.page-about {
  --about-line-soft: rgba(42, 47, 58, .78);
  --about-radius: 28px;
  color: var(--paper);
  position: relative;
  overflow-x: clip;
}

/* 面包屑留白 */
.page-about .yb-crumb {
  padding-block: 22px 4px;
}

/* ============ 首屏：对角错位色块 ============ */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(46px, 7vw, 96px) 0 clamp(40px, 5.5vw, 72px);
  overflow: hidden;
}

.page-about .about-hero__shard,
.page-about .about-hero__drift {
  position: absolute;
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero__shard {
  top: -16%;
  right: -8%;
  width: min(760px, 92%);
  height: 128%;
  background:
    linear-gradient(148deg, rgba(160, 107, 255, .20) 0%, rgba(160, 107, 255, .05) 46%, transparent 72%),
    linear-gradient(148deg, rgba(63, 224, 208, .10) 0%, transparent 52%);
  border-radius: var(--r-organic);
  transform: rotate(-6.5deg) skewY(-4deg);
  clip-path: polygon(14% 0, 100% 6%, 92% 100%, 0 86%);
}

.page-about .about-hero__drift {
  left: -12%;
  bottom: -34%;
  width: min(520px, 70%);
  height: 74%;
  background: linear-gradient(196deg, rgba(201, 123, 90, .16), rgba(124, 154, 107, .05) 58%, transparent 82%);
  border-radius: var(--r-organic);
  transform: rotate(11deg);
  clip-path: polygon(0 12%, 88% 0, 100% 84%, 10% 100%);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(36px, 7.4vw, 74px);
  line-height: .98;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title b {
  color: var(--cyan);
  font-weight: inherit;
  position: relative;
}

.page-about .about-hero__title b::after {
  content: "";
  position: absolute;
  left: 0;
  right: -6px;
  bottom: .06em;
  height: .09em;
  background: var(--cyan);
  opacity: .38;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin-top: 22px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
}

.page-about .about-stat {
  position: relative;
  padding: 16px 18px 16px 20px;
  background: color-mix(in srgb, var(--ink-2) 72%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  transition: border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .about-stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 3px;
  border-radius: 3px;
  background: var(--violet);
}

.page-about .about-stat:nth-child(2)::before { background: var(--cyan); }
.page-about .about-stat:nth-child(3)::before { background: var(--clay); }
.page-about .about-stat:nth-child(4)::before { background: var(--moss); }

.page-about .about-stat:hover {
  border-color: color-mix(in srgb, var(--violet) 55%, var(--line));
}

.page-about .about-stat dt {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
  margin-bottom: 6px;
}

.page-about .about-stat dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-stat dd em {
  font-family: var(--font-body);
  font-style: normal;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: .06em;
}

/* ============ 长期主张 ============ */
.page-about .about-claim {
  padding-top: clamp(34px, 5vw, 62px);
}

.page-about .about-claim__grid {
  align-items: start;
  gap: clamp(28px, 4.5vw, 60px);
}

.page-about .about-claim__text p {
  margin: 0 0 1.2em;
  color: color-mix(in srgb, var(--paper) 88%, var(--muted));
}

.page-about .about-claim__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-claim__list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15px;
  color: color-mix(in srgb, var(--paper) 78%, var(--muted));
}

.page-about .about-claim__dot {
  flex: none;
  width: 9px;
  height: 9px;
  margin-top: .55em;
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 0 4px rgba(124, 154, 107, .14);
}

.page-about .about-claim__dot--clay {
  background: var(--clay);
  box-shadow: 0 0 0 4px rgba(201, 123, 90, .14);
}

.page-about .about-claim__dot--violet {
  background: var(--violet);
  box-shadow: 0 0 0 4px rgba(160, 107, 255, .16);
}

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

.page-about .about-claim__figure::after {
  content: "";
  position: absolute;
  inset: auto -10px -10px auto;
  width: 96px;
  height: 96px;
  border-right: 1px solid var(--clay);
  border-bottom: 1px solid var(--clay);
  border-bottom-right-radius: var(--radius, var(--r-lg));
  pointer-events: none;
  opacity: .6;
}

