.page-about {
  position: relative;
  --about-accent-deep: rgba(57, 255, 136, 0.18);
  --about-orange-deep: rgba(255, 107, 53, 0.16);
}

.page-about .page-about__hero {
  position: relative;
  overflow: hidden;
  background-color: var(--color-primary);
  background-image:
    linear-gradient(rgba(57, 255, 136, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 136, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  padding: 36px 0 52px;
}

.page-about .page-about__hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -120px;
  width: 440px;
  height: 440px;
  background: linear-gradient(135deg, transparent 30%, rgba(57, 255, 136, 0.14) 100%);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.page-about .page-about__hero::after {
  content: "";
  position: absolute;
  left: -70px;
  bottom: -120px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.16) 0%, transparent 70%);
}

.page-about .page-about__hero-glow {
  position: absolute;
  top: 20%;
  left: 46%;
  width: 120px;
  height: 120px;
  background: rgba(200, 255, 0, 0.08);
  filter: blur(48px);
  pointer-events: none;
}

.page-about .page-about__hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .page-about__crumb-sep {
  margin: 0 8px;
  color: rgba(237, 242, 247, 0.6);
  font-size: 13px;
}

.page-about .page-about__hero-grid {
  display: grid;
  gap: 32px;
  margin-top: 36px;
}

.page-about .page-about__hero-copy {
  max-width: 640px;
}

.page-about .page-about__hero-copy h1 {
  margin: 10px 0 16px;
  font-family: var(--font-heading);
  font-size: clamp(32px, 5vw, 46px);
  line-height: 1.15;
  color: #ffffff;
  letter-spacing: 0.01em;
}

.page-about .page-about__hero-copy .page-header__desc {
  margin: 0;
  color: rgba(237, 242, 247, 0.85);
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.65;
}

.page-about .page-about__hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 0;
  padding: 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(57, 255, 136, 0.22);
  border-radius: var(--radius);
  backdrop-filter: blur(6px);
}

.page-about .page-about__hero-stat {
  min-width: 0;
}

.page-about .page-about__hero-stat dt {
  margin-bottom: 6px;
  color: rgba(237, 242, 247, 0.7);
  font-size: 12px;
}

.page-about .page-about__hero-stat dd {
  margin: 0;
}

.page-about .page-about__hero-stat .data-num {
  font-size: clamp(22px, 3vw, 32px);
}

.page-about .page-about__story {
  background: linear-gradient(160deg, var(--color-bg-light) 0%, #ffffff 72%);
  overflow: hidden;
}

.page-about .page-about__story-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about .page-about__story-copy h2,
.page-about .page-about__milestones .section-heading h2,
.page-about .page-about__team .section-heading h2,
.page-about .page-about__architecture .section-heading h2,
.page-about .page-about__coverage .section-heading h2,
.page-about .page-about__credentials .section-heading h2,
.page-about .page-about__connect-card h2 {
  margin: 12px 0 16px;
  font-family: var(--font-heading);
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.25;
  color: var(--color-text);
}

.page-about .page-about__story-copy .page-about__lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--color-text);
}

.page-about .page-about__story-copy > p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 16px 0;
}

.page-about .page-about__story-features {
  margin: 24px 0;
}

.page-about .page-about__story-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

.page-about .page-about__story-figure::before {
  content: "";
  position: absolute;
  top: -16px;
  right: -16px;
  width: 80%;
  height: 80%;
  background: linear-gradient(135deg, var(--about-accent-deep) 0%, transparent 70%);
  border-radius: var(--radius);
  z-index: 0;
}

.page-about .page-about__story-figure img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  max-width: 500px;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lift);
  transform: rotate(1.2deg);
}

.page-about .page-about__story-figure figcaption {
  position: relative;
  z-index: 1;
  margin-top: 10px;
  color: var(--color-text-secondary);
  font-size: 13px;
}

.page-about .page-about__milestones {
  background-color: var(--color-primary);
  background-image:
    linear-gradient(rgba(57, 255, 136, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 136, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  position: relative;
}

.page-about .page-about__milestones::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(180deg, transparent, rgba(11, 27, 59, 0.9));
}

.page-about .page-about__milestones .container {
  position: relative;
  z-index: 1;
}

.page-about .page-about__milestones .section-heading h2 {
  color: #ffffff;
}

.page-about .page-about__milestones .section-heading__desc {
  color: rgba(237, 242, 247, 0.68);
}

.page-about .page-about__milestone-layout {
  display: grid;
  gap: 28px;
  margin-top: 40px;
}

