/* ============================================
   System Demo Section — 笔记本电脑轮播
   外层白卡 + 浅蓝舞台 + 5 台 MacBook 风电脑 swiper
   ============================================ */

#section-system.home-section {
  position: relative;
  width: 100%;
  padding: clamp(80px, 8vw, 160px) 0;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

.system-demo__inner {
  /* PC：占父级 ~90%，大屏封顶 1680px
     min-width: 0 防止 grid item 被内容撑大（section 是 display:grid） */
  width: 90%;
  min-width: 0;
  max-width: 1680px;
  margin: 0 auto;
  padding: 0;
  box-sizing: border-box;
}

/* ---- 外层大白卡 ---- */
.system-demo__card {
  position: relative;
  width: 100%;
  background: #FFFFFF;
  border: 1px solid rgba(10, 20, 40, .06);
  border-radius: clamp(20px, 1.8vw, 32px);
  box-shadow: 0 20px 60px rgba(10, 20, 40, .08);
  overflow: hidden;
}

/* ---- 上区：标题 ---- */
.system-demo__head {
  padding: clamp(36px, 3.6vw, 64px) clamp(32px, 3.4vw, 64px) clamp(28px, 2.6vw, 48px);
  background: #FFFFFF;
  text-align: center;
}

.system-demo__title {
  margin: 0 0 clamp(12px, 1.2vw, 20px);
  font-size: clamp(26px, 3vw, 48px);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.01em;
}

.system-demo__subtitle {
  margin: 0;
  font-size: clamp(14px, 1.05vw, 18px);
  font-weight: 500;
  color: rgba(10, 20, 40, .55);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- 中区：浅蓝舞台 + 电脑 swiper + 两侧箭头 ---- */

.system-demo__stage {
  position: relative;
  background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
  padding: clamp(48px, 5vw, 96px) clamp(60px, 6vw, 120px);
  min-height: clamp(280px, 36vw, 520px);
}

.system-demo__swiper {
  width: 100%;
  overflow: hidden;
  /* padding-top 让顶部摄像头/边框不被裁；padding-bottom 给阴影空间 */
  padding: clamp(8px, .8vw, 14px) 0 clamp(24px, 2.4vw, 40px);
}

.system-demo__swiper .swiper-wrapper {
  /* GPU 加速 wrapper 移动 */
  will-change: transform;
}

.system-demo__slide {
  display: flex !important;
  align-items: center;
  justify-content: center;
  padding: 0 clamp(8px, 1vw, 16px);
  box-sizing: border-box;
  height: auto;
  /* GPU 加速 + 隔离绘制：让切换更丝滑 */
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  contain: layout style paint;
}

/* ---- 笔记本 MacBook 风 mockup ---- */

.system-demo__laptop {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  /* 之前用 filter: drop-shadow，每帧重绘开销大，改用 box-shadow 在 screen 上 */
}

/* 屏幕外框：深色边框 + 外阴影（取代 filter:drop-shadow，性能更好） */
.system-demo__laptop-screen {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  padding: clamp(10px, .9vw, 14px) clamp(10px, .9vw, 14px) clamp(14px, 1.2vw, 18px);
  border-radius: clamp(14px, 1.2vw, 20px) clamp(14px, 1.2vw, 20px) clamp(6px, .5vw, 10px) clamp(6px, .5vw, 10px);
  background: linear-gradient(180deg, #2a2f38 0%, #1a1d24 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .08),
    inset 0 -2px 0 rgba(0, 0, 0, .5),
    0 24px 50px rgba(10, 20, 40, .2),
    0 10px 20px rgba(10, 20, 40, .12);
  box-sizing: border-box;
}

/* 摄像头小圆点 */
.system-demo__laptop-camera {
  position: absolute;
  top: clamp(4px, .35vw, 6px);
  left: 50%;
  width: clamp(6px, .45vw, 8px);
  height: clamp(6px, .45vw, 8px);
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #4a4f58 0%, #1a1d24 70%);
  box-shadow: inset 0 0 1px rgba(255, 255, 255, .2);
  transform: translateX(-50%);
}

/* 屏幕显示区（黑底 + 截图填充） */
.system-demo__laptop-display {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: clamp(4px, .35vw, 6px);
  background: #0A0E1F;
  overflow: hidden;
}

.system-demo__laptop-display img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}

/* 底座（键盘部分 + 触控板暗示） */
.system-demo__laptop-base {
  position: relative;
  width: 108%;
  height: clamp(14px, 1.2vw, 18px);
  margin: 0 auto;
  margin-left: -4%;
  border-radius: 0 0 clamp(10px, .8vw, 14px) clamp(10px, .8vw, 14px);
  background: linear-gradient(180deg, #2a2f38 0%, #1a1d24 60%, #1a1d24 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .1),
    inset 0 -3px 6px rgba(0, 0, 0, .3);
}

/* 铰链凹槽 */
.system-demo__laptop-hinge {
  position: absolute;
  top: 0;
  left: 50%;
  width: 22%;
  height: clamp(4px, .35vw, 6px);
  border-radius: 0 0 50% 50% / 0 0 100% 100%;
  background: linear-gradient(180deg, #0a0c10 0%, #1a1d24 100%);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, .6);
  transform: translateX(-50%);
}

