.page-about {
  background-color: var(--deep-space);
  color: var(--text-light);
  font-family: var(--font-body);
  line-height: 1.6;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  padding: 24px 0 72px;
  background: linear-gradient(135deg, var(--deep-space) 0%, #102A54 62%, #0D423B 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 48px;
  background: linear-gradient(135deg, transparent 50%, var(--deep-teal) 50%);
  opacity: 0.85;
}

.page-about .about-hero__shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 32px;
  font-size: 13px;
  color: var(--text-mist);
}

.page-about .about-hero .breadcrumb a {
  color: var(--text-mist);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--electric-green);
}

.page-about .about-hero .breadcrumb__sep {
  margin: 0 8px;
  color: var(--dark-gold);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-hero__eyebrow {
  margin-bottom: 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--electric-green);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 28px;
  line-height: 1.25;
  letter-spacing: 0.02em;
}

.page-about .about-hero__lead {
  margin: 0 0 32px;
  font-size: 16px;
  color: var(--text-mist);
  max-width: 480px;
}

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

.page-about .about-hero__meta-item {
  padding: 12px 16px;
  background: rgba(11, 30, 60, 0.55);
  border: 1px solid rgba(192, 200, 208, 0.25);
  border-radius: 8px;
  min-width: 110px;
}

.page-about .about-hero__meta-item .data-label {
  display: block;
  font-size: 12px;
  margin-bottom: 4px;
}

.page-about .about-hero__meta-item .data-number {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--electric-green);
}

.page-about .about-hero__visual {
  position: relative;
  max-width: 520px;
  margin: 0 auto;
  display: none;
}

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

.page-about .about-hero__corner {
  position: absolute;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 14px;
  color: var(--dark-gold);
}

.page-about .about-hero__corner--tl {
  top: 10px;
  left: 14px;
}

.page-about .about-hero__corner--br {
  bottom: 10px;
  right: 14px;
  color: var(--electric-green);
}

/* ===== 页内索引 ===== */
.page-about .about-index {
  background: var(--deep-teal);
  border-top: 1px solid rgba(0, 255, 170, 0.2);
}

.page-about .about-index__shell {
  padding-top: 16px;
  padding-bottom: 16px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.page-about .about-index__list a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--electric-green);
  border-bottom-color: var(--electric-green);
}

/* ===== Section 通用 ===== */
.page-about .section {
  padding: 48px 0;
}

.page-about .section-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--dark-gold);
  line-height: 1;
  margin-bottom: 8px;
}

.page-about .about-section-head {
  margin-bottom: 40px;
}

.page-about .about-section-head h2 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 28px;
  line-height: 1.2;
}

.page-about .about-section-head p {
  margin: 0;
  color: var(--text-mist);
  font-size: 15px;
  max-width: 560px;
}

/* ===== 我们是谁 ===== */
.page-about .about-intro {
  background-color: var(--deep-space);
}

.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-intro__label .section-index {
  display: block;
}

.page-about .about-intro__label h2 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 26px;
}

.page-about .about-intro__lead {
  font-size: 18px;
  font-weight: 400;
  color: var(--text-light);
  line-height: 1.7;
  border-left: 4px solid var(--electric-green);
  padding-left: 16px;
  margin-bottom: 20px;
}

.page-about .about-intro__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-intro__cols p {
  margin: 0;
  color: var(--text-mist);
  font-size: 15px;
}

/* ===== 时间轴 ===== */
.page-about .about-timeline {
  background: linear-gradient(180deg, var(--deep-space) 0%, var(--wine-red) 100%);
}

.page-about .about-timeline__layout {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-timeline__line {
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(to bottom, var(--electric-green), var(--dark-gold));
  opacity: 0.45;
}

.page-about .about-milestone {
  position: relative;
  padding-left: 30px;
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--electric-green);
  box-shadow: 0 0 0 4px rgba(0, 255, 170, 0.18);
  z-index: 1;
}

.page-about .about-milestone__year {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--dark-gold);
  line-height: 1;
  margin-bottom: 10px;
}

.page-about .about-milestone__card {
  background: rgba(11, 30, 60, 0.55);
  border-radius: 10px;
}

.page-about .about-milestone__card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.page-about .about-milestone__ver {
  font-size: 13px;
  color: var(--text-mist);
  letter-spacing: 0.04em;
}

.page-about .about-milestone__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  color: var(--text-light);
}

.page-about .about-milestone__card p {
  margin: 0;
  font-size: 14px;
  color: var(--text-mist);
}

.page-about .about-milestone__card .expand {
  margin-top: 14px;
}

.page-about .about-milestone__card .expand summary {
  cursor: pointer;
  color: var(--electric-green);
  font-size: 13px;
  font-weight: 700;
  list-style: none;
  padding: 4px 0;
}

