.page-about {
  --about-axis: 26px;
  --about-frame: var(--line-steel);
  position: relative;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-void);
  border-bottom: 1px solid var(--about-frame);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .4;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 95% at 10% 0%, rgba(255, 138, 43, .18), transparent 58%),
    radial-gradient(80% 70% at 92% 12%, rgba(63, 224, 208, .12), transparent 62%),
    linear-gradient(180deg, rgba(5, 10, 20, .6) 0%, rgba(5, 10, 20, .88) 55%, var(--ink-base) 100%);
  pointer-events: none;
}

.page-about .about-hero__body {
  position: relative;
  padding: 58px 0 48px;
}

.page-about .breadcrumbs {
  margin-bottom: 22px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -.012em;
  color: var(--fog);
  margin: 12px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.85;
  color: var(--blue-gray);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 38px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-frame);
  display: grid;
  gap: 18px;
}

.page-about .about-hero__facts li {
  display: grid;
  gap: 5px;
}

.page-about .fact__num {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--orange);
}

.page-about .fact__text {
  font-size: .875rem;
  line-height: 1.6;
  color: var(--blue-gray);
}

/* ============ 主张解读 ============ */
.page-about .about-why {
  background: var(--ink-base);
}

.page-about .about-why__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-why__main .section__title {
  margin-top: 10px;
}

.page-about .about-why__main p {
  margin: 16px 0 0;
  line-height: 1.9;
  color: var(--blue-gray);
}

.page-about .about-why__main .btn {
  margin-top: 28px;
}

.page-about .about-why__side {
  padding: 26px 24px;
  color: var(--ink-void);
}

.page-about .about-why__side .eyebrow {
  color: var(--orange-deep);
}

.page-about .about-why__quote {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.22rem;
  line-height: 1.5;
  color: var(--ink-void);
}

.page-about .about-why__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-why__list li {
  position: relative;
  padding-left: 18px;
  font-size: .875rem;
  line-height: 1.7;
  color: #2A3550;
}

.page-about .about-why__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 9px;
  height: 1px;
  background: var(--orange-deep);
}

/* ============ 时间轴 ============ */
.page-about .about-timeline {
  background: linear-gradient(180deg, var(--ink-base) 0%, var(--ink-void) 100%);
  border-top: 1px solid var(--about-frame);
}

.page-about .about-timeline__lead {
  margin: 14px 0 0;
  max-width: 56ch;
  line-height: 1.85;
  color: var(--blue-gray);
}

.page-about .tl {
  list-style: none;
  margin: 44px 0 0;
  padding: 0 0 0 var(--about-axis);
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line-steel) 22%, var(--line-steel) 78%, transparent 100%);
}

.page-about .tl__item {
  position: relative;
  display: grid;
  gap: 10px;
  padding-bottom: 34px;
}

.page-about .tl__node {
  position: absolute;
  left: calc(var(--about-axis) * -1);
  top: 4px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--line-steel);
  background: var(--ink-void);
  display: grid;
  place-items: center;
}

.page-about .tl__node::after {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .tl__meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .tl__index {
  font-size: 1rem;
  font-weight: 700;
  color: var(--orange);
}

.page-about .tl__body h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.12rem, 2.4vw, 1.38rem);
  line-height: 1.4;
  color: var(--fog);
}

.page-about .tl__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.88;
  color: var(--blue-gray);
}

/* ============ 内容团队 ============ */
.page-about .about-team {
  background: var(--ink-base);
  border-top: 1px solid var(--about-frame);
}

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

.page-about .about-team__text p {
  margin: 16px 0 0;
  line-height: 1.88;
  color: var(--blue-gray);
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--about-frame);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-void);
  box-shadow: var(--shadow-panel);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-team__media figcaption {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--muted);
  border-top: 1px solid var(--about-frame);
}

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

.page-about .about-team__card {
  padding: 24px 22px;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-team__card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.16rem;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.82;
  color: var(--blue-gray);
}

/* ============ 协作生态 ============ */
.page-about .about-eco {
  background: var(--ink-void);
  border-top: 1px solid var(--about-frame);
}

.page-about .about-eco .section__head p {
  margin: 14px 0 0;
  max-width: 60ch;
  line-height: 1.85;
  color: var(--blue-gray);
}

.page-about .eco-figure {
  margin-top: 36px;
  overflow-x: auto;
  border: 1px solid var(--about-frame);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(17, 30, 56, .75) 0%, rgba(5, 10, 20, .92) 100%);
}

.page-about .eco-figure svg {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}

.page-about .eco-grid-line {
  stroke: var(--line-steel);
  opacity: .55;
}

.page-about .eco-link {
  stroke: var(--line-steel);
  stroke-width: 1;
  stroke-dasharray: 4 6;
}

.page-about .eco-core circle {
  fill: var(--ink-void);
  stroke: var(--orange);
  stroke-width: 1.5;
}

