:root {
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --ink: #0f172a;
  --muted: #64748b;
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e2e8f0;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
header.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.85); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav .container { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--ink); }
.brand svg { width: 28px; height: 28px; }
.nav nav { display: flex; gap: 22px; font-size: 14px; }
.nav nav a { color: var(--muted); }
.nav nav a:hover { color: var(--ink); text-decoration: none; }

.hero { padding: 72px 0 56px; text-align: center; }
.hero .badge {
  display: inline-block; font-size: 13px; color: var(--blue);
  background: #eff6ff; border: 1px solid #dbeafe; border-radius: 999px;
  padding: 4px 14px; margin-bottom: 18px;
}
.hero h1 { font-size: 44px; line-height: 1.15; margin: 0 0 14px; letter-spacing: -.5px; }
.hero p.sub { font-size: 18px; color: var(--muted); max-width: 720px; margin: 0 auto 28px; }
.btn {
  display: inline-block; padding: 12px 26px; border-radius: 10px; font-weight: 600;
  font-size: 15px; cursor: pointer; border: 1px solid transparent; transition: .15s;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); text-decoration: none; }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); text-decoration: none; }
.hero .cta { display: flex; gap: 12px; justify-content: center; }

section.block { padding: 48px 0; }
.section-title { text-align: center; font-size: 28px; margin: 0 0 8px; }
.section-desc { text-align: center; color: var(--muted); margin: 0 auto 36px; max-width: 680px; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 22px; transition: .15s;
}
.card:hover { box-shadow: 0 8px 24px rgba(15,23,42,.06); transform: translateY(-2px); }
.card .ic {
  width: 40px; height: 40px; border-radius: 10px; background: #eff6ff; color: var(--blue);
  display: flex; align-items: center; justify-content: center; margin-bottom: 14px;
}
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

.download { background: #fff; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.platforms { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.platform {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 22px;
  text-align: left; transition: .15s;
}
.platform:hover { box-shadow: 0 8px 24px rgba(15,23,42,.06); transform: translateY(-2px); border-color: #c7d7f5; }
.platform .os { display: flex; align-items: center; gap: 8px; font-size: 16px; font-weight: 700;
  margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.platform .os-ic { font-size: 18px; line-height: 1; }
.pf { display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 12px 0; border-bottom: 1px dashed var(--border); }
.pf:last-child { border-bottom: none; }
.pf-info { min-width: 0; }
.pf-name { display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-size: 14px; font-weight: 600; color: var(--ink); word-break: break-all; }
.pf-meta { display: flex; align-items: center; gap: 6px; margin-top: 5px; font-size: 12px; color: var(--muted); }
.pf-meta .dot { opacity: .5; }
.pf-empty { color: var(--muted); font-size: 13px; padding: 8px 0; margin: 0; }
.platform .new-tag { display: inline-block; font-size: 11px; font-weight: 700;
  color: #16a34a; background: #ecfdf5; border: 1px solid #bbf7d0; border-radius: 999px; padding: 1px 8px; }
.platform .dl { flex: 0 0 auto; white-space: nowrap; padding: 9px 18px; font-size: 14px; }
.dl-note { text-align: center; color: var(--muted); font-size: 13px; margin-top: 20px; }
.readme {
  max-width: 860px; margin: 28px auto 0; background: #fff; border: 1px solid var(--border);
  border-radius: 12px; padding: 22px 26px; font-size: 14px; color: #334155; line-height: 1.7;
}
.readme .rk-h { margin: 18px 0 8px; color: var(--ink); line-height: 1.3; }
.readme .rk-h:first-child { margin-top: 0; }
.readme p { margin: 8px 0; }
.readme ul, .readme ol { margin: 8px 0; padding-left: 22px; }
.readme li { margin: 5px 0; }
.readme blockquote {
  margin: 12px 0; padding: 10px 14px; border-left: 3px solid #bfdbfe;
  background: #eff6ff; border-radius: 6px; color: #475569;
}
.readme blockquote p { margin: 2px 0; }
.readme pre {
  margin: 12px 0; padding: 12px 14px; background: #0f172a; border-radius: 8px; overflow-x: auto;
}
.readme pre code { color: #e2e8f0; font-size: 12px; white-space: pre; }
.readme code {
  background: #eef2f7; padding: 1px 6px; border-radius: 4px;
  font-size: 12px; color: #be185d; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.readme strong { font-weight: 700; color: var(--ink); }
.readme img.rk-img {
  display: block; max-width: 100%; height: auto; margin: 14px auto 4px;
  border: 1px solid var(--border); border-radius: 10px; background: #fff;
}
#dl-loading { text-align: center; color: var(--muted); padding: 24px; }

footer.site {
  padding: 32px 0; text-align: center; color: var(--muted); font-size: 13px;
  border-top: 1px solid var(--border);
}
footer.site .links { margin-top: 8px; }
footer.site .links a { color: var(--muted); margin: 0 8px; }
footer.site .console-link { font-size: 12px; opacity: .7; }

