/* ============================================================
   宝塑管业官网 · 组件库 (Components)
   按钮 / 卡片 / 导航 / 表单 / 信任徽章 / CTA 区
   ============================================================ */

/* ============================ 按钮 ============================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  border: 2px solid transparent;
  text-align: center;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn--accent {
  background: var(--color-accent);
  color: #fff;
}
.btn--accent:hover {
  background: var(--color-accent-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 122, 26, 0.3);
}
.btn--outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.6);
}
.btn--outline:hover {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
}
.btn--ghost {
  background: var(--color-primary-50);
  color: var(--color-primary);
}
.btn--ghost:hover {
  background: var(--color-primary);
  color: #fff;
}
.btn--blue-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--blue-outline:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  transform: translateY(-2px);
}
.btn--lg { padding: 16px 40px; font-size: 1.0625rem; }
.btn--sm { padding: 8px 20px; font-size: 0.875rem; }
.btn--block { width: 100%; }

/* ============================ 顶部导航 ============================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.98);
  transition: all var(--transition);
}
.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}
/* 首页 Header 默认透明（叠在 Hero 上），滚动后变白 */
.site-header--transparent {
  background: rgba(15, 37, 64, 0.25);
  backdrop-filter: blur(8px);
}
.site-header--transparent.is-scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
}
.site-header--transparent .logo__text,
.site-header--transparent .nav__link {
  color: #fff;
}
.site-header--transparent .logo__sub { color: rgba(255,255,255,0.7); }
.site-header--transparent.is-scrolled .logo__text,
.site-header--transparent.is-scrolled .nav__link {
  color: var(--color-text);
}
.site-header--transparent.is-scrolled .logo__sub { color: var(--color-text-secondary); }
.site-header--transparent .nav__link:hover { color: var(--color-accent); }

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo__mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}
.logo__img {
  height: 44px;
  width: auto;
  flex-shrink: 0;
  display: block;
}
.logo__text {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.1;
}
.logo__sub {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
}

/* 主导航 */
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav__item {
  position: relative;
}
.nav__link {
  display: block;
  padding: 10px 18px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  position: relative;
  transition: all var(--transition-fast);
}
.nav__link:hover,
.nav__link.is-active {
  color: var(--color-primary);
}
.nav__link.is-active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-accent);
}
.nav__item--has-dropdown > .nav__link {
  padding-right: 28px;
}
.nav__item--has-dropdown > .nav__link::before {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-65%) rotate(45deg);
  transition: transform var(--transition-fast);
}
.nav__item--has-dropdown:hover > .nav__link::before,
.nav__item--has-dropdown:focus-within > .nav__link::before {
  transform: translateY(-35%) rotate(225deg);
}
.nav-dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  min-width: 176px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 8px);
  transition: all var(--transition-fast);
  z-index: calc(var(--z-header) + 1);
}
.nav-dropdown::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -14px;
  height: 14px;
}
.nav-dropdown--wide {
  min-width: 220px;
}
.nav-dropdown a {
  display: block;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.875rem;
  white-space: nowrap;
  transition: all var(--transition-fast);
}
.nav-dropdown a:hover,
.nav-dropdown a:focus-visible {
  background: var(--color-primary-50);
  color: var(--color-primary);
}
.nav__item--has-dropdown:hover .nav-dropdown,
.nav__item--has-dropdown:focus-within .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

/* 顶部右侧操作区 */
.header-action {
  display: flex;
  align-items: center;
  gap: 16px;
}
.header-lang {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}
.header-lang:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.header-lang svg {
  color: var(--color-primary);
}

/* 汉堡按钮（移动端） */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition);
}
.site-header--transparent:not(.is-scrolled) .nav-toggle span { background: #fff; }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================ Hero 主视觉（轮播Banner） ============================ */
.hero {
  position: relative;
  min-height: 100vh;
  background: #0F2540;
  overflow: hidden;
}