.page-about .eco-core__title {
  fill: var(--fog);
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  text-anchor: middle;
}

.page-about .eco-core__sub {
  fill: var(--orange);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  text-anchor: middle;
}

.page-about .eco-node circle {
  fill: var(--ink-raised);
  stroke: var(--line-steel);
  stroke-width: 1;
  transition: fill .2s ease, stroke .2s ease;
}

.page-about .eco-node:hover circle,
.page-about .eco-node:focus-visible circle {
  fill: var(--orange-deep);
  stroke: var(--orange);
}

.page-about .eco-node:focus-visible {
  outline: none;
}

.page-about .eco-node__t {
  fill: var(--fog);
  font-family: var(--font-body);
  font-size: 17px;
  text-anchor: middle;
}

.page-about .eco-node__n {
  fill: var(--cyan);
  font-family: var(--font-mono);
  font-size: 14px;
  text-anchor: middle;
}

.page-about .about-eco__cards {
  margin-top: 28px;
}

.page-about .about-eco__card {
  padding: 22px 20px;
}

.page-about .about-eco__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .about-eco__card p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.82;
  color: var(--blue-gray);
}

.page-about .about-eco__media {
  margin: 32px 0 0;
  border: 1px solid var(--about-frame);
  border-radius: var(--radius-md);
}

/* ============ 热度榜 ============ */
.page-about .about-heat {
  background: var(--ink-base);
  border-top: 1px solid var(--about-frame);
}

.page-about .about-heat__lead {
  margin: 14px 0 0;
  max-width: 58ch;
  line-height: 1.85;
  color: var(--blue-gray);
}

.page-about .heat-board {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  border-bottom: 1px solid var(--about-frame);
}

.page-about .heat-row {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  grid-template-areas:
    "rank city tag"
    "track track track";
  align-items: center;
  gap: 10px 14px;
  padding: 15px 0;
  border-top: 1px solid var(--about-frame);
}

.page-about .heat-rank {
  grid-area: rank;
  font-family: var(--font-mono);
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .heat-rank--top {
  color: var(--red);
}

.page-about .heat-city {
  grid-area: city;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--fog);
}

.page-about .heat-track {
  grid-area: track;
  display: block;
  height: 10px;
  border-radius: var(--radius-pill);
  background: var(--ink-raised);
  border: 1px solid var(--about-frame);
  overflow: hidden;
}

.page-about .heat-fill {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--orange-deep), var(--orange));
}

.page-about .heat-fill--1 { width: 100%; }
.page-about .heat-fill--2 { width: 92%; }
.page-about .heat-fill--3 { width: 84%; }
.page-about .heat-fill--4 { width: 73%; }
.page-about .heat-fill--5 { width: 64%; }
.page-about .heat-fill--6 { width: 56%; }

.page-about .heat-tag {
  grid-area: tag;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .03em;
  color: var(--blue-gray);
  white-space: nowrap;
}

.page-about .heat-foot {
  margin: 14px 0 0;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 收束 ============ */
.page-about .about-close {
  background: linear-gradient(180deg, var(--ink-base) 0%, var(--ink-void) 100%);
  border-top: 1px solid var(--about-frame);
}

.page-about .about-close__head p {
  margin: 14px 0 0;
  max-width: 56ch;
  line-height: 1.85;
  color: var(--blue-gray);
}

.page-about .about-close__grid {
  margin-top: 36px;
}

.page-about .about-close__card {
  padding: 22px 20px;
  border: 1px solid var(--about-frame);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(17, 30, 56, .85) 0%, rgba(10, 18, 36, .95) 100%);
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-close__num {
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-close__card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .about-close__card p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.78;
  color: var(--blue-gray);
}

.page-about .about-close__cta {
  margin-top: 34px;
  padding: 26px 24px;
  border: 1px dashed var(--line-steel);
  border-radius: var(--radius-md);
  background: rgba(17, 30, 56, .5);
  display: grid;
  gap: 18px;
}

.page-about .about-close__cta-text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--blue-gray);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 响应式 ============ */
@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 26px;
  }

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

@media (min-width: 900px) {
  .page-about {
    --about-axis: 34px;
  }

  .page-about .about-hero__body {
    padding: 84px 0 64px;
  }

  .page-about .about-why__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .tl__item {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 0 36px;
    padding-bottom: 44px;
  }

  .page-about .tl__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .about-team__intro {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }

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

  .page-about .heat-row {
    grid-template-columns: 46px 92px minmax(0, 1fr) 132px;
    grid-template-areas: "rank city track tag";
    gap: 0 18px;
    padding: 17px 0;
  }

  .page-about .about-close__cta {
    padding: 30px 32px;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1040px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-hero__facts li {
    padding: 0 24px;
    border-left: 1px solid var(--about-frame);
  }

  .page-about .about-hero__facts li:first-child {
    padding-left: 0;
    border-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .eco-node circle,
  .page-about .about-close__card,
  .page-about .btn {
    transition: none;
  }
}