/* ============================================================
   FGD WHEELS — Forged Wheels for Trucks & Off-Road
   深色工业风设计系统
   ============================================================ */

:root {
  --bg: #0a0a0b;
  --bg-2: #111113;
  --bg-3: #17171a;
  --surface: #1c1c20;
  --border: #2a2a30;
  --border-2: #36363e;

  --text: #f5f5f7;
  --text-2: #b8b8c0;
  --text-3: #7a7a86;

  --accent: #d42b1e;        /* 锻造红，工业感主色 */
  --accent-2: #e8452f;
  --gold: #c9a24b;          /* 金属金，点缀 */

  --font-display: 'Barlow Condensed', 'Oswald', 'Arial Narrow', sans-serif;
  --font-body: 'Inter', 'Segoe UI', -apple-system, sans-serif;

  --max-w: 1280px;
  --radius: 4px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- 顶部导航 ---------- */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}
.topbar.scrolled { background: rgba(10, 10, 11, 0.96); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 88px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
/* 专用 logo 字图：FGD WHEELS 为固定字图，非普通字体 */
.brand-mark {
  display: block;
  width: auto;
  height: 40px;
  image-rendering: -webkit-optimize-contrast;
}
.nav-logo img { height: 40px; width: auto; }
.nav-logo .wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 28px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.nav-logo .wordmark span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-2);
  position: relative;
  transition: color 0.25s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width 0.25s;
}
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 11px 22px;
  border-radius: var(--radius);
  transition: background 0.25s, transform 0.15s;
}
.nav-cta:hover { background: var(--accent-2); transform: translateY(-1px); }

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}
.nav-burger span {
  width: 24px; height: 2px;
  background: var(--text);
  transition: 0.3s;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.2s ease;
  will-change: opacity;
}
.hero-bg.active {
  opacity: 1;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,10,11,0.55) 0%, rgba(10,10,11,0.75) 55%, var(--bg) 100%);
}
.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 40%, rgba(212,43,30,0.15) 0%, transparent 55%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 160px 0 120px;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 28px;
}
.hero-eyebrow::before {
  content: '';
  width: 40px; height: 1px;
  background: var(--gold);
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(52px, 8vw, 110px);
  line-height: 0.95;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  margin-bottom: 28px;
}
.hero h1 .accent { color: var(--accent); }
.hero p.lead {
  font-size: 19px;
  color: var(--text-2);
  max-width: 620px;
  margin-bottom: 40px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 30px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.25s;
  border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-2); transform: translateY(-2px); }
.btn-ghost {
  background: transparent;
  border-color: var(--border-2);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--text); }

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 70px;
  flex-wrap: wrap;
}
.hero-stat .num {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}
.hero-stat .num span { color: var(--accent); }
.hero-stat .label {
  font-size: 13px;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 6px;
}

/* ---------- 通用 section ---------- */
.section { padding: 110px 0; }
.section-header { margin-bottom: 60px; }
.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.section-header h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(38px, 5vw, 60px);
  text-transform: uppercase;
  line-height: 1.05;
  letter-spacing: 0.01em;
}
.section-header p {
  color: var(--text-2);
  max-width: 640px;
  margin-top: 18px;
  font-size: 17px;
}
.section-header.center { text-align: center; }
.section-header.center p { margin-left: auto; margin-right: auto; }

/* ---------- 产品线网格 ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.product-card {
  position: relative;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.35s, border-color 0.35s;
}
.product-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-2);
}
.product-card .thumb {
  aspect-ratio: 1 / 1;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.product-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 24px;
  transition: transform 0.5s;
}
.product-card:hover .thumb img { transform: scale(1.06); }
.product-card .info {
  padding: 24px;
  border-top: 1px solid var(--border);
}
.product-card .info h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.product-card .info .sub {
  color: var(--text-3);
  font-size: 14px;
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.product-card .info .desc {
  color: var(--text-2);
  font-size: 14px;
  margin-top: 12px;
}
.product-card .link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 16px;
}
.product-card .link:hover { gap: 12px; }

/* ---------- 品牌实力带 ---------- */
.feature-band {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  padding: 70px 0;
}
.feature-item .icon {
  font-size: 30px;
  color: var(--accent);
  margin-bottom: 18px;
}
.feature-item .icon.cert-badge {
  display: inline-block;
  line-height: 0;
}
.feature-item .icon.cert-badge svg {
  display: block;
}
.feature-item h4 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}
.feature-item p {
  color: var(--text-2);
  font-size: 14px;
}

