* { box-sizing: border-box; margin: 0; padding: 0; }
  body { font-family: 'Noto Sans JP', sans-serif; background: #f5f5f5; color: #333; font-size: 14px; }

  /* ===== Page Header ===== */
  .page-header {
    background: #0a0f1a; color: #fff; padding: 56px 40px 48px; text-align: center;
  }
  .page-header-eyebrow {
    font-family: 'Inter', sans-serif; font-size: 11px; letter-spacing: 6px;
    color: #2c5f8a; margin-bottom: 16px; font-weight: 600;
  }
  .page-header h1 {
    font-family: 'Noto Serif JP', serif; font-size: 28px; font-weight: 400;
    margin-bottom: 12px; letter-spacing: 2px;
  }
  .page-header p { font-size: 13px; color: rgba(255,255,255,0.5); line-height: 1.8; }
  .page-header .stats {
    display: flex; justify-content: center; gap: 32px; margin-top: 24px;
    font-family: 'Inter', sans-serif;
  }
  .page-header .stat-item { text-align: center; }
  .page-header .stat-num { font-size: 28px; font-weight: 700; color: #3a7ab5; }
  .page-header .stat-label { font-size: 10px; color: rgba(255,255,255,0.4); letter-spacing: 1px; margin-top: 4px; }

  /* ===== Section ===== */
  .section {
    max-width: 1200px; margin: 0 auto; padding: 56px 40px;
  }
  .section-title {
    font-size: 18px; font-weight: 700; margin-bottom: 8px;
    display: flex; align-items: center; gap: 12px;
  }
  .section-title .badge {
    font-family: 'Inter', sans-serif; font-size: 10px; font-weight: 600;
    background: #1e3a5f; color: #fff; padding: 3px 10px; border-radius: 2px;
    letter-spacing: 1px;
  }
  .section-desc { font-size: 13px; color: #555; margin-bottom: 32px; }

  /* ===== PC Layout Mockup ===== */
  .layout-mockup {
    display: grid; grid-template-columns: 1fr 300px; gap: 0;
    background: #fff; border: 2px solid #ddd; border-radius: 8px; overflow: hidden;
    max-width: 1000px; margin: 0 auto;
  }

  .mock-header {
    grid-column: 1 / -1; background: #1a1a1a; color: #fff;
    padding: 14px 24px; display: flex; align-items: center; justify-content: space-between;
    font-size: 12px;
  }
  .mock-header .mock-logo { font-weight: 700; font-size: 16px; letter-spacing: 2px; }
  .mock-header .mock-nav { display: flex; gap: 16px; font-size: 11px; color: #555; }

  .mock-banner-full {
    grid-column: 1 / -1;
  }

  .ad-slot {
    border: 2px dashed; padding: 20px; text-align: center;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    position: relative; min-height: 90px;
    transition: transform 0.2s, box-shadow 0.2s;
  }
  .ad-slot:hover {
    transform: scale(1.02); box-shadow: 0 4px 20px rgba(0,0,0,0.1); z-index: 2;
  }

  .ad-slot-premium {
    border-color: #e74c3c; background: rgba(231,76,60,0.06);
    min-height: 100px;
  }
  .ad-slot-sidebar-top {
    border-color: #3498db; background: rgba(52,152,219,0.06);
    min-height: 250px;
  }
  .ad-slot-sidebar-bottom {
    border-color: #2ecc71; background: rgba(46,204,113,0.06);
    min-height: 250px;
  }
  .ad-slot-article {
    border-color: #f39c12; background: rgba(243,156,18,0.06);
    min-height: 100px;
  }
  .ad-slot-footer {
    border-color: #9b59b6; background: rgba(155,89,182,0.06);
    min-height: 90px;
  }

  .ad-slot .slot-number {
    position: absolute; top: 8px; left: 8px;
    width: 22px; height: 22px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-family: 'Inter', sans-serif; font-size: 11px; font-weight: 700; color: #fff;
  }
  .ad-slot-premium .slot-number { background: #e74c3c; }
  .ad-slot-sidebar-top .slot-number { background: #3498db; }
  .ad-slot-sidebar-bottom .slot-number { background: #2ecc71; }
  .ad-slot-article .slot-number { background: #f39c12; }
  .ad-slot-footer .slot-number { background: #9b59b6; }

