:root {
    --canvas: #f4f6f9;
    --surface-soft: #ffffff;
    --surface-card: #edf2f8;
    --ink: #16243a;
    --body: #334155;
    --muted: #64748b;
    --hairline: #e2e8f0;
    --primary: #2563eb;
    --navy: #14243b;
    --accent-soft: #eaf1ff;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font: 14px/1.55 Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif; color: var(--body); background: var(--canvas); }
a { color: inherit; }
button, input { font: inherit; }
button { cursor: pointer; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--primary); outline-offset: 4px; }
.page-container { display: flex; min-height: 100vh; }
.sidebar-nav { flex: 0 0 216px; position: sticky; top: 0; height: 100vh; overflow-y: auto; padding: 32px 16px; border-right: 1px solid var(--hairline); background: var(--surface-soft); }
.sidebar-logo { padding: 0 8px 28px; margin-bottom: 20px; border-bottom: 1px solid var(--hairline); }
.logo a { text-decoration: none; }
.logo-text { color: var(--ink); font-size: 25px; font-weight: 500; letter-spacing: -1px; }
.subtitle { color: var(--muted); font-size: 11px; margin-top: 6px; }
.sidebar-item { list-style: none; margin-bottom: 4px; }
.sidebar-item a { display: flex; align-items: center; min-height: 44px; padding: 10px 14px; border-radius: 12px; text-decoration: none; color: var(--muted); font-weight: 500; }
.sidebar-item.active a { background: var(--primary); color: var(--canvas); }
.icon-fw { width: 20px; text-align: center; }
.mr-2 { margin-right: 12px; }
.main-content { flex: 1; min-width: 0; }
.header { padding: 80px 40px 56px; }
.header-content { max-width: 1280px; margin: auto; }
.hero-eyebrow { display: inline-block; color: var(--primary); background: var(--accent-soft); border-radius: 999px; padding: 6px 12px; font-size: 11px; font-weight: 600; letter-spacing: 1.5px; }
h1 { color: var(--ink); font-size: clamp(36px, 4vw, 64px); font-weight: 500; line-height: 1.2; letter-spacing: -2px; margin: 24px 0 16px; }
.hero-description { color: var(--muted); font-size: 16px; margin-bottom: 32px; }
.search-box { display: flex; gap: 12px; max-width: 680px; }
#searchInput { flex: 1; min-width: 0; height: 52px; padding: 12px 16px; color: var(--ink); background: var(--surface-soft); border: 1px solid var(--hairline); border-radius: 12px; }
#searchBtn { min-height: 44px; padding: 12px 28px; border: 0; border-radius: 12px; background: var(--primary); color: white; font-weight: 600; }
.websites-container { max-width: 1360px; margin: auto; padding: 0 40px; }
.category-section { --accent: var(--primary); background: var(--surface-soft); margin-bottom: 48px; padding: 28px; border: 1px solid var(--hairline); border-radius: 16px; scroll-margin-top: 24px; }
.category-title { color: var(--ink); font-size: 28px; font-weight: 500; line-height: 1.3; letter-spacing: -.5px; margin-bottom: 20px; display: flex; align-items: center; gap: 12px; }
.category-title::before { content: ''; width: 16px; height: 16px; flex-shrink: 0; border-radius: 6px; background: var(--accent); }
.subcategory-nav { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.subcategory-btn { min-height: 44px; border: 0; padding: 8px 16px; color: var(--muted); background: transparent; border-radius: 999px; }
.subcategory-btn.active { background: var(--surface-card); color: var(--ink); font-weight: 600; }
.common-style { display: grid; grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); gap: 12px; }
.ternbi-item { position: relative; min-width: 0; }
.ternbi-item-10 { display: flex; flex-direction: column; align-items: center; justify-content: flex-start; height: 100%; min-height: 120px; padding: 18px 8px; border-radius: 16px; background: var(--canvas); text-decoration: none; color: var(--ink); }
.ternbi-item-logo { display: flex; align-items: center; justify-content: center; width: 44px; height: 44px; margin-bottom: 12px; border-radius: 12px; background: var(--surface-card); color: var(--primary); }
.fa-2x { font-size: 23px; }
.ternbi-intro { font-size: 13px; line-height: 1.5; font-weight: 500; text-align: center; overflow-wrap: anywhere; }
#websitesGrid .ternbi-description { display: none; }
.hidden-item { display: none !important; }
.highlight { background: var(--accent-soft); color: var(--ink); border-radius: 4px; }
.footer { margin-top: 48px; padding: 48px 40px; background: var(--surface-soft); border-top: 1px solid var(--hairline); }
.footer-content { max-width: 1280px; margin: auto; }
.footer p { color: var(--muted); font-size: 13px; margin-top: 8px; }
.footer-friends { margin-bottom: 32px; }
.footer-friends h3 { color: var(--ink); font-size: 18px; font-weight: 500; margin-bottom: 16px; }
.footer-links { list-style: none; display: flex; flex-wrap: wrap; gap: 12px; }
.footer-links a { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 18px; border: 1px solid var(--hairline); border-radius: 12px; text-decoration: none; color: var(--primary); }
.mobile-header { display: none; }
@media (max-width: 1024px) {
    .sidebar-nav { flex-basis: 184px; padding: 24px 12px; }
    .header { padding: 56px 24px 40px; }
    .websites-container { padding: 0 24px; }
    .category-section { padding: 24px; }
}
@media (max-width: 767px) {
    .page-container { display: block; }
    .mobile-header { display: flex; align-items: center; padding: 20px; border-bottom: 1px solid var(--hairline); }
    .sidebar-nav { position: static; width: 100%; height: auto; padding: 8px 16px; border-right: 0; border-bottom: 1px solid var(--hairline); }
    .sidebar-logo { display: none; }
    .sidebar-menu-inner ul { display: flex; overflow-x: auto; gap: 4px; }
    .sidebar-item { flex-shrink: 0; margin: 0; }
    .sidebar-item a { padding: 8px 12px; }
    .sidebar-item i { display: none; }
    .header { padding: 40px 20px; }
    h1 { letter-spacing: -1px; font-size: 36px; }
    .hero-description { font-size: 14px; }
    .websites-container { padding: 0 16px; }
    .category-section { padding: 20px 16px; margin-bottom: 32px; }
    .category-title { font-size: 24px; }
    .common-style { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
    .ternbi-item-10 { padding: 16px 6px; }
    .footer { padding: 32px 20px; }
    #searchBtn { padding: 12px 20px; }
}
@media (max-width: 359px) { .common-style { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .category-section { transition: none !important; } }

