:root {
  --primary: #2f5bff;
  --primary-dark: #1d3fd8;
  --accent: #8a5cff;
  --cyan: #22d3ee;
  --ink: #0b1030;
  --ink-2: #111840;
  --text: #28304e;
  --muted: #67708f;
  --bg-soft: #f5f7ff;
  --border: #e6e9f7;
  --grad: linear-gradient(120deg, #2f5bff 0%, #8a5cff 100%);
  --grad-soft: linear-gradient(120deg, rgba(47,91,255,.08), rgba(138,92,255,.08));
  --shadow-sm: 0 4px 16px rgba(23,37,116,.06);
  --shadow: 0 12px 34px rgba(23,37,116,.10);
  --shadow-lg: 0 24px 60px rgba(23,37,116,.16);
  --radius: 16px;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: #fff;
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 { color: var(--ink); font-weight: 700; letter-spacing: -.01em; }
a { text-decoration: none; transition: all .25s ease; }
img { max-width: 100%; }
::selection { background: rgba(47,91,255,.18); }

/* ---------- 通用工具 ---------- */
.text-grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.section { padding: 92px 0; }
.section-sm {padding: 30px}
.bg-soft { background: var(--bg-soft); }
.bg-ink { background: var(--ink); }
.bg-grad-deep { background: linear-gradient(135deg, #0b1030 0%, #151b4d 55%, #241a5e 100%); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .82rem; font-weight: 700; letter-spacing: .14em;
  color: var(--primary); text-transform: uppercase;
  background: rgba(47,91,255,.08); border: 1px solid rgba(47,91,255,.18);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 18px;
}
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--grad); }
.eyebrow.on-dark { color: #9db4ff; background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.16); }
.section-head { max-width: 720px; }
.section-head h2 { font-size: clamp(1.7rem, 3.2vw, 2.5rem); line-height: 1.25; margin-bottom: 14px; }
.section-head p { color: var(--muted); font-size: 1.05rem; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head .eyebrow { margin-bottom: 14px; }

/* ---------- 按钮 ---------- */
.btn { border-radius: 10px; font-weight: 600; padding: .62rem 1.4rem; }
.btn-lg { padding: .8rem 1.8rem; font-size: 1.02rem; border-radius: 12px; }
.btn-grad { background: var(--grad); color: #fff; border: none; box-shadow: 0 8px 22px rgba(77,84,255,.32); }
.btn-grad:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 12px 30px rgba(77,84,255,.42); }
.btn-ghost { background: rgba(255,255,255,.08); color: #fff; border: 1px solid rgba(255,255,255,.28); backdrop-filter: blur(6px); }
.btn-ghost:hover { background: rgba(255,255,255,.16); color: #fff; transform: translateY(-2px); }
.btn-outline-brand { border: 1.6px solid var(--primary); color: var(--primary); }
.btn-outline-brand:hover { background: var(--primary); color: #fff; }

/* ---------- 顶栏导航 ---------- */
.navbar-site {
  padding: 14px 0; background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(230,233,247,.7);
  transition: box-shadow .3s ease;
}
.navbar-site.scrolled { box-shadow: 0 10px 30px rgba(23,37,116,.08); }

.navbar-site .nav-link { font-weight: 600; color: #39405e; margin: 0 6px; padding: .5rem .7rem !important; position: relative; }
.navbar-site .nav-link::after {
  content: ""; position: absolute; left: .7rem; right: .7rem; bottom: 2px; height: 2px;
  background: var(--grad); border-radius: 2px; transform: scaleX(0); transform-origin: left; transition: transform .28s ease;
}
.navbar-site .nav-link:hover, .navbar-site .nav-link.active { color: var(--primary); }
.navbar-site .nav-link:hover::after, .navbar-site .nav-link.active::after { transform: scaleX(1); }
.navbar-site .dropdown-menu { border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow); padding: 8px; margin-top: 10px; min-width: 230px; }
.navbar-site .dropdown-item { border-radius: 9px; padding: 8px 14px; font-weight: 500; color: var(--text); font-size: .95rem; }
.navbar-site .dropdown-item:hover { background: var(--grad-soft); color: var(--primary); }
.navbar-site .btn-nav-cta { padding: .5rem 1.15rem; border-radius: 10px; }
.navbar-toggler { border: none; color: var(--ink); }
.navbar-toggler:focus { box-shadow: none; }
.navbar-toggler i { font-size: 1.6rem; line-height: 1; }

