:root {
  --red: #e30613;
  --dark-red: #b3050f;
  --yellow: #ffd400;
  --dark: #1a1a1a;
  --gray: #555;
  --bg: #f5f6f8;
  --card: #ffffff;
  --border: #e3e5e8;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif; color: var(--dark); background: var(--bg); }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.site-header { background: #fff; border-bottom: 3px solid var(--red); position: sticky; top: 0; z-index: 10; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { text-decoration: none; font-weight: 800; font-size: 20px; color: var(--dark); display: flex; align-items: center; gap: 8px; }
.brand-mark { background: var(--yellow); color: var(--red); border-radius: 6px; padding: 3px 7px; font-weight: 900; }
nav a { margin-left: 20px; color: var(--gray); text-decoration: none; font-weight: 600; }
nav a:hover { color: var(--red); }
main.wrap { padding: 30px 20px 60px; }
.page-title { margin: 0 0 24px; font-size: 28px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.card { background: var(--card); border: 1px solid var(--border); border-top: 4px solid var(--red); border-radius: 10px; padding: 20px; box-shadow: 0 1px 3px rgba(0,0,0,.06); }
.card h3 { margin: 0 0 12px; color: var(--dark-red); }
.card-body p { margin: 0 0 8px; line-height: 1.55; }
.card-body ul { margin: 0; padding-left: 20px; }
.contacts { margin-top: 40px; background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 20px; }
.contacts h2 { margin: 0 0 12px; color: var(--dark-red); }
.contacts ul { margin: 0; padding-left: 20px; line-height: 1.8; }
.groups { display: flex; flex-direction: column; gap: 14px; }
.group { background: var(--card); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.group summary { cursor: pointer; padding: 16px 20px; font-weight: 700; font-size: 17px; list-style: none; display: flex; align-items: center; justify-content: space-between; }
.group summary::after { content: "▾"; color: var(--red); transition: transform .15s; }
.group[open] summary::after { transform: rotate(180deg); }
.group summary:hover { color: var(--red); }
.items { border-top: 1px solid var(--border); }
.item { display: grid; grid-template-columns: 1fr auto 90px; gap: 16px; align-items: center; padding: 12px 20px; border-bottom: 1px solid var(--border); }
.item:last-child { border-bottom: none; }
.item-name { font-weight: 600; }
.item-unit { display: block; font-weight: 400; color: var(--gray); font-size: 13px; }
.item-price { font-weight: 700; white-space: nowrap; }
.qty { width: 70px; padding: 8px; border: 1px solid var(--border); border-radius: 8px; font-size: 15px; text-align: center; }
.qty:focus { outline: 2px solid var(--yellow); border-color: var(--red); }
.buy-bar { position: sticky; bottom: 0; background: linear-gradient(transparent, var(--bg)); padding: 20px 0 10px; display: flex; justify-content: flex-end; }
.buy-btn { background: var(--red); color: #fff; border: none; border-radius: 10px; padding: 16px 32px; font-size: 18px; font-weight: 800; cursor: pointer; box-shadow: 0 4px 12px rgba(227,6,19,.35); transition: background .15s; }
.buy-btn:hover:not(:disabled) { background: var(--dark-red); }
.buy-btn:disabled { background: #c7c9cc; box-shadow: none; cursor: not-allowed; }
.site-footer { background: #fff; border-top: 1px solid var(--border); padding: 20px 0; color: var(--gray); font-size: 14px; text-align: center; }