.page-about {
  background: var(--c-paper);
  color: var(--c-ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--c-ink);
  color: var(--c-paper);
  padding: clamp(20px, 4vw, 34px) 0 clamp(56px, 8vw, 104px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(246, 239, 227, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(246, 239, 227, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -24%;
  right: -18%;
  width: 340px;
  height: 150%;
  background: linear-gradient(180deg, var(--c-red) 0%, var(--c-red-deep) 100%);
  transform: skewX(-8deg);
  opacity: 0.22;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
}

.page-about .about-hero .crumbs {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(246, 239, 227, 0.62);
  margin-bottom: 22px;
}

.page-about .about-hero .crumbs a {
  color: rgba(246, 239, 227, 0.62);
  text-decoration: none;
}

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

.page-about .about-hero .eyebrow {
  color: var(--c-gold);
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  color: var(--c-white);
  line-height: 1.02;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: rgba(246, 239, 227, 0.82);
}

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

.page-about .hero-stats {
  list-style: none;
  margin: 34px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid rgba(246, 239, 227, 0.18);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 16px;
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .hero-stats__num {
  font-family: var(--font-num);
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1;
  color: var(--c-gold);
}

.page-about .hero-stats__label {
  font-size: 12px;
  letter-spacing: 0.07em;
  color: rgba(246, 239, 227, 0.66);
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid rgba(246, 239, 227, 0.2);
}

.page-about .about-hero__media figcaption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(246, 239, 227, 0.58);
}

/* ---------- 成长线 ---------- */
.page-about .about-growth {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .growth-layout {
  display: grid;
  gap: 28px;
}

.page-about .year-rail {
  border-top: 2px solid var(--c-ink);
  padding-top: 14px;
}

.page-about .year-rail__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-gray);
}

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

.page-about .year-rail__link {
  display: block;
  padding: 5px 8px;
  font-family: var(--font-num);
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--c-gray);
  text-decoration: none;
  border-bottom: 1px solid var(--c-line);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .year-rail__link:hover,
.page-about .year-rail__link:focus-visible {
  color: var(--c-red);
  border-bottom-color: var(--c-red);
}

.page-about .growth-head h2 {
  margin: 10px 0 12px;
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.16;
}

.page-about .growth-head__lead {
  margin: 0;
  max-width: 56ch;
  color: var(--c-gray);
  line-height: 1.85;
}

.page-about .growth-shot {
  margin: 26px 0 0;
}

.page-about .growth-shot img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--c-line);
}

.page-about .timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .tcard {
  position: relative;
  background: var(--c-white);
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-paper);
  padding: 22px 20px 24px 24px;
  scroll-margin-top: 96px;
}

.page-about .tcard::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--c-gold);
}

.page-about .tcard:nth-child(3n+2)::before {
  background: var(--c-red);
}

.page-about .tcard__year {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--c-red);
  border: 1px solid var(--c-red);
  padding: 2px 8px;
  margin-bottom: 12px;
}

.page-about .tcard h3 {
  margin: 0 0 8px;
  font-size: clamp(19px, 2vw, 23px);
  font-weight: 800;
  line-height: 1.3;
}

.page-about .tcard p {
  margin: 0;
  max-width: 60ch;
  color: #3b3b3b;
  line-height: 1.85;
  font-size: 15.5px;
}

/* ---------- 六大体验区 ---------- */
.page-about .about-spaces {
  position: relative;
  background: var(--c-ink);
  color: var(--c-paper);
  padding: clamp(48px, 7vw, 96px) 0;
  overflow: hidden;
}

.page-about .about-spaces .eyebrow {
  color: var(--c-gold);
}

.page-about .spaces-head h2 {
  margin: 10px 0 12px;
  font-size: clamp(26px, 3.4vw, 44px);
  font-weight: 900;
  line-height: 1.16;
  color: var(--c-white);
}

.page-about .spaces-head p {
  margin: 0;
  max-width: 62ch;
  line-height: 1.85;
  color: rgba(246, 239, 227, 0.76);
}

