.page-about {
  --about-soft: #5C5347;
  --about-hair: rgba(43, 233, 224, .22);
  padding-bottom: 0;
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin-top: 26px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 34px 0 64px;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -120px 0 0;
  z-index: -1;
  background:
    radial-gradient(680px 340px at 88% 4%, rgba(123, 92, 255, .16), transparent 62%),
    radial-gradient(520px 300px at 4% 92%, rgba(43, 233, 224, .09), transparent 60%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 100%;
  z-index: -1;
  background-image:
    linear-gradient(rgba(23, 32, 51, .55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 32, 51, .55) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 78%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 78%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}

.page-about .about-hero-copy h1 {
  margin: 16px 0 0;
  font-size: clamp(34px, 8.4vw, 72px);
  line-height: 1.06;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--text);
  max-width: 15ch;
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 54ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-hero-stats {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--panel);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-stat-num {
  font-size: 24px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -.02em;
  line-height: 1.1;
}

.page-about .about-stat-label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-hero-actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.page-about .about-hero-figure .figure-media {
  position: relative;
  display: block;
}

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

.page-about .about-hero-figure .figure-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(43, 233, 224, .09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 233, 224, .09) 1px, transparent 1px);
  background-size: 30px 30px;
  pointer-events: none;
  mix-blend-mode: screen;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-index-inner {
  padding-top: 18px;
  padding-bottom: 20px;
}

.page-about .about-index-title {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--dim);
}

.page-about .about-index-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.page-about .about-index-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-index-list a .mono {
  font-size: 12px;
  color: var(--cyan);
  opacity: .75;
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--about-hair);
}

/* ---------- 阶段通用 ---------- */
.page-about .about-stage {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-rail-num {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-stage-rail .section-title {
  margin: 14px 0 0;
  font-size: clamp(26px, 5.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -.015em;
  color: var(--text);
  max-width: 16ch;
}

.page-about .about-rail-note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--dim);
  max-width: 24ch;
}

.page-about .about-head .section-title {
  margin: 14px 0 0;
  font-size: clamp(26px, 5.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -.015em;
  color: var(--text);
  max-width: 20ch;
}

.page-about .about-head .lede {
  margin: 16px 0 0;
  max-width: 56ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 竖向时间轴 ---------- */
.page-about .axis {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .axis::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(43, 233, 224, .22) 42%, rgba(23, 32, 51, .9) 100%);
}

.page-about .axis-item {
  position: relative;
  padding: 0 0 34px 32px;
}

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

.page-about .axis-tick {
  position: absolute;
  left: 0;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 233, 224, .07);
  transition: background 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .axis-item:hover .axis-tick,
.page-about .axis-item:focus-within .axis-tick {
  background: var(--cyan);
  box-shadow: 0 0 0 6px rgba(43, 233, 224, .14);
}

.page-about .axis-date {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-about .axis-title {
  margin: 10px 0 0;
  font-size: 20px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--text);
}

.page-about .axis-text {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .axis-key {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--dim);
  transition: color 200ms var(--ease);
}

.page-about .axis-item:hover .axis-key {
  color: var(--cyan);
}

/* ---------- 审核流程 ---------- */
.page-about .about-review-figure {
  margin: 32px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  overflow: hidden;
}

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

.page-about .about-steps {
  margin-top: 26px;
}

.page-about .about-step {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  transition: border-color 200ms var(--ease);
}

.page-about .about-step + .about-step {
  margin-top: 12px;
}

.page-about .about-step[open] {
  border-color: var(--about-hair);
}

.page-about .about-step-summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

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

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

.page-about .about-step[open] .about-step-summary::after {
  content: "–";
}

.page-about .about-step-summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  border-radius: var(--r-md);
}

.page-about .about-step-index {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--dim);
}

.page-about .about-step-name {
  min-width: 0;
}

.page-about .about-step-body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
}

.page-about .about-step-body p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-step-list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-step-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-step-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team-lede {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .about-bar {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-bar:hover {
  transform: translateY(-2px);
  border-color: var(--about-hair);
}

.page-about .about-bar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-bar-role {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-bar-num {
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .about-bar-track {
  margin-top: 12px;
  height: 6px;
  border-radius: 999px;
  background: var(--panel-2);
  overflow: hidden;
}

.page-about .about-bar-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-about .about-bar--review .about-bar-fill {
  width: 44%;
}

