/* ============================================
   AKOOL ガイド - ハブページデザイン
   UX調整版：情報とアクションの視覚的分離
   ============================================ */

:root {
  --black: #1a1a1a;
  --gray-800: #333;
  --gray-600: #555;
  --gray-400: #888;
  --gray-200: #ddd;
  --gray-100: #f0f0f0;
  --gray-50: #f8f8f8;
  --white: #fff;

  --accent: #7c3aed;
  --accent-dark: #6d28d9;
  --accent-light: #f3e8ff;

  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
  --content-width: 680px;
  --wide-width: 960px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.85;
  color: var(--black);
  background: var(--white);
}

/* Typography */
h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--black);
}

h2 {
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--black);
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--black);
}

p {
  margin-bottom: 1rem;
  color: var(--gray-600);
}

strong {
  color: var(--black);
  font-weight: 600;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* Layout */
.container-narrow {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  z-index: 100;
}

.header-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--black);
  text-decoration: none;
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav a {
  font-size: 0.875rem;
  color: var(--gray-600);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--black);
}

/* Header External Link */
.header-external-link {
  color: var(--gray-600);
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  padding: 6px 12px;
  margin-left: 8px;
  white-space: nowrap;
}

.header-external-link:hover {
  color: var(--black);
  border-color: var(--gray-400);
}

/* External Link Icon */
.external-icon {
  display: inline-block;
  margin-left: 3px;
  font-size: 0.85em;
  opacity: 0.7;
}

/* Hero */
.hero {
  padding: 72px 0 64px;
  background: var(--gray-50);
  text-align: center;
}

.hero-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.hero-title {
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1rem;
  color: var(--gray-600);
  max-width: 480px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Sections */
.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--gray-50);
}

.section-title {
  margin-bottom: 8px;
}

.section-lead {
  font-size: 0.9375rem;
  color: var(--gray-400);
  margin-bottom: 32px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-icon {
  font-size: 1.125em;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

.btn-md {
  padding: 12px 24px;
  font-size: 0.9375rem;
}

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

.btn-primary:hover {
  background: var(--accent-dark);
  color: var(--white);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--gray-600);
  border: 1px solid var(--gray-200);
}

.btn-ghost:hover {
  background: var(--white);
  color: var(--black);
  border-color: var(--gray-400);
}

.btn-secondary {
  background: var(--white);
  color: var(--black);
  border: 1px solid var(--gray-200);
}

.btn-secondary:hover {
  background: var(--gray-100);
  color: var(--black);
}

/* Tab UI */
.purpose-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray-600);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.tab-icon {
  font-size: 1rem;
}

.tab-btn:hover {
  border-color: var(--gray-400);
  color: var(--black);
}

.tab-btn.active {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}

.tab-panels {
  min-height: 280px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.panel-content {
  background: var(--gray-50);
  border-radius: 12px;
  padding: 32px;
}

.panel-content h3 {
  margin-bottom: 12px;
}

.panel-content > p {
  margin-bottom: 24px;
}

/* Panel Sections: 機能と記事の分離 */
.panel-section {
  margin-bottom: 20px;
}

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

.panel-section-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

/* Feature Badges: 情報表示（クリック不可） */
.feature-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.feature-badge {
  font-size: 0.8125rem;
  color: var(--gray-600);
  background: var(--white);
  border: 1px solid var(--gray-200);
  padding: 6px 14px;
  border-radius: 20px;
}

/* Article Cards: クリック可能要素 */
.article-cards {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s;
}

.article-card:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.article-card-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--black);
}

.article-card-arrow {
  font-size: 1.125rem;
  color: var(--gray-400);
  transition: transform 0.2s, color 0.2s;
}

.article-card:hover .article-card-arrow {
  color: var(--accent);
  transform: translateX(4px);
}

/* Flow Diagram: 図解 */
.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 24px 20px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.flow-icon {
  font-size: 1.5rem;
}

.flow-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--gray-600);
}

.flow-arrow {
  font-size: 1.25rem;
  color: var(--gray-400);
}

/* Accordion */
.accordion-category {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 32px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--gray-200);
}

.accordion-category:first-of-type {
  margin-top: 0;
}

.accordion {
  margin-top: 0;
  margin-bottom: 8px;
}

.accordion-item {
  border-bottom: 1px solid var(--gray-200);
}

.accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
}

.accordion-header::-webkit-details-marker {
  display: none;
}

.accordion-header-content {
  display: flex;
  align-items: center;
  gap: 12px;
}

.accordion-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--black);
}

.accordion-plan {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--gray-600);
  background: var(--gray-100);
  padding: 3px 8px;
  border-radius: 4px;
}

.accordion-plan.accent {
  color: var(--accent-dark);
  background: var(--accent-light);
}

.accordion-icon {
  width: 20px;
  height: 20px;
  position: relative;
  flex-shrink: 0;
}

.accordion-icon::before,
.accordion-icon::after {
  content: '';
  position: absolute;
  background: var(--gray-400);
  transition: transform 0.2s;
}

.accordion-icon::before {
  width: 12px;
  height: 2px;
  top: 9px;
  left: 4px;
}

