/*
Theme Name: 広告枠マッチング
Theme URI: https://github.com/yama227/jobmatching
Author: Your Name
Author URI: https://github.com/yama227
Description: 広告枠を売りたいサイト運営者と、広告枠を買いたい広告主をつなぐマッチングプラットフォーム。Zennにインスパイアされたシンプルでモダンなデザイン。
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: adspace-matching
Tags: marketplace, advertising, custom-post-types, responsive-layout

広告枠マッチング WordPress Theme
Copyright (C) 2026
*/

/* ==========================================================================
   CSS Variables - Zenn-inspired Design System
   ========================================================================== */

:root {
  /* Primary Colors */
  --color-primary: #3EA8FF;
  --color-primary-dark: #0F83FD;
  --color-primary-light: #E8F4FF;

  /* Secondary Colors */
  --color-secondary: #55C500;
  --color-secondary-dark: #45A800;
  --color-secondary-light: #E8FFD6;

  /* Neutral Colors */
  --color-text: #1A1A1A;
  --color-text-secondary: #6E7B85;
  --color-text-muted: #9DAAB3;
  --color-border: #E5E9EC;
  --color-background: #FAFAFA;
  --color-surface: #FFFFFF;

  /* Status Colors */
  --color-success: #55C500;
  --color-warning: #FFB224;
  --color-error: #F43F5E;
  --color-info: #3EA8FF;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --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, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-card: 0 2px 4px rgba(0, 0, 0, 0.05);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Sans", "Noto Sans CJK JP", sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;
  --font-size-4xl: 36px;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Container */
  --container-max-width: 1200px;
  --container-padding: 16px;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
  overflow-x: hidden;
  max-width: 100vw;
}

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

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

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

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

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

ul,
ol {
  list-style: none;
}

/* ==========================================================================
   Typography
   ========================================================================== */

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

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-md); }

p {
  margin-bottom: var(--spacing-md);
}

/* ==========================================================================
   Layout
   ========================================================================== */

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

.container--narrow {
  max-width: 800px;
}

.container--wide {
  max-width: 1400px;
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
}

.site-logo:hover {
  color: var(--color-primary);
}

.site-logo__icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-md);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.main-nav__list {
  display: flex !important;
  flex-direction: row !important;
  align-items: center;
  gap: var(--spacing-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav__list li {
  display: inline-block;
}

.main-nav__list li a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.main-nav__list li a:hover {
  color: var(--color-text);
}

.main-nav__link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.main-nav__link:hover {
  color: var(--color-text);
  background-color: var(--color-background);
}

.main-nav__link--active {
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  color: white;
}

.btn--secondary {
  background-color: var(--color-background);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background-color: var(--color-border);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
}

.btn--ghost:hover {
  background-color: var(--color-background);
  color: var(--color-text);
}

.btn--success {
  background-color: var(--color-success);
  color: white;
}

.btn--success:hover {
  background-color: var(--color-secondary-dark);
  color: white;
}

.btn--lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-md);
}

.btn--sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
}

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

/* ==========================================================================
   Forms
   ========================================================================== */

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-md);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-error);
  margin-top: var(--spacing-xs);
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.card__image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--color-background);
}

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

.card__body {
  padding: var(--spacing-lg);
}

.card__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__title a {
  color: inherit;
}

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

.card__meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.card__description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--spacing-md);
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

.card__price {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

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

/* ==========================================================================
   Ad Space Card (Specific)
   ========================================================================== */

.adspace-card {
  position: relative;
}

.adspace-card__badge {
  position: absolute;
  top: var(--spacing-md);
  left: var(--spacing-md);
  z-index: 1;
}

.adspace-card__favorite {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  z-index: 1;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-full);
  border: none;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.adspace-card__favorite:hover {
  color: var(--color-error);
  transform: scale(1.1);
}

.adspace-card__favorite.is-active {
  color: var(--color-error);
}

.adspace-card__stats {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.adspace-card__stat {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.adspace-card__stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.adspace-card__stat-value {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

/* ==========================================================================
   Badges
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.badge--primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.badge--success {
  background-color: var(--color-secondary-light);
  color: var(--color-secondary-dark);
}

.badge--warning {
  background-color: #FFF4E5;
  color: #B76E00;
}

.badge--error {
  background-color: #FFE4E8;
  color: var(--color-error);
}

.badge--neutral {
  background-color: var(--color-background);
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Grid Layouts
   ========================================================================== */

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

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

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

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

.grid--auto {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

@media (max-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  padding: var(--spacing-3xl) 0;
  text-align: center;
  background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-background) 100%);
}

