/*
Theme Name: AI導入DB
Theme URI: https://ai-donyuu-db.com
Author: Link Inc.
Author URI: https://ai-donyuu-db.com
Description: AI導入支援会社データベースメディアのオリジナルWordPressテーマ
Version: 1.2.7
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: aidb
*/

/* ============================================
   DESIGN SYSTEM
   ============================================ */

:root {
  /* Colors */
  --color-primary: #0A1628;
  --color-primary-light: #132241;
  --color-secondary: #2563EB;
  --color-secondary-hover: #1D4ED8;
  --color-secondary-light: #DBEAFE;
  --color-accent: #10B981;
  --color-accent-hover: #059669;
  --color-surface: #F8FAFC;
  --color-surface-alt: #F1F5F9;
  --color-card: #FFFFFF;
  --color-text: #1E293B;
  --color-text-sub: #64748B;
  --color-text-white: #F8FAFC;
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;

  /* Gradients */
  --gradient-hero: linear-gradient(135deg, #0A1628 0%, #1E3A5F 50%, #2563EB 100%);
  --gradient-card-hover: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(16, 185, 129, 0.05) 100%);
  --gradient-cta: linear-gradient(135deg, #2563EB 0%, #1D4ED8 100%);
  --gradient-accent: linear-gradient(135deg, #10B981 0%, #059669 100%);

  /* Typography */
  --font-heading: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', sans-serif;
  --font-body: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-en: 'Inter', sans-serif;

  --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;

  --leading-tight: 1.35;
  --leading-normal: 1.8;
  --leading-relaxed: 2.0;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --sidebar-width: 320px;
  --header-height: 72px;

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 10px 30px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.06);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}


/* ============================================
   RESET & BASE
   ============================================ */

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

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

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

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

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

a:hover {
  color: var(--color-secondary-hover);
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: var(--leading-tight);
  color: var(--color-text);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p {
  margin-bottom: var(--space-4);
}

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

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


/* ============================================
   LAYOUT
   ============================================ */

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

.container--narrow {
  max-width: var(--container-narrow);
}

.content-area {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--space-10);
  align-items: start;
}

@media (max-width: 1024px) {
  .content-area {
    grid-template-columns: 1fr;
  }
}


/* ============================================
   HEADER
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-primary);
  height: var(--header-height);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.site-logo__icon {
  width: 36px;
  height: 36px;
}

.site-logo__text {
  font-family: var(--font-en);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text-white);
  letter-spacing: -0.02em;
}

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

/* Navigation */
.nav-main {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-main__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-main__link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.nav-main__link--active {
  color: #fff;
  background: rgba(37, 99, 235, 0.2);
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle__bar {
  width: 100%;
  height: 2px;
  background: var(--color-text-white);
  border-radius: 2px;
  transition: all var(--transition-base);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-main {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-6);
    background: var(--color-primary);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: 999;
  }

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

  .nav-main__link {
    padding: var(--space-4);
    font-size: var(--text-base);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 0;
  }
}


/* ============================================
   HERO
   ============================================ */

.hero {
  position: relative;
  background: var(--gradient-hero);
  padding: var(--space-24) 0 var(--space-20);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.1) 0%, transparent 40%);
  pointer-events: none;
}

/* Animated grid background */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  animation: heroGridDrift 20s linear infinite;
}

@keyframes heroGridDrift {
  0% { transform: translate(0, 0); }
  100% { transform: translate(60px, 60px); }
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(37, 99, 235, 0.15);
  border: 1px solid rgba(37, 99, 235, 0.3);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-secondary-light);
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.6s ease both;
}

.hero__badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

.hero__title {
  font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl));
  font-weight: 900;
  color: var(--color-text-white);
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero__title em {
  font-style: normal;
  background: linear-gradient(135deg, #60A5FA, #34D399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__description {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-8);
  line-height: var(--leading-relaxed);
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.3s both;
}

