:root {
  --bg: #ffffff;
  --bg-grey: #f5f6f8;
  --bg-blue: #eef3fb;
  --text: #1b2433;
  --text-dim: #677085;
  --primary: #2f5fd6;
  --primary-dark: #2347ad;
  --border: #e4e7ee;
  --radius: 12px;
  --max-width: 1180px;

  --red: #e5484d;
  --purple: #8b5cf6;
  --blue: #2f5fd6;
  --green: #22a26b;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 15px;
}
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--primary);
  text-decoration: none;
  font-size: 19px;
}
.nav {
  display: flex;
  gap: 6px;
}
.nav-link {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  padding: 8px 16px;
  border-radius: 999px;
  transition: all 0.2s ease;
}
.nav-link:hover { color: var(--primary); }
.nav-link.active { background: var(--bg-blue); color: var(--primary); font-weight: 600; }

.nav-item-dropdown {
  position: relative;
}
.nav-item-dropdown:hover > .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-link-parent { display: inline-block; }
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 140px;
  padding: 6px;
  margin-top: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 24px rgba(20, 30, 60, 0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all 0.18s ease;
  z-index: 60;
}
/* nested (3rd level) flyout — opens to the right of its parent dropdown item */
.nav-dropdown .nav-dropdown {
  top: 0;
  left: 100%;
  margin-top: 0;
  margin-left: 6px;
  transform: translateX(-6px);
}
.nav-dropdown .nav-item-dropdown:hover > .nav-dropdown {
  transform: translateX(0);
}
.nav-dropdown-link {
  display: block;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
}
.nav-dropdown-link:hover { background: var(--bg-blue); color: var(--primary); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  position: relative;
  transition: background 0.15s ease;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--text);
  transition: transform 0.2s ease, top 0.2s ease, opacity 0.2s ease;
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); }

/* hero */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  color: #fff;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8,14,28,0.45) 0%, rgba(8,14,28,0.55) 60%, rgba(8,14,28,0.75) 100%);
}
.hero-inner { position: relative; max-width: 760px; }
.hero h1 {
  font-size: clamp(48px, 7vw, 84px);
  font-weight: 800;
  letter-spacing: 0.02em;
  margin: 0 0 24px;
  text-shadow: 0 2px 24px rgba(0,0,0,0.35);
}
.hero-en {
  font-size: clamp(18px, 2.2vw, 26px);
  font-weight: 500;
  margin: 0 0 16px;
  letter-spacing: 0.01em;
}
.hero-cn {
  font-size: 16px;
  color: rgba(255,255,255,0.82);
  margin: 0;
}
.hero-scroll {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.85);
  animation: bounce 2s infinite;
}
.hero-scroll svg { width: 28px; height: 28px; }
@keyframes bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* about */
.about-section { padding: 80px 0; }
.about-layout { max-width: 820px; margin: 0 auto; text-align: center; }
.about-layout .lead { font-size: 17px; color: var(--text); }
.about-layout p { color: var(--text-dim); }

/* sections */
.section { padding: 88px 0; }
.section-grey { background: var(--bg-grey); }
.section-blue { background: var(--bg-blue); }
.section-title-center, .section-desc-center { text-align: center; }
.section-title-center {
  font-size: clamp(28px, 3.6vw, 38px);
  font-weight: 800;
  margin: 0 0 14px;
  letter-spacing: 0.01em;
}
.section-desc-center {
  color: var(--text-dim);
  font-size: 15px;
  margin: 0 auto 48px;
  max-width: 560px;
}
.section-title {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  margin: 0 0 14px;
}
.section-desc {
  color: var(--text-dim);
  max-width: 680px;
  margin-bottom: 40px;
  font-size: 14.5px;
}

/* brand cards */
.brand-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.brand-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border-left: 4px solid transparent;
  box-shadow: 0 1px 3px rgba(20,30,60,0.06);
  display: flex;
  flex-direction: column;
}
.brand-card.accent-red { border-left-color: var(--red); }
.brand-card.accent-purple { border-left-color: var(--purple); }
.brand-card.accent-blue { border-left-color: var(--blue); }
.brand-card.accent-green { border-left-color: var(--green); }
.brand-card-img { aspect-ratio: 4 / 3; overflow: hidden; }
.brand-card-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.brand-card-body { padding: 20px 22px 24px; }
.brand-card-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.brand-card-head h3 { margin: 0; font-size: 19px; font-weight: 700; }
.brand-card-body p { margin: 0; color: var(--text-dim); font-size: 13.5px; }

