.page-about {
  background: var(--ink);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 通用排版 ---------- */

.page-about .ab-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 5.2vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  color: var(--white);
}

.page-about .ab-h2--dark {
  color: var(--umber);
}

.page-about .ab-lede {
  margin: 18px 0 0;
  font-size: clamp(0.95rem, 2.4vw, 1.0625rem);
  line-height: 1.8;
  color: rgba(232, 241, 238, 0.82);
  max-width: 62ch;
}

.page-about .ab-lede--dark {
  color: rgba(42, 30, 22, 0.78);
}

.page-about .ab-body {
  margin: 16px 0 0;
  font-size: 1rem;
  line-height: 1.82;
  color: rgba(232, 241, 238, 0.78);
  max-width: 68ch;
}

.page-about .ab-body--tight {
  max-width: 58ch;
}

.page-about .ab-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  padding-bottom: 1px;
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--orange);
}

.page-about .ab-link--dark {
  color: var(--red);
  border-bottom-color: rgba(216, 64, 44, 0.45);
}

.page-about .ab-link--dark:hover,
.page-about .ab-link--dark:focus-visible {
  color: var(--umber);
  border-bottom-color: var(--umber);
}

.page-about .ab-section-head {
  max-width: 76ch;
}

.page-about .ab-module-id--dark {
  color: var(--umber);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: 40px 0 0;
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -40px -20% auto -20%;
  height: 340px;
  background: radial-gradient(60% 100% at 22% 0%, rgba(31, 224, 192, 0.14), transparent 70%),
    radial-gradient(50% 90% at 88% 12%, rgba(255, 106, 26, 0.1), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 420px;
  background-image:
    linear-gradient(to right, rgba(155, 167, 162, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(155, 167, 162, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .ab-hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 8.4vw, 4.6rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 20px 0 0;
  color: var(--white);
}

.page-about .ab-hero-lede {
  margin: 24px 0 0;
  font-size: clamp(0.95rem, 2.5vw, 1.0625rem);
  line-height: 1.85;
  color: rgba(232, 241, 238, 0.8);
  max-width: 66ch;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-stat {
  background: var(--ink);
  padding: 20px 16px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .ab-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stat-num--cyan {
  color: var(--cyan);
}

.page-about .ab-stat-num--orange {
  color: var(--orange);
}

.page-about .ab-stat-lbl {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--silver);
}

/* ---------- 自述 ---------- */

.page-about .ab-intro-grid {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .ab-figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  overflow: hidden;
  background: var(--coal);
}

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

.page-about .ab-figure--axis {
  border-left: 0;
  border-right: 0;
  clip-path: none;
  margin-top: 32px;
}

.page-about .ab-figure--axis img {
  aspect-ratio: 8 / 3;
}

.page-about .ab-figure-cap {
  padding: 12px 16px 14px;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--silver);
  letter-spacing: 0.02em;
  background: var(--coal);
  border-top: 1px solid var(--line);
}

/* ---------- 团队 ---------- */

.page-about .ab-team-grid {
  margin-top: 40px;
  display: grid;
  gap: 24px;
}

.page-about .ab-role {
  background: var(--coal);
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 24px 20px 26px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .ab-ring {
  --p: 40;
  --ring-color: var(--cyan);
  position: relative;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: conic-gradient(
    var(--ring-color) calc(var(--p) * 1%),
    rgba(232, 241, 238, 0.09) 0
  );
  display: grid;
  place-items: center;
}

.page-about .ab-ring::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  background: var(--coal);
}

.page-about .ab-ring-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1;
}

.page-about .ab-ring-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-ring-lbl {
  margin-top: 4px;
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--silver);
}

.page-about .ab-role-title {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-role-body {
  margin: 12px 0 0;
  font-size: 0.9375rem;
  line-height: 1.82;
  color: rgba(232, 241, 238, 0.76);
}

/* ---------- 覆盖范围 ---------- */

.page-about .ab-cover {
  position: relative;
  margin-top: 72px;
  padding: 56px 0 64px;
  background: var(--coal);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-cover-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.28;
}

.page-about .ab-cover-bg img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  object-position: center;
}

