/* ===== page-about : 品牌与使命 ===== */
.page-about {
  --about-rail: clamp(26px, 4.6vw, 52px);
  --about-gap: clamp(22px, 3vw, 44px);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(36px, 5.5vw, 78px) 0 clamp(54px, 8vw, 118px);
  background:
    radial-gradient(112% 82% at 86% 4%, rgba(31, 111, 235, 0.22), rgba(31, 111, 235, 0) 62%),
    radial-gradient(84% 62% at 4% 98%, rgba(255, 106, 31, 0.13), rgba(255, 106, 31, 0) 64%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 4vw, 54px);
  align-items: end;
}

.page-about .about-hero__text {
  border-left: 1px solid var(--line-green);
  padding-left: var(--about-rail);
}

.page-about .about-hero__text .display {
  margin: 14px 0 0;
  max-width: 16em;
}

.page-about .about-hero__text .lede {
  margin: clamp(18px, 2.4vw, 30px) 0 0;
  max-width: 40em;
}

.page-about .about-hero__card {
  padding: clamp(22px, 2.6vw, 32px);
  border-radius: var(--r);
}

.page-about .about-hero__cardtitle {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--blue-mist);
  text-transform: uppercase;
}

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

.page-about .about-hero__facts li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-hero__facts li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-hero__key {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-dim);
}

.page-about .about-hero__val {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--snow);
  white-space: nowrap;
}

.page-about .about-hero__val--signal {
  color: var(--orange);
  font-weight: 700;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-block: clamp(50px, 7.5vw, 110px);
}

.page-about .about-chapter + .about-chapter {
  border-top: 1px solid rgba(156, 195, 238, 0.1);
}

.page-about .about-chapter__inner {
  display: grid;
  gap: 16px;
}

.page-about .about-index {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 18px;
}

.page-about .about-index::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  bottom: 3px;
  width: 1px;
  background: var(--line-green);
  transition: background 0.5s var(--ease), box-shadow 0.5s var(--ease);
}

.page-about .about-chapter.is-current .about-index::before {
  background: linear-gradient(180deg, var(--blue), var(--orange));
  box-shadow: 0 0 10px rgba(31, 111, 235, 0.45);
}

.page-about .index-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--blue-mist);
  transition: color 0.4s var(--ease);
}

.page-about .about-chapter.is-current .index-num {
  color: var(--orange);
}

.page-about .about-index__label {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  line-height: 1.5;
}

.page-about .about-h2 {
  margin: 0;
  font-size: clamp(28px, 4.6vw, 66px);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--snow);
  max-width: 20em;
}

.page-about .about-sub {
  margin: 14px 0 clamp(22px, 3vw, 38px);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  line-height: 1.7;
  color: var(--ink-dim);
}

.page-about .about-chapter__body .prose {
  max-width: 38em;
}

.page-about .about-chapter__body .prose a,
.page-about .about-lines__foot a,
.page-about .about-team__foot a,
.page-about .about-close__inner a {
  color: var(--blue-mist);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 01 品牌起点 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
  margin-top: clamp(8px, 1.4vw, 18px);
}

.page-about .about-split__text .prose,
.page-about .about-split__text p {
  max-width: 34em;
}

.page-about .about-split__text p + p {
  margin-top: 1.35em;
}

.page-about .about-split__media {
  margin: 0;
}

.page-about .about-audience {
  margin-top: clamp(34px, 4.6vw, 62px);
}

.page-about .about-audience__lead {
  margin: 0 0 20px;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
}

.page-about .about-audience__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-audience__item {
  display: grid;
  gap: 8px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--green-500);
  border-radius: var(--r);
  background: linear-gradient(90deg, rgba(20, 82, 63, 0.42), rgba(11, 46, 36, 0.12));
}

.page-about .about-audience__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-audience__text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-dim);
}

/* ---------- 02 内容与数据 ---------- */
.page-about .about-figure-band {
  margin: clamp(28px, 4.2vw, 56px) 0 clamp(30px, 4.4vw, 58px);
}

.page-about .about-figure-band__note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
}

.page-about .about-lines {
  list-style: none;
  margin: clamp(6px, 1vw, 14px) 0 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .about-line {
  display: grid;
  gap: 12px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-line:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-line__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--blue);
}

.page-about .about-line__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.5vw, 21px);
  font-weight: 500;
  color: var(--snow);
}

.page-about .about-line__text {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .about-line .tag {
  justify-self: start;
  white-space: nowrap;
}

.page-about .about-lines__foot {
  margin: clamp(22px, 3vw, 34px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-mute);
}

/* ---------- 03 发展阶段 ---------- */
.page-about .about-chart {
  margin: clamp(24px, 3.4vw, 46px) 0 clamp(28px, 4vw, 52px);
}

.page-about .about-chart svg {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

.page-about .about-chart__axis {
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .about-chart__grid {
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 3 7;
}

