:root {
  --bg: #0f0f10;
  --card-bg: #121316;
  --text: #e8e8ea;
  --muted: #a1a1a6;
  --brand: #2f80ed;
  --brand-2: #7f5af0;
}
* {
  box-sizing: border-box;
}
html, body {
  height: 100%;
}
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  min-height: 100vh;
  background: linear-gradient(180deg, #0d0f12 0%, #0f0f10 100%) fixed,
              radial-gradient(1400px 900px at 10% -10%, #1b1c1f, transparent) fixed,
              radial-gradient(1200px 700px at 90% -20%, #15161a, transparent) fixed;
  background-repeat: no-repeat;
  background-color: var(--bg);
}
.tabs {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding: 10px 20px;
  background: rgba(16,16,18,0.55);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.tabs-inner {
  display: flex;
  flex-wrap: nowrap;
  gap: 10px;
  align-items: center;
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Firefox */
}
.tabs-inner::-webkit-scrollbar {
  display: none; /* Safari and Chrome */
}
.tabs.is-fixed {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
}
/* spacer不再需要固定高度，默认0 */
.tabs-spacer { height: 0; }
.tab {
  appearance: none;
  border: none;
  margin: 0;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
}
.tab:hover {
  background: rgba(255,255,255,0.1);
}
.tab.active {
  background: linear-gradient(90deg, rgba(47,128,237,0.9), rgba(127,90,240,0.9));
}

.site-logo {
  display: block;
  width: 80px;
  height: 80px;
  margin: 0 auto 12px;
}
.site-header {
  padding: 28px 20px 10px;
  text-align: center;
}
.site-title {
  margin: 0;
  font-size: 28px;
  letter-spacing: 0.5px;
}
.site-subtitle {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.hero-section {
  position: relative;
  padding: 60px 20px;
  margin: 0 auto 20px;
  max-width: 1160px;
  border-radius: 16px;
  overflow: hidden;
  background: url('images/hero-background.jpg') center/cover no-repeat;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero-title {
  margin: 0 0 16px;
  font-size: 26px;
  font-weight: 700;
  color: #fff;
}

.hero-text {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.9);
}
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 20px;
}
.category + .category {
  margin-top: 28px;
}
.category {
  scroll-margin-top: 76px;
}
.category-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  align-items: start;
  margin: 0 0 12px;
}
.category-meta {
  position: relative;
  padding-left: 10px;
}
.category-meta::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: linear-gradient(180deg, var(--brand), var(--brand-2));
  border-radius: 2px;
}
.is-hidden {
  display: none;
}
.category-title {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 600;
}
.category-head .category-title {
  font-size: 22px;
}
.category-subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.category-desc {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
  text-align: left !important;
  justify-self: start;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}
.card {
  position: relative;
  display: block;
  border-radius: 14px;
  overflow: hidden;
  background: var(--card-bg);
  aspect-ratio: 9/16;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 40%, rgba(0,0,0,0.6) 80%, rgba(0,0,0,0.85) 100%);
  pointer-events: none;
  z-index: 0;
}
.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transform: scale(1.001);
  transition: transform 0.35s ease, filter 0.35s ease;
}
.card-label {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px;
  border-radius: 0;
  background: transparent;
  color: #fff;
  letter-spacing: 0.2px;
  z-index: 1;
}
.card-label .label-title {
  display: block;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.card-label .label-subtitle {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: rgba(255,255,255,0.9);
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.card:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
}
.card:hover .card-img {
  transform: scale(1.03);
  filter: brightness(1.02);
}
.download-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(20,20,22,0.55);
  color: #fff;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 1;
  transform: none;
  transition: opacity 0.2s ease, transform 0.2s ease, background 0.2s ease;
}
.download-btn:hover {
  background: rgba(30,30,34,0.7);
}
/* 始终显示下载按钮，不依赖悬浮或首次点击 */
.site-footer {
  margin-top: 26px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.footer-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 16px 20px 28px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}
.footer-actions {
  margin-top: 10px;
}
.footer-btn {
  appearance: none;
  border: none;
  padding: 9px 16px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(47,128,237,0.9), rgba(127,90,240,0.9));
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
}
.footer-btn:hover {
  filter: brightness(1.05);
}
.float-service-btn {
  position: fixed;
  right: 16px;
  bottom: 100px;
  z-index: 999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: rgba(47, 128, 237, 0.7);
  color: white;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(47, 128, 237, 0.25);
  display: none;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.float-service-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(47, 128, 237, 0.35);
  background: rgba(47, 128, 237, 0.85);
}

.float-service-btn:active {
  transform: translateY(0);
}

.float-service-btn svg {
  width: 20px;
  height: 20px;
  opacity: 0.9;
}

.float-service-btn:hover svg {
  opacity: 1;
}

@media (max-width: 768px) {
  .float-service-btn {
    display: flex;
  }
  
  .pc-service-sidebar {
    display: none;
  }
}

/* PC端右侧客服信息样式 */
.pc-service-sidebar {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  width: 180px;
}

.service-card {
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(18, 19, 22, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  overflow: hidden;
}

.service-title {
  margin: 0;
  padding: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.05);
  text-align: center;
}

.service-content {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.service-qr {
  width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.service-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-line {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.service-line .label {
  font-size: 11px;
  color: var(--muted);
  font-weight: 500;
}

.service-line .value {
  font-size: 12px;
  color: var(--text);
  text-decoration: none;
  line-height: 1.3;
}

.service-line .value:hover {
  color: var(--brand);
}

.contact-modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 50;
}
.contact-modal.open {
  display: flex;
}
.contact-card {
  width: 720px;
  max-width: 100%;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.08);
  background: var(--card-bg);
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
}
.contact-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.contact-title {
  margin: 0;
  font-size: 18px;
}
.contact-close {
  appearance: none;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(255,255,255,0.08);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}
.contact-content {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 16px;
  padding: 16px;
}
.contact-qr {
  width: 100%;
  height: auto;
  border-radius: 12px;
  background: #0e0f12;
}
.contact-info {
  display: grid;
  gap: 10px;
  align-content: start;
}
.contact-line {
  display: flex;
  gap: 10px;
}
.contact-line .label {
  color: var(--muted);
}
.no-scroll {
  overflow: hidden;
}
@media (max-width: 768px) {
  .tabs {
    gap: 8px;
    padding: 8px 12px;
    overflow-x: visible;
  }
  .tabs-spacer { height: 0; }
  .category { scroll-margin-top: 92px; }
  .tab {
    flex: 0 0 auto;
    font-size: 13px;
    padding: 7px 12px;
  }
  .site-title {
    font-size: 24px;
  }
  .hero-section {
    padding: 40px 20px;
    margin: 0 12px 20px;
  }
  .hero-title {
    font-size: 22px;
  }
  .hero-text {
    font-size: 14px;
  }
  .category-title {
    font-size: 16px;
  }
  .card-grid {
    gap: 12px;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }
  .category-head {
    grid-template-columns: 1fr;
    gap: 8px;
    align-items: start;
  }
  .card-label {
    padding: 10px 12px;
  }
  .card-label .label-title {
    font-size: 13px;
  }
  .card-label .label-subtitle {
    font-size: 12px;
  }
  .download-btn {
    opacity: 1;
    transform: none;
  }
  .contact-content {
    grid-template-columns: 1fr;
  }
  .contact-card-header {
    padding: 12px 14px;
  }
}
@media (min-width: 1280px) {
  .container, .footer-inner { max-width: 1320px; }
}