/* 轮播容器 */
.hero-slider {
  position: absolute;
  inset: 0;
  z-index: 0;
}

/* 单张Banner */
.hero-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease, visibility 0.8s ease;
  z-index: 0;
  background: #0F2540;
}
.hero-slide.is-active {
  opacity: 1;
  visibility: visible;
  z-index: 1;
}

/* 背景图层 */
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: #0F2540;
}
.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
  transition: transform 8s ease-out;
}
.hero-slide.is-active .hero__bg img {
  transform: scale(1.05);
}
.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,37,64,0.9) 0%, rgba(15,37,64,0.75) 18%, rgba(15,37,64,0.4) 33%, rgba(15,37,64,0) 50%);
}

/* 内容区域动画 */
.hero-slide .hero__inner {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease 0.3s, transform 0.6s ease 0.3s;
}
.hero-slide.is-active .hero__inner {
  opacity: 1;
  transform: translateY(0);
}

.hero__inner {
  position: relative;
  z-index: 1;
  color: #fff;
  width: 100%;
  padding-top: 0;
  padding-bottom: 60px;
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(255, 122, 26, 0.15);
  border: 1px solid rgba(255, 122, 26, 0.4);
  border-radius: var(--radius-pill);
  font-size: 0.875rem;
  font-weight: 500;
  color: #FFB37D;
  margin-bottom: var(--space-lg);
}
.hero__title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: var(--space-lg);
  max-width: 800px;
}
.hero__title em {
  font-style: normal;
  color: #4A9EFF;
}
.hero__desc {
  font-size: 1.25rem;
  line-height: 1.7;
  opacity: 0.9;
  max-width: 600px;
  margin-bottom: var(--space-xl);
}
.hero__actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* 切换按钮 */
.hero-slider__prev,
.hero-slider__next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}
.hero-slider__prev:hover,
.hero-slider__next:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-50%) scale(1.1);
}
.hero-slider__prev { left: 24px; }
.hero-slider__next { right: 24px; }

/* 指示器 */
.hero-slider__dots {
  position: absolute;
  bottom: 90px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: 12px;
}
.hero-slider__dot {
  width: 12px;
  height: 12px;
  background: rgba(255, 255, 255, 0.3);
  border: 2px solid transparent;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
}
.hero-slider__dot:hover {
  background: rgba(255, 255, 255, 0.5);
}
.hero-slider__dot.is-active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  transform: scale(1.2);
}

/* 底部信任条 */
.hero__trust {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(15, 37, 64, 0.6);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255,255,255,0.1);
  z-index: 2;
}
.hero__trust-inner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: var(--space-md) var(--container-padding);
  gap: var(--space-md);
  flex-wrap: wrap;
}
.hero__trust-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 0.9375rem;
}
.hero__trust-item svg { color: var(--color-accent); flex-shrink: 0; }

/* ============================ 数字看板 ============================ */
.stats {
  background: var(--color-bg);
}
.stats__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-lg);
}
.stat-card {
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  border-right: 1px solid var(--color-border);
}
.stat-card:last-child { border-right: none; }
.stat-card__num {
  font-family: var(--font-num);
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}
.stat-card__num small {
  font-size: 1.25rem;
  color: var(--color-accent);
  margin-left: 2px;
}
.stat-card__label {
  margin-top: var(--space-sm);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

/* ============================ 优势卡片 ============================ */
.advantage-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl) var(--space-lg);
  height: 100%;
  transition: all var(--transition);
}
.advantage-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-6px);
}
.advantage-card__icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: var(--color-primary-50);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  transition: all var(--transition);
}
.advantage-card:hover .advantage-card__icon {
  background: var(--color-primary);
  color: #fff;
}
.advantage-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}
.advantage-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================ 产品卡片 ============================ */
.product-card {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-6px);
}
.product-card__media {
  display: block;
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-bg-alt);
}
.product-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.product-card:hover .product-card__media img {
  transform: scale(1.08);
}
/* 装备智造 · 宽幅 6:1 比例产品图 */
.product-card--wide .product-card__media {
  aspect-ratio: 6 / 1;
}

