* { box-sizing: border-box; }
:root {
  --bg: #0b0f14;
  --bg-soft: #131a22;
  --text: #e8eef5;
  --text-soft: #afbbc9;
  --brand: #35d07f;
  --brand-dark: #23b66c;
  --card: #161f2a;
  --line: #273241;
}
html, body {
  margin: 0;
  padding: 0;
  font-family: "Inter", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  scroll-behavior: smooth;
}
a { color: inherit; text-decoration: none; }
.container { width: min(1120px, 92%); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(11, 15, 20, 0.84);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.nav-wrap { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.logo { font-size: 1.3rem; font-weight: 800; }
.logo span { color: var(--brand); }
.site-nav { display: flex; align-items: center; gap: 1rem; }
.site-nav a { color: var(--text-soft); }
.site-nav a:hover { color: var(--text); }
.menu-btn {
  display: none; border: 1px solid var(--line); border-radius: 8px; padding: 0.3rem 0.55rem;
  background: transparent; color: var(--text); font-size: 1.1rem;
}
.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.lang-btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text-soft);
  border-radius: 8px;
  padding: 0.36rem 0.55rem;
  font-size: 0.85rem;
  cursor: pointer;
}
.lang-btn.active {
  color: #04130b;
  background: var(--brand);
  border-color: var(--brand);
}
.section { padding: 82px 0; }
.section-dark { background: var(--bg-soft); }
.hero {
  padding: 92px 0 72px;
  background: radial-gradient(circle at 80% 0%, #1d2a36 0, transparent 35%), var(--bg);
}
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 2rem; align-items: center; }
.kicker {
  color: var(--brand); font-weight: 700; text-transform: uppercase; letter-spacing: .12em;
  font-size: .78rem; margin-bottom: .75rem;
}
h1, h2, h3 { margin: 0 0 .9rem; line-height: 1.2; }
h1 { font-size: clamp(2rem, 4.5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3.3vw, 2.35rem); }
.lead { color: var(--text-soft); line-height: 1.7; max-width: 62ch; }
.hero-actions { margin-top: 1.5rem; display: flex; gap: .7rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border: none; border-radius: 12px; padding: .78rem 1.25rem; font-weight: 700; cursor: pointer;
  color: #04130b; background: var(--brand); transition: .2s ease;
}
.btn:hover { background: var(--brand-dark); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn-sm { padding: .55rem .95rem; border-radius: 10px; font-size: .92rem; }
.hero-card, .card, .quote-form {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
}
.hero-card { padding: 1.25rem; }
.hero-card ul { margin: 0; padding-left: 1.1rem; color: var(--text-soft); line-height: 1.85; }
.price-row { margin-top: 1rem; display: flex; align-items: center; justify-content: space-between; gap: .75rem; }
.price { font-size: 1.3rem; font-weight: 800; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.pillars { display: grid; gap: .9rem; }
.card { padding: 1rem; }
.card p { color: var(--text-soft); margin: 0; line-height: 1.6; }
.bike-grid, .feature-grid, .news-grid {
  margin-top: 1.1rem; display: grid; grid-template-columns: repeat(3, 1fr); gap: .95rem;
}
.bike-card img {
  width: 100%; height: 170px; object-fit: cover; border-radius: 10px; border: 1px solid var(--line);
  margin-bottom: .75rem;
}
.bike-card .meta { color: var(--text-soft); margin: .2rem 0; }
.bike-card .bike-price { margin-top: .55rem; font-weight: 700; color: var(--brand); }
.faq-list { display: grid; gap: .75rem; margin-top: 1rem; }
details { border: 1px solid var(--line); background: var(--card); border-radius: 12px; padding: .85rem 1rem; }
summary { cursor: pointer; font-weight: 600; }
details p { color: var(--text-soft); margin: .65rem 0 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.contact-list { margin: 1rem 0 0; padding-left: 1rem; color: var(--text-soft); line-height: 1.8; }
.quote-form { padding: 1rem; display: grid; gap: .7rem; }
.quote-form input, .quote-form select, .quote-form textarea {
  width: 100%; border: 1px solid var(--line); background: #0e151c; color: var(--text);
  border-radius: 10px; padding: .75rem; font: inherit;
}
.quote-form textarea { resize: vertical; }
.form-msg { min-height: 1.4em; margin: 0; color: var(--brand); font-weight: 600; }
.site-footer { border-top: 1px solid var(--line); padding: 1rem 0; }
.footer-wrap {
  display: flex; align-items: center; justify-content: space-between; gap: .8rem; color: var(--text-soft);
}
@media (max-width: 920px) {
  .hero-grid, .split, .contact-grid, .bike-grid, .feature-grid, .news-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .menu-btn { display: inline-flex; }
  .site-nav {
    position: absolute; top: 68px; left: 4%; right: 4%;
    background: #0f161d; border: 1px solid var(--line); border-radius: 12px; padding: .65rem;
    display: none; flex-direction: column; align-items: stretch;
  }
  .lang-switch {
    margin-left: auto;
  }
  .site-nav.show { display: flex; }
  .hero-grid, .split, .contact-grid, .bike-grid, .feature-grid, .news-grid, .footer-wrap { grid-template-columns: 1fr; }
}