.page-about {
  --about-cut: 18px;
  --about-gap: clamp(14px, 2vw, 20px);
  --about-space: clamp(56px, 8vw, 104px);
  background: var(--ink-base);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(36px, 5vw, 64px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -4% auto -4%;
  height: 78%;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.16;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 7.6vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  max-width: 15ch;
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .hero-tiles {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .tile {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--ink-panel);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .tile--a {
  background: linear-gradient(150deg, var(--field-deep), var(--ink-panel) 72%);
}

.page-about .tile--d {
  background: var(--ink-panel);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.page-about .tile__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .tile__num {
  margin: 0;
  font-family: var(--font-mono);
  font-feature-settings: "tnum";
  font-size: clamp(38px, 6vw, 60px);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .tile--d .tile__num {
  color: var(--amber);
}

.page-about .tile__num--sm {
  font-size: clamp(28px, 4.4vw, 40px);
}

.page-about .tile__plus {
  font-size: 0.4em;
  margin-left: 4px;
  color: var(--mist);
  font-weight: 500;
}

.page-about .tile__cap {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .tile--d .btn {
  margin-top: auto;
  align-self: flex-start;
}

/* ---------- 斜切分隔带 ---------- */
.page-about .slash-band {
  height: clamp(36px, 5vw, 64px);
  margin: clamp(20px, 3vw, 32px) -10vw;
  background: linear-gradient(90deg, transparent 4%, var(--mid) 46%, var(--amber) 96%);
  opacity: 0.26;
  transform: skewY(-6deg);
}

.page-about .slash-band--rev {
  transform: skewY(6deg);
  background: linear-gradient(90deg, var(--amber) 4%, var(--mid) 54%, transparent 96%);
  opacity: 0.2;
}

/* ---------- 章节头 ---------- */
.page-about .about-line,
.page-about .about-method,
.page-about .about-team,
.page-about .about-partner,
.page-about .about-legacy {
  padding-block: var(--about-space);
}

.page-about .sec-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(26px, 4vw, 44px);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .sec-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.01em;
}

.page-about .sec-sub {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 52ch;
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 14px;
  bottom: 14px;
  border-left: 1px dashed var(--line);
}

.page-about .tl__item {
  position: relative;
  padding-left: 46px;
  padding-bottom: clamp(26px, 3.6vw, 40px);
}

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

.page-about .tl__node {
  position: absolute;
  left: 0;
  top: 4px;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  border: 2px solid var(--line);
  background: var(--ink-base);
  box-sizing: border-box;
}

.page-about .tl__node--done {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(59, 255, 196, 0.12);
}

.page-about .tl__tag {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .tl__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.24;
}

.page-about .tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 58ch;
}

.page-about .tl__more {
  margin-top: 12px;
  border-left: 2px solid var(--line);
  padding-left: 14px;
}

.page-about .tl__more summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

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

.page-about .tl__more summary::before {
  content: "+";
  font-size: 14px;
  line-height: 1;
}

.page-about .tl__more[open] summary::before {
  content: "−";
}

.page-about .tl__more p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 54ch;
}

.page-about .tl__media {
  margin-top: 16px;
  max-width: 520px;
  overflow: hidden;
}

.page-about .tl__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

/* ---------- 方法 ---------- */
.page-about .method-wrap {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .method-visual {
  margin: 0;
  background: var(--ink-panel);
  padding: 10px 10px 0;
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .method-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .method-visual figcaption {
  padding: 12px 6px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .steps {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 10px;
  -webkit-overflow-scrolling: touch;
}

.page-about .step {
  flex: 0 0 82%;
  scroll-snap-align: start;
  background: var(--ink-panel);
  border-top: 2px solid var(--mid);
  padding: 20px 18px 22px;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .step:last-child {
  border-top-color: var(--amber);
}

.page-about .step__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .step__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.28;
}

.page-about .step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .roles {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

.page-about .role {
  background: var(--ink-panel);
  padding: 22px 20px 24px;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .role--wide {
  background: linear-gradient(160deg, var(--field-deep), var(--ink-panel) 78%);
}

