:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --text: #17202a;
  --muted: #667085;
  --line: #d7dee8;
  --blue: #2563eb;
  --green: #0f8b63;
  --ink: #101828;
  --shadow: 0 18px 45px rgba(36, 48, 71, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.case-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 34px 0 52px;
}

.case-hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 28px;
  border-radius: 12px;
  color: #fff;
  background: #123c69;
  box-shadow: var(--shadow);
}

.case-hero h1 {
  margin: 0;
  font-size: 38px;
  line-height: 1.1;
  letter-spacing: 0;
}

.case-hero p {
  max-width: 760px;
  margin: 12px 0 0;
  color: #dce8f5;
  font-size: 16px;
  line-height: 1.7;
}

.eyebrow {
  margin: 0 0 7px;
  color: #2f6feb;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

.case-hero .eyebrow {
  color: #9fe5c4;
}

.back-link {
  flex: none;
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  color: #fff;
  text-decoration: none;
  font-size: 13px;
  font-weight: 850;
}

.summary-grid,
.flow-grid,
.two-column {
  display: grid;
  gap: 16px;
}

.summary-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 18px 0;
}

.summary-grid article,
.panel {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: 0 10px 28px rgba(36, 48, 71, 0.08);
}

.summary-grid article {
  padding: 18px;
}

.summary-grid span,
.summary-grid strong {
  display: block;
}

.summary-grid span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 850;
}

.summary-grid strong {
  margin-top: 7px;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.35;
}

.summary-grid p,
.flow-grid p,
.check-list,
.plain-list,
.talk-track {
  color: #475467;
  line-height: 1.65;
}

.summary-grid p {
  margin: 10px 0 0;
  font-size: 14px;
}

.panel {
  margin-top: 16px;
  padding: 20px;
}

.panel-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: 24px;
  letter-spacing: 0;
}

.architecture {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1.1fr auto 1fr;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}

.arch-node,
.arch-stack div {
  min-height: 94px;
  display: grid;
  place-items: center;
  padding: 14px;
  border: 1px solid #dbe7ff;
  border-radius: 10px;
  background: #eef4ff;
  color: var(--ink);
  text-align: center;
  font-weight: 850;
  line-height: 1.45;
}

.arch-node small {
  color: var(--muted);
  font-weight: 700;
}

.arch-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.arch-stack div {
  min-height: 43px;
  background: #f4fff9;
  border-color: #cdeedf;
  color: #07593f;
}

.arch-arrow {
  color: var(--blue);
  font-size: 24px;
  font-weight: 900;
}

.flow-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.flow-grid article {
  min-height: 150px;
  padding: 16px;
  border: 1px solid #e6edf6;
  border-radius: 8px;
  background: #fbfcfd;
}

.flow-grid b {
  color: var(--ink);
}

.flow-grid p {
  margin: 9px 0 0;
  font-size: 14px;
}

.two-column {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.check-list,
.plain-list,
.talk-track {
  margin: 16px 0 0;
  padding-left: 22px;
}

.check-list li,
.plain-list li,
.talk-track li {
  margin: 10px 0;
}

.source-list {
  display: grid;
  gap: 9px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.source-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  background: #fbfcfd;
  border: 1px solid #e6edf6;
}

.source-list span {
  color: var(--blue);
  font-weight: 850;
}

.source-list b {
  color: #344054;
  text-align: right;
  font-size: 14px;
}

.case-actions,.case-footer{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.primary-link{display:inline-flex;padding:10px 14px;border-radius:8px;background:var(--blue);color:#fff;text-decoration:none;font-weight:800}.product-preview>p{color:#667085}.product-preview iframe{width:100%;height:560px;margin-top:12px;border:1px solid #dfe7f1;border-radius:12px;background:#fff}.case-footer{margin-top:20px;padding:22px;border-radius:12px;background:#eef5ff}.case-footer>div{display:grid;gap:4px;margin-right:auto}.case-footer span{color:#667085;font-size:13px}

@media (max-width: 860px) {
  .case-shell {
    width: min(100% - 24px, 720px);
    padding: 18px 0 34px;
  }

  .case-hero,
  .source-list li {
    flex-direction: column;
  }

  .case-hero h1 {
    font-size: 30px;
  }

  .summary-grid,
  .flow-grid,
  .two-column,
  .architecture {
    grid-template-columns: 1fr;
  }

  .arch-arrow {
    display: none;
  }

  .source-list b {
    text-align: left;
  }

  .product-preview iframe{height:520px}.case-actions,.case-footer{align-items:stretch;flex-direction:column}.case-actions a,.case-footer a{text-align:center;justify-content:center}
}