.page-about {
  --about-blue: var(--deep-space-blue);
  --about-cream: var(--cream);
  --about-ink: var(--dark-brown);
  --about-red: var(--passion-red);
  --about-gold: var(--gold);
  --about-mist: var(--blue-mist);
  --about-orange: var(--orange-red);
  background: var(--about-cream);
  color: var(--about-ink);
  overflow-x: hidden;
  font-family: var(--font-body);
}

.page-about .section-head {
  margin-bottom: 30px;
}

.page-about .section-head .index-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--about-red);
  text-transform: uppercase;
}

.page-about .section-head .index-label::after {
  content: "";
  width: 32px;
  height: 2px;
  background: linear-gradient(90deg, var(--about-red), var(--about-gold));
  border-radius: 2px;
}

.page-about .section-head h2 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--about-blue);
}

.page-about .media-frame {
  margin: 0;
}

.page-about .media-frame img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.page-about .media-frame figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray-blue);
  text-align: center;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  background: var(--about-blue);
  color: var(--about-cream);
  padding: 36px 0 72px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), 0 100%);
}

.page-about .about-hero__shell {
  position: relative;
  z-index: 2;
}

.page-about .about-hero .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 40px;
  font-size: 13px;
  color: rgba(255, 249, 239, 0.6);
}

.page-about .about-hero .breadcrumbs a {
  color: rgba(255, 249, 239, 0.85);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .about-hero .breadcrumbs a:hover,
.page-about .about-hero .breadcrumbs a:focus-visible {
  color: var(--about-gold);
}

.page-about .breadcrumbs__sep {
  opacity: 0.5;
}

.page-about .about-hero__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--about-gold);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--about-cream);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 560px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 249, 239, 0.78);
}

.page-about .about-hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__badges li {
  border: 1px solid rgba(255, 249, 239, 0.35);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--about-cream);
  background: rgba(255, 249, 239, 0.04);
}

.page-about .about-hero__badges li:nth-child(2) {
  border-color: rgba(212, 175, 55, 0.6);
  color: var(--about-gold);
}

.page-about .about-hero__shape {
  position: absolute;
  right: -70px;
  bottom: -40px;
  width: 220px;
  height: 220px;
  background: linear-gradient(135deg, var(--about-red), var(--about-orange));
  clip-path: polygon(18% 0, 100% 0, 100% 82%, 0 100%);
  opacity: 0.9;
  z-index: 1;
}

.page-about .about-hero__glow {
  position: absolute;
  top: -120px;
  left: 50%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.18) 0%, rgba(10, 25, 47, 0) 70%);
  pointer-events: none;
}

/* ===== 01 我们是谁 ===== */
.page-about .about-mission {
  padding: 56px 0 64px;
}

.page-about .about-mission__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

.page-about .about-mission__copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink);
}

.page-about .about-mission__strong {
  color: var(--about-red);
  font-weight: 700;
}

.page-about .about-mission__keyword {
  font-style: normal;
  font-weight: 700;
  color: var(--about-blue);
  background: linear-gradient(transparent 60%, rgba(212, 175, 55, 0.35) 60%);
}

.page-about .about-mission__values {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid rgba(74, 100, 145, 0.18);
}

.page-about .about-mission__values li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 500;
}

.page-about .about-mission__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 10px;
  background: var(--about-blue);
  color: var(--about-cream);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
}

.page-about .about-mission__media img {
  border-radius: var(--radius-lg);
}

/* ===== 02 发展里程碑 ===== */
.page-about .about-timeline {
  padding: 56px 0 72px;
  background: var(--off-white);
  border-top: 1px solid rgba(74, 100, 145, 0.12);
  border-bottom: 1px solid rgba(74, 100, 145, 0.12);
}

.page-about .about-timeline__intro,
.page-about .about-coverage__intro,
.page-about .about-experts__intro,
.page-about .about-membership__intro {
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray-blue);
  margin: 0;
}

