/**
 * style.css
 * 工业耐磨陶瓷外贸落地页 — 全局样式
 * 配色：深海蓝 #0f2044 · 浅灰 · 纯白
 * 布局：固定顶部Header + 固定左侧Sidebar + 主内容区
 */

/* ═══════════════════════════════════════════
   CSS 自定义变量 (Design Tokens)
══════════════════════════════════════════ */
:root {
  --c-navy:       #0a3470;
  --c-accent:     #d97706;
  --c-wechat:     #07C160;

  --bg-base:    #f8fafc;
  --bg-alt:     #f1f5f9;
  --bg-card:    #ffffff;
  --bg-surface: #f0f4f8;

  --t-primary:   #0f172a;
  --t-secondary: #334155;
  --t-muted:     #64748b;
  --t-white:     #ffffff;

  --border:       rgba(15, 23, 42, 0.08);
  --border-blue:  rgba(26, 86, 219, 0.25);

  --shadow-card:  0 2px 16px rgba(15,23,42,0.07), 0 1px 4px rgba(15,23,42,0.05);
  --shadow-hover: 0 8px 32px rgba(15,23,42,0.12);

  --transition: 0.2s ease;
  --gap: 16px;
  --section-py: 3%;

  --sidebar-width: 162px;
  --header-height: 56px;
}

/* ═══════════════════════════════════════════
   Reset & Base
══════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0;}

html { scroll-behavior: smooth; font-size: 16px; scroll-padding-top: var(--header-height); }

body {
  font-family: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-base);
  color: var(--t-primary);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }
table { width: 100%; border-collapse: collapse; }
td, th { border: 1px solid #ddd; padding: 8px; }
th { background-color: #f5f5f5; font-weight: 600; }
tr:nth-child(even) { background-color: #f9f9f9; }
button { cursor: pointer; border: none; background: none; font: inherit; }
ul, ol { list-style: none; }

/* ═══════════════════════════════════════════
   顶部固定 Header
══════════════════════════════════════════ */
.top-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
}

.top-header__left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.top-header__logo-img {
  height: 38px;
  width: auto;
  display: block;
}

.top-header__slogan {
  font-size: 13px;
  color: var(--t-muted);
  line-height: 1.2;
  font-style: italic;
  border-left: 1px solid var(--border);
  padding-left: 14px;
}

.top-header__right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.top-header__contact {
  display: flex;
  align-items: center;
  gap: 16px;
}

.top-header__contact-item {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.top-header__contact-label {
  font-size: 9px;
  font-weight: 600;
  color: var(--t-muted);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.top-header__contact-value {
  font-size: 15px;
  font-weight: 500;
  color: var(--c-navy);
  transition: color var(--transition);
}
.top-header__contact-value:hover { color: #0b1836; }

.top-header__divider {
  width: 1px; height: 28px;
  background: var(--border);
}

.top-header__lang {
  display: flex;
  align-items: center;
  gap: 2px;
}

.top-header__lang-btn {
  padding: 3px 7px;
  font-size: 10px;
  font-weight: 600;
  color: var(--t-muted);
  border-radius: 3px;
  transition: background var(--transition), color var(--transition);
}
.top-header__lang-btn.active,
.top-header__lang-btn:hover {
  background: var(--c-navy);
  color: #fff;
}

/* ═══════════════════════════════════════════
   左侧固定 Sidebar
══════════════════════════════════════════ */
.left-sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0; bottom: 0;
  width: var(--sidebar-width);
  z-index: 800;
  background: #ffffff;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 0;
}

.left-sidebar__brand {
  width: 100%;
  padding: 0 0 16px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.left-sidebar__since {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-navy);
  letter-spacing: 2px;
}

.left-sidebar__nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex: 1;
  width: 100%;
  padding: 12px;
}

/* Products Sub-nav (独立于左侧导航) */
.products-subnav {
  position: fixed;
  top: var(--header-height);
  left: var(--sidebar-width);
  bottom: 0;
  width: 220px;
  background: #f8f9fa;
  border-right: 1px solid var(--border);
  z-index: 700;
  overflow-y: auto;
}

.products-subnav__nav {
  display: flex;
  flex-direction: column;
  padding: 8px 0;
}

.products-subnav__item {
  border-bottom: 1px solid rgba(15,32,68,0.08);
}

.products-subnav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 16px;
  font-size: 11px;
  font-weight: 600;
  color: rgba(15,32,68,0.6);
  text-align: left;
  text-decoration: none;
  text-transform: uppercase;
  border-left: 3px solid transparent;
  transition: all var(--transition);
  line-height: 1.6;
  cursor: pointer;
}

.products-subnav__link span:first-child {
  flex: 1;
  padding-right: 8px;
}

.products-subnav__arrow {
  font-size: 10px;
  transition: transform var(--transition);
  flex-shrink: 0;
}

.products-subnav__item.is-open > .products-subnav__link .products-subnav__arrow {
  transform: rotate(180deg);
}

.products-subnav__link.no-sub .products-subnav__arrow {
  display: none;
}

.products-subnav__link:hover,
.products-subnav__item:hover > .products-subnav__link {
  color: var(--c-navy);
  background: rgba(15,32,68,0.05);
  border-left-color: var(--c-navy);
}

.products-subnav__item.is-open > .products-subnav__link {
  color: var(--c-navy);
  background: rgba(15,32,68,0.08);
  border-left-color: var(--c-navy);
}

.products-subnav__link.active {
  color: var(--c-navy);
  background: rgba(15,32,68,0.12);
  border-left-color: var(--c-navy);
  font-weight: 700;
}

/* Sub-menu (三级子菜单) */
.products-subnav__sub {
  margin: 0;
  padding: 0;
  list-style: none;
  max-height: 0;
  overflow: hidden;
  background: rgba(255,255,255,0.7);
}

.products-subnav__item.is-open > .products-subnav__sub {
  max-height: 500px;
  padding: 6px 0;
}

.products-subnav__sublink {
  display: block;
  padding: 8px 16px 8px 36px;
  font-size: 11px;
  font-weight: 400;
  color: rgba(15,32,68,0.55);
  text-decoration: none;
  position: relative;
  transition: all var(--transition);
  line-height: 1.3;
}

