.cfg *, .cfg *::before, .cfg *::after { box-sizing: border-box; margin: 0; padding: 0; }
  :root {
    --red: #C8102E; --red-dk: #a00e24;
    --blk: #111; --off-blk: #1a1a1a;
    --gray: #555; --gray-lt: #f5f4f3; --wht: #fff; --bdr: #e2e0de;
  }
  html { scroll-behavior: smooth; }
  .cfg { font-family: 'Source Sans 3', sans-serif; color: var(--blk); background: var(--gray-lt); }

  /* NAV */
  .cfg-nav { position:sticky;top:0;z-index:100;background:var(--wht);border-bottom:3px solid var(--red);display:flex;align-items:center;justify-content:space-between;padding:0 40px;height:68px;box-shadow:0 2px 12px rgba(0,0,0,0.1); }
  .cfg-nav-logo { font-family:'Oswald';font-size:20px;font-weight:700;text-transform:uppercase;text-decoration:none;color:var(--blk); }
  .cfg-nav-logo em { color:var(--red);font-style:normal; }
  .cfg-nav-phone { font-family:'Oswald';font-size:15px;font-weight:600;color:var(--blk);text-decoration:none; }
  .cfg-nav-phone span { color:var(--red); }

  /* HERO */
  .cfg-hero { background:var(--blk);color:var(--wht);padding:28px 40px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap; }
  .cfg-hero h1 { font-family:'Oswald';font-size:28px;font-weight:700;text-transform:uppercase; }
  .cfg-hero h1 em { color:var(--red);font-style:normal; }
  .cfg-hero p { font-size:14px;color:rgba(255,255,255,0.5);margin-top:4px; }
  .cfg-hero-badge { background:var(--red);font-family:'Oswald';font-size:12px;letter-spacing:0.1em;text-transform:uppercase;padding:8px 18px;white-space:nowrap; }

  /* PROGRESS */
  .cfg-progress { background:var(--wht);border-bottom:1px solid var(--bdr);padding:0 40px;display:flex;overflow-x:auto; }
  .cfg-ps { display:flex;align-items:center;gap:8px;padding:14px 16px;white-space:nowrap;cursor:pointer;border-bottom:3px solid transparent;transition:all 0.2s;flex-shrink:0; }
  .cfg-ps.active { border-bottom-color:var(--red); }
  .cfg-ps.done { border-bottom-color:var(--blk); }
  .cfg-ps.locked { opacity:0.35;cursor:not-allowed; }
  .cfg-ps-num { width:24px;height:24px;border-radius:50%;border:2px solid var(--bdr);font-family:'Oswald';font-size:12px;font-weight:600;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all 0.2s; }
  .cfg-ps.active .cfg-ps-num { background:var(--red);border-color:var(--red);color:var(--wht); }
  .cfg-ps.done .cfg-ps-num { background:var(--blk);border-color:var(--blk);color:var(--wht); }
  .cfg-ps.done .cfg-ps-num .n { display:none; }
  .cfg-ps.done .cfg-ps-num::after { content:'✓';font-size:11px; }
  .cfg-ps-label { font-family:'Oswald';font-size:12px;letter-spacing:0.06em;text-transform:uppercase; }
  .cfg-ps.active .cfg-ps-label { color:var(--red);font-weight:600; }
  .cfg-ps.locked .cfg-ps-label { color:var(--gray); }

  /* LAYOUT */
  .cfg-layout { display:grid;grid-template-columns:1fr 340px;max-width:1360px;margin:0 auto;min-height:calc(100vh - 200px); }
  .cfg-left { padding:36px 40px; }
  .cfg-step { display:none; }
  .cfg-step.active { display:block; }
  .cfg-step-title { font-family:'Oswald';font-size:26px;font-weight:700;text-transform:uppercase;margin-bottom:6px; }
  .cfg-step-sub { font-size:14px;color:var(--gray);margin-bottom:28px;line-height:1.5; }