/* ---------- 页头 Hero（首页） ---------- */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(150deg, #0b1030 0%, #101a4d 48%, #2a1a63 100%);
  color: #fff; padding: 120px 0 110px;
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 58px 58px;
  mask-image: radial-gradient(ellipse at 30% 30%, #000 10%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 30% 30%, #000 10%, transparent 70%);
}
.hero .orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: .5; pointer-events: none; }
.hero .orb-1 { width: 420px; height: 420px; background: #2f5bff; top: -140px; right: -80px; }
.hero .orb-2 { width: 380px; height: 380px; background: #8a5cff; bottom: -160px; left: 30%; }
.hero h1 { color: #fff; font-size: clamp(2.1rem, 4.6vw, 3.5rem); line-height: 1.22; font-weight: 800; }
.hero .lead-lg { color: rgba(255,255,255,.78); font-size: 1.15rem; }
.hero .hero-tag {
  display: inline-flex; align-items: center; gap: 8px; color: #c9d4ff;
  background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.16);
  padding: 6px 16px; border-radius: 999px; font-size: .88rem; margin-bottom: 26px;
}
.hero .hero-tag .dot { width: 8px; height: 8px; border-radius: 50%; background: #34d399; box-shadow: 0 0 0 4px rgba(52,211,153,.22); animation: pulse-dot 2s infinite; }
@keyframes pulse-dot { 0%,100%{ box-shadow:0 0 0 3px rgba(52,211,153,.25);} 50%{ box-shadow:0 0 0 7px rgba(52,211,153,.08);} }
.hero .hero-meta { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 30px; color: rgba(255,255,255,.65); font-size: .92rem; }
.hero .hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero .hero-meta i { color: var(--cyan); }

/* AI 对话示意卡 */
.ai-demo {
  position: relative; background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.14); border-radius: 22px;
  backdrop-filter: blur(10px); padding: 22px; box-shadow: var(--shadow-lg);
}
.ai-demo .ai-bar { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; padding-bottom: 14px; border-bottom: 1px solid rgba(255,255,255,.1); }
.ai-demo .ai-dot { width: 10px; height: 10px; border-radius: 50%; }
.ai-demo .ai-search { border-radius: 12px; background: rgba(255,255,255,.08); padding: 10px 14px; color: rgba(255,255,255,.85); font-size: .9rem; margin-bottom: 14px; border: 1px solid rgba(255,255,255,.1); }
.ai-demo .ai-q { border-radius: 14px 14px 14px 4px; background: var(--grad); padding: 10px 15px; color: #fff; font-size: .92rem; margin-left: auto; max-width: 82%; }
.ai-demo .ai-a { border-radius: 14px 14px 4px 14px; background: rgba(255,255,255,.1); padding: 14px 16px; color: rgba(255,255,255,.92); font-size: .9rem; margin-top: 12px; border: 1px solid rgba(255,255,255,.1); }
.ai-demo .cite { display: inline-flex; align-items: center; gap: 6px; margin-top: 10px; background: rgba(52,211,153,.14); border: 1px solid rgba(52,211,153,.35); color: #6ee7b7; font-size: .8rem; border-radius: 999px; padding: 4px 12px; }
.ai-demo .cite i { font-size: .8rem; }
.ai-demo .ai-note { margin-top: 14px; font-size: .78rem; color: rgba(255,255,255,.5); display: flex; align-items: center; gap: 6px; }
.ai-float { position: absolute; top: -16px; right: -10px; background: #fff; color: var(--primary); font-weight: 800; font-size: .82rem; padding: 8px 14px; border-radius: 12px; box-shadow: var(--shadow); animation: floaty 3.4s ease-in-out infinite; }
.ai-float.two { top: auto; bottom: -14px; right: 26px; animation-delay: 1.6s; }
@keyframes floaty { 0%,100%{ transform: translateY(0);} 50%{ transform: translateY(-9px);} }