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

.page-about .about-milestone__card .expand summary::before {
  content: "+";
  display: inline-block;
  margin-right: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  transition: transform var(--transition);
}

.page-about .about-milestone__card .expand[open] summary::before {
  transform: rotate(45deg);
}

.page-about .about-milestone__card .expand-body {
  padding: 12px 14px;
  background: rgba(192, 200, 208, 0.08);
  border-radius: 8px;
  margin-top: 10px;
}

.page-about .about-milestone__card .expand-body ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-milestone__card .expand-body li {
  padding: 4px 0;
  font-size: 14px;
  color: var(--text-mist);
}

.page-about .about-milestone__card .expand-body li::before {
  content: "›";
  color: var(--electric-green);
  margin-right: 8px;
}

.page-about .about-timeline__image-wrap {
  margin-top: 40px;
  text-align: center;
}

.page-about .about-timeline__image-wrap .media {
  max-width: 480px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(192, 200, 208, 0.2);
}

.page-about .about-timeline__image-wrap img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  object-position: center;
}

.page-about .about-timeline__caption {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-mist);
  letter-spacing: 0.04em;
}

/* ===== 数据覆盖版图 ===== */
.page-about .about-coverage {
  background-color: var(--deep-teal);
}

.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-coverage__map-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-content: start;
}

.page-about .about-coverage__media {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(192, 200, 208, 0.18);
}

.page-about .about-coverage__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  object-position: center;
}

.page-about .about-coverage__regions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-about .about-coverage__regions li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-light);
  padding: 8px 10px;
  background: rgba(11, 30, 60, 0.35);
  border-radius: 6px;
  transition: background var(--transition);
}

.page-about .about-coverage__regions li:hover {
  background: rgba(0, 255, 170, 0.14);
}

.page-about .region-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.page-about .region-dot--europe {
  background: var(--electric-green);
  box-shadow: 0 0 0 3px rgba(0, 255, 170, 0.2);
}

.page-about .region-dot--asia {
  background: var(--dark-gold);
  box-shadow: 0 0 0 3px rgba(176, 138, 74, 0.2);
}

.page-about .region-dot--americas {
  background: #5a9cff;
  box-shadow: 0 0 0 3px rgba(90, 156, 255, 0.2);
}

.page-about .region-dot--global {
  background: var(--china-red);
  box-shadow: 0 0 0 3px rgba(226, 61, 61, 0.2);
}

.page-about .about-coverage__side {
  align-self: start;
}

.page-about .about-coverage__panel {
  background: var(--indigo);
  border-radius: 14px;
  padding: 28px 24px;
  border: 1px solid rgba(192, 200, 208, 0.2);
  position: relative;
  overflow: hidden;
}

.page-about .about-coverage__panel::after {
  content: "DATA";
  position: absolute;
  right: -8px;
  bottom: 8px;
  font-family: var(--font-mono);
  font-size: 64px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.04);
  line-height: 1;
  letter-spacing: 0.06em;
}

.page-about .about-coverage__panel h3 {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  color: var(--text-light);
}

.page-about .about-coverage__stats {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  position: relative;
  z-index: 1;
}

.page-about .about-coverage__stat {
  padding: 16px;
  background: rgba(11, 30, 60, 0.45);
  border-radius: 10px;
  border-left: 3px solid var(--electric-green);
}

.page-about .about-coverage__stat .data-label {
  display: block;
  font-size: 12px;
  margin-bottom: 8px;
  color: var(--text-mist);
}

.page-about .about-coverage__stat .data-number {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--electric-green);
  line-height: 1.1;
}

.page-about .about-coverage__note {
  margin: 20px 0 0;
  font-size: 13px;
  color: var(--text-mist);
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

/* ===== 团队与运营 ===== */
.page-about .about-team {
  background-color: var(--deep-space);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-team__media-wrap {
  order: 1;
}

.page-about .about-team__media {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(192, 200, 208, 0.18);
  max-width: 420px;
}

.page-about .about-team__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  object-position: center;
}

.page-about .about-team__content {
  order: 2;
}

.page-about .about-team__points {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-team__points li {
  padding: 16px 18px;
  background: rgba(11, 30, 60, 0.5);
  border-radius: 10px;
  border-left: 3px solid var(--dark-gold);
  font-size: 15px;
  color: var(--text-mist);
  transition: background var(--transition), border-color var(--transition);
}

.page-about .about-team__points li:hover {
  background: rgba(11, 30, 60, 0.8);
  border-color: var(--electric-green);
}

.page-about .about-team__points strong {
  font-family: var(--font-mono);
  color: var(--electric-green);
  font-weight: 700;
}

.page-about .about-team__note {
  font-size: 14px;
  color: var(--text-mist);
  padding: 14px 18px;
  background: rgba(58, 36, 102, 0.4);
  border-radius: 10px;
  border: 1px solid rgba(192, 200, 208, 0.15);
}