/* ---------- 信任背书：认证徽章墙 + 社会证明 ---------- */
.trust-section {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cert-wall {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  margin-top: 36px;
}
.cert-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 26px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-align: center;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.cert-badge:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}
.cert-code {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
  text-transform: uppercase;
}
.cert-name {
  font-size: 12px;
  color: var(--text-2);
  letter-spacing: 0.02em;
}
.trust-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 40px;
  padding: 32px 40px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.trust-stat {
  flex: 1;
  text-align: center;
}
.trust-num {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--text);
}
.trust-num span {
  font-size: 24px;
  color: var(--accent);
  margin-left: 2px;
}
.trust-label {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-2);
  letter-spacing: 0.02em;
}
.trust-divider {
  width: 1px;
  height: 48px;
  background: var(--border-2);
  flex-shrink: 0;
}
.trust-note {
  margin-top: 22px;
  text-align: center;
  font-size: 14px;
  color: var(--text-2);
}

@media (max-width: 900px) {
  .cert-wall {
    grid-template-columns: repeat(3, 1fr);
  }
  .trust-bar {
    flex-wrap: wrap;
    gap: 16px;
  }
  .trust-stat {
    flex: 1 1 40%;
  }
  .trust-divider {
    display: none;
  }
}
@media (max-width: 560px) {
  .cert-wall {
    grid-template-columns: repeat(2, 1fr);
  }
  .trust-stat {
    flex: 1 1 100%;
  }
}

/* ---------- 系列展示 ---------- */
.series-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.series-card {
  position: relative;
  aspect-ratio: 3 / 4;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.35s, border-color 0.35s;
}
.series-card:hover { transform: translateY(-5px); border-color: var(--border-2); }
.series-card .letter {
  position: absolute;
  top: 20px; left: 24px;
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 700;
  color: rgba(255,255,255,0.12);
  line-height: 1;
}
.series-card img {
  width: 100%; height: 100%;
  object-fit: contain;
  padding: 30px;
  transition: transform 0.5s;
}
.series-card:hover img { transform: scale(1.05); }
/* hover 换图：第二张图默认隐藏，悬停时淡入替代第一张 */
.series-card .hover-img {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.4s ease, transform 0.5s;
}
.series-card:hover .hover-img {
  opacity: 1;
  transform: scale(1.05);
}
.series-card:hover img:not(.hover-img) {
  transform: scale(1.12); /* 主图额外放大，强化切换感知 */
}
.series-card .name {
  position: absolute;
  bottom: 20px; left: 24px;
  right: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.series-card .name span {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.series-card .name .count {
  font-size: 12px;
  color: var(--text-3);
}

/* ---------- 表面处理 ---------- */
.finish-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.finish-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.finish-card .thumb {
  aspect-ratio: 1 / 1;
  background: #fff;
}
.finish-card .thumb img {
  width: 100%; height: 100%;
  object-fit: contain;
  padding: 22px;
}
.finish-card .label {
  padding: 18px;
  text-align: center;
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-top: 1px solid var(--border);
}

/* ---------- 画廊 ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.gallery-item {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--radius);
  position: relative;
  display: block;
  background: var(--bg-2);
  border: 1px solid var(--border);
}
.gallery-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.gallery-item:hover img { transform: scale(1.06); }
.gallery-more {
  text-align: center;
  margin-top: 32px;
}

/* ---------- 询盘表单 ---------- */
.inquiry {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
}
.inquiry-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.inquiry-info h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 4vw, 54px);
  text-transform: uppercase;
  line-height: 1.05;
  margin-bottom: 20px;
}
.inquiry-info p {
  color: var(--text-2);
  margin-bottom: 36px;
}
.contact-row {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
}
.contact-row .icon { font-size: 20px; color: var(--accent); }
.contact-row .label {
  font-size: 12px;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.contact-row .value { font-size: 16px; color: var(--text); }

.form { display: flex; flex-direction: column; gap: 16px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form input,
.form textarea {
  width: 100%;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--text);
  font-size: 15px;
  font-family: var(--font-body);
  transition: border-color 0.25s;
}
.form input::placeholder,
.form textarea::placeholder { color: var(--text-3); }
.form input:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form textarea { resize: vertical; min-height: 120px; }
.form .btn { justify-content: center; width: 100%; margin-top: 8px; }

