: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);
  --dropdown-bg-light: #ffffff; --dropdown-bg-dark: #2c2c2e;
  --dropdown-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
  --card-bg-light: #ffffff; --card-bg-dark: #1e1e1e;
}
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); }
main { flex-grow: 1; }

header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; display: flex; align-items: center; 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); }

.logo-link { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.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; align-items: center; gap: 16px; height: 100%; list-style: none; margin: 0; padding: 0; margin-left: 24px; }
.nav-group { position: relative; display: flex; align-items: center; }
.group-btn { display: flex; align-items: center; gap: 5px; padding: 0 16px; height: 100%; border: none; background: transparent; color: var(--text-light); font-size: 1rem; font-weight: 500; cursor: pointer; transition: color 0.2s, background-color 0.2s, opacity 0.3s ease; 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); }
body.is-searching .group-btn.active { opacity: 0.6; }
.nav-group:hover .group-btn::after { transform: rotate(180deg); }

.category-list { position: absolute; top: 100%; left: 50%; padding: 8px; margin: 0; margin-top: 8px; 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, opacity 0.3s ease; text-decoration: none; }
body.dark .category-btn { color: var(--text-dark); }
.category-btn.active, .category-btn:hover { background-color: var(--accent); color: white !important; }
body.is-searching .category-btn.active { opacity: 0.6; }

.search-container { display: flex; align-items: center; margin-left: auto; background-color: var(--bg-light); border: 1px solid var(--border-light); border-radius: 8px; transition: all 0.3s ease; }
body.dark .search-container { background-color: var(--card-bg-dark); border-color: var(--border-dark); }
.search-container:focus-within { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.3); }

#searchScopeBtn, #searchBtn { display: flex; justify-content: center; align-items: center; border: none; background: transparent; cursor: pointer; height: 36px; padding: 0 10px; color: var(--text-muted-light); transition: color 0.2s, background-color 0.2s; }
body.dark #searchScopeBtn, body.dark #searchBtn { color: var(--text-muted-dark); }
#searchScopeBtn:hover, #searchBtn:hover { color: var(--accent); }

#searchScopeBtn { border-right: 1px solid var(--border-light); }
body.dark #searchScopeBtn { border-right-color: var(--border-dark); }
#searchScopeBtn .folder-icon { display: none; }
#searchScopeBtn.active .globe-icon { display: none; }
#searchScopeBtn.active .folder-icon { display: block; }
#searchBtn { padding-right: 12px; }
#searchInput { flex-grow: 1; border: none; background: transparent; color: var(--text-light); padding: 0 10px; width: 200px; height: 36px; font-size: 0.9rem; outline: none; }
body.dark #searchInput { color: var(--text-dark); }

main { padding: 20px; max-width: 1800px; margin: 0 auto; }
#gallery { display: grid; grid-template-columns: repeat(5, 1fr); grid-template-rows: masonry; gap: 20px; }
@media (max-width: 1400px) { #gallery { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 1100px) { .search-container { display: none; } }
@media (max-width: 1024px) { #gallery { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px) { #gallery { grid-template-columns: repeat(2, 1fr); gap: 15px; } header h1 { display: none;} }
@media (max-width: 480px) { #gallery { grid-template-columns: repeat(1, 1fr); } }

.gallery-item { background-color: var(--card-bg-light); border-radius: 12px; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08); transition: transform 0.3s ease, box-shadow 0.3s ease; overflow: hidden; }
body.dark .gallery-item { background-color: var(--card-bg-dark); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3); }
.gallery-item:hover { transform: scale(1.03); box-shadow: 0 10px 25px rgba(0,0,0,0.12); }
body.dark .gallery-item:hover { box-shadow: 0 10px 25px rgba(0,0,0,0.4); }
#gallery img { width: 100%; height: auto; display: block; cursor: pointer; }
.color-value { padding: 12px 15px; text-align: center; font-family: 'Menlo', 'Monaco', 'Consolas', 'Courier New', monospace; font-size: 0.95rem; font-weight: 500; color: var(--text-muted-light); background-color: var(--card-bg-light); line-height: 1.4; transition: background-color 0.3s ease, color 0.3s ease; user-select: none; cursor: pointer; word-break: break-all; }
body.dark .color-value { color: var(--text-muted-dark); background-color: var(--card-bg-dark); }
.gallery-item:hover .color-value { color: var(--accent); }

#pagination { margin: 30px 0; display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; align-items:center; }
#pagination button { min-width: 40px; height: 40px; padding: 0 10px; 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 { background: var(--accent); color: white; border-color: var(--accent); }
.pagination-ellipsis { display: inline-flex; align-items: center; justify-content: center; min-width: 40px; height: 40px; color: var(--text-muted-light);}

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; }
.hidden { display: none !important; }
#modalImg { max-width: 90vw; max-height: 80vh; border-radius: 12px; margin-bottom: 20px; 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; }
#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, background 0.2s; }
#downloadBtn:hover { transform: scale(1.05); opacity: 0.9; }

#themeToggle { display: flex; justify-content: center; align-items: center; background: transparent; border: none; padding: 8px; border-radius: 50%; cursor: pointer; color: var(--text-muted-light); transition: all 0.2s ease; margin-left: 12px; }
body.dark #themeToggle { color: var(--text-muted-dark); }
#themeToggle:hover { color: var(--accent); background-color: var(--border-light); }
body.dark #themeToggle:hover { background-color: var(--border-dark); }
#themeToggle svg { stroke: currentColor; }
.sun-icon { display: block; } .moon-icon { display: none; }
body.dark .sun-icon { display: none; } body.dark .moon-icon { display: block; }

.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(--card-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 { border-color: var(--border-dark); background-color: var(--card-bg-dark); color: var(--text-dark); }
.pagination-jump button { height: 38px; padding: 0 12px; background-color: var(--accent); color: white; opacity: 0.9; border:none; border-radius:8px; cursor:pointer;}
.pagination-jump button:hover { opacity: 1; }

#productsNav { display: flex; height: 100%; list-style: none; margin: 0; padding: 0; margin-left: 16px;}
.nav-group-container { display:flex; height:100%; list-style:none; margin:0; padding:0; }
.product-list .category-btn { display: block; text-decoration: none; color: var(--text-light); }
body.dark .product-list .category-btn { color: var(--text-dark); }
.product-list .category-btn:hover, .product-list .category-btn.active { background-color: var(--accent); color: white !important; }

#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: 16px; padding: 36px 8px 8px 8px; 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(120%); 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: 6px; right: 6px; 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 0.2s; z-index: 2; }
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; background-color: white; padding: 5px; box-sizing: border-box; border-radius: 4px; }
.qr-popup span, .tooltip span { font-size: 0.9rem; color: var(--text-light); font-weight: 500; }
body.dark .qr-popup span, body.dark .tooltip span { color: var(--text-dark); }