 150, 105, 0.4);
}

.btn--secondary {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

.btn--secondary:hover {
  background: var(--color-accent-dark);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
}

.btn--outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--outline:hover {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

.btn--accent {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

.btn--accent:hover {
  background: var(--color-accent-dark);
  color: var(--color-text-inverse);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--primary:hover {
  background: var(--color-primary-light);
  color: var(--color-text-inverse);
}

.btn--sm {
  padding: 8px 16px;
  font-size: var(--text-sm);
}

.btn--lg {
  padding: 16px 40px;
  font-size: var(--text-lg);
}

.btn--block {
  width: 100%;
}

.btn svg {
  flex-shrink: 0;
}

/* ==========================================================================
   4. Header — media-structure.md S1 準拠
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
  height: 64px;
}

.site-header.is-scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.header-inner {
  max-width: var(--width-content);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

/* Logo */
.site-logo a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo .custom-logo-link {
  display: flex;
  align-items: center;
}

.site-logo .custom-logo {
  max-height: 40px;
  width: auto;
  height: auto;
}

/* Mobile logo sizing */
@media (max-width: 1023px) {
  .site-logo .custom-logo {
    max-height: 36px;
  }
}

.site-logo__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  font-weight: 700;
  border-radius: var(--radius-lg);
  letter-spacing: -0.5px;
}

.site-logo__text {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
}

.site-logo__text span {
  color: var(--color-accent);
}

/* Primary Navigation */
.primary-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.primary-nav__item a,
.primary-nav__list > li > a {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-light);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

.primary-nav__item a:hover,
.primary-nav__list > li > a:hover {
  color: var(--color-accent);
  background: var(--color-bg-tertiary);
}

.primary-nav__item a::after,
.primary-nav__list > li > a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: calc(100% - var(--space-6));
  height: 2px;
  background: var(--color-accent);
  transition: transform var(--transition-base);
  border-radius: 1px;
}

.primary-nav__item a:hover::after,
.primary-nav__list > li > a:hover::after,
.primary-nav__item.current-menu-item a::after,
.primary-nav__list > li.current-menu-item > a::after {
  transform: translateX(-50%) scaleX(1);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.header-search-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  color: var(--color-text-light);
  transition: all var(--transition-fast);
}

.header-search-toggle:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-accent);
}

.header-cta .btn {
  padding: 8px 20px;
  font-size: var(--text-sm);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background: var(--color-bg-tertiary);
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: all var(--transition-base);
}

.mobile-menu-toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Header Responsive */
@media (max-width: 1023px) {
  .site-header {
    height: 56px;
  }

  .header-inner {
    padding: 0 var(--space-4);
    gap: var(--space-3);
  }

  .primary-nav,
  .header-cta {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
    width: 44px;
    height: 44px;
  }

  .header-search-toggle {
    width: 44px;
    height: 44px;
  }

  .site-logo__text {
    font-size: var(--text-base);
  }

  .site-logo__icon {
    width: 32px;
    height: 32px;
    font-size: var(--text-xs);
  }
}

@media (max-width: 639px) {
  .header-search-toggle {
    /* Keep search visible on mobile but ensure tap target */
    width: 44px;
    height: 44px;
  }
}

/* Header Spacer */
.header-spacer {
  height: 0;
}

/* ==========================================================================
   5. Mobile Navigation
   ========================================================================== */

.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 320px;
  max-width: 85vw;
  background: var(--color-bg);
  z-index: var(--z-mobile-nav);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  overflow-y: auto;
  padding: var(--space-20) var(--space-6) var(--space-6);
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
}

.mobile-nav.is-open {
  transform: translateX(0);
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-nav__item a,
.mobile-nav__list > li > a {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  min-height: 48px;
  display: flex;
  align-items: center;
}

.mobile-nav__item a:hover,
.mobile-nav__list > li > a:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-accent);
}

.mobile-nav__cta {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.mobile-nav__cta .btn {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Mobile Nav Overlay */
.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-mobile-nav) - 1);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-nav-overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================================
   6. Search Overlay
   ========================================================================== */