  /* BRAND CARDS */
  .brand-grid { display:grid;grid-template-columns:repeat(3,1fr);gap:16px; }
  .brand-card { border:2px solid var(--bdr);background:var(--wht);cursor:pointer;padding:32px 20px;text-align:center;transition:all 0.2s;position:relative; }
  .brand-card:hover { border-color:#999;box-shadow:0 4px 20px rgba(0,0,0,0.06); }
  .brand-card.selected { border-color:var(--red);box-shadow:0 4px 20px rgba(200,16,46,0.12); }
  .brand-card.selected::after { content:'✓';position:absolute;top:10px;right:10px;width:22px;height:22px;background:var(--red);border-radius:50%;color:var(--wht);font-size:12px;display:flex;align-items:center;justify-content:center; }
  .brand-name { font-family:'Oswald';font-size:22px;font-weight:700;text-transform:uppercase;margin-bottom:6px; }
  .brand-tag { font-size:12px;color:var(--gray);line-height:1.4; }
  .brand-from { font-family:'Oswald';font-size:14px;color:var(--red);margin-top:12px;font-weight:600; }

  /* VIEW STYLE CARDS */
  .view-grid { display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px; }
  .view-card { border:2px solid var(--bdr);background:var(--wht);cursor:pointer;padding:28px 24px;text-align:center;transition:all 0.2s;position:relative; }
  .view-card:hover { border-color:#999;box-shadow:0 4px 20px rgba(0,0,0,0.06); }
  .view-card.selected { border-color:var(--red);box-shadow:0 4px 20px rgba(200,16,46,0.12); }
  .view-card.selected::after { content:'✓';position:absolute;top:10px;right:10px;width:22px;height:22px;background:var(--red);border-radius:50%;color:var(--wht);font-size:12px;display:flex;align-items:center;justify-content:center; }
  .view-card svg { display:block;margin:0 auto 14px; }
  .view-card-name { font-family:'Oswald';font-size:18px;font-weight:700;text-transform:uppercase;margin-bottom:4px; }
  .view-card-desc { font-size:12px;color:var(--gray);line-height:1.5; }

  /* COMPARISON TABLE */
  .cmp-wrap { margin-top:24px;overflow-x:auto;border:1px solid var(--bdr);background:var(--wht); }
  .cmp-header,.cmp-row,.cmp-sel-row { display:grid;gap:0; }
  .cols-3 { grid-template-columns:170px repeat(3,1fr); }
  .cols-2 { grid-template-columns:170px repeat(2,1fr); }
  .cmp-hcell { padding:16px 12px;text-align:center;border-bottom:3px solid var(--red); }
  .cmp-hcell:first-child { border-bottom-color:var(--bdr);background:var(--gray-lt); }
  .cmp-hlabel { font-family:'Oswald';font-size:10px;letter-spacing:0.12em;text-transform:uppercase;color:var(--gray);margin-bottom:2px; }
  .cmp-hname { font-family:'Oswald';font-size:16px;font-weight:700;text-transform:uppercase; }
  .cmp-hprice { font-size:13px;color:var(--red);font-weight:600;font-family:'Oswald'; }
  .cmp-hbadge { display:inline-block;background:var(--blk);color:var(--wht);font-family:'Oswald';font-size:9px;letter-spacing:0.1em;text-transform:uppercase;padding:2px 8px;margin-bottom:4px; }
  .cmp-hbadge.pop { background:var(--red); }
  .cmp-row { border-bottom:1px solid var(--bdr); }
  .cmp-row:last-child { border-bottom:none; }
  .cmp-cell { padding:12px;font-size:13px;text-align:center;display:flex;align-items:center;justify-content:center;border-left:1px solid var(--bdr);flex-direction:column;gap:4px; }
  .cmp-cell:first-child { text-align:left;justify-content:flex-start;align-items:flex-start;background:var(--gray-lt);font-family:'Oswald';font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:0.08em;color:var(--gray);border-left:none;flex-direction:row; }
  .cmp-yes { color:var(--red);font-weight:700; }
  .cmp-no { color:#ccc; }

  /* Ventilation icons inside table */
  .vent-icon { display:flex;flex-direction:column;align-items:center;gap:4px; }
  .vent-icon svg { width:40px;height:56px; }
  .vent-icon span { font-size:11px;color:var(--gray);line-height:1.3;text-align:center; }

  /* Select row */
  .cmp-sel-row { border-top:2px solid var(--blk); }
  .cmp-sel-cell { padding:14px 12px;text-align:center;border-left:1px solid var(--bdr); }
  .cmp-sel-cell:first-child { background:var(--gray-lt);border-left:none;display:flex;align-items:center;font-family:'Oswald';font-size:11px;text-transform:uppercase;letter-spacing:0.08em;color:var(--gray); }
  .cmp-sel-cell button { width:100%;padding:12px;background:var(--blk);color:var(--wht);border:2px solid var(--blk);font-family:'Oswald';font-size:13px;font-weight:600;letter-spacing:0.08em;text-transform:uppercase;cursor:pointer;transition:all 0.2s; }
  .cmp-sel-cell button:hover { background:var(--red);border-color:var(--red); }
  .cmp-sel-cell button.chosen { background:var(--red);border-color:var(--red); }