.page-about .about-timeline__curve {
  width: 100%;
  height: 70px;
  margin: 0 0 8px;
  display: block;
}

.page-about .about-timeline__tree {
  position: relative;
  margin-top: 12px;
}

.page-about .about-timeline__rail {
  position: absolute;
  left: 34px;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--about-red), var(--about-gold), var(--about-blue));
  border-radius: 2px;
  opacity: 0.3;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 18px;
  align-items: start;
  padding: 20px 0;
}

.page-about .about-timeline__node {
  grid-column: 1;
  grid-row: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: var(--about-blue);
  color: var(--about-cream);
  text-decoration: none;
  box-shadow: 0 0 0 4px var(--off-white), 0 0 0 5px var(--about-blue);
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
  z-index: 2;
}

.page-about .about-timeline__node:hover,
.page-about .about-timeline__node:focus-visible {
  transform: scale(1.07);
  background: var(--about-red);
  box-shadow: 0 0 0 4px var(--off-white), 0 0 0 5px var(--about-red);
}

.page-about .about-timeline__version {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-about .about-timeline__card {
  grid-column: 2;
  grid-row: 1;
  background: var(--about-cream);
  border: 1px solid rgba(74, 100, 145, 0.16);
  border-radius: var(--radius);
  padding: 18px 18px 14px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.page-about .about-timeline__card:target {
  border-color: var(--about-red);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.22), var(--shadow-card);
}

.page-about .about-timeline__card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 34px rgba(10, 25, 47, 0.1);
}

.page-about .about-timeline__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--about-blue);
}

.page-about .about-timeline__card p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink);
}

.page-about .about-timeline__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.page-about .about-timeline__list li {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray-blue);
}

.page-about .about-timeline__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--about-red), var(--about-gold));
}

/* ===== 03 内容覆盖 ===== */
.page-about .about-coverage {
  position: relative;
  padding: 56px 0 64px;
  background: var(--about-cream);
}

.page-about .about-coverage__stripe {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 8px;
  background: linear-gradient(180deg, var(--about-red), var(--about-gold), var(--about-blue));
}

.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-about .about-coverage__leagues {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-coverage__card {
  position: relative;
  background: var(--about-blue);
  color: var(--about-cream);
  border-radius: var(--radius);
  padding: 22px;
  overflow: hidden;
}

.page-about .about-coverage__card::after {
  content: "";
  position: absolute;
  right: -28px;
  bottom: -28px;
  width: 90px;
  height: 90px;
  background: linear-gradient(135deg, var(--about-red), var(--about-orange));
  clip-path: polygon(40% 0, 100% 0, 100% 60%, 0 100%);
  opacity: 0.7;
}

.page-about .about-coverage__card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--about-gold);
}

.page-about .about-coverage__card p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 249, 239, 0.78);
}

.page-about .about-coverage__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-coverage__tags li {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(255, 249, 239, 0.1);
  color: var(--about-cream);
  border: 1px solid rgba(255, 249, 239, 0.16);
}

.page-about .about-coverage__metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.page-about .about-coverage__metric {
  background: rgba(74, 100, 145, 0.07);
  border: 1px solid rgba(74, 100, 145, 0.14);
  border-radius: var(--radius-sm);
  padding: 16px 12px;
  text-align: center;
}

.page-about .about-coverage__number {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--about-red);
}

.page-about .about-coverage__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--gray-blue);
}

.page-about .about-coverage__media img {
  border-radius: var(--radius-lg);
}

.page-about .about-coverage__action {
  margin-top: 28px;
  text-align: center;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.page-about .btn-primary {
  background: var(--about-red);
  color: var(--about-cream);
}

.page-about .btn-primary:hover,
.page-about .btn-primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(230, 57, 70, 0.35);
}

.page-about .btn-ghost {
  border: 1px solid var(--about-blue);
  color: var(--about-blue);
  background: transparent;
}

.page-about .btn-ghost:hover,
.page-about .btn-ghost:focus-visible {
  background: var(--about-blue);
  color: var(--about-cream);
  transform: translateY(-2px);
}

