:root {
  --bg-light: #f4f5f7; --bg-dark: #121212; --text-light: #111; --text-dark: #f1f1f1;
  --text-muted-light: #555; --text-muted-dark: #aaa; --accent: #007aff;
  --glass-bg-light: rgba(255, 255, 255, 0.65); --glass-bg-dark: rgba(28, 28, 30, 0.75);
  --border-light: rgba(0, 0, 0, 0.1); --border-dark: rgba(255, 255, 255, 0.15);
  --input-bg-light: #e9e9eb; --input-bg-dark: #2c2c2e;
  --dropdown-bg-light: #ffffff; --dropdown-bg-dark: #2c2c2e;
  --dropdown-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
  --card-bg-dark: #1c1c1e;
}
body { display: flex; flex-direction: column; min-height: 100vh; margin: 0; padding-top: 65px; background-color: var(--bg-light); color: var(--text-light); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif; transition: background-color 0.3s ease, color 0.3s ease; }
body.dark { background-color: var(--bg-dark); color: var(--text-dark); }
body.mobile-nav-active { overflow: hidden; }
main { flex-grow: 1; }

header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; height: 65px; background-color: var(--glass-bg-light); border-bottom: 1px solid var(--border-light); backdrop-filter: blur(14px) saturate(180%); -webkit-backdrop-filter: blur(14px) saturate(180%); transition: background-color 0.3s ease, border-bottom 0.3s ease; }
body.dark header { background-color: var(--glass-bg-dark); border-bottom: 1px solid var(--border-dark); }
.header-left, .header-right { display: flex; align-items: center; gap: 24px; }
.logo-link { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; flex-shrink: 0; }
.logo-img { height: 32px; }
header h1 { margin: 0; font-weight: 700; font-size: 1.6rem; color: var(--text-light); white-space: nowrap; transition: color 0.3s ease; }
body.dark header h1 { color: var(--text-dark); }

#mainNav { display: flex; height: 100%; list-style: none; margin: 0; padding: 0; gap: 24px; }
#productsNav { display: flex; height: 100%; list-style: none; margin: 0; padding: 0; }

.search-form { position: relative; display: flex; align-items: center; }
.search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--text-muted-light); pointer-events: none; }
body.dark .search-icon { color: var(--text-muted-dark); }
#searchInput { width: 100%; max-width: 280px; height: 40px; border: 1px solid transparent; border-radius: 10px; padding: 0 16px 0 40px; background-color: var(--input-bg-light); color: var(--text-light); font-size: 0.95rem; outline: none; transition: all 0.2s ease; -webkit-appearance: none; }
body.dark #searchInput { background-color: var(--input-bg-dark); color: var(--text-dark); }
#searchInput:focus { background-color: transparent; border-color: var(--border-light); }
body.dark #searchInput:focus { border-color: var(--border-dark); }

.nav-group { position: relative; display: flex; align-items: center; }
.group-btn { display: flex; align-items: center; gap: 5px; padding: 0 8px; height: 100%; border: none; background: transparent; color: var(--text-light); font-size: 1rem; font-weight: 500; cursor: pointer; transition: color 0.2s; white-space: nowrap; }
body.dark .group-btn { color: var(--text-dark); }
.group-btn::after { content: '▾'; font-size: 0.8em; opacity: 0.6; transition: transform 0.2s ease; }
.group-btn.active, .nav-group:hover .group-btn { color: var(--accent); }
.nav-group:hover .group-btn::after { transform: rotate(180deg); }

.category-list { position: absolute; top: 95%; left: 50%; padding: 8px; margin: 0; min-width: 160px; background: var(--dropdown-bg-light); border-radius: 12px; box-shadow: var(--dropdown-shadow); list-style: none; z-index: 1001; opacity: 0; visibility: hidden; transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s; transform: translateX(-50%) translateY(-10px); display: flex; flex-direction: column; gap: 4px; }
body.dark .category-list { background: var(--dropdown-bg-dark); }
.nav-group:hover .category-list { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.category-list li { width: 100%; }
.category-btn { display: block; box-sizing: border-box; width: 100%; padding: 10px 16px; text-align: left; border: none; background: transparent; color: var(--text-light); border-radius: 8px; cursor: pointer; font-size: 0.95rem; transition: color 0.2s, background-color 0.2s; text-decoration: none; }
body.dark .category-btn { color: var(--text-dark); }
.category-btn.active, .category-btn:hover { background-color: var(--accent); color: white !important; }