  /* COLOR SWATCHES */
  .opt-grid { display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px; }
  .opt-card { border:2px solid var(--bdr);background:var(--wht);cursor:pointer;padding:16px;display:flex;flex-direction:column;align-items:center;gap:8px;transition:border-color 0.2s;text-align:center;position:relative; }
  .opt-card:hover { border-color:#999; }
  .opt-card.selected { border-color:var(--red); }
  .opt-card.selected::after { content:'✓';position:absolute;top:8px;right:8px;width:20px;height:20px;background:var(--red);border-radius:50%;color:var(--wht);font-size:11px;display:flex;align-items:center;justify-content:center; }
  .opt-swatch { width:52px;height:52px;border-radius:4px;border:1px solid rgba(0,0,0,0.1); }
  .opt-icon { width:48px;height:48px;display:flex;align-items:center;justify-content:center;font-size:26px; }
  .opt-name { font-family:'Oswald';font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:0.04em; }
  .opt-delta { font-family:'Oswald';font-size:12px;color:var(--red);font-weight:600; }

  /* SUMMARY + FORM */
  .sum-grid { display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:28px; }
  .sum-item { background:var(--wht);border:1px solid var(--bdr);padding:14px 18px; }
  .sum-item-label { font-family:'Oswald';font-size:10px;letter-spacing:0.14em;text-transform:uppercase;color:var(--gray);margin-bottom:4px; }
  .sum-item-value { font-family:'Oswald';font-size:16px;font-weight:600; }
  .lead-form { background:var(--wht);border:1px solid var(--bdr);padding:28px; }
  .lead-form h3 { font-family:'Oswald';font-size:20px;font-weight:700;text-transform:uppercase;margin-bottom:4px; }
  .lead-form p { font-size:13px;color:var(--gray);margin-bottom:20px;line-height:1.5; }
  .form-row { display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px; }
  .form-row.single { grid-template-columns:1fr; }
  .form-group { display:flex;flex-direction:column;gap:5px; }
  .form-group label { font-family:'Oswald';font-size:11px;letter-spacing:0.1em;text-transform:uppercase;font-weight:500; }
  .form-group input,.form-group textarea { border:1px solid var(--bdr);padding:10px 12px;font-family:'Source Sans 3';font-size:14px;outline:none;transition:border-color 0.2s; }
  .form-group input:focus,.form-group textarea:focus { border-color:var(--red); }
  .form-group textarea { resize:vertical;min-height:70px; }
  .form-submit { width:100%;background:var(--red);color:var(--wht);font-family:'Oswald';font-size:15px;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;padding:14px;border:none;cursor:pointer;transition:background 0.2s;margin-top:6px; }
  .form-submit:hover { background:var(--red-dk); }
  .form-note { font-size:11px;color:var(--gray);text-align:center;margin-top:10px;line-height:1.5; }

  /* NAV BUTTONS */
  .step-nav { display:flex;justify-content:space-between;align-items:center;margin-top:36px;padding-top:28px;border-top:1px solid var(--bdr); }
  .btn-back { background:none;border:2px solid var(--bdr);color:var(--gray);font-family:'Oswald';font-size:12px;letter-spacing:0.1em;text-transform:uppercase;padding:11px 22px;cursor:pointer;transition:all 0.2s; }
  .btn-back:hover { border-color:var(--blk);color:var(--blk); }
  .btn-next { background:var(--blk);color:var(--wht);border:2px solid var(--blk);font-family:'Oswald';font-size:13px;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;padding:12px 28px;cursor:pointer;transition:all 0.2s; }
  .btn-next:hover { background:var(--red);border-color:var(--red); }
  .btn-next:disabled { background:#ccc;border-color:#ccc;cursor:not-allowed; }
  .btn-next::after { content:' →'; }

