/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html {
  font-size: 14px;
}
html, body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: #333;
  line-height: 1.6;
  background: #fff;
  margin: 0;
  padding: 0;
  min-width: calc(1440.0/14 * 1rem);
}
html {
  overflow-x: auto;
}
body { font-size: 1rem; }
a { text-decoration: none; color: inherit; }
ul, li { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
.container {
  width: calc(1200 / 14 * 1rem);
  margin: 0 auto;
  padding: 0 calc(20 / 14 * 1rem);
}

/* ===== Header ===== */
.main-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: calc(80.0/14 * 1rem);
  background: #fff;
  border-bottom: 1px solid #eee;
  z-index: 1000;
  display: flex;
  align-items: center;
}
.header-inner {
  width: calc(1200.0/14 * 1rem);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 calc(20.0/14 * 1rem);
}
.logo {
  display: flex;
  align-items: baseline;
  gap: calc(10.0/14 * 1rem);
  text-decoration: none;
}
.logo-en { font-size: calc(20.0/14 * 1rem); font-weight: 900; color: #1565c0; letter-spacing: 1px; }
.logo-cn { font-size: calc(18.0/14 * 1rem); font-weight: bold; color: #333; letter-spacing: 1px; }

.nav-menu { display: flex; align-items: center; margin-left: calc(200.0/14 * 1rem); }
.nav-item {
  position: relative;
  padding: 0 calc(24.0/14 * 1rem);
  height: calc(80.0/14 * 1rem);
  display: flex;
  align-items: center;
  font-size: calc(18.0/14 * 1rem);
  color: #333;
  cursor: pointer;
  transition: color 0.2s;
}
.nav-item:hover, .nav-item.active { color: #1565c0; }
.nav-item a { color: inherit; }

/* ===== Mega Menu Dropdown ===== */
.mega-dropdown {
  position: absolute;
  top: calc(80.0/14 * 1rem);
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  box-shadow: 0 calc(4.0/14 * 1rem) calc(20.0/14 * 1rem) rgba(0,0,0,0.1);
  border-radius: 0 0 calc(8.0/14 * 1rem) calc(8.0/14 * 1rem);
  padding: calc(24.0/14 * 1rem) calc(32.0/14 * 1rem);
  min-width: calc(600.0/14 * 1rem);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 1001;
}
.nav-item:hover .mega-dropdown,
.mega-dropdown.show {
  opacity: 1;
  visibility: visible;
}
.dropdown-simple {
  min-width: calc(160.0/14 * 1rem);
  padding: calc(12.0/14 * 1rem) 0;
}
.dropdown-simple .dropdown-link {
  display: block;
  padding: calc(10.0/14 * 1rem) calc(24.0/14 * 1rem);
  font-size: 1rem;
  color: #000 !important;
  transition: all 0.2s;
  white-space: nowrap;
}
.dropdown-simple .dropdown-link:hover {
  color: #1565c0;
  background: #f5f7fa;
}

.mega-content { display: flex; gap: calc(40.0/14 * 1rem); }
.mega-col { flex: 1; }
.mega-title {
  font-size: calc(15.0/14 * 1rem);
  font-weight: bold;
  color: #000;
  margin-bottom: calc(12.0/14 * 1rem);
  padding-bottom: calc(8.0/14 * 1rem);
  border-bottom: 1px solid #e8ecf1;
}
.nav-item .mega-link {
  display: block;
  padding: calc(6.0/14 * 1rem) 0;
  font-size: calc(13.0/14 * 1rem);
  color: #000 !important;
  transition: color 0.2s;
  cursor: pointer;
}
.nav-item .mega-link:hover { color: #1565c0; }

/* ===== Right Side Float Toolbar ===== */
.float-toolbar {
  position: fixed;
  right: calc(20.0/14 * 1rem);
  top: 50%;
  transform: translateY(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: calc(8.0/14 * 1rem);
}
.float-btn {
  width: 4rem;
  height: 4rem;
  background: #1565c0;
  border-radius: calc(8.0/14 * 1rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: calc(11.0/14 * 1rem);
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
}
.float-btn:hover {
  background: #0d47a1;
  transform: scale(1.05);
}
.float-btn i { font-size: calc(20.0/14 * 1rem); margin-bottom: calc(2.0/14 * 1rem); }