/* ---------- 内页 Banner ---------- */
.page-banner {
  position: relative; overflow: hidden; color: #fff;
  background: linear-gradient(140deg, #0b1030, #171f5e 55%, #2b1b6b);
  padding: 78px 0 68px;
}
.page-banner::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 52px 52px; pointer-events: none;
}
.page-banner::after {
  content: ""; position: absolute; width: 460px; height: 460px; border-radius: 50%;
  background: radial-gradient(circle, rgba(138,92,255,.4), transparent 65%); top: -180px; right: -120px; pointer-events: none;
}
.page-banner h1 { color: #fff; font-size: clamp(1.9rem, 3.4vw, 2.7rem); font-weight: 800; }
.page-banner .breadcrumb { --bs-breadcrumb-divider-color: rgba(255,255,255,.4); margin-bottom: 0; }
.page-banner .breadcrumb a, .page-banner .breadcrumb-item.active { color: rgba(255,255,255,.66); }
.page-banner .breadcrumb a:hover { color: #fff; }
.page-banner .banner-sub { color: rgba(255,255,255,.72); max-width: 640px; margin-top: 10px; }

/* ---------- 图标框 / 特性卡 ---------- */
.icon-box { width: 58px; height: 58px; border-radius: 16px; display: inline-flex; align-items: center; justify-content: center; background: var(--grad); color: #fff; font-size: 1.5rem; box-shadow: 0 10px 22px rgba(77,84,255,.3); flex: none; }
.icon-box.lg { width: 72px; height: 72px; font-size: 1.9rem; border-radius: 20px; }
.icon-box.soft { background: var(--grad-soft); color: var(--primary); box-shadow: none; border: 1px solid rgba(47,91,255,.14); }
.feature-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 26px; height: 100%; transition: all .3s ease; position: relative; overflow: hidden;
}
.feature-card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--grad); transform: scaleX(0); transform-origin: left; transition: transform .35s ease; }
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.feature-card:hover::before { transform: scaleX(1); }
.feature-card h3 { font-size: 1.18rem; margin: 20px 0 10px; }
.feature-card p { color: var(--muted); font-size: .95rem; margin-bottom: 0; }
.feature-card .link-more { font-weight: 600; font-size: .9rem; color: var(--primary); }
.feature-card .link-more i { transition: transform .25s ease; display: inline-block; }
.feature-card:hover .link-more i { transform: translateX(4px); }

/* ---------- 数据块 ---------- */
.stat-block { text-align: center; padding: 10px 6px; }
.stat-block .num { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; color: var(--ink); line-height: 1.15; }
.stat-block .num sup { font-size: 1.2rem; color: var(--primary); }
.stat-block .label { color: var(--muted); font-size: .95rem; margin-top: 6px; }
.stat-card { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius); padding: 26px 16px; }
.stat-card .num { color: #fff;font-size:20px}
.stat-card .label { color: rgba(255,255,255,.6); }

/* ---------- 对比表 ---------- */
.compare-table { border: 1px solid var(--border); border-radius: 20px; overflow: hidden; background: #fff; box-shadow: var(--shadow-sm); }
.compare-table .row { margin: 0; }
.compare-table .col-box { padding: 0; }
.compare-table .head { padding: 18px 24px; font-weight: 800; font-size: 1.12rem; }
.compare-table .head.seo { background: #f1f4ff; color: var(--ink); }
.compare-table .head.geo { background: var(--grad); color: #fff; }
.compare-table .cell { padding: 13px 24px; border-top: 1px solid var(--border); min-height: 54px; display: flex; align-items: center; font-size: .95rem; }
.compare-table .cell.dim { background: #fafbff; color: var(--muted); font-weight: 600; font-size: .88rem; justify-content: space-between; }
.compare-table .cell .ok { color: #10b981; }
.compare-table .cell .no { color: #f43f5e; }


