:root {
  --c1: #0B4F8C;
  --c2: #1A7AD4;
  --bg: #F0F5FA;
  --ink: #142033;
  --line: #D6E2EE;
  --muted: #4A5A70;
  --card: #FFFFFF;
  --accent: #E8F1FB;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c2); text-decoration: none; }
a:hover { text-decoration: underline; }

img, svg { display: block; max-width: 100%; }

@keyframes spin { to { transform: rotate(360deg); } }

/* ===== TOP NAV ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(11, 79, 140, 0.03);
}
.topbar-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 20px;
  color: var(--c1);
  letter-spacing: 0.5px;
}
.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}
.mainnav {
  display: flex;
  gap: 8px;
  align-items: center;
}
.mainnav a {
  padding: 8px 18px;
  border-radius: 999px;
  color: var(--ink);
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
}
.mainnav a:hover { background: var(--accent); text-decoration: none; }
.mainnav a.on {
  background: linear-gradient(135deg, var(--c1), var(--c2));
  color: #fff;
}

/* ===== HERO ===== */
.hero {
  background: linear-gradient(135deg, #062f57 0%, var(--c1) 45%, var(--c2) 100%);
  color: #fff;
  padding: 90px 24px 100px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.14), rgba(255,255,255,0));
}
.hero-inner {
  max-width: 1120px;
  margin: 0 auto;
  position: relative;
}
.hero-eyebrow {
  display: inline-block;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.25);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 1px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: 44px;
  line-height: 1.25;
  margin: 0 0 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.hero p.lead {
  font-size: 18px;
  max-width: 780px;
  margin: 0 0 32px;
  color: rgba(255,255,255,0.92);
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
}
.btn-primary {
  background: #FFFFFF;
  color: var(--c1);
  box-shadow: 0 8px 24px rgba(3, 20, 40, 0.25);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 28px rgba(3, 20, 40, 0.32); }
.btn-ghost {
  background: rgba(255,255,255,0.08);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.55);
}
.btn-ghost:hover { background: rgba(255,255,255,0.16); }
.btn-solid {
  background: linear-gradient(135deg, var(--c1), var(--c2));
  color: #fff;
  box-shadow: 0 8px 24px rgba(11, 79, 140, 0.28);
}
.btn-solid:hover { transform: translateY(-1px); box-shadow: 0 12px 28px rgba(11, 79, 140, 0.36); }
.btn-outline {
  background: #fff;
  color: var(--c1);
  border: 1px solid var(--c1);
}
.btn-outline:hover { background: var(--accent); }

/* ===== SECTION SHELL ===== */
.section {
  padding: 80px 24px;
}
.section-inner {
  max-width: 1120px;
  margin: 0 auto;
}
.section-title {
  font-size: 30px;
  color: var(--c1);
  margin: 0 0 12px;
  font-weight: 700;
}
.section-sub {
  color: var(--muted);
  font-size: 16px;
  margin: 0 0 40px;
  max-width: 780px;
}
.alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

/* ===== FEATURE BANDS (alternating) ===== */
.band {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.band.reverse .band-text { order: 2; }
.band-text h3 {
  font-size: 24px;
  color: var(--c1);
  margin: 0 0 14px;
}
.band-text p { margin: 0 0 14px; color: var(--muted); }
.band-list { list-style: none; padding: 0; margin: 18px 0 0; }
.band-list li {
  padding: 10px 0 10px 30px;
  position: relative;
  border-bottom: 1px dashed var(--line);
  color: var(--ink);
}
.band-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c1), var(--c2));
}
.band-visual {
  background: linear-gradient(160deg, var(--accent), #ffffff);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 36px;
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c1);
}

/* ===== GRIDS ===== */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px 26px;
  transition: box-shadow 0.2s, transform 0.15s;
}
.card:hover { box-shadow: 0 14px 34px rgba(11, 79, 140, 0.10); transform: translateY(-2px); }
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.card h3 {
  font-size: 18px;
  margin: 0 0 10px;
  color: var(--ink);
}
.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* Download quick grid */
.dl-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.dl-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 30px 24px;
  text-align: center;
}
.dl-card .dl-ico {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 14px;
  background: var(--accent);
  color: var(--c1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.dl-card h4 { margin: 0 0 6px; color: var(--c1); font-size: 18px; }
.dl-card p { margin: 0 0 18px; color: var(--muted); font-size: 14px; }
.dl-card button { width: 100%; }

/* Stats strip */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  text-align: center;
}
.stat b { display: block; font-size: 36px; color: var(--c2); font-weight: 700; margin-bottom: 6px; }
.stat span { color: var(--muted); font-size: 15px; }

