:root {
    --bg-color: #f7f8fc; --sidebar-bg: #ffffff; --card-bg: #ffffff;
    --primary-color: #4a69bd; --primary-hover: #3b528f; --primary-light: #eef2ff;
    --text-dark: #1f2937; --text-normal: #4b5563; --text-light: #9ca3af;
    --border-color: #e5e7eb; --shadow-color: rgba(149, 157, 165, 0.1);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes flame-flicker { 0%, 100% { transform: scaleY(1) rotate(-2deg); } 50% { transform: scaleY(1.05) rotate(2deg); } }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-family: 'Inter', sans-serif; background-color: var(--bg-color); color: var(--text-normal); line-height: 1.6; }
#page-container { display: flex; min-height: 100vh; }
#sidebar { width: 280px; background-color: var(--sidebar-bg); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; position: fixed; top: 0; left: 0; height: 100%; z-index: 100; transform: translateX(-100%); transition: transform 0.3s ease; }
.sidebar-header { padding: 24px; border-bottom: 1px solid var(--border-color); text-align: center; }
.sidebar-logo { font-size: 24px; font-weight: 700; color: var(--text-dark); text-decoration: none; }
.user-info-panel { padding: 24px; text-align: center; }
.user-info-panel .avatar { width: 80px; height: 80px; border-radius: 50%; margin: 0 auto 16px; display: block; object-fit: contain; }
.user-info-panel .username { font-size: 18px; font-weight: 600; color: var(--text-dark); }
.user-info-panel .email { font-size: 14px; color: var(--text-light); margin-top: 4px; }
.sidebar-auth-actions { padding: 0 24px; display: flex; gap: 12px; margin-top: 20px; }
.sidebar-auth-actions a { flex: 1; text-align:center; text-decoration: none; color: var(--text-normal); font-weight: 500; padding: 10px; border-radius: 8px; transition: all 0.2s; }
.sidebar-auth-actions .btn-login { background-color: var(--primary-light); color: var(--primary-color); }
.sidebar-auth-actions .btn-register { background-color: var(--primary-color); color: #fff; }
.sidebar-nav { padding: 16px 24px; flex-grow: 1; }
.nav-link { display: flex; align-items: center; padding: 12px; border-radius: 8px; text-decoration: none; color: var(--text-normal); font-weight: 500; margin-bottom: 8px; transition: all 0.2s; }
.nav-link.active, .nav-link:hover { background-color: var(--primary-light); color: var(--primary-color); }
.nav-link svg { margin-right: 12px; flex-shrink: 0; }
.sidebar-footer { padding: 24px; border-top: 1px solid var(--border-color); }
.btn-logout { display: block; width: 100%; text-align: center; padding: 12px; border-radius: 8px; background-color: #fee2e2; color: #b91c1c; font-weight: 600; text-decoration: none; transition: all 0.2s; }
#main-content { flex-grow: 1; margin-left: 0; display: flex; flex-direction: column; width: 100%; }
.top-header { padding: 48px 32px 24px; text-align: center; background-color: var(--card-bg); border-bottom: 1px solid var(--border-color); }
.top-header-content { max-width: 700px; margin: 0 auto; }
.top-header-content h1 { font-size: 42px; font-weight: 800; color: var(--text-dark); margin: 0; line-height: 1.2; }
.top-header-content p { font-size: 18px; color: var(--text-light); margin-top: 16px; }
.search-container { margin-top: 32px; position: relative; }
.search-container input { width: 100%; height: 50px; border-radius: 12px; border: 1px solid var(--border-color); background-color: var(--bg-color); padding-left: 50px; padding-right: 20px; font-size: 16px; }
.search-container input:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px var(--primary-light); }
.search-container svg { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--text-light); }
.main-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 32px; background-color: var(--card-bg); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 50; }
#mobile-menu-btn { background: none; border: none; cursor: pointer; padding: 8px; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-right: 16px; }
#mobile-menu-btn:hover { background-color: var(--border-color); }
.user-actions { display: flex; align-items: center; }
.user-actions a { text-decoration: none; color: var(--text-normal); font-weight: 500; padding: 8px 16px; border-radius: 8px; transition: all 0.2s; }
.user-actions a.btn-login { background-color: var(--primary-light); color: var(--primary-color); }
.user-actions a.btn-register { background-color: var(--primary-color); color: #fff; margin-left: 8px; }
.user-profile { display: flex; align-items: center; position: relative; cursor: pointer; }
.user-profile .avatar { width: 40px; height: 40px; border-radius: 50%; background-color: var(--primary-light); color: var(--primary-color); display: flex; align-items: center; justify-content: center; font-weight: 600; margin-right: 12px; }
.user-profile .username { font-weight: 600; }
.user-profile .dropdown-menu { display: none; position: absolute; top: 100%; left: 0; background-color: var(--card-bg); border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); border: 1px solid var(--border-color); width: 180px; z-index: 200; padding: 8px; }
.user-profile:hover .dropdown-menu { display: block; }
.dropdown-item { display: block; padding: 10px 12px; color: var(--text-normal); text-decoration: none; border-radius: 6px; font-weight: 500; }
.dropdown-item:hover { background-color: var(--bg-color); }
.content-wrapper { padding: 20px 32px 0px; }
.announcement-bar { background-color: var(--primary-light); color: var(--primary-color); padding: 16px; border-radius: 12px; margin-bottom: 32px; display: flex; align-items: center; animation: fadeIn 0.5s ease; }