/* ---------- 流程 ---------- */
.step-card { text-align: center; position: relative; padding: 8px 10px; }
.step-card .step-no { width: 54px; height: 54px; line-height: 54px; border-radius: 50%; background: var(--grad); color: #fff; font-weight: 800; font-size: 1.2rem; margin: 0 auto 16px; box-shadow: 0 10px 22px rgba(77,84,255,.32); position: relative; z-index: 1; }
.step-card h4 { font-size: 1.05rem; }
.step-card p { color: var(--muted); font-size: .9rem; }
.step-line { position: absolute; top: 35px; left: calc(50% + 40px); width: calc(100% - 80px); height: 2px; background: repeating-linear-gradient(90deg, rgba(47,91,255,.35) 0 6px, transparent 6px 12px); }

/* ---------- 案例卡 ---------- */
.case-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; height: 100%; display: flex; flex-direction: column; transition: all .3s ease; }
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.case-card .case-thumb { aspect-ratio: 16/9; overflow: hidden; position: relative; }
.case-card .case-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.case-card:hover .case-thumb img { transform: scale(1.06); }
.case-card .case-thumb .tag { position: absolute; left: 14px; top: 14px; z-index: 2; background: rgba(11,16,48,.72); color: #fff; backdrop-filter: blur(6px); font-size: .78rem; border-radius: 999px; padding: 4px 12px; }
.case-card .case-body { padding: 22px 22px 8px; display: flex; flex-direction: column; flex: 1; }
.case-card .case-body h3 { font-size: 1.1rem; }
.case-card .case-body p { color: var(--muted); font-size: .92rem; flex: 1; }
.case-results { display: flex; border-top: 1px dashed var(--border); padding: 12px 22px 18px; gap: 22px; }
.case-results .cr { font-size: .8rem; color: var(--muted); }
.case-results .cr b { display: block; font-size: 1.32rem; color: var(--primary); font-weight: 800; }
.case-results .cr b small { font-size: .85rem; }

/* ---------- 新闻卡 ---------- */
.news-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; height: 100%; display: flex; flex-direction: column; transition: all .3s ease; }
.news-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.news-card .news-thumb { aspect-ratio: 16/10; overflow: hidden; position: relative; }
.news-card .news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.news-card:hover .news-thumb img { transform: scale(1.06); }
.news-card .news-cat { position: absolute; left: 14px; top: 14px; background: var(--grad); color: #fff; font-size: .76rem; border-radius: 999px; padding: 4px 12px; font-weight: 600; }
.news-card .news-body { padding: 20px 22px 6px; display: flex; flex-direction: column; flex: 1; }
.news-card .news-body h3 { font-size: 1.06rem; line-height: 1.5; margin-bottom: 8px; }
.news-card .news-body h3 a { color: var(--ink); }
.news-card .news-body h3 a:hover { color: var(--primary); }
.news-card .news-body p { color: var(--muted); font-size: .9rem; flex: 1; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card .news-meta { border-top: 1px dashed var(--border); padding: 12px 22px 16px; display: flex; justify-content: space-between; color: var(--muted); font-size: .82rem; }
.news-card .news-meta i { margin-right: 4px; }

/* ---------- 侧栏 ---------- */
.sidebar-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 24px; }
.sidebar-card .sc-title { font-size: 1.08rem; font-weight: 800; color: var(--ink); margin-bottom: 16px; padding-left: 12px; border-left: 4px solid; border-image: var(--grad) 1; }
.sidebar-list li { display: flex; align-items: center; gap: 10px; padding: 9px 0; border-bottom: 1px dashed var(--border); font-size: .92rem; }
.sidebar-list li:last-child { border-bottom: 0; }
.sidebar-list li a { color: var(--text); }
.sidebar-list li a:hover { color: var(--primary); }
.sidebar-list li .d { margin-left: auto; color: #a0a7c0; font-size: .8rem; flex: none; }
.hot-rank { width: 22px; height: 22px; border-radius: 6px; background: var(--grad-soft); color: var(--primary); font-weight: 800; font-size: .78rem; display: inline-flex; align-items: center; justify-content: center; flex: none; }
.hot-rank.r1, .hot-rank.r2, .hot-rank.r3 { background: var(--grad); color: #fff; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-cloud a { font-size: .82rem; color: var(--muted); background: var(--bg-soft); border: 1px solid var(--border); border-radius: 999px; padding: 5px 13px; }
.tag-cloud a:hover { background: var(--grad); color: #fff; border-color: transparent; }
.cta-mini { background: var(--grad); color: #fff; border-radius: var(--radius); padding: 24px; text-align: center; }
.cta-mini h5 { color: #fff; }
.cta-mini p { font-size: .9rem; color: rgba(255,255,255,.85); }

