@charset "utf-8";
/* ============================================================
   新闻资讯模板 xinwen1 · 现代资讯门户（PC 响应式）
   文件：css/style.css
   ============================================================ */

:root {
  --ink: #0b1220;
  --ink-2: #334155;
  --muted: #64748b;
  --faint: #94a3b8;
  --line: #e9eef5;
  --line-soft: #f1f5f9;
  --brand: #2563eb;
  --brand-2: #06b6d4;
  --accent: #f43f5e;
  --bg: #f6f8fb;
  --card: #ffffff;
  --radius: 18px;
  --radius-s: 12px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .04);
  --shadow-md: 0 10px 30px -12px rgba(15, 23, 42, .16);
  --grad: linear-gradient(135deg, #2563eb, #06b6d4);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(1200px 520px at 88% -12%, rgba(37, 99, 235, .09), transparent 62%),
    radial-gradient(900px 420px at -8% 2%, rgba(6, 182, 212, .07), transparent 58%),
    var(--bg);
  color: var(--ink-2);
  font: 14px/1.7 "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; transition: color .2s ease, background-color .2s ease, border-color .2s ease; }
a:hover { color: var(--brand); }
img { max-width: 100%; border: 0; vertical-align: middle; }
ul, ol, li { list-style: none; }
em, i { font-style: normal; }

::selection { background: rgba(37, 99, 235, .18); color: var(--ink); }
:focus-visible { outline: 2px solid rgba(37, 99, 235, .55); outline-offset: 2px; }

.wrap { width: 1200px; max-width: 94%; margin: 0 auto; }

/* ---------------- 顶部信息条 ---------------- */
.topbar {
  background: #0b1220;
  color: #8fa3bf;
  font-size: 12.5px;
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 38px; }
.topbar-left { display: flex; align-items: center; gap: 10px; }
.topbar-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--brand-2);
  box-shadow: 0 0 0 4px rgba(6, 182, 212, .16);
}
.topbar-hint { color: #61748f; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.topbar-right a { color: #b6c6db; }
.topbar-right a:hover { color: #fff; }
.topbar-sep { color: #3c4b61; }

/* ---------------- 头部 ---------------- */
.site-head {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .86);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(233, 238, 245, .9);
  transition: box-shadow .25s ease;
}
.site-head.is-scrolled { box-shadow: 0 12px 30px -20px rgba(15, 23, 42, .35); }
.head-inner { display: flex; align-items: center; gap: 26px; height: 76px; }

.logo { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.logo-mark {
  width: 44px; height: 44px; flex: 0 0 44px;
  border-radius: 13px;
  background: var(--grad);
  color: #fff;
  font: 800 24px/44px "Inter", Georgia, serif;
  text-align: center;
  box-shadow: 0 10px 22px -10px rgba(37, 99, 235, .75);
}
.logo-text {
  display: block;
  font-size: 20px; font-weight: 800; letter-spacing: -.3px;
  color: var(--ink);
}
.logo-text em {
  display: block;
  margin-top: 1px;
  font-size: 9.5px; font-weight: 600; letter-spacing: .26em;
  color: var(--faint);
}

.site-nav { flex: 1 1 auto; min-width: 0; }
.nav-list { display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.nav-list li a {
  display: block;
  padding: 9px 14px;
  border-radius: 10px;
  font-size: 15px;
  color: #475569;
  white-space: nowrap;
}
.nav-list li a:hover { background: #f1f5f9; color: var(--brand); }
.nav-list li a.on {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 8px 18px -10px rgba(37, 99, 235, .8);
}

.head-cta {
  flex: 0 0 auto;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 18px; border-radius: 999px;
  background: var(--grad); color: #fff;
  font-size: 13px; font-weight: 600;
  box-shadow: 0 10px 22px -12px rgba(37, 99, 235, .85);
}
.head-cta i { transition: transform .25s ease; }
.head-cta:hover { color: #fff; box-shadow: 0 14px 26px -12px rgba(37, 99, 235, .95); }
.head-cta:hover i { transform: translateX(3px); }

