.page-about {
  background: var(--ink);
  color: var(--paper);
  --tl-pad: 30px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  margin: 0 0 clamp(18px, 3vw, 28px);
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 0.5em;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  color: var(--mist);
  opacity: 0.6;
}

.page-about .breadcrumbs a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease-out);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  border-bottom-color: var(--lava);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(26px, 5vw, 56px) clamp(46px, 7vw, 96px);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(255, 91, 45, 0.2), transparent 62%),
    radial-gradient(95% 80% at 96% 18%, rgba(51, 224, 208, 0.14), transparent 66%),
    var(--ink-deep);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--flag-blue), var(--flag-yellow) 22%, var(--flag-red) 44%, var(--flag-green) 66%, var(--flag-white) 100%);
  opacity: 0.8;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 7.2vw, 4.3rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__text {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  max-width: 40em;
  font-size: clamp(0.98rem, 0.94rem + 0.28vw, 1.1rem);
  line-height: 1.8;
  color: rgba(247, 241, 230, 0.86);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 13px 15px;
  background: var(--ink-deep);
}

.page-about .about-facts .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.6vw, 1.85rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-facts li:nth-child(2n) .num {
  color: var(--lava);
}

.page-about .about-facts__label {
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 章节导读 ---------- */
.page-about .about-index {
  padding: clamp(16px, 3vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(247, 241, 230, 0.05);
  backdrop-filter: blur(8px);
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-index ol {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 2px;
  border-bottom: 1px dashed var(--line);
  color: var(--paper);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.2s var(--ease-out);
}

.page-about .about-index li:last-child a {
  border-bottom: 0;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--lava-soft);
}

.page-about .about-index .num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-block: clamp(42px, 7vw, 88px);
  border-top: 1px solid var(--line);
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2.6vw, 26px);
  align-items: start;
  margin-bottom: clamp(20px, 3.5vw, 34px);
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 6vw, 3.4rem);
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--lava);
}

.page-about .accent-cyan .about-chapter__num {
  color: var(--cyan);
}

.page-about .about-chapter__kicker {
  margin: 0 0 6px;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 4.6vw, 2.45rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-about .about-text {
  max-width: 40em;
  font-size: clamp(0.96rem, 0.93rem + 0.22vw, 1.06rem);
  line-height: 1.85;
  color: rgba(247, 241, 230, 0.84);
}

.page-about .about-text p {
  margin: 0 0 1em;
}

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

.page-about .about-text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-text a:hover {
  color: var(--lava-soft);
}

/* ---------- 图片 ---------- */
.page-about .media {
  margin: 0;
}

.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-about .media--frame .media__img {
  border: 1px solid var(--line-strong);
  box-shadow: 0 18px 40px rgba(8, 11, 18, 0.55);
}

.page-about .media--16x9 .media__img {
  aspect-ratio: 16 / 9;
}

.page-about .media--4x5 .media__img {
  aspect-ratio: 4 / 5;
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 0.78rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* ---------- 起点章节 ---------- */
.page-about .origin {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

/* ---------- 时间轴 ---------- */
.page-about .tl-phases {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .tl {
  position: relative;
  padding-left: var(--tl-pad);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: repeating-linear-gradient(180deg, rgba(167, 176, 192, 0.55) 0 9px, transparent 9px 19px);
}

.page-about .tl-phase {
  position: relative;
  display: inline-block;
  margin: 0 0 14px;
  padding: 6px 13px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--flag-white);
  background: var(--flag-blue);
}

.page-about .tl-phase::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--tl-pad) + 9px);
  top: 50%;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: currentColor;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 3px var(--ink);
}

.page-about .tl-phase--grow {
  background: var(--flag-yellow);
  color: var(--ink-deep);
}

.page-about .tl-phase--expand {
  background: var(--flag-green);
  color: var(--flag-white);
}

.page-about .tl-node {
  margin-bottom: 12px;
  padding: clamp(14px, 2.6vw, 20px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-strong);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(247, 241, 230, 0.04);
  transition: background 0.24s var(--ease-out);
}

.page-about .tl-node:hover {
  background: rgba(247, 241, 230, 0.07);
}

.page-about .tl-node--blue {
  border-left-color: var(--flag-blue);
}

.page-about .tl-node--green {
  border-left-color: var(--flag-green);
}

.page-about .tl-node--yellow {
  border-left-color: var(--flag-yellow);
}

.page-about .tl-node--red {
  border-left-color: var(--flag-red);
}

.page-about .tl-node__season {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .tl-node__title {
  margin: 5px 0 7px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 3.4vw, 1.35rem);
  line-height: 1.3;
}

.page-about .tl-node__lead {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(247, 241, 230, 0.8);
}

.page-about .tl-node details {
  margin-top: 10px;
}

.page-about .tl-node summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--lava-soft);
  list-style: none;
}

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

.page-about .tl-node summary::before {
  content: "＋";
  font-family: var(--font-mono);
}

.page-about .tl-node details[open] summary::before {
  content: "－";
}

.page-about .tl-node details p {
  margin: 10px 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(247, 241, 230, 0.76);
}

.page-about .tl-node details a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .tl-break {
  margin: 18px 0 18px calc(-1 * var(--tl-pad));
}

/* ---------- 服务版图（纸色带） ---------- */
.page-about .band--paper {
  color: var(--ink);
}

