/* ==========================================================
   BSPORTS 品牌故事页 · scope: .page-about
   非对称纵向时间轴 · 展览画册式布局
========================================================== */
.page-about {
  --about-grid: rgba(0, 255, 157, 0.035);
  --about-line: rgba(0, 255, 157, 0.3);
  --about-entry-pad: 72px;
  --about-card-bg: rgba(27, 38, 59, 0.72);
  --about-shadow: 0 18px 36px rgba(0, 0, 0, 0.22);
  background: var(--clr-bg);
  color: var(--clr-white);
  overflow: hidden;
  scroll-margin-top: var(--header-h);
}

/* ---------- 英雄区 ---------- */
.page-about .about-hero {
  position: relative;
  padding: var(--space-4) 0 var(--space-8);
  background:
    radial-gradient(ellipse at 88% 18%, rgba(0, 255, 157, 0.09), transparent 52%),
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: auto, 72px 72px, 72px 72px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 22%;
  height: 6px;
  background: linear-gradient(90deg, transparent, var(--clr-accent), var(--clr-gold));
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--clr-accent) 0%, rgba(0, 255, 157, 0.15) 42%, transparent 80%);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: var(--space-6);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--space-6);
}

.page-about .about-hero__copy .section-label {
  color: var(--clr-accent);
  margin-bottom: var(--space-3);
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5.4vw, 3.75rem);
  font-weight: var(--heading-weight);
  line-height: 1.06;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 var(--space-4);
}

.page-about .about-hero__sep {
  color: var(--clr-accent);
  margin: 0 0.18em;
}

.page-about .about-hero__site {
  color: var(--clr-white);
}

.page-about .about-hero__lead {
  font-size: 1.125rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.85);
  max-width: 46ch;
  margin: 0 0 var(--space-5);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.page-about .about-hero__cta .btn-outline {
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--clr-white);
}

.page-about .about-hero__cta .btn-outline:hover,
.page-about .about-hero__cta .btn-outline:focus-visible {
  background: var(--clr-accent);
  border-color: var(--clr-accent);
  color: var(--clr-bg);
}

.page-about .about-hero__fig {
  position: relative;
  margin: 0;
  padding: var(--space-4);
  border: 1px solid rgba(0, 255, 157, 0.32);
  border-left: 4px solid var(--clr-accent);
  background: var(--about-card-bg);
  box-shadow: var(--about-shadow);
  transform: skewX(-2deg);
}

.page-about .about-hero__fig::after {
  content: "";
  position: absolute;
  right: 10px;
  bottom: 10px;
  width: 32px;
  height: 32px;
  border-right: 2px solid var(--clr-gold);
  border-bottom: 2px solid var(--clr-gold);
  opacity: 0.7;
  pointer-events: none;
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  transform: skewX(2deg);
}

.page-about .about-hero__fig figcaption {
  margin-top: var(--space-3);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.58);
}

/* ---------- 品牌起点（浅色面） ---------- */
.page-about .about-origins {
  position: relative;
  background: var(--clr-light);
  color: var(--clr-dark);
  padding: var(--space-7) 0;
}

.page-about .about-origins::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 140px;
  height: 4px;
  background: var(--clr-gold);
}

.page-about .about-origins .section-label {
  color: var(--clr-dark);
  margin-bottom: var(--space-3);
}

.page-about .about-origins h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  font-weight: var(--heading-weight);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  line-height: 1.15;
  margin: 0 0 var(--space-5);
  max-width: 22ch;
}

.page-about .about-origins__body {
  display: grid;
  gap: var(--space-6);
}

.page-about .about-origins__text p {
  margin: 0 0 var(--space-4);
}

.page-about .about-origins__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-origins__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.page-about .about-origins__stat {
  border-top: 2px solid var(--clr-accent-dark);
  padding-top: var(--space-3);
}

.page-about .about-origins__stat-num {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--heading-weight);
  font-size: 1.6rem;
  line-height: 1.1;
  color: var(--clr-dark);
}

.page-about .about-origins__stat-label {
  display: block;
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  color: rgba(26, 26, 26, 0.64);
}

/* ---------- 里程碑（深色面） ---------- */
.page-about .about-milestones {
  position: relative;
  padding: var(--space-7) 0 var(--space-8);
}

.page-about .about-milestones__head {
  margin-bottom: var(--space-7);
}

.page-about .about-milestones .section-label {
  color: var(--clr-accent);
  margin-bottom: var(--space-3);
}

.page-about .about-milestones h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  font-weight: var(--heading-weight);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  line-height: 1.15;
  margin: 0;
}

.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline__line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 19px;
  width: 2px;
  background: linear-gradient(to bottom, var(--about-line) 0%, rgba(0, 255, 157, 0.05) 100%);
  transform: translateX(-50%);
}

