.page-about {
  --about-gutter: 18px;
  --about-line: rgba(16, 34, 47, 0.16);
  background: var(--foam-50);
  color: var(--ink-900);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep-900);
  color: var(--foam-50);
  padding: 24px 0 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -18%;
  right: -14%;
  width: 68%;
  height: 140%;
  background: repeating-linear-gradient(
    115deg,
    rgba(255, 107, 74, 0.16) 0 8px,
    transparent 8px 24px
  );
  transform: skewX(-8deg);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumbs {
  margin: 0 0 20px;
}

.page-about .about-hero .breadcrumbs__link,
.page-about .about-hero .breadcrumbs__sep {
  color: var(--deep-300);
}

.page-about .about-hero .breadcrumbs__current {
  color: var(--foam-50);
}

.page-about .about-hero .eyebrow {
  color: var(--coral-200);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 16px 0 30px;
  max-width: 56ch;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: rgba(247, 245, 239, 0.86);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--deep-700);
}

.page-about .about-fact {
  padding: 14px 12px 16px 0;
  border-bottom: 2px solid var(--deep-700);
  min-width: 0;
}

.page-about .about-fact:nth-child(even) {
  padding-left: 14px;
  border-left: 2px solid var(--deep-700);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 600;
  line-height: 1.1;
  color: var(--sand-400);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--deep-300);
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding: 48px 0;
}

.page-about .section-head {
  margin-bottom: 24px;
}

.page-about .section-head__title {
  font-size: clamp(1.5rem, 4.4vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .section-head__meta {
  font-family: var(--font-mono);
  color: var(--clay-500);
}

.page-about .about-band--tint {
  background: rgba(232, 183, 91, 0.15);
}

.page-about .about-split {
  gap: 30px;
  align-items: start;
}

.page-about .about-lead {
  margin: 0 0 22px;
  max-width: 60ch;
  font-size: var(--fs-17);
  line-height: 1.8;
}

.page-about .about-note {
  margin: 26px 0 0;
  padding-left: 14px;
  border-left: 4px solid var(--clay-500);
  max-width: 66ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-900);
}

.page-about .about-aside {
  margin: 16px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--rock-400);
}

.page-about .about-linkline {
  margin: 20px 0 0;
}

.page-about .about-inline-link {
  color: var(--deep-700);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 3px solid var(--coral-500);
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover {
  color: var(--coral-500);
}

/* ---------- 路标块 ---------- */
.page-about .signpost {
  border: var(--bw-bold) solid var(--ink-900);
  box-shadow: var(--shadow-hard);
  background: var(--foam-50);
}

.page-about .signpost__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 16px;
  border-bottom: var(--bw) solid var(--ink-900);
}

.page-about .signpost__label {
  font-size: var(--fs-14);
  font-weight: 700;
}

.page-about .signpost__arrow {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--coral-500);
}

.page-about .signpost__target {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px;
  background: var(--deep-900);
  color: var(--foam-50);
  font-size: var(--fs-14);
  font-weight: 700;
}

.page-about .signpost__target .signpost__arrow {
  color: var(--sand-400);
}

/* ---------- 岗位分工 ---------- */
.page-about .role-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.page-about .role__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .role__name {
  font-size: var(--fs-17);
  font-weight: 800;
}

.page-about .role__num {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--clay-500);
  font-variant-numeric: tabular-nums;
}

.page-about .role__bar {
  margin: 9px 0 8px;
  height: 14px;
  border: var(--bw) solid var(--ink-900);
  background: var(--foam-50);
  overflow: hidden;
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .role__fill {
  display: block;
  height: 100%;
}

.page-about .role__fill--edit { width: 31.6%; background: var(--coral-500); }
.page-about .role__fill--check { width: 23.7%; background: var(--moss-500); }
.page-about .role__fill--tech { width: 28.9%; background: var(--deep-700); }
.page-about .role__fill--support { width: 15.8%; background: var(--sand-400); }

.page-about .role__duty {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--rock-400);
}

.page-about .role:hover .role__bar,
.page-about .role:focus-within .role__bar {
  box-shadow: var(--shadow-soft);
  transform: translate(-2px, -2px);
}

.page-about .role:hover .role__name,
.page-about .role:focus-within .role__name {
  color: var(--deep-700);
}

.page-about .about-team-media {
  margin: 0;
}

/* ---------- 流程阶梯 ---------- */
.page-about .flow {
  display: grid;
  gap: 0;
}

.page-about .flow__step {
  border: var(--bw-bold) solid var(--ink-900);
  background: var(--foam-50);
  box-shadow: var(--shadow-hard);
  padding: 20px 18px;
}

.page-about .flow__step + .flow__step {
  margin-top: 24px;
}

.page-about .flow__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--clay-500);
}

.page-about .flow__title {
  margin: 8px 0 10px;
  font-size: var(--fs-21);
  line-height: 1.35;
}

.page-about .flow__body {
  margin: 0;
  max-width: 58ch;
  font-size: var(--fs-17);
  line-height: 1.8;
}

.page-about .flow__fields {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__field {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  padding: 5px 9px;
  border: 1.5px solid var(--deep-700);
  background: rgba(127, 176, 201, 0.2);
  color: var(--deep-900);
}