.hero__stats {
  display: flex;
  justify-content: center;
  gap: var(--space-12);
  margin-top: var(--space-12);
  animation: fadeInUp 0.6s ease 0.4s both;
}

.hero__stat {
  text-align: center;
}

.hero__stat-number {
  font-family: var(--font-en);
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-text-white);
}

.hero__stat-label {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  margin-top: var(--space-1);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
  border: none;
  cursor: pointer;
}

.btn--primary {
  background: var(--gradient-cta);
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.btn--primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.45);
}

.btn--secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-white);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn--secondary:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
  transform: translateY(-2px);
}

.btn--outline {
  background: transparent;
  color: var(--color-secondary);
  border: 1.5px solid var(--color-secondary);
}

.btn--outline:hover {
  background: var(--color-secondary);
  color: #fff;
  transform: translateY(-2px);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

.btn--icon {
  padding: var(--space-3);
  border-radius: var(--radius-md);
}


/* ============================================
   CATEGORY NAVIGATION
   ============================================ */

.category-nav {
  padding: var(--space-16) 0;
}

.category-nav__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: var(--space-4);
}

.category-nav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-4);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition-base);
}

.category-nav__item:hover {
  color: var(--color-secondary);
  border-color: var(--color-secondary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.category-nav__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-secondary-light);
  border-radius: var(--radius-md);
  font-size: var(--text-2xl);
  transition: all var(--transition-base);
}

.category-nav__item:hover .category-nav__icon {
  background: var(--color-secondary);
  color: #fff;
  transform: scale(1.1);
}

.category-nav__label {
  font-size: var(--text-sm);
  font-weight: 600;
  text-align: center;
}

.category-nav__count {
  font-size: var(--text-xs);
  color: var(--color-text-sub);
}


/* ============================================
   SECTION HEADERS
   ============================================ */

.section {
  padding: var(--space-16) 0;
}

.section--alt {
  background: var(--color-card);
}

.section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
}

.section__title {
  font-size: var(--text-2xl);
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.section__title::before {
  content: '';
  width: 4px;
  height: 28px;
  background: var(--gradient-cta);
  border-radius: 2px;
}

.section__more {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-sub);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.section__more:hover {
  color: var(--color-secondary);
}


/* ============================================
   ARTICLE CARDS
   ============================================ */

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

@media (max-width: 640px) {
  .article-grid {
    grid-template-columns: 1fr;
  }
}

.article-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
  display: block;
}

.article-card:hover {
  color: inherit;
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: transparent;
}

.article-card__thumbnail {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-surface-alt);
}

.article-card__thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.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);
  background: var(--color-secondary);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
}

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

.article-card__title {
  font-size: var(--text-base);
  font-weight: 700;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-3);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.article-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-sub);
}

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

/* Featured card (first article, larger) */
.article-card--featured {
  grid-column: 1 / -1;
}

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

/* Horizontal card (sidebar/related) */
.article-card--horizontal {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 0;
}

.article-card--horizontal .article-card__thumbnail {
  aspect-ratio: 1;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

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

.article-card--horizontal .article-card__title {
  font-size: var(--text-sm);
  -webkit-line-clamp: 3;
}


/* ============================================
   SIDEBAR
   ============================================ */

.sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-6));
}

.sidebar__widget {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.sidebar__widget-title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.sidebar__category-list li {
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar__category-list li:last-child {
  border-bottom: none;
}

.sidebar__category-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-2);
  color: var(--color-text);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
}

.sidebar__category-list a:hover {
  color: var(--color-secondary);
  padding-left: var(--space-4);
}

.sidebar__category-count {
  font-size: var(--text-xs);
  color: var(--color-text-sub);
  background: var(--color-surface);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}


/* ============================================
   WORDPRESS DEFAULT WIDGETS
   ============================================ */

/* Base widget container (WordPress adds .widget class) */
.sidebar .widget {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