  .ad-slot .slot-name {
    font-size: 13px; font-weight: 700; margin-bottom: 4px;
  }
  .ad-slot-premium .slot-name { color: #e74c3c; }
  .ad-slot-sidebar-top .slot-name { color: #3498db; }
  .ad-slot-sidebar-bottom .slot-name { color: #2ecc71; }
  .ad-slot-article .slot-name { color: #f39c12; }
  .ad-slot-footer .slot-name { color: #9b59b6; }

  .ad-slot .slot-price {
    font-family: 'Inter', sans-serif; font-size: 18px; font-weight: 700; margin-bottom: 2px;
  }
  .ad-slot .slot-detail {
    font-size: 11px; color: #666;
  }
  .ad-slot .slot-imp {
    font-family: 'Inter', sans-serif; font-size: 11px; color: #666;
    background: rgba(0,0,0,0.04); padding: 3px 10px; border-radius: 10px; margin-top: 6px;
  }

  /* Mock content areas */
  .mock-content {
    padding: 0;
  }
  .mock-content-block {
    padding: 24px;
  }
  .mock-text-line {
    height: 10px; background: #eee; border-radius: 2px; margin-bottom: 8px;
  }
  .mock-text-line:nth-child(odd) { width: 100%; }
  .mock-text-line:nth-child(even) { width: 85%; }
  .mock-text-line.short { width: 60%; }
  .mock-text-heading {
    height: 16px; background: #ddd; border-radius: 2px; margin-bottom: 16px; width: 70%;
  }
  .mock-img {
    height: 200px; background: #e8e8e8; border-radius: 4px; margin-bottom: 16px;
    display: flex; align-items: center; justify-content: center;
    font-size: 11px; color: #888;
  }

  .mock-sidebar {
    border-left: 1px solid #eee; padding: 0;
  }
  .mock-sidebar-block {
    padding: 16px;
  }
  .mock-sidebar .mock-widget {
    background: #f5f5f5; border-radius: 4px; padding: 16px; margin-bottom: 12px;
  }
  .mock-sidebar .mock-widget-title {
    height: 12px; background: #ddd; width: 60%; border-radius: 2px; margin-bottom: 12px;
  }
  .mock-sidebar .mock-widget-item {
    height: 8px; background: #e8e8e8; border-radius: 2px; margin-bottom: 6px;
  }

  .mock-footer-area {
    grid-column: 1 / -1; background: #f0f0f0; border-top: 1px solid #ddd;
  }

  /* Divider in content */
  .mock-divider {
    height: 1px; background: #eee; margin: 0;
  }

  /* ===== SP Layout Mockup ===== */
  .sp-mockup-wrap {
    display: flex; justify-content: center; gap: 48px; flex-wrap: wrap;
  }
  .sp-mockup {
    width: 375px; background: #fff; border: 2px solid #ddd; border-radius: 24px;
    overflow: hidden; box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  }
  .sp-mock-header {
    background: #1a1a1a; color: #fff; padding: 12px 16px;
    display: flex; align-items: center; justify-content: space-between;
    font-size: 11px;
  }
  .sp-mock-header .mock-logo { font-size: 14px; font-weight: 700; letter-spacing: 1px; }

  .sp-ad-slot {
    border: 2px dashed; padding: 16px; text-align: center;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    position: relative; margin: 0;
  }

  .sp-ad-slot-header {
    border-color: #e74c3c; background: rgba(231,76,60,0.06);
    min-height: 60px;
  }
  .sp-ad-slot-article {
    border-color: #f39c12; background: rgba(243,156,18,0.06);
    min-height: 160px;
  }
  .sp-ad-slot-bottom {
    border-color: #2ecc71; background: rgba(46,204,113,0.06);
    min-height: 160px;
  }

  .sp-ad-slot .slot-number {
    position: absolute; top: 6px; left: 6px;
    width: 20px; height: 20px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-family: 'Inter', sans-serif; font-size: 10px; font-weight: 700; color: #fff;
  }
  .sp-ad-slot-header .slot-number { background: #e74c3c; }
  .sp-ad-slot-article .slot-number { background: #f39c12; }
  .sp-ad-slot-bottom .slot-number { background: #2ecc71; }

  .sp-ad-slot .slot-name { font-size: 12px; font-weight: 700; margin-bottom: 2px; }
  .sp-ad-slot-header .slot-name { color: #e74c3c; }
  .sp-ad-slot-article .slot-name { color: #f39c12; }
  .sp-ad-slot-bottom .slot-name { color: #2ecc71; }
  .sp-ad-slot .slot-price { font-family: 'Inter', sans-serif; font-size: 16px; font-weight: 700; }
  .sp-ad-slot .slot-detail { font-size: 10px; color: #666; }
  .sp-ad-slot .slot-imp {
    font-family: 'Inter', sans-serif; font-size: 10px; color: #666;
    background: rgba(0,0,0,0.04); padding: 2px 8px; border-radius: 10px; margin-top: 4px;
  }

