/* 基础样式与变量 */
:root {
  --brand: #004ea2;
  --brand-2: #0a7bd9;
  --text: #1f2a37;
  --muted: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --shadow: 0 6px 20px rgba(0,0,0,.08);
  --radius: 0; /* 工业风：直角 */
  --radius-sm: 0; /* 工业风：直角 */
  --container: 1200px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--brand); text-decoration: none; }
.container { width: min(100% - 32px, var(--container)); margin-inline: auto; }
.btn { display: inline-block; padding: 12px 18px; border-radius: 0; border: 1px solid transparent; font-weight: 600; }
.btn--primary { background: var(--brand); color: #fff; box-shadow: var(--shadow); }
.btn--primary:hover { background: var(--brand-2); }
.section { padding: 64px 0; }
.section--alt { padding: 64px 0; background: var(--bg-alt); }
.section__title { margin: 0 0 24px; font-size: 28px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
@media (max-width: 900px) { .grid-2 { grid-template-columns: 1fr; } }
.list { padding-left: 18px; }

/* 顶部栏 */
.topbar { background: #fff; border-bottom: 1px solid #eef0f3; position: sticky; top: 0; z-index: 50; }
.topbar__inner { display: flex; align-items: center; justify-content: space-between; padding: 10px 0; }
.logo { display: flex; align-items: center; gap: 8px; }
.logo img { height: 36px; }
.logo__name { font-weight: 800; color: #e50e09; letter-spacing: .5px; }
.logo__text { font-weight: 700; color: var(--brand); font-size: 18px; }

/* 顶部导航 */
.topbar__nav { flex: 1; display: flex; justify-content: flex-start; margin-left: 16px; }
.topbar__nav-links { list-style: none; display: flex; gap: 28px; margin: 0; padding: 0; }
.topbar__nav-btn { background: transparent; border: none; color: var(--text); padding: 6px 10px; font: inherit; cursor: pointer; border-radius: 0; font-weight: 500; width: 96px; text-align: center; white-space: nowrap; }
.topbar__nav-btn:hover { background: var(--bg-alt); color: var(--brand); }

/* 顶部语言国旗（静态展示） */
.lang-flags { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.lang-flags button {
  background: var(--bg-alt);
  border: 1px solid transparent;
  color: var(--muted);
  padding: 6px 4px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 0;
  cursor: pointer;
  transition: all .2s;
}
.lang-flags button:hover {
  background: #e5e7eb;
  color: var(--text);
}
.lang-flags button.active {
  background: var(--brand);
  color: #fff;
  font-weight: 600;
}

/* 多语言折叠组件 */
.lang { position: relative; }
.lang__toggle {
  display: inline-flex; /* Always visible */
  background: #fff;
  border: 1px solid #e5e7eb;
  padding: 6px 10px;
  border-radius: 0;
  color: var(--text);
  cursor: pointer;
  align-items: center;
  gap: 4px;
}
.lang__toggle svg {
  width: 16px;
  height: 16px;
  transition: transform .2s;
}
.lang.open .lang__toggle svg {
  transform: rotate(180deg);
}
.lang__toggle:hover { background: var(--bg-alt); }

.lang__menu {
  display: none; /* Hidden by default */
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  background: #fff;
  border: 1px solid #e5e7eb;
  box-shadow: var(--shadow);
  padding: 8px;
  border-radius: 0;
  z-index: 60;
  min-width: 180px;
}

.lang.open .lang__menu { display: block; }

@media (max-width: 880px) {
  .topbar__nav { display: none; }
}

/* 英雄区与导航：仅显示原始图片，无蒙版与文案，不裁切 */
.hero { position: relative; background: #fff; }
.hero__img { width: 100%; height: auto; display: block; }
.hero__overlay { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: 800px; max-width: 92vw; height: auto; z-index: 1; pointer-events: none; }
.nav { position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: min(100% - 32px, var(--container)); z-index: 2; display: flex; align-items: center; justify-content: space-between; padding: 16px 0; }
.nav__brand { color: #fff; font-weight: 700; letter-spacing: .5px; }
.nav__toggle { color: #fff; font-size: 18px; background: transparent; border: 1px solid rgba(255,255,255,.8); padding: 4px 8px; border-radius: 0; display: none; }
.nav__links { list-style: none; display: flex; gap: 20px; margin: 0; padding: 0; }
.nav__links a { color: #fff; padding: 8px 12px; border-radius: 0; }
.nav__links a:hover { background: rgba(0,0,0,.35); }
/* 新增按钮样式：默认纯文字，悬浮灰底 */
.nav__btn { background: transparent; border: none; color: #fff; padding: 8px 12px; font: inherit; cursor: pointer; border-radius: 0; }
.nav__btn:hover { background: rgba(0,0,0,.35); }
@media (max-width: 880px) {
  .nav__toggle { display: inline-block; }
  .nav__links { position: absolute; right: 16px; top: 58px; background: rgba(0,0,0,.65); border: 1px solid rgba(255,255,255,.2); padding: 12px; border-radius: 0; flex-direction: column; display: none; }
  .nav__links.open { display: flex; }
}
/* 手机端 Banner 裁剪，避免过矮 */
@media (max-width: 640px) {
  .hero { min-height: 46vh; overflow: hidden; }
  .hero__img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
}
/* 已移除英雄区文案样式 */

