.page-about {
  --about-cut: 10px;
  --about-bar: 92%;
  display: block;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(18px, 3.5vw, 40px) var(--pad-x) clamp(56px, 9vw, 110px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(6px, 1.5vw, 16px) 0 clamp(30px, 5vw, 54px);
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(42px, 10vw, 96px);
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .about-hero__hl {
  position: relative;
  z-index: 0;
  display: inline-block;
  color: var(--red);
}

.page-about .about-hero__hl::after {
  content: "";
  position: absolute;
  left: -0.03em;
  right: -0.03em;
  bottom: 0.07em;
  height: 0.1em;
  background: var(--gold);
  transform: skewX(-8deg);
  z-index: -1;
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 0 0 clamp(24px, 3vw, 34px);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 20px;
  margin: 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--paper-2);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-size: clamp(17px, 2.4vw, 22px);
  font-weight: 700;
  color: var(--red);
  white-space: nowrap;
}

.page-about .about-fact__label {
  font-size: 13px;
  color: var(--stone);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-sec {
  padding: clamp(40px, 6vw, 76px) 0;
  border-top: 1px solid var(--paper-2);
}

.page-about .section__head {
  display: block;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .section__num {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: clamp(38px, 8vw, 58px);
  font-weight: 700;
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: var(--red);
  transition: transform var(--t);
}

.page-about .section__num::after {
  content: "";
  display: block;
  width: 100%;
  max-width: 56px;
  height: 3px;
  margin-top: 10px;
  background: var(--gold);
  transform: skewX(-8deg);
}

.page-about .section__num.is-visible {
  transform: scale(1.06);
}

.page-about .section__title {
  margin: 0 0 6px;
  font-family: var(--sans);
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .section__note {
  margin: 0;
  font-size: 13px;
  color: var(--stone);
}

/* ---------- 图片容器 ---------- */

.page-about .about-fig {
  position: relative;
  margin: 0;
  background: var(--paper-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

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

.page-about .about-fig::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--red) 0%, var(--gold) 55%, rgba(246, 239, 227, 0) 100%);
  pointer-events: none;
}

.page-about .about-fig--band {
  margin-bottom: clamp(26px, 4vw, 46px);
}

/* ---------- 01 品牌主张 ---------- */

.page-about .about-claim {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-claim__text p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

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

/* ---------- 02 时间轴 ---------- */

.page-about .about-tl {
  position: relative;
}

.page-about .about-tl__rail {
  display: none;
  width: 100%;
  height: 24px;
  margin-bottom: 8px;
}

.page-about .tl-rail-line {
  stroke: var(--gold);
  stroke-width: 2;
  stroke-dasharray: 7 7;
  fill: none;
}

.page-about .about-tl__list {
  position: relative;
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .about-tl__list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 12px;
  border-left: 2px dashed var(--gold);
  opacity: 0.75;
}

.page-about .tl-node {
  position: relative;
  min-width: 0;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  background: var(--red);
  border: 2px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .tl-node__card {
  position: relative;
  padding: 16px 18px;
  background: var(--white);
  border: 1px solid var(--paper-2);
  transition: transform var(--t), border-color var(--t);
}

.page-about .tl-node__card::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: var(--about-cut);
  height: var(--about-cut);
  background: var(--paper);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .tl-node__card:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
}

.page-about .tl-node__year {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--red);
}

.page-about .tl-node__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .tl-node__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 03 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-team__text p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-stats {
  display: grid;
  gap: 0;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stats li {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 12px 0;
  border-top: 1px solid var(--paper-2);
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-stats__num {
  font-size: 18px;
  font-weight: 700;
  color: var(--red);
  white-space: nowrap;
}

/* ---------- 04 覆盖 ---------- */

.page-about .about-reach {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-reach__text p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

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

.page-about .about-reach__viz {
  padding: clamp(20px, 3vw, 28px);
  background: var(--white);
  border: 1px solid var(--paper-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-reach__viz-title {
  margin: 0 0 18px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-about .about-region {
  display: grid;
  gap: 14px;
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  list-style: none;
}