.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.95);
  z-index: var(--z-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.search-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.search-overlay__close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.search-overlay__close:hover {
  background: rgba(255, 255, 255, 0.1);
}

.search-overlay__inner {
  width: 100%;
  max-width: 640px;
  padding: 0 var(--space-6);
}

.search-overlay__form {
  display: flex;
  gap: var(--space-3);
}

.search-overlay__input {
  flex: 1;
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-xl);
  color: var(--color-text-inverse);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  outline: none;
  transition: all var(--transition-fast);
}

.search-overlay__input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.search-overlay__input:focus {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.4);
}

.search-overlay__submit {
  padding: var(--space-4) var(--space-8);
  background: var(--color-cta);
  color: var(--color-text-inverse);
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.search-overlay__submit:hover {
  background: var(--color-cta-hover);
}

/* ==========================================================================
   7. Content Layout
   ========================================================================== */

.content-area {
  padding: var(--space-10) 0 var(--space-20);
}

.content-layout {
  display: grid;
  grid-template-columns: 1fr var(--width-sidebar);
  gap: var(--gap-layout);
  align-items: start;
}

@media (max-width: 1023px) {
  .content-layout {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
}

/* ==========================================================================
   8. Section Headers
   ========================================================================== */

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.section-title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.section-title__icon {
  display: inline-block;
  width: 4px;
  height: 24px;
  background: var(--color-accent);
  border-radius: 2px;
  flex-shrink: 0;
}

.section-more {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  transition: gap var(--transition-fast);
  flex-shrink: 0;
}

.section-more:hover {
  gap: var(--space-2);
}

/* ==========================================================================
   9. Article Cards — design-system.md #6 準拠
   ========================================================================== */

.article-grid {
  display: grid;
  gap: var(--space-6);
}

.article-grid--3col {
  grid-template-columns: repeat(3, 1fr);
}

.article-grid--2col {
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 1023px) {
  .article-grid--3col {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 639px) {
  .article-grid--3col,
  .article-grid--2col {
    grid-template-columns: 1fr;
  }
}

.article-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.article-card__thumbnail {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.article-card__thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.article-card:hover .article-card__thumbnail img {
  transform: scale(1.05);
}

.article-card__category {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-inverse);
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  z-index: 1;
}

/* Category badge color variants */
.article-card__category--ai-agent { background: var(--color-cat-ai-agent); }
.article-card__category--ai-automation { background: var(--color-cat-ai-automation); }
.article-card__category--ai-adoption { background: var(--color-cat-ai-adoption); }
.article-card__category--case-study { background: var(--color-cat-case-study); }
.article-card__category--tool-compare { background: var(--color-cat-tool-compare); }
.article-card__category--news { background: var(--color-cat-news); }

.article-card__body {
  padding: var(--space-4) var(--space-5);
}

.article-card__title {
  font-size: var(--text-base);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: var(--space-2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card__title a {
  color: var(--color-text);
  text-decoration: none;
}

.article-card__title a:hover {
  color: var(--color-accent);
}

.article-card__excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: var(--space-3);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.article-card__meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.article-card__meta-item svg {
  flex-shrink: 0;
  opacity: 0.6;
}

/* Large Card (Pickup) */
.article-card--large {
  display: grid;
  grid-template-columns: 3fr 2fr;
}

.article-card--large .article-card__thumbnail {
  aspect-ratio: auto;
  min-height: 280px;
}

.article-card--large .article-card__body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-8);
}

.article-card--large .article-card__title {
  font-size: var(--text-2xl);
  -webkit-line-clamp: 3;
  margin-bottom: var(--space-3);
}

.article-card--large .article-card__excerpt {
  -webkit-line-clamp: 3;
  margin-bottom: var(--space-4);
}

@media (max-width: 639px) {
  .article-card--large {
    grid-template-columns: 1fr;
  }

  .article-card--large .article-card__thumbnail {
    min-height: auto;
    aspect-ratio: 16 / 9;
  }

  .article-card--large .article-card__body {
    padding: var(--space-5);
  }

  .article-card--large .article-card__title {
    font-size: var(--text-xl);
  }
}

/* ==========================================================================
   10. Front Page Sections
   ========================================================================== */

