/* ============================================
   Site CSS – 奔驰宝玩城 (benzi-baoma.com.cn)
   版本: 1.0.0
   创意指纹: b1f92f4e8ec80115
   ============================================ */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { min-height: 100vh; font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif; background: #1A1A1A; color: #FFFFFF; line-height: 1.6; overflow-x: hidden; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font: inherit; }

/* ---------- CSS Variables ---------- */
:root {
  --gold: #D4AF37;
  --gold-light: #E8C84A;
  --gold-dark: #B8962E;
  --crimson: #8B0000;
  --crimson-light: #B22222;
  --black: #000000;
  --black-soft: #0D0D0D;
  --dark: #1A1A1A;
  --rock-gray: #8B8682;
  --moss-green: #4A5D23;
  --terracotta: #CC7755;
  --cream: #F5F0E8;
  --neon-blue: #00BFFF;
  --neon-green: #39FF14;
  --text-light: #FFFFFF;
  --text-dark: #000000;
  --bg-dark: #1A1A1A;
  --bg-cream: #F5F0E8;
  --font-heading: 'Overpass', 'Noto Sans SC', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', sans-serif;
  --header-height: 72px;
  --track-width: 4px;
  --content-max: 1200px;
  --gap: 24px;
  --radius: 4px;
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 900; text-transform: uppercase; letter-spacing: 1px; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); background: linear-gradient(135deg, var(--gold), var(--crimson)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; letter-spacing: 2px; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); font-weight: 700; color: var(--gold); letter-spacing: 1px; }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.5rem); font-weight: 600; color: var(--crimson); }
p, li, span, div { font-family: var(--font-body); font-weight: 400; font-size: 1rem; color: var(--text-light); line-height: 1.6; }

/* ---------- Skip Link ---------- */
.skip-link { position: absolute; top: -9999px; left: 0; z-index: 9999; padding: 12px 24px; background: var(--gold); color: var(--black); font-weight: 700; font-size: 0.875rem; }
.skip-link:focus { top: 0; }

/* ---------- Site Header ---------- */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; height: var(--header-height); background: transparent; transition: background var(--transition), box-shadow var(--transition); }
.site-header[data-state="solid"] { background: var(--black); box-shadow: 0 2px 24px rgba(0,0,0,0.8); }
.header__inner { display: flex; align-items: center; justify-content: space-between; max-width: var(--content-max); margin: 0 auto; padding: 0 var(--gap); height: 100%; position: relative; }

/* Brand */
.header__brand { display: flex; align-items: center; gap: 12px; position: relative; }
.brand-track { display: block; width: var(--track-width); height: 40px; background: linear-gradient(180deg, var(--gold), var(--crimson)); border-radius: 2px; flex-shrink: 0; }
.brand-logo { font-family: var(--font-heading); font-weight: 900; font-size: 1.5rem; letter-spacing: 2px; background: linear-gradient(135deg, var(--gold), var(--gold-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; text-transform: uppercase; white-space: nowrap; }

/* Navigation */
.header__nav { display: flex; align-items: center; }
.nav__list { display: flex; gap: 8px; }
.nav__list a { display: block; padding: 8px 16px; font-family: var(--font-body); font-weight: 500; font-size: 0.95rem; color: rgba(255,255,255,0.8); letter-spacing: 0.5px; border-radius: var(--radius); transition: color var(--transition), background var(--transition), box-shadow var(--transition); }
.nav__list a:hover, .nav__list a:focus-visible { color: var(--gold); background: rgba(212,175,55,0.12); box-shadow: 0 0 20px rgba(212,175,55,0.15); }
.nav__list a[aria-current="page"] { color: var(--gold); background: rgba(212,175,55,0.08); box-shadow: inset 0 -2px 0 var(--gold); }