/* ===== 04 专家团队 ===== */
.page-about .about-experts {
  padding: 56px 0 64px;
  background: var(--off-white);
  border-top: 1px solid rgba(74, 100, 145, 0.12);
  border-bottom: 1px solid rgba(74, 100, 145, 0.12);
}

.page-about .about-experts__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-experts__card {
  position: relative;
  background: var(--about-cream);
  border-radius: var(--radius);
  padding: 22px 22px 18px;
  box-shadow: var(--shadow-card);
  border-top: 4px solid var(--about-red);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-experts__card:nth-child(2) {
  border-top-color: var(--about-gold);
}

.page-about .about-experts__card:nth-child(3) {
  border-top-color: var(--about-orange);
}

.page-about .about-experts__card:nth-child(4) {
  border-top-color: var(--about-mist);
}

.page-about .about-experts__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(10, 25, 47, 0.12);
}

.page-about .about-experts__role {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--about-red);
  margin-bottom: 8px;
}

.page-about .about-experts__card:nth-child(2) .about-experts__role {
  color: var(--about-gold);
}

.page-about .about-experts__card:nth-child(3) .about-experts__role {
  color: var(--about-orange);
}

.page-about .about-experts__card:nth-child(4) .about-experts__role {
  color: var(--about-mist);
}

.page-about .about-experts__card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--about-blue);
}

.page-about .about-experts__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink);
}

.page-about .about-experts__note {
  margin: 28px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--gray-blue);
  text-align: center;
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== 05 会员权益 ===== */
.page-about .about-membership {
  position: relative;
  padding: 56px 0 72px;
  background: var(--about-blue);
  color: var(--about-cream);
  overflow: hidden;
}

.page-about .about-membership__shape {
  position: absolute;
  right: -90px;
  top: -70px;
  width: 260px;
  height: 260px;
  background: linear-gradient(135deg, var(--about-red), var(--about-orange));
  clip-path: polygon(20% 0, 100% 0, 100% 80%, 0 100%);
  opacity: 0.45;
}

.page-about .about-membership .section-head h2 {
  color: var(--about-cream);
}

.page-about .about-membership .section-head .index-label {
  color: var(--about-gold);
}

.page-about .about-membership__intro {
  color: rgba(255, 249, 239, 0.65);
}

.page-about .about-membership__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
  margin-top: 28px;
}

.page-about .about-membership__levels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-membership__level {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 14px;
  align-items: center;
  background: rgba(255, 249, 239, 0.05);
  border: 1px solid rgba(255, 249, 239, 0.14);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-membership__level:hover,
.page-about .about-membership__level:focus-within {
  background: rgba(255, 249, 239, 0.09);
  border-color: rgba(212, 175, 55, 0.55);
  transform: translateX(4px);
}

.page-about .about-membership__tier {
  grid-column: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--about-red);
  color: var(--about-cream);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

.page-about .about-membership__level:nth-child(2) .about-membership__tier {
  background: var(--about-mist);
}

.page-about .about-membership__level:nth-child(3) .about-membership__tier {
  background: var(--about-gold);
  color: var(--about-blue);
}

.page-about .about-membership__level:nth-child(4) .about-membership__tier {
  background: linear-gradient(135deg, var(--about-red), var(--about-gold));
}

.page-about .about-membership__level h3 {
  grid-column: 2;
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--about-cream);
}

.page-about .about-membership__level p {
  grid-column: 2;
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 249, 239, 0.62);
}

.page-about .about-membership__media img {
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.25);
}

.page-about .about-membership .media-frame figcaption {
  color: rgba(255, 249, 239, 0.6);
}

.page-about .about-membership__cta {
  margin-top: 36px;
  text-align: center;
  border-top: 1px solid rgba(255, 249, 239, 0.14);
  padding-top: 30px;
}

.page-about .about-membership__cta p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 249, 239, 0.8);
}

.page-about .about-membership__cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.page-about .about-membership .btn-primary {
  background: var(--about-red);
  color: var(--about-cream);
}

