:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-primary: #1f2937;
  --color-primary-light: #374151;
  --color-accent: #ff9900;
  --color-accent-dark: #e07b00;
  --color-text: #232323;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
  --max-width: 1120px;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.nav-links {
  display: flex;
  gap: 24px;
  font-size: 0.9rem;
  font-weight: 600;
}

.nav-links a {
  opacity: 0.85;
  transition: opacity 0.2s;
}

.nav-links a:hover { opacity: 1; color: var(--color-accent); }

.breadcrumb {
  font-size: 0.82rem;
  color: var(--color-muted);
  margin: 20px 0;
}

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

/* Hero */
.hero {
  background: linear-gradient(135deg, #1f2937 0%, #2f3b4c 60%, #3a2e1a 130%);
  color: #fff;
  padding: 64px 0 56px;
}

.hero-inner { text-align: center; max-width: 720px; margin: 0 auto; }

.hero h1 {
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  margin: 0 0 14px;
  font-weight: 800;
  line-height: 1.4;
}

.hero p {
  color: #d1d5db;
  font-size: 1rem;
  margin: 0 0 28px;
}

.hero-badges {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.badge {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  color: #e5e7eb;
}

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn-accent {
  background: var(--color-accent);
  color: #1a1a1a;
}

.btn-accent:hover { background: var(--color-accent-dark); transform: translateY(-2px); box-shadow: var(--shadow-hover); }

.btn-outline {
  background: transparent;
  border: 1px solid #9ca3af;
  color: #fff;
}

.btn-outline:hover { border-color: #fff; }

/* Section titles */
.section { padding: 56px 0; }
.section-alt { background: var(--color-surface); }

.section-head {
  text-align: center;
  margin-bottom: 36px;
}

.section-head .eyebrow {
  color: var(--color-accent-dark);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-head h2 {
  font-size: 1.6rem;
  margin: 8px 0 10px;
  font-weight: 800;
}

.section-head p { color: var(--color-muted); font-size: 0.92rem; }

/* Category chips */
.categories {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 8px;
}

.category-chip {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: border-color 0.2s, color 0.2s;
}

.category-chip:hover { border-color: var(--color-accent); color: var(--color-accent-dark); }

/* Product grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }

.product-thumb {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.4rem;
  position: relative;
}

.product-card .rank {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
}

.product-body { padding: 18px 20px 22px; display: flex; flex-direction: column; flex: 1; }

.product-cat {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.product-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin: 0 0 8px;
  line-height: 1.4;
}

.product-desc {
  font-size: 0.86rem;
  color: var(--color-muted);
  margin: 0 0 14px;
  flex: 1;
}

.rating {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--color-muted);
  margin-bottom: 14px;
}

.stars { color: var(--color-accent); letter-spacing: 1px; }

.price-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 14px;
}

.price { font-size: 1.05rem; font-weight: 800; color: var(--color-primary); }
.price small { font-weight: 500; font-size: 0.72rem; color: var(--color-muted); }

.product-actions { display: flex; gap: 8px; }

.btn-small {
  flex: 1;
  text-align: center;
  padding: 10px 14px;
  font-size: 0.85rem;
  border-radius: 8px;
}

.btn-primary-outline {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  font-weight: 700;
}

.btn-primary-outline:hover { border-color: var(--color-primary); }

/* Product detail page */
.product-hero {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 40px;
  align-items: start;
}

@media (max-width: 720px) {
  .product-hero { grid-template-columns: 1fr; }
}

.product-hero-thumb {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
  box-shadow: var(--shadow);
}

.product-hero-info h1 {
  font-size: 1.6rem;
  margin: 6px 0 12px;
  font-weight: 800;
}

.tag-row { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }

.tag {
  font-size: 0.74rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  background: #fff3e0;
  color: var(--color-accent-dark);
}

.tag.alt { background: #e8f0fe; color: #1e40af; }

.summary { color: var(--color-muted); font-size: 0.95rem; margin-bottom: 20px; }

.buy-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow);
}

.buy-box .price-main { font-size: 1.6rem; font-weight: 800; color: var(--color-primary); }
.buy-box .price-note { font-size: 0.76rem; color: var(--color-muted); margin: 4px 0 16px; }

.cta-amazon {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  background: var(--color-accent);
  color: #1a1a1a;
  padding: 14px 20px;
  border-radius: 10px;
  font-weight: 800;
  font-size: 1rem;
  margin-bottom: 8px;
  transition: background 0.15s, transform 0.15s;
}

.cta-amazon:hover { background: var(--color-accent-dark); transform: translateY(-1px); }
.cta-note { font-size: 0.72rem; color: var(--color-muted); text-align: center; }

.content-block { margin: 40px 0; }
.content-block h2 {
  font-size: 1.25rem;
  font-weight: 800;
  margin: 0 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
}

.feature-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.feature-list li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.92rem;
  display: flex;
  gap: 10px;
}
.feature-list li::before { content: "\2713"; color: var(--color-accent-dark); font-weight: 800; }

.spec-table { width: 100%; border-collapse: collapse; background: var(--color-surface); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.spec-table th, .spec-table td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.88rem;
}
.spec-table th { width: 30%; color: var(--color-muted); font-weight: 700; background: #fafafa; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: none; }

.pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 640px) { .pros-cons { grid-template-columns: 1fr; } }

.pc-card { border-radius: var(--radius); padding: 18px 20px; }
.pc-card.pros { background: #ecfdf5; border: 1px solid #a7f3d0; }
.pc-card.cons { background: #fef2f2; border: 1px solid #fecaca; }
.pc-card h3 { margin: 0 0 10px; font-size: 0.95rem; }
.pc-card ul { margin: 0; padding-left: 18px; font-size: 0.87rem; }
.pc-card li { margin-bottom: 6px; }

.related-title { font-size: 1.1rem; font-weight: 800; margin-bottom: 18px; }

/* Footer */
.site-footer {
  background: var(--color-primary);
  color: #cbd5e1;
  padding: 40px 0 24px;
  margin-top: 40px;
  font-size: 0.82rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 20px;
}

.footer-logo { font-weight: 800; color: #fff; font-size: 1.05rem; margin-bottom: 8px; }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a:hover { color: var(--color-accent); }

.disclosure {
  color: #9ca3af;
  font-size: 0.76rem;
  line-height: 1.8;
  max-width: 760px;
}

.copyright { margin-top: 16px; color: #6b7280; font-size: 0.76rem; }