/* ---------------- 焦点区 ---------------- */
.hero { padding-top: 24px; }
.hero-grid { display: grid; grid-template-columns: 1.9fr 1fr; gap: 18px; }
.hero-main, .hero-side { min-width: 0; }
.hero-side { display: grid; grid-template-rows: 1fr 1fr; gap: 18px; }

.hero-item {
  position: relative; display: block; overflow: hidden;
  border-radius: 20px; background: #0f172a;
  height: 100%; min-height: 200px;
  isolation: isolate;
}
.hero-main .hero-item { height: 440px; }
.hero-img {
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .8s cubic-bezier(.2, .7, .2, 1);
}
.hero-item:hover .hero-img { transform: scale(1.06); }
.hero-item::after {
  content: "";
  position: absolute; top: 0; right: 0; bottom: 0; left: 0;
  background: linear-gradient(180deg, rgba(2, 6, 23, 0) 35%, rgba(2, 6, 23, .55) 68%, rgba(2, 6, 23, .9) 100%);
  z-index: 1;
}
.hero-mask {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: 26px 26px 24px;
  color: #fff;
}
.hero-tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 11px;
  border-radius: 999px;
  background: rgba(244, 63, 94, .92);
  font-size: 11px; font-weight: 600; letter-spacing: .08em;
  box-shadow: 0 6px 16px -8px rgba(244, 63, 94, .9);
}
.hero-mask strong {
  display: block;
  font-size: clamp(21px, 2.3vw, 32px);
  line-height: 1.38;
  font-weight: 800;
  letter-spacing: -.4px;
  text-shadow: 0 2px 18px rgba(2, 6, 23, .35);
}
.hero-info {
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
  margin-top: 10px;
  font-size: 13.5px; line-height: 1.7;
  color: rgba(255, 255, 255, .78);
}
.hero-date {
  display: inline-block;
  margin-top: 12px;
  font-size: 12px;
  color: rgba(255, 255, 255, .6);
}
.hero-side .hero-mask { padding: 18px 18px 16px; }
.hero-side .hero-mask strong { font-size: 17px; line-height: 1.45; }

/* ---------------- 快讯条 ---------------- */
.ticker {
  display: flex; align-items: center; gap: 16px;
  margin-top: 18px;
  padding: 10px 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.ticker-label {
  flex: 0 0 auto;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--grad);
  color: #fff;
  font-size: 12px; font-weight: 600;
}
.ticker-list {
  display: flex; align-items: center; gap: 26px;
  overflow-x: auto; scrollbar-width: none;
  min-width: 0;
}
.ticker-list::-webkit-scrollbar { display: none; }
.ticker-list a {
  position: relative;
  flex: 0 0 auto;
  padding-left: 14px;
  font-size: 13px;
  color: #475569;
  white-space: nowrap;
}
.ticker-list a::before {
  content: "";
  position: absolute; left: 0; top: 50%;
  width: 5px; height: 5px; margin-top: -2.5px;
  border-radius: 50%;
  background: var(--brand-2);
}
.ticker-list a:hover { color: var(--brand); }

/* ---------------- 频道入口 ---------------- */
.channel-bar {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  margin-top: 16px;
}
.channel-label {
  padding: 6px 12px;
  border-radius: 999px;
  background: #0b1220;
  color: #fff;
  font-size: 12px; font-weight: 600;
  letter-spacing: .04em;
}
.channel-bar a {
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: #475569;
  font-size: 13px;
}
.channel-bar a:hover {
  border-color: rgba(37, 99, 235, .4);
  color: var(--brand);
  background: #f5f9ff;
}

/* ---------------- 主体两栏 ---------------- */
.main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 348px;
  gap: 24px;
  margin: 24px auto 60px;
  align-items: start;
}
.main-left { min-width: 0; }
.main-right { min-width: 0; }
.main-right .panel:last-child { margin-bottom: 0; }

