.page-about {
  --about-gap: clamp(52px, 7vw, 96px);
  --about-nudge: cubic-bezier(.2, .75, .3, 1);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(34px, 5.4vw, 68px) 0 clamp(46px, 7vw, 92px);
  color: var(--white);
  background:
    radial-gradient(88% 118% at 88% 4%, rgba(0, 194, 168, .24), transparent 62%),
    radial-gradient(72% 92% at 2% 100%, rgba(255, 107, 53, .2), transparent 64%),
    linear-gradient(155deg, var(--green-deep) 0%, var(--green) 58%, var(--green-soft) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -12% -42% -12%;
  height: 64%;
  pointer-events: none;
  background: repeating-linear-gradient(115deg, rgba(255, 255, 255, .055) 0 2px, transparent 2px 28px);
}

.page-about .about-hero-inner {
  position: relative;
  display: grid;
  gap: 30px;
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: center;
  }
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--orange-soft);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.2vw, 62px);
  line-height: 1.08;
  letter-spacing: -.025em;
  font-weight: 800;
}

.page-about .about-hero-lead {
  max-width: 42em;
  margin: 22px 0 0;
  font-size: clamp(15px, 2vw, 17.5px);
  line-height: 1.8;
  color: rgba(255, 255, 255, .84);
}

.page-about .about-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
}

.page-about .about-tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, .26);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(255, 255, 255, .9);
  background: rgba(255, 255, 255, .07);
  white-space: nowrap;
}

.page-about .about-tag--accent {
  border-color: transparent;
  background: var(--orange);
  color: var(--white);
}

.page-about .about-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
}

.page-about .about-hero-visual {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-invert);
  border-radius: var(--radius-lg);
  background: rgba(6, 38, 28, .55);
  box-shadow: var(--shadow-lift);
  transform: rotate(-1.2deg);
  transition: transform .5s var(--about-nudge);
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 轨道 + 正文 ---------- */
.page-about .about-layout {
  padding-top: clamp(40px, 6vw, 76px);
  padding-bottom: clamp(48px, 7vw, 88px);
  row-gap: clamp(28px, 4vw, 48px);
}

.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail .rail-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--muted);
  margin: 0 0 12px;
}

.page-about .about-rail .rail-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-rail .rail-link {
  flex: 0 0 auto;
  white-space: nowrap;
}

.page-about .about-rail .rail-foot {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    align-self: start;
    padding-top: 8px;
  }

  .page-about .about-rail .rail-list {
    display: grid;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail .rail-link {
    white-space: normal;
  }
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-gap);
  min-width: 0;
}

/* ---------- 章节头 ---------- */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 24px);
  min-width: 0;
}

.page-about .about-head {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  align-items: start;
  padding-bottom: 18px;
  margin-bottom: 26px;
}

.page-about .about-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 92px;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
}

.page-about .about-index {
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 62px);
  font-weight: 700;
  line-height: .88;
  letter-spacing: -.05em;
  color: var(--orange);
}

.page-about .about-kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--green-soft);
}

.page-about .about-title {
  margin: 0;
  font-size: clamp(23px, 3.6vw, 37px);
  line-height: 1.18;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-lead {
  margin: 0 0 26px;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.8;
  color: var(--muted);
  max-width: 46em;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.82;
  color: var(--ink);
}

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

/* ---------- 引言斜切块 ---------- */
.page-about .about-quote {
  position: relative;
  margin: 30px 0 0;
  padding: 26px 24px;
  color: var(--white);
  background: linear-gradient(118deg, var(--green) 0%, var(--green-soft) 100%);
  border-radius: var(--radius-md);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-quote::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  width: 56px;
  height: 4px;
  border-radius: 0 0 4px 4px;
  background: var(--orange);
}

.page-about .about-quote p {
  margin: 6px 0 0;
  font-size: clamp(16px, 2.3vw, 21px);
  line-height: 1.68;
  font-weight: 600;
}

/* ---------- 受众清单 ---------- */
.page-about .about-audience {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-audience li {
  position: relative;
  padding-left: 28px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-audience li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--orange);
}

/* ---------- 三类内容卡片 ---------- */
.page-about .about-cards {
  display: grid;
  gap: 18px;
}

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

.page-about .about-card {
  position: relative;
  padding: 26px 22px 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: transform .38s var(--about-nudge), box-shadow .38s var(--about-nudge), border-color .38s var(--about-nudge);
}

.page-about .about-card::after {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  top: 0;
  height: 4px;
  border-radius: 0 0 4px 4px;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
  opacity: 0;
  transition: opacity .38s var(--about-nudge);
}