/* ============================ 完美服务体系 · 五大环节上下两行卡片 ============================ */
.system-grid {
  gap: var(--space-lg);
}
.system-grid--top {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}
.system-grid--bottom {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: var(--space-lg);
}
.system-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}
.system-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.system-card__icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-50);
  color: var(--color-primary);
  border-radius: var(--radius-md);
}
.system-card__body { flex: 1; }
.system-card__body h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}
.system-card__body p {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}
.product-card__tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
}
.product-card__body {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}
.product-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}
.product-card__title a {
  color: inherit;
}
.product-card__title a:hover {
  color: var(--color-primary);
}
.product-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
  flex: 1;
}
.product-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-primary);
}
.product-card__link:hover {
  color: var(--color-accent);
  gap: 12px;
}

/* ============================ 解决方案 Tab ============================ */
.solution-tabs {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}
.solution-tab {
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition);
}
.solution-tab:hover { border-color: var(--color-primary); color: var(--color-primary); }
.solution-tab.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
a.solution-tab {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
.solution-panel {
  display: none;
}
.solution-panel.is-active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}
.solution-panel__media img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}
.solution-panel__title {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}
.solution-panel__desc {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}
.solution-features {
  display: grid;
  gap: var(--space-md);
}
.solution-features li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9375rem;
}
.solution-features svg {
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ============================ 案例卡片 ============================ */
.case-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  aspect-ratio: 4 / 3;
}
.case-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.case-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.case-card:hover img { transform: scale(1.08); }
.case-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15,37,64,0.95) 0%, rgba(15,37,64,0.3) 60%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-lg);
  color: #fff;
}
.case-card__tag {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 12px;
  background: var(--color-accent);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-sm);
}
a.case-card__tag {
  text-decoration: none;
  color: inherit;
}
.case-card__title {
  font-size: 1.25rem;
  font-weight: 600;
}
.case-card__meta {
  font-size: 0.875rem;
  opacity: 0.8;
  margin-top: 4px;
}

/* ============================ 新闻卡片 ============================ */
.news-card {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.news-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.news-card__media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.news-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.news-card:hover .news-card__media img { transform: scale(1.06); }
.news-card__body {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}
.news-card__date {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}
.news-card__title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  line-height: 1.5;
}
.news-card__excerpt {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  flex: 1;
}

/* ============================ CTA 行动召唤区 ============================ */
.cta-band {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: #fff;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 90% 50%, rgba(255,122,26,0.2) 0%, transparent 50%);
}
.cta-band__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}
.cta-band__title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}
.cta-band__desc {
  font-size: 1.0625rem;
  opacity: 0.9;
}

/* ============================ 信任徽章条 ============================ */
.trust-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
  flex-wrap: wrap;
  padding: var(--space-lg) 0;
}
.trust-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}
.trust-badge svg { color: var(--color-primary); }

/* ============================ 表单 ============================ */
.form-group {
  margin-bottom: 3px;
}
.form-label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 500;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}
.form-label .req { color: var(--color-accent); }
.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  transition: all var(--transition-fast);
}
.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(14, 95, 181, 0.12);
}
textarea.form-control {
  resize: vertical;
  min-height: 120px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

