/* V3.2 品牌视觉 · 使用 app/static/images/brand/ 下用户提供的素材 */

.site-body {
  position: relative;
  min-height: 100vh;
  background: var(--color-bg);
}

.site-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-color: #ff9a3c;
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
}

.site-body--home .site-bg,
.site-body--home .site-scrim {
  display: none;
}

.site-body--inner .site-bg {
  opacity: var(--inner-bg-dim);
  filter: blur(var(--inner-bg-blur)) saturate(0.92);
  transform: scale(1.04);
}

/* 年级选择页：保留背景场景，减少发白与模糊 */
.site-body--grades .site-bg {
  opacity: 1;
  filter: saturate(1) brightness(1);
  transform: none;
}

.site-body--grades .site-scrim {
  background: linear-gradient(
    180deg,
    rgba(255, 248, 240, 0.18) 0%,
    rgba(255, 246, 236, 0.32) 100%
  );
}

/* 上下册 / 知识点页：轻蒙层，保留背景层次 */
.site-body--learning .site-bg {
  opacity: 1;
  filter: saturate(1) brightness(1);
  transform: none;
}

.site-body--learning .site-scrim {
  background: linear-gradient(
    90deg,
    rgba(255, 244, 222, 0.52) 0%,
    rgba(255, 236, 202, 0.38) 50%,
    rgba(255, 215, 145, 0.25) 100%
  );
}

/* 练习页：轻蒙层，保留 bg-inner-01 场景 */
.site-body--practice .site-bg {
  opacity: 1;
  filter: saturate(1) brightness(1);
  transform: none;
}

.site-body--practice .site-scrim {
  background: linear-gradient(
    90deg,
    rgba(255, 245, 225, 0.5) 0%,
    rgba(255, 238, 208, 0.36) 50%,
    rgba(255, 218, 155, 0.24) 100%
  );
}

.site-body--inner.site-bg--01 .site-bg {
  background-image: url("../images/brand/bg-inner-01.png");
}

.site-body--inner.site-bg--02 .site-bg {
  background-image: url("../images/brand/bg-inner-02.png");
}

.site-body--inner.site-bg--03 .site-bg {
  background-image: url("../images/background-babahomework-v2.jpg");
  background-image: image-set(
    url("../images/background-babahomework-v2.webp") type("image/webp"),
    url("../images/background-babahomework-v2.jpg") type("image/jpeg")
  );
  background-position: 70% center;
}

.site-body--inner.site-bg--04 .site-bg {
  background-image: url("../images/brand/bg-inner-04.png");
}

.site-body--inner.site-bg--05 .site-bg {
  background-image: url("../images/brand/bg-inner-05.png");
}

.site-scrim {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(255, 248, 240, 0.55) 0%,
    rgba(255, 246, 236, 0.78) 100%
  );
}

.site-body .page {
  position: relative;
  z-index: 1;
}

.brand-logo {
  display: block;
  height: auto;
  background: transparent;
}

.brand-logo--header {
  width: min(180px, 52vw);
  margin-bottom: 8px;
}

.brand-logo--home {
  width: min(240px, 62vw);
  margin-bottom: 12px;
}