.float-panel {
  position: absolute;
  right: calc(68.0/14 * 1rem);
  top: 50%;
  transform: translateY(-50%);
  background: #fff;
  box-shadow: 0 calc(4.0/14 * 1rem) calc(20.0/14 * 1rem) rgba(0,0,0,0.15);
  border-radius: calc(8.0/14 * 1rem);
  padding: calc(16.0/14 * 1rem);
  min-width: calc(200.0/14 * 1rem);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s;
}
.float-btn:hover .float-panel {
  opacity: 1;
  visibility: visible;
}
.float-panel .panel-title {
  font-size: 1rem;
  font-weight: bold;
  margin-bottom: calc(8.0/14 * 1rem);
  color: #333;
}
.float-panel .panel-info {
  font-size: calc(18.0/14 * 1rem);
  color: #1565c0;
  font-weight: bold;
}
.float-panel .qr-codes {
  display: flex;
  gap: calc(12.0/14 * 1rem);
}
.float-panel .qr-item { text-align: center; }
.float-panel .qr-item img { width: calc(100.0/14 * 1rem); height: calc(100.0/14 * 1rem); }
.float-panel .qr-item .qr-label { font-size: calc(12.0/14 * 1rem); color: #666; margin-top: calc(4.0/14 * 1rem); }

/* ===== Banner ===== */
.page-banner {
  width: 100%;
  height: 30rem;
  background-size: cover;
  background-position: center;
  position: relative;

}
.page-banner::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.35);
}
.banner-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: #fff;
  padding: 0 calc(40.0/14 * 1rem);
}
.banner-title { font-size: calc(36.0/14 * 1rem); font-weight: bold; margin-bottom: calc(12.0/14 * 1rem); }
.banner-subtitle { font-size: calc(16.0/14 * 1rem); opacity: 0.9; }

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: calc(16.0/14 * 1rem) 0;
  font-size: calc(13.0/14 * 1rem);
  color: #666;
}
.breadcrumb a { color: #1565c0; }
.breadcrumb .sep { margin: 0 calc(8.0/14 * 1rem); color: #999; }

/* ===== Footer ===== */
.main-footer {
  background: #1a1a2e;
  color: #fff;
  padding: calc(50.0/14 * 1rem) 0 calc(20.0/14 * 1rem);
}
.footer-inner {
  width: calc(1200.0/14 * 1rem);
  margin: 0 auto;
  padding: 0 calc(20.0/14 * 1rem);
}
.footer-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: calc(30.0/14 * 1rem);
}
.footer-links {
  display: flex;
  gap: calc(60.0/14 * 1rem);
  flex: 1;
}
.footer-col .footer-title {
  font-size: calc(15.0/14 * 1rem);
  font-weight: bold;
  margin-bottom: calc(16.0/14 * 1rem);
  color: #fff;
}
.footer-col .footer-link {
  display: block;
  font-size: calc(13.0/14 * 1rem);
  color: #aaa;
  margin-bottom: calc(10.0/14 * 1rem);
  transition: color 0.2s;
}
.footer-col .footer-link:hover { color: #fff; }
.footer-contact {
  width: calc(320.0/14 * 1rem);
}
.footer-contact-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: calc(12.0/14 * 1rem);
  font-size: calc(13.0/14 * 1rem);
  color: #aaa;
}
.footer-contact-item i { margin-right: calc(8.0/14 * 1rem); color: #1565c0; margin-top: calc(2.0/14 * 1rem); }
.footer-qr { display: flex; gap: calc(16.0/14 * 1rem); margin-top: calc(16.0/14 * 1rem); }
.footer-qr .qr-item { text-align: center; }
.footer-qr .qr-item img { width: calc(90.0/14 * 1rem); height: calc(90.0/14 * 1rem); background: #fff; border-radius: calc(4.0/14 * 1rem); }
.footer-qr .qr-item .qr-label { font-size: calc(12.0/14 * 1rem); color: #aaa; margin-top: calc(6.0/14 * 1rem); }
.footer-title-follow { margin-top: calc(20.0/14 * 1rem); }
.footer-qr-img { width: calc(80.0/14 * 1rem); height: calc(80.0/14 * 1rem); border-radius: calc(4.0/14 * 1rem); }
.footer-admin-link { margin-left: calc(20.0/14 * 1rem); }
.footer-admin-link a { color: #666; font-size: calc(12.0/14 * 1rem); text-decoration: none; }

