/* ===== 页面专属：about ===== */
.page-about {
  --about-number-size: 4rem;
  --about-number-line: 1;
  --about-gap: 2rem;
  --about-card-min-h: 180px;
  --about-statement-bg: var(--color-warm-paper);
  color: var(--color-white);
  background-color: var(--color-deep-night);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 1rem 1.25rem 0;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-warm-paper);
  opacity: 0.75;
  max-width: var(--max-width);
  margin: 0 auto;
}
.page-about .breadcrumb a {
  color: var(--color-pitch-green);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--color-flame-red);
}
.page-about .breadcrumb__sep {
  margin: 0 0.4em;
  color: var(--color-dark-gray);
}

/* ---------- 首屏 杂志跨页 ---------- */
.page-about .about-hero {
  display: flex;
  flex-direction: column;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem;
  gap: 1.5rem;
}

.page-about .about-hero__left {
  background: var(--color-warm-paper);
  color: var(--color-deep-night);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-radius: var(--radius-md);
}

.page-about .about-hero__number {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--about-number-size);
  line-height: var(--about-number-line);
  color: var(--color-deep-night);
  opacity: 0.2;
  transition: transform var(--transition-base), opacity var(--transition-base), color var(--transition-base);
  cursor: default;
  user-select: none;
}
.page-about .about-hero__number:hover,
.page-about .about-hero__number:focus-visible {
  transform: scale(1.25);
  opacity: 0.6;
  color: var(--color-flame-red);
}

.page-about .about-hero__quote {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  margin: 0.5rem 0 0.25rem;
  padding: 0;
  border: none;
  color: var(--color-deep-night);
}

.page-about .about-hero__sub {
  font-family: var(--font-body);
  font-size: 0.9rem;
  opacity: 0.7;
  margin: 0;
}

.page-about .about-hero__right {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .about-hero__img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1.1;
  margin: 0;
  color: var(--color-white);
  text-shadow: 0 2px 12px rgba(0,0,0,0.6);
  letter-spacing: 0.02em;
}

.page-about .about-hero__desc {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-warm-paper);
  opacity: 0.85;
  max-width: 640px;
  margin: 0;
}

/* ---------- 品牌DNA ---------- */
.page-about .about-dna {
  position: relative;
  margin: 2rem 0;
  overflow: hidden;
}

.page-about .about-dna__bg-wrap {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;
}
.page-about .about-dna__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  filter: brightness(0.25) saturate(0.8);
}

.page-about .about-dna__overlay {
  position: relative;
  z-index: 1;
  background: rgba(11, 14, 20, 0.75);
  padding: 2.5rem 1.25rem;
  backdrop-filter: blur(3px);
}

.page-about .about-dna__header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  max-width: var(--max-width);
  margin: 0 auto 2rem;
}

.page-about .about-dna__number {
  font-family: var(--font-heading);
  font-size: var(--about-number-size);
  line-height: var(--about-number-line);
  color: var(--color-pitch-green);
  opacity: 0.3;
  transition: transform var(--transition-base), opacity var(--transition-base), color var(--transition-base);
  cursor: default;
  user-select: none;
}
.page-about .about-dna__number:hover,
.page-about .about-dna__number:focus-visible {
  transform: scale(1.25);
  opacity: 0.7;
  color: var(--color-gold);
}

.page-about .about-dna__title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-white);
  letter-spacing: 0.03em;
}

.page-about .about-dna__grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-about .about-dna__card {
  background: var(--color-dark-gray);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border-left: 4px solid var(--color-pitch-green);
}
.page-about .about-dna__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.page-about .about-dna__card-icon {
  display: inline-block;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--color-gold);
  margin-bottom: 0.5rem;
}

.page-about .about-dna__card-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
  color: var(--color-white);
}

.page-about .about-dna__card-text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-warm-paper);
  opacity: 0.8;
  margin: 0;
}

/* ---------- 我们的服务 ---------- */
.page-about .about-services {
  background: var(--color-warm-paper);
  color: var(--color-deep-night);
  padding: 2.5rem 1.25rem;
  margin: 0;
}

.page-about .about-services__header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  max-width: var(--max-width);
  margin: 0 auto 2rem;
}

.page-about .about-services__number {
  font-family: var(--font-heading);
  font-size: var(--about-number-size);
  line-height: var(--about-number-line);
  color: var(--color-flame-red);
  opacity: 0.25;
  transition: transform var(--transition-base), opacity var(--transition-base), color var(--transition-base);
  cursor: default;
  user-select: none;
}
.page-about .about-services__number:hover,
.page-about .about-services__number:focus-visible {
  transform: scale(1.25);
  opacity: 0.6;
  color: var(--color-pitch-green);
}

.page-about .about-services__title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-deep-night);
  letter-spacing: 0.03em;
}

.page-about .about-services__layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-about .about-services__list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about .about-services__item {
  background: rgba(11, 14, 20, 0.04);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(11, 14, 20, 0.1);
  transition: background var(--transition-fast);
}
.page-about .about-services__item[open] {
  background: rgba(11, 14, 20, 0.07);
}

.page-about .about-services__item-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  padding: 1rem 1.25rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-deep-night);
  transition: color var(--transition-fast);
}
.page-about .about-services__item-title::-webkit-details-marker {
  display: none;
}
.page-about .about-services__item-title:hover,
.page-about .about-services__item-title:focus-visible {
  color: var(--color-flame-red);
}

.page-about .about-services__item-arrow {
  font-size: 0.7rem;
  transition: transform var(--transition-fast);
}
.page-about .about-services__item[open] .about-services__item-arrow {
  transform: rotate(180deg);
}

.page-about .about-services__item-text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.7;
  padding: 0 1.25rem 1rem;
  margin: 0;
  color: var(--color-deep-night);
  opacity: 0.8;
}