.page-about .role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 42px;
  background: var(--cyan);
}

.page-about .role__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--white);
}

.page-about .role__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .partner {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

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

.page-about .pstat {
  background: var(--ink-panel);
  padding: 20px 18px;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .pstat__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  color: var(--amber);
}

.page-about .pstat__cap {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .partner__body h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 26px);
}

.page-about .partner__body p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 60ch;
}

.page-about .partner__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .partner__list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--white);
}

.page-about .partner__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 2px;
  background: var(--cyan);
}

/* ---------- 积累 ---------- */
.page-about .legacy {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

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

.page-about .lcard {
  background: var(--ink-panel);
  border-bottom: 2px solid var(--line);
  padding: 18px 16px 20px;
}

.page-about .lcard:nth-child(2n) {
  transform: translateY(12px);
}

.page-about .lcard__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .lcard__num span {
  font-size: 0.42em;
  margin-left: 3px;
  color: var(--mist);
  font-weight: 500;
}

.page-about .lcard__cap {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .legacy__note h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 26px);
}

.page-about .legacy__note p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
  max-width: 58ch;
}

.page-about .legacy__note .btn {
  margin-top: 6px;
}

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  padding-block: clamp(40px, 6vw, 72px) clamp(56px, 8vw, 96px);
}

.page-about .closing {
  position: relative;
  background: var(--field-deep);
  padding: clamp(26px, 4vw, 48px);
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
  overflow: hidden;
}

.page-about .closing::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px);
  background-size: 100% 28px;
  opacity: 0.35;
  pointer-events: none;
}

.page-about .closing__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .closing h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 1.06;
  letter-spacing: -0.01em;
}

.page-about .closing__text p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
  max-width: 56ch;
}

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

.page-about .closing__visual {
  margin: 0;
  align-self: end;
}

.page-about .closing__visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  opacity: 0.9;
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .hero-tiles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .tile--a {
    grid-column: span 2;
  }

  .page-about .steps {
    overflow: visible;
  }

  .page-about .step {
    flex: 1 1 0;
  }

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

@media (min-width: 860px) {
  .page-about .sec-head {
    grid-template-columns: 64px minmax(0, 1fr);
    align-items: start;
    column-gap: 18px;
    row-gap: 6px;
  }

  .page-about .sec-num {
    grid-row: span 2;
    padding-top: 8px;
  }

  .page-about .sec-head h2,
  .page-about .sec-sub {
    grid-column: 2;
  }

  .page-about .hero-tiles {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .tile--a {
    grid-column: 1 / 8;
  }

  .page-about .tile--b {
    grid-column: 8 / 13;
  }

  .page-about .tile--c {
    grid-column: 1 / 6;
  }

  .page-about .tile--d {
    grid-column: 6 / 13;
  }

  .page-about .tl__item--first {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    column-gap: 28px;
    align-items: start;
  }

  .page-about .tl__item--first .tl__media {
    grid-column: 2;
    grid-row: 1 / span 4;
    margin-top: 0;
    max-width: none;
  }

  .page-about .method-wrap {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.15fr);
    align-items: start;
  }

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

  .page-about .step {
    flex: none;
  }

  .page-about .roles {
    grid-template-columns: 1.4fr 1.15fr 0.95fr 0.85fr;
    align-items: start;
  }

  .page-about .role:nth-child(2) {
    transform: translateY(18px);
  }

  .page-about .role:nth-child(4) {
    transform: translateY(-12px);
  }

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

  .page-about .partner__stats {
    grid-template-columns: 1fr;
  }

  .page-about .pstat:last-child {
    transform: translateX(24px);
  }

  .page-about .legacy {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .closing {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: center;
    padding-right: clamp(26px, 4vw, 56px);
  }

  .page-about .closing__visual {
    margin-right: calc(-1 * clamp(26px, 4vw, 48px));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .lcard,
  .page-about .role,
  .page-about .pstat {
    transform: none !important;
  }
}
<<<END>>>