/**
 * ベーススタイル
 * design-principles.mdに基づく基本スタイル定義
 */

body {
  font-family: var(--font-family-ja);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-body);
  color: var(--color-dark-gray);
  background-color: var(--color-white);
}

/* ========================================
   タイポグラフィ
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-heading);
  color: var(--color-primary);
}

h1 {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
}

h2 {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
}

h3 {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
}

h4 {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-semibold);
}

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

/* ========================================
   レイアウト
   ======================================== */

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

@media (min-width: 768px) {
  .container {
    padding: 0 var(--padding-horizontal-tablet);
  }
}

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

.section-large {
  padding: var(--spacing-xxl) 0;
}

/* ========================================
   グリッドシステム
   ======================================== */

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

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (min-width: 1024px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

/* ========================================
   ボタン
   ======================================== */

.btn {
  display: inline-block;
  padding: 16px 32px;
  font-size: var(--font-size-button);
  font-weight: var(--font-weight-bold);
  text-align: center;
  border-radius: var(--radius-button);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-light);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 20px rgba(0, 81, 189, 0.35);
}

.btn-primary:active {
  transform: translateY(-1px) scale(1);
  box-shadow: 0 2px 8px rgba(0, 81, 189, 0.25);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-white);
  box-shadow: var(--shadow-button);
}

.btn-accent:hover {
  background-color: #00B396;
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 20px rgba(0, 201, 167, 0.4);
}

.btn-accent:active {
  transform: translateY(-1px) scale(1);
  box-shadow: 0 2px 8px rgba(0, 201, 167, 0.3);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-border);
}

.btn-outline:hover {
  background-color: var(--color-light-gray);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 81, 189, 0.15);
}

.btn-outline:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(0, 81, 189, 0.1);
}

.btn-large {
  padding: 20px 40px;
  font-size: 18px;
}

/* ========================================
   カード
   ======================================== */

.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--spacing-m);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.card-title {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-s);
  color: var(--color-primary);
}

.card-text {
  color: var(--color-dark-gray);
  line-height: var(--line-height-body);
}

/* ========================================
   セクション背景
   ======================================== */

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

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

.bg-primary h1,
.bg-primary h2,
.bg-primary h3,
.bg-primary h4 {
  color: var(--color-white);
}

/* ========================================
   ユーティリティクラス
   ======================================== */

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

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

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

.mb-s { margin-bottom: var(--spacing-s); }
.mb-m { margin-bottom: var(--spacing-m); }
.mb-l { margin-bottom: var(--spacing-l); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-s { margin-top: var(--spacing-s); }
.mt-m { margin-top: var(--spacing-m); }
.mt-l { margin-top: var(--spacing-l); }
.mt-xl { margin-top: var(--spacing-xl); }

/* ========================================
   フェードインアニメーション
   ======================================== */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

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

/* ========================================
   FAQ Section - GEO最適化
   ======================================== */

.faq-hero {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  padding: 80px 0 60px;
  color: white;
  text-align: center;
}

.faq-hero h1 {
  color: white;
  font-size: 42px;
  margin-bottom: 16px;
}

.faq-hero-description {
  font-size: 18px;
  opacity: 0.95;
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.8;
}

.faq-section {
  padding: 80px 0;
  background: #f8fafc;
}

.faq-category {
  margin-bottom: 60px;
}

.faq-category-title {
  font-size: 28px;
  color: var(--color-primary);
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 3px solid var(--color-primary);
  display: flex;
  align-items: center;
}

.faq-category-icon {
  font-size: 32px;
  margin-right: 12px;
}

.faq-list {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  border-radius: 12px;
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
  border-left: 4px solid transparent;
}

.faq-item:hover {
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.15);
  border-left-color: var(--color-primary);
  transform: translateX(4px);
}

.faq-question {
  font-size: 19px;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 16px;
  line-height: 1.6;
  display: flex;
  align-items: flex-start;
}

.faq-question-icon {
  color: var(--color-primary);
  margin-right: 12px;
  font-size: 24px;
  flex-shrink: 0;
}

.faq-answer {
  font-size: 16px;
  color: #475569;
  line-height: 1.8;
  padding-left: 36px;
}

.faq-answer strong {
  color: #1e293b;
  font-weight: 600;
}

.faq-answer ul {
  margin: 16px 0;
  padding-left: 20px;
}

.faq-answer li {
  margin-bottom: 8px;
}

.faq-cta {
  background: white;
  border-radius: 16px;
  padding: 48px;
  text-align: center;
  margin-top: 60px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.faq-cta h2 {
  font-size: 28px;
  margin-bottom: 16px;
}

.faq-cta p {
  font-size: 16px;
  color: #475569;
  margin-bottom: 32px;
  line-height: 1.8;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .faq-hero h1 {
    font-size: 32px;
  }

  .faq-hero-description {
    font-size: 16px;
  }

  .faq-category-title {
    font-size: 24px;
  }

  .faq-item {
    padding: 20px;
  }

  .faq-question {
    font-size: 17px;
  }

  .faq-answer {
    font-size: 15px;
    padding-left: 0;
  }

  .faq-cta {
    padding: 32px 20px;
  }
}

/* ========================================
   パンくずリスト (Breadcrumb)
   ======================================== */
.breadcrumb {
  padding: 16px 0;
  margin-bottom: 24px;
  font-size: 14px;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 8px;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-link {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb-link:hover {
  color: var(--color-dark-gray);
  text-decoration: underline;
}

.breadcrumb-separator {
  margin: 0 8px;
  color: var(--color-light-gray);
}

.breadcrumb-current {
  color: var(--color-dark-gray);
  font-weight: var(--font-weight-semibold);
}