/* 美颜引擎介绍页 · 图文版式对齐主流美颜产品官网 */
:root {
  --by-pink: #ff5a8a;
  --by-pink-deep: #e91e63;
  --by-ink: #1c1a1f;
  --by-muted: #6f6673;
  --by-bg: #fff;
  --by-alt: #fff6f9;
}

.bce-body--beauty .bce-main,
.bce-body--beauty main {
  max-width: none;
}

.by-page {
  color: var(--by-ink);
  background: #fff;
  overflow-x: clip;
}

.by-wrap {
  width: min(1180px, 92vw);
  margin: 0 auto;
}

/* —— Hero —— */
.by-hero {
  position: relative;
  min-height: min(92vh, 900px);
  display: grid;
  align-items: end;
  color: #fff;
  isolation: isolate;
}
.by-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.by-hero__photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}
.by-hero__shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(20, 8, 16, 0.72) 0%, rgba(20, 8, 16, 0.35) 42%, rgba(20, 8, 16, 0.12) 70%, transparent 100%),
    linear-gradient(180deg, transparent 40%, rgba(20, 8, 16, 0.55) 100%);
}
.by-hero__content {
  position: relative;
  z-index: 1;
  width: min(1180px, 92vw);
  margin: 0 auto;
  padding: 120px 0 88px;
}
.by-hero__brand {
  margin: 0 0 14px;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  color: #ffd0de;
}
.by-hero__title {
  margin: 0 0 16px;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: 0.02em;
  text-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
}
.by-hero__desc {
  margin: 0 0 28px;
  max-width: 28em;
  font-size: 17px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.9);
}
.by-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.by-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.by-btn--primary {
  background: linear-gradient(135deg, #ff7aa8, #e91e63);
  color: #fff;
  box-shadow: 0 12px 30px rgba(233, 30, 99, 0.35);
}
.by-btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(233, 30, 99, 0.42);
}
.by-btn--ghost {
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: #fff;
  backdrop-filter: blur(8px);
}
.by-btn--ghost:hover { background: rgba(255, 255, 255, 0.24); }
.by-btn--ghost-dark {
  background: #fff;
  border: 1px solid rgba(28, 26, 31, 0.12);
  color: var(--by-ink);
}

/* —— Sections —— */
.by-block {
  padding: 88px 0;
  background: #fff;
}
.by-block--alt {
  background: linear-gradient(180deg, #fff7fa 0%, #fff 55%);
}
.by-block--video {
  background: linear-gradient(145deg, #1a1016 0%, #3b1528 48%, #6b1f42 100%);
  color: #fff;
}

.by-head {
  text-align: center;
  margin-bottom: 48px;
}
.by-head--light { color: #fff; }
.by-eyebrow {
  margin: 0 0 10px;
  color: var(--by-pink-deep);
  font-size: 14px;
  font-weight: 650;
  letter-spacing: 0.12em;
}
.by-eyebrow--light { color: #ffb4cb; }
.by-title {
  margin: 0 0 12px;
  font-size: clamp(1.7rem, 3.2vw, 2.5rem);
  font-weight: 800;
  letter-spacing: 0.02em;
}
.by-title--light { color: #fff; }
.by-sub {
  margin: 0 auto;
  max-width: 40em;
  color: var(--by-muted);
  line-height: 1.8;
  font-size: 15px;
}
.by-sub--light { color: rgba(255, 255, 255, 0.78); }

.by-cards3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}
.by-card {
  background: #fff;
  border-radius: 22px;
  overflow: hidden;
  box-shadow: 0 18px 48px rgba(40, 10, 24, 0.08);
  border: 1px solid rgba(28, 26, 31, 0.05);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.by-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 56px rgba(40, 10, 24, 0.14);
}
.by-card__media {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: #f3e6ec;
}
.by-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.45s ease;
}
.by-card:hover .by-card__media img {
  transform: scale(1.05);
}
.by-card__body {
  padding: 20px 20px 24px;
}
.by-card__body h3 {
  margin: 0 0 8px;
  font-size: 18px;
}
.by-card__body p {
  margin: 0 0 14px;
  color: var(--by-muted);
  font-size: 14px;
  line-height: 1.7;
}
.by-more {
  color: var(--by-pink-deep);
  font-weight: 650;
  text-decoration: none;
  font-size: 14px;
}
.by-more:hover { text-decoration: underline; }

.by-showcase {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 64px;
}
.by-showcase--flip .by-showcase__visual { order: 2; }
.by-showcase--flip .by-showcase__copy { order: 1; }
.by-showcase__visual {
  border-radius: 28px;
  overflow: hidden;
  background: #ffe6ef;
  box-shadow: 0 22px 60px rgba(40, 10, 24, 0.12);
  min-height: 360px;
}
.by-showcase__visual img {
  width: 100%;
  height: 100%;
  min-height: 360px;
  object-fit: cover;
  display: block;
}
.by-showcase__copy h3 {
  margin: 0 0 14px;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  line-height: 1.35;
}
.by-showcase__copy p {
  margin: 0 0 22px;
  color: var(--by-muted);
  line-height: 1.85;
  font-size: 15px;
}

.by-ai-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.by-ai {
  border-radius: 22px;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(28, 26, 31, 0.06);
  box-shadow: 0 14px 36px rgba(40, 10, 24, 0.07);
  transition: transform 0.25s ease;
}
.by-ai:hover { transform: translateY(-4px); }
.by-ai > img {
  width: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  display: block;
  background: #f3e6ec;
}
.by-ai__body {
  padding: 18px 18px 20px;
}
.by-ai__body h3 {
  margin: 0 0 8px;
  font-size: 17px;
}
.by-ai__body p {
  margin: 0 0 12px;
  color: var(--by-muted);
  font-size: 13px;
  line-height: 1.7;
}

.by-video-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 36px;
}
.by-video {
  margin: 0;
  border-radius: 22px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
}
.by-video video,
.by-video img {
  width: 100%;
  aspect-ratio: 9 / 14;
  object-fit: cover;
  display: block;
  background: #2a1520;
}
.by-video figcaption {
  padding: 14px 16px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.86);
}
.by-center {
  text-align: center;
}

.by-cta {
  padding: 72px 0 96px;
  background: var(--by-alt);
}
.by-cta__box {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 36px;
  align-items: center;
  background: #fff;
  border-radius: 28px;
  overflow: hidden;
  box-shadow: 0 22px 60px rgba(40, 10, 24, 0.1);
}
.by-cta__banner {
  width: 100%;
  height: 100%;
  min-height: 280px;
  object-fit: cover;
  display: block;
}
.by-cta__text {
  padding: 36px 36px 36px 8px;
}
.by-cta__text h2 {
  margin: 0 0 12px;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
}
.by-cta__text p {
  margin: 0 0 22px;
  color: var(--by-muted);
  line-height: 1.8;
}

.by-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.by-reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (max-width: 980px) {
  .by-hero {
    min-height: 72vh;
  }
  .by-hero__content {
    padding: 100px 0 56px;
  }
  .by-cards3,
  .by-ai-grid,
  .by-video-grid,
  .by-showcase,
  .by-showcase--flip,
  .by-cta__box {
    grid-template-columns: 1fr;
  }
  .by-showcase--flip .by-showcase__visual,
  .by-showcase--flip .by-showcase__copy {
    order: initial;
  }
  .by-showcase__visual img {
    min-height: 280px;
  }
  .by-cta__text {
    padding: 24px;
  }
  .by-video video,
  .by-video img {
    aspect-ratio: 16 / 10;
  }
}