.fp-section {
  margin-bottom: var(--space-12);
}

.fp-section:last-child {
  margin-bottom: 0;
}

/* Download / Whitepaper CTA */
.fp-download {
  margin-top: var(--space-12);
}

.fp-download__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: center;
  padding: var(--space-10);
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

.fp-download__label {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-accent);
  background: rgba(37, 99, 235, 0.1);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
}

.fp-download__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  line-height: 1.3;
}

.fp-download__desc {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: 1.7;
}

.fp-download__form {
  display: flex;
  gap: var(--space-3);
}

.fp-download__input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.fp-download__input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.fp-download__input::placeholder {
  color: var(--color-text-muted);
}

.fp-download__note {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

@media (max-width: 767px) {
  .fp-download__inner {
    grid-template-columns: 1fr;
    padding: var(--space-6);
    gap: var(--space-6);
  }

  .fp-download__form {
    flex-direction: column;
  }
}

/* ==========================================================================
   11. Category Tabs — media-structure.md S3 準拠
   ========================================================================== */

.category-tabs {
  position: sticky;
  top: 64px;
  z-index: var(--z-sticky);
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

@media (max-width: 1023px) {
  .category-tabs {
    top: 56px;
  }
}

.category-tabs__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: var(--space-3) 0;
}

.category-tabs__list::-webkit-scrollbar {
  display: none;
}

.category-tabs__item a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-light);
  white-space: nowrap;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.category-tabs__item a:hover {
  color: var(--color-accent);
  background: var(--color-bg-tertiary);
}

.category-tabs__item.is-active a {
  color: var(--color-text-inverse);
  background: var(--color-accent);
  font-weight: 600;
}

/* ==========================================================================
   12. Sidebar — media-structure.md S8 準拠
   ========================================================================== */

.sidebar {
  position: sticky;
  top: 120px;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

@media (max-width: 1023px) {
  .sidebar {
    position: static;
  }
}

.widget {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.widget__title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-accent);
}

/* Operator Widget */
.widget-operator {
  text-align: center;
  background: linear-gradient(135deg, var(--color-bg-secondary), var(--color-bg));
}

.widget-operator__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: var(--color-text-inverse);
  font-size: var(--text-lg);
  font-weight: 700;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-3);
}

.widget-operator__name {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.widget-operator__desc {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

.widget-operator__author {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.widget-operator__social {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
}

.widget-operator__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-bg-tertiary);
  color: var(--color-text-light);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.widget-operator__social a:hover {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

/* Categories Widget */
.widget-categories__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.widget-categories__item a {
  display: flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-light);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.widget-categories__item a::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  margin-right: var(--space-3);
  flex-shrink: 0;
}

.widget-categories__item a:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-accent);
}

/* Whitepaper CTA Widget */
.widget-whitepaper {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: var(--color-text-inverse);
  border-color: transparent;
}

.widget-whitepaper .widget__title {
  color: var(--color-text-inverse);
  border-bottom-color: rgba(255, 255, 255, 0.2);
}

.widget-whitepaper__label {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
}

.widget-whitepaper__title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-2);
  line-height: 1.4;
}

.widget-whitepaper__desc {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.widget-whitepaper__input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--color-text-inverse);
  background: rgba(255, 255, 255, 0.1);
  margin-bottom: var(--space-3);
  transition: all var(--transition-fast);
}

.widget-whitepaper__input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.widget-whitepaper__input:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.15);
}

/* Newsletter Widget */
.widget-newsletter__desc {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.widget-newsletter__input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--color-text);
  background: var(--color-bg);
  margin-bottom: var(--space-3);
  transition: all var(--transition-fast);
}

.widget-newsletter__input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.widget-newsletter__input::placeholder {
  color: var(--color-text-muted);
}

/* CTA Widget */
.widget-cta {
  text-align: center;
  background: var(--color-bg-secondary);
}

.widget-cta__text {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

/* ==========================================================================
   13. CTA Banner — media-structure.md S7 準拠
   ========================================================================== */

