:root {
  --bg: #f4f7fb;
  --ink: #11243a;
  --muted: #4f6278;
  --card: #ffffff;
  --line: #dbe5ef;
  --accent: #0f6dff;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif; color: var(--ink); background: linear-gradient(180deg, #f7fbff 0%, #eef4fa 100%); }
.wrap { width: min(1100px, 92%); margin: 0 auto; }
header { padding: 24px 0; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.85); }
.brand { font-weight: 700; }
nav a { margin-left: 18px; color: var(--muted); text-decoration: none; }
.hero { padding: 56px 0 36px; }
.hero h1 { font-size: 36px; margin: 0 0 12px; }
.hero p { color: var(--muted); font-size: 18px; max-width: 760px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 24px 0 48px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card h3 { margin: 0 0 8px; }
.card p { margin: 0; color: var(--muted); line-height: 1.6; }
footer { margin-top: 24px; border-top: 1px solid var(--line); padding: 18px 0 26px; color: var(--muted); font-size: 14px; }
@media (max-width: 880px) { .hero h1 { font-size: 28px; } .grid { grid-template-columns: 1fr; } }