.page-about .page-about__timeline {
  position: relative;
  padding-left: 30px;
}

.page-about .page-about__timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-primary-light) 40%, rgba(27, 58, 107, 0.4) 100%);
}

.page-about .page-about__milestone {
  position: relative;
  margin-bottom: 22px;
  opacity: 1;
}

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

.page-about .page-about__milestone-node {
  position: absolute;
  left: -27px;
  top: 24px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(57, 255, 136, 0.2), 0 0 0 8px rgba(57, 255, 136, 0.06);
}

.page-about .page-about__milestone.is-revealed .page-about__milestone-node {
  background: var(--color-highlight);
  box-shadow: 0 0 0 6px var(--about-accent-deep), 0 0 26px rgba(57, 255, 136, 0.55);
}

.page-about .page-about__milestone-card {
  padding: 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(57, 255, 136, 0.12);
  border-radius: var(--radius);
  border-top: 3px solid rgba(57, 255, 136, 0.8);
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base);
}

.page-about .page-about__milestone-card:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(57, 255, 136, 0.35);
}

.page-about .page-about__milestone:nth-child(2) .page-about__milestone-card {
  border-top-color: var(--color-accent-warm);
}

.page-about .page-about__milestone:nth-child(3) .page-about__milestone-card {
  border-top-color: var(--color-highlight);
}

.page-about .page-about__milestone:nth-child(4) .page-about__milestone-card {
  border-top-color: var(--color-accent-deep);
}

.page-about .page-about__milestone-round {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.page-about .page-about__milestone-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 19px;
  color: #ffffff;
  line-height: 1.3;
}

.page-about .page-about__milestone-card p {
  margin: 0 0 16px;
  color: rgba(237, 242, 247, 0.72);
  font-size: 14px;
  line-height: 1.65;
}

.page-about .page-about__milestone-card .tag-badge {
  background: rgba(57, 255, 136, 0.12);
  color: var(--color-accent);
}

.page-about .page-about__milestone-card .tag-badge--warm {
  background: rgba(255, 107, 53, 0.16);
  color: #ffa28a;
}

.page-about .page-about__milestone-figure {
  margin: 0;
  align-self: start;
}

.page-about .page-about__milestone-figure img {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
  object-fit: cover;
}

.page-about .page-about__milestone-figure figcaption {
  margin-top: 10px;
  color: rgba(237, 242, 247, 0.55);
  font-size: 13px;
}

.page-about .page-about__team {
  background: linear-gradient(165deg, #ffffff 0%, #f9fbfc 100%);
  position: relative;
  overflow: hidden;
}

.page-about .page-about__team::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 260px;
  height: 260px;
  background: linear-gradient(135deg, transparent 30%, rgba(57, 255, 136, 0.12) 100%);
}

.page-about .page-about__team .container {
  position: relative;
  z-index: 1;
}

.page-about .page-about__team-grid {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.page-about .page-about__team-card {
  background: #ffffff;
  border: 1px solid rgba(198, 246, 213, 0.7);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
}

.page-about .page-about__team-card::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, transparent 50%, var(--about-accent-deep) 50%);
  border-bottom-left-radius: 12px;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.page-about .page-about__team-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lift);
  border-color: rgba(57, 255, 136, 0.55);
}

.page-about .page-about__team-card:hover::after {
  opacity: 1;
}

.page-about .page-about__team-card--featured {
  background: linear-gradient(145deg, var(--color-primary) 0%, var(--color-primary-mid) 100%);
  border-color: transparent;
}

.page-about .page-about__team-card--featured h3,
.page-about .page-about__team-card--featured p {
  color: rgba(237, 242, 247, 0.85);
}

.page-about .page-about__team-card--featured .page-about__team-role {
  color: var(--color-accent);
}

.page-about .page-about__team-glyph {
  margin-bottom: 18px;
}

.page-about .page-about__team-role {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-deep);
  font-weight: 700;
  margin-bottom: 10px;
}

.page-about .page-about__team-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 18px;
  line-height: 1.35;
  color: var(--color-text);
}

.page-about .page-about__team-card p {
  margin: 0 0 16px;
  color: var(--color-text-secondary);
  font-size: 14px;
  line-height: 1.65;
}

.page-about .page-about__team-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.page-about .page-about__team-card--featured .tag-badge {
  background: rgba(57, 255, 136, 0.14);
  color: var(--color-accent);
}