/* Widget titles (WordPress uses .widget-title or h2/h3) */
.sidebar .widget-title,
.sidebar .widget > h2,
.sidebar .widget > h3 {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Widget lists (categories, archives, recent posts, meta) */
.sidebar .widget ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar .widget ul li {
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar .widget ul li:last-child {
  border-bottom: none;
}

.sidebar .widget ul li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-2);
  color: var(--color-text);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.sidebar .widget ul li a:hover {
  color: var(--color-secondary);
  padding-left: var(--space-4);
}

/* Nested lists (sub-categories) */
.sidebar .widget ul ul {
  padding-left: var(--space-4);
}

.sidebar .widget ul ul li a {
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-2);
}

/* Post count in parentheses */
.sidebar .widget li .count,
.sidebar .widget li .post-count {
  font-size: var(--text-xs);
  color: var(--color-text-sub);
  background: var(--color-surface);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  margin-left: auto;
}

/* Search widget */
.sidebar .widget_search .search-form,
.sidebar .widget_search form {
  display: flex;
  gap: var(--space-2);
}

.sidebar .widget_search input[type="search"],
.sidebar .widget_search .search-field {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  background: var(--color-card);
  transition: border-color var(--transition-fast);
}

.sidebar .widget_search input[type="search"]:focus,
.sidebar .widget_search .search-field:focus {
  outline: none;
  border-color: var(--color-secondary);
}

.sidebar .widget_search input[type="submit"],
.sidebar .widget_search .search-submit {
  padding: var(--space-2) var(--space-4);
  background: var(--gradient-cta);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sidebar .widget_search input[type="submit"]:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Recent Posts widget */
.sidebar .widget_recent_entries li {
  padding: var(--space-3) var(--space-2);
}

.sidebar .widget_recent_entries li a {
  display: block;
  padding: 0;
  font-weight: 500;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-1);
}

.sidebar .widget_recent_entries .post-date {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-sub);
}

/* Calendar widget */
.sidebar .widget_calendar table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.sidebar .widget_calendar th,
.sidebar .widget_calendar td {
  text-align: center;
  padding: var(--space-2);
}

.sidebar .widget_calendar th {
  font-weight: 600;
  color: var(--color-text-sub);
  font-size: var(--text-xs);
}

.sidebar .widget_calendar td a {
  color: var(--color-secondary);
  font-weight: 600;
}

/* Tag Cloud widget */
.sidebar .widget_tag_cloud .tagcloud a {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  margin: 0 var(--space-1) var(--space-2) 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs) !important;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.sidebar .widget_tag_cloud .tagcloud a:hover {
  background: var(--color-secondary);
  border-color: var(--color-secondary);
  color: #fff;
}

/* Text widget, Custom HTML widget */
.sidebar .widget_text .textwidget,
.sidebar .widget_custom_html .custom-html-widget {
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: var(--color-text);
}

.sidebar .widget_text .textwidget p:last-child,
.sidebar .widget_custom_html .custom-html-widget p:last-child {
  margin-bottom: 0;
}

/* RSS widget */
.sidebar .widget_rss li {
  padding: var(--space-3) var(--space-2);
}

.sidebar .widget_rss .rss-date {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-sub);
  margin-top: var(--space-1);
}

/* Navigation menu widget */
.sidebar .widget_nav_menu .menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ============================================
   BLOCK-BASED WIDGETS (WP 5.8+)
   ============================================ */

/* Reset wp-block-group inside sidebar to prevent double card nesting.
   The outer section/div catch-all at the bottom handles the card styling. */
.sidebar .wp-block-group {
  background: none;
  border: none;
  border-radius: 0;
  padding: 0;
  margin-bottom: 0;
}

/* Block widget headings */
.sidebar .wp-block-heading,
.sidebar .wp-block-group > h2,
.sidebar .wp-block-group > h3,
.sidebar > section > h2,
.sidebar > div > h2,
.sidebar > section > h3,
.sidebar > div > h3 {
  font-size: var(--text-base) !important;
  font-weight: 700;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Block Latest Posts */
.sidebar .wp-block-latest-posts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar .wp-block-latest-posts li {
  border-bottom: 1px solid var(--color-border-light);
  padding: var(--space-3) var(--space-2);
}

