.page-about {
  --about-text: #D7DDF0;
  --about-dim: #94A3C9;
  --about-line: rgba(169, 182, 217, 0.22);
  --about-gap: clamp(28px, 4vw, 52px);
  color: var(--about-text);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about a {
  color: var(--se-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(224, 164, 59, 0.35);
  transition: color 160ms var(--se-ease), border-color 160ms var(--se-ease);
}

.page-about a:hover {
  color: var(--se-gold-soft);
  border-color: var(--se-gold-soft);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(20px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(32px, 5vw, 64px) clamp(24px, 3.5vw, 44px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 460px;
  background:
    radial-gradient(58% 78% at 14% 0%, rgba(63, 191, 160, 0.20), transparent 72%),
    radial-gradient(52% 68% at 86% 8%, rgba(224, 164, 59, 0.16), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(169, 182, 217, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(169, 182, 217, 0.07) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 76%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  font-size: clamp(2rem, 5.4vw, 4.1rem);
  line-height: 1.14;
  letter-spacing: -0.025em;
  max-width: 20ch;
  margin: clamp(12px, 1.6vw, 20px) 0 0;
}

.page-about .about-hero__lead {
  max-width: 44ch;
  margin: clamp(16px, 2.2vw, 26px) 0 0;
  color: var(--about-text);
  font-size: clamp(0.98rem, 1.4vw, 1.08rem);
  line-height: 1.78;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  list-style: none;
  margin: clamp(30px, 4vw, 52px) 0 0;
  padding: 0;
}

.page-about .about-stat {
  padding-left: 14px;
  border-left: 2px solid rgba(63, 191, 160, 0.5);
}

.page-about .about-stat:nth-child(2) {
  border-left-color: rgba(224, 164, 59, 0.5);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  font-weight: 700;
  color: var(--se-paper);
  letter-spacing: 0.02em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--about-dim);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: block;
  margin-top: clamp(24px, 3.5vw, 40px);
}

/* ---------- 左侧锚点 ---------- */
.page-about .about-anchor {
  margin-bottom: clamp(24px, 4vw, 8px);
}

.page-about .about-anchor .se-anchor {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 14px;
  border-bottom: 1px solid var(--about-line);
  scrollbar-width: none;
}

.page-about .about-anchor .se-anchor::-webkit-scrollbar {
  height: 0;
}

.page-about .about-anchor .se-anchor__title {
  display: none;
}

.page-about .about-anchor .se-anchor__link {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--about-line);
  font-size: 0.82rem;
  line-height: 1.2;
  color: var(--about-dim);
  text-decoration: none;
  transition: color 160ms var(--se-ease), border-color 160ms var(--se-ease), background-color 160ms var(--se-ease);
}

.page-about .about-anchor .se-anchor__link:hover,
.page-about .about-anchor .se-anchor__link[aria-current="true"] {
  color: var(--se-gold);
  border-color: rgba(224, 164, 59, 0.55);
  background: rgba(224, 164, 59, 0.09);
}

/* ---------- 章节通用 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  padding-block: clamp(40px, 6vw, 76px);
}

.page-about .about-chapter:first-child {
  padding-top: clamp(10px, 1.5vw, 18px);
}

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

.page-about .about-chapter__title {
  font-size: clamp(1.4rem, 3vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  max-width: 26ch;
  margin: clamp(10px, 1.4vw, 16px) 0 0;
}

.page-about .about-prose {
  max-width: 40ch;
  margin: clamp(14px, 2vw, 20px) 0 0;
  color: var(--about-text);
  font-size: 0.97rem;
  line-height: 1.85;
}

.page-about .about-prose--lead {
  max-width: 42ch;
  font-size: 1.02rem;
}

/* ---------- 三个常年动作 ---------- */
.page-about .about-pillars {
  list-style: none;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-pillar {
  position: relative;
  padding: 20px 20px 20px 24px;
  border: 1px solid var(--about-line);
  border-radius: 14px;
  background: linear-gradient(96deg, rgba(63, 191, 160, 0.10), rgba(63, 191, 160, 0) 58%);
}

.page-about .about-pillar::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--se-jade), var(--se-jade-dark));
}