.page-about .band--paper .about-chapter__num {
  color: var(--flag-blue);
}

.page-about .band--paper .about-chapter__kicker {
  color: var(--mist-ink);
}

.page-about .band--paper .about-text {
  color: var(--ink-soft);
}

.page-about .band--paper .about-text a {
  color: var(--flag-blue);
}

.page-about .coverage {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--paper-line);
  background: var(--paper-line);
}

.page-about .stat {
  padding: clamp(14px, 2.6vw, 20px);
  background: var(--paper);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.45rem, 4.4vw, 2.1rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .stat--hot .stat__num {
  color: var(--lava);
}

.page-about .stat__label {
  display: block;
  margin-top: 7px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--mist-ink);
}

/* ---------- 团队 ---------- */
.page-about .team {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .team__body {
  display: grid;
  gap: clamp(18px, 3vw, 26px);
}

.page-about .roles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .role {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(247, 241, 230, 0.045);
}

.page-about .role__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .role:nth-child(1) .role__tag {
  color: var(--flag-blue);
}

.page-about .role:nth-child(2) .role__tag {
  color: var(--flag-green);
}

.page-about .role:nth-child(3) .role__tag {
  color: var(--flag-yellow);
}

.page-about .role:nth-child(4) .role__tag {
  color: var(--flag-red);
}

.page-about .role__name {
  margin: 6px 0 5px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.page-about .role__desc {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: rgba(247, 241, 230, 0.72);
}

.page-about .hubs {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .hubs li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 14px;
  border-left: 2px solid var(--line-strong);
  font-size: 0.88rem;
  color: rgba(247, 241, 230, 0.78);
}

.page-about .hubs .num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--flag-yellow);
}

/* ---------- 合作生态切换 ---------- */
.page-about .eco {
  position: relative;
}

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

.page-about .eco__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .eco__tab {
  display: inline-block;
  padding: 8px 15px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.83rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  cursor: pointer;
  transition: background 0.2s var(--ease-out), color 0.2s var(--ease-out), border-color 0.2s var(--ease-out);
}

.page-about .eco__tab:hover {
  border-color: var(--lava);
  color: var(--paper);
}

.page-about #eco-a:checked ~ .eco__tabs [for="eco-a"],
.page-about #eco-b:checked ~ .eco__tabs [for="eco-b"],
.page-about #eco-c:checked ~ .eco__tabs [for="eco-c"] {
  background: var(--lava);
  border-color: var(--lava);
  color: var(--ink-deep);
  font-weight: 700;
}

.page-about .eco__panels {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: clamp(16px, 3vw, 26px);
  background: rgba(247, 241, 230, 0.04);
}

.page-about .eco__panel {
  display: none;
}

.page-about #eco-a:checked ~ .eco__panels > .eco__panel:nth-child(1),
.page-about #eco-b:checked ~ .eco__panels > .eco__panel:nth-child(2),
.page-about #eco-c:checked ~ .eco__panels > .eco__panel:nth-child(3) {
  display: block;
}

.page-about .eco__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 3.4vw, 1.35rem);
}

.page-about .eco__text {
  margin: 0;
  max-width: 42em;
  font-size: 0.93rem;
  line-height: 1.8;
  color: rgba(247, 241, 230, 0.8);
}

.page-about .badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .badges li {
  padding: 6px 12px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-about .honors {
  display: grid;
  gap: 10px;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .honors li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  padding: 13px 15px;
  border-left: 3px solid var(--flag-yellow);
  background: rgba(247, 241, 230, 0.045);
}

.page-about .honor-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--flag-yellow);
  white-space: nowrap;
}

.page-about .honor-text {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(247, 241, 230, 0.78);
}

/* ---------- 准则与未来 ---------- */
.page-about .principles {
  display: grid;
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .principles li {
  padding: clamp(14px, 2.6vw, 20px);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(51, 224, 208, 0.09), rgba(255, 91, 45, 0.07));
}

.page-about .principles__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 3.2vw, 1.2rem);
}

.page-about .principles__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(247, 241, 230, 0.8);
}

.page-about .next-season {
  margin-top: clamp(22px, 3.5vw, 32px);
  padding: clamp(16px, 3vw, 24px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: rgba(8, 11, 18, 0.6);
}

.page-about .next-season__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lava);
}

.page-about .next-season__text {
  margin: 0;
  max-width: 44em;
  font-size: 0.93rem;
  line-height: 1.85;
  color: rgba(247, 241, 230, 0.82);
}

.page-about .next-season__text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 收口 CTA ---------- */
.page-about .about-cta {
  padding-block: clamp(38px, 6vw, 72px);
  background: var(--ink-deep);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(16px, 3vw, 24px);
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 5vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__links .btn {
  flex: 1 1 auto;
  text-align: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-cta__links .btn {
    flex: 0 0 auto;
    min-width: 190px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --tl-pad: 44px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .origin,
  .page-about .coverage,
  .page-about .team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .origin .media {
    align-self: center;
  }

  .page-about .roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .about-index {
    padding: 26px;
  }

  .page-about .tl-node {
    margin-bottom: 14px;
  }

  .page-about .stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .about-index a,
  .page-about .eco__tab,
  .page-about .breadcrumbs a {
    transition: none;
  }
}