.page-about .about-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lift);
  border-color: rgba(255, 107, 53, .42);
}

.page-about .about-card:hover::after {
  opacity: 1;
}

.page-about .about-card-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--green-soft);
}

.page-about .about-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--ink);
}

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

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  margin-top: 30px;
  padding: 26px 24px 28px;
  background: var(--gray);
  border-radius: var(--radius-lg);
}

.page-about .about-rhythm h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  color: var(--green);
}

.page-about .about-rhythm p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 青训 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .9fr);
    gap: clamp(28px, 4vw, 48px);
    align-items: center;
  }
}

.page-about .about-split-body p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.82;
  color: var(--ink);
}

.page-about .about-youth-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-youth-list li {
  display: grid;
  gap: 2px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: var(--surface-muted);
  border-left: 3px solid var(--green-soft);
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--ink);
}

.page-about .about-youth-list li span {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--green-soft);
}

.page-about .about-youth-media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--green-deep);
  box-shadow: var(--shadow-soft);
}

.page-about .about-youth-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-caption {
  display: block;
  padding: 14px 18px 16px;
  font-size: 12.5px;
  line-height: 1.65;
  color: rgba(255, 255, 255, .74);
  background: var(--green-deep);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--orange), var(--cyan) 58%, rgba(11, 61, 46, .1));
}

.page-about .about-timeline > li {
  position: relative;
  padding-left: 34px;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--white);
  border: 3px solid var(--green);
}

.page-about .about-timeline .about-timeline-when {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .about-timeline h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-timeline p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 数字带 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 34px;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  padding: 20px 18px 18px;
  border-radius: var(--radius-md);
  background: var(--green);
  color: var(--white);
}

.page-about .about-stat--accent {
  background: var(--orange);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.6vw, 31px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.02em;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(255, 255, 255, .76);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 26px;
  margin-top: 34px;
}

@media (min-width: 860px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: clamp(28px, 4vw, 46px);
    align-items: center;
  }
}

.page-about .about-team-media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--gray);
}

.page-about .about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-team-body h3 {
  margin: 0 0 12px;
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-team-body > p {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-roles {
  display: grid;
  gap: 12px;
}

@media (min-width: 560px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-role {
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: var(--surface-muted);
  border: 1px solid var(--line);
}

.page-about .about-role-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .about-role-name {
  display: block;
  margin-top: 6px;
  font-size: 15px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-role-desc {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 16px;
}

@media (min-width: 780px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-partner {
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
  transition: transform .36s var(--about-nudge), border-color .36s var(--about-nudge), box-shadow .36s var(--about-nudge);
}

.page-about .about-partner:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 194, 168, .5);
  box-shadow: var(--shadow-soft);
}

.page-about .about-partner-num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 26px);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--green);
}

.page-about .about-partner h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--muted);
}

/* ---------- 资质与荣誉 ---------- */
.page-about .about-cred {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

@media (min-width: 760px) {
  .page-about .about-cred {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-cred li {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--white);
  transition: background .3s var(--about-nudge), border-color .3s var(--about-nudge);
}

.page-about .about-cred li:hover {
  background: var(--gray);
  border-color: rgba(255, 107, 53, .45);
}

.page-about .about-cred-name {
  font-size: 15px;
  font-weight: 800;
  color: var(--green);
  line-height: 1.5;
}

.page-about .about-cred-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  padding: clamp(46px, 6vw, 82px) 0;
  color: var(--white);
  background:
    radial-gradient(80% 120% at 12% 0%, rgba(0, 194, 168, .2), transparent 58%),
    linear-gradient(120deg, var(--green-deep) 0%, var(--green) 100%);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -8%;
  top: -30%;
  width: 46%;
  height: 160%;
  pointer-events: none;
  background: repeating-linear-gradient(105deg, rgba(255, 255, 255, .05) 0 2px, transparent 2px 24px);
}

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

@media (min-width: 900px) {
  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1.25fr) auto;
    gap: 40px;
    align-items: center;
  }
}

.page-about .about-cta-copy h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.18;
  letter-spacing: -.02em;
  font-weight: 800;
}

.page-about .about-cta-copy p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .82);
}

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

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero-visual,
  .page-about .about-card,
  .page-about .about-partner,
  .page-about .about-cred li {
    transition: none;
  }

  .page-about .about-hero-visual {
    transform: none;
  }

  .page-about .about-card:hover,
  .page-about .about-partner:hover {
    transform: none;
  }
}