/* ---------------- 功能区 ---------------- */
.features {
  padding: 30px 0 90px;
}
.sec-head {
  text-align: center;
  margin-bottom: 40px;
}
.sec-head h2 {
  font-size: clamp(24px, 3vw, 34px);
  margin: 0;
  letter-spacing: -0.3px;
}
.sec-head p {
  color: var(--muted);
  margin: 12px 0 0;
  font-size: 15px;
}
.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.card {
  padding: 24px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, oklch(0.225 0.012 250 / 80%), oklch(0.2 0.011 250 / 80%));
  border: 1px solid var(--border);
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 620ms var(--ease),
    transform 620ms var(--ease),
    border-color 220ms var(--ease);
}
.card.in {
  opacity: 1;
  transform: translateY(0);
}
.card:hover {
  border-color: oklch(0.72 0.105 184 / 45%);
}
.card .ci {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  color: var(--primary-strong);
  background: oklch(0.72 0.105 184 / 12%);
  border: 1px solid oklch(0.72 0.105 184 / 24%);
}
.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}
.card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------------- 页脚 ---------------- */
footer {
  border-top: 1px solid var(--border-soft);
  padding: 26px 0;
}
.foot-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 940px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 34px;
    min-height: auto;
    padding-top: 30px;
    text-align: center;
  }
  .hero .copy {
    order: 1;
  }
  .hero .visual {
    order: 2;
  }
  .eyebrow,
  .cta,
  .stats {
    justify-content: center;
  }
  .sub {
    margin-inline: auto;
  }
  .nav-links a:not(.btn) {
    display: none;
  }
  .demo-step .dlabel {
    font-size: 12px;
  }
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 560px) {
  .device {
    aspect-ratio: 16 / 13;
  }
  .demo-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .ed-rail {
    width: 88px;
    padding-inline: 6px;
  }
  .ed-return {
    padding-inline: 7px;
  }
  .ed-title {
    font-size: 9.5px;
  }
  .ed-top {
    padding-inline: 7px;
    gap: 4px;
  }
  .ed-tool {
    padding-inline: 7px;
    gap: 4px;
  }
  .ed-ai {
    width: 104px;
    padding-inline: 7px;
  }
  .ed-ai-msg.user {
    margin-left: 6px;
  }
  .ed-slide {
    width: 90%;
    padding: 16px;
  }
  .ed-slide .pic {
    width: 30%;
  }
  .cards {
    grid-template-columns: 1fr;
  }
  .stats {
    gap: 22px;
  }
}

/* ---------------- 减少动效 ---------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  .caret,
  .eyebrow .dot {
    animation: none !important;
    transition: none !important;
  }
  .card {
    opacity: 1;
    transform: none;
  }
  .screen {
    transition: opacity 0.2s linear !important;
  }
}