:root {
  color-scheme: dark;
  --bg: #0e0f0f;
  --panel: #171919;
  --panel-2: #202222;
  --text: #f5f6f2;
  --muted: #a5aaa5;
  --line: #303432;
  --accent: #d9f20f;
  --max: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: Inter, Arial, sans-serif; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }

.header { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 38px; min-height: 76px; padding: 0 max(24px, calc((100vw - var(--max)) / 2)); background: rgba(14,15,15,.9); border-bottom: 1px solid var(--line); backdrop-filter: blur(18px); }
.brand { display: inline-flex; align-items: center; white-space: nowrap; }
.brand img { display: block; width: 172px; height: auto; }
.header nav { display: flex; gap: 28px; margin-left: auto; color: #c7cbc7; font-size: 14px; }
.header nav a:hover { color: var(--text); }
.header-cta { padding: 12px 18px; color: #101110; background: var(--accent); border-radius: 8px; font-size: 14px; font-weight: 700; }

.hero { min-height: 690px; display: grid; grid-template-columns: 1.05fr .95fr; max-width: var(--max); margin: 0 auto; padding: 96px 24px 70px; overflow: hidden; }
.hero-content { position: relative; z-index: 2; }
.eyebrow { margin: 0 0 18px; color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; }
h1 { max-width: 850px; margin: 0; font-size: clamp(52px, 7.5vw, 102px); line-height: .91; letter-spacing: -.075em; }
h1 span { color: var(--accent); }
.hero-copy { max-width: 620px; margin: 32px 0 0; color: #bcc1bc; font-size: 18px; line-height: 1.65; }
.hero-actions { display: flex; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 0 22px; border: 1px solid var(--line); border-radius: 9px; cursor: pointer; font-weight: 700; }
.button-primary { color: #0d0e0d; background: var(--accent); border-color: var(--accent); }
.button-secondary { color: var(--text); background: transparent; }
.button:hover { transform: translateY(-1px); }
.hero-facts { display: flex; gap: 42px; margin-top: 62px; }
.hero-facts div { display: flex; flex-direction: column; gap: 4px; }
.hero-facts strong { font-size: 20px; }
.hero-facts span { color: var(--muted); font-size: 13px; }
.hero-visual { position: relative; min-height: 480px; align-self: center; }
.hero-visual img { width: 112%; height: 100%; object-fit: contain; object-position: center; filter: drop-shadow(0 28px 45px rgba(0,0,0,.55)); }

.section { max-width: var(--max); margin: 0 auto; padding: 92px 24px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 34px; }
.section-heading h2, .requirements h2 { margin: 0; font-size: clamp(34px, 5vw, 58px); letter-spacing: -.055em; }
.section-heading > p { max-width: 430px; margin: 0; color: var(--muted); line-height: 1.6; }
.fleet { border-top: 1px solid var(--line); }
.catalog-toolbar { display:flex; align-items:center; justify-content:space-between; margin-bottom:14px; }
.catalog-toolbar p { margin:0; color:var(--muted); }
.catalog-toolbar strong { color:var(--text); }
.premium-filter { padding:11px 15px; color:var(--text); background:var(--panel); border:1px solid var(--line); border-radius:8px; cursor:pointer; font-weight:700; }
.premium-filter.active { color:#101110; background:var(--accent); border-color:var(--accent); }
.filters { display:grid; grid-template-columns:repeat(4,1fr); gap:1px; margin-bottom:30px; padding:1px; background:var(--line); border-radius:10px; }
.filter-dropdown { position:relative; background:var(--panel); }
.filter-dropdown:first-child { border-radius:9px 0 0 9px; }
.filter-dropdown:last-child { border-radius:0 9px 9px 0; }
.filter-dropdown summary { height:70px; display:flex; align-items:center; justify-content:space-between; padding:0 18px; cursor:pointer; list-style:none; }
.filter-dropdown summary::-webkit-details-marker { display:none; }
.filter-dropdown summary span { display:flex; flex-direction:column; gap:7px; }
.filter-dropdown small { color:var(--muted); font-size:11px; text-transform:uppercase; letter-spacing:.07em; }
.filter-dropdown b { font-size:14px; }
.filter-dropdown i { width:9px; height:9px; border-right:2px solid var(--muted); border-bottom:2px solid var(--muted); transform:rotate(45deg); }
.filter-dropdown[open] i { transform:rotate(225deg); }
.filter-menu { position:absolute; z-index:15; left:0; right:0; top:calc(100% + 6px); display:flex; flex-wrap:wrap; gap:7px; min-width:250px; padding:14px; background:#202222; border:1px solid #3b403d; border-radius:10px; box-shadow:0 18px 50px rgba(0,0,0,.45); }
.filter-menu button { padding:8px 10px; color:var(--text); background:#2b2e2d; border:1px solid #414644; border-radius:6px; cursor:pointer; font-size:12px; }
.filter-menu button:hover, .filter-menu button.active { color:#101110; background:var(--accent); border-color:var(--accent); }
.catalog-status { padding: 40px 0; color: var(--muted); }
.catalog { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; }
.bike-card { overflow: hidden; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; transition: transform .2s, border-color .2s; }
.bike-card:hover { transform: translateY(-4px); border-color: #565d57; }
.bike-image { position: relative; aspect-ratio: 16/10; background: radial-gradient(circle at 60% 45%, #353a35, #171918 58%, #111); }
.bike-image img { width: 100%; height: 100%; object-fit: cover; }
.bike-image img:not([src]), .bike-image img[src=""] { display: none; }
.bike-image::after { content: 'RB'; position: absolute; inset: 0; display: grid; place-items: center; color: #2f342f; font-size: 88px; font-weight: 800; letter-spacing: -.1em; z-index: 0; }
.bike-image img, .bike-type { position: relative; z-index: 1; }
.bike-type { position: absolute; left: 14px; top: 14px; padding: 7px 9px; color: #101110; background: var(--accent); border-radius: 5px; font-size: 10px; font-weight: 800; text-transform: uppercase; }
.bike-body { padding: 20px; }
.bike-body h3 { min-height: 48px; margin: 0; font-size: 19px; line-height: 1.3; letter-spacing: -.025em; }
.specs { display: flex; gap: 15px; margin-top: 16px; color: var(--muted); font-size: 12px; }
.bike-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); }
.bike-footer p { margin: 0; color: var(--muted); font-size: 12px; }
.bike-footer strong { display: block; color: var(--text); font-size: 18px; }
.bike-footer button { padding: 10px 12px; color: #101110; background: var(--accent); border: 0; border-radius: 6px; cursor: pointer; font-size: 12px; font-weight: 800; }
.show-more { margin: 28px auto 0; }