.cta-banner {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  padding: var(--space-20) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 70% 30%, rgba(5, 150, 105, 0.1) 0%, transparent 40%);
  pointer-events: none;
}

.cta-banner__inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
}

.cta-banner__label {
  display: inline-block;
  padding: var(--space-1) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.cta-banner__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-inverse);
  line-height: 1.3;
  margin-bottom: var(--space-4);
}

.cta-banner__text {
  font-size: var(--text-base);
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

.cta-banner__actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 639px) {
  .cta-banner {
    padding: var(--space-12) 0;
  }

  .cta-banner__title {
    font-size: var(--text-2xl);
  }

  .cta-banner__actions {
    flex-direction: column;
    align-items: center;
  }

  .cta-banner__actions .btn {
    width: 100%;
    max-width: 280px;
  }
}

/* ==========================================================================
   14. Footer — media-structure.md S9 準拠
   ========================================================================== */

.site-footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
}

.footer-inner {
  max-width: var(--width-content);
  margin: 0 auto;
  padding: var(--space-16) var(--space-6) var(--space-10);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-12);
}

@media (max-width: 767px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
    padding: var(--space-10) var(--space-4) var(--space-6);
    text-align: center;
  }
}

/* Footer About */
.footer-about__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

@media (max-width: 767px) {
  .footer-about__logo {
    justify-content: center;
  }
}

.footer-about__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  font-weight: 700;
  border-radius: var(--radius-lg);
}

.footer-about__name {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-inverse);
}

.footer-about__desc {
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: var(--space-5);
}

.footer-social {
  display: flex;
  gap: var(--space-3);
}

@media (max-width: 767px) {
  .footer-social {
    justify-content: center;
  }
}

.footer-social__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-gray-400);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.footer-social__link:hover {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

/* Footer Columns */
.footer-col__title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-inverse);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
  padding: var(--space-1) 0;
}

.footer-links a:hover {
  color: var(--color-text-inverse);
}

/* Footer Company */
.footer-company__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-company__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
}

@media (max-width: 767px) {
  .footer-company__item {
    justify-content: center;
  }
}

.footer-company__item svg {
  flex-shrink: 0;
  opacity: 0.6;
}

.footer-company__item a {
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.footer-company__item a:hover {
  color: var(--color-text-inverse);
}

/* Footer Bottom */
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-bottom__inner {
  max-width: var(--width-content);
  margin: 0 auto;
  padding: var(--space-5) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--color-gray-500);
}

.footer-bottom__links {
  display: flex;
  gap: var(--space-6);
}

.footer-bottom__links a {
  color: var(--color-gray-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-bottom__links a:hover {
  color: var(--color-gray-300);
}

@media (max-width: 639px) {
  .footer-bottom__inner {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
    padding: var(--space-4);
  }
}

/* ==========================================================================
   15. Breadcrumb
   ========================================================================== */

.breadcrumb {
  padding: var(--space-4) 0;
  margin-bottom: var(--space-6);
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-1);
  font-size: var(--text-sm);
}

.breadcrumb__list li {
  display: flex;
  align-items: center;
}

.breadcrumb__list a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.breadcrumb__separator {
  color: var(--color-text-muted);
  margin: 0 var(--space-1);
}

.breadcrumb__list li:last-child span {
  color: var(--color-text-light);
  font-weight: 500;
}

/* ==========================================================================
   16. Single Post — media-structure.md S10 準拠
   ========================================================================== */

.post-header {
  margin-bottom: var(--space-8);
}

.post-header__category {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-inverse);
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  text-decoration: none;
  margin-bottom: var(--space-4);
  transition: background var(--transition-fast);
}

.post-header__category:hover {
  background: var(--color-accent-dark);
  color: var(--color-text-inverse);
}

.post-header__title {
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.post-meta__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.post-meta__item svg {
  opacity: 0.6;
  flex-shrink: 0;
}

/* Post Thumbnail */
.post-thumbnail {
  margin-bottom: var(--space-8);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.post-thumbnail img {
  width: 100%;
  height: auto;
}

