/*!
 * Theme Name: Solar Uragawa Theme
 * Theme URI: https://solar-uragawa.com
 * Description: 太陽光発電の裏側 - オリジナルテーマ
 * Version: 2.0.0
 * Author: NAMI-RENSA
 * Author URI: https://solar-uragawa.com
 * License: GPL v2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: solar-uragawa
 * Domain Path: /languages
 * Requires at least: 5.9
 * Requires PHP: 7.4
 */

/* ===========================
   CSS Custom Properties
   =========================== */
:root {
  --color-primary: #1a5632;
  --color-primary-light: #e8f5e9;
  --color-primary-dark: #0d3b1f;
  --color-dark: #1a1a1a;
  --color-gray: #6b7280;
  --color-gray-light: #d1d5db;
  --color-light: #f8f8f8;
  --color-border: #e5e7eb;
  --color-white: #ffffff;
  --color-accent: #1a5632;

  --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 80px;
  --spacing-4xl: 120px;

  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-dark);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: 0.02em;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(36px, 5vw, 56px);
}

h2 {
  font-size: clamp(28px, 3.5vw, 40px);
}

h3 {
  font-size: 22px;
}

h4 {
  font-size: 18px;
}

p {
  margin-bottom: var(--spacing-md);
  line-height: 2;
}

a {
  color: var(--color-dark);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

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

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

/* ===========================
   Navigation / Header
   =========================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-base);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-xl);
  gap: var(--spacing-2xl);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 18px;
  font-weight: 900;
  color: var(--color-dark);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-logo:hover {
  color: var(--color-dark);
  opacity: 0.7;
}

.site-logo .icon {
  display: none;
}

.site-logo .text {
  font-size: 18px;
}

.header-menu {
  display: none;
  list-style: none;
  gap: var(--spacing-xl);
  align-items: center;
}

.header-menu.show {
  display: flex;
}

.header-menu li a {
  color: var(--color-gray);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.01em;
  transition: color var(--transition-base);
  position: relative;
}

.header-menu li a:hover {
  color: var(--color-dark);
}

.header-menu li a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-dark);
  transition: width var(--transition-base);
}

.header-menu li a:hover::after {
  width: 100%;
}

.header-cta {
  display: none;
  gap: var(--spacing-md);
  align-items: center;
}

.header-cta.show {
  display: flex;
}

.header-toggle {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.header-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background-color: var(--color-dark);
  transition: all var(--transition-base);
}

.header-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

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

.header-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

@media (min-width: 768px) {
  .header-inner {
    padding: var(--spacing-lg) var(--spacing-2xl);
  }

  .header-menu {
    display: flex;
  }

  .header-cta {
    display: flex;
  }

  .header-toggle {
    display: none;
  }
}

/* ===========================
   Buttons
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all var(--transition-base);
  white-space: nowrap;
  letter-spacing: 0.02em;
}

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

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

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

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

.btn-small {
  padding: 10px 24px;
  font-size: 13px;
}

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

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

/* ===========================
   Hero Section
   =========================== */
.hero {
  padding: var(--spacing-4xl) var(--spacing-xl);
  background-color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(26, 86, 50, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.hero-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary);
  letter-spacing: 3px;
  margin-bottom: var(--spacing-sm);
}

.hero-title {
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.hero-description {
  font-size: 17px;
  color: var(--color-gray);
  line-height: 2;
  max-width: 540px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.stat {
  padding: var(--spacing-lg);
  text-align: left;
  border-left: 2px solid var(--color-primary);
}

.stat-value {
  font-size: 36px;
  font-weight: 900;
  color: var(--color-dark);
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 12px;
  color: var(--color-gray);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.hero-image {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--color-light);
  aspect-ratio: 1 / 1.1;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

@media (min-width: 768px) {
  .hero {
    padding: var(--spacing-4xl) var(--spacing-2xl);
  }

  .hero-inner {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===========================
   Section Headings
   =========================== */
.section-heading {
  margin-bottom: var(--spacing-3xl);
}

.section-heading-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary);
  letter-spacing: 3px;
  margin-bottom: var(--spacing-md);
}

.section-heading-title {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 900;
  color: var(--color-dark);
  margin-bottom: 0;
  letter-spacing: -0.03em;
}

.section-heading-description {
  font-size: 15px;
  color: var(--color-gray);
  margin-top: var(--spacing-md);
  line-height: 1.8;
}

/* ===========================
   Sections (Generic)
   =========================== */
.section {
  padding: var(--spacing-4xl) var(--spacing-xl);
}

.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}

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

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

/* ===========================
   Cards
   =========================== */
.card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.card-description {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.9;
}

/* ===========================
   Article/Post Cards
   =========================== */
.post-card {
  background-color: var(--color-white);
  border-radius: 0;
  overflow: hidden;
  border-left: 3px solid var(--color-primary);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  transition: all var(--transition-base);
}

.post-card:hover {
  background-color: var(--color-light);
}

.post-card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.post-category-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-white);
  background-color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.post-meta {
  display: flex;
  gap: var(--spacing-md);
  font-size: 12px;
  color: var(--color-gray);
}