/* ---------- 文章正文 ---------- */
.article-body { font-size: 1.03rem; color: #3a4163; line-height: 2; }
.article-body h2, .article-body h3 { margin-top: 38px; margin-bottom: 16px; }
.article-body h2 { font-size: 1.45rem; }
.article-body h3 { font-size: 1.2rem; }
.article-body p { margin-bottom: 18px; }
.article-body ul, .article-body ol { margin-bottom: 18px; padding-left: 22px; }
.article-body li { margin-bottom: 6px; }
.article-body blockquote {
  border-left: 4px solid var(--primary); background: var(--bg-soft);
  padding: 18px 22px; border-radius: 0 12px 12px 0; color: var(--ink);
  font-weight: 600; margin: 26px 0; font-size: 1rem;
}
.article-body img { border-radius: 14px; margin: 12px 0; }
.article-body .fig-cap { text-align: center; color: var(--muted); font-size: .85rem; margin: -8px 0 22px; }
.article-body table { width: 100%; border-collapse: collapse; margin: 22px 0; font-size: .95rem; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: 10px 14px; }
.article-body th { background: var(--bg-soft); font-weight: 700; color: var(--ink); }
.article-body code { background: #eef1ff; color: var(--primary-dark); padding: 2px 8px; border-radius: 6px; font-size: .88em; }

/* ---------- 作者卡 / 标签 ---------- */
.author-card { display: flex; gap: 18px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.author-avatar { width: 64px; height: 64px; border-radius: 50%; background: var(--grad); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: 1.5rem; font-weight: 800; flex: none; }
.author-card h5 { margin-bottom: 2px; }
.author-card .role { color: var(--primary); font-size: .82rem; font-weight: 600; }
.author-card p { color: var(--muted); font-size: .9rem; margin: 6px 0 0; }
.article-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.article-tags a { background: var(--bg-soft); border: 1px solid var(--border); color: var(--muted); font-size: .82rem; padding: 4px 12px; border-radius: 999px; }
.article-tags a:hover { background: var(--grad); color: #fff; }
.pager-box { display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; }
.pager-box .pg { flex: 1; min-width: 220px; border: 1px solid var(--border); border-radius: 12px; padding: 14px 18px; color: var(--text); background: #fff; }
.pager-box .pg:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.pager-box .pg .dir { font-size: .78rem; color: var(--muted); }
.pager-box .pg .t { font-weight: 600; color: var(--ink); font-size: .92rem; display: block; }
.pager-box .pg.next { text-align: right; }

/* ---------- 表单 ---------- */
.form-control, .form-select { border-radius: 10px; padding: .68rem 1rem; border-color: var(--border); }
.form-control:focus, .form-select:focus { border-color: var(--primary); box-shadow: 0 0 0 .22rem rgba(47,91,255,.14); }
.form-label { font-weight: 600; color: var(--ink); font-size: .92rem; }
.contact-info-card { background: var(--ink); background-image: linear-gradient(150deg, #0b1030, #1a2260 60%, #2c1c6d); border-radius: 20px; padding: 34px 30px; color: rgba(255,255,255,.8); }
.contact-info-card h4 { color: #fff; margin-bottom: 6px; }
.contact-info-card .ci-item { display: flex; gap: 14px; padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.09); align-items: flex-start; }
.contact-info-card .ci-item:last-child { border-bottom: 0; }
.contact-info-card .ci-icon { width: 42px; height: 42px; border-radius: 12px; background: rgba(255,255,255,.08); color: #8fb0ff; display: inline-flex; align-items: center; justify-content: center; font-size: 1.15rem; flex: none; }
.contact-info-card a { color: rgba(255,255,255,.8); }
.contact-info-card a:hover { color: #fff; }