.hero__title {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__search {
  max-width: 600px;
  margin: 0 auto;
}

.search-box {
  display: flex;
  gap: var(--spacing-sm);
  background-color: var(--color-surface);
  padding: var(--spacing-sm);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.search-box__input {
  flex: 1;
  border: none;
  padding: var(--spacing-md);
  font-size: var(--font-size-md);
}

.search-box__input:focus {
  outline: none;
}

.search-box__btn {
  padding: var(--spacing-md) var(--spacing-xl);
}

/* ==========================================================================
   Section Styles
   ========================================================================== */

.section {
  padding: var(--spacing-3xl) 0;
}

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

.section__title {
  font-size: var(--font-size-2xl);
}

.section__link {
  font-size: var(--font-size-sm);
  font-weight: 600;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-brand {
  max-width: 280px;
}

.footer-brand__description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-md);
}

.footer-nav__title {
  font-size: var(--font-size-sm);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.footer-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-nav__link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer-nav__link:hover {
  color: var(--color-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}

.footer-copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.footer-social__link {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  background-color: var(--color-background);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.footer-social__link:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: span 2;
  }
}

/* ==========================================================================
   Single Ad Space Page
   ========================================================================== */

.adspace-single {
  padding: var(--spacing-xl) 0 var(--spacing-3xl);
}

.adspace-single__grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--spacing-2xl);
  align-items: start;
}

.adspace-single__main {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.adspace-single__image {
  aspect-ratio: 16 / 9;
  background-color: var(--color-background);
}

.adspace-single__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.adspace-single__content {
  padding: var(--spacing-xl);
}

.adspace-single__badges {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.adspace-single__title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-md);
}

.adspace-single__meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-lg);
}

.adspace-single__description {
  line-height: var(--line-height-relaxed);
}

.adspace-single__section {
  margin-top: var(--spacing-xl);
}

.adspace-single__section-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
}

.adspace-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.adspace-stat-item {
  padding: var(--spacing-md);
  background-color: var(--color-background);
  border-radius: var(--radius-md);
}

.adspace-stat-item__label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
}

.adspace-stat-item__value {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

/* Sidebar */
.adspace-single__sidebar {
  position: sticky;
  top: 80px;
}

.adspace-sidebar-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
}

.adspace-sidebar-card__price {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.adspace-sidebar-card__price-unit {
  font-size: var(--font-size-sm);
  font-weight: 400;
  color: var(--color-text-secondary);
}

.adspace-sidebar-card__actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.adspace-sidebar-card__seller {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.seller-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background-color: var(--color-background);
  overflow: hidden;
}

.seller-info__name {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.seller-info__meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

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

  .adspace-single__sidebar {
    position: static;
  }
}

/* ==========================================================================
   Search & Filter
   ========================================================================== */

.search-filters {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.search-filters__form {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: flex-end;
}

.search-filters__field {
  flex: 1;
  min-width: 200px;
}

.search-filters__label {
  display: block;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.search-results__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
}

.search-results__count {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.search-results__sort {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* ==========================================================================
   Pagination
   ========================================================================== */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-2xl);
}

.pagination__item {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.pagination__item:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pagination__item.is-active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.pagination__item.is-disabled {
  opacity: 0.5;
  pointer-events: none;
}

/* ==========================================================================
   User Account Pages
   ========================================================================== */

.account-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--spacing-2xl);
  padding: var(--spacing-xl) 0 var(--spacing-3xl);
}

.account-sidebar {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  height: fit-content;
  position: sticky;
  top: 80px;
}

.account-nav__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-xs);
  transition: all var(--transition-fast);
}

.account-nav__item:hover {
  background-color: var(--color-background);
  color: var(--color-text);
}

.account-nav__item.is-active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.account-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
}

.account-content__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

@media (max-width: 768px) {
  .account-layout {
    grid-template-columns: 1fr;
  }

  .account-sidebar {
    position: static;
  }
}

/* ==========================================================================
   Auth Pages
   ========================================================================== */

.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

.auth-card {
  width: 100%;
  max-width: 400px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
}

.auth-card__logo {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.auth-card__title {
  text-align: center;
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
}

.auth-card__subtitle {
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.auth-card__divider {
  display: flex;
  align-items: center;
  margin: var(--spacing-lg) 0;
}

.auth-card__divider::before,
.auth-card__divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background-color: var(--color-border);
}

.auth-card__divider span {
  padding: 0 var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.auth-card__footer {
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xl);
}

/* ==========================================================================
   Messages
   ========================================================================== */

.messages-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  height: calc(100vh - 64px);
  overflow: hidden;
}