.page-about .ab-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(180deg, rgba(20, 24, 26, 0.86), rgba(11, 31, 23, 0.94) 62%, var(--ink)),
    repeating-linear-gradient(45deg, rgba(155, 167, 162, 0.05) 0 1px, transparent 1px 14px);
  pointer-events: none;
}

.page-about .ab-cover-inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-cities {
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-city {
  background: rgba(11, 31, 23, 0.92);
  padding: 12px 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-left: 2px solid transparent;
}

.page-about .ab-city-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .ab-city-courts {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--silver);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-city--hot {
  border-left-color: var(--orange);
  background: rgba(255, 106, 26, 0.1);
}

.page-about .ab-city--hot .ab-city-name {
  color: var(--orange);
}

.page-about .ab-city--south {
  border-left-color: var(--cyan);
  background: rgba(31, 224, 192, 0.08);
}

.page-about .ab-city--south .ab-city-name {
  color: var(--cyan);
}

.page-about .ab-spots {
  margin-top: 28px;
  display: grid;
  gap: 16px;
}

.page-about .ab-spot {
  position: relative;
  padding: 22px 20px 24px;
  background: rgba(11, 31, 23, 0.9);
  border: 1px solid var(--line);
  border-top: 2px solid var(--silver);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .ab-spot--hot {
  border-top-color: var(--orange);
}

.page-about .ab-spot--south {
  border-top-color: var(--cyan);
}

.page-about .ab-spot-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-spot-body {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(232, 241, 238, 0.76);
}

/* ---------- 时间轴 ---------- */

.page-about .ab-axis {
  padding-top: 60px;
}

.page-about .ab-axis-rail {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  overflow-x: auto;
  padding: 0 var(--gutter) 26px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.page-about .ab-axis-rail::-webkit-scrollbar {
  height: 4px;
}

.page-about .ab-axis-rail::-webkit-scrollbar-thumb {
  background: var(--line-strong);
}

.page-about .ab-axis-card {
  flex: 0 0 82%;
  max-width: 320px;
  scroll-snap-align: start;
  background: var(--coal);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line-cyan);
  scroll-margin-left: var(--gutter);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: border-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .ab-axis-card[open] {
  border-left-color: var(--orange);
  background: #171D1F;
}

.page-about .ab-axis-card > summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 18px 18px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
}

.page-about .ab-axis-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-axis-card > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -4px;
}

.page-about .ab-axis-idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--silver);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-axis-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-axis-mark {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-about .ab-axis-mark::before,
.page-about .ab-axis-mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 220ms var(--ease), opacity 220ms var(--ease);
}

.page-about .ab-axis-mark::before {
  top: 50%;
  left: 0;
  width: 14px;
  height: 1px;
  transform: translateY(-50%);
}

.page-about .ab-axis-mark::after {
  left: 50%;
  top: 0;
  width: 1px;
  height: 14px;
  transform: translateX(-50%);
}

.page-about .ab-axis-card[open] .ab-axis-mark::after {
  opacity: 0;
  transform: translateX(-50%) rotate(90deg);
}

.page-about .ab-axis-body {
  margin: 0;
  padding: 0 18px 20px;
  font-size: 0.875rem;
  line-height: 1.8;
  color: rgba(232, 241, 238, 0.74);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .ab-axis-foot {
  margin-top: 8px;
}

/* ---------- 流程（奶油底） ---------- */

.page-about .ab-flow {
  margin-top: 72px;
  background: var(--cream);
  color: var(--umber);
  padding-bottom: 64px;
  border-top: 1px solid rgba(42, 30, 22, 0.15);
  border-bottom: 1px solid rgba(42, 30, 22, 0.15);
}

.page-about .ab-flow .module-id {
  color: var(--umber);
}

.page-about .ab-flow .module-id::before,
.page-about .ab-module-id--dark::before {
  background: var(--red);
}

.page-about .ab-steps {
  position: relative;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
  counter-reset: none;
}

.page-about .ab-step {
  position: relative;
  padding: 22px 20px 24px;
  background: #FBF6EA;
  border: 1px solid rgba(42, 30, 22, 0.16);
  border-top: 3px solid var(--red);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .ab-step-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-step-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.1875rem;
  letter-spacing: -0.01em;
  color: var(--umber);
}

.page-about .ab-step-body {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(42, 30, 22, 0.78);
}

