.page-about {
  --about-rail-w: 190px;
  --about-rail-gap: clamp(24px, 3.5vw, 56px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(20px, 3vw, 36px) clamp(36px, 5vw, 64px);
  border-bottom: 2px solid var(--steel);
  background:
    radial-gradient(120% 140% at 82% 0%, rgba(41, 231, 210, 0.1) 0%, rgba(41, 231, 210, 0) 55%),
    radial-gradient(90% 120% at 0% 100%, rgba(255, 106, 43, 0.09) 0%, rgba(255, 106, 43, 0) 60%),
    var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(27, 58, 82, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 58, 82, 0.5) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 78%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: -30%;
  z-index: 0;
  width: 46%;
  height: 160%;
  background: linear-gradient(135deg, rgba(181, 33, 122, 0.22), rgba(75, 43, 224, 0.16));
  transform: rotate(8deg);
  pointer-events: none;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 28px);
  margin-top: clamp(18px, 3vw, 32px);
}

.page-about .about-hero__vnote {
  display: none;
}

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

.page-about .about-hero__lead h1 {
  margin: 0;
  max-width: 16em;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 68px);
  line-height: 1.04;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__intro--strong {
  color: var(--paper);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 28px);
}

.page-about .about-hero__stats {
  display: grid;
  gap: clamp(12px, 1.6vw, 16px);
  min-width: 0;
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 14px;
  border-left: 2px solid var(--steel);
}

.page-about .hero-stat--orange {
  border-left-color: var(--orange);
}

.page-about .hero-stat--cyan {
  border-left-color: var(--cyan);
}

.page-about .hero-stat--amber {
  border-left-color: var(--amber);
}

.page-about .hero-stat__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 4.4vw, 54px);
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .hero-stat--cyan .hero-stat__num {
  color: var(--cyan);
}

.page-about .hero-stat--amber .hero-stat__num {
  color: var(--amber);
}

.page-about .hero-stat__num i {
  font-style: normal;
  margin-left: 4px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.4em;
  letter-spacing: 0;
  color: var(--mist);
}

.page-about .hero-stat__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 画布与侧栏 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 40px);
  padding-block: clamp(36px, 5vw, 72px) clamp(48px, 7vw, 96px);
}

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

.page-about .about-rail {
  display: none;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

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

.page-about .about-rail__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 12px;
  border-left: 2px solid var(--steel);
  font-size: 13.5px;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background-color: rgba(41, 231, 210, 0.08);
}

.page-about .about-rail__link:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: -3px;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  min-width: 0;
  scroll-margin-top: 104px;
}

.page-about .about-section + .about-section {
  margin-top: clamp(48px, 7vw, 92px);
}

.page-about .about-section__head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-section__head h2 {
  margin: 0;
  max-width: 18em;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(25px, 4vw, 42px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-section__lead {
  margin: 0;
  max-width: 34em;
  font-size: clamp(14px, 1vw, 16px);
  line-height: 1.7;
  color: var(--mist);
}

.page-about .prose a {
  color: var(--amber);
  text-underline-offset: 3px;
}

/* ---------- 团队分工 ---------- */
.page-about .crew {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .crew-bar {
  --share: 100%;
  position: relative;
  width: 100%;
  min-width: 0;
  padding: 16px 18px 14px;
  background-color: var(--navy);
  border-left: 3px solid var(--orange);
  box-shadow: 6px 6px 0 rgba(3, 10, 17, 0.85);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .crew-bar:nth-child(2) {
  --share: 82%;
}

.page-about .crew-bar:nth-child(3) {
  --share: 36%;
}

.page-about .crew-bar:nth-child(4) {
  --share: 36%;
}

.page-about .crew-bar:hover {
  transform: translate(-2px, -2px);
  box-shadow: 9px 9px 0 rgba(3, 10, 17, 0.95);
  background-color: var(--steel);
  border-left-color: var(--amber);
}

.page-about .crew-bar__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
}

.page-about .crew-bar__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .crew-bar__name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.2;
  color: var(--paper);
}

.page-about .crew-bar__desc {
  margin: 8px 0 0;
  max-width: 40em;
  font-size: clamp(13px, 1vw, 14.5px);
  line-height: 1.7;
  color: var(--paper);
}

.page-about .crew-bar__items {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.page-about .crew-bar:hover .crew-bar__items {
  color: var(--cyan);
}

/* ---------- 图片基础 ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure__media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 2px solid var(--steel);
  background-color: var(--navy);
}

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

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 数据上线路径 ---------- */
.page-about .pipeline-figure {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .pipeline-figure .figure__label {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 5px 10px;
  background-color: rgba(7, 19, 32, 0.82);
  border-left: 2px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .pipeline-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
}

.page-about .pipe-steps {
  list-style: none;
  counter-reset: pipe;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .pipe-steps li {
  counter-increment: pipe;
  position: relative;
  padding: 16px 18px 16px 58px;
  background-color: var(--navy);
  border-top: 2px solid var(--steel);
  font-size: clamp(13.5px, 1vw, 15px);
  line-height: 1.7;
  color: var(--mist);
}

.page-about .pipe-steps li:last-child {
  border-bottom: 2px solid var(--steel);
}

