:root { color-scheme: light; font-family: Arial, "Microsoft YaHei", sans-serif; color: #333; background: #fff; font-size: 14px; }
* { box-sizing: border-box; }
body { margin: 0; min-width: 900px; background: #fff; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { cursor: pointer; }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.top-nav { width: min(1500px, calc(100% - 520px)); min-width: 820px; height: 41px; margin: 7px auto 0; display: flex; align-items: stretch; border-radius: 6px 6px 0 0; overflow: hidden; background: linear-gradient(#858585 0, #666 48%, #4c4c4c 52%, #595959 100%); border: 1px solid #707070; box-shadow: inset 0 1px rgba(255,255,255,.34); }
.brand { width: 160px; flex: none; display: grid; place-items: center; border-right: 1px solid rgba(0,0,0,.28); background: transparent; }
.brand-logo { display: block; width: 144px; height: 28px; object-fit: contain; }
.top-nav nav { display: flex; overflow: hidden; }
.top-nav nav a { height: 40px; min-width: 72px; padding: 0 12px; display: grid; place-items: center; color: #f2f2f2; font-size: 13px; font-weight: 400; text-shadow: none; border-left: 1px solid rgba(255,255,255,.08); border-right: 1px solid rgba(0,0,0,.24); white-space: nowrap; }
.top-nav nav a:hover { background: rgba(0,0,0,.18); }
.nav-more { display: none; }
main { width: min(1500px, calc(100% - 520px)); min-width: 820px; margin: 8px auto 0; }
.panel { border: 1px solid #ccd0d4; border-radius: 4px; overflow: hidden; background: white; }
.search-panel { min-height: 134px; }
.search-form { display: grid; grid-template-columns: 1fr 56px; padding: 22px 21px 15px; }
.search-form > input[type="search"] { height: 37px; border: 1px solid #c7cdd3; border-radius: 4px 0 0 4px; padding: 6px 12px; outline: none; }
.search-form > input[type="search"]:focus { border-color: #1685ef; }
.search-form > button[type="submit"] { height: 37px; border: 0; border-radius: 0 4px 4px 0; color: white; background: #087ff1; }
.search-options { grid-column: 1 / -1; display: flex; align-items: center; gap: 16px; padding-top: 14px; color: #555; }
.search-options label { display: flex; align-items: center; gap: 4px; }
.search-options input { accent-color: #087ff1; }
.advanced-toggle { margin-left: auto; padding: 3px 8px; border: 0; color: #087ff1; background: transparent; }
.filters { grid-column: 1 / -1; padding: 3px 21px 13px; border-top: 1px solid #eef0f2; display: grid; grid-template-columns: 1fr 1fr; column-gap: 24px; }
.filters[hidden] { display: none; }
.filter-row { min-height: 34px; display: flex; align-items: center; }
.filter-row strong { width: 52px; flex: none; font-weight: 400; color: #777; }
.filter-row div { display: flex; flex-wrap: wrap; gap: 7px; }
.filter-row button { padding: 3px 8px; border: 0; border-radius: 10px; color: #555; background: #f3f4f5; }
.filter-row button.active { color: white; background: #1687ed; }
.results-panel { margin-top: 15px; }
.results-toolbar { height: 45px; display: flex; align-items: center; justify-content: space-between; padding: 0 13px; background: linear-gradient(#f5f5f5, #dedede); border-bottom: 1px solid #d0d0d0; }
.tabs { display: flex; align-items: center; gap: 12px; }
.tabs > span:first-child { color: #087ff1; font-size: 15px; }
.result-count { color: #8a8f94; font-size: 12px; }
.sorts { display: flex; align-items: center; color: #aaa; }
.sorts button { padding: 4px 7px; border: 0; color: #777; background: transparent; }
.sorts button.active { color: #087ff1; }
.message { margin: 8px 20px; padding: 8px 10px; color: #a15a00; background: #fff8e6; border: 1px solid #ffe1a3; }
.search-welcome { min-height: 235px; padding: 22px 20px 28px; background: #fff; }
.welcome-heading { display: flex; align-items: baseline; gap: 12px; padding: 0 4px 15px; border-bottom: 1px solid #e5e8eb; }
