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

:root {
  --primary:   #FF6B6B;
  --secondary: #FFE66D;
  --accent:    #4ECDC4;
  --purple:    #A855F7;
  --dark:      #2D2D2D;
  --gray:      #F7F7F7;
  --white:     #FFFFFF;
  --text:      #333333;
  --text-light:#777777;
  --font: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
  --radius: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.10);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.18);
  --transition: all 0.25s ease;
}

body { font-family: var(--font); color: var(--text); background: var(--white); line-height: 1.6; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; font-family: var(--font); }
[v-cloak] { display: none; }

/* ===== ナビゲーション ===== */
.navbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 40px; height: 70px; background: var(--white);
  border-bottom: 3px solid var(--secondary);
  position: sticky; top: 0; z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
}
.navbar__logo {
  font-size: 1.6rem; font-weight: 900; letter-spacing: -1px;
  background: linear-gradient(135deg, var(--primary), var(--purple));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.navbar__nav { display: flex; gap: 32px; list-style: none; }
.navbar__nav a { font-weight: 600; font-size: 0.95rem; color: var(--dark); transition: var(--transition); position: relative; }
.navbar__nav a::after { content:''; position: absolute; bottom: -4px; left: 0; width: 0; height: 3px; background: var(--primary); border-radius: 2px; transition: var(--transition); }
.navbar__nav a:hover::after { width: 100%; }
.navbar__cart {
  position: relative; background: var(--primary); color: white;
  padding: 10px 22px; border-radius: 50px; font-weight: 700; font-size: 0.9rem;
  transition: var(--transition); display: flex; align-items: center; gap: 8px;
}
.navbar__cart:hover { background: #e85555; transform: translateY(-2px); box-shadow: var(--shadow); }
.cart-badge {
  background: var(--secondary); color: var(--dark); border-radius: 50%;
  width: 22px; height: 22px; display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 900;
}

/* ===== ヒーロー ===== */
.hero { background: linear-gradient(135deg,#FFF9E6 0%,#FFE8E8 50%,#E8F4FD 100%); padding: 80px 40px; text-align: center; }
.hero__tag { display: inline-block; background: var(--secondary); color: var(--dark); padding: 6px 18px; border-radius: 50px; font-size: 0.85rem; font-weight: 700; margin-bottom: 20px; }
.hero__title { font-size: 3.2rem; font-weight: 900; line-height: 1.2; margin-bottom: 16px; color: var(--dark); }
.hero__title span { background: linear-gradient(135deg,var(--primary),var(--purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero__subtitle { font-size: 1.15rem; color: var(--text-light); max-width: 520px; margin: 0 auto 36px; }
.hero__btn { background: linear-gradient(135deg,var(--primary),var(--purple)); color: white; padding: 16px 40px; border-radius: 50px; font-size: 1.05rem; font-weight: 700; transition: var(--transition); display: inline-block; box-shadow: 0 4px 20px rgba(255,107,107,0.4); }
.hero__btn:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(255,107,107,0.5); }

/* ===== ギャラリー ===== */
.gallery-section { padding: 60px 40px; max-width: 1200px; margin: 0 auto; }
.section-title { font-size: 2rem; font-weight: 900; margin-bottom: 8px; color: var(--dark); }
.section-title span { color: var(--primary); }
.section-sub { color: var(--text-light); margin-bottom: 40px; font-size: 0.95rem; }
.gallery-filter { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 36px; }
.filter-btn { padding: 8px 20px; border-radius: 50px; border: 2px solid #eee; background: white; font-weight: 600; font-size: 0.88rem; color: var(--text-light); transition: var(--transition); }
.filter-btn:hover, .filter-btn.active { background: var(--dark); color: white; border-color: var(--dark); }
.gallery-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(280px,1fr)); gap: 28px; }