.page-about .pipe-steps li::before {
  content: "0" counter(pipe);
  position: absolute;
  left: 18px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .pipe-steps strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(15px, 1.2vw, 17px);
  color: var(--paper);
}

.page-about .pipeline-notes {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
  padding-left: clamp(14px, 2vw, 20px);
  border-left: 3px solid var(--amber);
}

.page-about .pipeline-notes p {
  margin: 0;
  max-width: 38em;
  font-size: clamp(14px, 1vw, 16px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .pipeline-notes strong {
  font-family: var(--font-mono);
  font-size: 1.05em;
  letter-spacing: 0.04em;
  color: var(--amber);
}

/* ---------- 版本演进 ---------- */
.page-about .versions-banner {
  margin-bottom: clamp(24px, 3.5vw, 36px);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background-image: linear-gradient(
    180deg,
    var(--steel) 0%,
    var(--steel) 45%,
    var(--cyan) 64%,
    var(--violet) 88%,
    var(--magenta) 100%
  );
}

.page-about .timeline__node {
  position: relative;
  padding-left: 44px;
  padding-bottom: clamp(24px, 3.5vw, 40px);
}

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

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 4px;
  box-sizing: border-box;
  width: 23px;
  height: 23px;
  border-radius: 50%;
  background-color: var(--ink);
  border: 3px solid var(--cyan);
}

.page-about .timeline__node:last-child .timeline__dot {
  border-color: transparent;
  background-image: linear-gradient(135deg, var(--magenta), var(--violet));
}

.page-about .timeline__ver {
  display: inline-block;
  margin: 0 0 8px;
  padding: 3px 9px;
  border: 1px solid var(--steel);
  background-color: rgba(41, 231, 210, 0.06);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .timeline__node h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .timeline__desc {
  margin: 0;
  max-width: 40em;
  font-size: clamp(14px, 1vw, 15.5px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .timeline__more {
  margin-top: 12px;
  border: 1px solid var(--steel);
  background-color: var(--navy);
}

.page-about .timeline__more summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--amber);
  cursor: pointer;
  list-style: none;
}

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

.page-about .timeline__more summary::after {
  content: "+";
  font-size: 16px;
  line-height: 1;
  color: var(--amber);
}

.page-about .timeline__more[open] summary::after {
  content: "−";
}

.page-about .timeline__more summary:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: -3px;
}

.page-about .timeline__more ul {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 4px 16px 14px 30px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 覆盖规模 ---------- */
.page-about .scale-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: clamp(20px, 3vw, 34px) clamp(18px, 2.5vw, 28px);
}

.page-about .scale-item {
  min-width: 0;
  padding-top: 12px;
  border-top: 2px solid var(--steel);
}

.page-about .scale-figure {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  margin: 0;
}

.page-about .scale-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 4.6vw, 58px);
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .scale-item:nth-child(3n + 2) .scale-num {
  color: var(--cyan);
}

.page-about .scale-item:nth-child(3n) .scale-num {
  color: var(--amber);
}

.page-about .scale-unit {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 13px;
  color: var(--mist);
}

.page-about .scale-desc {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .scale-desc a {
  color: var(--amber);
  text-underline-offset: 3px;
}

/* ---------- 工作节奏 ---------- */
.page-about .rhythm-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.5vw, 24px);
}

.page-about .rhythm-card {
  min-width: 0;
  padding: clamp(18px, 2.4vw, 26px);
  background-color: var(--navy);
  border-top: 3px solid var(--steel);
}

.page-about .rhythm-card--live {
  border-top-color: var(--cyan);
}

.page-about .rhythm-card--desk {
  border-top-color: var(--amber);
}

.page-about .rhythm-card .rhythm-card__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .rhythm-card--desk .rhythm-card__tag {
  color: var(--amber);
}

.page-about .rhythm-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .rhythm-card .rhythm-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .rhythm-note {
  margin-top: clamp(18px, 2.5vw, 26px);
  padding: clamp(18px, 2.4vw, 26px);
  background-color: rgba(14, 34, 51, 0.7);
  border: 2px solid var(--steel);
  border-left: 4px solid var(--orange);
}

.page-about .rhythm-note h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .rhythm-note p {
  margin: 0;
  max-width: 42em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .rhythm-note strong {
  font-family: var(--font-mono);
  font-size: 0.96em;
  letter-spacing: 0.02em;
  color: var(--amber);
}

/* ---------- 收尾 ---------- */
.page-about .about-outro {
  display: grid;
  gap: 18px;
  margin-top: clamp(40px, 6vw, 72px);
  padding: clamp(22px, 3vw, 34px);
  background-image: linear-gradient(135deg, rgba(181, 33, 122, 0.28), rgba(75, 43, 224, 0.28));
  background-color: var(--navy);
  border: 2px solid var(--steel);
}

.page-about .about-outro__text {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(18px, 2.4vw, 26px);
  line-height: 1.4;
  color: var(--paper);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 780px) {
  .page-about .rhythm-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .pipeline-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 44px minmax(0, 1fr) minmax(0, 300px);
    column-gap: clamp(24px, 3vw, 40px);
    align-items: start;
  }

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

  .page-about .crew-bar {
    width: var(--share);
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: var(--about-rail-gap);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 90px;
    align-self: start;
  }
}
<<<END>>>