.header-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
#themeToggle { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; background-color: transparent; border: 1px solid var(--border-light); border-radius: 10px; cursor: pointer; color: var(--text-muted-light); transition: all 0.2s ease; }
body.dark #themeToggle { border-color: var(--border-dark); color: var(--text-muted-dark); }
#themeToggle:hover { color: var(--accent); border-color: var(--accent); }
#themeToggle .sun-icon { display: block; }
#themeToggle .moon-icon { display: none; }
body.dark #themeToggle .sun-icon { display: none; }
body.dark #themeToggle .moon-icon { display: block; }

.mobile-nav-toggle-btn { display: none; align-items: center; justify-content: center; width: 40px; height: 40px; background-color: transparent; border: 1px solid var(--border-light); border-radius: 10px; cursor: pointer; color: var(--text-light); }
body.dark .mobile-nav-toggle-btn { border-color: var(--border-dark); color: var(--text-dark); }

main { padding: 20px; max-width: 1800px; margin: 0 auto; width: 100%; box-sizing: border-box; }

#gallery { display: flex; gap: 20px; }
.gallery-column { display: flex; flex-direction: column; gap: 20px; flex: 1; }
.gallery-item { line-height: 0; }
#gallery img { width: 100%; height: auto; display: block; cursor: pointer; border-radius: 12px; background-color: var(--border-light); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08); transition: transform 0.3s ease, box-shadow 0.3s ease; }
body.dark #gallery img { background-color: var(--card-bg-dark); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3); }
.gallery-item:hover img { transform: scale(1.02); box-shadow: 0 10px 25px rgba(0,0,0,0.12); }
body.dark .gallery-item:hover img { box-shadow: 0 10px 25px rgba(0,0,0,0.4); }

#mobileNavOverlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.5); z-index: 1050; opacity: 0; visibility: hidden; transition: opacity 0.3s ease, visibility 0.3s; }
#mobileNavOverlay.open { opacity: 1; visibility: visible; }
#mobileNavContainer { position: fixed; top: 0; left: 0; width: 280px; height: 100%; background-color: var(--bg-light); z-index: 1060; transform: translateX(-100%); transition: transform 0.3s ease-in-out; display: flex; flex-direction: column; }
body.dark #mobileNavContainer { background-color: var(--card-bg-dark); }
#mobileNavContainer.open { transform: translateX(0); }
.mobile-nav-header { display: flex; justify-content: space-between; align-items: center; padding: 0 20px; height: 65px; border-bottom: 1px solid var(--border-light); flex-shrink: 0; }
body.dark .mobile-nav-header { border-bottom: 1px solid var(--border-dark); }
.mobile-nav-title { font-size: 1.2rem; font-weight: 600; }
#mobileNavCloseBtn { font-size: 2.5rem; line-height: 1; border: none; background: transparent; color: var(--text-muted-light); cursor: pointer; padding: 0; }
body.dark #mobileNavCloseBtn { color: var(--text-muted-dark); }
#mobileNavContent { overflow-y: auto; padding: 15px 0; }
#mobileNavContent ul { list-style: none; padding: 0; margin: 0; }
#mobileNavContent .mobile-nav-group-btn { display: flex; justify-content: space-between; align-items: center; width: 100%; padding: 15px 20px; border: none; background: transparent; text-align: left; font-size: 1rem; font-weight: 500; cursor: pointer; color: var(--text-light); }
body.dark #mobileNavContent .mobile-nav-group-btn { color: var(--text-dark); }
#mobileNavContent .mobile-nav-group-btn.active { color: var(--accent); }
#mobileNavContent .mobile-nav-group-btn::after { content: '›'; font-size: 1.2rem; opacity: 0.6; transition: transform 0.2s ease; }
#mobileNavContent .mobile-nav-group-btn.expanded::after { transform: rotate(90deg); }
#mobileNavContent .mobile-category-list { padding-left: 20px; max-height: 0; overflow: hidden; transition: max-height 0.3s ease-in-out; }
#mobileNavContent .mobile-category-list.expanded { max-height: 500px; }
#mobileNavContent .mobile-category-btn { display: block; width: 100%; padding: 12px 20px; font-size: 0.95rem; text-align: left; background: transparent; border: none; border-radius: 0; cursor: pointer; color: var(--text-muted-light); }
body.dark #mobileNavContent .mobile-category-btn { color: var(--text-muted-dark); }
#mobileNavContent .mobile-category-btn.active { color: var(--accent); font-weight: 600; background-color: rgba(0, 122, 255, 0.1); }