.products-subnav__sublink::before {
  content: '';
  position: absolute;
  left: 22px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(15,32,68,0.3);
  transition: background var(--transition);
}

.products-subnav__sublink:hover,
.products-subnav__sublink.active {
  color: var(--c-navy);
  background: rgba(15,32,68,0.04);
  padding-left: 40px;
}

.products-subnav__sublink:hover::before,
.products-subnav__sublink.active::before {
  background: var(--c-navy);
}

.left-sidebar__nav-item {
  display: block;
  width: 100%;
  padding: 8px 0;
  text-align: center;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.8px;
  color: var(--t-muted);
  border-radius: 6px;
  transition: background var(--transition), color var(--transition);
}
.left-sidebar__nav-item:hover { background: var(--bg-surface); color: var(--c-navy); }
.left-sidebar__nav-item.active { background: var(--c-navy); color: #fff; }

/* 侧边栏 <a> 链接样式（首页 + 子页面通用） */
.left-sidebar__nav-link {
  display: block;
  width: 100%;
  padding: 10px 24px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0;
  color: rgba(15,32,68,0.6);
  text-align: left;
  transition: color 0.2s ease, background 0.2s ease;
  border-left: 3px solid transparent;
  text-transform: uppercase;
  text-decoration: none;
}
.left-sidebar__nav-link:hover {
  color: var(--c-navy);
  background: rgba(15,32,68,0.06);
}
.left-sidebar__nav-link.active {
  color: var(--c-navy);
  background: rgba(15,32,68,0.10);
  border-left-color: var(--c-navy);
}

.left-sidebar__qr {
  padding: 12px;
  width: 100%;
  display: flex;
  justify-content: center;
}

.left-sidebar__qr-box {
  position: relative;
  width: 72px; height: 72px;
  background: var(--c-wechat);
  border-radius: 6px;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.left-sidebar__qr-code { width: 64px; height: 64px; }
.left-sidebar__qr-code svg { width: 100%; height: 100%; }

.left-sidebar__qr-icon {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  width: 20px; height: 20px;
  background: #fff;
  border-radius: 4px;
  padding: 2px;
}
.left-sidebar__qr-icon svg { width: 100%; height: 100%; }

/* ── 移动端汉堡按钮（桌面端隐藏） ── */
.top-header__menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 32px;
  height: 32px;
  padding: 6px 4px;
  z-index: 1000;
}
.top-header__menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--t-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}
.top-header__menu-btn.open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.top-header__menu-btn.open span:nth-child(2) {
  opacity: 0;
}
.top-header__menu-btn.open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ── 侧边栏遮罩（移动端） ── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 799;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.sidebar-overlay.visible {
  display: block;
  opacity: 1;
}

/* ═══════════════════════════════════════════
   主内容区
══════════════════════════════════════════ */
.main-content {
  margin-left: var(--sidebar-width);
  padding-top: var(--header-height);
}

/* 主内容区 - 当产品二级导航存在时 */
.main-content.has-products-subnav {
  margin-left: calc(var(--sidebar-width) + 220px);
}

.container {
  width: 90%;
  margin: 0 auto;
  padding: 0;
}

.section-py {
  padding-top: var(--section-py);
  padding-bottom: var(--section-py);
}

/* ═══════════════════════════════════════════
   Hero Banner — 参考图风格
   全屏背景 + 左侧浅灰遮罩 + 产品图居中 + 底部功能条
══════════════════════════════════════════ */
.hero-section {
  position: relative;
  width: 100%;
  /* 高度 = 视口 - header - usp bar */
  height: calc(100vh - var(--header-height));
  min-height: 560px;
  overflow: hidden;
}

/* ── 轮播容器 ── */
.hero-slides {
  position: relative;
  width: 100%;
  height: 100%;
}

/* ── 每张幻灯片 ── */
.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
  pointer-events: none;
  overflow: hidden;
}
.hero-slide.active {
  opacity: 1;
  pointer-events: auto;
}

/* ── 全屏背景图（img 标签） ── */
.hero-slide picture {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ── 全屏背景视频 ── */
.hero-bg-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

/* ── 视频遮罩层 ── */
.hero-slide__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(15, 32, 68, 0.5) 0%,
    rgba(26, 86, 219, 0.2) 50%,
    transparent 100%
  );
  z-index: 1;
  pointer-events: none;
}

/* Ken Burns 缩放动效：active 幻灯片的背景图轻微放大 */
.hero-slide.active .hero-bg {
  transform: scale(1.06);
  transition: transform 8s ease;
}
.hero-slide:not(.active) .hero-bg {
  transform: scale(1);
  transition: none;
}

/* ── 左侧文字内容区（占满宽度） ── */
.hero-content {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 100%;
  z-index: 3;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px 10% 100px 10%;
}

/* ── 轮播切换功能条（蓝底参考图样式） ── */
.hero-indicators-bar {
  position: absolute;
  bottom: 13%;
  left: 10%;
  right: 10%;
  z-index: 20;
  background: #0b1836;
  display: flex;
  align-items: stretch;
  padding: 16px 24px;
  gap: 0;
}

.hero-indicators-item {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 20px;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity 0.3s ease;
}
.hero-indicators-item.active {
  opacity: 1;
}
.hero-indicators-item:hover {
  opacity: 0.85;
}

.hero-indicators-num {
  font-size: 26px;
  font-weight: 900;
  color: #fff;
  line-height: 1;
  flex-shrink: 0;
}

.hero-indicators-text {
  font-size: 12px;
  color: rgba(255,255,255,0.88);
  line-height: 1.55;
  flex: 1;
}

.hero-indicators-thumb {
  width: 68px;
  height: 48px;
  flex-shrink: 0;
  border-radius: 4px;
  overflow: hidden;
}
.hero-indicators-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-indicators-divider {
  width: 1px;
  align-self: stretch;
  background: rgba(255,255,255,0.25);
  flex-shrink: 0;
}

/* ── 响应式 ── */
@media (max-width: 1024px) {
  .hero-content {
    padding: 40px 5% 100px 5%;
  }
}