.post-card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--color-dark);
}

.post-card-title a {
  color: var(--color-dark);
}

.post-card-title a:hover {
  color: var(--color-primary);
}

.post-card-excerpt {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.9;
  margin-bottom: var(--spacing-md);
}

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

.post-read-link {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ===========================
   Strength/Feature Cards
   =========================== */
.strengths-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

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

.strength-card {
  background-color: var(--color-white);
  border: none;
  border-radius: 0;
  padding: var(--spacing-2xl) var(--spacing-xl);
  text-align: left;
  transition: all var(--transition-base);
  border-top: 2px solid var(--color-dark);
}

.strength-card:hover {
  background-color: var(--color-white);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.strength-card-icon {
  font-size: 32px;
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background-color: var(--color-dark);
  color: var(--color-white);
  border-radius: var(--radius-full);
}

.strength-card-title {
  font-size: 18px;
  font-weight: 900;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.01em;
}

.strength-card-description {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 2;
}

/* ===========================
   Guide Steps
   =========================== */
.guide-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

@media (min-width: 768px) {
  .guide-steps {
    grid-template-columns: repeat(4, 1fr);
  }
}

.guide-step {
  text-align: left;
  position: relative;
  padding: var(--spacing-xl) 0;
}

.guide-step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--color-dark);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-size: 18px;
  font-weight: 900;
  margin-bottom: var(--spacing-lg);
}

.guide-step-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.guide-step-description {
  font-size: 13px;
  color: var(--color-gray);
  line-height: 2;
}

@media (min-width: 768px) {
  .guide-step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: calc(var(--spacing-xl) + 24px);
    left: calc(100%);
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, var(--color-dark), transparent);
    max-width: 60px;
  }
}

/* ===========================
   Testimonials
   =========================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

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

.testimonial-card {
  background-color: var(--color-white);
  border-radius: 0;
  padding: var(--spacing-xl);
  border-left: 3px solid var(--color-primary);
  transition: all var(--transition-base);
}

.testimonial-card:hover {
  background-color: var(--color-light);
}

.testimonial-text {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 2;
  margin-bottom: var(--spacing-xl);
  font-style: normal;
}

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

.testimonial-avatar {
  width: 40px;
  height: 40px;
  background-color: var(--color-dark);
  border-radius: var(--radius-full);
  overflow: hidden;
}

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

.testimonial-author-name {
  font-weight: 700;
  font-size: 14px;
  color: var(--color-dark);
}

.testimonial-author-title {
  font-size: 12px;
  color: var(--color-gray);
}

/* ===========================
   FAQ Accordion
   =========================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: none;
  border-bottom: 1px solid var(--color-border);
  border-radius: 0;
  margin-bottom: 0;
  overflow: hidden;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: var(--spacing-xl) 0;
  background-color: transparent;
  border: none;
  cursor: pointer;
  font-weight: 700;
  font-size: 15px;
  color: var(--color-dark);
  transition: all var(--transition-base);
  text-align: left;
}

.faq-question:hover {
  color: var(--color-primary);
  background-color: transparent;
}

.faq-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  color: var(--color-dark);
  transition: transform var(--transition-base);
  font-size: 12px;
  flex-shrink: 0;
}

.faq-question.active .faq-toggle {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-answer.show {
  max-height: 500px;
}

.faq-answer-content {
  padding: 0 0 var(--spacing-xl) 0;
  font-size: 14px;
  color: var(--color-gray);
  line-height: 2;
}

/* ===========================
   Editor Profile
   =========================== */
.editor-profile {
  background-color: var(--color-light);
  border-radius: 0;
  padding: var(--spacing-2xl);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  border-top: 2px solid var(--color-dark);
}

@media (min-width: 768px) {
  .editor-profile {
    grid-template-columns: auto 1fr;
  }
}

.editor-image {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background-color: var(--color-border);
  flex-shrink: 0;
}

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

.editor-info-title {
  font-size: 20px;
  font-weight: 900;
  margin-bottom: var(--spacing-md);
}

.editor-info-description {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 2;
  margin-bottom: var(--spacing-md);
}

/* ===========================
   CTA Banner
   =========================== */
.cta-banner {
  background-color: var(--color-dark);
  border-radius: 0;
  padding: var(--spacing-3xl) var(--spacing-2xl);
  text-align: center;
}

.cta-banner-title {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 900;
  margin-bottom: var(--spacing-md);
  color: var(--color-white);
  letter-spacing: -0.02em;
}

.cta-banner-description {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--spacing-xl);
}

.cta-banner .btn-primary {
  background-color: var(--color-white);
  color: var(--color-dark);
  border-color: var(--color-white);
}

.cta-banner .btn-primary:hover {
  background-color: transparent;
  color: var(--color-white);
}

/* ===========================
   Footer
   =========================== */
.site-footer {
  background-color: var(--color-dark);
  border-top: none;
  padding: var(--spacing-3xl) var(--spacing-xl);
  margin-top: 0;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

