* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  background: #dfeaf6;
  color: #1f1f1f;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #dfeaf6;
}

.root {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 991px) minmax(0px, 1fr);
  width: 100%;
  height: 100vh;
}

.browser-shell {
  position: relative;
  width: 100%;
  max-width: 1280px;
  height: 100vh;
  background: #f3f3f3;
  border: 1px solid rgba(215, 215, 215, 0.7);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.right-shell:after {
  display: block;
  content: "";
  width: 100%;
  height: 100%;
}

.mobile-ad {
  display: none;
}

body.mobile-prompt-open {
  overflow: hidden;
}

.content-split {
  display: flex;
  flex: 1;
  position: relative;
  z-index: 1;
  min-height: 0;
}

.content-panel {
  flex: 1;
  min-width: 0;
  background: rgba(255, 255, 255, 0.88);
}

.browser-shell > * {
  position: relative;
  z-index: 1;
}

.browser-toolbar {
  height: 52px;
  background: #f5f5f5;
  border-bottom: 1px solid #dcdcdc;
  display: flex;
  align-items: center;
  padding: 0 18px;
  gap: 14px;
}

.nav-icons {
  display: flex;
  align-items: center;
  gap: 16px;
  color: #7c7c7c;
  font-size: 20px;
}

.address-bar {
  flex: 1;
  height: 32px;
  background: #f7f7f7;
  border: 1px solid #d9d9d9;
  border-radius: 16px;
  display: flex;
  align-items: center;
  padding: 0 16px;
  color: #5d5d5d;
  font-size: 14px;
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #666;
}

.toolbar-actions span {
  display: inline-flex;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid #b7b7b7;
  align-items: center;
  justify-content: center;
  font-size: 11px;
}

.page {
  flex: 1;
  background: rgba(255, 255, 255, 0.88);
  padding: 20px 18px 16px;
}

.app-header {
  max-width: 1180px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.65);
  border-radius: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
  padding-right: 20px;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #4da1ff 0%, #1f64e8 100%);
  position: relative;
  overflow: hidden;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
}

.brand-mark::before {
  width: 12px;
  height: 12px;
  left: 6px;
  top: 7px;
}

.brand-mark::after {
  width: 8px;
  height: 8px;
  right: 6px;
  bottom: 7px;
}

.brand-name {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 1px;
}

.main-nav {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 24px;
  padding-left: 26px;
}

.nav-tab {
  position: relative;
  color: #2d2d2d;
  font-size: 18px;
  font-weight: 500;
  padding: 8px 6px;
  cursor: default;
}

.nav-tab.active {
  color: #1e5fe4;
}

.nav-tab.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 3px;
  border-radius: 3px;
  background: #1b62e8;
}

.nav-tab.small {
  font-size: 16px;
  color: #4b4b4b;
}

.search-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-box {
  width: 330px;
  height: 42px;
  background: rgba(214, 228, 255, 0.4);
  border: 1px solid #d8e3ff;
  border-radius: 10px;
  padding: 0 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: #8f9cb6;
}

.search-box input {
  border: 0;
  outline: none;
  background: transparent;
  flex: 1;
  font-size: 14px;
  color: #444;
}

.download-btn {
  height: 42px;
  padding: 0 18px;
  border: none;
  background: linear-gradient(180deg, #1a66ff 0%, #0c5ae3 100%);
  color: white;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 8px 20px rgba(26, 102, 255, 0.24);
}

.content {
  max-width: 1180px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  gap: 24px;
  min-height: 0;
}

.sidebar {
  width: 195px;
  display: block;
  padding-top: 6px;
}

.category-box {
  padding-left: 4px;
}

.category-title {
  font-size: 13px;
  color: #6d6d6d;
  margin: 10px 0 14px;
}

.category-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.category-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px 8px 6px;
  color: #3d3d3d;
  border-radius: 8px;
  font-size: 15px;
}

.category-item .icon {
  width: 16px;
  height: 16px;
  background: linear-gradient(135deg, #e6e6e6, #cfcfcf);
  border-radius: 4px;
  opacity: 0.8;
}

.category-item .count {
  margin-left: auto;
  color: #7b7b7b;
  font-size: 12px;
}

.main-panel {
  flex: 1;
  min-width: 0;
  width: 100%;
}

.toolbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2px;
}

.sort-box {
  position: relative;
  width: 140px;
}

.sort-toggle {
  width: 100%;
  height: 36px;
  border: 1px solid #d4d7dc;
  background: #f7f7f7;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #5e6471;
  font-size: 14px;
  padding: 0 14px;
  cursor: pointer;
  position: relative;
  outline: none;
}

.sort-toggle:focus {
  border-color: #a9c7ff;
  box-shadow: 0 0 0 3px rgba(68, 124, 255, 0.12);
}

.sort-toggle span {
  flex: 1;
  text-align: center;
}

.sort-toggle::after {
  content: "▾";
  font-size: 12px;
  color: #5a6170;
}

.sort-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: 140px;
  background: #ffffff;
  border: 1px solid #dfe5ee;
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.08);
  display: none;
  overflow: hidden;
  z-index: 10;
}