/* ============================ 信息卡片（联系/通用） ============================ */
.info-card {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.info-card__icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: var(--color-primary-50);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}
.info-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.info-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ============================ 时间轴（发展历程） ============================ */
.timeline {
  position: relative;
  padding-left: 40px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}
.timeline-item {
  position: relative;
  padding-bottom: var(--space-2xl);
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item__dot {
  position: absolute;
  left: -34px;
  top: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 4px solid var(--color-primary);
}
.timeline-item__year {
  font-family: var(--font-num);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}
.timeline-item__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}
.timeline-item__desc {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================ 资质证书墙 ============================ */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}
.cert-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  transition: all var(--transition);
  cursor: pointer;
}
.cert-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.cert-item__media {
  aspect-ratio: 3 / 4;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
  overflow: hidden;
}
.cert-item__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.cert-item__title {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* ============================ 悬浮工具栏 ============================ */
.float-tools {
  position: fixed;
  right: 20px;
  bottom: 40px;
  z-index: var(--z-float);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.float-tool {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--color-bg);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}
.float-tool:hover {
  background: var(--color-primary);
  color: #fff;
  transform: scale(1.08);
}
.float-tool__label {
  position: absolute;
  right: 64px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--color-text);
  color: #fff;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.float-tool:hover .float-tool__label { opacity: 1; }
/* 返回顶部：默认隐藏，滚动后显示 */
.float-tool--top {
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
}
.float-tools.is-visible .float-tool--top {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ============================ 页脚 ============================ */
.site-footer {
  background: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding-top: var(--space-3xl);
}
.site-footer a { color: rgba(255, 255, 255, 0.7); }
.site-footer a:hover { color: #fff; }
.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  column-gap: var(--space-xl);
  row-gap: var(--space-xl);
  align-items: start;
  padding-bottom: var(--space-2xl);
}
.footer-grid > * {
  min-width: 0;
  width: 100%;
  text-align: center;
}
.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}
.footer-slogan-lg {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 2px;
  text-align: center;
  white-space: nowrap;
}
.footer-qr-group {
  display: flex;
  flex-wrap: nowrap;
  gap: var(--space-sm);
  justify-content: center;
}
.footer-qr-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 0 0 auto;
  gap: 6px;
}
.footer-qr-item span {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.6);
}
.footer-brand .logo__text { color: #fff; }
.footer-brand .logo__sub { color: rgba(255,255,255,0.5); }
.footer-desc {
  margin-top: var(--space-md);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
}
.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  align-items: left;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  font-size: 0.9375rem;
}
.footer-contact li {
  display: flex;
  justify-content: left;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.9375rem;
  line-height: 1.5;
  text-align: left;
}
.footer-contact svg { color: var(--color-accent); flex-shrink: 0; margin-top: 3px; }
.footer-qr {
  width: 76px;
  height: 76px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.4);
  font-size: 0.625rem;
  margin-top: 0;
  text-align: center;
  line-height: 1.35;
  padding: 8px;
}
.footer-slogan {
  text-align: center;
  padding: var(--space-lg) 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 2px;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: var(--space-lg) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  flex-wrap: wrap;
  gap: var(--space-md);
}
.footer-bottom__links {
  display: flex;
  gap: var(--space-md);
}

/* ============================ 移动端抽屉菜单 ============================ */
.nav-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 320px;
  height: 100vh;
  background: var(--color-bg);
  z-index: var(--z-drawer);
  box-shadow: -8px 0 32px rgba(0,0,0,0.15);
  transition: right var(--transition);
  overflow-y: auto;
  padding: 80px var(--space-lg) var(--space-lg);
}
.nav-drawer.is-open { right: 0; }
.nav-drawer__close {
  position: absolute;
  top: 20px;
  right: 18px;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--color-text);
  font-size: 26px;
  line-height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, color 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}
.nav-drawer__close:hover {
  background: var(--color-border);
  color: var(--color-primary);
}
.nav-drawer__link {
  display: block;
  padding: 14px 0;
  font-size: 1.0625rem;
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}
.nav-drawer__link:hover,
.nav-drawer__link.is-active { color: var(--color-primary); }
.nav-drawer__group {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 10px 0 14px;
  border-bottom: 1px solid var(--color-border);
}
.nav-drawer__group a {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}
.nav-drawer__group a:hover {
  background: var(--color-primary-50);
  color: var(--color-primary);
}
.nav-drawer__cta {
  margin-top: var(--space-lg);
}
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 37, 64, 0.5);
  z-index: var(--z-drawer) - 1;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.nav-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}