  /* SIDEBAR */
  .cfg-right { background:var(--wht);border-left:1px solid var(--bdr);position:sticky;top:68px;height:calc(100vh - 68px);overflow-y:auto;display:flex;flex-direction:column; }
  .sb-door { background:var(--blk);padding:28px 20px;display:flex;flex-direction:column;align-items:center;gap:12px;flex-shrink:0; }
  .sb-door svg { width:120px;height:165px; }
  .sb-door-label { font-family:'Oswald';font-size:11px;letter-spacing:0.14em;text-transform:uppercase;color:rgba(255,255,255,0.4);text-align:center; }
  .sb-door-name { font-family:'Oswald';font-size:16px;font-weight:700;text-transform:uppercase;color:var(--wht);text-align:center; }
  .sb-details { padding:20px;flex:1; }
  .sb-section-label { font-family:'Oswald';font-size:10px;letter-spacing:0.14em;text-transform:uppercase;color:var(--gray);margin-bottom:8px; }
  .sb-row { display:flex;justify-content:space-between;align-items:center;padding:7px 0;border-bottom:1px solid var(--bdr); }
  .sb-row:last-child { border-bottom:none; }
  .sb-row-label { font-size:13px;color:var(--gray); }
  .sb-row-value { font-family:'Oswald';font-size:13px;font-weight:600;text-align:right; }
  .sb-row-value .pending { color:#bbb;font-weight:400;font-family:'Source Sans 3';font-style:italic;font-size:12px; }
  .sb-price { border-top:2px solid var(--blk);padding:18px 20px;background:var(--gray-lt); }
  .sb-price-line { display:flex;justify-content:space-between;font-size:12px;color:var(--gray);margin-bottom:6px; }
  .sb-price-total { display:flex;justify-content:space-between;align-items:baseline;padding-top:10px;border-top:1px solid var(--bdr); }
  .sb-price-total-label { font-family:'Oswald';font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:0.06em; }
  .sb-price-total-amt { font-family:'Oswald';font-size:28px;font-weight:700;line-height:1; }
  .sb-price-incl { font-size:11px;color:var(--gray);margin-top:10px; }
  .sb-price-incl div { display:flex;align-items:center;gap:5px;margin-bottom:3px; }
  .sb-price-incl div::before { content:'✓';color:var(--red);font-weight:700;font-size:10px; }

  /* SUCCESS */
  .cfg-success { display:none;padding:60px 40px;text-align:center;max-width:580px;margin:0 auto; }
  .cfg-success.show { display:block; }
  .cfg-success-icon { width:72px;height:72px;background:var(--red);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:32px;margin:0 auto 24px;color:var(--wht); }
  .cfg-success h2 { font-family:'Oswald';font-size:32px;font-weight:700;text-transform:uppercase;margin-bottom:10px; }
  .cfg-success p { font-size:15px;color:var(--gray);line-height:1.6;margin-bottom:20px; }

  /* MOBILE */
  @media(max-width:900px) {
    .cfg-nav{padding:0 16px;height:60px;} .cfg-hero{padding:20px 16px;} .cfg-hero h1{font-size:22px;}
    .cfg-progress{padding:0 12px;} .cfg-ps{padding:10px 10px;}
    .cfg-layout{grid-template-columns:1fr;}
    .cfg-right{position:static;height:auto;border-left:none;border-top:1px solid var(--bdr);order:-1;}
    .sb-door{flex-direction:row;padding:16px;gap:16px;} .sb-door svg{width:60px;height:82px;}
    .sb-details{display:none;} .cfg-left{padding:20px 16px;}
    .brand-grid{grid-template-columns:1fr;} .view-grid{grid-template-columns:1fr 1fr;}
    .cols-3{grid-template-columns:120px repeat(3,1fr);} .cmp-cell:first-child{font-size:10px;padding:10px 8px;}
    .opt-grid{grid-template-columns:repeat(auto-fill,minmax(120px,1fr));}
    .sum-grid{grid-template-columns:1fr;} .form-row{grid-template-columns:1fr;}
  }


  /* STEP ERROR MESSAGE */
  .cfg-error { display:none;background:#fff8f8;color:var(--red);border-bottom:1px solid #f0c8cf;padding:12px 40px;font-family:'Source Sans 3',Arial,sans-serif;font-size:14px;font-weight:600; }
  .cfg-error.show { display:block; }
  .cfg-error::before { content:'⚠ ';font-weight:700; }
  @media(max-width:900px){ .cfg-error{padding:10px 16px;font-size:13px;} }