:root {
  --ink: #15231d;
  --muted: #5f7068;
  --paper: #f5f1e8;
  --panel: #fffaf0;
  --line: rgba(21, 35, 29, 0.16);
  --accent: #1f7a4f;
  --accent-dark: #15513a;
  --amber: #d5952d;
  --shadow: 0 24px 70px rgba(25, 42, 34, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 12% 18%, rgba(213, 149, 45, 0.22), transparent 28rem),
    radial-gradient(circle at 88% 12%, rgba(31, 122, 79, 0.16), transparent 26rem),
    linear-gradient(135deg, #f8f4eb 0%, #e9efe5 100%);
}

.page-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(42px, 7vw, 86px);
  border: 1px solid var(--line);
  border-radius: 36px;
  background: rgba(255, 250, 240, 0.82);
  box-shadow: var(--shadow);
}

.hero::after {
  content: "QC";
  position: absolute;
  right: -12px;
  bottom: -68px;
  color: rgba(31, 122, 79, 0.09);
  font-size: clamp(150px, 28vw, 320px);
  font-weight: 900;
  letter-spacing: -0.12em;
  pointer-events: none;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(3.2rem, 8vw, 7.8rem);
  line-height: 0.9;
  letter-spacing: -0.08em;
}

.lead {
  max-width: 660px;
  color: var(--muted);
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  line-height: 1.9;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
}

.button.primary {
  color: #fff;
  background: var(--accent);
}

.button.secondary {
  color: var(--accent-dark);
  border: 1px solid rgba(21, 81, 58, 0.32);
  background: rgba(255, 255, 255, 0.42);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.card {
  min-height: 250px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 250, 240, 0.76);
}

.card-index {
  display: inline-flex;
  margin-bottom: 42px;
  color: var(--amber);
  font-weight: 900;
  letter-spacing: 0.12em;
}

.card h2 {
  margin-bottom: 12px;
  font-size: 1.35rem;
}

.card p,
.roadmap li {
  color: var(--muted);
  line-height: 1.75;
}

.roadmap {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 32px;
  margin-top: 22px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: rgba(21, 35, 29, 0.88);
  color: #fffaf0;
}

.roadmap .eyebrow,
.roadmap li {
  color: rgba(255, 250, 240, 0.76);
}

.roadmap ul {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 20px;
}

@media (max-width: 860px) {
  .tool-grid,
  .roadmap {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .page-shell {
    width: min(100% - 24px, 1120px);
    padding: 24px 0;
  }

  .hero,
  .card,
  .roadmap {
    border-radius: 24px;
  }
}