.page-about {
  --about-glow: rgba(255, 74, 28, 0.3);
  --about-mint-wash: rgba(38, 240, 200, 0.1);
  --about-ember-wash: rgba(255, 74, 28, 0.1);
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(20px, 3vw, 40px) clamp(38px, 6vw, 84px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -22%;
  right: -16%;
  width: min(680px, 82vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 50% 50%, var(--about-glow) 0%, transparent 66%);
  filter: blur(8px);
  pointer-events: none;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-hero .eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.2vw, 74px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 16em;
}

.page-about .about-hero h1 span {
  display: inline-block;
  color: var(--ember);
  border-bottom: 6px solid var(--ink-850);
  padding-bottom: 2px;
}

.page-about .about-lede {
  margin: 0 0 clamp(22px, 3vw, 30px);
  padding-left: 16px;
  border-left: 2px solid var(--ember);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.1vw + 12px, 18px);
  line-height: 1.78;
  color: var(--paper);
  max-width: 40em;
}

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

.page-about .about-hero-media {
  margin: 0;
  aspect-ratio: 5 / 4;
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  min-width: 0;
}

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

/* ---------- 分区通用 ---------- */
.page-about .about-section {
  padding-block: clamp(42px, 6.4vw, 92px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--last {
  border-bottom: 0;
}

.page-about .about-section .section-label {
  margin: 0 0 clamp(18px, 2.4vw, 28px);
}

.page-about .about-section-head {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .about-section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(25px, 3.4vw, 42px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.015em;
  max-width: 20em;
}

.page-about .about-section-intro {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.82;
  color: var(--muted);
  max-width: 40em;
}

@media (min-width: 880px) {
  .page-about .about-section-head {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--gap);
    align-items: end;
  }
}

/* ---------- 关键数字 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 46px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .about-metric {
  background: var(--ink-850);
  padding: clamp(18px, 2.4vw, 28px);
  min-width: 0;
}

.page-about .about-metric-num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 6vw, 62px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-metric-num span {
  margin-left: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ember);
  vertical-align: 0.9em;
}

.page-about .about-metric h3 {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-metric p:not(.about-metric-num) {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-metric::after {
  content: "";
  display: block;
  height: 6px;
  margin-top: 16px;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 10px);
}

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

/* ---------- 流程 ---------- */
.page-about .about-flow-layout {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-flow-intro h2 {
  max-width: 18em;
}

.page-about .about-flow-intro p {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: var(--step--1);
  line-height: 1.82;
  color: var(--muted);
  max-width: 34em;
}

.page-about .about-flow-media {
  margin: 0;
  aspect-ratio: 9 / 7;
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
  min-width: 0;
}

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

.page-about .about-flow-media .media-caption {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

@media (min-width: 880px) {
  .page-about .about-flow-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
    gap: var(--gap);
  }
}

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

.page-about .about-flow-step {
  position: relative;
  min-width: 0;
  padding: 18px 16px 20px;
  background: var(--ink-850);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.page-about .about-flow-step:nth-child(even) {
  background: var(--ink-900);
}

.page-about .about-flow-step:hover,
.page-about .about-flow-step:focus-visible {
  border-color: var(--ember);
  background: var(--ink-850);
  transform: translateY(-2px);
}

.page-about .about-flow-step:focus-visible {
  box-shadow: 0 0 0 2px var(--mint);
}

.page-about .about-flow-num {
  display: inline-block;
  margin-bottom: 12px;
  padding-bottom: 5px;
  border-bottom: 2px solid var(--ember);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ember);
}

.page-about .about-flow-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--step-0);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-flow-step p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

@media (min-width: 820px) {
  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .about-flow-step {
    padding: 18px 14px 20px;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team-row {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-team-card {
  min-width: 0;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--ink-850);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-visible {
  border-color: var(--ember);
}

.page-about .about-team-card:focus-visible {
  box-shadow: 0 0 0 2px var(--mint);
}

.page-about .about-team-card--edit {
  border-top: 3px solid var(--ember);
}

.page-about .about-team-card--tech {
  border-top: 3px solid var(--ember-soft);
  background: linear-gradient(160deg, var(--about-ember-wash), transparent 62%), var(--ink-850);
}

.page-about .about-team-card--design {
  border-top: 3px solid var(--mint);
  background: linear-gradient(160deg, var(--about-mint-wash), transparent 62%), var(--ink-850);
}

.page-about .about-team-role {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-team-count {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-team-count span {
  margin-left: 6px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  vertical-align: 0.9em;
}

.page-about .about-team-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-team-list li {
  padding: 9px 0 9px 14px;
  position: relative;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team-list li:last-child {
  border-bottom: 0;
}

.page-about .about-team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 5px;
  height: 2px;
  background: var(--ember);
}