@media (max-width: 768px) {
  .hero-content {
    padding: 32px 5% 80px 5%;
  }
  .hero-indicators-bar {
    left: 5%;
    right: 5%;
    flex-direction: column;
    padding: 12px 16px;
    gap: 12px;
  }
  .hero-indicators-divider { display: none; }
  .hero-indicators-item {
    padding: 0;
  }
  .hero-indicators-thumb { display: none; }
}

/* ═══════════════════════════════════════════
   通用区块标题
══════════════════════════════════════════ */
.section-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--c-navy);
  background: rgba(15,32,68,0.08);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 800;
  color: var(--t-primary);
  letter-spacing: -0.8px;
  line-height: 1.2;
  margin-bottom: 14px;
}
.section-title span { color: var(--c-navy); }

.section-desc {
  font-size: 16px;
  color: var(--t-muted);
  line-height: 1.75;
  max-width: 600px;
}

.section-header { text-align: center; margin-bottom: 56px; }
.section-header .section-desc { margin: 0 auto; }

/* ═══════════════════════════════════════════
   About 品牌简介
══════════════════════════════════════════ */
.about-section { background: var(--bg-alt); }

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

/* ── 左侧：粘性固定（sticky），右侧滚动到底后一起移动 ── */
.about-intro-left {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  align-self: start;
}

.about-intro-left .section-desc {
  margin-bottom: 32px;
}

.industry-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.industry-tag {
  display: inline-flex;
  padding: 10px 20px;
  background-color: rgba(10, 52, 112, 0.08);
  border: 1px solid #0a3470;
  border-radius: 8px;
  font-size: 14px;
  color: #0a3470;
  line-height: 1.5;
}

@media (max-width: 768px) {
  .industry-tags {
    gap: 8px;
  }
  .industry-tag {
    padding: 8px 14px;
    font-size: 12px;
    border-radius: 6px;
  }
}

@media (max-width: 480px) {
  .industry-tags {
    gap: 6px;
    margin-bottom: 16px;
  }
  .industry-tag {
    padding: 6px 10px;
    font-size: 11px;
    border-radius: 4px;
  }
}

.about-advantages {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.about-advantage-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.about-advantage-icon {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-navy);
  line-height: 1.4;
  flex-shrink: 0;
}

.about-advantage-item strong {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--t-primary);
  margin-bottom: 4px;
}

.about-advantage-item p {
  font-size: 12px;
  color: var(--t-muted);
  line-height: 1.55;
}

/* ── 右侧：产品分类卡片列表（卡片叠加效果容器） ── */
.about-products-right {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ── 卡片基础样式 ── */
.about-product-card {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  height: 300px;
  flex-shrink: 0;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition);
}
.about-product-card:hover {
  box-shadow: var(--shadow-hover);
}

/* ── sticky 叠加卡片：每张 top 递增 20px，层叠压住上一张 ── */
.about-product-card--sticky {
  position: sticky;
  /* top = header高度 + 左侧sticky偏移 + 卡片序号×20px */
  top: calc(var(--header-height) + 24px + var(--card-index, 0) * 20px);
  z-index: calc(10 + var(--card-index, 0));
  /* 收窄动画：通过 width + margin 实现，JS 动态设置 --card-width / --card-ml */
  width: var(--card-width, 100%);
  margin-left: var(--card-ml, 0%);
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1), margin-left 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease;
}

.about-product-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.85);
  transition: transform 0.5s ease;
}
.about-product-card:hover img {
  transform: scale(1.05);
}

.about-product-card__info {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 20px 24px;
  z-index: 2;
  background: linear-gradient(90deg, rgba(15,32,68,0.88) 0%, rgba(15,32,68,0.55) 55%, transparent 100%);
}

.about-product-card__tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: rgba(255,255,255,0.85);
  background: rgba(255,255,255,0.18);
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 8px;
  width: fit-content;
}

.about-product-card__info h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
  letter-spacing: -0.3px;
}

.about-product-card__info p {
  font-size: 12px;
  color: rgba(255,255,255,0.78);
  line-height: 1.5;
}

.about-product-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.about-product-card__link {
  font-size: 11px;
  color: rgba(255,255,255,0.75);
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 100px;
  padding: 2px 12px;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}
.about-product-card__link:hover {
  background: rgba(255,255,255,0.28);
  color: #fff;
}

/* ═══════════════════════════════════════════
   About FIRSTAR 公司介绍
══════════════════════════════════════════ */
.about-firstar-section {
  background: var(--bg-base);
  position: relative; /* 为覆盖层提供定位父级 */
  overflow: hidden;
}

/* COMPANY INTRODUCTION — logo 装饰已移至 .about-firstar-stats */

/* ── FIRSTAR 滚动驱动动效 ── */

/* 外层 wrapper：提供滚动轨道高度 */
.firstar-scroll-wrapper {
  position: relative;
  min-height: 150vh;
  overflow: visible;
}

/* fixed，由 JS 控制显示时机（Business Model 底部离开 100px 时触发） */
.firstar-sticky-stage {
  position: fixed;
  top: 0;
  left: var(--sidebar-width);
  width: calc(100% - var(--sidebar-width));
  height: 100vh;
  display: flex;
  align-items: flex-end;     /* 文字从底部开始显示 */
  justify-content: center;
  padding-bottom: 80px;       /* 距视口底部的间距 */
  z-index: 60;
  pointer-events: none;
  visibility: hidden;
  overflow: hidden;           /* 放大时裁切超出部分 */
}

/* 大号 FIRSTAR 文字（独立显示，无背景遮挡） */
.firstar-scroll-word {
  position: relative;
  z-index: 1;
  display: block;
  font-size: clamp(60px, 14vw, 180px);
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--c-navy);
  line-height: 1;
  white-space: nowrap;
  transform-origin: center bottom; /* 放大从底部向上扩展 */
  will-change: transform, opacity;
}

/* 占位 div：内容 fixed 时撑开空间 */
.firstar-content-spacer {
  height: 0;
  overflow: hidden;
  transition: none;
}