.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 11px;
  border-radius: 999px;
}
.badge-red { background: rgba(229,72,77,0.1); color: var(--red); }
.badge-purple { background: rgba(139,92,246,0.1); color: var(--purple); }
.badge-blue { background: rgba(47,95,214,0.1); color: var(--blue); }
.badge-green { background: rgba(34,162,107,0.1); color: var(--green); }
.badge-green-soft { background: rgba(34,162,107,0.12); color: var(--green); }

/* operation */
.operation-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.operation-img {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(20,30,60,0.08);
}
.operation-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.operation-body p { color: var(--text-dim); margin: 0 0 24px; }
.check-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.check-list li {
  position: relative;
  padding-left: 22px;
  color: var(--text);
  font-size: 14.5px;
}
.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
}

/* marketing grid */
.marketing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.marketing-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
}
.marketing-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--bg-blue);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.marketing-icon svg { width: 22px; height: 22px; }
.marketing-card h3 { margin: 0 0 8px; font-size: 16px; font-weight: 700; }
.marketing-card p { margin: 0; color: var(--text-dim); font-size: 13.5px; }

/* contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
}
.contact-list { list-style: none; padding: 0; margin: 0; color: var(--text-dim); display: grid; gap: 12px; }
.contact-list strong { color: var(--text); }
.contact-form {
  background: var(--bg-grey);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: grid;
  gap: 16px;
}
.contact-form label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--text-dim);
}
.contact-form input, .contact-form textarea {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
}

/* footer */
.site-footer {
  background: #131b2c;
  color: #c4cad8;
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-logo { color: #fff; font-size: 20px; font-weight: 800; margin: 0 0 16px; letter-spacing: 0.04em; }
.footer-en { color: #fff; font-size: 14px; margin: 0 0 10px; }
.footer-cn { color: #8a93a8; font-size: 13.5px; margin: 0; max-width: 320px; }
.site-footer h4 { color: #fff; font-size: 15px; margin: 0 0 20px; }
.footer-contact { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
.footer-contact li { display: flex; gap: 12px; font-size: 13.5px; color: #aab1c2; }
.footer-contact svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 1px; color: #8a93a8; }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #c4cad8;
  text-decoration: none;
}
.footer-social svg { width: 17px; height: 17px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 22px 0;
  text-align: center;
  font-size: 13px;
  color: #7e869a;
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 2px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 16px 28px rgba(20, 30, 60, 0.1);
    padding: 12px 24px 20px;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }
  .nav.nav-open { display: flex; }
  .nav-link { padding: 12px 6px; border-radius: 6px; }
  .nav-item-dropdown { display: block; }
  .nav-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    margin: 0 0 4px 14px;
    padding: 0;
    min-width: 0;
  }
  .nav-dropdown .nav-dropdown { margin-left: 14px; }
  .nav-dropdown-link { padding: 10px 6px; }

  .contact-grid { grid-template-columns: 1fr; }
  .operation-layout { grid-template-columns: 1fr; }
  .marketing-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .brand-detail-gallery { grid-template-columns: 1fr; }
}

/* brand detail page */
.brand-breadcrumb {
  padding: 18px 0 0;
  font-size: 13px;
  color: var(--text-dim);
}
.brand-breadcrumb a { color: var(--primary); text-decoration: none; }
.brand-detail-hero {
  padding: 24px 0 8px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.brand-detail-hero h1 { font-size: 32px; margin: 0; }
.brand-detail-desc {
  color: var(--text-dim);
  font-size: 15.5px;
  max-width: 720px;
  margin: 12px 0 28px;
}
.brand-detail-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}
.brand-detail-gallery img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.brand-detail-body {
  max-width: 760px;
  margin-bottom: 28px;
  white-space: pre-line;
}
.brand-detail-highlights {
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  max-width: 760px;
}
.brand-detail-highlights li {
  background: var(--bg-grey);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14.5px;
}
.brand-not-found {
  padding: 80px 0;
  text-align: center;
  color: var(--text-dim);
}
.hidden { display: none !important; }
@media (max-width: 640px) {
  .brand-detail-highlights { grid-template-columns: 1fr; }
}