.page-about .about-chart__line {
  fill: none;
  stroke: var(--blue);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .about-chart__dot {
  fill: var(--green-900);
  stroke: var(--blue);
  stroke-width: 2;
}

.page-about .about-chart__dot--now {
  fill: var(--orange);
  stroke: var(--orange);
}

.page-about .about-chart__label {
  font-family: var(--font-mono);
  font-size: 15px;
  fill: var(--ink-dim);
}

.page-about .about-chart__legend {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
}

.page-about .about-chart__swatch {
  width: 10px;
  height: 10px;
  display: inline-block;
  border-radius: 50%;
  background: var(--blue);
}

.page-about .about-chart__swatch--now {
  background: var(--orange);
}

.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-stage__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  cursor: pointer;
  list-style: none;
  transition: color 0.3s var(--ease);
}

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

.page-about .about-stage__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--blue);
}

.page-about .about-stage__d[open] > .about-stage__sum::after {
  content: "–";
  color: var(--orange);
}

.page-about .about-stage__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--blue-mist);
}

.page-about .about-stage__name {
  font-size: clamp(16px, 1.5vw, 19px);
  color: var(--snow);
}

.page-about .about-stage__meta {
  font-size: 13px;
  color: var(--ink-mute);
}

.page-about .about-stage__text {
  margin: 0 0 18px;
  padding-left: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-about .about-stage:last-child .about-stage__d[open] > .about-stage__sum {
  border-bottom: 0;
}

/* ---------- 04 团队 ---------- */
.page-about .about-quote {
  margin: 0 0 clamp(28px, 4vw, 48px);
  padding: clamp(22px, 3vw, 34px);
  border-radius: var(--r);
  border-left: 2px solid var(--blue);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 40em;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: var(--snow);
}

.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-team__card {
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(20, 82, 63, 0.5), rgba(11, 46, 36, 0.2));
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-team__card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
}

.page-about .about-team__n {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--blue-mist);
}

.page-about .about-team__card:hover .about-team__n {
  color: var(--orange);
}

.page-about .about-team__name {
  margin: 16px 0 10px;
  font-size: 17px;
  font-weight: 500;
  color: var(--snow);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .about-team__keys {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  transition: color 0.3s var(--ease);
}

.page-about .about-team__card:hover .about-team__keys {
  color: var(--blue-mist);
}

.page-about .about-team__foot {
  margin: clamp(24px, 3.2vw, 40px) 0 0;
  max-width: 42em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-mute);
}

/* ---------- 05 为什么选择 ---------- */
.page-about .about-reasons {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
  counter-reset: none;
}

.page-about .about-reason {
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

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

.page-about .about-reason__title {
  margin: 10px 0 10px;
  font-size: clamp(18px, 1.8vw, 24px);
  font-weight: 400;
  color: var(--snow);
}

.page-about .about-reason__text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.page-about .about-snowline {
  margin: clamp(36px, 5vw, 66px) 0 0;
}

.page-about .about-snowline__cap {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-mute);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding-block: clamp(54px, 7.5vw, 108px);
  border-top: 1px solid var(--line);
  background: radial-gradient(92% 74% at 18% 0%, rgba(31, 111, 235, 0.16), rgba(31, 111, 235, 0) 62%);
}

.page-about .about-close__inner .about-h2 {
  max-width: 18em;
  margin-top: 14px;
}

.page-about .about-close__inner .prose {
  margin: clamp(16px, 2.2vw, 26px) 0 0;
  max-width: 40em;
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(24px, 3.2vw, 38px);
}

/* ---------- 栅格与断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-audience__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-audience__item {
    grid-template-rows: auto 1fr;
  }

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

  .page-about .about-line {
    grid-template-columns: 56px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-line .tag {
    grid-column: 2 / 3;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-chapter__inner {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: clamp(16px, 2vw, 30px);
    row-gap: 0;
  }

  .page-about .about-index {
    grid-column: 1 / 3;
    padding-top: 10px;
  }

  .page-about .about-chapter__body {
    grid-column: 4 / 13;
  }

  .page-about .about-figure-band {
    grid-column: 2 / 13;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-line {
    grid-template-columns: 56px minmax(0, 1fr) auto;
    align-items: center;
    padding: 26px 0;
  }

  .page-about .about-line .tag {
    grid-column: auto;
  }

  .page-about .about-reasons {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 2.6vw, 34px);
  }

  .page-about .about-close__inner {
    padding-left: var(--about-rail);
    border-left: 1px solid var(--line-green);
  }
}

@media (min-width: 1200px) {
  .page-about .about-chapter__body {
    grid-column: 4 / 12;
  }

  .page-about .about-figure-band {
    grid-column: 2 / 12;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-index::before,
  .page-about .about-team__n,
  .page-about .about-team__keys {
    transition: none;
  }

  .page-about .about-team__card:hover {
    transform: none;
  }
}
<<<END>>>