.page-about .about-team-media {
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  clip-path: polygon(0 6%, 100% 0, 100% 94%, 0 100%);
  min-width: 0;
}

.page-about .about-team-media img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.7) brightness(0.78);
}

@media (min-width: 900px) {
  .page-about .about-team-row {
    flex-direction: row;
    align-items: stretch;
  }
  .page-about .about-team-card:nth-child(1) { flex: 12 1 0; }
  .page-about .about-team-card:nth-child(2) { flex: 9 1 0; }
  .page-about .about-team-card:nth-child(3) { flex: 7 1 0; }
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--ember) 0%, var(--line) 38%, var(--line) 100%);
}

.page-about .about-tl-item {
  position: relative;
  padding-bottom: 12px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 16px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--line);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.page-about .about-tl-item:has(details[open])::before {
  border-color: var(--ember);
  box-shadow: 0 0 0 4px var(--about-ember-wash);
}

.page-about .about-tl-details summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 13px 16px;
  background: var(--ink-850);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  list-style: none;
  transition: border-color 180ms ease;
}

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

.page-about .about-tl-details summary:hover {
  border-color: var(--ember-soft);
}

.page-about .about-tl-details summary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--mint);
}

.page-about .about-tl-details summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ember);
}

.page-about .about-tl-details[open] summary {
  border-color: var(--ember);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.page-about .about-tl-details[open] summary::after {
  content: "－";
}

.page-about .about-tl-stage {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mint);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
}

.page-about .about-tl-title {
  font-family: var(--font-display);
  font-size: var(--step-0);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-tl-body {
  padding: 14px 18px 16px;
  background: var(--ink-850);
  border: 1px solid var(--ember);
  border-top: 0;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.page-about .about-tl-body ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .about-tl-body li {
  font-size: 13px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-tl-body li + li {
  margin-top: 6px;
}

/* ---------- 巡检 ---------- */
.page-about .about-check-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-check-item {
  min-width: 0;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--ink-850);
  position: relative;
  overflow: hidden;
}

.page-about .about-check-item::after {
  content: "";
  position: absolute;
  right: -30px;
  bottom: -40px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--about-mint-wash), transparent 70%);
  pointer-events: none;
}

.page-about .about-check-num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--mint);
}

.page-about .about-check-num span {
  margin-left: 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
  vertical-align: 0.8em;
}

.page-about .about-check-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--step-0);
  font-weight: 700;
}

.page-about .about-check-item p:not(.about-check-num) {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .about-check-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-check-item:nth-child(2) {
    margin-top: 22px;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: clamp(24px, 3.4vw, 40px);
  border-top: 1px solid var(--line);
}

.page-about .about-eco-item {
  display: grid;
  gap: 6px 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

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

.page-about .about-eco-item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--step-0);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-eco-item p:not(.about-eco-index) {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-eco-more {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

@media (min-width: 820px) {
  .page-about .about-eco-item {
    grid-template-columns: 44px minmax(0, 200px) minmax(0, 1fr);
    align-items: baseline;
    gap: 0 20px;
    padding: 22px 0;
  }
}

/* ---------- 联系路径 ---------- */
.page-about .about-contact-panel {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
  margin-top: clamp(4px, 1vw, 10px);
  padding: clamp(22px, 3.4vw, 40px);
}

.page-about .about-contact-copy h2 {
  margin: 0 0 14px;
  max-width: 16em;
}

.page-about .about-contact-copy > p {
  margin: 0 0 22px;
  font-size: var(--step--1);
  line-height: 1.82;
  color: var(--muted);
  max-width: 36em;
}

.page-about .about-contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-contact-lines {
  display: grid;
  gap: 0;
  align-content: start;
  border-top: 1px solid var(--line);
}

.page-about .about-contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-contact-label {
  flex: 0 0 auto;
  margin: 0;
  min-width: 68px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-contact-value {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
  min-width: 0;
}

.page-about .about-contact-line .copy-btn {
  margin-left: auto;
}

.page-about .about-contact-note {
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .about-contact-panel {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }
  .page-about .about-contact-lines {
    border-top: 0;
    padding-top: 4px;
  }
}

/* ---------- 窄屏收口 ---------- */
@media (max-width: 400px) {
  .page-about .about-timeline {
    padding-left: 34px;
  }
  .page-about .about-timeline::before {
    left: 9px;
  }
  .page-about .about-tl-item::before {
    left: -29px;
    width: 13px;
    height: 13px;
  }
  .page-about .about-tl-details summary {
    padding: 12px 12px;
  }
  .page-about .about-contact-label {
    min-width: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-flow-step,
  .page-about .about-team-card,
  .page-about .about-tl-item::before,
  .page-about .about-tl-details summary {
    transition: none;
  }
  .page-about .about-flow-step:hover,
  .page-about .about-flow-step:focus-visible {
    transform: none;
  }
}