*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --primary:   #1a3a5c;
      --accent:    #f0a500;
      --light-bg:  #f4f7fb;
      --card-bg:   #ffffff;
      --text:      #2c3e50;
      --muted:     #607080;
      --success:   #27ae60;
      --warning:   #e67e22;
      --danger:    #c0392b;
      --radius:    10px;
    }

    body {
      font-family: 'Segoe UI', Arial, sans-serif;
      color: var(--text);
      background: var(--light-bg);
      line-height: 1.7;
    }

    /* ─── HERO ─── */
    header {
      background: linear-gradient(135deg, #0d2137 0%, #1a3a5c 60%, #2c6e9b 100%);
      color: #fff;
      padding: 80px 24px 60px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    header::before {
      content: '';
      position: absolute; inset: 0;
      background: repeating-linear-gradient(
        -45deg,
        transparent, transparent 18px,
        rgba(255,255,255,.03) 18px, rgba(255,255,255,.03) 36px
      );
    }
    header .badge {
      display: inline-block;
      background: var(--accent);
      color: #1a1a1a;
      font-size: .78rem;
      font-weight: 700;
      letter-spacing: .12em;
      text-transform: uppercase;
      padding: 5px 14px;
      border-radius: 20px;
      margin-bottom: 18px;
    }
    header h1 {
      font-size: clamp(1.9rem, 4vw, 3.2rem);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 18px;
      text-shadow: 0 2px 8px rgba(0,0,0,.4);
    }
    header p.subtitle {
      max-width: 680px;
      margin: 0 auto;
      font-size: 1.1rem;
      opacity: .88;
    }

    /* ─── LAYOUT ─── */
    main { max-width: 1100px; margin: 0 auto; padding: 48px 24px 72px; }

    section { margin-bottom: 60px; }
    h2 {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
      border-left: 5px solid var(--accent);
      padding-left: 14px;
      margin-bottom: 22px;
    }
    h3 { font-size: 1.1rem; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
    p  { margin-bottom: 14px; color: var(--text); }

    /* ─── STAT STRIP ─── */
    .stat-strip {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 16px;
      background: var(--primary);
      border-radius: var(--radius);
      padding: 28px 24px;
      margin-bottom: 60px;
    }
    .stat-item { text-align: center; color: #fff; }
    .stat-item .number {
      display: block;
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--accent);
    }
    .stat-item .label { font-size: .85rem; opacity: .85; }

    /* ─── CARDS ─── */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
      gap: 20px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 24px 22px;
      box-shadow: 0 2px 12px rgba(0,0,0,.07);
      border-top: 4px solid var(--primary);
      transition: transform .2s, box-shadow .2s;
    }
    .card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,.12); }
    .card .icon { font-size: 2rem; margin-bottom: 12px; }
    .card.accent-border { border-top-color: var(--accent); }
    .card.green-border  { border-top-color: var(--success); }
    .card.orange-border { border-top-color: var(--warning); }
    .card.red-border    { border-top-color: var(--danger); }

    /* ─── PRO/CON TABLE ─── */
    .pro-con {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    @media(max-width:620px){ .pro-con { grid-template-columns: 1fr; } }
    .pro-box, .con-box {
      border-radius: var(--radius);
      padding: 22px;
    }
    .pro-box { background: #eafaf1; border: 1px solid #a9dfbf; }
    .con-box { background: #fef9e7; border: 1px solid #f9ca74; }
    .pro-box h3 { color: var(--success); }
    .con-box h3 { color: var(--warning); }
    .pro-box ul, .con-box ul { padding-left: 20px; }
    .pro-box li, .con-box li { margin-bottom: 8px; font-size: .95rem; }

    /* ─── COMPARISON TABLE ─── */
    .table-wrap { overflow-x: auto; }
    table {
      width: 100%;
      border-collapse: collapse;
      font-size: .92rem;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(0,0,0,.07);
    }
    thead tr { background: var(--primary); color: #fff; }
    th, td { padding: 13px 16px; text-align: left; border-bottom: 1px solid #e0e7ef; }
    tbody tr:nth-child(even) { background: #f0f4f9; }
    tbody tr:hover { background: #dde8f5; }
    .check  { color: var(--success); font-weight: 700; }
    .cross  { color: var(--danger);  font-weight: 700; }
    .partial{ color: var(--warning); font-weight: 700; }

    /* ─── TIMELINE ─── */
    .timeline { position: relative; padding-left: 36px; }
    .timeline::before {
      content: '';
      position: absolute; left: 10px; top: 0; bottom: 0;
      width: 3px; background: linear-gradient(to bottom, var(--primary), var(--accent));
      border-radius: 3px;
    }
    .tl-item { position: relative; margin-bottom: 28px; }
    .tl-item::before {
      content: '';
      position: absolute; left: -30px; top: 6px;
      width: 14px; height: 14px;
      background: var(--accent);
      border: 3px solid var(--primary);
      border-radius: 50%;
    }
    .tl-item .year {
      display: inline-block;
      background: var(--primary);
      color: #fff;
      font-size: .78rem;
      font-weight: 700;
      padding: 2px 10px;
      border-radius: 20px;
      margin-bottom: 6px;
    }

    /* ─── CALLOUT ─── */
    .callout {
      display: flex;
      gap: 16px;
      align-items: flex-start;
      background: #eaf3fb;
      border-left: 5px solid var(--primary);
      border-radius: var(--radius);
      padding: 18px 20px;
      margin: 24px 0;
    }
    .callout .icon { font-size: 1.6rem; flex-shrink: 0; }

    /* ─── DEPTH DIAGRAM ─── */
    .depth-diagram {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: 0 2px 12px rgba(0,0,0,.07);
    }
    .ground-surface {
      background: repeating-linear-gradient(90deg, #8B6914 0px, #8B6914 6px, #a07828 6px, #a07828 12px);
      height: 20px; border-radius: 4px 4px 0 0;
      display: flex; align-items: center; padding: 0 10px;
      color: #fff; font-size: .75rem; font-weight: 700;
    }
    .soil-layer {
      background: linear-gradient(to bottom, #c8a96a, #a07030);
      padding: 12px 16px;
      font-size: .82rem; color: #fff;
      display: flex; justify-content: space-between; align-items: center;
    }
    .cable-row {
      display: flex; align-items: center; gap: 14px;
      background: #7a5020; padding: 10px 16px; margin: 4px 0;
    }
    .cable-icon { width: 50px; height: 16px; border-radius: 8px; flex-shrink: 0; }
    .cable-label { color: #fff; font-size: .82rem; }
    .cable-label strong { color: var(--accent); }
    .deeper-soil {
      background: linear-gradient(to bottom, #6b4418, #3d2006);
      height: 28px; border-radius: 0 0 4px 4px;
    }

    /* ─── FOOTER ─── */
    footer {
      background: var(--primary);
      color: rgba(255,255,255,.7);
      text-align: center;
      padding: 28px 24px;
      font-size: .85rem;
    }
    footer strong { color: #fff; }

    /* ─── RESPONSIVE ─── */
    @media(max-width:768px){
      .card-grid { grid-template-columns: 1fr; }
      header { padding: 50px 16px 40px; }
    }