/* 内容区：初始不可见，由 JS 控制淡入 */
.firstar-content-reveal {
  opacity: 0;
  position: relative;
  z-index: 55;
  will-change: opacity;
  transition: none;
}

/* JS 激活时：固定在屏幕中央，无滚动条 */
.firstar-content-reveal.content-fixed {
  position: fixed;
  top: 50%;
  left: var(--sidebar-width);
  width: calc(100% - var(--sidebar-width));
  transform: translateY(-50%);
  margin-top: 0;
  z-index: 55;
  overflow: hidden;
}

/* 动效结束后恢复正常流 */
.firstar-content-reveal.content-flow {
  position: relative;
  top: auto;
  left: auto;
  width: 100%;
  transform: none;
  margin-top: 0;
  opacity: 1;
  z-index: auto;
}

/* 上半：左右并排 */
.about-firstar-top {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 56px;
  align-items: start;
  margin-bottom: 56px;
  position: relative;
  z-index: 1;
}

/* ── 左侧蓝色统计块 ── */
.about-firstar-stats {
  position: relative;
  background: var(--c-navy);
  border-radius: 4px 4px 0 0;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

/* logo 装饰：靠右侧只显示半张图 */
.about-firstar-stats::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -60%;              /* 向右偏移图片宽度的一半 */
  transform: translateY(-50%);
  width: 120%;
  aspect-ratio: 1 / 1;
  background: url('/img/logo-d.webp') no-repeat center center / contain;
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}

.about-firstar-stats__label-top {
  position: relative;
  z-index: 1;
  padding: 24px 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.about-firstar-stats__tag {
  display: block;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 2px;
  color: #fff;
  line-height: 1.15;
}

.about-firstar-stats__tag--gold {
  color: #d97706;
}

.about-firstar-stats__list {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
}

.about-firstar-stats__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  border-top: 1px solid rgba(255,255,255,0.08);
  gap: 12px;
  transition: background 0.2s ease;
}
.about-firstar-stats__item:hover {
  background: rgba(255,255,255,0.05);
}

.about-firstar-stats__key {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  font-weight: 500;
  flex-shrink: 0;
}

.about-firstar-stats__val {
  font-size: 32px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -1px;
  line-height: 1;
  white-space: nowrap;
}

.about-firstar-stats__val em {
  font-style: normal;
  font-size: 22px;
  color: var(--c-accent);
  font-weight: 800;
}

/* ── 右侧介绍文字 ── */
.about-firstar-intro {
  padding-top: 8px;
}

.about-firstar-intro__eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--c-navy);
  background: rgba(15,32,68,0.08);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 18px;
}

.about-firstar-intro__title {
  font-size: clamp(22px, 2.8vw, 34px);
  font-weight: 800;
  color: var(--t-primary);
  letter-spacing: -0.6px;
  line-height: 1.25;
  margin-bottom: 20px;
}
.about-firstar-intro__title span {
  color: var(--c-navy);
}

.about-firstar-intro__desc {
  font-size: 15px;
  color: var(--t-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
}

.about-firstar-intro__desc-en {
  font-size: 13px;
  color: var(--t-muted);
  line-height: 1.75;
  margin-bottom: 24px;
  font-style: italic;
}

.about-firstar-intro__certs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.about-firstar-intro__cert {
  display: inline-block;
  padding: 5px 14px;
  border: 1.5px solid var(--border-blue);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-navy);
  background: rgba(15,32,68,0.05);
  letter-spacing: 0.3px;
}

/* ── 下半：厂房横幅图 ── */
.about-firstar-banner {
  position: relative;
  z-index: 1;
  height: 320px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.about-firstar-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  filter: brightness(0.75) saturate(0.85);
  transition: transform 0.6s ease;
}
.about-firstar-banner:hover img {
  transform: scale(1.03);
}

.about-firstar-banner__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(15, 32, 68, 0.55) 0%,
    rgba(26, 86, 219, 0.20) 50%,
    transparent 100%
  );
  pointer-events: none;
  z-index: 4;
}

/* 播放按钮：垂直水平居中（使用自定义图片） */
.about-firstar-banner__play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  height: 50%;
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: transform 0.25s ease;
  z-index: 5;
}

.about-firstar-banner__play img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.about-firstar-banner__play:hover {
  transform: translate(-50%, -50%) scale(1.08);
}

.about-firstar-banner__watermark {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  font-size: clamp(64px, 10vw, 140px);
  font-weight: 900;
  letter-spacing: 8px;
  color: rgba(255,255,255,0.10);
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
  line-height: 1;
}

/* ═══════════════════════════════════════════
   一站式商业模式
══════════════════════════════════════════ */
.business-model-section {
  background: var(--bg-base);
  overflow: hidden;
  padding-bottom: 0;
}

/* 轮播容器 */
.business-model-carousel {
  position: relative;
  margin-bottom: 64px;
}

/* 左右箭头按钮 */
.business-model-carousel__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  box-shadow: 0 2px 12px rgba(15,23,42,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--t-primary);
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}
.business-model-carousel__arrow:hover {
  background: #fff;
  box-shadow: 0 4px 20px rgba(15,23,42,0.22);
}
.business-model-carousel__arrow:active {
  transform: translateY(-50%) scale(0.92);
}
.business-model-carousel__arrow svg {
  width: 20px;
  height: 20px;
}
.business-model-carousel__arrow--prev { left: -22px; }
.business-model-carousel__arrow--next { right: -22px; }

/* 滚动视窗 */
.business-model-carousel__track-wrap {
  overflow: hidden;
  border-radius: 20px;
}

/* 滚动轨道（flex 容器） */
.business-model-carousel__track {
  display: flex;
  gap: 20px;
  transition: transform 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
  will-change: transform;
}

/* 单张卡片 */
.business-model-carousel__card {
  flex: 0 0 calc((100% - 40px) / 3);
  border-radius: 20px;
  overflow: hidden;
  height: 240px;
  position: relative;
  box-shadow: var(--shadow-card);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.business-model-carousel__card:hover {
  box-shadow: var(--shadow-hover);
}

