/* ==============================================
   ガジェットバリア 商品紹介ページ スタイルシート
   ============================================== */

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

:root {
  --blue-dark: #0d2a5c;
  --blue-mid:  #1a4db8;
  --blue-bright: #1e72f5;
  --blue-light: #e8f0fe;
  --accent: #1e72f5;
  --text-main: #1a1a2e;
  --text-sub: #4a4a6a;
  --bg-white: #ffffff;
  --bg-light: #f5f7fb;
  --bg-dark: #111827;
  --border: #dde3f0;
  --shadow: 0 8px 32px rgba(13,42,92,.12);
  --radius: 16px;
  --transition: .3s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', sans-serif;
  color: var(--text-main);
  background: var(--bg-white);
  line-height: 1.8;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
a { text-decoration: none; color: inherit; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Sections ---------- */
.section        { padding: 96px 0; background: var(--bg-white); }
.section-light  { padding: 96px 0; background: var(--bg-light); }
.section-dark   { padding: 96px 0; background: var(--bg-dark); }
.section-blue   { padding: 96px 0; background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue-mid) 100%); }

/* ---------- Section Title ---------- */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 900;
  text-align: center;
  margin-bottom: 56px;
  color: var(--blue-dark);
  letter-spacing: .02em;
}
.section-title span {
  color: var(--blue-bright);
}
.section-title.white {
  color: #fff;
}

/* ---------- Buttons ---------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--blue-bright);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  padding: 16px 36px;
  border-radius: 50px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px rgba(30,114,245,.4);
}
.btn-primary:hover {
  background: var(--blue-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(30,114,245,.5);
}

/* ---------- HEADER ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
}
.header-logo {
  height: 44px;
  width: auto;
  object-fit: contain;
}

/* ---------- HERO ---------- */
.hero {
  background: linear-gradient(135deg, var(--blue-dark) 0%, #1a3a7a 50%, #0a1f4e 100%);
  padding: 80px 0 100px;
  overflow: hidden;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-inner {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-catch {
  display: inline-block;
  background: rgba(30,114,245,.25);
  border: 1px solid rgba(30,114,245,.5);
  color: #90b8ff;
  font-size: .85rem;
  font-weight: 500;
  letter-spacing: .12em;
  padding: 6px 18px;
  border-radius: 50px;
  margin-bottom: 20px;
  text-transform: uppercase;
}
.hero-title {
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.25;
  margin-bottom: 24px;
  letter-spacing: .02em;
}
.hero-sub {
  font-size: 1.05rem;
  color: #b8cdf5;
  line-height: 1.9;
  margin-bottom: 40px;
}
.hero-image {
  position: relative;
}
.hero-image img {
  border-radius: var(--radius);
  box-shadow: 0 24px 64px rgba(0,0,0,.45);
  width: 100%;
  object-fit: cover;
  aspect-ratio: 16/10;
}

/* ---------- FEATURES ---------- */
.feature-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.feature-item {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-item:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}
.feature-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-bright), var(--blue-mid));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
}
.feature-icon i {
  font-size: 1.8rem;
  color: #fff;
}
.feature-item h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--blue-dark);
}
.feature-item p {
  font-size: .95rem;
  color: var(--text-sub);
  line-height: 1.8;
}

/* ---------- GALLERY ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: auto auto;
  gap: 16px;
}
.gallery-main {
  grid-column: 1;
  grid-row: 1 / 3;
}
.gallery-wide {
  grid-column: 2 / 5;
}
.gallery-item {
  overflow: hidden;
  border-radius: var(--radius);
  position: relative;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}
.gallery-item:hover img {
  transform: scale(1.04);
}
.gallery-main img {
  aspect-ratio: 3/4;
}
.gallery-item:not(.gallery-main):not(.gallery-wide) img {
  aspect-ratio: 16/9;
}
.gallery-wide img {
  aspect-ratio: 21/9;
}
figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 10px 16px;
  background: linear-gradient(to top, rgba(0,0,0,.7), transparent);
  color: #fff;
  font-size: .82rem;
  font-weight: 500;
}

/* ---------- HOW TO USE ---------- */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
  max-width: 760px;
  margin: 0 auto;
}
.step-item {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.step-item:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow);
}
.step-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--blue-bright);
  line-height: 1;
  min-width: 72px;
  letter-spacing: -.04em;
  opacity: .8;
}
.step-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--blue-dark);
  margin-bottom: 10px;
}
.step-content p {
  font-size: .95rem;
  color: var(--text-sub);
  line-height: 1.8;
}

/* ---------- PACKAGE CONTENTS ---------- */
.contents-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 600px;
  margin: 0 auto;
}
.contents-list li {
  display: flex;
  align-items: center;
  gap: 24px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 32px;
  box-shadow: 0 2px 12px rgba(13,42,92,.06);
}
.contents-list i {
  font-size: 1.8rem;
  color: var(--blue-bright);
  min-width: 40px;
  text-align: center;
}
.contents-list strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--blue-dark);
}
.contents-list span {
  font-size: .9rem;
  color: var(--text-sub);
}