.page-about .about-pillar__idx {
  margin: 0;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--se-jade);
}

.page-about .about-pillar__title {
  margin: 8px 0 0;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--se-paper);
}

.page-about .about-pillar__text {
  margin: 8px 0 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--about-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 28px;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  padding: 16px 18px;
  border: 1px solid var(--about-line);
  border-radius: 14px;
  background: rgba(27, 42, 91, 0.55);
  transition: border-color 160ms var(--se-ease), transform 160ms var(--se-ease);
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-role__count {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--se-gold);
  line-height: 1;
}

.page-about .about-role__name {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--se-paper);
}

.page-about .about-role__note {
  margin: 10px 0 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--about-dim);
  transition: color 160ms var(--se-ease);
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  object-fit: cover;
  border: 1px solid var(--about-line);
}

.page-about .about-team__figure figcaption {
  margin-top: 12px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--about-dim);
}

/* ---------- 六个栏目 ---------- */
.page-about .about-channels {
  list-style: none;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-channel {
  padding: 20px 22px;
  border: 1px solid var(--about-line);
  border-radius: 16px;
  background: rgba(46, 67, 126, 0.24);
  transition: transform 160ms var(--se-ease), border-color 160ms var(--se-ease), background-color 160ms var(--se-ease);
}

.page-about .about-channel__idx {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--se-jade);
}

.page-about .about-channel__name {
  margin: 8px 0 0;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--se-paper);
}

.page-about .about-channel__desc {
  margin: 9px 0 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--about-dim);
}

/* ---------- 结构演进 ---------- */
.page-about .about-evo__figure {
  margin: clamp(24px, 3.5vw, 38px) 0 0;
}

.page-about .about-evo__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  object-fit: cover;
  border: 1px solid var(--about-line);
}

.page-about .about-evo__figure figcaption {
  margin-top: 12px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--about-dim);
}

.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--se-jade), rgba(63, 191, 160, 0.08));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 3.6vw, 42px);
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -30px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--se-ink-deep);
  border: 2px solid var(--se-jade);
  box-shadow: 0 0 0 5px rgba(63, 191, 160, 0.12);
  transition: box-shadow 160ms var(--se-ease), border-color 160ms var(--se-ease);
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  border-color: var(--se-gold);
  box-shadow: 0 0 0 7px rgba(224, 164, 59, 0.14);
}

.page-about .about-timeline__ver {
  margin: 0;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--se-gold);
}

.page-about .about-timeline__title {
  margin: 8px 0 0;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--se-paper);
}

.page-about .about-timeline__text {
  max-width: 40ch;
  margin: 8px 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .about-evo__result {
  margin-top: clamp(26px, 3.6vw, 42px);
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid rgba(224, 164, 59, 0.34);
  border-radius: 16px;
  background:
    radial-gradient(70% 120% at 8% 0%, rgba(224, 164, 59, 0.14), transparent 68%),
    rgba(16, 26, 58, 0.6);
}

.page-about .about-evo__metric {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.page-about .about-evo__from {
  font-size: clamp(1.6rem, 3.4vw, 2.1rem);
  font-weight: 700;
  color: var(--about-dim);
  text-decoration: line-through;
  text-decoration-color: rgba(148, 163, 201, 0.5);
}

.page-about .about-evo__arrow {
  font-size: 1.15rem;
  color: var(--se-gold);
}

.page-about .about-evo__to {
  font-size: clamp(2rem, 4.4vw, 2.9rem);
  font-weight: 700;
  color: var(--se-gold-soft);
}

.page-about .about-evo__label {
  margin: 14px 0 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--about-dim);
  max-width: 46ch;
}

/* ---------- 访客反馈 ---------- */
.page-about .about-research {
  display: grid;
  gap: 18px;
  margin-top: clamp(24px, 3.5vw, 38px);
}

.page-about .about-card {
  border-radius: 16px;
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .about-card--paper {
  background: var(--se-paper);
  color: var(--se-black);
  border: 1px solid rgba(5, 10, 24, 0.08);
  box-shadow: 0 14px 30px rgba(5, 10, 24, 0.28);
}