.welcome-heading strong { color: #3c4650; font-size: 17px; }
.welcome-heading span { color: #a0a6ac; font-size: 12px; }
.suggestions-board { margin-top: 15px; border: 1px solid #d8dcdf; border-radius: 3px; overflow: hidden; }
.suggestion-group { min-height: 58px; display: grid; grid-template-columns: 145px minmax(0, 1fr) auto; align-items: center; gap: 5px; padding: 9px 15px; background: #fff; }
.suggestion-group + .suggestion-group { border-top: 1px solid #e5e8eb; }
.suggestion-title { min-width: 0; padding-left: 10px; border-left: 3px solid #ef5b61; }
.recommended-group .suggestion-title { border-left-color: #1687ed; }
.best2025-group .suggestion-title { border-left-color: #e5a320; }
.best2026-group .suggestion-title { border-left-color: #31a36b; }
.suggestion-title h2 { display: inline; margin: 0; color: #4b535a; font-size: 14px; font-weight: 600; }
.suggestion-title p { display: inline; margin: 0 0 0 8px; color: #a0a6ac; font-size: 11px; }
.suggestion-controls { display: flex; align-items: center; gap: 8px; padding-left: 8px; }
.suggestion-progress { display: flex; align-items: center; gap: 4px; }
.suggestion-progress i { width: 5px; height: 5px; border-radius: 50%; background: #d4d9de; transition: width .2s, border-radius .2s, background .2s; }
.suggestion-progress i.active { width: 13px; border-radius: 4px; background: #8ca1b3; }
.suggestion-list { min-width: 0; display: flex; flex-wrap: wrap; align-items: center; }
.suggestion-list button { position: relative; min-height: 32px; padding: 5px 14px; border: 0; border-right: 1px solid #e3e6e8; color: #587087; background: transparent; transition: color .15s, background .15s; }
.suggestion-list button:last-child { border-right: 0; }
.popular-group .suggestion-list button:first-child { color: #ed4e55; }
.popular-group .suggestion-list button:first-child::after { content: "热"; margin-left: 3px; color: #ed4e55; font-size: 10px; vertical-align: top; }
.suggestion-list button:hover { color: #087ff1; background: #f3f7fa; text-decoration: underline; }
.suggestion-placeholder { color: #999; }
.topic-row { min-height: 57px; display: grid; grid-template-columns: minmax(0, 1fr) 45px; align-items: center; gap: 10px; padding: 7px 20px; border-bottom: 1px solid #e4e7ea; }
.topic-row:last-child { border-bottom: 0; }
.topic-main { min-width: 0; }
.topic-title-line { display: flex; align-items: center; gap: 7px; min-width: 0; white-space: nowrap; }
.subject { min-width: 0; overflow: hidden; text-overflow: ellipsis; color: #087ff1; font-size: 15px; }
.subject:hover { text-decoration: underline; }
mark { color: #f04a50; background: transparent; }
.meta-tag { flex: none; padding: 2px 7px; border-radius: 10px; color: #4f555a; background: #f3f4f5; font-size: 12px; }
.paperclip { flex: none; color: #555; transform: rotate(-28deg); }
.topic-subline { display: flex; gap: 9px; margin-top: 5px; color: #8b9095; font-size: 12px; }
.topic-stats { justify-self: end; color: #8b949b; font-size: 12px; }
.empty { padding: 55px 15px; text-align: center; color: #888; }
.empty-results button { display: block; min-height: 38px; margin: 18px auto 0; padding: 7px 16px; border: 1px solid #92c8f7; border-radius: 4px; color: #087ff1; background: #f4faff; }
.pagination { min-height: 75px; display: flex; align-items: center; justify-content: center; }
.pagination button, .pagination .ellipsis { min-width: 32px; height: 33px; margin-left: -1px; display: grid; place-items: center; border: 1px solid #d4dae0; background: white; color: #087ff1; }
.pagination button.active { color: white; background: #087ff1; border-color: #087ff1; }
.back-top { position: fixed; right: 28px; bottom: 90px; width: 42px; height: 42px; border: 1px solid #e2e4e6; color: #8a9197; background: white; box-shadow: 0 2px 10px rgba(0,0,0,.05); }