.messages-list {
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
}

.messages-list__header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.message-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.message-item:hover {
  background-color: var(--color-background);
}

.message-item.is-active {
  background-color: var(--color-primary-light);
}

.message-item.is-unread {
  background-color: var(--color-primary-light);
}

.message-item__avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background-color: var(--color-background);
  flex-shrink: 0;
}

.message-item__content {
  flex: 1;
  min-width: 0;
}

.message-item__header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
}

.message-item__name {
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.message-item__time {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.message-item__preview {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.message-thread {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.message-thread__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.message-thread__body {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
  background-color: var(--color-background);
}

.message-bubble {
  max-width: 70%;
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
}

.message-bubble--sent {
  background-color: var(--color-primary);
  color: white;
  margin-left: auto;
  border-bottom-right-radius: var(--radius-sm);
}

.message-bubble--received {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: var(--radius-sm);
}

.message-thread__footer {
  padding: var(--spacing-lg);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.message-input-form {
  display: flex;
  gap: var(--spacing-sm);
}

.message-input-form__input {
  flex: 1;
}

@media (max-width: 768px) {
  .messages-layout {
    grid-template-columns: 1fr;
  }

  .messages-list {
    display: none;
  }

  .messages-list.is-active {
    display: block;
  }
}

/* ==========================================================================
   Alerts & Notifications
   ========================================================================== */

.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
}

.alert--info {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.alert--success {
  background-color: var(--color-secondary-light);
  color: var(--color-secondary-dark);
}

.alert--warning {
  background-color: #FFF4E5;
  color: #B76E00;
}

.alert--error {
  background-color: #FFE4E8;
  color: var(--color-error);
}

/* ==========================================================================
   Loading States
   ========================================================================== */

.skeleton {
  background: linear-gradient(90deg, var(--color-border) 25%, var(--color-background) 50%, var(--color-border) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton--text {
  height: 16px;
  margin-bottom: var(--spacing-sm);
}

.skeleton--title {
  height: 24px;
  width: 60%;
  margin-bottom: var(--spacing-md);
}

.skeleton--image {
  aspect-ratio: 16 / 9;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }

.bg-primary { background-color: var(--color-primary); }
.bg-surface { background-color: var(--color-surface); }
.bg-background { background-color: var(--color-background); }

.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.hidden { display: none; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

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

/* ==========================================================================
   Blog Styles
   ========================================================================== */

.blog-section {
  padding: var(--spacing-2xl) 0;
}

.blog-section .section__header {
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.blog-section .section__subtitle {
  color: var(--color-text-secondary);
  margin: 0;
}

.blog-layout {
  display: flex;
  gap: var(--spacing-2xl);
}

.blog-layout--with-sidebar .blog-main {
  flex: 1;
  min-width: 0;
}

.blog-layout--with-sidebar .sidebar {
  width: 320px;
  flex-shrink: 0;
}

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

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

.blog-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-fast);
}

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

.blog-card__image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.blog-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-fast);
}

.blog-card:hover .blog-card__image img {
  transform: scale(1.05);
}

.blog-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-background);
}

.blog-card__body {
  padding: var(--spacing-lg);
}

.blog-card__meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.blog-card__category {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
}

.blog-card__title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

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

.blog-card__title a:hover {
  color: var(--color-primary);
}

.blog-card__excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.blog-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
}

.blog-card__link:hover {
  text-decoration: underline;
}

/* Blog Sidebar */
.sidebar {
  position: sticky;
  top: 80px;
}

.sidebar .widget {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.sidebar .widget-title,
.sidebar .widget__title {
  font-size: var(--font-size-md);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-primary);
}

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

.sidebar .widget li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

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

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

.sidebar .widget a:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   Mobile Responsive - Header
   ========================================================================== */

@media (max-width: 768px) {
  .site-header__inner {
    flex-wrap: wrap;
    height: auto;
    padding: var(--spacing-sm) 0;
  }

  .main-nav {
    order: 3;
    width: 100%;
    display: none;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-sm);
  }

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

  .main-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .main-nav__list li {
    border-bottom: 1px solid var(--color-border);
  }

  .main-nav__list li:last-child {
    border-bottom: none;
  }

  .main-nav__list li a {
    display: block;
    padding: var(--spacing-md);
  }

  .header-actions {
    gap: var(--spacing-sm);
  }

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

  .mobile-menu-toggle {
    display: flex;
  }

  .user-name {
    display: none;
  }
}

@media (min-width: 769px) {
  .mobile-menu-toggle {
    display: none;
  }
}

/* ==========================================================================
   Mobile Responsive - Blog
   ========================================================================== */