/* ===== 商品カード ===== */
.product-card { background: white; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); cursor: pointer; }
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.product-card__img-wrap { position: relative; overflow: hidden; aspect-ratio: 1/1; }
.product-card__img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.product-card:hover .product-card__img-wrap img { transform: scale(1.05); }
.product-card__badge { position: absolute; top: 12px; left: 12px; background: var(--secondary); color: var(--dark); padding: 4px 12px; border-radius: 50px; font-size: 0.75rem; font-weight: 700; }
.product-card__badge--new { background: var(--accent); color: white; }
.product-card__body { padding: 18px; }
.product-card__title { font-size: 1.05rem; font-weight: 800; margin-bottom: 4px; color: var(--dark); }
.product-card__artist { font-size: 0.82rem; color: var(--text-light); margin-bottom: 12px; }
.product-card__footer { display: flex; align-items: center; justify-content: space-between; }
.product-card__price { font-size: 1.25rem; font-weight: 900; color: var(--primary); }
.product-card__price span { font-size: 0.75rem; font-weight: 400; color: var(--text-light); }
.btn-cart { background: var(--dark); color: white; padding: 8px 18px; border-radius: 50px; font-size: 0.82rem; font-weight: 700; transition: var(--transition); }
.btn-cart:hover { background: var(--primary); }
.btn-cart.in-cart { background: var(--accent); }

/* ===== 商品詳細 ===== */
.detail-page { max-width: 1100px; margin: 0 auto; padding: 48px 40px; }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; margin-top: 32px; }
.detail-img-wrap { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-hover); }
.detail-img-wrap img { width: 100%; aspect-ratio: 1/1; object-fit: cover; }
.detail-info__tag { display: inline-block; background: var(--secondary); color: var(--dark); padding: 5px 14px; border-radius: 50px; font-size: 0.8rem; font-weight: 700; margin-bottom: 14px; }
.detail-info__title { font-size: 2rem; font-weight: 900; line-height: 1.3; margin-bottom: 8px; color: var(--dark); }
.detail-info__artist { color: var(--text-light); margin-bottom: 20px; display: block; }
.detail-info__artist--link { transition: var(--transition); }
.detail-info__artist--link:hover { color: var(--primary); text-decoration: underline; }
.detail-info__desc { font-size: 0.95rem; line-height: 1.8; color: var(--text); margin-bottom: 28px; }
.detail-info__price { font-size: 2.2rem; font-weight: 900; color: var(--primary); margin-bottom: 28px; }
.detail-info__price span { font-size: 1rem; font-weight: 400; color: var(--text-light); }
.detail-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 32px; background: var(--gray); border-radius: 12px; padding: 20px; }
.detail-meta__item label { font-size: 0.75rem; color: var(--text-light); display: block; margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.5px; }
.detail-meta__item span { font-size: 0.92rem; font-weight: 700; color: var(--dark); }
.btn-add-cart { width: 100%; background: linear-gradient(135deg,var(--primary),var(--purple)); color: white; padding: 18px; border-radius: 50px; font-size: 1.1rem; font-weight: 800; transition: var(--transition); box-shadow: 0 4px 20px rgba(255,107,107,0.35); margin-bottom: 12px; }
.btn-add-cart:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(255,107,107,0.5); }
.btn-add-cart:disabled { background: #ccc; box-shadow: none; transform: none; cursor: default; }
.btn-back { background: none; color: var(--text-light); font-size: 0.9rem; display: flex; align-items: center; gap: 6px; transition: var(--transition); }
.btn-back:hover { color: var(--primary); }

/* ===== カート ===== */
.cart-page { max-width: 900px; margin: 0 auto; padding: 48px 40px; }
.page-title { font-size: 2rem; font-weight: 900; margin-bottom: 32px; color: var(--dark); }
.cart-empty { text-align: center; padding: 80px 0; }
.cart-empty__icon { font-size: 4rem; margin-bottom: 16px; }
.cart-empty p { color: var(--text-light); margin-bottom: 24px; }
.cart-items { display: flex; flex-direction: column; gap: 16px; margin-bottom: 32px; }
.cart-item { display: flex; align-items: center; gap: 20px; background: white; border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.cart-item__img { width: 90px; height: 90px; border-radius: 12px; object-fit: cover; flex-shrink: 0; }
.cart-item__info { flex: 1; }
.cart-item__title { font-weight: 800; font-size: 1rem; margin-bottom: 4px; }
.cart-item__artist { font-size: 0.82rem; color: var(--text-light); }
.cart-item__price { font-size: 1.1rem; font-weight: 900; color: var(--primary); }
.btn-remove { background: #fee; color: var(--primary); padding: 8px 14px; border-radius: 8px; font-size: 0.82rem; font-weight: 700; transition: var(--transition); }
.btn-remove:hover { background: var(--primary); color: white; }
.cart-summary { background: var(--gray); border-radius: var(--radius); padding: 28px; }
.cart-summary__row { display: flex; justify-content: space-between; margin-bottom: 12px; font-size: 0.95rem; color: var(--text-light); }
.cart-summary__total { display: flex; justify-content: space-between; font-size: 1.4rem; font-weight: 900; color: var(--dark); border-top: 2px solid #eee; padding-top: 16px; margin-top: 8px; margin-bottom: 24px; }
.btn-checkout { width: 100%; background: linear-gradient(135deg,var(--primary),var(--purple)); color: white; padding: 18px; border-radius: 50px; font-size: 1.1rem; font-weight: 800; transition: var(--transition); box-shadow: 0 4px 20px rgba(255,107,107,0.35); }
.btn-checkout:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(255,107,107,0.5); }

