/* =====================================================
   全局基础样式 — 达润自动化 (Darren Autotech) 官网
   ===================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

html, body {
  overflow-x: hidden;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

svg, video {
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

main.main-content {
  flex: 1 0 auto;
}

/* ===== 容器 ===== */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  overflow-wrap: anywhere;
}

/* ===== 区块通用间距 ===== */
.section {
  padding: var(--section-gap) 0;
}

.section-sm {
  padding: 48px 0;
}

.section-gray {
  background: var(--color-white);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 28px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(26, 124, 62, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary-light);
}

.btn-white {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
}
.btn-white:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
}

.btn-lg {
  padding: 14px 40px;
  font-size: 16px;
}

/* ===== 卡片 ===== */
.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: 12px;
  padding: 3px 10px;
  margin: 0 4px 4px 0;
  font-weight: 500;
}

.tag-gray {
  background: #f0f0f0;
  color: var(--color-text-muted);
}

/* ===== 占位图 ===== */
.placeholder-img {
  background: #d8d8d8;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999;
  font-size: 12px;
  text-align: center;
  padding: 8px;
}

/* ===== 加载态 ===== */
.loading-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 0;
  color: var(--color-text-muted);
  font-size: 15px;
}

/* ===== 空状态 ===== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 0;
  color: var(--color-text-muted);
}
.empty-state p {
  font-size: 15px;
  margin-top: 12px;
}

/* ===== 分隔线 ===== */
.divider {
  height: 1px;
  background: var(--color-border);
}

/* =====================================================
   站点头部 (site-header)
   ===================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled {
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
}

.site-header .header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 40px;
}

.site-header .logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  flex-shrink: 0;
}
.site-header .logo-en {
  font-size: 20px;
  color: var(--color-primary);
  letter-spacing: 0.5px;
}
.site-header .logo-divider {
  color: var(--color-border-mid);
  font-weight: 300;
}
.site-header .logo-cn {
  font-size: 15px;
  color: var(--color-text);
}

.site-header .nav-desktop {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.site-header .nav-link {
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}
.site-header .nav-link:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}
.site-header .nav-link.active {
  color: var(--color-primary);
  font-weight: 600;
  background: var(--color-primary-light);
}

.site-header .hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  margin-left: auto;
  padding: 4px;
}
.site-header .hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.site-header .nav-mobile {
  display: none;
  flex-direction: column;
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.site-header .nav-mobile.open {
  max-height: 70vh;
  overflow-y: auto;
}
.site-header .mobile-nav-link {
  padding: 14px 24px;
  font-size: 15px;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}
.site-header .mobile-nav-link:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}
.site-header .mobile-nav-link.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}

@media (max-width: 767px) {
  .site-header .nav-desktop { display: none; }
  .site-header .hamburger { display: flex; }
  .site-header .nav-mobile { display: flex; }
}

/* =====================================================
   站点页脚 (site-footer)
   ===================================================== */
.site-footer {
  background: #1a1a1a;
  color: rgba(255, 255, 255, 0.75);
  flex-shrink: 0;
}

.site-footer .footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
  padding: 56px 24px 40px;
}

.site-footer .brand-name .en {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary-mid);
  letter-spacing: 0.5px;
}
.site-footer .brand-cn {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  margin: 6px 0 12px;
}
.site-footer .brand-desc {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.5);
  max-width: 280px;
}

.site-footer .col-title {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.site-footer .footer-col ul li {
  margin-bottom: 10px;
  font-size: 14px;
}
.site-footer .footer-col ul li a {
  color: rgba(255, 255, 255, 0.65);
  transition: color var(--transition);
}
.site-footer .footer-col ul li a:hover {
  color: var(--color-primary-mid);
}

.site-footer .contact-list li {
  display: flex;
  align-items: center;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 10px;
  font-size: 14px;
}
.site-footer .contact-icon {
  display: inline-block;
  width: 22px;
  flex-shrink: 0;
  text-align: center;
  margin-right: 8px;
}

.site-footer .footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 24px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
  text-align: center;
}
.site-footer .footer-bottom .icp-link {
  color: rgba(255, 255, 255, 0.4);
  transition: color var(--transition);
}
.site-footer .footer-bottom .icp-link:hover {
  color: var(--color-primary-mid);
}
.site-footer .footer-bottom .icp-sep {
  margin: 0 4px;
}

@media (max-width: 900px) {
  .site-footer .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px 40px;
  }
}

@media (max-width: 767px) {
  .site-footer .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 32px;
  }
  .site-footer .footer-bottom .icp-sep {
    display: none;
  }
  .site-footer .footer-bottom .icp-link {
    display: block;
    margin-top: 4px;
  }
}

@media (max-width: 767px) {
  .section-title { font-size: 22px; }
  .section-title-wrap { margin-bottom: 28px; }
}

/* =====================================================
   区块标题 (section-title)
   ===================================================== */
.section-title-wrap {
  margin-bottom: 40px;
}
.section-title-wrap.center {
  text-align: center;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  position: relative;
  padding-left: 16px;
  display: inline-block;
}
.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 26px;
  background: var(--color-primary);
  border-radius: 2px;
}

.section-title-wrap.center .section-title {
  padding-left: 0;
}
.section-title-wrap.center .section-title::before {
  display: none;
}
.section-title-wrap.center .section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 4px;
  background: var(--color-primary);
  border-radius: 2px;
  margin: 10px auto 0;
}

.section-subtitle {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-top: 10px;
  line-height: 1.7;
}

/* =====================================================
   语言切换
   ===================================================== */
.site-header .lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 18px;
  font-size: 14px;
}
.site-header .lang-switch a {
  color: var(--color-text-secondary);
  padding: 2px 4px;
  transition: color var(--transition);
}
.site-header .lang-switch a:hover { color: var(--color-primary); }
.site-header .lang-switch a.active { color: var(--color-primary); font-weight: 600; }
.site-header .lang-switch .lang-sep { color: var(--color-border); }

.site-header .mobile-lang {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
}
.site-header .mobile-lang a { color: var(--color-text-secondary); }
.site-header .mobile-lang a.active { color: var(--color-primary); font-weight: 600; }
.site-header .mobile-lang .lang-sep { color: var(--color-border); }

@media (max-width: 767px) {
  .site-header .lang-switch { display: none; }
}