@media (max-width: 1024px) {
  .header-left { gap: 16px; }
  #mainNav, #productsNav { display: none; }
  .mobile-nav-toggle-btn { display: flex; }
}
@media (max-width: 600px) {
  header { padding: 0 16px; }
  .header-right { gap: 16px; }
  #searchInput { max-width: 150px; }
  header h1 { display: none; }
}

#pagination { margin: 30px 0; display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 8px; }
#pagination button { min-width: 40px; height: 40px; padding: 0 12px; border: 1px solid var(--border-light); background: transparent; border-radius: 8px; cursor: pointer; color: var(--text-light); font-weight: 500; transition: all 0.2s ease; }
body.dark #pagination button { border-color: var(--border-dark); color: var(--text-dark); }
#pagination button.active, #pagination button:hover:not(:disabled) { background: var(--accent); color: white; border-color: var(--accent); }
#pagination button:disabled { opacity: 0.5; cursor: not-allowed; }
.pagination-ellipsis { display: flex; align-items: center; justify-content: center; min-width: 40px; height: 40px; color: var(--text-muted-light); }
body.dark .pagination-ellipsis { color: var(--text-muted-dark); }

.pagination-jump { display: flex; align-items: center; gap: 8px; margin-left: 15px; }
.pagination-jump span { font-size: 0.9rem; color: var(--text-muted-light); }
body.dark .pagination-jump span { color: var(--text-muted-dark); }
.pagination-jump input { width: 50px; height: 38px; text-align: center; border: 1px solid var(--border-light); background-color: var(--bg-light); color: var(--text-light); border-radius: 8px; -moz-appearance: textfield; }
.pagination-jump input::-webkit-outer-spin-button, .pagination-jump input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
body.dark .pagination-jump input { background-color: var(--bg-dark); border-color: var(--border-dark); color: var(--text-dark); }
.pagination-jump button { height: 38px; padding: 0 12px; background-color: var(--accent); color: white; opacity: 0.9; }
.pagination-jump button:hover { opacity: 1; }
@media (max-width: 768px) {
  .pagination-jump { justify-content: center; margin-top: 10px; margin-left: 0; }
}

footer { width: 100%; margin-top: 40px; padding: 30px 24px; box-sizing: border-box; background: var(--bg-light); border-top: 1px solid var(--border-light); color: var(--text-muted-light); transition: background 0.3s, border-top 0.3s; }
body.dark footer { background: var(--bg-dark); border-top: 1px solid var(--border-dark); color: var(--text-muted-dark); }
.footer-content { max-width: 1000px; margin: 0 auto; text-align: center; font-size: 0.9rem; }
.footer-content p { margin: 8px 0; line-height: 1.6; }
.footer-content a { color: var(--text-muted-light); text-decoration: none; transition: color 0.2s; }
body.dark .footer-content a { color: var(--text-muted-dark); }
.footer-content a:hover { color: var(--accent); }
.donation-section { display: flex; justify-content: center; align-items: center; gap: 15px; margin-bottom: 20px; }
.donation-title { font-weight: 500; }
.donation-item { position: relative; display: flex; align-items: center; }
.donation-icon { height: 24px; width: auto; cursor: pointer; transition: transform 0.2s ease; }
.donation-item a:hover .donation-icon, .wechat-donate:hover .donation-icon { transform: scale(1.1); }
.wechat-donate:hover .wechat-qr-popup { opacity: 1; visibility: visible; transform: translateY(-100%) translateY(-8px) translateX(-50%); }
.wechat-qr-popup { position: absolute; bottom: 100%; left: 50%; padding: 15px; background: var(--dropdown-bg-light); border-radius: 12px; box-shadow: var(--dropdown-shadow); opacity: 0; visibility: hidden; transition: all 0.25s ease-out; transform: translateY(-100%) translateY(0) translateX(-50%); pointer-events: none; }
body.dark .wechat-qr-popup { background: var(--dropdown-bg-dark); }
.wechat-qr-popup img { width: 240px; height: 240px; display: block; }