.page-about .about-membership .btn-primary:hover,
.page-about .about-membership .btn-primary:focus-visible {
  box-shadow: 0 8px 28px rgba(230, 57, 70, 0.4);
  transform: translateY(-2px);
}

.page-about .about-membership .btn-ghost {
  border-color: rgba(255, 249, 239, 0.6);
  color: var(--about-cream);
}

.page-about .about-membership .btn-ghost:hover,
.page-about .about-membership .btn-ghost:focus-visible {
  background: var(--about-cream);
  color: var(--about-blue);
  transform: translateY(-2px);
  border-color: var(--about-cream);
}

/* ===== 平板及以上 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 56px 0 110px;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 64px), 0 100%);
  }

  .page-about .about-hero h1 {
    font-size: 44px;
  }

  .page-about .about-hero__lead {
    font-size: 16px;
    max-width: 620px;
  }

  .page-about .about-hero__shape {
    width: 320px;
    height: 320px;
    right: -60px;
    bottom: -60px;
  }

  .page-about .about-mission,
  .page-about .about-timeline,
  .page-about .about-coverage,
  .page-about .about-experts,
  .page-about .about-membership {
    padding: 80px 0 96px;
  }

  .page-about .section-head {
    margin-bottom: 44px;
  }

  .page-about .section-head h2 {
    font-size: 34px;
  }

  .page-about .about-mission__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-mission__media img {
    border-radius: var(--radius-lg);
  }

  .page-about .about-timeline__intro {
    max-width: 520px;
  }

  .page-about .about-timeline__curve {
    height: 90px;
  }

  .page-about .about-timeline__tree {
    margin-top: 20px;
  }

  .page-about .about-timeline__rail {
    left: 50%;
    transform: translateX(-2px);
  }

  .page-about .about-timeline__item {
    grid-template-columns: 1fr 108px 1fr;
    gap: 28px;
    align-items: center;
    padding: 30px 0;
  }

  .page-about .about-timeline__node {
    grid-column: 2;
    grid-row: 1;
    width: 84px;
    height: 84px;
    box-shadow: 0 0 0 6px var(--off-white), 0 0 0 7px var(--about-blue);
  }

  .page-about .about-timeline__node:hover,
  .page-about .about-timeline__node:focus-visible {
    box-shadow: 0 0 0 6px var(--off-white), 0 0 0 7px var(--about-red);
  }

  .page-about .about-timeline__version {
    font-size: 17px;
  }

  .page-about .about-timeline__card {
    grid-column: 1;
    grid-row: 1;
    padding: 24px 24px 18px;
    border-radius: var(--radius-lg);
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__card {
    grid-column: 3;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__card {
    grid-column: 1;
  }

  .page-about .about-timeline__card h3 {
    font-size: 19px;
  }

  .page-about .about-timeline__card p {
    font-size: 14px;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .page-about .about-coverage__leagues {
    gap: 24px;
  }

  .page-about .about-coverage__card {
    padding: 28px;
  }

  .page-about .about-coverage__metrics {
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
  }

  .page-about .about-coverage__number {
    font-size: 28px;
  }

  .page-about .about-coverage__media {
    grid-column: 1 / -1;
    max-width: 760px;
    margin-left: auto;
    margin-right: auto;
  }

  .page-about .about-experts__grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .page-about .about-experts__card {
    padding: 26px 24px 22px;
  }

  .page-about .about-membership__grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

  .page-about .about-membership__levels {
    gap: 16px;
  }

  .page-about .about-membership__level {
    padding: 16px 18px;
  }

  .page-about .about-membership__level:hover,
  .page-about .about-membership__level:focus-within {
    transform: translateY(-2px) translateX(4px);
  }
}

/* ===== 大屏 ===== */
@media (min-width: 1200px) {
  .page-about .about-experts__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-coverage__grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .page-about .about-coverage__metrics {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-coverage__media {
    grid-column: 1 / -1;
  }
}