.page-about .about-timeline__entries {
  position: relative;
}

.page-about .about-milestone-entry {
  position: relative;
  margin-bottom: var(--space-6);
  padding-left: var(--about-entry-pad);
}

.page-about .about-milestone-entry:last-of-type {
  margin-bottom: var(--space-7);
}

.page-about .about-milestone-entry__dot {
  position: absolute;
  left: 19px;
  top: 32px;
  width: 14px;
  height: 14px;
  border-radius: 2px;
  background: var(--clr-bg);
  border: 3px solid var(--clr-accent);
  transform: translate(-50%, -50%) rotate(45deg);
  transition: background var(--transition-fast), box-shadow var(--transition-base);
  z-index: 1;
}

.page-about .about-milestone-entry:hover .about-milestone-entry__dot,
.page-about .about-milestone-entry:focus-within .about-milestone-entry__dot {
  background: var(--clr-accent);
  box-shadow: 0 0 0 5px rgba(0, 255, 157, 0.15);
}

.page-about .about-milestone-entry.is-current .about-milestone-entry__dot {
  background: var(--clr-gold);
  border-color: var(--clr-gold);
  box-shadow: 0 0 0 4px rgba(255, 215, 0, 0.16);
}

.page-about .about-milestone-card {
  position: relative;
  padding: var(--space-4) var(--space-5);
  background: var(--about-card-bg);
  border: 1px solid rgba(255, 255, 255, 0.07);
  box-shadow: var(--about-shadow);
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.page-about .about-milestone-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--clr-accent);
  transform: scaleY(0.4);
  transform-origin: top;
  transition: transform var(--transition-base), background var(--transition-fast);
  pointer-events: none;
}

.page-about .about-milestone-card:hover,
.page-about .about-milestone-card:focus-within {
  transform: translateY(-3px);
  border-color: rgba(0, 255, 157, 0.4);
}

.page-about .about-milestone-card:hover::before,
.page-about .about-milestone-card:focus-within::before {
  transform: scaleY(1);
  background: var(--clr-gold);
}

.page-about .about-milestone-entry.is-current .about-milestone-card {
  border-color: rgba(255, 215, 0, 0.28);
}

.page-about .about-milestone-entry.is-current .about-milestone-card::before {
  background: var(--clr-gold);
  transform: scaleY(1);
}

.page-about .about-milestone-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-3);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.page-about .about-milestone-card__year {
  color: rgba(255, 255, 255, 0.62);
}

.page-about .about-milestone-card__tag {
  display: inline-block;
  padding: 2px 10px;
  background: var(--clr-accent);
  color: var(--clr-bg);
  font-family: var(--font-heading);
  font-weight: var(--heading-weight);
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  transform: skewX(-8deg);
}

.page-about .about-milestone-entry.is-current .about-milestone-card__tag {
  background: var(--clr-gold);
  color: var(--clr-bg);
}

.page-about .about-milestone-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: var(--heading-weight);
  letter-spacing: 0.04em;
  line-height: 1.3;
  margin: 0 0 var(--space-3);
  color: var(--clr-white);
}

.page-about .about-milestone-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.74);
}

.page-about .about-milestone-card__link {
  display: inline-block;
  margin-top: var(--space-4);
  color: var(--clr-accent);
  text-decoration: underline;
  text-decoration-color: rgba(0, 255, 157, 0.35);
  text-underline-offset: 4px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.page-about .about-milestone-card__link:hover,
.page-about .about-milestone-card__link:focus-visible {
  color: var(--clr-gold);
  text-decoration-color: var(--clr-gold);
}

.page-about .about-milestone-feature {
  margin: var(--space-5) 0 0 var(--about-entry-pad);
  width: calc(100% - var(--about-entry-pad));
  max-width: 400px;
  padding: var(--space-3);
  border: 1px dashed rgba(0, 255, 157, 0.3);
  background: rgba(0, 255, 157, 0.03);
}

.page-about .about-milestone-feature img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .about-milestone-feature figcaption {
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- 团队与本地基因（浅色面） ---------- */
.page-about .about-team {
  position: relative;
  background: var(--clr-light);
  color: var(--clr-dark);
  padding: var(--space-7) 0;
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 140px;
  height: 4px;
  background: var(--clr-accent-dark);
}

.page-about .about-team__inner {
  display: grid;
  gap: var(--space-6);
  align-items: center;
}

.page-about .about-team .section-label {
  color: var(--clr-dark);
  margin-bottom: var(--space-3);
}

.page-about .about-team h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  font-weight: var(--heading-weight);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  line-height: 1.15;
  margin: 0 0 var(--space-4);
}

.page-about .about-team p {
  margin: 0 0 var(--space-4);
  color: rgba(26, 26, 26, 0.82);
}

.page-about .about-team__fig {
  position: relative;
  margin: 0;
}

.page-about .about-team__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  box-shadow: var(--about-shadow);
  border: 1px solid rgba(26, 26, 26, 0.08);
}