.page-about .about-card__num {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: clamp(2.2rem, 5vw, 3.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--se-ink);
  letter-spacing: -0.02em;
}

.page-about .about-card__num .se-mono {
  font-size: inherit;
  font-weight: 700;
}

.page-about .about-card__unit {
  font-size: 0.95rem;
  font-weight: 600;
  color: #4A5578;
}

.page-about .about-card__label {
  margin: 12px 0 0;
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--se-black);
}

.page-about .about-card__note {
  margin: 8px 0 0;
  font-size: 0.84rem;
  line-height: 1.72;
  color: #3C4566;
}

.page-about .about-research__note {
  padding: 20px 22px;
  border: 1px dashed rgba(63, 191, 160, 0.4);
  border-radius: 16px;
  background: rgba(31, 122, 103, 0.1);
}

.page-about .about-research__tag {
  margin: 0;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--se-jade);
}

.page-about .about-research__note .about-prose {
  margin-top: 10px;
  color: var(--about-text);
}

/* ---------- 服务范围与联系 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 26px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-conclusion {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .about-coverage__figure {
  margin: 0;
}

.page-about .about-coverage__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  object-fit: cover;
  border: 1px solid var(--about-line);
}

.page-about .about-coverage__figure figcaption {
  margin-top: 12px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--about-dim);
}

.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin-top: clamp(30px, 4.4vw, 52px);
  padding: clamp(22px, 3.2vw, 34px);
  border-radius: 18px;
  border: 1px solid var(--about-line);
  background:
    radial-gradient(84% 130% at 100% 0%, rgba(63, 191, 160, 0.16), transparent 66%),
    rgba(27, 42, 91, 0.7);
}

.page-about .about-cta__tag {
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--se-jade);
}

.page-about .about-cta__line {
  margin: 12px 0 0;
  font-size: clamp(1rem, 1.8vw, 1.16rem);
  font-weight: 700;
  line-height: 1.55;
  color: var(--se-paper);
  max-width: 32ch;
}

.page-about .about-cta__meta {
  margin: 14px 0 0;
  font-size: 0.82rem;
  color: var(--about-dim);
}

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

.page-about .about-cta__actions .se-btn {
  border-bottom: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 24px;
  }

  .page-about .about-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 24px;
  }

  .page-about .about-channel:nth-child(even) {
    margin-top: 22px;
  }

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

  .page-about .about-research__note {
    grid-column: 1 / -1;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 42px;
    align-items: start;
  }

  .page-about .about-team__figure {
    position: sticky;
    top: 108px;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-coverage__figure {
    position: sticky;
    top: 108px;
  }

  .page-about .about-role:hover {
    border-color: rgba(224, 164, 59, 0.45);
    transform: translateY(-3px);
  }

  .page-about .about-role:hover .about-role__note {
    color: var(--about-text);
  }

  .page-about .about-channel:hover {
    transform: translateY(-4px);
    border-color: rgba(224, 164, 59, 0.45);
    background: rgba(46, 67, 126, 0.4);
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
    margin-top: clamp(32px, 4.5vw, 56px);
  }

  .page-about .about-anchor {
    position: sticky;
    top: 104px;
    margin-bottom: 0;
    align-self: start;
  }

  .page-about .about-anchor .se-anchor {
    flex-direction: column;
    flex-wrap: wrap;
    overflow: visible;
    gap: 2px;
    padding: 0 0 0 16px;
    border-bottom: 0;
    border-left: 1px solid var(--about-line);
  }

  .page-about .about-anchor .se-anchor__title {
    display: block;
    margin: 0 0 10px;
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    color: var(--about-dim);
  }

  .page-about .about-anchor .se-anchor__link {
    padding: 7px 0;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: 0.86rem;
  }

  .page-about .about-anchor .se-anchor__link:hover,
  .page-about .about-anchor .se-anchor__link[aria-current="true"] {
    background: none;
    color: var(--se-gold);
  }

  .page-about .about-hero__lead {
    max-width: 46ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-channel,
  .page-about .about-role,
  .page-about .about-timeline__dot {
    transition: none;
  }

  .page-about .about-channel:hover,
  .page-about .about-role:hover {
    transform: none;
  }
}