/* ---- 自定义箭头按钮（左右悬浮） ---- */

.system-demo__nav {
  position: absolute;
  top: 50%;
  z-index: 10;
  width: clamp(40px, 3.4vw, 56px);
  height: clamp(40px, 3.4vw, 56px);
  border-radius: 50%;
  border: 1px solid rgba(10, 20, 40, .08);
  background: rgba(255, 255, 255, .92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  box-shadow: 0 6px 18px rgba(10, 20, 40, .12);
  transform: translate3d(0, -50%, 0);
  transition:
    background .3s var(--ease),
    color .3s var(--ease),
    border-color .3s var(--ease),
    transform .3s var(--ease),
    box-shadow .3s var(--ease);
  -webkit-tap-highlight-color: transparent;
}

.system-demo__nav--prev { left: clamp(12px, 1.4vw, 28px); }
.system-demo__nav--next { right: clamp(12px, 1.4vw, 28px); }

.system-demo__nav svg {
  width: clamp(18px, 1.4vw, 24px);
  height: clamp(18px, 1.4vw, 24px);
  pointer-events: none;
}

@media (hover: hover) {
  .system-demo__nav:hover {
    background: var(--text);
    color: #FFFFFF;
    border-color: var(--text);
    transform: translate3d(0, -50%, 0) scale(1.05);
    box-shadow: 0 10px 24px rgba(10, 20, 40, .2);
  }
}

.system-demo__nav:active {
  transform: translate3d(0, -50%, 0) scale(0.94);
}

/* ---- 下区：caption + 自定义长条分页器 ---- */

.system-demo__footer {
  padding: clamp(28px, 2.6vw, 48px) clamp(32px, 3.4vw, 64px) clamp(36px, 3.6vw, 64px);
  background: #FFFFFF;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(20px, 2vw, 32px);
  text-align: center;
}

.system-demo__caption-stage {
  display: flex;
  flex-direction: column;
  gap: clamp(6px, .6vw, 12px);
  min-height: clamp(60px, 5.2vw, 84px);
  width: 100%;
}

.system-demo__caption-title {
  margin: 0;
  font-size: clamp(20px, 2vw, 30px);
  font-weight: 600;
  color: var(--text);
  line-height: 1.25;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.system-demo__caption-desc {
  margin: 0;
  font-size: clamp(14px, 1vw, 17px);
  font-weight: 500;
  color: rgba(10, 20, 40, .55);
  line-height: 1.5;
}

/* 自定义长条分页器 */
.system-demo__pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: clamp(8px, .7vw, 12px);
}

.system-demo__pagination-bullet {
  position: relative;
  width: clamp(24px, 1.8vw, 32px);
  height: clamp(4px, .35vw, 6px);
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(10, 20, 40, .12);
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
  transition:
    width .55s var(--ease),
    background-color .35s var(--ease);
}

.system-demo__pagination-bullet[aria-selected="true"] {
  width: clamp(48px, 4.5vw, 72px);
  background: rgba(56, 189, 248, .25);
}

.system-demo__pagination-bullet::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, #38BDF8, #6BB4FF);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .35s var(--ease);
}

.system-demo__pagination-bullet[aria-selected="true"]::after {
  transform: scaleX(1);
  transition: transform .55s var(--ease);
}

@media (hover: hover) {
  .system-demo__pagination-bullet:hover {
    background: rgba(10, 20, 40, .22);
  }
  .system-demo__pagination-bullet[aria-selected="true"]:hover {
    background: rgba(56, 189, 248, .32);
  }
}

/* ---- 响应式 ---- */

@media (max-width: 1023px) {
  .system-demo__stage {
    padding: clamp(36px, 6vw, 56px) clamp(48px, 7vw, 80px);
  }

  .system-demo__laptop {
    max-width: 720px;
  }
}

@media (max-width: 767px) {
  .system-demo__head {
    padding: clamp(24px, 6vw, 36px) clamp(20px, 5vw, 28px) clamp(20px, 5vw, 28px);
  }

  .system-demo__title { font-size: clamp(22px, 6vw, 28px); }
  .system-demo__subtitle { font-size: clamp(13px, 3.6vw, 15px); }

  .system-demo__stage {
    padding: clamp(24px, 5vw, 36px) clamp(32px, 8vw, 48px);
  }

  .system-demo__nav {
    width: 36px;
    height: 36px;
  }

  .system-demo__nav--prev { left: 8px; }
  .system-demo__nav--next { right: 8px; }

  .system-demo__footer {
    padding: clamp(20px, 5vw, 28px) clamp(20px, 5vw, 28px) clamp(28px, 6vw, 36px);
    gap: clamp(16px, 4vw, 22px);
  }

  .system-demo__caption-title { font-size: clamp(18px, 5vw, 22px); }
  .system-demo__caption-desc { font-size: clamp(13px, 3.6vw, 15px); }

  .system-demo__caption-stage { min-height: clamp(56px, 14vw, 72px); }
}

@media (prefers-reduced-motion: reduce) {
  .system-demo__nav,
  .system-demo__pagination-bullet,
  .system-demo__pagination-bullet::after,
  .system-demo__caption-title,
  .system-demo__caption-desc {
    transition: none !important;
  }
}