  .sp-mock-content { padding: 16px; }
  .sp-mock-footer { background: #f0f0f0; padding: 16px; text-align: center; font-size: 10px; color: #555; }

  /* ===== Price Table ===== */
  .price-table-wrap {
    display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
    max-width: 1000px; margin: 0 auto;
  }
  .price-table {
    background: #fff; border-radius: 8px; overflow: hidden;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  }
  .price-table-header {
    padding: 20px 24px; color: #fff; font-size: 15px; font-weight: 700;
    display: flex; align-items: center; gap: 10px;
  }
  .price-table-header .icon { font-size: 20px; }
  .price-table-pc .price-table-header { background: #1e3a5f; }
  .price-table-sp .price-table-header { background: #2c5f8a; }

  .price-row {
    display: grid; grid-template-columns: 20px 1fr auto auto;
    gap: 12px; align-items: center;
    padding: 14px 24px; border-bottom: 1px solid #f0f0f0;
    font-size: 13px;
  }
  .price-row:last-child { border-bottom: none; }
  .price-row:hover { background: #fafafa; }

  .price-dot {
    width: 10px; height: 10px; border-radius: 50%;
  }
  .price-name { font-weight: 400; }
  .price-val {
    font-family: 'Inter', sans-serif; font-weight: 700; font-size: 15px;
    text-align: right;
  }
  .price-imp {
    font-family: 'Inter', sans-serif; font-size: 11px; color: #666;
    text-align: right; min-width: 80px;
  }

  /* ===== Summary Cards ===== */
  .summary-cards {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
    max-width: 1000px; margin: 0 auto;
  }
  .summary-card {
    background: #fff; border-radius: 8px; padding: 28px 24px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06); text-align: center;
  }
  .summary-card .card-label {
    font-size: 11px; color: #666; letter-spacing: 1px;
    font-family: 'Inter', sans-serif; margin-bottom: 8px;
  }
  .summary-card .card-value {
    font-family: 'Inter', sans-serif; font-size: 32px; font-weight: 700;
    color: #1e3a5f; margin-bottom: 4px;
  }
  .summary-card .card-unit { font-size: 12px; color: #555; }

  /* ===== Note ===== */
  .note-box {
    max-width: 1000px; margin: 32px auto 0;
    background: #fff; border-left: 4px solid #2c5f8a;
    padding: 20px 24px; border-radius: 0 8px 8px 0;
    font-size: 12px; color: #666; line-height: 2.0;
  }
  .note-box strong { color: #1e3a5f; }

  /* ===== Back Link ===== */
  .back-link {
    text-align: center; padding: 48px 20px;
  }
  .back-link a {
    display: inline-block; padding: 12px 32px;
    background: #1e3a5f; color: #fff; text-decoration: none;
    font-size: 13px; border-radius: 4px;
    transition: background 0.2s;
  }
  .back-link a:hover { background: #2c5f8a; }

  /* ===== Responsive ===== */
  @media (max-width: 768px) {
    .section { padding: 40px 16px; }
    .layout-mockup { grid-template-columns: 1fr; }
    .mock-sidebar { border-left: none; border-top: 1px solid #eee; }
    .price-table-wrap { grid-template-columns: 1fr; }
    .summary-cards { grid-template-columns: 1fr; }
    .sp-mockup-wrap { gap: 24px; }
    .page-header .stats { flex-direction: column; gap: 16px; }
  }

  /* Footer SNS */
  .footer-sns {
    padding: 24px 40px;
    display: flex; flex-wrap: wrap;
    gap: 10px 24px;
    border-bottom: 1px solid rgba(255,255,255,.1);
  }
  .footer-sns a, .footer-sns a:link, .footer-sns a:visited {
    display: inline-flex; align-items: center; gap: 6px;
    color: rgba(255,255,255,.6); text-decoration: none;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 12px; font-weight: 600;
    transition: color 0.2s; line-height: 1;
  }
  .footer-sns a svg { flex-shrink: 0; vertical-align: middle; }
  .footer-sns a:hover { color: #fff; }
  .footer-sns a::after { display: none !important; }