:root {
  --bg0: #f3f6fb;
  --bg1: #eef2f8;
  --ink: #1f2937;
  --muted: #6b7280;
  --white: #ffffff;
  --blue: #3b82f6;
  --blue-deep: #2563eb;
  --purple: #8b5cf6;
  --purple-deep: #7c3aed;
  --red: #ef4444;
  --red-deep: #dc2626;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 50% -10%, #dde7ff 0%, transparent 60%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
}

.home {
  max-width: 1200px;
  margin: 0 auto;
  padding: 72px 24px 80px;
}

.home-hero {
  text-align: center;
  margin-bottom: 48px;
}
.home-hero h1 {
  margin: 0;
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.25;
}
.home-hero h1 span {
  background: linear-gradient(90deg, #7c3aed, #3b82f6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.home-hero p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 420px;
  border: 1px solid rgba(15, 23, 42, 0.04);
}

.card-head {
  padding: 28px 24px 26px;
  color: #fff;
}
.card-head h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.35;
}
.card-head p {
  margin: 10px 0 0;
  opacity: 0.92;
  font-size: 14px;
}

.card-blue .card-head { background: linear-gradient(135deg, #60a5fa, var(--blue-deep)); }
.card-purple .card-head { background: linear-gradient(135deg, #a78bfa, var(--purple-deep)); }
.card-red .card-head { background: linear-gradient(135deg, #f87171, var(--red-deep)); }

.card-body {
  padding: 22px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.card-body h3 {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 700;
}
.card-blue .card-body h3 { color: var(--blue-deep); }
.card-purple .card-body h3 { color: var(--purple-deep); }
.card-red .card-body h3 { color: var(--red-deep); }

.card-body ul {
  margin: 0;
  padding-left: 18px;
  color: #374151;
  line-height: 1.8;
  font-size: 14px;
}
.support {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.card-btn {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  align-self: flex-start;
  min-width: 148px;
  padding: 11px 18px;
  border-radius: 999px;
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
  transition: transform 0.15s ease, filter 0.15s ease;
}
.card-btn:hover { transform: translateY(-1px); filter: brightness(1.05); }

.card-blue .card-btn { background: linear-gradient(90deg, #60a5fa, var(--blue-deep)); }
.card-purple .card-btn {
  background: linear-gradient(90deg, #a78bfa, var(--purple-deep));
  box-shadow: 0 6px 16px rgba(124, 58, 237, 0.25);
}
.card-red .card-btn {
  background: linear-gradient(90deg, #f87171, var(--red-deep));
  box-shadow: 0 6px 16px rgba(220, 38, 38, 0.25);
}

@media (max-width: 960px) {
  .cards { grid-template-columns: 1fr; }
  .home { padding-top: 48px; }
  .card { min-height: auto; }
}