.business-model-carousel__card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.business-model-carousel__card:hover img {
  transform: scale(1.05);
}

/* 底部遮罩 + 标题 */
.business-model-carousel__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  padding: 20px 24px;
  background: linear-gradient(to top, rgba(15,32,68,0.8) 0%, rgba(15,32,68,0.3) 60%, transparent 100%);
}
.business-model-carousel__overlay h3 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.2px;
  text-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

/* 蓝色背景区域（右上角圆角） */
.business-model-blue-area {
  background: var(--c-navy);
  border-radius: 0 80px 0 0;
  padding: 64px 0 80px;
  position: relative;
}

/* 步骤卡片网格 */
.business-model-steps-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 32px;
}

.business-step-card {
  text-align: center;
}

.business-step-card__icon {
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: #fff;
  backdrop-filter: blur(4px);
  transition: background 0.2s ease, transform 0.2s ease;
}

.business-step-card:hover .business-step-card__icon {
  background: rgba(255,255,255,0.25);
  transform: translateY(-2px);
}

.business-step-card__icon svg {
  width: 26px;
  height: 26px;
}

.business-step-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  letter-spacing: -0.2px;
}

.business-step-card p {
  font-size: 13px;
  color: rgba(255,255,255,0.75);
  line-height: 1.65;
}

.products-section { background: var(--bg-base); }

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-blue);
}

.product-card__img-wrapper {
  position: relative;
  height: 200px;
  overflow: hidden;
  background: #1e293b;
}

.product-card__img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  filter: brightness(0.85) saturate(0.8);
}
.product-card:hover .product-card__img { transform: scale(1.05); }

.product-card__tag {
  position: absolute;
  top: 12px; right: 12px;
  background: var(--c-navy);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 100px;
}

.product-card__body { padding: 24px; }

.product-card__grade {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--c-navy);
  background: rgba(15,32,68,0.08);
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 10px;
}

.product-card__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--t-primary);
  margin-bottom: 8px;
  line-height: 1.35;
}

.product-card__desc {
  font-size: 13px;
  color: var(--t-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.product-card__specs { display: flex; flex-direction: column; gap: 6px; }

.product-card__spec-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--t-secondary);
}
.product-card__spec-item::before {
  content: '';
  width: 5px; height: 5px;
  background: var(--c-navy);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════
   技术参数对比表格
══════════════════════════════════════════ */
.specs-section { background: var(--bg-alt); }

.specs-table-wrapper {
  overflow-x: auto;
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

.specs-table thead tr {
  background: linear-gradient(135deg, #0f2044 0%, #0f2044 100%);
}

.specs-table thead th {
  padding: 18px 24px;
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
}
.specs-table thead th.th-92 { color: rgba(255,255,255,0.5); text-align: center; }
.specs-table thead th.th-99 { color: #fde68a; text-align: center; }

.specs-table tbody tr {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.specs-table tbody tr:last-child { border-bottom: none; }
.specs-table tbody tr:hover { background: #f0f7ff; }
.specs-table tbody tr.row-hi { background: #fffbeb; }
.specs-table tbody tr.row-hi:hover { background: #fef3c7; }

.specs-table td { padding: 16px 24px; font-size: 14px; color: var(--t-secondary); }
.td-param { font-weight: 600; color: var(--t-primary); font-size: 15px; }
.td-unit { font-size: 12px; color: var(--t-muted); font-style: italic; }
.td-val { text-align: center; font-weight: 700; font-size: 15px; }
.td-val-92 { color: #0f2044; }
.td-val-99 { color: #b45309; }

/* ═══════════════════════════════════════════
   工厂实力
══════════════════════════════════════════ */
.factory-section { background: var(--bg-base); }

.factory-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
  margin-bottom: 40px;
}

.factory-card {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.factory-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }

.factory-card__img-wrapper { height: 220px; overflow: hidden; background: #1e293b; }
.factory-card__img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  filter: brightness(0.88) saturate(0.8);
}
.factory-card:hover .factory-card__img { transform: scale(1.04); }

.factory-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15,23,42,0.72) 0%, transparent 55%);
}

.factory-card__caption {
  position: absolute;
  bottom: 16px; left: 20px; right: 20px;
}
.factory-card__title { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 4px; }
.factory-card__desc { font-size: 12px; color: rgba(255,255,255,0.78); line-height: 1.55; }

/* ═══════════════════════════════════════════
   MOQ & 合作政策
══════════════════════════════════════════ */
.moq-section { background: var(--bg-alt); }

.moq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
}

.moq-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.moq-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: var(--border-blue); }

.moq-card__icon { font-size: 28px; margin-bottom: 14px; }
.moq-card__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--t-primary);
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.moq-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 8px;
  align-items: baseline;
  margin-bottom: 12px;
}
.moq-row__key {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--t-muted);
}
.moq-row__val { font-size: 14px; color: var(--t-secondary); font-weight: 500; }
.moq-row__val strong { color: var(--c-navy); font-weight: 700; }

/* ═══════════════════════════════════════════
   NEWS 新闻动态
══════════════════════════════════════════ */
.news-section { background: var(--bg-base); }

.news-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: stretch;
}

/* ── 左侧 Featured 大图 ── */
.news-featured {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.3s ease;
  cursor: pointer;
  min-height: 280px;
  clip-path: inset(0 round 20px);
}
.news-featured:hover {
  box-shadow: var(--shadow-hover);
}
.news-featured img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
  transition: transform 0.6s ease;
}
.news-featured:hover img {
  transform: scale(1.05);
}

.news-featured__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15,23,42,0.85) 0%, rgba(15,23,42,0.3) 50%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 28px;
}
.news-featured__overlay > h3{color: white;}
.news-featured__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.news-featured__overlay > h3:hover{color: white;}

.news-featured__title {
  font-weight: 700;
  color: #fff;
  line-height: 1.4;
  letter-spacing: -0.3px;
}

.news-title-link {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}


/* ── 右侧新闻列表 ── */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.news-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  cursor: pointer;
}
.news-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-blue);
}

.news-item__main {
  flex: 1;
  min-width: 0;
}

.news-item__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.news-item__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--t-primary);
  line-height: 1.5;
  letter-spacing: -0.2px;
}