/* ---------- 页脚 ---------- */
.footer {
  background: #060607;
  border-top: 1px solid var(--border);
  padding: 70px 0 30px;
}
.footer-top {
  display: flex;
  align-items: flex-start;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand img { height: 56px; width: auto; margin-bottom: 18px; }
.footer-brand img.footer-mark { height: 56px; }
.footer-brand p {
  color: var(--text-3);
  font-size: 14px;
  max-width: 320px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 50px;
}
.footer h5 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-2);
  margin-bottom: 18px;
}
.footer ul li { margin-bottom: 12px; }
.footer ul a {
  color: var(--text-3);
  font-size: 14px;
  transition: color 0.25s;
}
.footer ul a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 26px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--text-3);
  font-size: 13px;
}

/* 简化版页脚（products / series 系列页使用 .footer-inner 结构） */
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
}
.footer-links a {
  color: var(--text-3);
  font-size: 14px;
  transition: color 0.25s;
}
.footer-links a:hover { color: var(--text); }
.footer-note {
  width: 100%;
  border-top: 1px solid var(--border);
  padding-top: 26px;
  margin-top: 10px;
  color: var(--text-3);
  font-size: 13px;
}

/* ---------- 国际站店铺入口徽章 ---------- */
.footer-actions {
  width: 100%;
  border-top: 1px solid var(--border);
  margin-top: 26px;
  padding-top: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  transition: border-color 0.25s, background 0.25s, transform 0.25s;
}
.store-badge:hover {
  border-color: #ff6a00;
  background: linear-gradient(135deg, rgba(255,106,0,0.08), rgba(255,106,0,0.02));
  transform: translateY(-2px);
}
.store-badge:hover .store-name { color: var(--text); }
.store-badge .store-mark {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #ff6a00;
  white-space: nowrap;
}
.store-badge .store-mark span { color: #fff; }
.store-badge .store-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.25;
}
.store-badge .store-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
  transition: color 0.25s;
}
.store-badge .store-sub {
  font-size: 12px;
  color: var(--text-3);
}
.store-badge .store-arrow {
  color: #ff6a00;
  font-size: 16px;
  transition: transform 0.25s;
}
.store-badge:hover .store-arrow { transform: translateX(3px); }

/* ---------- 社媒图标行 ---------- */
.social-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.social-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  white-space: nowrap;
}
.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--text-2);
  transition: border-color 0.25s, color 0.25s, background 0.25s, transform 0.25s;
}
.social-link svg { width: 19px; height: 19px; fill: currentColor; }
.social-link:hover {
  color: #fff;
  transform: translateY(-3px);
}
.social-link[data-brand="x"]:hover       { border-color: #fff; background: rgba(255,255,255,0.08); }
.social-link[data-brand="instagram"]:hover { border-color: #e1306c; background: rgba(225,48,108,0.15); }
.social-link[data-brand="facebook"]:hover { border-color: #1877f2; background: rgba(24,119,242,0.15); }
.social-link[data-brand="tiktok"]:hover  { border-color: #25f4ee; background: rgba(37,244,238,0.12); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .series-grid { grid-template-columns: repeat(2, 1fr); }
  .finish-grid { grid-template-columns: repeat(2, 1fr); }
  .inquiry-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-top { flex-direction: column; gap: 20px; }
}
@media (max-width: 720px) {
  .container { padding: 0 20px; }
  .nav-links {
    display: none;
    position: absolute;
    top: 88px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    background: rgba(10, 10, 11, 0.98);
    padding: 24px 32px;
    border-bottom: 1px solid var(--border);
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-burger { display: flex; }
  .nav-burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-burger.active span:nth-child(2) { opacity: 0; }
  .nav-burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .product-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .series-grid { grid-template-columns: 1fr; }
  .finish-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .hero-stats { gap: 28px; }
  .footer-inner { flex-direction: column; gap: 28px; }
  .footer-links { gap: 10px 20px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-top { margin-bottom: 30px; }

