/* ===== Base ===== */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #05070d;
  color: #e5e7eb;
}

h1, h2, h3 {
  margin: 0;
  font-weight: 600;
}

p {
  margin: 0;
  opacity: 0.9;
}

/* ===== Sections ===== */
.section {
  padding: 64px 20px;
  text-align: center;
}

.section.dark {
  background: #0b0f19;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 88vh; /* PC 更紧凑 */
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, #1e3a8a, transparent 40%),
    radial-gradient(circle at 80% 30%, #0ea5e9, transparent 40%),
    #020617;
  filter: blur(36px);
}

.hero-content {
  position: relative;
  max-width: 920px;
  margin: auto;
  padding: 120px 20px 0;
}

.hero h1 {
  font-size: 3.1rem;
  line-height: 1.15;
}

.hero h1 span {
  color: #38bdf8;
}

.hero-subtitle {
  margin-top: 18px;
  font-size: 1.15rem;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.hero-note {
  margin-top: 10px;
  font-size: 0.82rem;
  opacity: 0.6;
}

/* ===== CTA ===== */
.cta-primary,
.cta-secondary {
  display: inline-block;
  margin-top: 26px;
  padding: 14px 34px;
  border-radius: 10px;
  font-weight: 600;
  text-decoration: none;
}

.cta-primary {
  background: linear-gradient(90deg, #22d3ee, #38bdf8);
  color: #020617;
}

.cta-secondary {
  background: #25d366;
  color: #020617;
}

/* ===== Grids ===== */
.grid-3,
.grid-2 {
  display: grid;
  gap: 22px;
  margin-top: 40px;
}

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

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

.card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  padding: 26px;
  border-radius: 14px;
}

/* ===== AI Terminal ===== */
.terminal {
  max-width: 680px;
  margin: 30px auto 0;
  background: #020617;
  border: 1px solid #1e293b;
  padding: 18px;
  border-radius: 12px;
  text-align: left;
  font-family: monospace;
  color: #22d3ee;
  font-size: 0.92rem;
}

/* ===== Steps ===== */
.steps {
  max-width: 520px;
  margin: 30px auto 0;
  text-align: left;
}

.steps li {
  margin: 14px 0;
}

/* ===== Disclaimer ===== */
.disclaimer {
  font-size: 0.82rem;
  color: #94a3b8;
  line-height: 1.5;
}

/* ===== Footer ===== */
.footer {
  background: #020617;
  padding: 24px;
  text-align: center;
  font-size: 0.78rem;
}

/* ===================== */
/* 📱 Mobile Optimization */
/* ===================== */
@media (max-width: 768px) {

  .hero {
    min-height: auto;
  }

  .hero-content {
    padding-top: 88px;
  }

  .hero h1 {
    font-size: 2.15rem;
  }

  .hero-subtitle {
    font-size: 1rem;
    margin-top: 14px;
  }

  .cta-primary,
  .cta-secondary {
    width: 100%;
    padding: 14px 0;
    font-size: 1rem;
  }

  .section {
    padding: 48px 16px;
  }

  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
    margin-top: 30px;
  }

  .card {
    padding: 22px;
  }

  .terminal {
    font-size: 0.85rem;
  }
}