.page-about {
  --about-ink-soft: #57493D;
  --about-paper-line: #D6C6A8;
  background: var(--ky-night);
  color: var(--ky-white);
  font-family: var(--ky-font-sans);
  -webkit-font-smoothing: antialiased;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: calc(var(--ky-header-h) + 20px);
}

.page-about .about-crumb .ky-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ky-star);
}

.page-about .about-crumb .ky-breadcrumb__item {
  color: var(--ky-star);
  text-decoration: none;
}

.page-about .about-crumb a.ky-breadcrumb__item:hover {
  color: var(--ky-cyan);
}

.page-about .about-crumb__sep {
  color: var(--ky-line);
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  padding-top: clamp(20px, 3vw, 42px);
  padding-bottom: clamp(34px, 5vw, 66px);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 80% at 84% 0%, rgba(47, 182, 201, 0.16), transparent 62%),
    radial-gradient(90% 70% at 6% 100%, rgba(255, 106, 43, 0.1), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-cover__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-cover__title {
  margin: 0 0 18px;
  font-family: var(--ky-font-display);
  font-size: clamp(34px, 6.2vw, 68px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--ky-white);
}

.page-about .about-cover__lede {
  margin: 0 0 28px;
  max-width: 46ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.8;
  color: var(--ky-star);
}

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

.page-about .about-cover__media {
  margin: 0;
  position: relative;
  aspect-ratio: 16 / 10;
  border-radius: var(--ky-radius-lg);
  overflow: hidden;
  border: 1px solid var(--ky-line);
  background: var(--ky-night-2);
}

.page-about .about-cover__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-cover__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 18, 32, 0.05) 30%, rgba(11, 18, 32, 0.72) 100%);
  pointer-events: none;
}

@media (min-width: 940px) {
  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 6.5fr) minmax(0, 5.5fr);
    align-items: center;
  }
}

/* 封面数据条 */
.page-about .about-cover__stats {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(30px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ky-line);
  border-top: 1px solid var(--ky-line);
  border-bottom: 1px solid var(--ky-line);
}

.page-about .about-cover__stat {
  background: var(--ky-night);
  padding: clamp(18px, 2.4vw, 26px) clamp(10px, 1.6vw, 20px);
}

.page-about .about-cover__num {
  display: block;
  font-family: var(--ky-font-display);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ky-cyan);
}

.page-about .about-cover__unit {
  margin-left: 2px;
  font-size: 0.62em;
  color: var(--ky-orange);
}

.page-about .about-cover__label {
  display: block;
  margin-top: 8px;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--ky-star);
}

@media (min-width: 780px) {
  .page-about .about-cover__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主从布局 ---------- */
.page-about .about-body {
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-aside {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-toc {
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-radius-soft);
  background: var(--ky-night-2);
  padding: 16px;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ky-star);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-toc__link {
  display: block;
  padding: 6px 12px;
  border: 1px solid var(--ky-line);
  border-radius: 999px;
  color: var(--ky-star);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-toc__link:hover {
  color: var(--ky-white);
  border-color: var(--ky-cyan-deep);
  background: rgba(47, 182, 201, 0.08);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--ky-cyan);
  border-color: var(--ky-cyan);
  background: rgba(47, 182, 201, 0.12);
}

.page-about .about-aside__top {
  display: inline-block;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ky-star);
  text-decoration: none;
}

.page-about .about-aside__top:hover {
  color: var(--ky-cyan);
}

@media (min-width: 1020px) {
  .page-about .about-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-toc__link {
    padding: 8px 10px 8px 12px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 6px 6px 0;
    font-size: 14px;
  }

  .page-about .about-toc__link[aria-current="true"] {
    border-left-color: var(--ky-cyan);
    background: rgba(47, 182, 201, 0.1);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: clamp(36px, 5vw, 64px);
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--ky-line);
}

.page-about .about-head__num {
  margin: 0 0 10px;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ky-cyan);
}

.page-about .about-head__title {
  margin: 0 0 14px;
  font-family: var(--ky-font-display);
  font-size: clamp(25px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ky-white);
}

.page-about .about-head__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--ky-star);
}

.page-about .about-panel {
  padding: clamp(22px, 3.4vw, 44px);
  border-radius: var(--ky-radius-lg);
}

.page-about .about-panel--paper {
  background: var(--ky-paper);
  color: var(--ky-ink);
}

.page-about .about-panel--paper .about-head__title {
  color: var(--ky-ink);
}

.page-about .about-panel--paper .about-head__lede {
  color: var(--about-ink-soft);
}

.page-about .about-panel--paper .about-head__num {
  color: var(--ky-cyan-deep);
}

.page-about .about-panel--night {
  background: var(--ky-night-2);
  border: 1px solid var(--ky-line);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0 0 0 24px;
  border-left: 2px solid var(--ky-line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(24px, 3vw, 36px);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 10px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ky-night);
  border: 2px solid var(--ky-cyan);
}

.page-about .about-timeline__item--key::before {
  background: var(--ky-orange);
  border-color: var(--ky-orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.16);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--ky-font-display);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ky-white);
}

.page-about .about-timeline__item--key .about-timeline__year {
  color: var(--ky-orange);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ky-white);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ky-star);
}

@media (min-width: 720px) {
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 6px 24px;
  }

  .page-about .about-timeline__year {
    grid-column: 1;
    padding-top: 2px;
  }