.page-about .flowwrap {
  margin: 30px 0 0;
  padding: 14px;
  border: 1px solid rgba(246, 239, 227, 0.2);
  background: rgba(246, 239, 227, 0.03);
}

.page-about .flowmap {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .flowmap rect {
  fill: rgba(246, 239, 227, 0.05);
  stroke: rgba(246, 239, 227, 0.32);
  stroke-width: 1;
  transition: fill 240ms var(--ease), stroke 240ms var(--ease);
}

.page-about .flowmap__zone {
  cursor: default;
  outline: none;
}

.page-about .flowmap__zone:hover rect,
.page-about .flowmap__zone:focus rect {
  fill: rgba(200, 16, 46, 0.78);
  stroke: var(--c-gold);
}

.page-about .flowmap__zone:focus-visible rect {
  stroke: var(--c-cyan);
  stroke-width: 2;
}

.page-about .flowmap text {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  fill: var(--c-paper);
}

.page-about .flowmap .flowmap__meta {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  fill: var(--c-gold);
}

.page-about .flowmap__arrow {
  fill: none;
  stroke: var(--c-gold);
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
}

.page-about .flowwrap figcaption {
  margin-top: 12px;
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: rgba(246, 239, 227, 0.6);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .team-grid {
  display: grid;
  gap: 28px;
}

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

.page-about .team-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--c-line);
  box-shadow: var(--shadow-paper);
}

.page-about .team-media figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--c-gray);
}

.page-about .team-copy h2 {
  margin: 10px 0 14px;
  font-size: clamp(25px, 3.2vw, 40px);
  font-weight: 900;
  line-height: 1.18;
}

.page-about .team-copy p {
  margin: 0 0 16px;
  max-width: 62ch;
  line-height: 1.88;
  font-size: 15.5px;
  color: #2f2f2f;
}

.page-about .team-facts {
  list-style: none;
  margin: 24px 0;
  padding: 20px 0;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(104px, 1fr));
  gap: 16px;
}

.page-about .team-facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .team-facts .num {
  font-family: var(--font-num);
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1;
  color: var(--c-red);
}

.page-about .team-facts li span:last-child {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--c-gray);
}

/* ---------- 会员档位 ---------- */
.page-about .about-tiers {
  padding: clamp(48px, 7vw, 96px) 0;
  background: var(--c-white);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.page-about .tiers-head h2 {
  margin: 10px 0 12px;
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 900;
  line-height: 1.16;
}

.page-about .tiers-head p {
  margin: 0;
  max-width: 62ch;
  line-height: 1.85;
  color: var(--c-gray);
}

.page-about .tiers__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .tiers__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .tiers__tab {
  cursor: pointer;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--c-line);
  background: var(--c-paper);
  color: var(--c-ink);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  transition: background 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .tiers__tab .num {
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--c-gray);
}

.page-about .tiers__tab:hover {
  border-color: var(--c-red);
  color: var(--c-red);
}

.page-about #tier-1:checked ~ .tiers__tabs [for="tier-1"],
.page-about #tier-2:checked ~ .tiers__tabs [for="tier-2"],
.page-about #tier-3:checked ~ .tiers__tabs [for="tier-3"],
.page-about #tier-4:checked ~ .tiers__tabs [for="tier-4"] {
  background: var(--c-red);
  border-color: var(--c-red);
  color: var(--c-white);
}

.page-about #tier-1:checked ~ .tiers__tabs [for="tier-1"] .num,
.page-about #tier-2:checked ~ .tiers__tabs [for="tier-2"] .num,
.page-about #tier-3:checked ~ .tiers__tabs [for="tier-3"] .num,
.page-about #tier-4:checked ~ .tiers__tabs [for="tier-4"] .num {
  color: var(--c-gold);
}

.page-about #tier-1:focus-visible ~ .tiers__tabs [for="tier-1"],
.page-about #tier-2:focus-visible ~ .tiers__tabs [for="tier-2"],
.page-about #tier-3:focus-visible ~ .tiers__tabs [for="tier-3"],
.page-about #tier-4:focus-visible ~ .tiers__tabs [for="tier-4"] {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