.footer-bottom {
  border-top: 1px solid #333;
  padding-top: calc(16.0/14 * 1rem);
  text-align: center;
  font-size: calc(12.0/14 * 1rem);
  color: #666;
}

/* ===== Carousel ===== */
.carousel-section {
  position: relative;
  width: 100%;
  height: 40rem;
  overflow: hidden;

}
.carousel-track {
  display: flex;
  transition: transform 0.5s ease;
  height: 100%;
}
.carousel-slide {
  min-width: 100%;
  height: 100%;
  position: relative;
  background-size: cover;
  background-position: center;
}
.carousel-slide::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(to right, rgba(0,0,0,0.5) 0%, rgba(0,0,0,0.1) 60%, transparent 100%);
}
.carousel-content {
  position: absolute;
  left: 10%;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  color: #fff;
  max-width: calc(600.0/14 * 1rem);
}
.carousel-title { font-size: 3rem; font-weight: bold; margin-bottom: calc(16.0/14 * 1rem); line-height: 1.3; }
.carousel-subtitle { font-size: calc(18.0/14 * 1rem); margin-bottom: calc(30.0/14 * 1rem); opacity: 0.9; }
.carousel-btn {
  display: inline-block;
  padding: calc(12.0/14 * 1rem) calc(32.0/14 * 1rem);
  background: #1565c0;
  color: #fff;
  border-radius: calc(4.0/14 * 1rem);
  font-size: calc(15.0/14 * 1rem);
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}
.carousel-btn:hover { background: #0d47a1; }

.carousel-dots {
  position: absolute;
  bottom: calc(30.0/14 * 1rem);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: calc(10.0/14 * 1rem);
  z-index: 3;
}
.carousel-dot {
  width: calc(10.0/14 * 1rem);
  height: calc(10.0/14 * 1rem);
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: all 0.3s;
}
.carousel-dot.active { background: #fff; width: calc(30.0/14 * 1rem); border-radius: calc(5.0/14 * 1rem); }

.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: calc(50.0/14 * 1rem);
  height: calc(50.0/14 * 1rem);
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: calc(20.0/14 * 1rem);
  cursor: pointer;
  z-index: 3;
  transition: all 0.3s;
  border: none;
}
.carousel-arrow:hover { background: rgba(255,255,255,0.4); }
.carousel-arrow.prev { left: calc(30.0/14 * 1rem); }
.carousel-arrow.next { right: calc(30.0/14 * 1rem); }

/* ===== Section Title ===== */
.section-title {
  text-align: center;
  font-size: calc(32.0/14 * 1rem);
  font-weight: bold;
  color: #333;
  margin-bottom: calc(12.0/14 * 1rem);
}
.section-subtitle {
  text-align: center;
  font-size: calc(15.0/14 * 1rem);
  color: #666;
  margin-bottom: calc(40.0/14 * 1rem);
}

/* ===== Strategy Icons ===== */
.strategy-section { padding: calc(60.0/14 * 1rem) 0; background: #f8f9fa; }
.strategy-icons {
  display: flex;
  justify-content: center;
  gap: calc(50.0/14 * 1rem);
  flex-wrap: nowrap;
}
.strategy-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  transition: all 0.3s;
}
.strategy-item:hover { transform: translateY(calc(-5/14 * 1rem)); }
.strategy-item:hover .strategy-icon { background: #1565c0; color: #fff; }
.strategy-icon {
  width: calc(80.0/14 * 1rem);
  height: calc(80.0/14 * 1rem);
  border-radius: 50%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(32.0/14 * 1rem);
  color: #1565c0;
  box-shadow: 0 calc(4.0/14 * 1rem) calc(15.0/14 * 1rem) rgba(0,0,0,0.08);
  margin-bottom: calc(12.0/14 * 1rem);
  transition: all 0.3s;
}
.strategy-label { font-size: 1rem; color: #333; }