.page-about .about-region li {
  display: grid;
  grid-template-columns: minmax(0, 108px) minmax(0, 1fr);
  gap: 14px;
  align-items: center;
}

.page-about .about-region__name {
  font-size: 13px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-region__bar {
  position: relative;
  display: block;
  height: 10px;
  background: var(--paper-2);
}

.page-about .about-region__bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--fill, 50%);
  background: linear-gradient(90deg, var(--red-deep) 0%, var(--red) 68%, var(--gold) 100%);
}

.page-about .about-region__bar--a { --fill: 92%; }
.page-about .about-region__bar--b { --fill: 74%; }
.page-about .about-region__bar--c { --fill: 46%; }

.page-about .about-reach__nums {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding-top: 18px;
  border-top: 1px dashed var(--paper-2);
}

.page-about .about-reach__nums div {
  min-width: 0;
}

.page-about .about-reach__nums dt {
  font-size: 12px;
  color: var(--stone);
  margin-bottom: 6px;
}

.page-about .about-reach__nums dd {
  margin: 0;
  font-size: clamp(15px, 2vw, 19px);
  font-weight: 700;
  color: var(--red);
}

/* ---------- 05 产品原则 ---------- */

.page-about .about-rules {
  display: grid;
  gap: 14px;
}

.page-about .rule-card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--paper-2);
  transition: border-color var(--t);
}

.page-about .rule-card:hover {
  border-color: var(--gold);
}

.page-about .rule-card::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: var(--about-cut);
  height: var(--about-cut);
  background: var(--paper);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .rule-card__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .rule-card__summary::-webkit-details-marker {
  display: none;
}

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

.page-about .rule-card[open] .rule-card__summary::after {
  content: "\2212";
}

.page-about .rule-card__mark {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .rule-card__body {
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .rule-card__body p {
  margin: 0 0 12px;
}

.page-about .rule-card__case {
  padding-top: 12px;
  border-top: 1px dashed var(--paper-2);
  font-size: 13px;
}

.page-about .rule-card__case a {
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
}

.page-about .rule-card__case a:hover {
  background: var(--gold-pale);
}

/* ---------- 06 理由清单 ---------- */

.page-about .about-why {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-why li {
  position: relative;
  padding: 14px 18px 14px 44px;
  background: var(--white);
  border-left: 3px solid var(--red);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
  transition: transform var(--t), background var(--t), border-color var(--t);
}

.page-about .about-why li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  width: 10px;
  height: 10px;
  margin-top: -5px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .about-why li:hover {
  transform: translateX(4px);
  border-left-color: var(--gold);
}

.page-about .about-why li:focus-within {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .about-why li:nth-child(4) {
  background: var(--ink);
  color: var(--white);
  border-left-color: var(--gold);
}

.page-about .about-why li:nth-child(4)::before {
  background: var(--red);
}

/* ---------- 收束条 ---------- */

.page-about .about-cta {
  position: relative;
  margin-top: clamp(34px, 5vw, 58px);
  padding: clamp(24px, 4vw, 40px);
  background: var(--ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--red) 0%, var(--gold) 100%);
}

.page-about .about-cta__lead {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

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

/* ---------- 平板与桌面 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-why {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 24px;
  }

  .page-about .about-why li:nth-child(4) {
    transform: translateX(20px);
  }
}

@media (min-width: 900px) {
  .page-about .section__head {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    grid-template-rows: auto auto;
    column-gap: 32px;
    align-items: start;
  }

  .page-about .section__num {
    grid-column: 1;
    grid-row: 1 / span 2;
    margin-bottom: 0;
  }

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

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

  .page-about .about-claim {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
    align-items: start;
  }

  .page-about .about-fig--claim {
    order: -1;
  }

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

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

  .page-about .about-tl__rail {
    display: block;
  }

  .page-about .about-tl__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
    padding-left: 0;
  }

  .page-about .about-tl__list::before {
    display: none;
  }

  .page-about .tl-node::before {
    left: 22px;
    top: -26px;
  }

  .page-about .about-rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
}
<<<END>>>