#modal { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.85); backdrop-filter: blur(5px); display: flex; flex-direction: column; justify-content: center; align-items: center; z-index: 9999; }
#modal.hidden { display: none; }
#modalImg { max-width: 90vw; max-height: 80vh; border-radius: 12px; margin-bottom: 12px; box-shadow: 0 0 50px rgba(0, 0, 0, 0.5); }
#closeModal { position: absolute; top: 20px; right: 25px; font-size: 2.5rem; color: rgba(255, 255, 255, 0.8); cursor: pointer; user-select: none; transition: color 0.3s; }
#closeModal:hover { color: white; }
.modal-ai-label {
  margin: 0 0 15px 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  font-style: italic;
  user-select: none;
}
#downloadBtn { color: white; background: var(--accent); padding: 10px 24px; border-radius: 8px; text-decoration: none; font-weight: 700; user-select: none; transition: transform 0.2s, opacity 0.2s; }
#downloadBtn:hover { transform: scale(1.05); opacity: 0.9; }

#floating-sidebar { position: fixed; top: 50%; right: 20px; transform: translateY(-50%); z-index: 1010; background: var(--glass-bg-light); backdrop-filter: blur(10px) saturate(150%); -webkit-backdrop-filter: blur(10px) saturate(150%); border-radius: 12px; padding: 8px; padding-top: 36px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); border: 1px solid var(--border-light); transition: all 0.3s ease-in-out; }
#floating-sidebar.is-hidden { opacity: 0; visibility: hidden; transform: translateY(-50%) translateX(150%); pointer-events: none; }
body.dark #floating-sidebar { background: var(--glass-bg-dark); border-color: var(--border-dark); box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3); }
.sidebar-close-btn { position: absolute; top: 4px; right: 4px; width: 24px; height: 24px; border: none; background: transparent; color: var(--text-muted-light); font-size: 1.5rem; line-height: 1; display: flex; align-items: center; justify-content: center; cursor: pointer; border-radius: 50%; transition: background-color 0.2s, color 0.2s, transform 0.3s ease; }
body.dark .sidebar-close-btn { color: var(--text-muted-dark); }
.sidebar-close-btn:hover { background-color: var(--border-light); color: var(--text-light); transform: rotate(90deg); }
body.dark .sidebar-close-btn:hover { background-color: var(--border-dark); color: var(--text-dark); }
.sidebar-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 15px; }
.sidebar-item { position: relative; display: flex; justify-content: center; align-items: center; }
.sidebar-link { display: block; padding: 4px; border-radius: 50%; transition: transform 0.2s ease, background-color 0.2s; }
.sidebar-link:hover { transform: scale(1.1); background-color: rgba(0, 122, 255, 0.1); }
.sidebar-icon { width: 32px; height: 32px; display: block; }
.qr-popup, .tooltip { position: absolute; right: 100%; top: 50%; transform: translateY(-50%) translateX(0px); margin-right: 15px; padding: 15px; background: var(--dropdown-bg-light); border-radius: 12px; box-shadow: var(--dropdown-shadow); opacity: 0; visibility: hidden; pointer-events: none; transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s; white-space: nowrap; text-align: center; }
.tooltip { padding: 8px 16px; }
body.dark .qr-popup, body.dark .tooltip { background: var(--dropdown-bg-dark); }
.sidebar-item:hover .qr-popup, .sidebar-item:hover .tooltip { opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(-50%) translateX(-10px); }
.qr-popup img { width: 140px; height: 140px; display: block; margin-bottom: 8px; }
.qr-popup span, .tooltip span { font-size: 0.9rem; color: var(--text-muted-light); }
body.dark .qr-popup span, body.dark .tooltip span { color: var(--text-muted-dark); }