/* ---------- FAQ ---------- */
.accordion-item { border: 1px solid var(--border) !important; border-radius: 14px !important; overflow: hidden; margin-bottom: 14px; }
.accordion-button { font-weight: 700; color: var(--ink); padding: 18px 22px; font-size: 1.02rem; background: #fff; box-shadow: none !important; }
.accordion-button:not(.collapsed) { color: var(--primary); background: var(--grad-soft); }
.accordion-button::after { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%232f5bff' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E"); }
.accordion-body { color: var(--muted); padding: 6px 22px 20px; }

/* ---------- 页脚 ---------- */
.footer { background: #080d26; color: rgba(255,255,255,.66); padding: 74px 0 0; font-size: .95rem; }
.footer h5 { color: #fff; font-size: 1.02rem; margin-bottom: 20px; position: relative; padding-bottom: 10px; }
.footer h5::after { content: ""; position: absolute; left: 0; bottom: 0; width: 30px; height: 3px; border-radius: 2px; background: var(--grad); }
.footer a { color: rgba(255,255,255,.66); }
.footer a:hover { color: #fff; }
.footer .f-links li { padding: 5px 0; }
.footer .f-links li a i { font-size: .7rem; color: #5d6bb8; margin-right: 6px; }
.footer .f-about p { margin-top: 16px; }
.footer .f-contact li { display: flex; gap: 10px; padding: 6px 0; align-items: flex-start; }
.footer .f-contact i { color: #5d6bb8; margin-top: 5px; }
.footer .f-social { display: flex; gap: 10px; margin-top: 18px; }
.footer .f-social a { width: 38px; height: 38px; border-radius: 10px; background: rgba(255,255,255,.07); display: inline-flex; align-items: center; justify-content: center; }
.footer .f-social a:hover { background: var(--grad); transform: translateY(-3px); }
.footer .copyright { border-top: 1px solid rgba(255,255,255,.08); padding: 20px 0; margin-top: 56px; font-size: .85rem; color: rgba(255,255,255,.45); }
.footer .f-tag { display: inline-block; background: rgba(255,255,255,.06); color: rgba(255,255,255,.6); font-size: .8rem; padding: 4px 12px; border-radius: 999px; margin: 0 6px 8px 0; }

/* ---------- 回顶 / 其他 ---------- */
.backtop {
  position: fixed; right: 22px; bottom: 24px; width: 46px; height: 46px; border-radius: 13px;
  background: var(--grad); color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 1.15rem; box-shadow: var(--shadow); opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: all .3s ease; z-index: 1050; border: none;
}
.backtop.show { opacity: 1; visibility: visible; transform: translateY(0); }
.backtop:hover { color: #fff; transform: translateY(-4px); }

.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* 404：body 采用纵向弹性布局，main 撑满剩余高度、footer 贴底（避免与 footer 横向并排） */
.page-404 { background: var(--bg-soft); min-height: 100vh; display: flex; flex-direction: column; }
.page-404 main { flex: 1 1 auto; display: flex; align-items: center; }
.page-404 .code { font-size: clamp(6rem, 16vw, 10rem); font-weight: 900; line-height: 1; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- 响应式微调 ---------- */
@media (max-width: 991.98px) {
  .section { padding: 66px 0; }
  .hero { padding: 84px 0 90px; }
  .timeline::before { left: 14px; }
  .tl-item { padding-left: 48px; }
  .tl-year { position: static; text-align: left; margin-bottom: 6px; }
  .tl-dot { left: 7px; }
  .step-line { display: none; }
  .navbar-site .nav-link::after { display: none; }
  .navbar-site .nav-cta-wrap { padding: 10px 0; }
}
@media (max-width: 575.98px) {
  .section { padding: 54px 0; }
  .hero { padding: 64px 0 70px; }
  .ai-float { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}