.sidebar .wp-block-latest-posts li:last-child {
  border-bottom: none;
}

.sidebar .wp-block-latest-posts li a {
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: var(--leading-tight);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.sidebar .wp-block-latest-posts li a:hover {
  color: var(--color-secondary);
}

.sidebar .wp-block-latest-posts__post-date {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-sub);
  margin-top: var(--space-1);
}

/* Block Categories */
.sidebar .wp-block-categories,
.sidebar .wp-block-categories-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar .wp-block-categories li,
.sidebar .wp-block-categories-list li {
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar .wp-block-categories li:last-child,
.sidebar .wp-block-categories-list li:last-child {
  border-bottom: none;
}

.sidebar .wp-block-categories li a,
.sidebar .wp-block-categories-list li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-2);
  color: var(--color-text);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.sidebar .wp-block-categories li a:hover,
.sidebar .wp-block-categories-list li a:hover {
  color: var(--color-secondary);
  padding-left: var(--space-4);
}

/* Block Archives */
.sidebar .wp-block-archives,
.sidebar .wp-block-archives-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar .wp-block-archives li,
.sidebar .wp-block-archives-list li {
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar .wp-block-archives li:last-child,
.sidebar .wp-block-archives-list li:last-child {
  border-bottom: none;
}

.sidebar .wp-block-archives li a,
.sidebar .wp-block-archives-list li a {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-2);
  color: var(--color-text);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.sidebar .wp-block-archives li a:hover,
.sidebar .wp-block-archives-list li a:hover {
  color: var(--color-secondary);
  padding-left: var(--space-4);
}

/* Block Search - reset card (outer div/section handles it) */
.sidebar .wp-block-search {
  background: none !important;
  border: none !important;
  border-radius: 0 !important;
  padding: 0 !important;
  margin-bottom: 0 !important;
  display: block !important;
  flex-wrap: wrap !important;
}

.sidebar .wp-block-search__label {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-secondary);
  display: block;
}

.sidebar .wp-block-search__inside-wrapper {
  display: flex;
  gap: var(--space-2);
}

.sidebar .wp-block-search__input {
  flex: 1;
  min-width: 0;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-family: var(--font-body);
}

.sidebar .wp-block-search__input:focus {
  outline: none;
  border-color: var(--color-secondary);
}

.sidebar .wp-block-search__button {
  padding: var(--space-2) var(--space-4);
  background: var(--gradient-cta);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

/* Block Tag Cloud */
.sidebar .wp-block-tag-cloud a {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  margin: 0 var(--space-1) var(--space-2) 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs) !important;
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.sidebar .wp-block-tag-cloud a:hover {
  background: var(--color-secondary);
  border-color: var(--color-secondary);
  color: #fff;
}

/* Catch-all: style any direct section/div children of sidebar as widget cards */
.sidebar > section,
.sidebar > div:not(.sidebar__widget) {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

/* Universal list styling inside sidebar */
.sidebar > section ul,
.sidebar > div:not(.sidebar__widget) ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar > section ul li,
.sidebar > div:not(.sidebar__widget) ul li {
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar > section ul li:last-child,
.sidebar > div:not(.sidebar__widget) ul li:last-child {
  border-bottom: none;
}

.sidebar > section ul li a,
.sidebar > div:not(.sidebar__widget) ul li a {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-2);
  color: var(--color-text);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.sidebar > section ul li a:hover,
.sidebar > div:not(.sidebar__widget) ul li a:hover {
  color: var(--color-secondary);
  padding-left: var(--space-4);
}


/* ============================================
   SINGLE ARTICLE
   ============================================ */

.article-header {
  padding: var(--space-12) 0 var(--space-8);
}

.article-header__category {
  display: inline-flex;
  padding: var(--space-1) var(--space-4);
  background: var(--color-secondary-light);
  color: var(--color-secondary);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.article-header__title {
  font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: var(--space-4);
}

