.page-about {
  --about-rail: 86px;
  --about-col: 660px;
  --about-sand-ink: #0B1B2B;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 5vw, 56px);
  padding-bottom: clamp(24px, 4vw, 44px);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin: 0 0 clamp(26px, 5vw, 52px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.page-about .crumbs a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease);
}

.page-about .crumbs a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-crumbs-sep {
  color: var(--line);
}

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

.page-about .about-hero h1 {
  margin: 16px 0 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 8.4vw, 64px);
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: var(--cold);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  max-width: 54ch;
  font-size: clamp(16px, 2.2vw, 17.5px);
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 5vw, 48px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-figure {
  padding: 16px 16px 18px;
  background: var(--arena);
}

.page-about .about-figure__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-figure__value span {
  margin-left: 3px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  color: var(--steel);
}

.page-about .about-figure__label {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.page-about .about-hero__media {
  margin: 0 0 clamp(8px, 2vw, 20px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--panel);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

/* ---------- 通用媒体 ---------- */
.page-about .media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
  box-shadow: var(--shadow-panel);
}

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

.page-about .media__caption {
  margin: 0;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapters {
  padding-bottom: clamp(24px, 4vw, 48px);
}

.page-about .about-chapter {
  padding-block: clamp(38px, 7vw, 84px);
  border-top: 1px solid var(--line);
}

.page-about .about-chapter__index {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-chapter__num:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-chapter:target .about-chapter__num {
  color: var(--orange);
}

.page-about .about-chapter__body h2 {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 36px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--cold);
}

.page-about .about-chapter__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(19px, 2.6vw, 21px);
  line-height: 1.2;
  color: var(--cold);
}

.page-about .about-chapter__body p {
  margin: 0 0 14px;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

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

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 212, 0.4);
}

.page-about .about-inline-link:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 团队折叠 ---------- */
.page-about .about-teams {
  display: grid;
  gap: 10px;
  margin-top: clamp(22px, 3.4vw, 30px);
}

.page-about .about-team {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-soft);
  padding: 0 clamp(14px, 2.4vw, 20px);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-team:hover {
  border-color: rgba(53, 224, 212, 0.45);
}

.page-about .about-team summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(19px, 3vw, 22px);
  color: var(--cold);
}

.page-about .about-team summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-team[open] summary::after {
  content: "–";
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-team__body {
  padding: 2px 0 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-team__body p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-figure-inline {
  margin: clamp(26px, 4vw, 38px) 0 0;
}

.page-about .about-chapter--flip .about-figure-inline {
  max-width: 520px;
}

/* ---------- 色带 ---------- */
.page-about .about-band {
  padding-block: clamp(30px, 5vw, 56px);
}

.page-about .about-band--moss {
  background: var(--moss);
  border-block: 1px solid rgba(53, 224, 212, 0.16);
}

.page-about .about-band--sand {
  background: var(--sand);
  color: var(--about-sand-ink);
  --line: rgba(11, 27, 43, 0.18);
  --ink-soft: rgba(11, 27, 43, 0.74);
  --ink-faint: rgba(11, 27, 43, 0.52);
  --cyan: #0E6F69;
  --steel: rgba(11, 27, 43, 0.62);
  border-block: 1px solid rgba(11, 27, 43, 0.12);
}

.page-about .about-band--sand .about-chapter__body h2,
.page-about .about-band--sand .about-chapter__body h3 {
  color: var(--about-sand-ink);
}

.page-about .about-band .about-chapter {
  padding-block: 0;
  border-top: 0;
}

/* ---------- 工序时间线 ---------- */
.page-about .about-pipeline {
  list-style: none;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
}

.page-about .about-pipeline__step {
  position: relative;
  margin-left: 6px;
  padding: 0 0 clamp(20px, 3vw, 30px) clamp(26px, 4vw, 36px);
  border-left: 1px solid rgba(234, 241, 246, 0.24);
}

.page-about .about-pipeline__step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-pipeline__step::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--clay);
  box-shadow: 0 0 0 3px rgba(166, 90, 58, 0.22);
}

.page-about .about-pipeline__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-pipeline__step p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  list-style: none;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cadence__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-cadence__name {
  font-family: var(--font-display);
  font-size: clamp(19px, 3vw, 21px);
  color: var(--cold);
}

.page-about .about-cadence__freq {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-cadence__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 合作网络 ---------- */
.page-about .about-network {
  display: grid;
  gap: clamp(20px, 3.4vw, 30px);
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-network__media {
  box-shadow: none;
  border-color: rgba(11, 27, 43, 0.2);
}

.page-about .about-network__text p {
  font-size: 16px;
  line-height: 1.78;
  color: rgba(11, 27, 43, 0.78);
}

.page-about .about-network__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-network__list li {
  padding: 10px 0;
  border-top: 1px solid rgba(11, 27, 43, 0.14);
  font-size: 14.5px;
  color: rgba(11, 27, 43, 0.72);
}

.page-about .about-network__k {
  display: inline-block;
  min-width: 86px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: #A65A3A;
}

/* ---------- 规模 ---------- */
.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3.4vw, 30px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-scale__item {
  padding: 18px 16px;
  background: var(--arena);
}

.page-about .about-scale__value {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(21px, 4vw, 26px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-scale__label {
  margin: 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.page-about .about-honor {
  margin-top: clamp(20px, 3vw, 28px) !important;
  padding-left: 16px;
  border-left: 2px solid var(--clay);
  font-size: 14.5px;
  color: var(--ink-faint);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(38px, 6vw, 72px) clamp(20px, 3vw, 40px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 34px);
  line-height: 1.1;
  color: var(--cold);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
}

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

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cadence__row {
    grid-template-columns: 150px 220px minmax(0, 1fr);
    gap: 4px 22px;
    align-items: baseline;
  }

  .page-about .about-scale {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-network {
    grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, var(--about-col));
    column-gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-chapter__index {
    grid-column: 1;
    grid-row: 1;
    justify-content: flex-end;
    padding-top: 10px;
    margin-bottom: 0;
  }

  .page-about .about-chapter__body {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-chapter--flip {
    grid-template-columns: minmax(0, var(--about-col)) var(--about-rail);
  }

  .page-about .about-chapter--flip .about-chapter__index {
    grid-column: 2;
    justify-content: flex-start;
    padding-left: 4px;
  }

  .page-about .about-chapter--flip .about-chapter__body {
    grid-column: 1;
  }

  .page-about .about-chapter__body h2 {
    max-width: 20ch;
  }

  .page-about .about-chapter__body p {
    max-width: 60ch;
  }

  .page-about .about-cta {
    padding-left: calc(var(--about-rail) + clamp(24px, 4vw, 56px));
  }

  .page-about .about-cta > * {
    max-width: 620px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-chapter__num,
  .page-about .crumbs a {
    transition: none;
  }
}