.page-about .about-claim__figure .yb-media {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

/* ============ 发展历程 ============ */
.page-about .about-history {
  padding-top: clamp(48px, 7vw, 96px);
}

.page-about .about-history__grid {
  gap: clamp(24px, 3vw, 44px);
  align-items: start;
}

.page-about .about-index {
  position: sticky;
  top: calc(var(--header-h, 64px) + 24px);
  display: none;
}

.page-about .about-index__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-about .about-index__list li a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 0 9px 14px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: -1px;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-index__list li a:hover,
.page-about .about-index__list li a:focus-visible {
  color: var(--paper);
  border-left-color: var(--violet);
  outline: none;
}

.page-about .about-index__list li a[aria-current="true"] {
  color: var(--paper);
  border-left-color: var(--violet);
}

.page-about .about-history__main .yb-section__head {
  margin-bottom: clamp(28px, 4vw, 46px);
}

/* 时间轴 */
.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--line) 0%, var(--line) 78%, transparent 100%);
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: 32px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 0 3px var(--ink), 0 0 0 4px var(--moss);
  transition: box-shadow .22s var(--ease), background-color .22s var(--ease);
}

.page-about .about-tl__item:nth-child(even)::before {
  background: var(--clay);
  box-shadow: 0 0 0 3px var(--ink), 0 0 0 4px var(--clay);
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus-within::before {
  box-shadow: 0 0 0 3px var(--ink), 0 0 0 5px var(--cyan);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--muted);
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 6px;
}

.page-about .about-tl__year em {
  font-family: var(--font-serif);
  font-style: normal;
  font-size: 12px;
  letter-spacing: .16em;
  color: color-mix(in srgb, var(--muted) 82%, transparent);
}

.page-about .about-tl__body {
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: linear-gradient(90deg, rgba(14, 26, 43, .62), rgba(14, 26, 43, .16));
  transition: border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .about-tl__item:nth-child(even) .about-tl__body {
  border-left-color: color-mix(in srgb, var(--clay) 62%, var(--line));
}

.page-about .about-tl__item:nth-child(odd) .about-tl__body {
  border-left-color: color-mix(in srgb, var(--moss) 62%, var(--line));
}

.page-about .about-tl__item:hover .about-tl__body,
.page-about .about-tl__item:focus-within .about-tl__body {
  border-color: color-mix(in srgb, var(--clay) 70%, var(--line));
  border-left-color: var(--clay);
}

.page-about .about-tl__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.page-about .about-tl__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: color-mix(in srgb, var(--paper) 82%, var(--muted));
}

/* 右侧旁注 */
.page-about .about-history__side {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-side-card {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: color-mix(in srgb, var(--ink-2) 66%, transparent);
  position: relative;
  overflow: hidden;
}

.page-about .about-side-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--violet);
  opacity: .8;
}

.page-about .about-side-card--cyan::before { background: var(--cyan); }

.page-about .about-side-card__big {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 44px;
  line-height: 1;
  margin: 10px 0 10px;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-side-card__big span {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
  margin-left: 4px;
}

.page-about .about-side-card__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: color-mix(in srgb, var(--paper) 78%, var(--muted));
}

.page-about .about-side-card .yb-note {
  margin: 0;
}

/* ============ 赛区版图全宽横幅 ============ */
.page-about .about-banner {
  position: relative;
  margin: clamp(40px, 6vw, 82px) 0;
  overflow: hidden;
  background: linear-gradient(160deg, var(--ink-2) 0%, var(--ink) 62%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-banner::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -6%;
  width: 58%;
  height: 150%;
  background: linear-gradient(140deg, rgba(160, 107, 255, .17), transparent 62%);
  transform: rotate(-8deg);
  clip-path: polygon(20% 0, 100% 4%, 86% 100%, 0 92%);
  pointer-events: none;
}

.page-about .about-banner__figure {
  position: relative;
  margin: 0;
  line-height: 0;
  max-height: 380px;
  overflow: hidden;
}