/* ===== 富化落地页：海报融合区块 ===== */

/* hero 多徽章 */
.hero .badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 22px; }
.badge.warm { background: #fff7ed; color: #d97706; border-color: #fdba74; }

/* 痛点 */
.pain-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.pain { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px 18px; text-align: left; }
.pain .ico { width: 40px; height: 40px; border-radius: 10px; background: #fef2f2; color: #dc2626;
  display: flex; align-items: center; justify-content: center; font-size: 18px; margin-bottom: 12px; }
.pain h3 { margin: 0 0 8px; font-size: 16px; color: #dc2626; }
.pain p { margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.7; }
.pain-sum { margin-top: 18px; background: #fff7f7; border: 1px dashed #fca5a5; border-radius: 10px;
  padding: 14px 18px; font-size: 14px; color: #b91c1c; font-weight: 600; text-align: left; }

/* 工作原理 */
.how { display: grid; grid-template-columns: 1fr 56px 1fr; align-items: stretch; gap: 0; }
.how-card { border-radius: 16px; padding: 26px 28px; color: #fff; text-align: left; }
.how-card.dark { background: linear-gradient(135deg, #0f172a, #1e3a8a); }
.how-card.blue { background: linear-gradient(135deg, #2563eb, #3b82f6); }
.how-card .step { font-size: 12px; letter-spacing: 1px; font-weight: 700; opacity: .85; }
.how-card h3 { margin: 6px 0 4px; font-size: 22px; font-weight: 900; }
.how-card .chip { display: inline-block; background: rgba(255,255,255,.16); border-radius: 999px;
  padding: 5px 14px; font-size: 12px; margin: 8px 0 14px; }
.how-card ul { list-style: none; padding: 0; margin: 0; }
.how-card li { font-size: 13.5px; line-height: 2; padding-left: 16px; position: relative; opacity: .95; }
.how-card li::before { content: "•"; position: absolute; left: 0; }
.how-mid { display: flex; align-items: center; justify-content: center; font-size: 24px; color: var(--blue); font-weight: 900; }
.arch-strip { margin-top: 18px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.arch-node { background: #eef4ff; border: 1px solid #dbeafe; border-radius: 10px; padding: 12px; text-align: center; }
.arch-node b { display: block; font-size: 14px; color: var(--blue); }
.arch-node span { font-size: 11.5px; color: var(--muted); }

/* 基座能力（编号 + 卖点） */
.card.cap-top { border-top: 4px solid var(--blue); }
.card .num { font-size: 13px; font-weight: 900; color: #93b4f5; }
.card .sell { display: inline-block; margin-top: 12px; font-size: 12.5px; font-weight: 700;
  color: var(--blue); background: #eff6ff; border-radius: 8px; padding: 6px 10px; }

/* 四大基座能力：始终一排 4 列 */
.grid.cap-grid { grid-template-columns: repeat(4, 1fr); }

/* 三种算力姿态 */
.mode-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.mode { border-radius: 14px; padding: 22px; color: #fff; text-align: left; }
.mode.m1 { background: linear-gradient(135deg, #1d4ed8, #3b82f6); }
.mode.m2 { background: linear-gradient(135deg, #0e7490, #06b6d4); }
.mode.m3 { background: linear-gradient(135deg, #0f172a, #334e9e); }
.mode .tag { font-size: 11.5px; letter-spacing: 1px; font-weight: 700; opacity: .85; }
.mode h3 { margin: 6px 0 10px; font-size: 19px; font-weight: 900; }
.mode p { margin: 0; font-size: 13.5px; line-height: 1.7; opacity: .95; }
.mode-quote { margin-top: 22px; text-align: center; font-size: 15px; font-weight: 800; color: var(--blue); }

/* 为什么选择蓝擎 */
.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.why { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px 18px;
  display: flex; flex-direction: column; text-align: left; }
.why .ico { font-size: 24px; margin-bottom: 10px; }
.why h3 { margin: 0 0 8px; font-size: 15.5px; }
.why p { margin: 0; font-size: 12.5px; color: var(--muted); line-height: 1.7; }
.why .vs { margin-top: auto; padding-top: 10px; border-top: 1px dashed var(--border); }
.why .vs b { font-size: 11.5px; color: var(--blue); font-weight: 800; display: block; margin-bottom: 3px; }
.why .vs span { font-size: 11.5px; color: #94a3b8; line-height: 1.55; }
.why .vs.trad b { color: #94a3b8; }

/* 部署与合规：复用 .grid/.card，绿色图标 */
.dep .ic { background: #ecfdf5; color: #16a34a; }

@media (max-width: 820px) {
  .grid, .platforms { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
  .nav nav { display: none; }
  .pain-grid, .arch-strip, .why-grid { grid-template-columns: repeat(2, 1fr); }
  .grid.cap-grid { grid-template-columns: repeat(2, 1fr); }
  .how { grid-template-columns: 1fr; }
  .how-mid { padding: 6px 0; }
  .mode-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .pain-grid, .arch-strip, .why-grid { grid-template-columns: 1fr; }
  .grid.cap-grid { grid-template-columns: 1fr; }
}