/* ---------- CAUTIONS ---------- */
.caution-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 760px;
  margin: 0 auto;
  background: #fff8e1;
  border: 1px solid #ffe082;
  border-radius: var(--radius);
  padding: 40px 48px;
}
.caution-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: .95rem;
  color: #5d4037;
  line-height: 1.7;
}
.caution-list i {
  color: #f9a825;
  font-size: 1rem;
  margin-top: 4px;
  flex-shrink: 0;
}

/* ---------- PURCHASE ---------- */
.purchase-card {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 24px;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  max-width: 860px;
  margin: 0 auto;
  backdrop-filter: blur(8px);
}
.purchase-image {
  background: rgba(255,255,255,.05);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 32px;
}
.purchase-image img {
  max-height: 340px;
  object-fit: contain;
  filter: drop-shadow(0 12px 32px rgba(0,0,0,.35));
  border-radius: 8px;
}
.purchase-info {
  padding: 48px 48px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.product-name {
  font-size: 1.7rem;
  font-weight: 900;
  color: #fff;
  letter-spacing: .02em;
}
.product-capacity {
  font-size: .9rem;
  color: #90b8ff;
}
.price-block {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 4px 0;
}
.price {
  font-size: 2.6rem;
  font-weight: 900;
  color: #fff;
  letter-spacing: -.02em;
}
.price-tax {
  font-size: .9rem;
  color: #90b8ff;
}
.shipping-note {
  font-size: .9rem;
  color: #b8cdf5;
  display: flex;
  align-items: center;
  gap: 8px;
}
.free-shipping {
  font-size: .9rem;
  color: #7dd3a8;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(125,211,168,.1);
  border: 1px solid rgba(125,211,168,.3);
  padding: 10px 16px;
  border-radius: 8px;
}
.qty-block {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 8px;
}
.qty-block label {
  font-size: .95rem;
  font-weight: 700;
  color: #c8d8f0;
}
.qty-controls {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 8px;
  overflow: hidden;
}
.qty-btn {
  background: none;
  border: none;
  color: #fff;
  font-size: 1.3rem;
  width: 44px;
  height: 44px;
  cursor: pointer;
  transition: background var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.qty-btn:hover { background: rgba(255,255,255,.15); }
#qty {
  width: 52px;
  background: none;
  border: none;
  border-left: 1px solid rgba(255,255,255,.2);
  border-right: 1px solid rgba(255,255,255,.2);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  text-align: center;
  height: 44px;
  -moz-appearance: textfield;
}
#qty::-webkit-outer-spin-button,
#qty::-webkit-inner-spin-button { -webkit-appearance: none; }

.btn-cart {
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--blue-bright);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  padding: 18px 0;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  width: 100%;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 6px 24px rgba(30,114,245,.5);
  letter-spacing: .04em;
}
.btn-cart:hover {
  background: #1554c7;
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(30,114,245,.6);
}
.btn-cart:active { transform: scale(.98); }

/* ---------- FOOTER ---------- */
.site-footer {
  background: #0a0e1a;
  padding: 48px 24px;
  text-align: center;
}
.footer-logo {
  height: 36px;
  width: auto;
  margin: 0 auto 16px;
  object-fit: contain;
  opacity: .85;
}
.footer-copy {
  font-size: .85rem;
  color: #5a6a8a;
}

/* ---------- Toast notification ---------- */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--blue-dark);
  color: #fff;
  padding: 16px 32px;
  border-radius: 50px;
  font-size: .95rem;
  font-weight: 600;
  box-shadow: 0 8px 32px rgba(0,0,0,.35);
  opacity: 0;
  transition: transform .4s ease, opacity .4s ease;
  pointer-events: none;
  z-index: 9999;
  white-space: nowrap;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ==============================================
   RESPONSIVE
   ============================================== */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-text { order: 1; }
  .hero-image { order: 0; }
  .hero-catch { display: none; }

  .feature-list {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .gallery-grid {
    grid-template-columns: 1fr 1fr;
  }
  .gallery-main { grid-column: 1 / 3; grid-row: auto; }
  .gallery-wide { grid-column: 1 / 3; }
  .gallery-main img { aspect-ratio: 16/9; }

  .purchase-card {
    grid-template-columns: 1fr;
  }
  .purchase-image { padding: 32px; }
  .purchase-image img { max-height: 220px; }
  .purchase-info { padding: 32px 28px; }

  .caution-list { padding: 28px 24px; }
}

@media (max-width: 600px) {
  .section, .section-light, .section-dark, .section-blue {
    padding: 64px 0;
  }
  .section-title { margin-bottom: 36px; }

  .step-item { flex-direction: column; gap: 12px; padding: 24px; }
  .step-number { font-size: 2rem; min-width: unset; }

  .gallery-grid { grid-template-columns: 1fr; }
  .gallery-main { grid-column: 1; }
  .gallery-wide { grid-column: 1; }

  .price { font-size: 2rem; }
  .purchase-info { padding: 24px 20px; gap: 12px; }
}