/* CTA */
.header__cta { flex-shrink: 0; margin-left: 16px; }

/* Toggle (mobile) */
.header__toggle { display: none; flex-direction: column; justify-content: center; align-items: center; width: 44px; height: 44px; gap: 5px; border: 1px solid rgba(212,175,55,0.3); border-radius: var(--radius); transition: border-color var(--transition); }
.header__toggle:hover { border-color: var(--gold); }
.toggle__bar { display: block; width: 22px; height: 2px; background: var(--gold); border-radius: 1px; transition: transform var(--transition), opacity var(--transition); }
.header__toggle[aria-expanded="true"] .toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.header__toggle[aria-expanded="true"] .toggle__bar:nth-child(2) { opacity: 0; }
.header__toggle[aria-expanded="true"] .toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Site Footer ---------- */
.site-footer { background: var(--black-soft); border-top: 2px solid rgba(212,175,55,0.15); padding: 48px var(--gap) 24px; }
.footer__inner { max-width: var(--content-max); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 32px 48px; }
.footer__brand { display: flex; flex-direction: column; gap: 8px; }
.footer__brand .brand-track { height: 48px; margin-bottom: 4px; }
.footer__brand .brand-logo { font-size: 1.25rem; }
.footer__tagline { font-size: 0.85rem; color: var(--rock-gray); }
.footer__links { display: flex; flex-direction: column; gap: 12px; align-items: flex-end; justify-content: center; }
.footer__links a { font-size: 0.95rem; color: var(--gold); transition: color var(--transition), text-shadow var(--transition); }
.footer__links a:hover, .footer__links a:focus-visible { color: var(--gold-light); text-shadow: 0 0 12px rgba(212,175,55,0.4); }
.footer__contact { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 16px 32px; padding: 16px 0; border-top: 1px solid rgba(212,175,55,0.1); border-bottom: 1px solid rgba(212,175,55,0.1); }
.footer__contact span { font-size: 0.9rem; color: var(--rock-gray); }
.footer__contact a { color: var(--neon-blue); transition: color var(--transition); }
.footer__contact a:hover { color: var(--neon-green); }
.footer__note { grid-column: 1 / -1; font-size: 0.8rem; color: var(--rock-gray); font-style: italic; }
.footer__bottom { grid-column: 1 / -1; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; padding-top: 16px; font-size: 0.8rem; color: var(--rock-gray); }
.footer__icp { color: var(--rock-gray); }
.footer__trust { flex: 1; text-align: center; color: rgba(139,134,130,0.7); font-size: 0.75rem; }
.footer__copy { color: var(--rock-gray); white-space: nowrap; }

/* ---------- Buttons ---------- */
.btn-gold { display: inline-flex; align-items: center; justify-content: center; padding: 10px 28px; font-family: var(--font-heading); font-weight: 700; font-size: 0.9rem; letter-spacing: 1px; text-transform: uppercase; color: var(--black); background: linear-gradient(135deg, var(--gold), var(--gold-dark)); border: 2px solid var(--gold); border-radius: var(--radius); transition: transform var(--transition), box-shadow var(--transition), background var(--transition); }
.btn-gold:hover, .btn-gold:focus-visible { transform: scale(1.04); box-shadow: 0 0 32px rgba(212,175,55,0.35); background: linear-gradient(135deg, var(--gold-light), var(--gold)); }
.btn-gold:active { transform: scale(0.97); }
.btn-outline { display: inline-flex; align-items: center; justify-content: center; padding: 10px 28px; font-family: var(--font-heading); font-weight: 600; font-size: 0.9rem; letter-spacing: 1px; text-transform: uppercase; color: var(--crimson); border: 2px solid var(--crimson); border-radius: var(--radius); background: transparent; transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition); }
.btn-outline:hover, .btn-outline:focus-visible { background: var(--crimson); color: var(--text-light); transform: scale(1.04); box-shadow: 0 0 24px rgba(139,0,0,0.3); }
.btn-outline:active { transform: scale(0.97); }

/* ---------- Breadcrumb ---------- */
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px 16px; padding: 12px 0; font-size: 0.85rem; color: var(--rock-gray); }
.breadcrumb a { color: var(--gold); transition: color var(--transition); }
.breadcrumb a:hover { color: var(--gold-light); }
.breadcrumb span + span::before { content: "▶"; color: var(--crimson); margin-right: 12px; font-size: 0.6rem; }

/* ---------- Content Container ---------- */
.content-container { max-width: var(--content-max); margin: 0 auto; padding: 0 var(--gap); }

