:root {
  --brand: #0a5adb;
  --brand-dark: #063ea0;
  --brand-soft: #eef4ff;
  --accent: #ff6a00;
  --ink: #17202e;
  --ink-2: #47536b;
  --ink-3: #6b7686;
  --line: #e4e9f2;
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(16, 32, 66, .08);
  --maxw: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- performance ---------- */
/* 首屏外的区块延迟渲染，减少首次渲染的计算量 */
main > .section { content-visibility: auto; contain-intrinsic-size: auto 900px; }
.site-footer { content-visibility: auto; contain-intrinsic-size: auto 520px; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: #fff;
  padding: 10px 16px;
  z-index: 99;
}
.skip:focus { left: 12px; top: 12px; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid var(--line);
  contain: layout paint;
}
@supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .site-header { background: rgba(255, 255, 255, .82); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 66px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  white-space: nowrap;
}
.logo:hover { text-decoration: none; }
.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--brand), #31a1ff);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 15px;
  font-weight: 700;
}
.nav { margin-left: auto; }
.nav ul {
  display: flex;
  gap: 26px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav a {
  color: var(--ink-2);
  font-size: 15px;
  font-weight: 500;
}
.nav a[aria-current="page"] {
  color: var(--brand);
  font-weight: 700;
}

/* ---------- media assets ---------- */
.logo-mark-img {
  height: 36px;
  width: auto;
  display: block;
}
.hero .wrap.hero-inner { padding-bottom: 0; }

/* 首屏文案：居中，宽度收敛 */
.hero-copy { max-width: 62em; margin: 0 auto; text-align: center; }
.hero-copy h1 { margin-left: auto; margin-right: auto; max-width: 22em; }
.hero-copy .lede { margin-left: auto; margin-right: auto; }
.hero-copy .hero-actions { justify-content: center; }
.hero-copy .hero-trust { justify-content: center; }

/* 首屏截图：与内容区等宽对齐，顶格向下延伸到区块底部 */
.hero-media {
  width: 100%;
  margin: 44px 0 0;
  position: relative;
}
.hero-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px 16px 0 0;
  border: 1px solid var(--line);
  border-bottom: 0;
  box-shadow: 0 24px 60px rgba(16, 32, 66, .12);
}
figure.showcase { margin: 34px 0 0; }
figure.showcase img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
figure.showcase figcaption {
  font-size: 13px;
  color: #667;
  padding: 12px 4px 0;
  text-align: center;
}
.qr-block {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 14px;
}
.qr-block img {
  width: 92px;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--line);
}
.qr-block p { font-size: 13px; color: #667; margin: 0; }
.post-thumb {
  width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--line);
  margin-bottom: 4px;
}
/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--brand), #2f8bff);
  color: #fff;
  box-shadow: 0 8px 20px rgba(10, 90, 219, .28);
}
.btn-ghost {
  background: #fff;
  color: var(--brand);
  border-color: #c9d9f7;
}
.btn-sm { padding: 9px 18px; font-size: 14px; }

/* ---------- hero ---------- */
.hero {
  background:
    radial-gradient(1000px 420px at 12% -10%, #e3efff 0%, rgba(227, 239, 255, 0) 60%),
    linear-gradient(180deg, #f9fbff 0%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
}
.hero-inner { padding: 64px 0 56px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-dark);
  background: var(--brand-soft);
  border: 1px solid #d6e4ff;
  padding: 6px 14px;
  border-radius: 999px;
}
h1 {
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1.25;
  letter-spacing: -.5px;
  margin: 20px 0 16px;
  max-width: 20em;
}
.lede {
  font-size: 17px;
  color: var(--ink-2);
  max-width: 44em;
  margin: 0 0 26px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
  color: var(--ink-2);
}
.hero-trust li::before { content: "✓"; color: var(--brand); font-weight: 700; margin-right: 6px; }
.hero-tagline { font-size: 17px; font-weight: 700; color: var(--ink); margin: 16px 0 10px; }
.hero-copy h1.hero-slogan {
  max-width: 24em;
  font-size: clamp(36px, 5.6vw, 52px);
  line-height: 1.32;
  font-weight: 800;
  letter-spacing: .01em;
  margin: 0 auto 18px;
}
h1.hero-slogan span { display: block; color: var(--brand); }

/* ---------- sections ---------- */
.section { padding: 64px 0; }
.section-soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 46em; margin-bottom: 32px; }
h2 {
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.35;
  letter-spacing: -.3px;
  margin: 0 0 12px;
}
.section-head > p { color: var(--ink-2); font-size: 16px; margin: 0; }
h3 { font-size: 18px; margin: 0 0 8px; letter-spacing: -.2px; }
h4 { font-size: 15px; margin: 0 0 6px; color: var(--brand-dark); }
p { margin: 0 0 14px; }
.note {
  font-size: 13px;
  color: #667;
  background: #fff;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 10px 14px;
}

/* ---------- grids ---------- */
.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 2px 8px rgba(16, 32, 66, .04);
}
.card h3 { margin-bottom: 10px; }
.card p { color: var(--ink-2); font-size: 15px; margin-bottom: 10px; }
.card ul { margin: 0; padding-left: 18px; color: var(--ink-2); font-size: 14px; }
.card ul li { margin-bottom: 4px; }
.card-index {
  font-size: 13px;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: .08em;
}
.card-soft { background: var(--bg-soft); }

