/* ============ 品牌与团队 /mission/ ============ */
.page-about {
  --about-rail: 224px;
  --about-notch: 24px;
  background: var(--bg);
  color: var(--fg);
}

.page-about .about-intro .crumbs {
  margin-bottom: clamp(22px, 3.6vw, 40px);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(44px, 8vw, 104px)) 0 clamp(38px, 6vw, 74px);
  background:
    radial-gradient(88% 74% at 94% 2%, rgba(226, 59, 24, 0.34) 0%, rgba(226, 59, 24, 0) 62%),
    linear-gradient(158deg, var(--night) 0%, var(--night-2) 46%, var(--pitch) 100%);
}

.page-about .about-intro::before {
  content: "";
  position: absolute;
  z-index: -1;
  right: -6%;
  top: -20%;
  width: min(520px, 68vw);
  height: min(520px, 68vw);
  background: conic-gradient(from 210deg, rgba(240, 167, 51, 0.18), rgba(240, 167, 51, 0) 58%);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-intro::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--metal) 0%, var(--line-red) 34%, rgba(90, 27, 16, 0) 88%);
  pointer-events: none;
}

.page-about .about-intro__title {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 21ch;
  font-size: clamp(33px, 6.2vw, 80px);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--warm);
}

.page-about .about-intro__lede {
  margin: clamp(20px, 3vw, 32px) 0 0;
  max-width: 64ch;
  font-size: clamp(16px, 1.5vw, 17.5px);
  line-height: 1.85;
  color: rgba(255, 244, 236, 0.8);
}

/* 首屏数据锚点 */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(30px, 4.6vw, 56px);
  background: var(--hair-red);
  border-top: 1px solid var(--hair-red);
  border-bottom: 1px solid var(--hair-red);
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(15px, 2.2vw, 24px) clamp(14px, 2vw, 22px);
  background: rgba(7, 10, 13, 0.62);
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(27px, 4vw, 42px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ember);
}

.page-about .about-facts__num small {
  font-size: 0.44em;
  margin-left: 2px;
}

.page-about .about-facts__unit {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--slate);
}

@media (min-width: 800px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(30px, 4.6vw, 52px);
  padding: clamp(38px, 5.6vw, 78px) 0 clamp(38px, 5.6vw, 76px);
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 78px);
  }
}

/* 左侧章节目录 */
.page-about .about-rail__nav {
  border-top: 1px solid var(--hair-red);
  padding-top: 16px;
}

@media (min-width: 1080px) {
  .page-about .about-rail__sticky {
    position: sticky;
    top: calc(var(--header-h) + 30px);
  }
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 1080px) {
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    margin-top: 14px;
  }
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.24s var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  flex: none;
  width: 16px;
  height: 1px;
  background: var(--line-red);
  transition: width 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--flame-300);
}

.page-about .about-rail__link[aria-current="location"] {
  color: var(--ember);
}

.page-about .about-rail__link[aria-current="location"]::before {
  width: 30px;
  background: var(--ember);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-about .about-sec + .about-sec {
  position: relative;
  margin-top: clamp(46px, 6.4vw, 92px);
  padding-top: clamp(38px, 5.4vw, 72px);
}

.page-about .about-sec + .about-sec::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--metal) 0%, var(--line-red) 28%, rgba(90, 27, 16, 0) 100%);
}

.page-about .about-title {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: clamp(24px, 3.4vw, 42px);
  font-weight: 400;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--warm);
}

.page-about .about-lead {
  margin: clamp(13px, 1.8vw, 18px) 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-p {
  margin: clamp(14px, 2vw, 18px) 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(255, 244, 236, 0.84);
}

.page-about .about-link {
  color: var(--flame-300);
  text-decoration: underline;
  text-decoration-color: rgba(255, 122, 69, 0.42);
  text-underline-offset: 3px;
  transition: color 0.2s var(--ease), text-decoration-color 0.2s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--ember);
  text-decoration-color: var(--ember);
}

/* ---------- 使用场景 ---------- */
.page-about .audience {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(26px, 4vw, 44px);
}

@media (min-width: 880px) {
  .page-about .audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(22px, 3vw, 40px);
  }
}

.page-about .audience__item {
  position: relative;
  padding-top: 18px;
}

.page-about .audience__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--flame-500);
  transform: skewX(-30deg);
}

.page-about .audience__title {
  margin: 0;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 500;
  line-height: 1.45;
  color: var(--warm);
}

.page-about .audience__text {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  position: relative;
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  overflow: hidden;
  border: 1px solid var(--hair-red);
  background: var(--pitch);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-notch)), calc(100% - var(--about-notch)) 100%, 0 100%);
}

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

.page-about .about-figure--timeline {
  clip-path: polygon(var(--about-notch) 0, 100% 0, 100% 100%, 0 100%, 0 var(--about-notch));
}

/* ---------- 团队 ---------- */
.page-about .teams {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(26px, 4vw, 42px);
}

@media (min-width: 880px) {
  .page-about .teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .team {
  padding: clamp(20px, 2.6vw, 30px);
  background: linear-gradient(162deg, rgba(14, 59, 49, 0.9) 0%, rgba(11, 21, 34, 0.96) 74%);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .team__unit {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ember);
}

.page-about .team__num {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.6vw, 48px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--warm);
}

.page-about .team__title {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--flame-300);
}

.page-about .team__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--slate);
}