/* ---------- Grids ---------- */
.grid-2, .grid-3, .grid-4 { display: grid; gap: var(--gap); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- Tracked Layout (Side Rail) ---------- */
.tracked-layout { display: flex; gap: 0; max-width: var(--content-max); margin: 0 auto; padding-left: var(--gap); }
.tracked-layout .tracked-rail { flex-shrink: 0; width: 48px; display: flex; flex-direction: column; align-items: center; padding-top: 12px; position: relative; }
.tracked-layout .tracked-rail::before { content: ""; display: block; width: var(--track-width); flex: 1; min-height: 120px; background: linear-gradient(180deg, var(--gold), var(--crimson), rgba(139,0,0,0.2)); border-radius: 2px; }
.tracked-layout .tracked-rail .rail__marker { width: 12px; height: 12px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 20px rgba(212,175,55,0.5); margin: 8px 0; flex-shrink: 0; }
.tracked-layout .tracked-content { flex: 1; min-width: 0; padding: 0 var(--gap) 0 calc(var(--gap) + 12px); }

/* ---------- Section Preview (首屏预览) ---------- */
.section-preview { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: var(--gap); padding: 24px 0; }
.preview-card { background: rgba(13,13,13,0.85); border: 1px solid rgba(212,175,55,0.12); padding: 24px; border-radius: var(--radius); transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition); }
.preview-card:hover { border-color: rgba(212,175,55,0.4); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.5); }
.preview-card__icon { font-size: 2rem; margin-bottom: 12px; color: var(--gold); }
.preview-card__title { font-family: var(--font-heading); font-weight: 700; font-size: 1.1rem; color: var(--gold); margin-bottom: 8px; }
.preview-card__desc { font-size: 0.9rem; color: var(--rock-gray); }

/* ---------- Scroll Progress Bar ---------- */
[data-scroll-progress] { position: fixed; top: 0; left: 0; width: 100%; height: 3px; z-index: 1001; background: transparent; pointer-events: none; }
[data-scroll-progress]::after { content: ""; display: block; height: 100%; background: linear-gradient(90deg, var(--gold), var(--crimson), var(--neon-blue)); width: 0%; transition: width 0.1s linear; }

/* ---------- Focus Visible ---------- */
:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
  .preview-card:hover { transform: none; }
  .btn-gold:hover, .btn-outline:hover { transform: none; }
  [data-scroll-progress] { display: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .footer__inner { grid-template-columns: 1fr; gap: 24px; }
  .footer__links { align-items: flex-start; }
  .footer__bottom { flex-direction: column; text-align: center; }
  .tracked-layout .tracked-rail { width: 32px; }
  .tracked-layout .tracked-content { padding-left: var(--gap); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --header-height: 64px; --gap: 16px; }
  .header__nav { position: fixed; top: var(--header-height); left: 0; right: 0; background: var(--black); padding: 16px var(--gap); flex-direction: column; align-items: stretch; transform: translateY(-120%); opacity: 0; transition: transform var(--transition), opacity var(--transition); box-shadow: 0 8px 32px rgba(0,0,0,0.8); border-bottom: 2px solid rgba(212,175,55,0.2); }
  .header__nav[data-open] { transform: translateY(0); opacity: 1; }
  .nav__list { flex-direction: column; gap: 4px; }
  .nav__list a { padding: 12px 16px; font-size: 1rem; }
  .header__toggle { display: flex; }
  .header__cta { display: none; }
  .header__cta.mobile-visible { display: inline-flex; margin-left: 0; margin-top: 12px; width: 100%; justify-content: center; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .tracked-layout { flex-direction: column; padding-left: 0; }
  .tracked-layout .tracked-rail { flex-direction: row; width: 100%; height: 32px; padding-top: 0; }
  .tracked-layout .tracked-rail::before { width: 100%; height: var(--track-width); min-height: unset; background: linear-gradient(90deg, var(--gold), var(--crimson), rgba(139,0,0,0.2)); }
  .tracked-layout .tracked-rail .rail__marker { margin: 0 8px; }
  .tracked-layout .tracked-content { padding: var(--gap) 0; }
  .section-preview { grid-template-columns: 1fr; }
  .footer__contact { flex-direction: column; gap: 8px; }
  .footer__bottom { flex-direction: column; gap: 8px; }
}

@media (max-width: 480px) {
  .brand-logo { font-size: 1.1rem; }
  .brand-track { height: 32px; }
  .header__inner { padding: 0 12px; }
  .content-container { padding: 0 12px; }
  .btn-gold { padding: 8px 20px; font-size: 0.8rem; }
  .btn-outline { padding: 8px 20px; font-size: 0.8rem; }
}