/* ---------------- 面板 ---------------- */
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin-bottom: 22px;
  overflow: hidden;
}
.panel-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px;
  height: 60px;
  padding: 0 22px;
  border-bottom: 1px solid var(--line-soft);
}
.panel-title { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.panel-title h3 {
  font-size: 18px; font-weight: 800; letter-spacing: -.2px;
  color: var(--ink);
  white-space: nowrap;
}
.panel-title .en {
  font-size: 10px; font-weight: 700;
  letter-spacing: .22em;
  color: #b3c0d1;
}
.panel-head .more {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 13px; color: var(--muted);
  white-space: nowrap;
}
.panel-head .more i { transition: transform .25s ease; }
.panel-head .more:hover { color: var(--brand); }
.panel-head .more:hover i { transform: translateX(3px); }
.head-tip {
  padding: 3px 10px;
  border-radius: 999px;
  background: #f1f5f9;
  color: var(--faint);
  font-size: 11.5px;
  white-space: nowrap;
}

/* ---------------- 新闻列表 ---------------- */
.news-list { padding: 2px 0; }
.news-list li {
  display: flex; gap: 18px;
  padding: 18px 22px;
  border-bottom: 1px solid #f4f7fb;
  transition: background-color .2s ease;
}
.news-list li:last-child { border-bottom: 0; }
.news-list li:hover { background: #fafcff; }

.news-list .thumb {
  position: relative;
  flex: 0 0 216px; width: 216px; height: 136px;
  border-radius: var(--radius-s);
  overflow: hidden;
  background: #eef3f9;
}
.news-list .thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .55s cubic-bezier(.2, .7, .2, 1);
}
.news-list li:hover .thumb img { transform: scale(1.06); }

.news-txt { flex: 1 1 auto; min-width: 0; }
.news-txt h4 {
  font-size: 17px; line-height: 1.55; font-weight: 700;
  letter-spacing: -.2px;
}
.news-txt h4 a {
  color: var(--ink);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-txt h4 a:hover { color: var(--brand); }
.news-txt p {
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
  margin-top: 7px;
  font-size: 13.5px; line-height: 1.75;
  color: var(--muted);
}
.news-txt .meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 4px;
  margin-top: 10px;
  font-size: 12px;
  color: var(--faint);
}
.news-txt .meta span { display: inline-flex; align-items: center; }
.news-txt .meta span + span::before {
  content: "·";
  margin: 0 9px;
  color: #cbd5e1;
}
.news-list.big .thumb { flex: 0 0 232px; width: 232px; height: 146px; }
.news-list.big .news-txt h4 { font-size: 18px; }

/* ---------------- 图文格子 ---------------- */
.pic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  padding: 18px 22px 22px;
}
.pic-grid li {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  background: #eef3f9;
}
.pic-grid li a { display: block; position: relative; }
.pic-grid li img {
  width: 100%; height: 158px;
  object-fit: cover;
  transition: transform .6s cubic-bezier(.2, .7, .2, 1);
}
.pic-grid li:hover img { transform: scale(1.07); }
.pic-cap {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 30px 12px 11px;
  background: linear-gradient(transparent, rgba(2, 6, 23, .86));
  color: #fff;
  font-size: 12.5px; line-height: 1.55;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------------- 面包屑 ---------------- */
.crumb {
  margin-top: 18px;
  font-size: 13px;
  color: var(--faint);
}
.crumb a { color: #475569; }
.crumb a:hover { color: var(--brand); }
.crumb i { margin: 0 8px; color: #cbd5e1; }
.crumb span { color: var(--faint); }

/* ---------------- 栏目横幅 ---------------- */
.list-banner { margin-top: 16px; }
.list-banner-inner {
  position: relative;
  padding: 36px 36px 34px;
  border-radius: 20px;
  color: #fff;
  background:
    radial-gradient(900px 220px at 88% 6%, rgba(56, 189, 248, .38), transparent 62%),
    radial-gradient(600px 240px at 6% 110%, rgba(37, 99, 235, .5), transparent 60%),
    linear-gradient(120deg, #0b1220 0%, #122a5e 50%, #1d4ed8 100%);
  box-shadow: 0 22px 44px -24px rgba(13, 42, 94, .8);
  overflow: hidden;
}
.banner-en {
  display: inline-block;
  font-size: 10px; font-weight: 700;
  letter-spacing: .32em;
  color: rgba(255, 255, 255, .55);
}
.list-banner-inner h2 {
  margin-top: 8px;
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -.5px;
}
.list-banner-inner p {
  margin-top: 8px;
  max-width: 720px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, .76);
}

