.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
@media (max-width: 768px) { .contact-grid { grid-template-columns: 1fr; } }
.address-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 32px; }
.address-card {
  padding: 24px;
  background: var(--color-bg-dark-2);
  color: var(--color-text-on-dark);
  border-radius: var(--radius-md);
  border: 1px solid rgba(37,99,235,0.2);
}
.address-card h3 { color: var(--color-accent); margin-bottom: 8px; }

/* ── 联系我们 / demo 页 ── */
.demo-hero {
  position: relative;
  padding: 44px 0 64px;
  background:
    radial-gradient(ellipse 70% 55% at 75% 35%, rgba(37, 99, 235, 0.28) 0%, transparent 58%),
    radial-gradient(ellipse 45% 35% at 12% 75%, rgba(6, 182, 212, 0.14) 0%, transparent 52%),
    linear-gradient(180deg, #030712 0%, #0a1628 50%, #061018 100%);
  overflow: hidden;
}

.demo-hero__grid-lines {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(56, 189, 248, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 85% 75% at 50% 40%, #000 20%, transparent 75%);
  pointer-events: none;
}

.demo-hero__glow {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(80px);
}

.demo-hero__glow--primary {
  width: 380px;
  height: 380px;
  top: -60px;
  right: 10%;
  background: rgba(37, 99, 235, 0.22);
}

.demo-hero__glow--secondary {
  width: 240px;
  height: 240px;
  top: 35%;
  left: 6%;
  background: rgba(6, 182, 212, 0.12);
}

.demo-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
}

.demo-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 8px 16px 8px 12px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(186, 230, 253, 0.95);
  background: rgba(37, 99, 235, 0.15);
  border: 1px solid rgba(96, 165, 250, 0.35);
  border-radius: 999px;
}

.demo-hero__badge::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22d3ee;
  box-shadow: 0 0 12px #22d3ee;
}

.demo-hero h1 {
  font-size: clamp(1.75rem, 3.5vw, 2.375rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #f8fafc;
  margin-bottom: 14px;
}

.demo-hero__desc {
  max-width: 560px;
  margin: 0 auto 28px;
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(148, 163, 184, 0.95);
}

.demo-hero__features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.demo-hero__feature {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px 16px 18px;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-md);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.demo-hero__feature:hover {
  border-color: rgba(34, 211, 238, 0.4);
  box-shadow: 0 8px 28px rgba(37, 99, 235, 0.15);
  transform: translateY(-2px);
}

.demo-hero__feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: rgba(37, 99, 235, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.22);
}

.demo-hero__feature-icon img {
  width: 28px;
  height: 28px;
  margin: 0;
}

.demo-hero__feature-text {
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.45;
  color: rgba(226, 232, 240, 0.95);
  text-align: center;
}

.page-demo .section--demo {
  padding: 36px 0 56px;
  background: var(--color-bg-subtle);
}

.demo-form-wrap {
  max-width: 840px;
  margin: 0 auto;
}

.demo-form {
  padding: 28px 32px 24px;
  background: #fff;
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: calc(var(--radius-lg) + 2px);
  box-shadow: 0 4px 24px rgba(15, 23, 42, 0.06);
}

.demo-form__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 20px;
}

.demo-form .form-group {
  margin-bottom: 0;
}

.demo-form .form-group--full {
  grid-column: 1 / -1;
}

.demo-form__desc {
  margin-top: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.page-demo .demo-form label {
  margin-bottom: 6px;
  font-size: 0.8125rem;
}

.page-demo .demo-form .form-input {
  padding: 11px 14px;
  font-size: 0.9375rem;
}

.page-demo .demo-form textarea.form-input {
  min-height: 72px;
  resize: vertical;
}

.demo-form__submit {
  width: 100%;
  margin-top: 16px;
  padding: 11px 24px;
}

@media (max-width: 992px) {
  .demo-hero {
    padding: 36px 0 52px;
  }

  .demo-hero__features {
    grid-template-columns: 1fr;
    max-width: 360px;
    margin: 0 auto;
  }

  .demo-hero__feature {
    flex-direction: row;
    align-items: center;
    padding: 14px 16px;
    text-align: left;
  }

  .demo-hero__feature-icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
  }

  .demo-hero__feature-text {
    text-align: left;
  }

  .page-demo .section--demo {
    padding: 28px 0 48px;
  }
}

@media (max-width: 576px) {
  .demo-hero h1 {
    font-size: 1.5rem;
  }

  .demo-hero__desc {
    font-size: 0.9375rem;
    margin-bottom: 22px;
  }

  .demo-form {
    padding: 20px 16px 18px;
  }

  .demo-form__grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}