.news-item__arrow {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--t-muted);
  flex-shrink: 0;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.news-item:hover .news-item__arrow {
  background: var(--c-navy);
  color: #fff;
  border-color: var(--c-navy);
}
.news-item__arrow svg {
  width: 18px;
  height: 18px;
}

/* ── 通用新闻元素 ── */
.news-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-navy);
  flex-shrink: 0;
}

.news-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-navy);
  background: rgba(15,32,68,0.08);
  padding: 3px 10px;
  border-radius: 100px;
  flex-shrink: 0;
}

.news-date {
  font-size: 12px;
  color: var(--t-muted);
  flex-shrink: 0;
}

.news-featured__meta .news-tag {
  background: rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.9);
}
.news-featured__meta .news-date {
  color: rgba(255,255,255,0.65);
}

/* ═══════════════════════════════════════════
   联系我们 — 左右分栏
══════════════════════════════════════════ */
.contact-section { background: var(--bg-alt); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 48px;
  align-items: start;
}

.contact-left-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 36px;
  box-shadow: var(--shadow-card);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.contact-left-card__title {
  font-size: 32px;
  font-weight: 800;
  color: var(--t-primary);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.contact-left-card__subtitle {
  font-size: 14px;
  color: var(--t-muted);
  line-height: 1.7;
  margin-bottom: 28px;
}

.contact-left-card__item {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 16px;
  line-height: 1.6;
}

.contact-left-card__label {
  font-size: 15px;
  font-weight: 700;
  color: var(--t-primary);
  flex-shrink: 0;
}

.contact-left-card__value {
  font-size: 15px;
  color: var(--t-secondary);
}

.contact-left-card__value--tel {
  font-size: 22px;
  font-weight: 700;
  color: var(--t-primary);
  letter-spacing: -0.3px;
}

.contact-left-card__qrcode {
  margin-top: auto;
  padding-top: 28px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.contact-left-card__qrcode-img {
  width: 110px;
  height: 110px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
  background: #f8f9fa;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-left-card__qrcode-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.contact-left-card__qrcode-text {
  font-size: 14px;
  color: var(--t-muted);
  line-height: 1.8;
}

.contact-left-card__qrcode-text p {
  margin: 0;
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px;
  box-shadow: var(--shadow-card);
}
.contact-form__title { font-size: 20px; font-weight: 700; color: var(--t-primary); margin-bottom: 4px; }
.contact-form__sub { font-size: 13px; color: var(--t-muted); margin-bottom: 28px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  margin-bottom: var(--gap);
}

.form-group { display: flex; flex-direction: column; gap: 7px; margin-bottom: var(--gap); }
.form-group:last-of-type { margin-bottom: 0; }

.form-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--t-secondary);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.form-label em { color: #ef4444; font-style: normal; margin-left: 2px; }

.form-input, .form-select, .form-textarea {
  background: var(--bg-surface);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 11px 14px;
  font-size: 14px;
  color: var(--t-primary);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  width: 100%;
  font-family: inherit;
}
.form-input::placeholder, .form-textarea::placeholder { color: var(--t-muted); }
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--c-navy);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(15,32,68,0.10);
}
.form-select {
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='7' viewBox='0 0 12 7'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2364748b' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}
.form-textarea { resize: vertical; min-height: 110px; line-height: 1.65; }

/* 验证码样式 */
.form-group-checkcode {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.checkcode-wrapper {
  display: flex;
  gap: 12px;
  align-items: center;
  width: 100%;
}

.form-input-checkcode {
  flex: 1;
}

.checkcode-img {
  height: 44px;
  min-width: 120px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  cursor: pointer;
  transition: border-color var(--transition);
}

.checkcode-img:hover {
  border-color: var(--c-navy);
}

.btn-submit {
  width: 100%;
  padding: 14px;
  background: var(--c-navy);
  color: #fff;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  margin-top: 6px;
}
.btn-submit:hover { background: #0b1836; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(15,32,68,0.35); }
.btn-submit:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.form-success {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 24px;
  gap: 12px;
}
.form-success__icon { font-size: 48px; }
.form-success__title { font-size: 20px; font-weight: 700; color: var(--t-primary); }
.form-success__desc { font-size: 14px; color: var(--t-muted); }

/* 悬浮按钮容器：右下角上下排列 */
.whatsapp-btn {
  position: fixed;
  bottom: 96px; right: 32px;
  z-index: 700;
  width: 56px; height: 56px;
  background: #25d366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(37,211,102,0.4);
  font-size: 24px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.whatsapp-btn:hover { transform: scale(1.1); box-shadow: 0 8px 32px rgba(37,211,102,0.5); }

/* 返回顶部按钮（在 WhatsApp 按钮下方） */
.back-to-top-btn {
  position: fixed;
  bottom: 32px; right: 32px;
  z-index: 700;
  width: 56px; height: 56px;
  background: #0f2044;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background 0.2s ease;
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
}
.back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top-btn:hover {
  background: #d97706;
  border-color: #d97706;
}

/* ═══════════════════════════════════════════
   页脚
══════════════════════════════════════════ */
.footer {
  margin-left: var(--sidebar-width);
  background: var(--c-navy);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 56px 0 32px;
}

/* 当页面有二级产品菜单时，页脚增加左边距避免被遮挡 */
body.has-products-subnav .footer {
  margin-left: calc(var(--sidebar-width) + 220px);
}

body.has-products-subnav .footer .container {
  width: 100%;
  padding: 0 5%;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-logo { margin-bottom: 12px; }
.footer-logo img { height: 70px; width: auto; object-fit: contain; filter: brightness(0) invert(1); }

.footer-about { font-size: 13px; color: rgba(255,255,255,0.45); line-height: 1.75; margin-bottom: 20px; }

.footer-certs { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.footer-cert-img {
  width: 100px;
  object-fit: contain;
  background: #fff;
  border-radius: 50%;
  padding: 2px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}
.footer-cert-badge {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 11px;
  font-weight: 600;
  color: rgba(255,255,255,0.6);
}