footer { width: calc(100% - 380px); min-height: 72px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; color: #6f7b86; font-size: 12px; }
@media (max-width: 1500px) { .top-nav, main { width: calc(100% - 80px); } footer { width: calc(100% - 80px); } .top-nav nav a { min-width: auto; padding: 0 9px; font-size: 13px; } }
@media (max-width: 720px) {
  :root { font-size: 14px; }
  body { min-width: 0; overflow-x: hidden; }
  .top-nav { width: 100%; min-width: 0; height: 44px; margin: 0; border: 0; border-radius: 0; overflow-x: auto; scrollbar-width: none; }
  .top-nav::-webkit-scrollbar { display: none; }
  .brand { position: sticky; left: 0; z-index: 2; width: 128px; min-width: 128px; background: linear-gradient(#777, #474747); }
  .brand-logo { width: 116px; height: 23px; }
  .top-nav nav { flex: none; overflow: visible; }
  .top-nav nav a { height: 44px; padding: 0 12px; font-size: 13px; }
  .nav-more { position: fixed; z-index: 4; top: 0; right: 0; width: 30px; height: 44px; display: grid; place-items: center; pointer-events: none; color: #fff; font-size: 20px; background: linear-gradient(90deg, rgba(62,62,62,0), #3e3e3e 52%); }
  main { width: 100%; min-width: 0; margin: 0; padding: 10px; }
  .panel { border-radius: 5px; }
  .search-panel { min-height: 0; }
  .search-form { grid-template-columns: minmax(0, 1fr) 58px; padding: 14px 12px 12px; }
  .search-form > input[type="search"], .search-form > button[type="submit"] { height: 44px; }
  .search-options { flex-wrap: wrap; gap: 10px 14px; padding-top: 12px; font-size: 13px; }
  .search-options > span { width: 100%; }
  .search-options label { min-height: 44px; padding: 0 2px; }
  .advanced-toggle { min-height: 44px; margin-left: auto; padding: 7px 8px; }
  .filters { padding: 8px 12px 12px; grid-template-columns: 1fr; }
  .filter-row { align-items: flex-start; padding: 5px 0; }
  .filter-row strong { padding-top: 3px; }
  .filter-row button { min-height: 40px; padding: 8px 12px; border-radius: 20px; }
  .results-panel { margin-top: 10px; }
  .results-toolbar { height: auto; min-height: 45px; flex-wrap: wrap; gap: 3px 8px; padding: 9px 11px; }
  .tabs { width: 100%; justify-content: space-between; }
  .sorts { width: 100%; overflow-x: auto; white-space: nowrap; }
  .sorts button { min-height: 44px; padding: 8px 9px; }
  .message { margin: 8px 10px; }
  .search-welcome { min-height: 0; padding: 17px 12px 22px; }
  .welcome-heading { display: block; padding: 0 2px 16px; }
  .welcome-heading strong, .welcome-heading span { display: block; }
  .welcome-heading span { margin-top: 5px; }
  .suggestions-board { margin-top: 13px; }
  .suggestion-group { min-height: 0; grid-template-columns: minmax(0, 1fr) auto; gap: 7px; padding: 10px 9px; }
  .suggestion-title { margin: 0 4px; }
  .suggestion-list { grid-column: 1 / -1; }
  .suggestion-controls { padding-left: 0; }
  .suggestion-list button { min-width: 0; min-height: 42px; padding: 8px 12px; }
  .topic-row { min-height: 0; grid-template-columns: minmax(0,1fr) auto; align-items: end; padding: 11px 12px; }
  .topic-title-line { flex-wrap: wrap; white-space: normal; gap: 6px; }
  .subject { width: 100%; flex-basis: 100%; overflow: visible; line-height: 1.45; font-size: 14px; }
  .topic-subline { flex-wrap: wrap; }
  .topic-stats { padding-bottom: 1px; }
  .pagination { min-height: 64px; max-width: 100%; overflow-x: auto; justify-content: flex-start; padding: 12px 4px; }
  .pagination button, .pagination .ellipsis { flex: none; min-width: 44px; height: 44px; }
  .back-top { right: 13px; bottom: 68px; width: 44px; height: 44px; }
  footer { width: 100%; min-height: 60px; padding: 0 12px; gap: 8px; font-size: 11px; }
}