.sort-box.open .sort-menu {
  display: block;
}

.sort-option {
  width: 100%;
  border: none;
  background: transparent;
  color: #4d5460;
  font-size: 14px;
  text-align: left;
  padding: 10px 12px;
  cursor: pointer;
}

.sort-option:hover {
  background: #f3f7ff;
}

.sort-option.active {
  background: #eaf2ff;
  color: #1a67f6;
  font-weight: 600;
}

.items-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(215px, 1fr));
  gap: 20px 24px;
  padding: 8px 6px 12px;
}

.item-card {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid #e9ebee;
  border-radius: 12px;
  padding: 1.2rem 16px;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease;
}

.item-card:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.04);
}

.item-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.item-title {
  width: 100%;
  font-size: 15px;
  color: #2a2a2a;
  text-align: center;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rating {
  font-size: 12px;
  color: #f0b12b;
  letter-spacing: 1px;
  white-space: nowrap;
}

.item-tag {
  display: inline-block;
  margin-top: 6px;
  font-size: 13px;
  color: #1d6bff;
  background: rgba(32, 118, 255, 0.08);
  border-radius: 8px;
  width: 100%;
  text-align: center;
  padding: 10px 8px;
  text-decoration: none;
  transition: all 0.125s linear;
}

.item-tag:hover {
  background: #1d6bff;
  color: #fff;
  opacity: 0.9;
}

@media (max-width: 1439px) {
  .root {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1280px) minmax(0, 1fr);
  }

  .right-shell {
    display: none;
  }

  .mobile-ad {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(12, 24, 43, 0.78);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
  }
}

@media (max-width: 1080px) {
  .items-grid {
    grid-template-columns: repeat(4, minmax(150px, 1fr));
  }
}

@media (max-width: 900px) {
  body {
    align-items: flex-start;
  }

  .page {
    padding: 12px 10px 14px;
  }

  .browser-shell {
    max-width: 100%;
    min-height: 100vh;
    height: auto;
  }

  .content {
    width: 100%;
    max-width: none;
  }

  .sidebar {
    display: none;
  }
  .app-header {
    flex-wrap: wrap;
    margin-bottom: 12px;
    gap: 10px;
  }
  .main-nav {
    order: 3;
    width: 100%;
    padding-left: 0;
    gap: 14px;
  }
  .nav-tab {
    font-size: 15px;
  }
  .search-wrap {
    width: 100%;
    justify-content: flex-end;
    gap: 8px;
    flex-wrap: wrap;
  }
  .search-box {
    width: 100%;
    min-width: 0;
  }
  .items-grid {
    grid-template-columns: repeat(2, minmax(140px, 1fr));
    gap: 14px 12px;
  }
}

@media (max-width: 540px) {
  html,
  body {
    height: auto;
    min-height: 100%;
  }

  body {
    display: block;
  }

  .root {
    display: block;
    height: auto;
    min-height: 100vh;
  }

  .left-shell,
  .right-shell {
    display: none;
  }

  .browser-shell {
    border: none;
    box-shadow: none;
    min-height: 100vh;
    height: auto;
  }

  .app-header {
    align-items: stretch;
  }

  .main-nav {
    justify-content: space-between;
  }

  .search-wrap {
    flex-direction: column;
    align-items: stretch;
  }

  .search-box,
  .sort-box {
    width: 100%;
  }

  .items-grid {
    grid-template-columns: 1fr;
    gap: 12px;
    width: 100%;
  }

  .item-card {
    min-height: 120px;
    padding: 14px 12px 12px;
    width: 100%;
  }

  .contact-us-btn {
    bottom: 30px;
    right: 30px;
  }
}

/* 联系我们按钮样式 */
.contact-us-btn {
  position: fixed;
  top: 50%;
  bottom: auto;
  right: 0;
  width: 50px;
  height: 159px;
  box-sizing: border-box;
  background: #238def;
  border-radius: 20px 0 0 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-decoration: none;
  box-shadow: 0 12px 28px rgba(35, 104, 174, 0.22);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  z-index: 100;
  cursor: pointer;
  flex-direction: column;
  padding: 0;
  transform: translateY(-50%);
}

.contact-us-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  width: 100%;
  height: 100%;
  justify-content: center;
}

.contact-us-status {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  margin-bottom: 2px;
  background: #ff4b55;
  border-radius: 50%;
}

.contact-us-bubble {
  width: 28px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-us-bubble svg {
  width: 28px;
  height: 24px;
  color: #fff;
}

.contact-us-text {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
  letter-spacing: 1px;
}

.contact-us-btn:hover {
  transform: translate(-4px, -50%);
  box-shadow: 0 14px 32px rgba(35, 104, 174, 0.3);
}

.contact-us-btn:active {
  transform: translate(-2px, -50%) scale(0.98);
}

.contact-us-btn:focus-visible {
  outline: 3px solid rgba(255, 255, 255, 0.95);
  outline-offset: -5px;
}

@media (max-width: 768px) {
  .contact-us-btn {
    width: 46px;
    height: 146px;
    right: 0;
    border-radius: 18px 0 0 18px;
  }

  .contact-us-text {
    font-size: 18px;
  }
}