@media (max-width: 1024px) {
  .blog-layout {
    flex-direction: column;
  }

  .blog-layout--with-sidebar .sidebar {
    width: 100%;
    position: static;
  }

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

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

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

  .blog-card__title {
    font-size: var(--font-size-md);
  }
}

/* ==========================================================================
   Mobile Responsive - Footer
   ========================================================================== */

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

  .footer-brand {
    grid-column: 1;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
}

/* ==========================================================================
   Single Blog Post Styles
   ========================================================================== */

.single-post {
  padding: var(--spacing-2xl) 0;
}

.single-post__article {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.single-post__header {
  padding: var(--spacing-xl);
  padding-bottom: 0;
}

.single-post__meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.single-post__category {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  text-decoration: none;
}

.single-post__category:hover {
  background-color: var(--color-primary);
  color: white;
}

.single-post__title {
  font-size: var(--font-size-2xl);
  line-height: 1.3;
  margin-bottom: var(--spacing-lg);
}

.single-post__author {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.single-post__author img {
  border-radius: var(--radius-full);
}

.single-post__author-info {
  display: flex;
  flex-direction: column;
}

.single-post__author-name {
  font-weight: 600;
}

.single-post__reading-time {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.single-post__thumbnail {
  margin: var(--spacing-lg) var(--spacing-xl);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.single-post__thumbnail img {
  width: 100%;
  height: auto;
}

.single-post__content {
  padding: 0 var(--spacing-xl);
  font-size: var(--font-size-md);
  line-height: 1.8;
}

.single-post__content h2 {
  font-size: var(--font-size-xl);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-primary);
}

.single-post__content h3 {
  font-size: var(--font-size-lg);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.single-post__content p {
  margin-bottom: var(--spacing-lg);
}

.single-post__content ul,
.single-post__content ol {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-xl);
}

.single-post__content li {
  margin-bottom: var(--spacing-sm);
}

.single-post__content blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

.single-post__content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--spacing-lg) 0;
}

.single-post__content pre {
  background-color: #1e1e1e;
  color: #d4d4d4;
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

.single-post__content code {
  background-color: var(--color-background);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  font-family: 'SF Mono', Consolas, monospace;
}

.single-post__content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.single-post__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  padding: var(--spacing-xl);
  padding-top: 0;
}

.tag {
  background-color: var(--color-background);
  color: var(--color-text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.tag:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.single-post__share {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin: 0 var(--spacing-xl);
  padding: var(--spacing-lg);
  background-color: var(--color-background);
  border-radius: var(--radius-lg);
}

.single-post__share-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.single-post__share-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

.share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.share-btn--twitter {
  background-color: #1DA1F2;
  color: white;
}

.share-btn--facebook {
  background-color: #4267B2;
  color: white;
}

.share-btn--copy {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.share-btn--copy .icon-check {
  display: none;
}

.share-btn--copy.copied .icon-copy {
  display: none;
}

.share-btn--copy.copied .icon-check {
  display: block;
  color: var(--color-success);
}

.share-btn:hover {
  opacity: 0.8;
  transform: scale(1.05);
}

/* Author Box */
.author-box {
  display: flex;
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
  margin: var(--spacing-xl);
  margin-top: var(--spacing-lg);
  background-color: var(--color-background);
  border-radius: var(--radius-lg);
}

.author-box__avatar img {
  border-radius: var(--radius-full);
}

.author-box__info {
  flex: 1;
}

.author-box__name {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
}

.author-box__bio {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.author-box__link {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  text-decoration: none;
}

.author-box__link:hover {
  text-decoration: underline;
}

/* Related Posts */
.related-posts {
  margin-top: var(--spacing-2xl);
}

.related-posts__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
}

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

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-3xl);
}

.empty-state h2 {
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  color: var(--color-text-secondary);
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-2xl);
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast);
}

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

.pagination .current {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

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

@media (max-width: 640px) {
  .single-post__title {
    font-size: var(--font-size-xl);
  }

  .single-post__header,
  .single-post__content,
  .single-post__tags {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  .single-post__thumbnail,
  .single-post__share,
  .author-box {
    margin-left: var(--spacing-md);
    margin-right: var(--spacing-md);
  }

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

  .single-post__share {
    flex-direction: column;
    align-items: flex-start;
  }

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

/* ==========================================================================
   Content Banner (H2上に表示)
   ========================================================================== */

.content-banner {
  margin: var(--spacing-xl) 0;
  text-align: center;
}

.content-banner a {
  display: inline-block;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.content-banner a:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

.content-banner__image {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}