/* ========================================
   AI学習ナビ for Parents - メインCSS
   全面リニューアル版
   ======================================== */

/* リセット・ベース */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "BIZ UDPGothic", "Meiryo", sans-serif;
  color: #1E293B;
  background: #ffffff;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: #2563EB;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

/* ========================================
   ヘッダー
   ======================================== */

.site-header {
  background: linear-gradient(135deg, #1E40AF 0%, #3B82F6 100%);
  color: white;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.site-header__inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.site-header__logo {
  font-size: 18px;
  font-weight: bold;
  color: white;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__logo:hover {
  text-decoration: none;
  opacity: 0.9;
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-header__nav a {
  color: rgba(255,255,255,0.9);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
  white-space: nowrap;
}

.site-header__nav a:hover {
  color: white;
  text-decoration: none;
}

/* ハンバーガーメニュー */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  padding: 0;
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background: white;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.hamburger.is-open .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.is-open .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger.is-open .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ========================================
   ヒーローセクション
   ======================================== */

.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: url('https://images.unsplash.com/photo-1588072432836-e10032774350?w=1400&h=700&fit=crop') center center / cover no-repeat;
  overflow: hidden;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(30,64,175,0.82) 0%, rgba(59,130,246,0.72) 100%);
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  padding: 60px 24px;
}

.hero__title {
  font-size: 36px;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 20px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.hero__description {
  font-size: 16px;
  color: rgba(255,255,255,0.92);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.8;
}

.hero__cta {
  display: inline-block;
  background: #F97316;
  color: #ffffff;
  font-size: 17px;
  font-weight: bold;
  padding: 16px 48px;
  border-radius: 8px;
  text-decoration: none;
  transition: background-color 0.25s, transform 0.2s, box-shadow 0.25s;
  box-shadow: 0 4px 14px rgba(249,115,22,0.35);
  min-height: 44px;
}

.hero__cta:hover {
  background: #EA580C;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(249,115,22,0.45);
  text-decoration: none;
}

.hero__cta:active {
  transform: translateY(0);
}

/* ========================================
   共通セクションレイアウト
   ======================================== */

.section {
  padding: 72px 20px;
}

.section--white {
  background: #ffffff;
}

.section--gray {
  background: #F8FAFC;
}

.section__inner {
  max-width: 1080px;
  margin: 0 auto;
}

.section__title {
  font-size: 32px;
  color: #1E3A5F;
  text-align: center;
  margin-bottom: 12px;
  line-height: 1.4;
}

.section__subtitle {
  font-size: 15px;
  color: #64748B;
  text-align: center;
  margin-bottom: 48px;
}

.section__title + .feature-cards,
.section__title + .article-grid,
.section__title + .tag-list,
.section__title + .product-grid {
  margin-top: 48px;
}

/* ========================================
   特徴カード（このサイトでわかること）
   ======================================== */

.feature-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  text-align: center;
  padding: 40px 24px;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  transition: box-shadow 0.25s, transform 0.25s;
}

.feature-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  transform: translateY(-4px);
}

.feature-card__icon {
  margin: 0 auto 20px;
  width: 64px;
  height: 64px;
}

.feature-card__title {
  font-size: 18px;
  font-weight: bold;
  color: #1E3A5F;
  margin-bottom: 12px;
}

.feature-card__text {
  font-size: 14px;
  color: #475569;
  line-height: 1.7;
}

/* ========================================
   記事カードグリッド
   ======================================== */

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  display: block;
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  transition: box-shadow 0.25s, transform 0.25s;
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  transform: translateY(-4px);
  text-decoration: none;
}

.article-card--coming-soon {
  opacity: 0.75;
  pointer-events: none;
}

.article-card__thumb {
  width: 100%;
  height: 180px;
  overflow: hidden;
  background: #E2E8F0;
}

.article-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #EFF6FF;
}

.article-card__body {
  padding: 20px;
}

.article-card__title {
  font-size: 16px;
  font-weight: bold;
  color: #1E293B;
  margin-bottom: 8px;
  line-height: 1.5;
}

.article-card__excerpt {
  font-size: 14px;
  color: #64748B;
  line-height: 1.6;
}

/* ========================================
   タグ（悩みで探す）
   ======================================== */

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.tag {
  display: inline-block;
  padding: 10px 20px;
  background: #EFF6FF;
  color: #2563EB;
  font-size: 14px;
  font-weight: 500;
  border-radius: 50px;
  border: 1px solid #BFDBFE;
  transition: background-color 0.2s, color 0.2s, transform 0.2s;
  text-decoration: none;
}

.tag:hover {
  background: #2563EB;
  color: white;
  transform: translateY(-2px);
  text-decoration: none;
}

/* ========================================
   商品カード（アフィリエイト）
   ======================================== */

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  position: relative;
  background: white;
  border-radius: 16px;
  padding: 32px 24px 24px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  text-align: center;
  transition: box-shadow 0.25s, transform 0.25s;
}

.product-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  transform: translateY(-4px);
}

.product-card__badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: #F1F5F9;
  color: #64748B;
  font-size: 11px;
  font-weight: bold;
  padding: 3px 10px;
  border-radius: 4px;
}

.product-card__icon-wrap {
  margin: 0 auto 16px;
  width: 48px;
  height: 48px;
}

.product-card__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.product-card__name {
  font-size: 20px;
  font-weight: bold;
  color: #1E3A5F;
  margin-bottom: 4px;
}

.product-card__sub {
  font-size: 13px;
  color: #64748B;
  margin-bottom: 16px;
}