.article-header__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-sub);
}

/* Article content */
.article-content {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-10) var(--space-8);
}

.article-content h2 {
  font-size: var(--text-2xl);
  margin: var(--space-12) 0 var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 3px solid var(--color-secondary);
}

.article-content h2:first-child {
  margin-top: 0;
}

.article-content h3 {
  font-size: var(--text-xl);
  margin: var(--space-8) 0 var(--space-4);
  padding-left: var(--space-4);
  border-left: 4px solid var(--color-accent);
}

.article-content h4 {
  font-size: var(--text-lg);
  margin: var(--space-6) 0 var(--space-3);
}

.article-content p {
  margin-bottom: var(--space-5);
  line-height: var(--leading-relaxed);
}

.article-content ul,
.article-content ol {
  margin: var(--space-4) 0;
  padding-left: var(--space-6);
}

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

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

.article-content li {
  margin-bottom: var(--space-2);
  line-height: var(--leading-normal);
}

.article-content blockquote {
  margin: var(--space-6) 0;
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface);
  border-left: 4px solid var(--color-secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--color-text-sub);
}

.article-content table {
  width: 100%;
  margin: var(--space-6) 0;
  border-collapse: collapse;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.article-content th {
  background: var(--color-primary);
  color: var(--color-text-white);
  font-weight: 600;
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-size: var(--text-sm);
}

.article-content td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.article-content tr:nth-child(even) {
  background: var(--color-surface);
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-surface);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--color-secondary);
}

.article-content pre {
  margin: var(--space-6) 0;
  padding: var(--space-5);
  background: var(--color-primary);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.article-content pre code {
  background: none;
  color: var(--color-text-white);
  padding: 0;
}

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

@media (max-width: 768px) {
  .article-content {
    padding: var(--space-6) var(--space-5);
  }
}


/* ============================================
   TABLE OF CONTENTS
   ============================================ */

.toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
}

.toc__title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

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

.toc__list li {
  counter-increment: toc-counter;
}

.toc__list a {
  display: block;
  padding: var(--space-2) 0;
  color: var(--color-text);
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--color-border-light);
  transition: all var(--transition-fast);
}

.toc__list a::before {
  content: counter(toc-counter) '.';
  color: var(--color-secondary);
  font-weight: 600;
  margin-right: var(--space-2);
}

.toc__list a:hover {
  color: var(--color-secondary);
  padding-left: var(--space-3);
}

.toc__list .toc__sub-list {
  padding-left: var(--space-6);
}

.toc__list .toc__sub-list a {
  font-size: var(--text-xs);
}

.toc__list .toc__sub-list a::before {
  content: '—';
  color: var(--color-text-sub);
}


/* ============================================
   BREADCRUMB
   ============================================ */

.breadcrumb {
  padding: var(--space-4) 0;
  font-size: var(--text-sm);
  color: var(--color-text-sub);
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

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

.breadcrumb__item:not(:last-child)::after {
  content: '›';
  color: var(--color-text-sub);
}

.breadcrumb__link {
  color: var(--color-text-sub);
}

.breadcrumb__link:hover {
  color: var(--color-secondary);
}

.breadcrumb__current {
  color: var(--color-text);
  font-weight: 500;
}


/* ============================================
   PAGINATION
   ============================================ */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-12) 0;
}

.pagination a,
.pagination span {
  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;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.pagination a {
  color: var(--color-text);
  background: var(--color-card);
  border: 1px solid var(--color-border);
}

.pagination a:hover {
  color: var(--color-secondary);
  border-color: var(--color-secondary);
  transform: translateY(-2px);
}

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


/* ============================================
   FOOTER
   ============================================ */

.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.6);
  padding: var(--space-16) 0 var(--space-8);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 480px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }
}

.footer__brand-name {
  font-family: var(--font-en);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text-white);
  margin-bottom: var(--space-3);
}