/* Supervisor Box (監修者ボックス — PDF完全再現) */
.supervisor-box {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-8);
}

.supervisor-box__header {
  background: var(--color-primary);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 700;
  padding: 8px var(--space-6);
}

.supervisor-box__body {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
  padding: var(--space-6);
}

.supervisor-box__avatar {
  flex-shrink: 0;
}

.supervisor-box__avatar img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 20%;
}

.supervisor-box__name {
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: 2px;
  line-height: 1.4;
}

.supervisor-box__ruby {
  font-weight: 400;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.supervisor-box__title {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.supervisor-box__bio {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.supervisor-box__x-link {
  display: inline-flex;
  align-items: center;
  color: var(--color-text);
  transition: color 0.2s;
}

.supervisor-box__x-link:hover {
  color: var(--color-accent);
}

/* Article Inline CTA Button (記事内の無料相談リンクをボタン化 — ダークネイビー) */
.post-content a[href*="/contact/"] {
  display: block;
  max-width: 360px;
  margin: 1.5em auto;
  padding: 14px 32px;
  background: var(--color-primary);
  color: #fff !important;
  text-align: center;
  text-decoration: none;
  font-weight: 700;
  font-size: var(--text-base);
  border-radius: var(--radius-md);
  box-shadow: 0 2px 8px rgba(26, 35, 126, 0.25);
  transition: background 0.2s, transform 0.2s;
}

.post-content a[href*="/contact/"]:hover {
  background: var(--color-primary-light);
  color: #fff !important;
  transform: translateY(-2px);
  text-decoration: none;
}

/* Yellow Underline Marker (特に強調したい箇所に使用) */
.post-content mark,
.post-content .marker,
.post-content--lead mark,
.post-content--lead .marker {
  background: transparent;
  background-image: linear-gradient(transparent 60%, #ffe066 60%);
  padding: 0 2px;
  color: inherit;
  font-style: inherit;
  font-weight: inherit;
}

/* Lead section (リード文) — .post-content と同等の基本スタイルを適用 */
.post-content--lead {
  max-width: var(--width-article);
  line-height: 1.8;
  margin-bottom: 0;
}

/* Table of Contents */
.toc {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
}

.toc__title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.toc__title svg {
  opacity: 0.6;
}

.toc__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  counter-reset: toc;
  padding-left: 0;
}

.toc__list li {
  counter-increment: toc;
}

.toc__list li::before {
  content: counter(toc) '. ';
  font-weight: 600;
  color: var(--color-accent);
}

.toc__list a {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.toc__list li li {
  padding-left: var(--space-5);
}

/* Post Content */
.post-content {
  max-width: var(--width-article);
  line-height: 1.8;
}

/* WordPress区切り線を非表示（記事内のセクション間hr） */
.post-content .wp-block-separator,
.post-content--lead .wp-block-separator {
  display: none;
}

.post-content h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  margin: var(--space-12) 0 var(--space-6);
  padding-left: var(--space-4);
  border-left: 4px solid var(--color-accent);
  line-height: 1.3;
}

.post-content h3 {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin: var(--space-10) 0 var(--space-5);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-border);
  line-height: 1.3;
}

.post-content h4 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin: var(--space-8) 0 var(--space-4);
  line-height: 1.3;
}

.post-content p {
  margin-bottom: var(--space-6);
}

.post-content ul,
.post-content ol {
  margin-bottom: var(--space-6);
  padding-left: var(--space-6);
}

.post-content ul {
  list-style: disc;
}

.post-content ol {
  list-style: decimal;
}

.post-content li {
  margin-bottom: var(--space-2);
  line-height: 1.7;
}

.post-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.post-content img {
  border-radius: var(--radius-lg);
  margin: var(--space-6) 0;
}

.post-content blockquote {
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg-secondary);
  padding: var(--space-5) var(--space-6);
  margin: var(--space-6) 0;
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  font-style: italic;
  color: var(--color-text-light);
}

.post-content blockquote p:last-child {
  margin-bottom: 0;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 2px 6px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  color: var(--color-accent-dark);
}