/* ===== チェックアウト ===== */
.checkout-page { max-width: 600px; margin: 0 auto; padding: 48px 40px; }
.checkout-form { background: white; border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 700; margin-bottom: 8px; color: var(--dark); }
.form-group input { width: 100%; padding: 14px 16px; border: 2px solid #eee; border-radius: 12px; font-size: 0.95rem; font-family: var(--font); transition: var(--transition); outline: none; }
.form-group input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(78,205,196,0.15); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.stripe-placeholder { background: var(--gray); border: 2px dashed #ccc; border-radius: 12px; padding: 20px; text-align: center; color: var(--text-light); font-size: 0.88rem; margin-bottom: 20px; }
.stripe-placeholder strong { display: block; color: var(--dark); margin-bottom: 4px; }
.btn-pay { width: 100%; background: linear-gradient(135deg,#4ECDC4,#44b3ab); color: white; padding: 18px; border-radius: 50px; font-size: 1.1rem; font-weight: 800; transition: var(--transition); box-shadow: 0 4px 20px rgba(78,205,196,0.4); }
.btn-pay:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(78,205,196,0.5); }
.btn-pay:disabled { background: #ccc; box-shadow: none; transform: none; cursor: default; }

/* ===== サンクスページ ===== */
.thankyou-page { text-align: center; padding: 100px 40px; max-width: 600px; margin: 0 auto; }
.thankyou-icon { font-size: 5rem; margin-bottom: 24px; }
.thankyou-page h1 { font-size: 2.4rem; font-weight: 900; margin-bottom: 12px; color: var(--dark); }
.thankyou-page p { color: var(--text-light); margin-bottom: 40px; font-size: 1rem; line-height: 1.8; }
.btn-home { background: linear-gradient(135deg,var(--primary),var(--purple)); color: white; padding: 16px 40px; border-radius: 50px; font-size: 1rem; font-weight: 700; transition: var(--transition); display: inline-block; box-shadow: 0 4px 20px rgba(255,107,107,0.35); }
.btn-home:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(255,107,107,0.5); }

/* ===== フッター ===== */
.footer { background: var(--dark); color: #aaa; text-align: center; padding: 32px 40px; font-size: 0.85rem; margin-top: 80px; }

/* ===== ユーティリティ ===== */
.btn-primary { background: linear-gradient(135deg,var(--primary),var(--purple)); color: white; padding: 12px 28px; border-radius: 50px; font-weight: 700; transition: var(--transition); display: inline-block; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.loading { text-align: center; padding: 80px; color: var(--text-light); font-size: 1.1rem; }

/* ===== レスポンシブ ===== */
@media (max-width: 768px) {
  .navbar { padding: 0 20px; }
  .navbar__nav { display: none; }
  .hero { padding: 50px 20px; }
  .hero__title { font-size: 2rem; }
  .gallery-section { padding: 40px 20px; }
  .gallery-grid { grid-template-columns: repeat(auto-fill,minmax(220px,1fr)); gap: 18px; }
  .detail-grid { grid-template-columns: 1fr; gap: 32px; }
  .detail-page, .cart-page, .checkout-page { padding: 32px 20px; }
}