/* Reviews */
.review {
  background: #fff;
  border-left: 4px solid var(--c2);
  padding: 26px 26px 22px;
  border-radius: 10px;
  box-shadow: 0 4px 18px rgba(11, 79, 140, 0.05);
}
.review p { margin: 0 0 14px; color: var(--ink); }
.review .who { color: var(--c1); font-weight: 600; font-size: 14px; }
.review .role { color: var(--muted); font-size: 13px; }

/* Compare table */
.compare {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.compare th, .compare td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.compare th { background: var(--c1); color: #fff; font-weight: 600; }
.compare tr:last-child td { border-bottom: none; }
.compare tr:nth-child(even) td { background: #F7FAFD; }

/* FAQ */
.faq {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 26px;
  margin-bottom: 14px;
}
.faq h4 {
  margin: 0 0 10px;
  color: var(--c1);
  font-size: 17px;
  display: flex;
  gap: 10px;
  align-items: baseline;
}
.faq h4::before {
  content: "Q";
  color: #fff;
  background: var(--c2);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
}
.faq p { margin: 0; color: var(--muted); }

/* Step list */
.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.steps li {
  position: relative;
  padding: 20px 24px 20px 78px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  margin-bottom: 14px;
  counter-increment: step;
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 22px;
  top: 20px;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  color: #fff;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.steps h4 { margin: 0 0 6px; color: var(--c1); font-size: 17px; }
.steps p { margin: 0; color: var(--muted); }

/* Requirement table */
.req { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); }
.req th, .req td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--line); }
.req th { background: var(--accent); color: var(--c1); }
.req tr:last-child td { border-bottom: none; }

/* Changelog */
.log { list-style: none; padding: 0; margin: 0; }
.log li {
  background: #fff;
  border-left: 3px solid var(--c2);
  border-radius: 8px;
  padding: 18px 22px;
  margin-bottom: 12px;
  box-shadow: 0 2px 10px rgba(11, 79, 140, 0.04);
}
.log .ver { color: var(--c1); font-weight: 700; margin-right: 12px; }
.log .date { color: var(--muted); font-size: 13px; }

/* Article */
.article-body h2 { color: var(--c1); font-size: 26px; margin: 40px 0 14px; }
.article-body h3 { color: var(--c2); font-size: 20px; margin: 28px 0 10px; }
.article-body p { margin: 0 0 16px; color: var(--ink); }
.article-body .cta-inline {
  background: linear-gradient(135deg, var(--accent), #fff);
  border: 1px solid var(--line);
  border-left: 5px solid var(--c2);
  padding: 20px 24px;
  border-radius: 10px;
  margin: 26px 0;
}
.article-body .cta-inline p { margin: 0 0 12px; }

/* Callout / CTA band */
.cta-band {
  background: linear-gradient(135deg, var(--c1), var(--c2));
  color: #fff;
  padding: 60px 24px;
  text-align: center;
}
.cta-band h2 { margin: 0 0 12px; font-size: 28px; color: #fff; }
.cta-band p { margin: 0 auto 26px; max-width: 720px; color: rgba(255,255,255,0.9); }

/* Footer */
footer.site-foot {
  background: #0A2540;
  color: #B9C7D8;
  padding: 50px 24px 26px;
  font-size: 14px;
}
.foot-inner { max-width: 1120px; margin: 0 auto; }
.foot-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 30px; margin-bottom: 30px; }
.foot-grid h5 { color: #fff; margin: 0 0 12px; font-size: 15px; }
.foot-grid ul { list-style: none; padding: 0; margin: 0; }
.foot-grid li { margin-bottom: 8px; }
.foot-grid a { color: #B9C7D8; }
.foot-grid a:hover { color: #fff; }
.foot-note {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px;
  color: #8FA0B5;
  line-height: 1.8;
}

/* Responsive */
@media (max-width: 900px) {
  .hero { padding: 60px 20px 70px; }
  .hero h1 { font-size: 32px; }
  .band { grid-template-columns: 1fr; gap: 30px; }
  .band.reverse .band-text { order: 0; }
  .grid-3, .grid-4, .dl-grid, .stats { grid-template-columns: 1fr 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .mainnav a { padding: 6px 12px; font-size: 14px; }
  .brand { font-size: 17px; }
}
@media (max-width: 560px) {
  .grid-3, .grid-4, .dl-grid, .stats, .foot-grid { grid-template-columns: 1fr; }
  .section { padding: 56px 20px; }
  .hero h1 { font-size: 26px; }
  .topbar-inner { flex-direction: column; gap: 12px; padding: 12px 16px; }
}