.post-content pre {
  background: var(--color-gray-900);
  color: var(--color-gray-100);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: var(--space-6) 0;
  line-height: 1.6;
}

.post-content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: var(--text-sm);
}

/* テーブル: インラインCSS（カスタマイザー由来）を上書き */
.post-content figure.wp-block-table {
  margin: var(--space-6) 0 !important;
  padding: 0 !important;
  border: none !important;
  overflow: hidden !important;
  border-radius: var(--radius-md) !important;
  display: block !important;
  box-shadow: none !important;
  position: static !important;
}

/* スクロールヒント「← スクロールできます →」を非表示 */
.post-content .wp-block-table::before,
.entry-content .wp-block-table::before {
  display: none !important;
  content: none !important;
}

.post-content table {
  width: 100% !important;
  border-collapse: collapse !important;
  margin: 0 !important;
  font-size: var(--text-sm) !important;
  border: none !important;
  box-shadow: none !important;
  min-width: 0 !important;
}

.post-content th,
.post-content td {
  padding: var(--space-3) var(--space-4) !important;
  border: 1px solid var(--color-border) !important;
  text-align: left !important;
  white-space: normal !important;
  position: static !important;
}

.post-content th {
  background: var(--color-primary) !important;
  color: #fff !important;
  font-weight: 700 !important;
  border-color: var(--color-primary) !important;
}

/* Author Box */
.author-box {
  display: flex;
  gap: var(--space-5);
  padding: var(--space-6);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  margin-top: var(--space-10);
}

.author-box__avatar {
  flex-shrink: 0;
}

.author-box__avatar img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
}

.author-box__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.author-box__name {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.author-box__name a {
  color: var(--color-text);
  text-decoration: none;
}

.author-box__name a:hover {
  color: var(--color-accent);
}

.author-box__bio {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  line-height: 1.7;
}

@media (max-width: 639px) {
  .author-box {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

/* Post CTA */
.post-cta {
  text-align: center;
  padding: var(--space-12);
  background: linear-gradient(135deg, #f0f4ff 0%, #eef2ff 100%);
  border: 2px solid #c7d2fe;
  border-radius: var(--radius-xl);
  margin-top: var(--space-12);
  position: relative;
  overflow: hidden;
}

.post-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.post-cta__title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  line-height: 1.4;
}

.post-cta__text {
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-6);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

/* Related Posts */
.related-posts {
  margin-top: var(--space-16);
}

.related-posts__title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.related-posts__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

@media (max-width: 1023px) {
  .related-posts__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 639px) {
  .related-posts__grid {
    grid-template-columns: 1fr;
  }
}

/* Post Tags */
.post-tags {
  margin-top: var(--space-8);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.post-tags a {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--color-bg-tertiary);
  color: var(--color-text-light);
  font-size: var(--text-xs);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.post-tags a:hover {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

/* Sidebar TOC */
.toc-sidebar {
  margin-bottom: var(--space-6);
}

#sidebar-toc .toc__list {
  font-size: var(--text-sm);
}

/* ==========================================================================
   17. Archive — media-structure.md S11 準拠
   ========================================================================== */

.archive-header {
  text-align: center;
  padding: var(--space-10) 0 var(--space-8);
}

.archive-header__label {
  display: inline-block;
  padding: var(--space-1) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(37, 99, 235, 0.08);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
}

.archive-header__title {
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  margin-bottom: var(--space-3);
}

.archive-header__description {
  font-size: var(--text-base);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Pagination */
.pagination {
  margin-top: var(--space-12);
  display: flex;
  justify-content: center;
}

.pagination .nav-links {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

.pagination .page-numbers {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-light);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.pagination .page-numbers:hover {
  background: var(--color-bg-tertiary);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.pagination .page-numbers.current {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-text-inverse);
}

/* No Results */
.no-results {
  text-align: center;
  padding: var(--space-20) 0;
}

.no-results__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.no-results__text {
  font-size: var(--text-base);
  color: var(--color-text-light);
  margin-bottom: var(--space-6);
}

/* ==========================================================================
   18. Page Template
   ========================================================================== */