.product-card__body {
  font-size: 14px;
  color: #475569;
  line-height: 1.7;
  text-align: left;
  margin-bottom: 16px;
}

.product-card__price {
  font-size: 14px;
  font-weight: bold;
  color: #1E3A5F;
  margin-bottom: 20px;
}

/* アフィリエイトボタン */
.affiliate-btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: bold;
  color: white;
  text-align: center;
  text-decoration: none;
  transition: background-color 0.25s, transform 0.2s, box-shadow 0.25s;
  min-height: 44px;
}

.affiliate-btn:hover {
  transform: translateY(-2px);
  text-decoration: none;
}

.affiliate-btn--orange {
  background: #F97316;
  box-shadow: 0 4px 12px rgba(249,115,22,0.3);
}

.affiliate-btn--orange:hover {
  background: #EA580C;
  box-shadow: 0 6px 18px rgba(249,115,22,0.4);
}

.affiliate-btn--blue { background: #3B82F6; }
.affiliate-btn--red { background: #EF4444; }
.affiliate-btn--green { background: #059669; }
.affiliate-btn--amber { background: #D97706; }
.affiliate-btn--purple { background: #7C3AED; }

/* ========================================
   フッター
   ======================================== */

.site-footer {
  background: #1E293B;
  color: #94A3B8;
  padding: 48px 20px 32px;
  font-size: 14px;
}

.site-footer__inner {
  max-width: 1080px;
  margin: 0 auto;
}

.site-footer__links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}

.site-footer__heading {
  font-size: 14px;
  font-weight: bold;
  color: #CBD5E1;
  margin-bottom: 12px;
}

.site-footer__list li {
  margin-bottom: 8px;
}

.site-footer__list a {
  color: #94A3B8;
  font-size: 13px;
  transition: color 0.2s;
}

.site-footer__list a:hover {
  color: #E2E8F0;
  text-decoration: none;
}

.site-footer__bottom {
  border-top: 1px solid #334155;
  padding-top: 24px;
  text-align: center;
}

.site-footer__pr {
  font-size: 12px;
  color: #64748B;
  margin-bottom: 12px;
  line-height: 1.6;
}

.site-footer__copyright {
  font-size: 13px;
  color: #94A3B8;
}

/* PR表記 */
.pr-label {
  display: inline-block;
  background: #F1F5F9;
  color: #64748B;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 16px;
}

/* ========================================
   記事ページ（既存スタイル維持）
   ======================================== */

.main-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.article-header__img {
  width: 100%;
  border-radius: 12px;
  margin-bottom: 24px;
}

.article h1 {
  font-size: 26px;
  line-height: 1.4;
  color: #1E293B;
  margin-bottom: 16px;
}

.article h2 {
  font-size: 22px;
  line-height: 1.4;
  color: #1E3A5F;
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #DBEAFE;
}

.article h3 {
  font-size: 18px;
  color: #334155;
  margin-top: 32px;
  margin-bottom: 12px;
}

.article p {
  margin-bottom: 16px;
  font-size: 16px;
}

.article hr {
  border: none;
  border-top: 1px solid #E2E8F0;
  margin: 32px 0;
}

/* 注意・豆知識・ポイントボックス */
.info-box {
  border-radius: 8px;
  padding: 16px 20px;
  margin: 20px 0;
}

.info-box--tip {
  background: #EFF6FF;
  border-left: 4px solid #3B82F6;
}

.info-box--warning {
  background: #FEF3C7;
  border-left: 4px solid #F59E0B;
}

.info-box--success {
  background: #ECFDF5;
  border-left: 4px solid #10B981;
}

.info-box--highlight {
  background: #F0F9FF;
  border: 2px solid #0EA5E9;
  border-radius: 12px;
}

.info-box__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-weight: bold;
}

/* SVG図解 */
.svg-chart {
  width: 100%;
  max-width: 800px;
  margin: 20px auto;
  display: block;
}

/* 関連記事 */
.related-articles {
  background: #F8FAFC;
  border-radius: 12px;
  padding: 24px;
  margin-top: 40px;
}

.related-articles__title {
  font-size: 16px;
  font-weight: bold;
  margin-bottom: 12px;
  color: #1E3A5F;
}

/* ========================================
   モバイル対応
   ======================================== */

@media (max-width: 768px) {
  /* ヘッダー：ハンバーガー表示 */
  .hamburger {
    display: flex;
  }

  .site-header__nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: #1E40AF;
    flex-direction: column;
    padding: 16px 20px;
    gap: 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  }

  .site-header__nav.is-open {
    display: flex;
  }

  .site-header__nav a {
    padding: 12px 0;
    font-size: 15px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  .site-header__nav a:last-child {
    border-bottom: none;
  }

  /* ヒーロー */
  .hero {
    min-height: 420px;
  }

  .hero__title {
    font-size: 24px;
  }

  .hero__description {
    font-size: 15px;
  }

  .hero__cta {
    font-size: 15px;
    padding: 14px 36px;
  }

  /* セクション */
  .section {
    padding: 48px 16px;
  }

  .section__title {
    font-size: 24px;
  }

  /* 特徴カード */
  .feature-cards {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .feature-card {
    padding: 28px 20px;
  }

  /* 記事カード */
  .article-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* 商品カード */
  .product-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .product-card {
    padding: 24px 16px 20px;
  }

  /* フッター */
  .site-footer__links {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* 記事ページ */
  .article h1 {
    font-size: 22px;
  }

  .article h2 {
    font-size: 19px;
  }

  .affiliate-btn {
    display: block;
    text-align: center;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .feature-cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

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

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