.friends-frame { display: block; width: 100%; height: 152px; border: 0; margin-bottom: 16px; }

/* 商务导航：深蓝侧栏、白色内容面板、统一蓝色强调。 */
.sidebar-nav { background: var(--navy); border-right: 0; }
.sidebar-logo { border-bottom-color: #2a3c55; }
.sidebar-nav .logo-text { color: #ffffff; }
.sidebar-nav .subtitle { color: #a7b6cb; }
.sidebar-item a { color: #bdc9da; }
.sidebar-item.active a { background: var(--primary); color: #ffffff; }
.subcategory-btn.active { background: var(--accent-soft); color: #1d4ed8; }
.category-title::before { width: 4px; height: 22px; border-radius: 2px; }
.ternbi-item-logo { background: var(--accent-soft); }
#searchInput { background: var(--surface-soft); }
.header { border-bottom: 1px solid var(--hairline); margin-bottom: 32px; background: var(--surface-soft); }
@media (max-width: 767px) {
    .sidebar-nav { border-bottom: 0; }
    .header { margin-bottom: 24px; }
}

.version-dialog-open { overflow: hidden; }
.version-dialog { position: fixed; inset: 0; width: min(460px, calc(100% - 32px)); max-height: calc(100dvh - 48px); overflow-y: auto; margin: auto; padding: 36px 28px 28px; color: var(--body); background: var(--surface-soft); border: 1px solid var(--hairline); border-radius: 16px; box-shadow: 0 20px 64px rgb(20 36 59 / 18%); }
.version-dialog::backdrop { background: rgb(15 23 42 / 50%); }
.version-dialog-close { position: absolute; top: 8px; right: 8px; width: 44px; height: 44px; border: 0; background: transparent; color: var(--muted); font-size: 26px; border-radius: 8px; }
.version-dialog-badge { display: inline-block; padding: 4px 10px; background: var(--accent-soft); color: var(--primary); font-size: 12px; border-radius: 6px; }
.version-dialog h2 { margin: 18px 0 12px; font-size: 26px; font-weight: 600; color: var(--ink); overflow-wrap: anywhere; }
.version-dialog p { color: var(--muted); line-height: 1.75; overflow-wrap: anywhere; }
.version-dialog-actions { display: flex; flex-direction: column; gap: 10px; margin-top: 28px; }
.version-dialog-visit, .version-dialog-stay { display: flex; align-items: center; justify-content: center; min-height: 44px; padding: 12px 16px; border-radius: 10px; font-weight: 500; text-decoration: none; }
.version-dialog-visit { background: var(--primary); color: #fff; }
.version-dialog-stay { background: var(--surface-soft); color: var(--muted); border: 1px solid var(--hairline); }