/* ---------- table ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}
table { border-collapse: collapse; width: 100%; min-width: 640px; font-size: 15px; }
caption {
  text-align: left;
  padding: 14px 18px;
  font-size: 13px;
  color: #667;
  border-bottom: 1px solid var(--line);
}
th, td { padding: 14px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
thead th { background: var(--brand-soft); color: var(--brand-dark); font-size: 14px; white-space: nowrap; }
tbody tr:last-child td, tbody tr:last-child th { border-bottom: 0; }
tbody th { font-weight: 600; color: var(--ink); }
td em { color: var(--brand); font-style: normal; font-weight: 600; }

/* ---------- timeline ---------- */
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li {
  position: relative;
  padding: 0 0 22px 28px;
  border-left: 2px solid #d9e4f7;
}
.timeline li:last-child { border-left-color: transparent; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px var(--brand-soft);
}
.time-date { font-size: 13px; font-weight: 700; color: var(--brand-dark); }

/* ---------- quotes ---------- */
blockquote.review {
  margin: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: 12px;
  padding: 20px 22px;
}
blockquote.review p { font-size: 15px; color: var(--ink-2); margin-bottom: 12px; }
.review-meta { font-size: 13px; color: #667; }

/* ---------- badges ---------- */
.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
}
.badge-warn { background: #fff4e6; color: #a1530b; }
.badge-off { background: #f1f3f7; color: #6b7280; }

/* ---------- faq ---------- */
details.faq {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  margin-bottom: 12px;
  overflow: hidden;
}
details.faq summary {
  cursor: pointer;
  padding: 16px 20px;
  font-weight: 600;
  font-size: 16px;
  list-style: none;
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after {
  content: "+";
  float: right;
  color: var(--brand);
  font-size: 20px;
  line-height: 1;
}
details.faq[open] summary::after { content: "–"; }
details.faq[open] summary { border-bottom: 1px solid var(--line); }
.faq-body { padding: 16px 20px; color: var(--ink-2); font-size: 15px; }
.faq-body p:last-child { margin-bottom: 0; }

/* ---------- steps ---------- */
.steps { counter-reset: s; list-style: none; margin: 0; padding: 0; }
.steps li {
  counter-increment: s;
  position: relative;
  padding: 0 0 22px 54px;
  border-left: 2px solid #d9e4f7;
  margin-left: 15px;
}
.steps li:last-child { border-left-color: transparent; padding-bottom: 0; }
.steps li::before {
  content: counter(s);
  position: absolute;
  left: -16px;
  top: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 700;
}

/* ---------- platform tabs ---------- */
.platform-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}
.platform-bar button {
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid #cfdcf5;
  background: #fff;
  color: var(--ink-2);
}
.platform-bar button[aria-selected="true"] {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}
.panel[hidden] { display: none; }

/* ---------- news layout ---------- */
.layout-side {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: start;
}
.tag-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.tag-bar button {
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-2);
}
.tag-bar button.is-active { background: var(--ink); border-color: var(--ink); color: #fff; }
.post-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.post-card[hidden] { display: none; }
.post-meta { display: flex; gap: 10px; align-items: center; font-size: 13px; color: #667; }
.post-card p { color: var(--ink-2); font-size: 15px; margin: 0 0 6px; }
details.more summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--brand);
}
details.more ul { margin: 10px 0 0; padding-left: 18px; color: var(--ink-2); font-size: 14px; }
.side-card { padding: 22px; }
.rank { counter-reset: r; list-style: none; margin: 0; padding: 0; }
.rank li {
  counter-increment: r;
  display: flex;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}
.rank li:last-child { border-bottom: 0; }
.rank li::before {
  content: counter(r);
  flex: 0 0 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 700;
}
.rank a { color: var(--ink); }

/* ---------- cta band ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--brand-dark), var(--brand) 55%, #2f8bff);
  color: #fff;
  border-radius: 22px;
  padding: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
}
.cta-band .cta-title { color: #fff; font-size: clamp(20px, 2.4vw, 26px); font-weight: 700; line-height: 1.35; margin: 0 0 6px; }
.cta-band p { color: #e6efff; margin: 0; }
.cta-band .btn-primary { background: #fff; color: var(--brand-dark); box-shadow: none; }
.cta-band .btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .6); }

/* ---------- breadcrumb ---------- */
.crumbs { font-size: 13px; color: #667; padding: 14px 0; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; }
.crumbs li + li::before { content: "/"; margin-right: 8px; color: #b9c3d3; }

/* ---------- footer ---------- */
.site-footer {
  background: #101a2c;
  color: #c3cddd;
  padding: 46px 0 26px;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 26px;
}
.site-footer h3 { color: #fff; font-size: 15px; margin-bottom: 12px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: #c3cddd; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .12);
  margin-top: 30px;
  padding-top: 18px;
  font-size: 13px;
  color: #8f9cb4;
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .layout-side { grid-template-columns: 1fr; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .nav ul { gap: 16px; }
  .header-inner { gap: 12px; }
  .cta-band { padding: 26px; }
  .footer-grid { grid-template-columns: 1fr; }
}