.steps { border-top: 1px solid var(--line); }
.step-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.step-grid article { min-height: 240px; padding: 26px; background: var(--panel); }
.step-grid article > span { color: var(--accent); font-size: 12px; font-weight: 800; }
.step-grid h3 { margin: 76px 0 10px; font-size: 24px; }
.step-grid p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.6; }
.requirements { display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; border-top: 1px solid var(--line); }
.requirement-list { display: grid; gap: 10px; }
.requirement-list div { display: flex; align-items: center; gap: 18px; padding: 18px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; }
.requirement-list strong { display: grid; place-items: center; width: 52px; height: 52px; flex: 0 0 52px; color: #111; background: var(--accent); border-radius: 50%; }
.requirement-list span { color: #d9dcd9; line-height: 1.45; }

footer { padding: 62px max(24px, calc((100vw - var(--max)) / 2)); background: #1a1c1b; border-top: 1px solid var(--line); }
.footer-main { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 50px; padding-bottom: 44px; }
.footer-main h3 { margin: 0 0 16px; font-size: 13px; text-transform: uppercase; letter-spacing: .08em; }
.footer-main p, .footer-main div > a:not(.brand) { display: block; margin: 7px 0; color: var(--muted); font-size: 14px; line-height: 1.6; }
.footer-legal { padding-top: 26px; border-top: 1px solid var(--line); color: #7f847f; font-size: 12px; line-height: 1.55; }
.footer-legal p { margin: 4px 0; }

@media (max-width: 900px) {
  .header nav { display: none; }
  .header-cta { margin-left: auto; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-visual { display: block; min-height: 330px; margin-top: 20px; }
  .hero-visual img { width: 100%; }
  .filters { grid-template-columns: repeat(2,1fr); }
  .catalog { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .step-grid { grid-template-columns: repeat(2,1fr); }
  .requirements { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .header { min-height: 66px; padding-inline: 16px; }
  .header-cta { padding: 10px 12px; font-size: 12px; }
  .hero { padding: 66px 16px 52px; }
  .hero-copy { font-size: 16px; }
  .hero-actions, .hero-facts { flex-wrap: wrap; }
  .hero-facts { gap: 24px; margin-top: 42px; }
  .section { padding: 68px 16px; }
  .section-heading { align-items: start; flex-direction: column; }
  .filters, .catalog { grid-template-columns: 1fr; }
  .filter-dropdown, .filter-dropdown:first-child, .filter-dropdown:last-child { border-radius: 8px; }
  .filter-menu { position: static; margin: 0 10px 10px; }
  .step-grid { grid-template-columns: 1fr; }
  .step-grid article { min-height: 190px; }
  .step-grid h3 { margin-top: 40px; }
  .requirements { gap: 34px; }
  footer { padding: 50px 16px; }
  .footer-main { grid-template-columns: 1fr; gap: 28px; }
}