/* ---------------- 分页 ---------------- */
.pager {
  display: flex; flex-wrap: wrap; gap: 8px;
  justify-content: center;
  padding: 22px;
  border-top: 1px solid var(--line-soft);
}
.pager a {
  min-width: 36px; height: 36px;
  padding: 0 12px;
  line-height: 34px;
  text-align: center;
  font-size: 13px;
  color: #475569;
  border: 1px solid #e5eaf2;
  border-radius: 10px;
  background: #fff;
}
.pager a:hover {
  color: var(--brand);
  border-color: rgba(37, 99, 235, .45);
  background: #f5f9ff;
}

/* ---------------- 侧栏：栏目 ---------------- */
.cat-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 16px 18px 20px;
}
.cat-list li a {
  display: flex; align-items: center; justify-content: space-between;
  gap: 6px;
  padding: 9px 12px;
  border-radius: 10px;
  background: #f6f9fd;
  color: #334155;
  font-size: 13px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.cat-list li a::after { content: "›"; color: #94a3b8; flex: 0 0 auto; }
.cat-list li a:hover { background: #eef4ff; color: var(--brand); }
.cat-list li a:hover::after { color: var(--brand); }

/* ---------------- 侧栏：排行 ---------------- */
.rank-list { padding: 8px 18px 18px; }
.rank-list li {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed #eef2f7;
}
.rank-list li:last-child { border-bottom: 0; }
.rank-list i {
  flex: 0 0 24px; width: 24px; height: 24px;
  margin-top: 1px;
  display: grid; place-items: center;
  border-radius: 8px;
  background: var(--line-soft);
  color: #64748b;
  font-size: 12px; font-weight: 700;
}
.rank-list li:nth-child(1) i { background: linear-gradient(135deg, #f43f5e, #fb7185); color: #fff; }
.rank-list li:nth-child(2) i { background: linear-gradient(135deg, #fb923c, #fdba74); color: #fff; }
.rank-list li:nth-child(3) i { background: linear-gradient(135deg, #f59e0b, #fcd34d); color: #fff; }
.rank-list a {
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 14px; line-height: 1.55;
  color: #1e293b;
}
.rank-list a:hover { color: var(--brand); }

/* ---------------- 侧栏：图文 ---------------- */
.side-pic-list { padding: 16px 18px 18px; }
.side-pic-list li {
  position: relative;
  margin-bottom: 12px;
  border-radius: 12px;
  overflow: hidden;
  background: #eef3f9;
}
.side-pic-list li:last-child { margin-bottom: 0; }
.side-pic-list img {
  width: 100%; height: 130px;
  object-fit: cover;
  transition: transform .6s cubic-bezier(.2, .7, .2, 1);
}
.side-pic-list a { display: block; position: relative; }
.side-pic-list li:hover img { transform: scale(1.06); }
.side-pic-list span {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 26px 12px 10px;
  background: linear-gradient(transparent, rgba(2, 6, 23, .86));
  color: #fff;
  font-size: 13px; line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------------- 侧栏：标签 ---------------- */
.tag-cloud {
  display: flex; flex-wrap: wrap; gap: 8px;
  padding: 14px 18px 20px;
}
.tag-cloud a {
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid #e5eaf2;
  background: #fff;
  color: #475569;
  font-size: 12.5px;
}
.tag-cloud a:hover { border-color: rgba(37, 99, 235, .45); color: var(--brand); background: #f5f9ff; }