.page-about .about-banner__figure img {
  width: 100%;
  height: 100%;
  max-height: 380px;
  object-fit: cover;
  opacity: .72;
  filter: saturate(.82);
}

.page-about .about-banner__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 8, 13, .1) 0%, rgba(7, 8, 13, .92) 88%);
}

.page-about .about-banner__body {
  position: relative;
  padding-top: clamp(4px, 1.5vw, 14px);
  padding-bottom: clamp(40px, 6vw, 72px);
  margin-top: -60px;
  z-index: 1;
}

.page-about .about-banner__title {
  margin: 10px 0 0;
  max-width: 22ch;
}

.page-about .about-banner__lede {
  max-width: 70ch;
  margin: 18px 0 0;
  color: color-mix(in srgb, var(--paper) 84%, var(--muted));
}

.page-about .about-zones {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-zone {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 12px;
  align-items: baseline;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(7, 8, 13, .5);
  text-decoration: none;
  color: var(--paper);
  transition: border-color .2s var(--ease), background-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-zone .yb-data {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--cyan);
  align-self: center;
}

.page-about .about-zone b {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: .02em;
}

.page-about .about-zone i {
  font-style: normal;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .04em;
}

.page-about .about-zone:hover,
.page-about .about-zone:focus-visible {
  border-color: var(--violet);
  background: rgba(160, 107, 255, .1);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-banner__hint {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-banner__hint a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 208, .4);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-banner__hint a:hover,
.page-about .about-banner__hint a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
  outline: none;
}

/* ============ 观众结构 ============ */
.page-about .about-audience {
  padding-top: clamp(34px, 5vw, 64px);
}

.page-about .about-audience__head,
.page-about .about-audience__body {
  min-width: 0;
}

.page-about .about-audience__note {
  margin-top: 16px;
  padding-left: 14px;
  border-left: 2px solid var(--clay);
}

.page-about .about-audience__body p {
  margin: 0 0 1.2em;
  color: color-mix(in srgb, var(--paper) 86%, var(--muted));
}

.page-about .about-meters {
  display: grid;
  gap: 22px;
  margin: 30px 0;
}

.page-about .about-meter-row {
  display: grid;
  gap: 10px;
}

.page-about .about-meter-row__label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-meter-row__label .yb-data {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--paper);
}

.page-about .about-meter-row .yb-meter__track {
  height: 6px;
  border-radius: 6px;
  background: var(--line);
  overflow: hidden;
}

.page-about .about-meter-row .yb-meter__bar {
  height: 100%;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--violet), #c39bff);
  width: var(--p, 0%);
  transition: width .3s var(--ease);
}

.page-about .about-meter-row .about-meter__bar--cyan {
  background: linear-gradient(90deg, var(--cyan), #8ff3e6);
}

.page-about .about-audience__tail {
  padding-top: 4px;
  border-top: 1px solid var(--about-line-soft);
  margin-top: 4px;
  padding-top: 22px !important;
}

/* ============ 团队分工 ============ */
.page-about .about-team {
  padding-top: clamp(40px, 6vw, 80px);
}

.page-about .about-team__head {
  max-width: 74ch;
}

.page-about .about-team__figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-team__figure .yb-media {
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid var(--line);
  position: relative;
}

.page-about .about-team__figure .yb-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(63, 224, 208, .10), transparent 46%);
  pointer-events: none;
}

.page-about .about-team__tree {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-tree__group {
  padding: 22px 22px 6px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--moss);
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  background: linear-gradient(180deg, rgba(124, 154, 107, .08), transparent 42%);
}

.page-about .about-tree__group--cyan {
  border-top-color: var(--cyan);
  background: linear-gradient(180deg, rgba(63, 224, 208, .08), transparent 42%);
}

.page-about .about-tree__root {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: .01em;
}

.page-about .about-tree__root .yb-data {
  font-family: var(--font-mono);
  color: var(--muted);
  font-size: 15px;
}