  /* ---- 手机端 Hero：标题与轮毂图上下分区，避免标题遮挡轮毂 ---- */
  .hero {
    min-height: 0;
    height: auto;
    flex-direction: column;
    align-items: stretch;
    padding-top: 88px; /* 给固定导航留白 */
  }
  .hero-slides,
  .hero-slides .hero-bg {
    position: relative;
    inset: auto;
    width: 100%;
  }
  /* 背景图容器：标题下方独立一块，轮毂完整显示 */
  .hero-slides {
    order: 2;
    display: block;
    height: 0;
    padding-bottom: 100%; /* 1:1 正方形，与原图比例一致，避免裁切 */
    margin-top: 8px;
  }
  .hero-slides .hero-bg {
    position: absolute;
    inset: 0;
    background-size: contain !important;
    background-position: center;
  }
  /* 渐变遮罩只在图片区做，且变淡，避免盖住轮毂 */
  .hero-bg::after {
    background: linear-gradient(180deg, rgba(10,10,11,0.0) 0%, rgba(10,10,11,0.25) 100%);
  }
  .hero-bg::before { display: none; }
  /* 标题内容区在上，独立占位，不与图重叠 */
  .hero-content {
    order: 1;
    padding: 28px 0 4px;
  }
  .hero-eyebrow {
    font-size: 12px;
    margin-bottom: 16px;
  }
  .hero h1 {
    font-size: clamp(44px, 14vw, 60px);
    line-height: 0.98;
    margin-bottom: 14px;
  }
  .hero p.lead {
    font-size: 14px;
    line-height: 1.5;
    margin-bottom: 18px;
  }
  /* 按钮横排、不换行、缩小 */
  .hero-actions {
    gap: 10px;
    flex-wrap: nowrap;
  }
  .hero-actions .btn {
    padding: 12px 16px;
    font-size: 13px;
    flex: 1;
    justify-content: center;
    white-space: nowrap;
  }
  /* 数据条 2×2 紧凑 */
  .hero-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px 12px;
    margin-top: 22px;
  }
  .hero-stat .num { font-size: 26px; }
  .hero-stat .label { font-size: 11px; }
  /* 底部行动区：移动端改为垂直堆叠（徽章在上，社媒图标在下居中） */
  .footer-actions {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }
  .store-badge { width: 100%; justify-content: center; }
}

/* ============================================================
   滚动入场动画（fadeInUp）+ 数据 count-up
   渐进增强：无 JS 时元素保持默认可见；有 JS 时才附加动画类
   ============================================================ */

/* 基础：默认可见（无 JS 或 JS 失败时不遮挡内容） */
.reveal {
  opacity: 1;
  transform: none;
}

/* 仅当 JS 注入了 .anim-ready 时才启用入场动画 */
.anim-ready .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}

.anim-ready .reveal.reveal-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 交错延迟：同一区块内相邻卡片依次浮现，制造层次感 */
.anim-ready .reveal[data-delay="1"] { transition-delay: 0.08s; }
.anim-ready .reveal[data-delay="2"] { transition-delay: 0.16s; }
.anim-ready .reveal[data-delay="3"] { transition-delay: 0.24s; }
.anim-ready .reveal[data-delay="4"] { transition-delay: 0.32s; }
.anim-ready .reveal[data-delay="5"] { transition-delay: 0.40s; }

/* 尊重「减少动态效果」系统设置：直接关掉所有动画 */
@media (prefers-reduced-motion: reduce) {
  .anim-ready .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ============================================================
   高级动效层（渐进增强，不破坏原有 reveal/count-up/hover 换图）
   1. 平滑锚点滚动  2. hero 背景视差  3. 制造流程逐格点亮
   4. 系列卡片 3D tilt  5. hero 标题逐字浮现
   ============================================================ */

/* ---------- 1. 平滑锚点滚动 ---------- */
html {
  scroll-behavior: smooth;
}

/* ---------- 2. hero 背景视差 ---------- */
/* 背景层额外向上下多留 12% 空间，供 JS 随滚动 translateY 产生视差 */
.hero-slides .hero-bg {
  will-change: transform;
  transform: translateY(0);
}
/* 视差通过 JS 直接写 transform（不经 CSS 动画，保证与轮播 opacity 过渡不冲突） */