/* ===== Card Styles ===== */
.info-card {
  background: #fff;
  border-radius: calc(8.0/14 * 1rem);
  overflow: hidden;
  box-shadow: 0 calc(2.0/14 * 1rem) calc(12.0/14 * 1rem) rgba(0,0,0,0.06);
  transition: all 0.3s;
}
.info-card:hover {
  box-shadow: 0 calc(8.0/14 * 1rem) calc(30.0/14 * 1rem) rgba(0,0,0,0.12);
  transform: translateY(calc(-4/14 * 1rem));
}

/* ===== Product/Solution Cards ===== */
.product-section { padding: calc(60.0/14 * 1rem) 0; }
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(24.0/14 * 1rem);
}
.solution-card {
  position: relative;
  display: block;
  border-radius: calc(12.0/14 * 1rem);
  overflow: hidden;
  height: 20rem;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 calc(2.0/14 * 1rem) calc(12.0/14 * 1rem) rgba(0,0,0,0.08);
}
.solution-card:hover {
  transform: translateY(calc(-4/14 * 1rem));
  box-shadow: 0 calc(12.0/14 * 1rem) calc(40.0/14 * 1rem) rgba(0,0,0,0.18);
}
.solution-card-img {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: #e8f0f8;
}
.solution-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.solution-card:hover .solution-card-img img { transform: scale(1.08); }
.solution-card-body {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: calc(80.0/14 * 1rem) calc(20.0/14 * 1rem) calc(20.0/14 * 1rem);
  background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.3) 50%, transparent 100%);
  text-align: left;
}
.solution-card-title { font-size: calc(16.0/14 * 1rem); font-weight: bold; color: #fff; margin-bottom: calc(8.0/14 * 1rem); }
.solution-card-tag {
  display: inline-flex;
  align-items: center;
  gap: calc(6.0/14 * 1rem);
  font-size: calc(13.0/14 * 1rem);
  color: rgba(255,255,255,0.9);
  transition: gap 0.3s;
}

/* ===== News Section ===== */
.news-section { padding: calc(60.0/14 * 1rem) 0; background: #f8f9fa; }
.news-grid { display: flex; gap: calc(30.0/14 * 1rem); }
.news-headline {
  flex: 1;
  position: relative;
  border-radius: calc(8.0/14 * 1rem);
  overflow: hidden;
  width: 100%;
  height: 20rem;
}
.news-headline img { width: 100%; height: 100%; object-fit: cover; }
.news-headline-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: calc(40.0/14 * 1rem) calc(24.0/14 * 1rem) calc(24.0/14 * 1rem);
  background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 100%);
  color: #fff;
}
.news-headline-title { font-size: calc(18.0/14 * 1rem); font-weight: bold; margin-bottom: calc(8.0/14 * 1rem); }
.news-headline-date { font-size: calc(13.0/14 * 1rem); color: rgba(255,255,255,0.7); }

.news-list { flex: 1; }
.news-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: calc(16.0/14 * 1rem) 0;
  border-bottom: 1px solid #eee;
  cursor: pointer;
  transition: all 0.2s;
}
.news-item:hover { color: #1565c0; }
.news-item-title { flex: 1; font-size: 1rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-right: calc(16.0/14 * 1rem); }
.news-item-date { font-size: calc(13.0/14 * 1rem); color: #999; white-space: nowrap; }

/* ===== Stats Section ===== */
.stats-section {
  padding: calc(60.0/14 * 1rem) 0;
  background: linear-gradient(135deg, #f0f4f8 0%, #e8eef5 100%);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: calc(40.0/14 * 1rem);
  margin-top: calc(40.0/14 * 1rem);
}
.stat-item { text-align: center; }
.stat-number {
  font-size: calc(52.0/14 * 1rem);
  font-weight: bold;
  color: #1565c0;
  line-height: 1.2;
}
.stat-label { font-size: calc(16.0/14 * 1rem); color: #333; margin-top: calc(8.0/14 * 1rem); }
.stat-desc { font-size: calc(13.0/14 * 1rem); color: #666; margin-top: calc(4.0/14 * 1rem); }