.footer__brand-name span {
  color: var(--color-secondary);
}

.footer__brand-desc {
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.footer__heading {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer__links li {
  margin-bottom: var(--space-2);
}

.footer__links a {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-text-white);
}

.footer__bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
}

@media (max-width: 640px) {
  .footer__bottom {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }
}


/* ============================================
   BACK TO TOP
   ============================================ */

.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-cta);
  color: #fff;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 100;
  font-size: var(--text-lg);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  color: #fff;
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
}


/* ============================================
   SEARCH PAGE
   ============================================ */

.search-header {
  padding: var(--space-12) 0 var(--space-8);
  text-align: center;
}

.search-header__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-6);
}

.search-header__form {
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  gap: var(--space-3);
}

.search-header__input {
  flex: 1;
  padding: var(--space-3) var(--space-5);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  transition: border-color var(--transition-fast);
  background: var(--color-card);
}

.search-header__input:focus {
  outline: none;
  border-color: var(--color-secondary);
}


/* ============================================
   404 PAGE
   ============================================ */

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

.error-404__code {
  font-family: var(--font-en);
  font-size: 8rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--space-4);
}

.error-404__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.error-404__description {
  color: var(--color-text-sub);
  margin-bottom: var(--space-8);
}


/* ============================================
   CTA BANNER
   ============================================ */

.cta-banner {
  background: var(--gradient-hero);
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-6);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 70%, rgba(37, 99, 235, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 70% 30%, rgba(16, 185, 129, 0.15) 0%, transparent 40%);
  pointer-events: none;
}

.cta-banner__title {
  font-size: var(--text-lg);
  color: var(--color-text-white);
  margin-bottom: var(--space-2);
  position: relative;
}

.cta-banner__description {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
  position: relative;
}

.cta-banner .btn {
  position: relative;
}


/* ============================================
   RELATED ARTICLES
   ============================================ */

.related-articles {
  margin-top: var(--space-12);
}


/* ============================================
   ANIMATIONS (Intersection Observer)
   ============================================ */

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }


/* ============================================
   ARCHIVE HEADER
   ============================================ */

.archive-header {
  padding: var(--space-12) 0 var(--space-8);
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}

.archive-header__title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-3);
}

.archive-header__description {
  color: var(--color-text-sub);
  font-size: var(--text-base);
}

.archive-header__count {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-sub);
}


/* ============================================
   PR NOTICE (Affiliate)
   ============================================ */

.pr-notice {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-sub);
  font-weight: 500;
}


/* ============================================
   CONTACT FORM
   ============================================ */

.contact-form {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.contact-form__group {
  margin-bottom: var(--space-5);
}

.contact-form__label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.contact-form__required {
  font-size: var(--text-xs);
  color: #ef4444;
  font-weight: 500;
  margin-left: var(--space-1);
}

.contact-form__input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  background: var(--color-surface);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.contact-form__textarea {
  resize: vertical;
  min-height: 150px;
}

.contact-form__privacy {
  margin: var(--space-6) 0;
  font-size: var(--text-sm);
  color: var(--color-text-sub);
}

.contact-form__privacy label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.contact-form__privacy input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-secondary);
}

.contact-form__privacy a {
  color: var(--color-secondary);
  text-decoration: underline;
}

.contact-form__submit {
  width: 100%;
}

/* Success state */
.contact-success {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-12) var(--space-8);
  text-align: center;
}

.contact-success__icon {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
}

.contact-success h2 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
}

.contact-success p {
  color: var(--color-text-sub);
}

/* Error state */
.contact-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: var(--space-6);
  color: #ef4444;
  font-size: var(--text-sm);
  font-weight: 500;
}

@media (max-width: 768px) {
  .contact-form {
    padding: var(--space-5);
  }
}

/* 検索ウィジェットの非表示（上部固定以外の重複分） */
.sidebar .widget_search,
.sidebar .wp-block-search {
  display: none !important;
}