.page-about .about-bar--tech .about-bar-fill {
  width: 19%;
}

.page-about .about-bar-note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-team-tail {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 1px solid var(--amber);
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 58ch;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partner-split {
  margin-top: 34px;
  gap: 32px;
}

.page-about .about-partner-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  overflow: hidden;
}

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

.page-about .about-partner-side {
  min-width: 0;
}

.page-about .about-partner-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-fact {
  background: var(--panel);
  padding: 14px 16px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-fact-num {
  font-size: 20px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: -.01em;
}

.page-about .about-fact-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-partner-text {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-partner-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 日常查验 ---------- */
.page-about .about-check-list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-check {
  background: var(--panel);
  padding: 22px 20px;
  min-width: 0;
  transition: background 200ms var(--ease);
}

.page-about .about-check:hover {
  background: var(--panel-2);
}

.page-about .about-check-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .about-check-title {
  margin: 12px 0 0;
  font-size: 19px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-check-text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 成果（奶油纸面） ---------- */
.page-about .about-paper {
  padding: 30px 22px;
  border-radius: var(--r-md);
  position: relative;
}

.page-about .about-paper::before {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--amber), var(--cyan) 55%, transparent);
}

.page-about .about-paper-eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--about-soft);
}

.page-about .about-paper-title {
  margin: 14px 0 0;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.2;
  letter-spacing: -.015em;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-paper-lede {
  margin: 14px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-records-grid {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(26, 20, 16, .14);
  border-top: 1px solid rgba(26, 20, 16, .14);
}

.page-about .about-record {
  background: transparent;
  padding: 16px 4px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-record-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.01em;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--amber);
  align-self: flex-start;
}

.page-about .about-record-label {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* ---------- 服务标准 ---------- */
.page-about .about-std-grid {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-std {
  position: relative;
  padding: 20px 18px 20px 20px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: var(--panel);
  min-width: 0;
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-std:hover {
  transform: translateY(-2px);
  border-color: var(--about-hair);
  border-left-color: var(--amber);
}

.page-about .about-std-num {
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-std-title {
  margin: 10px 0 0;
  font-size: 17px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-std-text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-standards-tail {
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-standards-actions {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 56px 0 72px;
  background:
    radial-gradient(560px 240px at 82% 0%, rgba(123, 92, 255, .16), transparent 66%),
    linear-gradient(180deg, rgba(13, 21, 34, .9), rgba(6, 10, 18, 0));
  border-top: 1px solid var(--line);
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: center;
}

.page-about .about-cta-title {
  margin: 0;
  font-size: clamp(23px, 5vw, 32px);
  line-height: 1.24;
  letter-spacing: -.015em;
  font-weight: 800;
  color: var(--text);
  max-width: 22ch;
}

.page-about .about-cta-text {
  margin: 14px 0 0;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 52px 0 84px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: 1.08fr .92fr;
    gap: 58px;
    align-items: center;
  }

  .page-about .about-hero-copy h1 {
    font-size: clamp(48px, 6vw, 72px);
  }

  .page-about .about-stat-num {
    font-size: 28px;
  }

  .page-about .about-stage {
    padding: 84px 0;
  }

  .page-about .about-stage-grid {
    grid-template-columns: 246px minmax(0, 1fr);
    gap: 66px;
    align-items: start;
  }

  .page-about .about-stage-rail {
    position: sticky;
    top: 120px;
  }

  .page-about .about-step-summary {
    padding: 18px 22px;
  }

  .page-about .about-step-body {
    padding: 0 22px 20px;
  }

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

  .page-about .about-check-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 40px;
  }

  .page-about .about-check {
    padding: 30px 28px;
  }

  .page-about .about-paper {
    padding: 52px 56px;
  }

  .page-about .about-paper::before {
    left: 56px;
    right: 56px;
  }

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

  .page-about .about-record {
    padding: 22px 26px 22px 0;
    border-right: 1px solid rgba(26, 20, 16, .14);
  }

  .page-about .about-record:nth-child(3n) {
    border-right: 0;
  }

  .page-about .about-std-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    margin-top: 40px;
  }

  .page-about .about-cta {
    padding: 76px 0 92px;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 48px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-stage-grid {
    grid-template-columns: 268px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-bar,
  .page-about .about-std,
  .page-about .axis-tick,
  .page-about .axis-key {
    transition: none;
  }

  .page-about .about-bar:hover,
  .page-about .about-std:hover {
    transform: none;
  }
}