:root {
  --blue: #0077be;
  --blue-deep: #005a8c;
  --ink: #17212b;
  --muted: #5c6b7a;
  --line: #e4ebf0;
  --paper: #f4f8fb;
  --white: #fff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

a { color: inherit; }

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
}

.top nav {
  display: flex;
  gap: 20px;
}

.top nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
}

.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 48px 24px 28px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--blue);
  font-weight: 700;
  letter-spacing: 0.12em;
}

h1 {
  margin: 0;
  font-size: clamp(36px, 6vw, 56px);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.lead {
  max-width: 38em;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.actions, .cards {
  display: grid;
  gap: 14px;
}

.actions {
  grid-template-columns: repeat(3, minmax(0, 220px));
  margin-top: 32px;
}

.btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 72px;
  padding: 12px 16px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid transparent;
}

.btn-kicker {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  opacity: 0.8;
}

.btn.primary {
  background: var(--blue);
  color: var(--white);
}

.btn.primary:hover { background: var(--blue-deep); }

.btn.ghost {
  background: var(--white);
  border-color: var(--line);
}

.btn.ghost:hover { border-color: var(--blue); color: var(--blue-deep); }

.panel {
  max-width: 1080px;
  margin: 0 auto;
  padding: 12px 24px 36px;
}

h2 {
  margin: 0 0 16px;
  font-size: 28px;
}

.features, .cards {
  margin: 0;
  padding: 0;
  list-style: none;
}

.features {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.features li, .card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
}

.features h3, .card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.features p, .card p, .note {
  margin: 0;
  color: var(--muted);
}

.cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card .btn { margin-top: auto; }

.note {
  margin-top: 16px;
  font-size: 14px;
}

.spec-lead { margin-top: 0; margin-bottom: 16px; }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--white);
}

.spec {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.spec th,
.spec td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.spec thead th {
  background: #e8f3fa;
  font-size: 14px;
}

.spec tbody th {
  width: 7.5em;
  font-weight: 700;
  white-space: nowrap;
}

.spec tr:last-child th,
.spec tr:last-child td { border-bottom: 0; }

code {
  font-family: Consolas, "Courier New", monospace;
  background: #e7eef3;
  padding: 1px 6px;
  border-radius: 6px;
}

footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 8px 24px 32px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 860px) {
  .actions, .features, .cards { grid-template-columns: 1fr; }
  .actions { max-width: 420px; }
}