.accordion-icon::after {
  width: 2px;
  height: 12px;
  top: 4px;
  left: 9px;
}

details[open] .accordion-icon::after {
  transform: rotate(90deg);
}

.accordion-body {
  padding: 0 0 20px;
}

.accordion-body p {
  font-size: 0.9375rem;
  margin-bottom: 8px;
}

.accordion-note {
  font-size: 0.8125rem;
  color: var(--gray-400);
  margin: 0;
}

.accordion-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
}

.accordion-link:hover {
  text-decoration: underline;
}

.accordion-body p:last-child {
  margin-bottom: 0;
}

/* Premium Benefits */
.premium-benefits {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.benefit-item {
  display: flex;
  gap: 14px;
  padding: 20px;
  background: var(--gray-50);
  border-radius: 12px;
}

.benefit-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.benefit-content {
  flex: 1;
}

.benefit-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--black);
  margin-bottom: 4px;
}

.benefit-desc {
  font-size: 0.8125rem;
  color: var(--gray-600);
  margin: 0;
  line-height: 1.6;
}

.premium-cta {
  text-align: center;
}

/* Info Cards: 安心ブロック */
.info-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.info-card {
  background: var(--gray-50);
  border-radius: 12px;
  padding: 20px;
}

.info-card-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.info-card-text {
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-bottom: 12px;
  line-height: 1.7;
}

.info-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  transition: color 0.2s;
}

.info-card-link:hover {
  color: var(--accent);
}

.link-arrow {
  transition: transform 0.2s;
}

.info-card-link:hover .link-arrow {
  transform: translateX(4px);
}

/* Compare Cards: 比較記事リンク */
.compare-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.compare-card {
  display: flex;
  flex-direction: column;
  padding: 24px 20px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.2s;
}

.compare-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.compare-card-header {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 8px;
}

.compare-vs {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-400);
  text-transform: uppercase;
}

.compare-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--black);
}

.compare-card-desc {
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-bottom: 16px;
  flex-grow: 1;
}

.compare-card-action {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
}

.compare-card:hover .compare-card-action {
  color: var(--accent-dark);
}

/* FAQ */
.faq-list {
  margin-top: 24px;
}

.faq-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--gray-200);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-q {
  font-size: 1rem;
  font-weight: 600;
  color: var(--black);
  margin-bottom: 8px;
}

.faq-a {
  font-size: 0.9375rem;
  color: var(--gray-600);
  margin: 0;
}

/* CTA Section */
.cta-section {
  background: var(--black);
  text-align: center;
  padding: 56px 0;
}

.cta-text {
  color: var(--gray-400);
  font-size: 1rem;
  margin-bottom: 20px;
}

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

.cta-section .btn-primary:hover {
  background: var(--gray-100);
  color: var(--black);
}

/* Footer */
.site-footer {
  background: var(--gray-50);
  border-top: 1px solid var(--gray-200);
}

.footer-inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 48px 20px 24px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-section h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--black);
  margin-bottom: 12px;
}

.footer-section p {
  font-size: 0.8125rem;
  color: var(--gray-400);
  margin: 0;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 8px;
}

.footer-section a {
  font-size: 0.8125rem;
  color: var(--gray-400);
  text-decoration: none;
}

.footer-section a:hover {
  color: var(--black);
}

.footer-bottom {
  padding-top: 20px;
  border-top: 1px solid var(--gray-200);
}

.footer-copyright {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-bottom: 12px;
}

.footer-disclaimer {
  font-size: 0.6875rem;
  color: var(--gray-400);
  line-height: 1.7;
  margin: 0;
}

/* Footer Brand Section */
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-site-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--black);
  margin: 0;
}

.footer-logo-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}

.footer-by {
  font-size: 0.75rem;
  color: var(--gray-400);
}

.footer-logo {
  height: 22px;
  max-height: 22px;
  width: auto;
  max-width: 120px;
  opacity: 0.85;
  transition: opacity 0.2s;
  object-fit: contain;
}

.footer-logo-link:hover .footer-logo {
  opacity: 1;
}

.footer-desc {
  font-size: 0.8125rem;
  color: var(--gray-400);
  margin: 4px 0 0;
}

/* External Link Styling */
.external-link {
  display: inline-flex;
  align-items: center;
}

/* Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .header-inner {
    flex-direction: column;
    gap: 12px;
  }

  .site-nav {
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .header-external-link {
    display: none;
  }

  .hero {
    padding: 56px 0 48px;
  }

  .section {
    padding: 48px 0;
  }

  .purpose-tabs {
    gap: 6px;
  }

  .tab-btn {
    padding: 8px 14px;
    font-size: 0.875rem;
  }

  .tab-icon {
    font-size: 0.875rem;
  }

  .panel-content {
    padding: 24px 20px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-actions .btn {
    width: 100%;
    max-width: 280px;
  }

  .flow-diagram {
    gap: 8px;
    padding: 20px 16px;
  }

  .flow-icon {
    font-size: 1.25rem;
  }

  .flow-label {
    font-size: 0.75rem;
  }

  .flow-arrow {
    font-size: 1rem;
  }

  .premium-benefits {
    grid-template-columns: 1fr;
  }

  .info-cards {
    grid-template-columns: 1fr;
  }

  .compare-cards {
    grid-template-columns: 1fr;
  }

  .compare-card {
    padding: 20px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}