.footer-col__title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.35);
  margin-bottom: 16px;
}

.footer-col__links { display: flex; flex-direction: column; gap: 10px; }
.footer-col__link { font-size: 13px; color: rgba(255,255,255,0.5); transition: color var(--transition); }
.footer-col__link:hover { color: rgba(255,255,255,0.85); }

.footer-social { display: flex; gap: 12px; margin-top: 20px; }
.footer-social__icon {
  width: 36px; height: 36px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: background var(--transition), transform var(--transition);
}
.footer-social__icon:hover { background: var(--c-navy); transform: translateY(-2px); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p,.footer-bottom a,.footer-bottom a:hover
 { font-size: 12px; color: rgba(255,255,255,0.28); }

/* 骨架屏 */
.img-skeleton {
  width: 100%; height: 100%;
  background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.8s infinite;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 滚动入场动画 */
.fade-in-up {
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in-up.visible { opacity: 1; transform: translateY(0); }

/* ═══════════════════════════════════════════
   响应式断点
══════════════════════════════════════════ */
/* ════════════════════════════════════════
   荣誉资质区块
═══════════════════════════════════════ */
.honors-section {
  background: var(--bg-alt);
}

.honors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.honor-badge {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-navy);
  box-shadow: 0 2px 8px rgba(15, 32, 68, 0.06);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  align-items: center;
  gap: 10px;
}

.honor-badge:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(15, 32, 68, 0.12);
}

.honor-badge--national {
  border-left: 4px solid var(--c-navy);
  background: linear-gradient(135deg, #f0f5ff 0%, #fff 100%);
}

.honor-badge--provincial {
  border-left: 4px solid #2563eb;
}

.honor-badge--municipal {
  border-left: 4px solid #60a5fa;
}

@media (max-width: 768px) {
  .honors-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .honor-badge {
    font-size: 12px;
    padding: 12px 14px;
  }
}

@media (max-width: 480px) {
  .honors-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1024px) {
  .top-header__menu-btn { display: flex; }
  .top-header__slogan { display: none; }
  .top-header__divider { display: none; }

  /* 侧边栏变为侧滑抽屉 */
  .left-sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    box-shadow: none;
    z-index: 850;
    width: 220px;
  }
  .left-sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0,0,0,0.15);
  }

  .main-content { margin-left: 0; width: 100%; }
  .footer { margin-left: 0; }

  /* ─── 移动端：二级菜单保持与桌面端一致的展示 ─── */
  /* 由于左侧导航在移动端变为抽屉（默认隐藏），二级菜单从屏幕左侧0位置开始 */
  .products-subnav {
    display: block;
    left: 0;
    width: 180px;
    z-index: 650;
  }

  /* 主内容区域需要留出二级菜单的空间 */
  .main-content.has-products-subnav {
    margin-left: 180px;
  }

  /* 页脚也需要调整 */
  body.has-products-subnav .footer {
    margin-left: 180px;
  }

  /* 移动端二级菜单样式微调 */
  .products-subnav__link {
    padding: 10px 12px;
    font-size: 10px;
  }
  .products-subnav__sublink {
    padding: 8px 12px 8px 28px;
    font-size: 10px;
  }
  .products-subnav__sublink::before {
    left: 16px;
  }
  .products-subnav__sublink:hover,
  .products-subnav__sublink.active {
    padding-left: 32px;
  }
  .firstar-sticky-stage { left: 0; width: 100%; }
  .firstar-content-reveal.content-fixed { left: 0; width: 100%; }
  .about-layout { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-intro-left { position: static; }           /* 单列时取消 sticky */
  .about-product-card--sticky { position: relative; top: auto; width: 100% !important; margin-left: 0 !important; } /* 移动端取消叠加，强制宽度100% */
  .about-firstar-top { grid-template-columns: 260px 1fr; gap: 36px; }
  .factory-grid { grid-template-columns: repeat(2, 1fr); }
  .news-layout { grid-template-columns: 1fr; }
  .news-featured { min-height: 300px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .business-model-steps-grid { grid-template-columns: repeat(3, 1fr); }
  .business-model-blue-area { border-radius: 0 60px 0 0; }
  .business-model-carousel__arrow--prev { left: 8px; }
  .business-model-carousel__arrow--next { right: 8px; }
  .business-model-carousel__card { flex: 0 0 calc((100% - 20px) / 2); }
}

@media (max-width: 768px) {
  :root { --section-py: 64px; }
  .top-header__contact { display: none; }

  /* ─── 768px以下：二级菜单更紧凑 ─── */
  .products-subnav { width: 160px; }
  .main-content.has-products-subnav { margin-left: 160px; }
  body.has-products-subnav .footer { margin-left: 160px; }
  .moq-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer { margin-left: 0; }
  .about-advantages { grid-template-columns: 1fr 1fr; }
  .about-product-card { height: 155px; }
  .about-firstar-top { grid-template-columns: 1fr; gap: 32px; }
  .about-firstar-stats { max-width: 100%; }
  .about-firstar-banner { height: 220px; }
  .business-model-carousel__card { flex: 0 0 calc((100% - 20px) / 2); height: 200px; }
  .business-model-blue-area { border-radius: 0 40px 0 0; padding: 48px 0 56px; }
  .business-model-steps-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  /* NEWS responsive */
  .news-featured { min-height: 260px; border-radius: 16px; }
  .news-featured__overlay { padding: 20px; }
  .news-featured__title { font-size: 17px; }
  .news-item { padding: 18px 20px; }
  .news-item__title { font-size: 14px; }
  .news-item__arrow { width: 38px; height: 38px; }
  /* Contact left card responsive */
  .contact-left-card { padding: 28px 24px; }
  .contact-left-card__title { font-size: 26px; margin-bottom: 24px; }
  .contact-left-card__value--tel { font-size: 20px; }
  .contact-left-card__qrcode { gap: 16px; }
  .contact-left-card__qrcode-img { width: 90px; height: 90px; }
  .contact-left-card__qrcode-text { font-size: 13px; }
}