  .page-about .about-timeline__body {
    grid-column: 2;
  }
}

.page-about .about-timeline__texture {
  margin: clamp(28px, 4vw, 44px) 0 0;
  aspect-ratio: 21 / 9;
  border-radius: var(--ky-radius-lg);
  overflow: hidden;
  border: 1px solid var(--ky-line);
  background: var(--ky-night-2);
}

.page-about .about-timeline__texture img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  aspect-ratio: 16 / 9;
  border-radius: var(--ky-radius-soft);
  overflow: hidden;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(22px, 3vw, 34px);
}

@media (min-width: 760px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-role {
  padding: 18px 18px 20px;
  border-radius: var(--ky-radius-soft);
  background: var(--ky-paper-2);
  border: 1px solid var(--about-paper-line);
}

.page-about .about-role__num {
  display: inline-block;
  font-family: var(--ky-font-display);
  font-weight: 800;
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ky-ink);
}

.page-about .about-role__unit {
  margin-left: 3px;
  font-size: 0.5em;
  color: var(--ky-cyan-deep);
}

.page-about .about-role__name {
  margin: 10px 0 8px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ky-ink);
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ---------- 内容标准步骤 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 820px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .about-step {
  position: relative;
  padding: 20px;
  border-radius: var(--ky-radius-soft);
  background: var(--ky-night-2);
  border: 1px solid var(--ky-line);
  border-top: 2px solid var(--ky-cyan);
  transition: transform 0.22s ease, border-top-color 0.22s ease;
}

.page-about .about-step:hover {
  transform: translateY(-4px);
  border-top-color: var(--ky-orange);
}

.page-about .about-step__no {
  margin: 0 0 10px;
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ky-star);
}

.page-about .about-step h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ky-white);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ky-star);
}

.page-about .about-step .about-step__meta {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--ky-line);
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ky-cyan);
}

/* ---------- 会员等级 ---------- */
.page-about .about-tiers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(24px, 3.2vw, 38px);
}

@media (min-width: 700px) {
  .page-about .about-tiers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) {
  .page-about .about-tiers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-tier {
  padding: 20px 18px 22px;
  border-radius: var(--ky-radius-soft);
  border: 1px solid var(--ky-line);
  background: linear-gradient(180deg, rgba(253, 253, 251, 0.05), rgba(253, 253, 251, 0));
  transition: border-color 0.22s ease;
}

.page-about .about-tier:hover {
  border-color: var(--ky-cyan-deep);
}

.page-about .about-tier--key {
  border-color: rgba(255, 106, 43, 0.55);
  background: linear-gradient(180deg, rgba(255, 106, 43, 0.16), rgba(255, 106, 43, 0));
}

.page-about .about-tier__index {
  font-family: var(--ky-font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ky-star);
}

.page-about .about-tier__name {
  display: block;
  margin: 12px 0 10px;
  font-family: var(--ky-font-display);
  font-weight: 800;
  font-size: 26px;
  letter-spacing: 0.04em;
  color: var(--ky-white);
}

.page-about .about-tier--key .about-tier__name {
  color: var(--ky-orange);
}

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

/* ---------- 内容来源 ---------- */
.page-about .about-sources {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(24px, 3.2vw, 38px);
}

@media (min-width: 900px) {
  .page-about .about-sources {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-sources__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-sources__list li {
  position: relative;
  padding-left: 24px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ky-star);
}

.page-about .about-sources__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 12px;
  height: 2px;
  background: var(--ky-cyan);
}

.page-about .about-callout {
  padding: 22px 20px;
  border-radius: var(--ky-radius-soft);
  background: var(--ky-paper);
  color: var(--ky-ink);
  border-left: 4px solid var(--ky-orange);
}

.page-about .about-callout__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ky-ink);
}

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

.page-about .about-callout a {
  font-size: 14px;
  font-weight: 700;
  color: var(--ky-cyan-deep);
  text-decoration: none;
}

.page-about .about-callout a:hover {
  text-decoration: underline;
}

/* ---------- 数字一览 ---------- */
.page-about .about-numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 3.6vw, 42px);
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-radius-lg);
  overflow: hidden;
  background: var(--ky-line);
}

.page-about .about-number {
  position: relative;
  background: var(--ky-night-2);
  padding: clamp(20px, 2.6vw, 30px) clamp(14px, 2vw, 22px);
}

.page-about .about-number__num {
  display: block;
  font-family: var(--ky-font-display);
  font-weight: 800;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ky-white);
}

.page-about .about-number__unit {
  margin-left: 3px;
  font-size: 0.48em;
  color: var(--ky-cyan);
}

.page-about .about-number__label {
  display: block;
  margin-top: 22px;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--ky-star);
}

.page-about .about-number::after {
  content: "";
  position: absolute;
  left: clamp(14px, 2vw, 22px);
  bottom: 34px;
  width: 30px;
  height: 3px;
  border-radius: 2px;
  background: var(--ky-orange);
  opacity: 0.85;
}

@media (min-width: 720px) {
  .page-about .about-numbers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1060px) {
  .page-about .about-numbers {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

/* ---------- 结尾 ---------- */
.page-about .about-end {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: clamp(26px, 3.6vw, 40px);
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--ky-line);
  border-radius: var(--ky-radius-lg);
  background: radial-gradient(120% 160% at 0% 0%, rgba(47, 182, 201, 0.12), transparent 62%);
}

.page-about .about-end__text {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ky-white);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-tier,
  .page-about .about-toc__link {
    transition: none;
  }

  .page-about .about-step:hover {
    transform: none;
  }
}