.page-about .ab-step-time {
  display: inline-block;
  margin-top: 14px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--umber);
  background: rgba(42, 30, 22, 0.07);
  border-left: 2px solid var(--red);
}

.page-about .ab-flow-note {
  margin: 32px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(42, 30, 22, 0.78);
  max-width: 60ch;
}

/* ---------- 合作伙伴 ---------- */

.page-about .ab-partner-grid {
  margin-top: 40px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-partner {
  background: var(--ink);
  padding: 24px 20px 26px;
  border-top: 2px solid transparent;
}

.page-about .ab-partner:nth-child(1) {
  border-top-color: var(--cyan);
}

.page-about .ab-partner:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .ab-partner:nth-child(3) {
  border-top-color: var(--red);
}

.page-about .ab-partner:nth-child(4) {
  border-top-color: var(--silver);
}

.page-about .ab-partner-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5.4vw, 2.125rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-partner-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.0625rem;
  color: var(--silver);
  letter-spacing: 0.01em;
}

.page-about .ab-partner-body {
  margin: 12px 0 0;
  font-size: 0.9375rem;
  line-height: 1.82;
  color: rgba(232, 241, 238, 0.74);
}

.page-about .ab-join {
  margin-top: 32px;
  padding: 26px 22px 28px;
  background: linear-gradient(120deg, rgba(31, 224, 192, 0.1), rgba(255, 106, 26, 0.08));
  border: 1px solid var(--line-cyan);
  display: grid;
  gap: 20px;
  align-items: center;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .ab-join-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.1875rem, 4vw, 1.5rem);
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-join-body {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(232, 241, 238, 0.78);
}

.page-about .ab-join .btn {
  justify-self: start;
}

/* ---------- 联系 ---------- */

.page-about .ab-contact {
  padding-bottom: 72px;
}

.page-about .ab-contact-grid {
  display: grid;
  gap: 32px;
  align-items: start;
}

.page-about .ab-contact-copy .btn {
  margin-top: 26px;
}

.page-about .ab-contact-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-contact-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-contact-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--silver);
  text-transform: uppercase;
}

.page-about .ab-contact-val {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--white);
  word-break: break-word;
}

.page-about .ab-contact-row:nth-child(1) .ab-contact-val,
.page-about .ab-contact-row:nth-child(2) .ab-contact-val {
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .ab-hero {
    padding-top: 56px;
  }

  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stat {
    padding: 26px 20px 28px;
  }

  .page-about .ab-cities {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .ab-contact-row {
    grid-template-columns: 160px 1fr;
    align-items: baseline;
    gap: 16px;
  }

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

  .page-about .ab-join {
    grid-template-columns: 1fr auto;
    padding: 30px 28px 32px;
  }

  .page-about .ab-join .btn {
    justify-self: end;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding-top: 64px;
  }

  .page-about .ab-intro-grid {
    grid-template-columns: 1.06fr 0.94fr;
    gap: 56px;
  }

  .page-about .ab-intro-figure {
    position: relative;
    top: 8px;
  }

  .page-about .ab-team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .ab-cover {
    padding: 72px 0 80px;
    margin-top: 88px;
  }

  .page-about .ab-cities {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ab-axis-card {
    flex: 0 0 320px;
  }

  .page-about .ab-axis-rail {
    gap: 18px;
    padding-left: max(var(--gutter), calc((100vw - var(--shell)) / 2 + var(--gutter)));
    padding-right: max(var(--gutter), calc((100vw - var(--shell)) / 2 + var(--gutter)));
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 26px;
    padding-top: 12px;
  }

  .page-about .ab-steps::before {
    content: "";
    position: absolute;
    top: 0;
    left: 6%;
    right: 6%;
    height: 1px;
    background: repeating-linear-gradient(
      90deg,
      rgba(216, 64, 44, 0.5) 0 5px,
      transparent 5px 11px
    );
  }

  .page-about .ab-step:nth-child(even) {
    transform: translateY(26px);
  }

  .page-about .ab-partner-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-contact-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
  }

  .page-about .ab-flow {
    margin-top: 88px;
    padding-bottom: 80px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-axis-card,
  .page-about .ab-axis-mark::before,
  .page-about .ab-axis-mark::after {
    transition: none;
  }

  .page-about .ab-step:nth-child(even) {
    transform: none;
  }
}