/* ===== Tabs ===== */
.tab-nav {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-bottom: calc(30.0/14 * 1rem);
  border-bottom: calc(2.0/14 * 1rem) solid #e8ecf1;
}
.tab-item {
  padding: calc(12.0/14 * 1rem) calc(24.0/14 * 1rem);
  font-size: 1rem;
  color: #666;
  cursor: pointer;
  transition: all 0.2s;
  border-bottom: calc(2.0/14 * 1rem) solid transparent;
  margin-bottom: calc(-2/14 * 1rem);
}
.tab-item:hover { color: #1565c0; }
.tab-item.active {
  color: #1565c0;
  border-bottom-color: #1565c0;
  font-weight: bold;
}

/* ===== About Page ===== */
.about-page { display: flex; gap: calc(40.0/14 * 1rem); margin-top: 5rem; }
.about-sidebar {
  width: calc(220.0/14 * 1rem);
  flex-shrink: 0;
  position: sticky;
  top: calc(90.0/14 * 1rem);
  height: fit-content;
}
.about-nav-item {
  padding: 1rem calc(20.0/14 * 1rem);
  font-size: 1rem;
  color: #555;
  cursor: pointer;
  transition: all 0.2s;
  border-left: calc(3.0/14 * 1rem) solid transparent;
}
.about-nav-item:hover, .about-nav-item.active {
  color: #1565c0;
  background: #f0f5fb;
  border-left-color: #1565c0;
}
.about-content { flex: 1; padding: calc(40.0/14 * 1rem) 0; }
.about-section { margin-bottom: calc(60.0/14 * 1rem); }
.about-section h2 { font-size: 2rem; margin-bottom: calc(20.0/14 * 1rem); color: #333; }
.about-section p { font-size: calc(15.0/14 * 1rem); color: #555; line-height: 1.8; margin-bottom: calc(16.0/14 * 1rem); }

/* ===== Timeline ===== */
.timeline-wrapper { position: relative; overflow: hidden; }
.timeline-nav {
  display: flex;
  align-items: center;
  gap: calc(20.0/14 * 1rem);
  margin-bottom: calc(30.0/14 * 1rem);
}
.timeline-arrow {
  width: calc(36.0/14 * 1rem);
  height: calc(36.0/14 * 1rem);
  border-radius: 50%;
  background: #1565c0;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: none;
  transition: all 0.3s;
}
.timeline-arrow:hover { background: #0d47a1; }
.timeline-years {
  display: flex;
  gap: calc(30.0/14 * 1rem);
  overflow-x: auto;
  padding: calc(10.0/14 * 1rem) 0;
}
.timeline-year {
  padding: calc(8.0/14 * 1rem) calc(16.0/14 * 1rem);
  font-size: 1rem;
  color: #666;
  cursor: pointer;
  white-space: nowrap;
  border-radius: calc(4.0/14 * 1rem);
  transition: all 0.2s;
}
.timeline-year:hover, .timeline-year.active {
  color: #1565c0;
  background: #f0f5fb;
}
.timeline-events { padding: calc(20.0/14 * 1rem); background: #f8f9fa; border-radius: calc(8.0/14 * 1rem); }
.timeline-event { padding: calc(10.0/14 * 1rem) 0; font-size: 1rem; color: #555; }

/* ===== Grid Cards ===== */
.grid-cards-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: calc(24.0/14 * 1rem);
}
.grid-cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(24.0/14 * 1rem);
}
.grid-cards-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: calc(24.0/14 * 1rem);
}

/* ===== Cards ===== */
.text-card {
  padding: calc(30.0/14 * 1rem);
  background: #fff;
  border-radius: calc(8.0/14 * 1rem);
  box-shadow: 0 calc(2.0/14 * 1rem) calc(12.0/14 * 1rem) rgba(0,0,0,0.06);
}
.text-card h3 { font-size: calc(18.0/14 * 1rem); color: #1565c0; margin-bottom: calc(12.0/14 * 1rem); }
.text-card p { font-size: 1rem; color: #555; line-height: 1.7; }