.page-about .about-team__fig::after {
  content: "";
  position: absolute;
  right: -10px;
  bottom: -10px;
  width: 100%;
  height: 100%;
  border-right: 3px solid var(--clr-gold);
  border-bottom: 3px solid var(--clr-gold);
  pointer-events: none;
}

.page-about .about-team__list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
}

.page-about .about-team__list li {
  position: relative;
  padding-left: calc(var(--space-4) + 8px);
  margin-bottom: var(--space-3);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: rgba(26, 26, 26, 0.82);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 10px;
  height: 10px;
  background: var(--clr-accent-dark);
  transform: rotate(45deg);
}

/* ---------- 数据与合作（深色面） ---------- */
.page-about .about-data {
  position: relative;
  padding: var(--space-7) 0 var(--space-8);
}

.page-about .about-data::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(720px, 80%);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--clr-accent), transparent);
}

.page-about .about-data .section-label {
  color: var(--clr-accent);
  margin-bottom: var(--space-3);
}

.page-about .about-data h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  font-weight: var(--heading-weight);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  line-height: 1.15;
  margin: 0 0 var(--space-6);
  max-width: 24ch;
}

.page-about .about-data__grid {
  display: grid;
  gap: var(--space-4);
  align-items: start;
}

.page-about .about-data-card {
  position: relative;
  padding: var(--space-5);
  background: var(--about-card-bg);
  border: 1px solid rgba(255, 255, 255, 0.07);
  box-shadow: var(--about-shadow);
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.page-about .about-data-card:nth-child(2) {
  border-top: 3px solid var(--clr-gold);
}

.page-about .about-data-card:hover,
.page-about .about-data-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(0, 255, 157, 0.35);
}

.page-about .about-data-card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: var(--heading-weight);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 var(--space-3);
  color: var(--clr-white);
}

.page-about .about-data-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.74);
}

.page-about .about-data-card__link {
  display: inline-block;
  margin-top: var(--space-4);
  color: var(--clr-accent);
  text-decoration: underline;
  text-decoration-color: rgba(0, 255, 157, 0.35);
  text-underline-offset: 4px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.page-about .about-data-card__link:hover,
.page-about .about-data-card__link:focus-visible {
  color: var(--clr-gold);
  text-decoration-color: var(--clr-gold);
}

/* ---------- 黄鹤楼剪影底饰 ---------- */
.page-about .about-tower {
  position: relative;
  height: 180px;
  overflow: hidden;
  background: var(--clr-bg);
}

.page-about .about-tower__svg {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 180px;
}

/* ---------- 平板：时间轴左右交替 ---------- */
@media (min-width: 820px) {

  .page-about .about-timeline__line {
    left: 50%;
  }

  .page-about .about-milestone-entry {
    width: 50%;
    margin-bottom: var(--space-7);
    padding-left: 0;
  }

  .page-about .about-milestone-entry:nth-child(odd) {
    margin-right: 50%;
    padding-right: var(--space-6);
    text-align: right;
  }

  .page-about .about-milestone-entry:nth-child(even) {
    margin-left: 50%;
    padding-left: var(--space-6);
    text-align: left;
  }

  .page-about .about-milestone-entry__dot {
    left: 50%;
  }

  .page-about .about-milestone-entry:nth-child(odd) .about-milestone-entry__dot {
    left: auto;
    right: 0;
    transform: translate(50%, -50%) rotate(45deg);
  }

  .page-about .about-milestone-entry:nth-child(even) .about-milestone-entry__dot {
    right: auto;
    left: 0;
    transform: translate(-50%, -50%) rotate(45deg);
  }

  .page-about .about-milestone-entry:nth-child(odd) .about-milestone-card::before {
    left: auto;
    right: 0;
  }

  .page-about .about-milestone-feature {
    width: calc(50% - var(--space-6));
    margin-left: calc(50% + var(--space-6));
    max-width: 400px;
  }

  .page-about .about-origins__body {
    grid-template-columns: 3fr 2fr;
    gap: var(--space-7);
    align-items: start;
  }

  .page-about .about-origins__stats {
    grid-template-columns: 1fr;
    gap: var(--space-5);
    padding-left: var(--space-4);
    border-left: 1px solid rgba(0, 196, 140, 0.25);
  }

  .page-about .about-tower {
    height: 260px;
  }
}

/* ---------- 桌面：分屏与栅格调整 ---------- */
@media (min-width: 900px) {

  .page-about .about-hero__grid {
    grid-template-columns: 3fr 2fr;
    gap: var(--space-7);
    align-items: end;
  }

  .page-about .about-hero__lead {
    margin-bottom: var(--space-6);
  }

  .page-about .about-team__inner {
    grid-template-columns: 3fr 2fr;
    gap: var(--space-7);
  }

  .page-about .about-data__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-5);
  }

  .page-about .about-data-card:nth-child(2) {
    margin-top: var(--space-5);
  }
}