.page-about {
  background: var(--paper);
  color: var(--ink);
  padding-bottom: clamp(48px, 7vw, 100px);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 3vw, 40px);
  padding-bottom: clamp(28px, 4vw, 56px);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 clamp(18px, 3vw, 32px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 7.4vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.015em;
  margin: clamp(12px, 2vw, 20px) 0 0;
  overflow-wrap: break-word;
}

.page-about .about-lead {
  margin: 0;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.85;
  max-width: 40em;
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
}

.page-about .about-stat {
  padding: 14px 10px 0 0;
  border-right: 1px solid var(--line);
}

.page-about .about-stat:last-child {
  border-right: 0;
  padding-right: 0;
}

.page-about .about-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.8vw, 26px);
  font-weight: 600;
  color: var(--red);
  line-height: 1.1;
}

.page-about .about-stat span {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--gray);
}

.page-about .about-hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

@media (min-width: 940px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: end;
  }
}

/* ---------- 主体骨架：左索引 + 右内容 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  padding-top: clamp(32px, 5vw, 64px);
}

.page-about .about-index {
  border-top: 2px solid var(--ink);
  padding-top: 12px;
}

.page-about .about-index-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gray);
}

.page-about .about-index-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0 0 6px;
  display: flex;
  gap: 16px;
  overflow-x: auto;
}

.page-about .about-index-list a {
  display: inline-flex;
  gap: 7px;
  align-items: baseline;
  white-space: nowrap;
  padding: 6px 0;
  font-size: 13px;
  color: var(--gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

.page-about .about-body > section {
  scroll-margin-top: 96px;
}

.page-about .about-body > section + section {
  margin-top: clamp(56px, 8vw, 104px);
}

.page-about .about-sec-head .index-bar {
  margin: 0;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 12px 0 0;
  max-width: 24em;
}

.page-about .about-sec > p {
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  margin: 16px 0 0;
  max-width: 40em;
}

.page-about .about-sec > p.about-more {
  margin-top: 24px;
  font-size: 14px;
  color: var(--gray);
}

.page-about .about-more a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}

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

.page-about .about-pull {
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 16px 20px;
  border-left: 3px solid var(--purple);
  background: rgba(74, 43, 99, 0.05);
  max-width: 40em;
}

.page-about .about-pull p {
  margin: 0;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.8;
  color: var(--ink);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 164px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 68px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 88px;
  }

  .page-about .about-index-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
}

/* ---------- 02 四组分工 ---------- */
.page-about .team-split {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(24px, 3vw, 34px);
  align-items: start;
}

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

.page-about .team-card {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 16px 18px 18px;
  box-shadow: var(--shadow-1);
  transition: border-color var(--t-mid) ease, box-shadow var(--t-mid) ease;
}

.page-about .team-card:hover {
  border-color: var(--red);
  box-shadow: var(--shadow-2);
}

.page-about .team-card-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .team-coord {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 22px;
  padding: 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--cyan);
  background: var(--blue);
}

.page-about .team-name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .team-desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(16, 19, 23, 0.78);
}

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

.page-about .about-media .media-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray);
}

@media (min-width: 900px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

/* ---------- 03 人群 ---------- */
.page-about .crowd-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .crowd-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 20px 18px 22px;
  transition: border-color var(--t-mid) ease, box-shadow var(--t-mid) ease;
}

.page-about .crowd-card:hover {
  border-color: var(--red);
  box-shadow: var(--shadow-2);
}

.page-about .crowd-tag {
  margin: 0;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--red);
  border: 1px solid var(--line);
  padding: 4px 8px;
}

.page-about .crowd-name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .crowd-body {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(16, 19, 23, 0.78);
}

.page-about .crowd-use {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: rgba(16, 19, 23, 0.78);
}

.page-about .crowd-use-key {
  display: inline-block;
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

@media (min-width: 840px) {
  .page-about .crowd-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 04 赛季覆盖 ---------- */
.page-about .season-split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(24px, 3vw, 34px);
  align-items: start;
}

.page-about .season-text p {
  margin: 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  max-width: 38em;
}

.page-about .season-text p + p {
  margin-top: 16px;
}

.page-about .season-facts {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 18px;
  border-top: 1px solid var(--line-strong);
}

.page-about .season-facts li {
  padding: 12px 0;
  font-size: 13px;
  color: rgba(16, 19, 23, 0.78);
  border-bottom: 1px solid var(--line);
}

.page-about .season-facts .num {
  margin-right: 6px;
  color: var(--red);
  font-weight: 600;
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(32px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .tl-node {
  position: relative;
  padding-top: 24px;
}

.page-about .tl-tick {
  position: absolute;
  top: 1px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--red);
  transition: background var(--t-mid) ease, border-color var(--t-mid) ease;
}

.page-about .tl-node:hover .tl-tick {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .tl-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--red);
}

.page-about .tl-title {
  margin: 6px 0 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .tl-detail {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--gray);
}

@media (min-width: 860px) {
  .page-about .season-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    position: relative;
    border-top: 1px solid var(--line-strong);
    padding-top: 0;
  }

  .page-about .about-timeline::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 7px;
    height: 1px;
    background: var(--line-strong);
  }

  .page-about .tl-node {
    padding: 26px 16px 0 0;
  }

  .page-about .tl-tick {
    top: 2px;
    background: var(--paper);
  }

  .page-about .tl-detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height 220ms ease, opacity 220ms ease, margin-top 220ms ease;
  }

  .page-about .tl-node:hover .tl-detail {
    max-height: 12em;
    opacity: 1;
    margin-top: 8px;
  }
}

@media (hover: none) {
  .page-about .tl-detail {
    max-height: none;
    opacity: 1;
  }
}

/* ---------- 05 更新与支持 ---------- */
.page-about .promise-grid {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .promise-item {
  border-top: 1px solid var(--line-strong);
  padding-top: 14px;
}

.page-about .promise-key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .promise-val {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(16, 19, 23, 0.8);
}

.page-about .about-activity {
  margin-top: clamp(28px, 4vw, 40px);
  padding: 20px 20px 22px;
  background: var(--blue);
  color: var(--on-dark);
}

.page-about .about-activity-title {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--on-dark);
}

.page-about .about-activity .measure {
  margin-top: 14px;
}

.page-about .about-activity .measure-fill {
  width: var(--v, 62%);
}

.page-about .about-activity-note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--on-dark-dim);
}

@media (min-width: 780px) {
  .page-about .promise-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 32px;
  }
}
</main>

.page-about {
  --v: 1rem;
}