.page-header {
  text-align: center;
  padding: var(--space-10) 0;
}

.page-header__title {
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.page-content {
  max-width: var(--width-article);
  margin: 0 auto;
  padding-bottom: var(--space-16);
}

/* ==========================================================================
   19. 404 Page
   ========================================================================== */

.error-404 {
  text-align: center;
  padding: var(--space-24) 0;
}

.error-404__code {
  font-size: 120px;
  font-weight: 700;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: var(--space-4);
}

.error-404__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.error-404__text {
  font-size: var(--text-base);
  color: var(--color-text-light);
  margin-bottom: var(--space-8);
}

/* ==========================================================================
   20. Mobile Fixed Bottom CTA
   ========================================================================== */

.mobile-bottom-cta {
  display: none;
}

@media (max-width: 768px) {
  .mobile-bottom-cta {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed-cta);
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    padding: var(--space-3) var(--space-4);
    padding-bottom: calc(var(--space-3) + env(safe-area-inset-bottom, 0px));
    gap: var(--space-2);
    transform: translateY(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .mobile-bottom-cta.is-hidden {
    transform: translateY(100%);
  }

  .mobile-bottom-cta .btn {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    justify-content: center;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  /* Body padding to prevent CTA bar from covering content */
  body {
    padding-bottom: 64px;
  }
}

/* ==========================================================================
   21. Animations — design-system.md #10 準拠
   ========================================================================== */

.fade-in-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .fade-in-up {
    opacity: 1;
    transform: none;
    transition: none;
  }

  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================================================
   22. Search Form
   ========================================================================== */

.search-form {
  display: flex;
  gap: var(--space-2);
}

.search-form__input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition-fast);
}

.search-form__input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-form__submit {
  padding: var(--space-3) var(--space-5);
  background: var(--color-accent);
  color: var(--color-text-inverse);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.search-form__submit:hover {
  background: var(--color-accent-dark);
}

/* ==========================================================================
   23. WordPress Core Overrides
   ========================================================================== */

.wp-block-image {
  margin: var(--space-6) 0;
}

.wp-block-image img {
  border-radius: var(--radius-lg);
}

.alignfull {
  width: 100vw;
  max-width: 100vw;
  margin-left: calc(-50vw + 50%);
}

.alignwide {
  max-width: calc(var(--width-article) + 200px);
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   24. Print Styles
   ========================================================================== */

/* ============================================================
   Prompt Copy Block
   記事内コードブロックに自動付与されるコピーボタンUIのスタイル
   ============================================================ */

.prompt-copy-wrapper {
  position: relative;
  margin: 20px 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #e2e8f0;
}

.prompt-copy-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 14px;
  background: #f1f5f9;
  border-bottom: 1px solid #e2e8f0;
}

.prompt-copy-label {
  font-size: 12px;
  font-weight: 700;
  color: #64748b;
  letter-spacing: 0.05em;
}

.prompt-copy-btn {
  background: #1a237e;
  color: #fff;
  border: none;
  padding: 4px 14px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s ease;
  white-space: nowrap;
  line-height: 1.6;
}

.prompt-copy-btn:hover {
  background: #283593;
}

.prompt-copy-btn.is-copied {
  background: #059669;
}

.prompt-copy-wrapper .wp-block-code,
.prompt-copy-wrapper pre {
  margin: 0 !important;
  border-radius: 0 !important;
  border: none !important;
  padding: 16px !important;
  background: #f8fafc !important;
  font-size: 14px !important;
  line-height: 1.7 !important;
  color: #374151 !important;
  white-space: pre-wrap !important;
  word-break: break-all !important;
}

/* ============================================================ */

@media print {
  .site-header,
  .site-footer,
  .sidebar,
  .cta-banner,
  .hero,
  .category-tabs,
  .mobile-bottom-cta,
  .mobile-nav,
  .search-overlay,
  .post-cta,
  .related-posts {
    display: none !important;
  }

  body {
    font-size: 12pt;
    line-height: 1.6;
    color: #000;
  }

  .post-content {
    max-width: 100%;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}