/* ---------------- 正文页 ---------------- */
.article { padding: 30px 36px 34px; }
.art-tags { margin-bottom: 12px; }
.tag-pill {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: #eef4ff;
  color: var(--brand);
  font-size: 12px; font-weight: 600;
}
.art-title {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.4;
  font-weight: 800;
  letter-spacing: -.6px;
  color: var(--ink);
}
.art-meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px 22px;
  margin-top: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--faint);
}
.art-body {
  padding-top: 24px;
  font-size: 17px; line-height: 2;
  color: #26303f;
}
.art-body p { margin: 0 0 18px; }
.art-body h1, .art-body h2, .art-body h3, .art-body h4 { color: var(--ink); line-height: 1.5; }
.art-body h2 {
  margin: 30px 0 14px;
  padding-left: 14px;
  border-left: 4px solid var(--brand);
  font-size: 22px; font-weight: 800;
}
.art-body h3 { margin: 24px 0 12px; font-size: 18px; font-weight: 700; }
.art-body h4 { margin: 20px 0 10px; font-size: 16px; font-weight: 700; }
.art-body img { max-width: 100%; height: auto; border-radius: 14px; margin: 10px 0; }
.art-body a { color: var(--brand); text-decoration: underline; text-underline-offset: 3px; }
.art-body ul, .art-body ol { margin: 0 0 18px 22px; }
.art-body ul li { list-style: disc; }
.art-body ol li { list-style: decimal; }
.art-body blockquote {
  margin: 20px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--brand);
  border-radius: 0 12px 12px 0;
  background: #f5f9ff;
  color: #334155;
}
.art-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}
.art-body th, .art-body td { border: 1px solid var(--line); padding: 9px 12px; }
.art-body th { background: #f8fafc; color: var(--ink); }

.art-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
  margin-top: 26px;
  padding-top: 24px;
  border-top: 1px dashed #e8eef6;
}
.art-nav-item {
  padding: 14px 16px;
  border: 1px solid #eef3f9;
  border-radius: 12px;
  background: #f8fafc;
  font-size: 13.5px;
  color: #475569;
  min-width: 0;
}
.art-nav-item em {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  border-radius: 6px;
  background: #e8f1ff;
  color: var(--brand);
  font-size: 11.5px;
  font-weight: 600;
}
.art-nav-item a {
  display: inline;
  color: #1e293b;
}
.art-nav-item a:hover { color: var(--brand); }

/* ---------------- 底部 ---------------- */
.site-foot {
  position: relative;
  margin-top: 20px;
  background: #0b1220;
  color: #8ea1ba;
  font-size: 13px;
}
.site-foot::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad);
}
.foot-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  padding: 54px 0 42px;
}
.foot-col { min-width: 0; }
.foot-col h4 {
  margin-bottom: 16px;
  font-size: 15px; font-weight: 700;
  color: #fff;
}
.foot-logo {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 14px;
  color: #fff;
  font-size: 17px; font-weight: 800;
}
.foot-logo .logo-mark { width: 38px; height: 38px; flex: 0 0 38px; font-size: 20px; line-height: 38px; border-radius: 11px; }
.foot-about p { line-height: 1.9; margin-bottom: 8px; color: #8ea1ba; }
.foot-contact { color: #8ea1ba; }
.foot-list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; }
.foot-list li a { color: #8ea1ba; }
.foot-list li a:hover { color: #fff; }
.foot-bottom {
  padding: 18px 0 20px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  text-align: center;
  font-size: 12px;
  color: #6f849e;
}
.foot-bottom p { line-height: 1.9; }
.foot-bottom a { color: #8ea1ba; }
.foot-bottom a:hover { color: #fff; }
.foot-sites { word-break: break-all; }
.foot-sites a { margin: 0 4px; }
.foot-icp { word-break: break-all; }
.foot-icp a { letter-spacing: .2px; }