@media (min-width: 768px) {
  .footer-inner {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-column {
  display: flex;
  flex-direction: column;
}

.footer-column-title {
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--color-white);
  font-size: 14px;
  letter-spacing: 0.02em;
}

.footer-column a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--spacing-sm);
  transition: color var(--transition-base);
}

.footer-column a:hover {
  color: var(--color-white);
}

.footer-column p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.9;
  margin-bottom: 0;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  text-align: left;
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}

/* ===========================
   Blog / Article Pages
   =========================== */
.single-post {
  max-width: 720px;
  margin: 0 auto;
}

.post-header {
  margin-bottom: var(--spacing-2xl);
}

.post-title {
  font-size: clamp(32px, 4vw, 42px);
  line-height: 1.3;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
}

.post-meta-info {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  font-size: 13px;
  color: var(--color-gray);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.post-meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.post-content {
  font-size: 16px;
  line-height: 2;
  color: var(--color-dark);
  margin-bottom: var(--spacing-2xl);
}

.post-content h2 {
  margin-top: var(--spacing-3xl);
  margin-bottom: var(--spacing-lg);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}

.post-content h3 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.post-content p {
  margin-bottom: var(--spacing-lg);
}

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

.post-content li {
  margin-bottom: var(--spacing-md);
}

.post-content blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  font-style: normal;
  color: var(--color-gray);
}

.post-content a {
  color: var(--color-primary);
  font-weight: 600;
  border-bottom: 1px solid var(--color-primary);
}

.post-content a:hover {
  border-bottom-color: transparent;
}

/* ===========================
   Author Box
   =========================== */
.author-box {
  background-color: var(--color-light);
  border-radius: 0;
  padding: var(--spacing-xl);
  margin: var(--spacing-2xl) 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-lg);
  align-items: flex-start;
  border-top: 2px solid var(--color-dark);
}

.author-image {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background-color: var(--color-border);
}

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

.author-info-title {
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.author-info-bio {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.9;
}

/* ===========================
   Related Posts
   =========================== */
.related-posts {
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-2xl);
  border-top: 1px solid var(--color-border);
}

.related-posts-title {
  font-size: 24px;
  margin-bottom: var(--spacing-xl);
  font-weight: 900;
}

.related-posts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

@media (min-width: 768px) {
  .related-posts-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.related-post-item {
  background-color: var(--color-light);
  border-radius: 0;
  overflow: hidden;
  transition: all var(--transition-base);
}

.related-post-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.related-post-thumbnail {
  width: 100%;
  height: 200px;
  background-color: var(--color-border);
  overflow: hidden;
}

.related-post-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.related-post-content {
  padding: var(--spacing-lg);
}

.related-post-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.related-post-title a {
  color: var(--color-dark);
}

.related-post-title a:hover {
  color: var(--color-primary);
}

.related-post-meta {
  font-size: 12px;
  color: var(--color-gray);
}

/* ===========================
   Archive / Category Pages
   =========================== */
.archive-header {
  padding: var(--spacing-3xl) var(--spacing-xl);
  background-color: var(--color-white);
  margin-bottom: var(--spacing-2xl);
  border-bottom: 1px solid var(--color-border);
}

.archive-header-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.archive-title {
  font-size: clamp(32px, 4vw, 42px);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.archive-description {
  font-size: 15px;
  color: var(--color-gray);
}

.archive-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.posts-list {
  margin-bottom: var(--spacing-2xl);
}

/* ===========================
   Pagination
   =========================== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  margin: var(--spacing-2xl) 0;
}

.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition-base);
}

.pagination a:hover {
  border-color: var(--color-dark);
  background-color: var(--color-dark);
  color: var(--color-white);
}

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

/* ===========================
   Search Form
   =========================== */
.search-form {
  display: flex;
  gap: var(--spacing-md);
  max-width: 500px;
}

.search-form input[type="search"] {
  flex: 1;
  padding: 14px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 14px;
  transition: all var(--transition-base);
}

.search-form input[type="search"]:focus {
  outline: none;
  border-color: var(--color-dark);
  box-shadow: none;
}

.search-form button {
  padding: 14px 28px;
  background-color: var(--color-dark);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-full);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-base);
}

.search-form button:hover {
  background-color: var(--color-primary);
}

/* ===========================
   404 Page
   =========================== */
.error-404 {
  text-align: center;
  padding: var(--spacing-4xl) var(--spacing-xl);
}

.error-404-number {
  font-size: 120px;
  font-weight: 900;
  color: var(--color-dark);
  line-height: 1;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.05em;
}

.error-404-title {
  font-size: 32px;
  margin-bottom: var(--spacing-lg);
}

.error-404-description {
  font-size: 15px;
  color: var(--color-gray);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ===========================
   Utility Classes
   =========================== */
.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;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* ===========================
   Print Styles
   =========================== */
@media print {
  .site-header,
  .site-footer,
  .pagination,
  .related-posts,
  .author-box {
    display: none;
  }

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

  a {
    color: #000;
  }
}