.announcement-bar svg { flex-shrink: 0; margin-right: 12px; }
.category-tabs { margin-bottom: 32px; border-bottom: 2px solid var(--border-color); }
.category-tabs-list { display: flex; gap: 8px; flex-wrap: wrap; }
.category-tab { padding: 12px 24px; background-color: transparent; border: none; border-bottom: 3px solid transparent; color: var(--text-normal); font-size: 16px; font-weight: 600; cursor: pointer; transition: all 0.3s ease; position: relative; margin-bottom: -2px; }
.category-tab:hover { color: var(--primary-color); background-color: var(--primary-light); border-radius: 8px 8px 0 0; }
.category-tab.active { color: var(--primary-color); border-bottom-color: var(--primary-color); background-color: var(--primary-light); border-radius: 8px 8px 0 0; }
.content-layout { display: flex; gap: 24px; margin-bottom: 32px; }
.subcategory-sidebar { width: 280px; flex-shrink: 0; background: linear-gradient(180deg, #e8f0fe 0%, #d4e4fc 100%); border-radius: 16px; padding: 24px; position: relative; overflow: hidden; }
.subcategory-sidebar-title { color: #1e40af; font-size: 18px; font-weight: 700; margin-bottom: 20px; position: relative; z-index: 1; }
.subcategory-wrapper { position: relative; }
.subcategory-scroll { display: flex; flex-direction: column; gap: 8px; }
.subcategory-tag { padding: 14px 20px; background-color: rgba(255,255,255,0.8); border: 1px solid rgba(59, 130, 246, 0.2); border-radius: 12px; color: #1e40af; font-size: 15px; font-weight: 500; cursor: pointer; transition: all 0.2s ease; text-align: left; position: relative; z-index: 1; display: flex; align-items: center; }
.subcategory-tag:hover { background-color: rgba(255,255,255,0.95); border-color: rgba(59, 130, 246, 0.4); color: #1e3a8a; }
.subcategory-tag.active { background-color: #3b82f6; color: #fff; border-color: #3b82f6; font-weight: 600; }
.api-content-area { flex: 1; min-width: 0; }
.api-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 24px; }
.api-empty-state { grid-column: 1 / -1; text-align: center; padding: 80px 20px; background-color: var(--card-bg); border-radius: 16px; border: 2px dashed var(--border-color); }
.api-empty-state svg { width: 80px; height: 80px; color: var(--text-light); margin-bottom: 24px; opacity: 0.5; }
.api-empty-state h3 { font-size: 20px; font-weight: 600; color: var(--text-dark); margin-bottom: 8px; }
.api-empty-state p { font-size: 14px; color: var(--text-light); }
.api-card { background-color: var(--card-bg); border-radius: 16px; border: 2px solid var(--border-color); box-shadow: 0 4px 12px var(--shadow-color); padding: 24px 14px; display: flex; flex-direction: column; transition: all 0.3s ease; animation: fadeIn 0.5s ease forwards; }
.api-card:hover { transform: translateY(-5px); box-shadow: 0 8px 20px var(--shadow-color); }
.card-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 12px; }
.api-name { font-size: 16px; font-weight: 700; color: #111827; }
.status-badge { display: inline-block; padding: 4px 10px; border-radius: 99px; font-size: 12px; font-weight: 600; }
.status-green { background-color: #dcfce7; color: #166534; } .status-red { background-color: #fee2e2; color: #991b1b; } .status-yellow { background-color: #fef9c3; color: #854d0e; } .status-gray { background-color: #f3f4f6; color: #374151; }
.api-description { color: var(--text-normal); margin-bottom: 16px; flex-grow: 1; }
.card-footer { border-top: 1px solid var(--border-color); padding-top: 16px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.api-meta { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.meta-item { display: flex; align-items: center; color: var(--text-light); font-size: 14px; font-weight: 500; }
.meta-item svg { margin-right: 6px; }
.meta-item .call-count { font-weight: 700; display: flex; align-items: center; }
.flame-icon { width: 16px; height: 16px; margin-left: 4px; animation: flame-flicker infinite; }
.btn-details { background-color: var(--primary-color); color: #fff; padding: 10px 20px; border-radius: 8px; text-decoration: none; font-weight: 600; transition: background-color 0.2s; white-space: nowrap; }
.btn-details:hover { background-color: var(--primary-hover); }
.page-footer { text-align: center; padding: 0 24px 24px; font-size: 14px; color: var(--text-light); }
.page-footer > div { margin: 4px 0; }
.page-footer .beian-info { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 4px; }
.page-footer .beian-info .beian { display: inline-flex; align-items: center; gap: 4px; }
.page-footer .beian-info .beian img { vertical-align: middle; }
.page-footer .beian-info .beian a { text-decoration: none; }
.page-footer .beian-info .beian a:hover { text-decoration: underline; }
#sidebar-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 99; }
@media (min-width: 1025px) { #sidebar { transform: translateX(0); } #main-content { margin-left: 280px; } #mobile-menu-btn { display: none; } }
@media (max-width: 1024px) { body.sidebar-open #sidebar { transform: translateX(0); } body.sidebar-open #sidebar-overlay { display: block; } }
@media (max-width: 768px) {
    .api-grid { grid-template-columns: 1fr; }
    .top-header { padding: 32px 16px; }
    .top-header-content h1 { font-size: 32px; }
    .content-wrapper { padding: 16px; }
    .announcement-bar { margin-bottom: 16px; }
    .category-tabs { margin-bottom: 24px; }
    .category-tab { padding: 10px 16px; font-size: 14px; }
    .content-layout { flex-direction: column; }
    .subcategory-sidebar { width: 100%; }
}