/* 卡片组 */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card { background: #fff; padding: 18px; border-radius: var(--radius); box-shadow: var(--shadow); }
.card h3 { margin-top: 0; }
@media (max-width: 1000px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .cards { grid-template-columns: 1fr; } }

/* Tabs */
.tabs { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.tabs button { padding: 8px 12px; border: 1px solid #e5e7eb; background: #fff; border-radius: 0; cursor: pointer; }
.tabs button.active { background: var(--brand); color: #fff; border-color: var(--brand); }

/* 轮播通用样式 */
.carousel { position: relative; }
.carousel__track { display: grid; grid-auto-flow: column; grid-auto-columns: calc((100% - 32px) / 3); gap: 16px; overflow: hidden; scroll-snap-type: x mandatory; scroll-behavior: smooth; }
.carousel__slide { scroll-snap-align: start; background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; display: flex; flex-direction: column; }
.carousel__slide img { width: 100%; height: 200px; object-fit: cover; }
.carousel__slide .slide__body { padding: 12px; font-weight: 600; }
.carousel__btn { position: absolute; top: 50%; transform: translateY(-50%); width: 36px; height: 36px; border-radius: 0; border: none; background: rgba(0,0,0,.55); color: #fff; cursor: pointer; display: grid; place-items: center; z-index: 2; }
.carousel__btn:hover { background: rgba(0,0,0,.7); }
.carousel__btn.prev { left: -8px; }
.carousel__btn.next { right: -8px; }
/* 已移除底部分页圆点导航 */
@media (max-width: 1000px) { .carousel__track { grid-auto-columns: calc((100% - 16px) / 2); } }
@media (max-width: 640px) { .carousel__track { grid-auto-columns: 100%; } .carousel__btn.prev { left: 6px; } .carousel__btn.next { right: 6px; } }

/* 联系我们 */
.contact { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
@media (max-width: 640px) { .contact { grid-template-columns: 1fr; } }
.contact__item { background: #fff; border-radius: var(--radius-sm); padding: 12px; box-shadow: var(--shadow); }

/* 联系人卡片 */
.contact-person { display: flex; align-items: center; gap: 16px; background: #fff; border: 1px solid #e5e7eb; box-shadow: var(--shadow); padding: 20px; border-radius: var(--radius); margin-bottom: 20px; max-width: 600px; margin-left: auto; margin-right: auto; }

.contact-person--no-qrcode { justify-content: flex-start; }

.contact-person__qrcode { flex-shrink: 0; order: 2; }
.contact-person__qrcode img { 
  width: 80px; 
  height: 80px; 
  object-fit: contain; 
  display: block; 
}

.contact-person__info { flex: 1; order: 1; }
.contact-person__name { 
  margin: 0 0 4px 0; 
  font-size: 20px; 
  font-weight: 600; 
  color: var(--brand); 
}

.contact-person__title {
  margin: 0 0 8px 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}

/* 公司联系信息卡片 */
.contact-card { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 12px; background: #fff; border: 1px solid #e5e7eb; box-shadow: var(--shadow); padding: 16px; border-radius: var(--radius); max-width: 600px; margin: 20px auto 0; }
.contact-card h3 { margin: 0 0 12px 0; font-size: 18px; color: var(--brand); }
.contact-list { display: grid; gap: 6px; }
.contact-list__item a { color: var(--brand); }
.contact-card__qrcode img { width: 120px; height: 120px; object-fit: contain; display: block; }

@media (max-width: 800px) {
  .contact-card { grid-template-columns: 1fr; justify-items: start; }
  .contact-card__qrcode img { width: 120px; height: 120px; }
  .contact-person { flex-direction: column; text-align: center; }
  .contact-person--no-avatar { flex-direction: row; text-align: left; }
}

/* 手机端居中二维码 */
@media (max-width: 640px) {
  .contact-card__qrcode { justify-self: center; }
}

/* 页脚 */
.footer { background: #0f172a; color: #cbd5e1; padding: 18px 0; }
.footer__inner { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
@media (max-width: 700px) { .footer__inner { flex-direction: column; } }