@media (max-width: 480px) {
  /* ─── 480px以下：二级菜单宽度进一步缩减 ─── */
  .products-subnav { width: 140px; }
  .main-content.has-products-subnav { margin-left: 140px; }
  body.has-products-subnav .footer { margin-left: 140px; }
  .footer { margin-left: 0; }

  .contact-form { padding: 24px; }
  .moq-card { padding: 24px; }
  .about-firstar-banner { height: 180px; }
  .about-firstar-stats__val { font-size: 26px; }
  .business-model-steps-grid { grid-template-columns: 1fr; }
  .business-model-carousel__card { flex: 0 0 calc(100% - 0px); height: 180px; }
}

/* ══════════════════════════════════════════
   视频弹窗
═════════════════════════════════════════ */
.video-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
}

.video-modal.active {
  display: flex;
}

.video-modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  cursor: pointer;
}

.video-modal__container {
  position: relative;
  z-index: 2;
  background: #000;
  width: 90vw;
  max-width: 960px;
}

.video-modal__close {
  position: absolute;
  top: -40px;
  right: 0;
  width: 32px;
  height: 32px;
  border: none;
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 20px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-modal__content {
  width: 100%;
  height: 100%;
}

.video-modal__content video,
.video-modal__content iframe {
  width: 100%;
  height: 100%;
  display: block;
}

/* ══════════════════════════════════════════════
   区块分割线
══════════════════════════════════════════════ */
.section-divider {
  border: none;
  height: 1px;
  background: #194079;
  margin: 0;
}

/* ══════════════════════════════════════════════
   Our Strength 区块（重制版）
══════════════════════════════════════════════ */

/* 整体容器：左右分栏 */
.our-strength-section {
  position: relative;
  display: flex;
  width: 100%;
  background-color: #0a3470;
  height: 960px;
  overflow: hidden;
}

/* ── 左侧深蓝内容区 ── */
.our-strength-left {
  position: relative;
  flex: 0 0 55%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 6% 8%;
  overflow: hidden;
  z-index: 1;
}

/* SVG 流线装饰（绝对定位） */
.our-strength-deco {
  position: absolute;
  left: 0;
  width: 100%;
  pointer-events: none;
  z-index: 0;
}

.our-strength-deco--top {
  top: 0;
  height: 220px;
}

.our-strength-deco--bottom {
  bottom: 0;
  height: 160px;
}

/* 左侧内容层叠在装饰上方 */
.our-strength-title,
.our-strength-top-img,
.our-strength-mid-imgs,
.our-strength-bottom-text {
  position: relative;
  z-index: 1;
}

/* ① 大标题：单行显示 */
.our-strength-title {
  font-size: clamp(3rem, 5vw, 5rem);
  font-weight: 800;
  color: #ffffff;
  line-height: 1.05;
  letter-spacing: 0.01em;
  margin: 0;
  font-family: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  white-space: nowrap;
}

/* ② 标题下方设备小图：独占一行 */
.our-strength-top-img {
  width: 100%;
  height: 200px;
  overflow: hidden;
  border-radius: 0;
}

.our-strength-top-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ② 中部：3张等宽工业小图横排 */
.our-strength-mid-imgs {
  display: flex;
  gap: 10px;
  flex: 0 0 auto;
}

.our-strength-mid-img {
  flex: 1;
  height: 180px;
  overflow: hidden;
}

.our-strength-mid-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ③ 底部：文字组 */
.our-strength-bottom-text {
  flex: 0 0 auto;
}

.our-strength-bottom-text__newsletter {
  display: block;
  font-size: 1rem;
  font-weight: 500;
  color: #f0b400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 10px;
  font-family: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

.our-strength-bottom-text__sub {
  font-size: clamp(1.4rem, 2.2vw, 2rem);
  font-weight: 700;
  color: #ffffff;
  line-height: 1.25;
  margin: 0;
  font-family: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

/* ── 右侧大图区 ── */
.our-strength-right {
  position: relative;
  flex: 0 0 45%;
  overflow: hidden;
  padding: 5% 5% 5% 0;
}

.our-strength-right > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  border-radius: 0;
}

/* 右边缘深蓝线条纹理 */
.our-strength-right-deco {
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* ── 响应式 ── */
@media (max-width: 1100px) {
  .our-strength-section {
    height: auto;
    min-height: 700px;
  }
  .our-strength-title {
    font-size: 3rem;
  }
  .our-strength-top-img {
    height: 160px;
  }
  .our-strength-mid-img {
    height: 140px;
  }
}

@media (max-width: 900px) {
  .our-strength-section {
    flex-direction: column;
    height: auto;
  }
  .our-strength-left {
    flex: none;
    padding: 48px 7%;
    gap: 32px;
  }
  .our-strength-right {
    flex: none;
    height: 380px;
    padding: 5%;
  }
  .our-strength-top-img {
    height: 140px;
  }
  .our-strength-mid-img {
    height: 120px;
  }
}

@media (max-width: 600px) {
  .our-strength-title {
    font-size: 2.4rem;
    white-space: normal;
  }
  .our-strength-top-img {
    width: 100%;
    height: 160px;
  }
  .our-strength-mid-img {
    height: 100px;
  }
  .our-strength-right {
    height: 280px;
    padding: 5%;
  }
  .our-strength-bottom-text__sub {
    font-size: 1.3rem;
  }

  /* 页脚认证图片：手机端不折行，3张均分宽度，图片间间距5% */
  .footer-certs {
    flex-wrap: nowrap;
    gap: 5%;
  }
  .footer-cert-img {
    flex: 1;
    min-width: 0;
    width: auto;
    max-width: 30%;
  }
}

/* ── 图片懒加载样式 ── */
img[loading="lazy"] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}

img[loading="lazy"].lazy-loaded {
  opacity: 1;
  transform: translateY(0);
}

.img-placeholder {
  background: linear-gradient(135deg, #f5f5f5 25%, #e8e8e8 50%, #f5f5f5 75%);
  background-size: 200% 200%;
  animation: placeholder-shimmer 1.5s ease-in-out infinite;
}

@keyframes placeholder-shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ── 图片布局抖动优化 ── */
img {
  max-width: 100%;
  height: auto;
}

.hero-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-firstar-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}