/* ===== 用户与价值 ===== */
.page-about .about-value {
  background: linear-gradient(160deg, var(--deep-space) 0%, var(--wine-red) 78%, var(--wine-red) 100%);
}

.page-about .about-value__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-value__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.page-about .about-value__stat {
  padding: 24px 18px;
  background: rgba(11, 30, 60, 0.5);
  border-radius: 12px;
  border-top: 3px solid var(--electric-green);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-value__stat .data-number {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--electric-green);
  line-height: 1.1;
}

.page-about .about-value__stat .data-label {
  font-size: 13px;
  color: var(--text-mist);
}

.page-about .about-value__badge {
  grid-column: 1 / -1;
  text-align: center;
  padding-top: 4px;
}

.page-about .about-value__text h3 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
}

.page-about .about-value__text ul {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-value__text li {
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-mist);
  padding-left: 38px;
  position: relative;
}

.page-about .about-value__text li::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 18px;
  width: 8px;
  height: 8px;
  background: var(--electric-green);
  border-radius: 50%;
}

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

.page-about .about-value__links .button {
  text-decoration: none;
  padding: 12px 22px;
  border-radius: 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
}

.page-about .about-value__links .button--primary {
  background: var(--electric-green);
  color: var(--deep-space);
  border: 2px solid var(--electric-green);
}

.page-about .about-value__links .button--primary:hover,
.page-about .about-value__links .button--primary:focus-visible {
  background: transparent;
  color: var(--electric-green);
}

.page-about .about-value__links .button--ghost {
  background: transparent;
  border: 2px solid var(--metal-silver);
  color: var(--text-light);
}

.page-about .about-value__links .button--ghost:hover,
.page-about .about-value__links .button--ghost:focus-visible {
  border-color: var(--electric-green);
  color: var(--electric-green);
}

.page-about .about-value__links .button:hover {
  transform: translateY(-2px);
}

/* ===== 桌面端断点 ===== */
@media (min-width: 640px) {
  .page-about .about-hero h1 {
    font-size: 34px;
  }

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

  .page-about .about-hero__meta {
    gap: 16px;
  }

  .page-about .about-intro__cols {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .page-about .about-timeline__layout {
    gap: 32px;
  }

  .page-about .about-coverage__regions {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-team__points {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .page-about .about-value__text ul {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .section {
    padding: 80px 0;
  }

  .page-about .about-hero {
    padding: 40px 0 100px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

  .page-about .about-hero h1 {
    font-size: 40px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-intro__grid {
    grid-template-columns: 240px 1fr;
    gap: 48px;
  }

  .page-about .about-intro__label {
    position: sticky;
    top: 120px;
    align-self: start;
  }

  .page-about .about-intro__label .section-index {
    font-size: 44px;
  }

  .page-about .about-intro__label h2 {
    font-size: 30px;
  }

  .page-about .about-section-head {
    display: grid;
    grid-template-columns: 240px 1fr;
    align-items: end;
    gap: 32px;
  }

  .page-about .about-section-head .section-index {
    grid-row: 1 / span 2;
  }

  .page-about .about-section-head h2 {
    grid-column: 2;
    font-size: 34px;
  }

  .page-about .about-section-head p {
    grid-column: 2;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: 1fr 1fr;
    column-gap: 48px;
    row-gap: 40px;
  }

  .page-about .about-timeline__line {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-milestone {
    padding-left: 0;
  }

  .page-about .about-milestone--left {
    grid-column: 1;
    text-align: right;
    padding-right: 44px;
  }

  .page-about .about-milestone--right {
    grid-column: 2;
    padding-left: 44px;
    margin-top: 80px;
  }

  .page-about .about-milestone::before {
    left: auto;
  }

  .page-about .about-milestone--left::before {
    left: auto;
    right: -5px;
  }

  .page-about .about-milestone--right::before {
    left: -5px;
  }

  .page-about .about-milestone--left .about-milestone__card-head {
    justify-content: flex-end;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: 1fr 360px;
    gap: 40px;
    align-items: start;
  }

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

  .page-about .about-coverage__panel {
    padding: 36px 28px;
  }

  .page-about .about-coverage__stats {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 420px 1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-team__media-wrap {
    order: initial;
  }

  .page-about .about-team__content {
    order: initial;
  }

  .page-about .about-value__grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-value__stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-value__badge {
    grid-column: 1;
    text-align: left;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero h1 {
    font-size: 46px;
  }

  .page-about .about-hero__meta-item {
    min-width: 130px;
    padding: 14px 20px;
  }

  .page-about .about-timeline__layout {
    column-gap: 64px;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: 1fr 400px;
  }

  .page-about .about-value__stat .data-number {
    font-size: 38px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}