/* ---------- 四步流程 ---------- */
.page-about .flow {
  display: grid;
  gap: clamp(12px, 1.6vw, 18px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .flow__item {
  border: 1px solid var(--hair-red);
  background: rgba(14, 26, 42, 0.7);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .flow__head {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 20px);
  padding: clamp(16px, 2vw, 22px) clamp(18px, 2.4vw, 28px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .flow__head:focus-visible {
  outline: 2px solid var(--ember);
  outline-offset: -3px;
}

.page-about .flow__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--ember);
}

.page-about .flow__name {
  flex: 1 1 auto;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .flow__mark {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
}

.page-about .flow__mark::before,
.page-about .flow__mark::after {
  content: "";
  position: absolute;
  background: var(--flame-300);
}

.page-about .flow__mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-about .flow__mark::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
  transform-origin: center;
  transition: transform 0.24s var(--ease);
}

.page-about .flow__item[open] .flow__mark::after {
  transform: scaleY(0);
}

.page-about .flow__body {
  padding: 0 clamp(18px, 2.4vw, 28px) clamp(18px, 2.2vw, 26px);
}

.page-about .flow__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--slate);
}

@media (min-width: 1024px) {
  .page-about .flow {
    gap: clamp(16px, 2vw, 26px);
  }

  .page-about .flow__item:nth-child(1) {
    margin-inline-end: 20%;
  }

  .page-about .flow__item:nth-child(2) {
    margin-inline-start: 11%;
    margin-inline-end: 9%;
  }

  .page-about .flow__item:nth-child(3) {
    margin-inline-start: 21%;
    margin-inline-end: 5%;
  }

  .page-about .flow__item:nth-child(4) {
    margin-inline-start: 31%;
  }
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline__node {
  position: relative;
  padding: 0 0 clamp(26px, 3.6vw, 42px) 30px;
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 0;
  width: 1px;
  background: var(--hair-red);
}

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

.page-about .timeline__node:last-child::before {
  display: none;
}

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 5px;
  width: 9px;
  height: 9px;
  background: var(--line-red);
  transform: rotate(45deg);
}

.page-about .timeline__node:first-child .timeline__dot,
.page-about .timeline__node:last-child .timeline__dot {
  background: var(--ember);
}

.page-about .timeline__phase {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ember);
}

.page-about .timeline__title {
  margin: 8px 0 0;
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .timeline__text {
  margin: 8px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 合作生态 ---------- */
.page-about .partners {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--hair-red);
}

.page-about .partners__row {
  display: grid;
  gap: 6px 22px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-top: 1px solid var(--hair-red);
}

@media (min-width: 760px) {
  .page-about .partners__row {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: baseline;
  }
}

.page-about .partners__num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.6vw, 54px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ember);
}

.page-about .partners__body {
  min-width: 0;
}

.page-about .partners__name {
  margin: 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .partners__text {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--slate);
}

/* 行业认可 */
.page-about .honors {
  display: grid;
  gap: 1px;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--hair-red);
  border: 1px solid var(--hair-red);
}

@media (min-width: 760px) {
  .page-about .honors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .honors__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: clamp(14px, 2vw, 20px) clamp(14px, 2vw, 22px);
  background: var(--ink);
}

.page-about .honors__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ember);
  flex: none;
}

.page-about .honors__text {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 运营节奏 ---------- */
.page-about .rhythm {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rhythm__item {
  display: grid;
  gap: 6px 24px;
  padding: clamp(14px, 2vw, 20px) 0;
  border-top: 1px solid var(--hair-red);
}

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

@media (min-width: 720px) {
  .page-about .rhythm__item {
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: baseline;
  }
}

.page-about .rhythm__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--flame-300);
}

.page-about .rhythm__text {
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(255, 244, 236, 0.82);
}

/* ---------- 运营中心 ---------- */
.page-about .hub {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
  margin-top: clamp(26px, 4vw, 42px);
}

@media (min-width: 900px) {
  .page-about .hub {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .hub__text .about-p:first-child {
  margin-top: 0;
}

.page-about .hub__aside {
  padding: clamp(18px, 2.4vw, 26px);
  background: linear-gradient(150deg, rgba(14, 59, 49, 0.85) 0%, rgba(7, 10, 13, 0.96) 100%);
  border-left: 2px solid var(--ember);
}

.page-about .hub__addr {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--warm);
}

.page-about .hub__meta {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(60px, 9vw, 116px);
}

.page-about .about-cta__inner {
  position: relative;
  padding: clamp(26px, 4.4vw, 56px) clamp(22px, 3.6vw, 56px);
  background: linear-gradient(118deg, var(--flame-700) 0%, var(--night) 64%);
  clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 34px 100%, 0 calc(100% - 34px));
}

.page-about .about-cta__title {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: clamp(23px, 3.2vw, 38px);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--warm);
}

.page-about .about-cta__text {
  margin: clamp(12px, 1.8vw, 18px) 0 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(255, 244, 236, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.8vw, 32px);
}

.page-about .about-cta__actions .btn {
  min-width: 132px;
  justify-content: center;
}

/* ---------- 无障碍与动效收敛 ---------- */
.page-about .flow__head,
.page-about .about-rail__link,
.page-about .about-link {
  outline-offset: 3px;
}

.page-about :focus-visible {
  outline: 2px solid var(--ember);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow__mark::after,
  .page-about .about-rail__link::before,
  .page-about .about-rail__link {
    transition: none;
  }
}
<<<END>>>