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

.page-about .tier-panel {
  display: none;
  padding: 24px 22px;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-red);
}

.page-about #tier-1:checked ~ .tiers__panels .tier-panel--1,
.page-about #tier-2:checked ~ .tiers__panels .tier-panel--2,
.page-about #tier-3:checked ~ .tiers__panels .tier-panel--3,
.page-about #tier-4:checked ~ .tiers__panels .tier-panel--4 {
  display: block;
}

.page-about .tier-panel h3 {
  margin: 0 0 8px;
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 900;
}

.page-about .tier-panel__fit {
  margin: 0 0 16px;
  font-size: 14px;
  color: var(--c-gray);
  line-height: 1.7;
}

.page-about .tier-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .tier-panel li {
  display: flex;
  gap: 10px;
  line-height: 1.7;
  font-size: 15px;
}

.page-about .tier-panel li::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 8px;
  background: var(--c-gold);
  transform: rotate(45deg);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .eco-head h2 {
  margin: 10px 0 12px;
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 900;
  line-height: 1.16;
}

.page-about .eco-head p {
  margin: 0;
  max-width: 62ch;
  line-height: 1.85;
  color: var(--c-gray);
}

.page-about .eco-tags {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 10px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .eco-tags li {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 15px;
  border: 1px solid var(--c-line);
  background: var(--c-white);
  font-size: 13.5px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.page-about .eco-tags .num {
  font-family: var(--font-num);
  font-size: 18px;
  color: var(--c-red);
}

.page-about .eco-note {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: #2f2f2f;
}

.page-about .eco-note .link-gold {
  margin-left: 2px;
}

/* ---------- 选择理由 ---------- */
.page-about .about-why {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 7vw, 92px) 0;
  background: linear-gradient(135deg, var(--c-red) 0%, var(--c-red-deep) 100%);
  color: var(--c-white);
}

.page-about .about-why::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -8%;
  width: 200px;
  height: 160%;
  background: rgba(245, 183, 0, 0.16);
  transform: skewX(-8deg);
  pointer-events: none;
}

.page-about .about-why .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-why .eyebrow {
  color: var(--c-gold);
}

.page-about .why-head h2 {
  margin: 10px 0 0;
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 900;
  line-height: 1.16;
  color: var(--c-white);
}

.page-about .why-stats {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.page-about .why-stats li {
  border-top: 1px solid rgba(255, 253, 248, 0.38);
  padding-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .why-stats .num {
  font-family: var(--font-num);
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1;
  color: var(--c-white);
}

.page-about .why-stats__label {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: rgba(255, 253, 248, 0.82);
}

.page-about .why-certs {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .why-certs li {
  display: flex;
  gap: 10px;
  line-height: 1.7;
  font-size: 15px;
  color: rgba(255, 253, 248, 0.94);
}

.page-about .why-certs li::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  margin-top: 7px;
  background: var(--c-gold);
  transform: rotate(45deg);
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  padding: clamp(48px, 7vw, 88px) 0;
  background: var(--c-paper);
}

.page-about .cta-grid {
  display: grid;
  gap: 26px;
}

.page-about .about-cta h2 {
  margin: 10px 0 14px;
  font-size: clamp(25px, 3.2vw, 40px);
  font-weight: 900;
  line-height: 1.16;
}

.page-about .cta-copy {
  margin: 0;
  max-width: 60ch;
  line-height: 1.9;
  font-size: 15.5px;
  color: #2f2f2f;
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .timeline {
    gap: 22px;
  }

  .page-about .tcard:nth-child(odd) {
    margin-right: 42px;
  }

  .page-about .tcard:nth-child(even) {
    margin-left: 42px;
  }

  .page-about .why-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .why-certs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: end;
    gap: 52px;
  }

  .page-about .growth-layout {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 52px;
  }

  .page-about .year-rail {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .year-rail__list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .year-rail__link {
    padding: 8px 2px;
    font-size: 19px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .cta-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: center;
    gap: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}