/* ---------- 值守班次 ---------- */
.page-about .shift-band {
  border: var(--bw-bold) solid var(--ink-900);
  box-shadow: var(--shadow-hard);
  background: var(--foam-50);
}

.page-about .shift {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 14px;
  border-bottom: var(--bw) solid var(--ink-900);
}

.page-about .shift:last-child {
  border-bottom: 0;
}

.page-about .shift__name {
  margin: 0;
  align-self: start;
  padding-left: 10px;
  border-left: 5px solid var(--sand-400);
  font-size: var(--fs-14);
  font-weight: 800;
  line-height: 1.5;
}

.page-about .shift--eve .shift__name {
  border-left-color: var(--coral-500);
}

.page-about .shift--night .shift__name {
  border-left-color: var(--deep-700);
}

.page-about .shift__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
}

/* ---------- 时间线 ---------- */
.page-about .tl-wrap {
  position: relative;
}

.page-about .tl-bg {
  display: none;
}

.page-about .tl-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .tl-index a {
  display: inline-block;
  padding: 6px 11px;
  border: 1.5px solid var(--ink-900);
  background: var(--foam-50);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  text-decoration: none;
  font-variant-numeric: tabular-nums;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .tl-index a:hover,
.page-about .tl-index a:focus-visible {
  background: var(--coral-200);
}

.page-about .tl {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
}

.page-about .tl__item {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: var(--bw) solid var(--about-line);
  scroll-margin-top: 88px;
}

.page-about .tl__item:first-child {
  border-top: 3px solid var(--ink-900);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: var(--fs-21);
  font-weight: 600;
  line-height: 1.2;
  color: var(--clay-500);
  font-variant-numeric: tabular-nums;
  transition: color var(--dur) var(--ease);
}

.page-about .tl__item:hover .tl__year,
.page-about .tl__item:target .tl__year {
  color: var(--coral-500);
}

.page-about .tl__title {
  margin: 0 0 6px;
  font-size: var(--fs-17);
  font-weight: 800;
  line-height: 1.4;
}

.page-about .tl__text {
  margin: 0;
  max-width: 62ch;
  font-size: var(--fs-14);
  line-height: 1.85;
}

/* ---------- 协作生态 ---------- */
.page-about .partner-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0 0 24px;
}

.page-about .partner-stat {
  padding: 4px 0 4px 14px;
  border-left: 6px solid var(--coral-500);
}

.page-about .partner-stat:nth-child(2) {
  border-left-color: var(--moss-500);
}

.page-about .partner-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-38);
  font-weight: 600;
  line-height: 1;
  color: var(--deep-900);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-stat__label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-14);
  color: var(--rock-400);
}

.page-about .about-partner-media {
  margin: 26px 0 0;
}

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

.page-about .media__caption {
  margin-top: 10px;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--rock-400);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  background: var(--deep-900);
  color: var(--foam-50);
  padding: 40px 0 44px;
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4.2vw, 2rem);
  line-height: 1.25;
}

.page-about .about-cta__lead {
  margin: 0 0 22px;
  max-width: 52ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: rgba(247, 245, 239, 0.84);
}

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

.page-about .about-cta__link {
  display: inline-block;
  padding: 12px 18px;
  border: 2px solid var(--foam-50);
  color: var(--foam-50);
  font-size: var(--fs-14);
  font-weight: 700;
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  background: var(--foam-50);
  color: var(--deep-900);
  transform: translateY(-2px);
}

.page-about .about-cta__link--primary {
  background: var(--coral-500);
  border-color: var(--coral-500);
  color: var(--ink-900);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__link--primary:hover,
.page-about .about-cta__link--primary:focus-visible {
  background: var(--coral-200);
  border-color: var(--coral-200);
  color: var(--ink-900);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero {
    padding-top: 32px;
  }

  .page-about .about-hero__lead {
    margin-bottom: 40px;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-fact {
    padding: 20px 18px 24px;
    border-bottom: 0;
    border-left: 2px solid var(--deep-700);
  }

  .page-about .about-fact:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-fact:nth-child(even) {
    padding-left: 18px;
  }

  .page-about .section {
    padding: 64px 0;
  }

  .page-about .section-head {
    margin-bottom: 30px;
  }

  .page-about .flow__step {
    padding: 24px 22px;
  }

  .page-about .shift {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 18px;
    padding: 20px 18px;
  }

  .page-about .tl__item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 22px;
    padding: 20px 0;
  }

  .page-about .about-partner-media {
    margin-top: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .section {
    padding: 78px 0;
  }

  .page-about .about-split {
    gap: 44px;
  }

  .page-about .flow__step--two {
    margin-left: 64px;
  }

  .page-about .tl-bg {
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    width: 34%;
    max-width: 300px;
    height: auto;
    opacity: 0.12;
    pointer-events: none;
  }

  .page-about .tl {
    padding-right: 22%;
  }

  .page-about .about-cta {
    padding: 56px 0 60px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__lead {
    font-size: var(--fs-21);
  }

  .page-about .about-split {
    gap: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role__bar,
  .page-about .role__name,
  .page-about .tl__year,
  .page-about .tl-index a,
  .page-about .about-cta__link {
    transition: none;
  }

  .page-about .about-cta__link:hover,
  .page-about .about-cta__link:focus-visible,
  .page-about .role:hover .role__bar,
  .page-about .role:focus-within .role__bar {
    transform: none;
  }
}