.page-about .page-about__team-work {
  margin: 40px 0 0;
}

.page-about .page-about__team-work img {
  display: block;
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--radius);
  object-fit: cover;
  box-shadow: var(--shadow-card);
}

.page-about .page-about__team-work figcaption {
  margin-top: 10px;
  color: var(--color-text-secondary);
  font-size: 13px;
}

.page-about .page-about__architecture {
  background-color: var(--color-primary);
  background-image: linear-gradient(135deg, rgba(27, 58, 107, 0.7) 0%, transparent 50%), linear-gradient(120deg, transparent 30%, rgba(255, 107, 53, 0.16) 100%);
  position: relative;
}

.page-about .page-about__architecture .section-heading h2 {
  color: #ffffff;
}

.page-about .page-about__architecture .section-heading__desc {
  color: rgba(237, 242, 247, 0.68);
}

.page-about .page-about__arch-grid {
  display: grid;
  gap: 16px;
  margin-top: 36px;
}

.page-about .page-about__arch-node {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(57, 255, 136, 0.18);
  border-radius: var(--radius);
  padding: 24px 20px;
  position: relative;
  transition: transform var(--transition-base), background-color var(--transition-base);
}

.page-about .page-about__arch-node:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.09);
}

.page-about .page-about__arch-index {
  position: absolute;
  top: 18px;
  right: 18px;
  font-family: var(--font-heading);
  font-size: 30px;
  color: rgba(57, 255, 136, 0.16);
  line-height: 1;
}

.page-about .page-about__arch-node h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 19px;
  color: #ffffff;
}

.page-about .page-about__arch-node p {
  margin: 0;
  color: rgba(237, 242, 247, 0.72);
  font-size: 14px;
  line-height: 1.65;
}

.page-about .page-about__arch-note {
  margin-top: 28px;
  padding: 20px 24px;
  background: rgba(255, 107, 53, 0.1);
  border-left: 4px solid var(--color-accent-warm);
  border-radius: 0 var(--radius) var(--radius) 0;
  max-width: 760px;
}

.page-about .page-about__arch-note p {
  margin: 0;
  color: rgba(237, 242, 247, 0.85);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .page-about__arch-note strong {
  color: var(--color-accent);
}

.page-about .page-about__coverage {
  background: linear-gradient(170deg, var(--color-bg-light) 0%, #ffffff 80%);
}

.page-about .page-about__coverage-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about .page-about__coverage-copy h2 {
  color: var(--color-text);
}

.page-about .page-about__coverage-copy > p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 16px 0;
}

.page-about .page-about__coverage-list {
  margin: 24px 0;
}

.page-about .page-about__coverage-list .feature-list__item {
  padding: 10px 0;
}

.page-about .page-about__coverage-tip {
  padding: 16px 18px;
  background: rgba(57, 255, 136, 0.08);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 13px;
  line-height: 1.6;
}

.page-about .page-about__coverage-visual {
  min-width: 0;
}

.page-about .page-about__coverage-map svg {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lift);
}

.page-about .page-about__coverage-caption {
  margin: 12px 0 0;
  color: var(--color-text-secondary);
  font-size: 13px;
}

.page-about .page-about__credentials {
  background: linear-gradient(160deg, #ffffff 0%, #f7faf8 100%);
}

.page-about .page-about__credential-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .page-about__credential {
  background: #ffffff;
  border: 1px solid rgba(198, 246, 213, 0.9);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.page-about .page-about__credential:hover {
  border-color: rgba(57, 255, 136, 0.5);
  box-shadow: var(--shadow-lift);
}

.page-about .page-about__credential summary {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 24px 24px;
  cursor: pointer;
  list-style: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.page-about .page-about__credential summary::-webkit-details-marker {
  display: none;
}

.page-about .page-about__credential summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-heading);
  font-size: 24px;
  color: var(--color-accent-deep);
  line-height: 1;
  transition: transform var(--transition-fast);
}

.page-about .page-about__credential[open] summary::after {
  transform: rotate(45deg);
}

.page-about .page-about__credential-icon {
  flex: 0 0 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .page-about__credential-copy {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .page-about__credential-copy strong {
  font-family: var(--font-heading);
  font-size: 16px;
  color: var(--color-text);
  line-height: 1.4;
}

.page-about .page-about__credential-copy small {
  color: var(--color-text-secondary);
  font-size: 12px;
}

.page-about .page-about__credential-detail {
  padding: 0 24px 24px 90px;
  color: var(--color-text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .page-about__credential-detail p {
  margin: 0;
}

.page-about .page-about__connect {
  background-color: var(--color-primary-mid);
  position: relative;
  overflow: hidden;
}