/* ===== Contact Form ===== */
.contact-section { padding: calc(60.0/14 * 1rem) 0; margin-top: 5rem; }
.contact-grid { display: flex; gap: calc(60.0/14 * 1rem); }
.contact-form { flex: 1; }
.contact-info { width: calc(380.0/14 * 1rem); }
.form-group { margin-bottom: calc(20.0/14 * 1rem); }
.form-group label {
  display: block;
  font-size: 1rem;
  color: #333;
  margin-bottom: calc(8.0/14 * 1rem);
  font-weight: bold;
}
.form-group label .required { color: #e53935; margin-left: calc(4.0/14 * 1rem); }
.form-group input,
.form-group textarea {
  width: 100%;
  padding: calc(12.0/14 * 1rem) calc(16.0/14 * 1rem);
  border: 1px solid #ddd;
  border-radius: calc(4.0/14 * 1rem);
  font-size: 1rem;
  transition: border-color 0.3s;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #1565c0;
}
.form-group textarea { resize: vertical; min-height: calc(120.0/14 * 1rem); }
.submit-btn {
  padding: 1rem calc(48.0/14 * 1rem);
  background: #1565c0;
  color: #fff;
  border: none;
  border-radius: calc(4.0/14 * 1rem);
  font-size: calc(15.0/14 * 1rem);
  cursor: pointer;
  transition: all 0.3s;
}
.submit-btn:hover { background: #0d47a1; }

/* ===== Pagination ===== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: calc(8.0/14 * 1rem);
  margin-top: calc(30.0/14 * 1rem);
}
.page-btn {
  padding: calc(8.0/14 * 1rem) 1rem;
  border: 1px solid #ddd;
  background: #fff;
  border-radius: calc(4.0/14 * 1rem);
  font-size: calc(13.0/14 * 1rem);
  color: #555;
  cursor: pointer;
  transition: all 0.2s;
}
.page-btn:hover, .page-btn.active {
  background: #1565c0;
  color: #fff;
  border-color: #1565c0;
}
.page-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== Filter Bar ===== */
.filter-bar {
  display: flex;
  flex-wrap: nowrap;
  gap: calc(16.0/14 * 1rem);
  padding: calc(20.0/14 * 1rem);
  background: #f8f9fa;
  border-radius: calc(8.0/14 * 1rem);
  margin-bottom: calc(24.0/14 * 1rem);
}
.filter-group { display: flex; align-items: center; gap: calc(8.0/14 * 1rem); }
.filter-group label { font-size: calc(13.0/14 * 1rem); color: #666; white-space: nowrap; }
.filter-group select,
.filter-group input {
  padding: calc(8.0/14 * 1rem) calc(12.0/14 * 1rem);
  border: 1px solid #ddd;
  border-radius: calc(4.0/14 * 1rem);
  font-size: calc(13.0/14 * 1rem);
}

/* ===== Video Card ===== */
.video-card {
  position: relative;
  border-radius: calc(8.0/14 * 1rem);
  overflow: hidden;
  cursor: pointer;
}
.video-card img { width: 100%; height: calc(180.0/14 * 1rem); object-fit: cover; }
.video-card .play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: calc(60.0/14 * 1rem);
  height: calc(60.0/14 * 1rem);
  background: rgba(21, 101, 192, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: calc(24.0/14 * 1rem);
}
.video-card-title {
  padding: calc(12.0/14 * 1rem);
  font-size: 1rem;
  color: #333;
  background: #fff;
}

/* ===== Fixed Layout ===== */
/* 页面使用固定宽度布局，不随分辨率变化或浏览器缩放重排 */
/* 当视口小于 calc(1440.0/14 * 1rem) 时，页面出现横向滚动条，布局保持不变 */


/* ===== Loading ===== */
.loading-spinner {
  display: inline-block;
  width: calc(20.0/14 * 1rem);
  height: calc(20.0/14 * 1rem);
  border: calc(2.0/14 * 1rem) solid #f3f3f3;
  border-top: calc(2.0/14 * 1rem) solid #1565c0;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* ===== Element UI Override ===== */
.el-dialog__body { padding: calc(20.0/14 * 1rem); }
.el-table th { background: #f5f7fa; font-weight: bold; }

/* ===== Animation ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(calc(30.0/14 * 1rem)); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}