/* ---------- 3. 制造流程逐格点亮 ---------- */
/* feature-item 增加「激活态」：图标数字点亮 + 上移 + 描边高亮 */
.feature-item {
  position: relative;
  transition: transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1),
              opacity 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.feature-item .icon {
  display: inline-block;
  transition: color 0.5s ease, transform 0.5s ease, text-shadow 0.5s ease;
}
/* 未激活态（默认，配合 JS 逐格点亮） */
.anim-ready .craft-step {
  opacity: 0.35;
  transform: translateY(14px);
}
.anim-ready .craft-step.is-lit {
  opacity: 1;
  transform: translateY(0);
}
.anim-ready .craft-step.is-lit .icon {
  color: var(--accent);
  transform: scale(1.12);
  text-shadow: 0 0 22px rgba(212, 43, 30, 0.55);
}
/* 激活时 h4 也轻微提亮 */
.craft-step h4 {
  transition: color 0.5s ease;
}
.anim-ready .craft-step.is-lit h4 {
  color: var(--accent);
}

/* ---------- 4. 系列卡片 3D tilt ---------- */
/* 需要 perspective 容器营造 3D 纵深 */
.series-grid {
  perspective: 1000px;
}
.series-card {
  transform-style: preserve-3d;
  will-change: transform;
  /* 保留原有 translateY(-5px) 的 hover，3D tilt 由 JS 直接写 transform 覆盖 */
}
/* 3D tilt 阴影（随倾斜动态出现） */
.series-card .tilt-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  background: radial-gradient(ellipse at var(--mx, 50%) var(--my, 50%),
              rgba(212, 43, 30, 0.14) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.35s ease;
  z-index: 1;
}
.series-card:hover .tilt-glow {
  opacity: 1;
}
/* 3D tilt 时让文字层浮起，增强立体感 */
.series-card .name {
  transform: translateZ(30px);
  transition: transform 0.4s ease;
}
.series-card .letter {
  transform: translateZ(10px);
}

/* ---------- 5. hero 标题逐字浮现 ---------- */
/* 默认可见（无 JS 降级），JS 注入 .anim-ready 后按字符 staggered 浮现 */
.hero-eyebrow .char,
.hero h1 .line {
  opacity: 1;
  transform: none;
}
.anim-ready .hero-eyebrow .char,
.anim-ready .hero h1 .line {
  opacity: 0;
  transform: translateY(0.6em);
  display: inline-block;
  animation: heroReveal 0.9s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
  will-change: opacity, transform;
}
.anim-ready .hero-eyebrow .char {
  animation-name: heroRevealFade;
  animation-duration: 0.6s;
}
@keyframes heroReveal {
  to { opacity: 1; transform: translateY(0); }
}
@keyframes heroRevealFade {
  to { opacity: 1; transform: translateY(0); }
}
/* 交错：由 JS 内联 animation-delay，这里只定义兜底 */
.anim-ready .hero h1 .line:nth-child(1) { animation-delay: 0.05s; }
.anim-ready .hero h1 .line:nth-child(2) { animation-delay: 0.22s; }

/* ---------- 统一降级：减少动态效果时全关 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .anim-ready .craft-step { opacity: 1 !important; transform: none !important; }
  .anim-ready .hero-eyebrow .char,
  .anim-ready .hero h1 .line { opacity: 1 !important; transform: none !important; animation: none !important; }
  .series-card { transform: none !important; }
}

/* ---------- 法律页 / footer 法律链接 ---------- */
.legal-page { padding: 130px 0 70px; }
.legal-page h1 { font-family: 'Barlow Condensed', sans-serif; font-size: 2.6rem; font-weight: 700; margin-bottom: 6px; letter-spacing: .5px; }
.legal-page .legal-updated { color: var(--text-2); font-size: .9rem; margin-bottom: 28px; }
.legal-page h2 { font-family: 'Barlow Condensed', sans-serif; font-size: 1.45rem; font-weight: 600; margin: 30px 0 10px; }
.legal-page p { color: var(--text-1); line-height: 1.75; margin-bottom: 14px; max-width: 820px; }
.legal-page ul { margin: 0 0 14px 22px; max-width: 800px; }
.legal-page li { color: var(--text-1); line-height: 1.7; margin-bottom: 8px; }
.legal-page a { color: var(--accent); }
.legal-page a:hover { text-decoration: underline; }

.footer-legal-links { font-size: .85rem; }
.footer-legal-links a { color: var(--text-2); transition: color .2s; }
.footer-legal-links a:hover { color: var(--accent); }