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

.page-about .about-tree__list li {
  position: relative;
  padding: 12px 0 12px 22px;
  font-size: 15px;
  line-height: 1.72;
  color: color-mix(in srgb, var(--paper) 82%, var(--muted));
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-tree__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 1.35em;
  width: 12px;
  height: 1px;
  background: var(--moss);
}

.page-about .about-tree__group--cyan .about-tree__list li::before {
  background: var(--cyan);
}

/* ============ 下一步 ============ */
.page-about .about-next {
  padding-top: clamp(40px, 6vw, 78px);
}

.page-about .about-next__head h2 {
  max-width: 16ch;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.page-about .about-next__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-next__list li:last-child {
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-next__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--clay);
  padding-top: .35em;
}

.page-about .about-next__list h3 {
  margin: 0 0 6px;
}

.page-about .about-next__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: color-mix(in srgb, var(--paper) 82%, var(--muted));
}

/* ============ 延伸入口 ============ */
.page-about .about-extend {
  padding-top: clamp(30px, 4vw, 52px);
  padding-bottom: clamp(48px, 7vw, 92px);
}

.page-about .about-extend__box {
  padding: clamp(22px, 3.5vw, 36px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    linear-gradient(120deg, rgba(160, 107, 255, .09), transparent 46%),
    color-mix(in srgb, var(--ink-2) 54%, transparent);
  position: relative;
  overflow: hidden;
}

.page-about .about-extend__box::after {
  content: "";
  position: absolute;
  right: -42px;
  bottom: -42px;
  width: 150px;
  height: 150px;
  border: 1px solid var(--clay);
  border-radius: var(--r-organic);
  transform: rotate(18deg);
  opacity: .35;
  pointer-events: none;
}

.page-about .about-extend__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  grid-template-columns: 1fr;
}

.page-about .about-extend__list li {
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-extend__list li a {
  display: block;
  padding: 14px 0;
  font-size: 15px;
  color: color-mix(in srgb, var(--paper) 88%, var(--muted));
  text-decoration: none;
  position: relative;
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}

.page-about .about-extend__list li a::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 1px;
  width: 0;
  background: var(--violet);
  transition: width .18s var(--ease);
}

.page-about .about-extend__list li a:hover,
.page-about .about-extend__list li a:focus-visible {
  color: var(--paper);
  padding-left: 8px;
  outline: none;
}

.page-about .about-extend__list li a:hover::before,
.page-about .about-extend__list li a:focus-visible::before {
  width: 44px;
}

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

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-index {
    display: block;
  }

  .page-about .about-tl {
    padding-left: 0;
  }

  .page-about .about-tl::before {
    left: 152px;
    top: 16px;
    bottom: 30px;
  }

  .page-about .about-tl__item {
    display: grid;
    grid-template-columns: 128px minmax(0, 1fr);
    column-gap: 44px;
    padding-bottom: 34px;
  }

  .page-about .about-tl__item::before {
    left: 147px;
    top: 9px;
  }

  .page-about .about-tl__year {
    justify-content: flex-end;
    margin-bottom: 0;
    padding-top: 5px;
  }

  .page-about .about-tl__body {
    border-radius: var(--r-sm);
  }

  .page-about .about-history__side {
    margin-top: 0;
  }

  .page-about .about-audience__head {
    position: sticky;
    top: calc(var(--header-h, 64px) + 28px);
  }

  .page-about .about-next__head {
    position: sticky;
    top: calc(var(--header-h, 64px) + 28px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-claim__figure {
    margin-top: 12px;
  }

  .page-about .about-claim__grid {
    gap: clamp(40px, 5vw, 72px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-zone,
  .page-about .about-stat,
  .page-about .about-tl__body,
  .page-about .about-tl__item::before,
  .page-about .about-extend__list li a,
  .page-about .about-meter-row .yb-meter__bar {
    transition: none !important;
  }

  .page-about .about-zone:hover,
  .page-about .about-zone:focus-visible {
    transform: none;
  }
}

.page-about {
  --p: 1rem;
  --radius: var(--about-radius);
}