.page-about .about-services__visual {
  flex-shrink: 0;
}

.page-about .about-services__img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

/* ---------- 为什么选择开yun ---------- */
.page-about .about-why {
  padding: 2.5rem 1.25rem;
  background: var(--color-deep-night);
}

.page-about .about-why__header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  max-width: var(--max-width);
  margin: 0 auto 2rem;
}

.page-about .about-why__number {
  font-family: var(--font-heading);
  font-size: var(--about-number-size);
  line-height: var(--about-number-line);
  color: var(--color-gold);
  opacity: 0.25;
  transition: transform var(--transition-base), opacity var(--transition-base), color var(--transition-base);
  cursor: default;
  user-select: none;
}
.page-about .about-why__number:hover,
.page-about .about-why__number:focus-visible {
  transform: scale(1.25);
  opacity: 0.7;
  color: var(--color-flame-red);
}

.page-about .about-why__title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-white);
  letter-spacing: 0.03em;
}

.page-about .about-why__grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-about .about-why__card {
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid rgba(255,255,255,0.08);
}
.page-about .about-why__card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-card);
}

.page-about .about-why__card--green {
  background: linear-gradient(145deg, rgba(0,230,118,0.12), rgba(0,230,118,0.04));
  border-left: 4px solid var(--color-pitch-green);
}
.page-about .about-why__card--red {
  background: linear-gradient(145deg, rgba(255,23,68,0.12), rgba(255,23,68,0.04));
  border-left: 4px solid var(--color-flame-red);
}
.page-about .about-why__card--gold {
  background: linear-gradient(145deg, rgba(255,215,0,0.12), rgba(255,215,0,0.04));
  border-left: 4px solid var(--color-gold);
}

.page-about .about-why__card-num {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 2rem;
  line-height: 1;
  margin-bottom: 0.5rem;
  color: var(--color-white);
  opacity: 0.3;
}

.page-about .about-why__card-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
  color: var(--color-white);
}

.page-about .about-why__card-text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-warm-paper);
  opacity: 0.8;
  margin: 0;
}

/* ---------- 品牌宣言 ---------- */
.page-about .about-statement {
  background: var(--about-statement-bg);
  color: var(--color-deep-night);
  padding: 2.5rem 1.25rem;
}

.page-about .about-statement__inner {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  max-width: var(--max-width);
  margin: 0 auto;
  align-items: center;
}

.page-about .about-statement__media {
  flex-shrink: 0;
}

.page-about .about-statement__img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.page-about .about-statement__content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  text-align: center;
}

.page-about .about-statement__quote {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 400;
  line-height: 1.7;
  margin: 0;
  padding: 0 0 0 1rem;
  border-left: 4px solid var(--color-pitch-green);
  text-align: left;
  color: var(--color-deep-night);
  opacity: 0.85;
}

.page-about .about-statement__action {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin: 0.5rem 0 0;
}

.page-about .about-statement__contact {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-deep-night);
  opacity: 0.5;
  margin: 0;
}

/* ---------- 桌面端 媒体查询 ---------- */
@media (min-width: 768px) {
  .page-about {
    --about-number-size: 5.5rem;
  }

  .page-about .breadcrumb {
    padding: 1rem 2rem 0;
  }

  /* 首屏：左右分栏 */
  .page-about .about-hero {
    flex-direction: row;
    padding: 2rem;
    gap: 0;
    align-items: stretch;
  }
  .page-about .about-hero__left {
    flex: 0 0 36%;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    padding: 3rem 2rem;
  }
  .page-about .about-hero__right {
    flex: 1;
    padding: 0 0 0 2rem;
    justify-content: center;
  }
  .page-about .about-hero__title {
    font-size: 3.6rem;
  }
  .page-about .about-hero__desc {
    font-size: 1.05rem;
  }

  /* DNA 网格 */
  .page-about .about-dna__grid {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .page-about .about-dna__card {
    flex: 1 1 calc(33.333% - 1rem);
    min-height: var(--about-card-min-h);
  }

  /* 服务：左右布局 */
  .page-about .about-services__layout {
    flex-direction: row;
    align-items: flex-start;
  }
  .page-about .about-services__list {
    flex: 1;
  }
  .page-about .about-services__visual {
    flex: 0 0 42%;
  }

  /* 为什么选择：三列 */
  .page-about .about-why__grid {
    flex-direction: row;
  }
  .page-about .about-why__card {
    flex: 1;
  }

  /* 品牌宣言：左右 */
  .page-about .about-statement__inner {
    flex-direction: row;
    align-items: center;
    text-align: left;
  }
  .page-about .about-statement__media {
    flex: 0 0 38%;
  }
  .page-about .about-statement__content {
    flex: 1;
    text-align: left;
  }
  .page-about .about-statement__action {
    justify-content: flex-start;
  }
  .page-about .about-statement__quote {
    font-size: 1.3rem;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-number-size: 7rem;
  }

  .page-about .about-hero__left {
    padding: 4rem 2.5rem;
  }
  .page-about .about-hero__title {
    font-size: 4.5rem;
  }
  .page-about .about-hero__desc {
    font-size: 1.15rem;
  }

  .page-about .about-dna__overlay {
    padding: 4rem 2rem;
  }
  .page-about .about-dna__title {
    font-size: 2.2rem;
  }

  .page-about .about-services {
    padding: 4rem 2rem;
  }
  .page-about .about-services__title {
    font-size: 2.2rem;
  }

  .page-about .about-why {
    padding: 4rem 2rem;
  }
  .page-about .about-why__title {
    font-size: 2.2rem;
  }

  .page-about .about-statement {
    padding: 4rem 2rem;
  }
  .page-about .about-statement__quote {
    font-size: 1.45rem;
  }
}