.page-about .page-about__connect::before {
  content: "";
  position: absolute;
  top: 0;
  left: -80px;
  bottom: 0;
  width: 400px;
  background: linear-gradient(120deg, rgba(57, 255, 136, 0.18) 0%, transparent 100%);
  clip-path: polygon(0 0, 70% 0, 100% 100%, 0 100%);
}

.page-about .page-about__connect-card {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
  padding: 36px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(57, 255, 136, 0.2);
  border-radius: var(--radius);
}

.page-about .page-about__connect-copy h2 {
  color: #ffffff;
  margin-top: 8px;
}

.page-about .page-about__connect-copy p {
  color: rgba(237, 242, 247, 0.74);
  line-height: 1.65;
  margin: 0;
}

.page-about .page-about__connect-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

@media (min-width: 720px) {
  .page-about .page-about__hero {
    padding-top: 44px;
    padding-bottom: 64px;
  }

  .page-about .page-about__hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: end;
    gap: 40px;
  }

  .page-about .page-about__story-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 52px;
  }

  .page-about .page-about__milestone-layout {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

  .page-about .page-about__milestone-figure {
    position: sticky;
    top: 120px;
    text-align: right;
  }

  .page-about .page-about__team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .page-about__arch-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .page-about__coverage-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .page-about__connect-card {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .page-about .page-about__connect-actions {
    justify-content: flex-end;
    min-width: 320px;
  }
}

@media (min-width: 1024px) {
  .page-about::before {
    content: "必一体育 · 品牌档案 · SINCE 2016";
    position: fixed;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    writing-mode: vertical-rl;
    color: rgba(57, 255, 136, 0.45);
    font-family: var(--font-heading);
    font-size: 11px;
    letter-spacing: 0.42em;
    white-space: nowrap;
    z-index: 40;
    pointer-events: none;
  }

  .page-about .page-about__hero-stats {
    padding: 24px;
    gap: 20px;
  }

  .page-about .page-about__story-grid {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 72px;
  }

  .page-about .page-about__team-grid {
    grid-template-columns: repeat(12, 1fr);
    gap: 24px;
    margin-top: 44px;
  }

  .page-about .page-about__team-card--featured {
    grid-column: 1 / 7;
    grid-row: 1;
  }

  .page-about .page-about__team-card:nth-of-type(2) {
    grid-column: 8 / 13;
    grid-row: 1;
    align-self: center;
    transform: translateY(36px);
  }

  .page-about .page-about__team-card:nth-of-type(3) {
    grid-column: 1 / 6;
    grid-row: 2;
    align-self: end;
    transform: translateY(24px);
  }

  .page-about .page-about__team-card:nth-of-type(4) {
    grid-column: 7 / 13;
    grid-row: 2;
    align-self: start;
    transform: translateY(56px);
  }

  .page-about .page-about__team-card--featured:hover,
  .page-about .page-about__team-card:nth-of-type(2):hover,
  .page-about .page-about__team-card:nth-of-type(3):hover,
  .page-about .page-about__team-card:nth-of-type(4):hover {
    transform: translateY(-3px);
  }

  .page-about .page-about__team-card:nth-of-type(2):hover {
    transform: translateY(32px);
  }

  .page-about .page-about__team-card:nth-of-type(3):hover {
    transform: translateY(20px);
  }

  .page-about .page-about__team-card:nth-of-type(4):hover {
    transform: translateY(52px);
  }

  .page-about .page-about__team-work {
    margin-top: 96px;
    text-align: center;
  }

  .page-about .page-about__team-work img {
    margin: 0 auto;
  }

  .page-about .page-about__arch-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    margin-left: -12px;
    margin-right: -12px;
  }

  .page-about .page-about__arch-node {
    margin: 0 12px;
    position: relative;
  }

  .page-about .page-about__arch-node:not(:last-child)::after {
    content: "\2192";
    position: absolute;
    right: -24px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-heading);
    font-size: 18px;
    color: rgba(57, 255, 136, 0.5);
    z-index: 2;
    pointer-events: none;
  }

  .page-about .page-about__arch-note {
    margin-top: 40px;
  }

  .page-about .page-about__credential-grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }

  .page-about .page-about__credential summary {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 28px 24px 32px;
  }

  .page-about .page-about__credential summary::after {
    position: absolute;
    top: 24px;
    right: 20px;
    margin-left: 0;
  }

  .page-about .page-about__credential-detail {
    padding: 0 24px 28px;
  }
}