/* ---------------- 返回顶部 ---------------- */
.backtop {
  position: fixed; right: 24px; bottom: 36px; z-index: 120;
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: var(--grad);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 14px 28px -12px rgba(37, 99, 235, .85);
  opacity: 0; visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s ease, transform .25s ease, visibility .25s;
}
.backtop.show { opacity: 1; visibility: visible; transform: translateY(0); }
.backtop:hover { filter: brightness(1.06); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1120px) {
  .main-grid { grid-template-columns: minmax(0, 1fr) 312px; gap: 20px; }
  .hero-main .hero-item { height: 400px; }
  .nav-list li a { padding: 8px 11px; font-size: 14px; }
}

@media (max-width: 980px) {
  .site-nav { display: none; }
  .head-inner { height: 68px; }
  .head-cta { margin-left: auto; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-main .hero-item { height: 340px; }
  .hero-side { grid-template-columns: 1fr 1fr; grid-template-rows: none; }
  .hero-side .hero-item { height: 190px; }
  .main-grid { grid-template-columns: 1fr; gap: 18px; }
  .main-right {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    align-items: start;
  }
  .main-right .panel { margin-bottom: 0; }
  .news-list .thumb { flex: 0 0 180px; width: 180px; height: 114px; }
  .news-list.big .thumb { flex: 0 0 180px; width: 180px; height: 114px; }
  .foot-top { grid-template-columns: 1.4fr 1fr 1fr; gap: 28px; }
}

@media (max-width: 760px) {
  .hero-main .hero-item { height: 280px; }
  .hero-mask { padding: 18px 18px 16px; }
  .hero-mask strong { font-size: 19px; }
  .hero-info { display: none; }
  .news-list li { padding: 15px 16px; gap: 14px; }
  .news-list .thumb, .news-list.big .thumb { flex: 0 0 140px; width: 140px; height: 94px; }
  .news-txt h4, .news-list.big .news-txt h4 { font-size: 15.5px; }
  .news-txt .meta { margin-top: 8px; }
  .pic-grid { grid-template-columns: 1fr 1fr; padding: 16px; }
  .pic-grid li img { height: 140px; }
  .panel-head { height: 56px; padding: 0 16px; }
  .panel-title h3 { font-size: 16.5px; }
  .panel-title .en { display: none; }
  .article { padding: 22px 20px 26px; }
  .art-body { font-size: 16px; line-height: 1.9; }
  .art-nav { grid-template-columns: 1fr; }
  .list-banner-inner { padding: 26px 22px; }
  .main-right { grid-template-columns: 1fr; }
  .foot-top { grid-template-columns: 1fr; gap: 26px; padding: 40px 0 30px; }
  .channel-bar { gap: 6px; }
}

@media (max-width: 560px) {
  .topbar-hint, .topbar-sep, .topbar-right a:last-child { display: none; }
  .head-inner { height: 62px; gap: 12px; }
  .logo-mark { width: 38px; height: 38px; flex: 0 0 38px; font-size: 20px; line-height: 38px; border-radius: 11px; }
  .logo-text { font-size: 17px; }
  .logo-text em { font-size: 8.5px; letter-spacing: .2em; }
  .head-cta { padding: 7px 13px; font-size: 12px; }
  .hero-side { grid-template-columns: 1fr; gap: 12px; }
  .hero-side .hero-item { height: 160px; }
  .hero-main .hero-item { height: 240px; }
  .hero-mask strong { font-size: 17px; }
  .ticker { padding: 8px 12px; gap: 10px; }
  .ticker-list { gap: 18px; }
  .news-list .thumb, .news-list.big .thumb { flex: 0 0 112px; width: 112px; height: 78px; }
  .news-txt p { display: none; }
  .news-txt h4, .news-list.big .news-txt h4 { font-size: 14.5px; }
  .news-txt .meta { font-size: 11.5px; }
  .pic-grid { grid-template-columns: 1fr; }
  .pic-grid li img { height: 168px; }
  .cat-list { grid-template-columns: 1fr; }
  .art-title { font-size: 21px; letter-spacing: -.3px; }
  .art-meta { gap: 4px 14px; font-size: 12px; }
  .list-banner-inner { padding: 22px 18px; border-radius: 16px; }
  .foot-list { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}