.page-about.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 20px 88px;
  background: var(--bg-cream);
  font-family: var(--font-body);
  color: var(--ink-black);
  overflow-x: clip;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 32px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

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

.page-about .breadcrumb a:hover {
  color: var(--red-fire);
  text-decoration: underline;
}

.page-about .breadcrumb-current {
  color: var(--ink-black);
}

.page-about .section-kicker {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--red-fire);
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--ink-black);
  color: var(--white);
  padding: 44px 24px 40px;
  margin-bottom: 36px;
  box-shadow: var(--shadow-card);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 100%;
  height: 40%;
  background: linear-gradient(135deg, var(--red-fire), var(--orange-hot));
  clip-path: polygon(66% 0, 100% 0, 100% 100%, 0 100%);
  z-index: 1;
}

.page-about .about-hero-bg-number {
  position: absolute;
  top: 6px;
  left: 6%;
  font-family: var(--font-heavy);
  font-size: 112px;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.14);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-content {
  position: relative;
  z-index: 2;
}

.page-about .about-hero-content .section-kicker {
  color: var(--orange-hot);
}

.page-about .about-hero-title {
  margin: 0 0 16px;
  font-family: var(--font-heavy);
  font-size: 34px;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-about .about-hero-title span {
  color: var(--orange-hot);
}

.page-about .about-hero-lead {
  max-width: 46ch;
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.78);
}

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

.page-about .about-hero .btn--ghost {
  border-color: rgba(255, 255, 255, 0.55);
  color: var(--white);
}

.page-about .about-hero-deco {
  position: relative;
  z-index: 2;
  margin-top: 36px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 16px;
}

.page-about .about-hero-stat {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  background: var(--white);
  color: var(--ink-black);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.page-about .about-hero-stat strong {
  font-family: var(--font-heavy);
  font-size: 28px;
  line-height: 1;
  color: var(--red-fire);
}

.page-about .about-hero-stat strong small {
  font-size: 0.6em;
  color: var(--orange-hot);
}

.page-about .about-hero-stat span {
  margin-top: 4px;
  font-size: 12px;
  color: var(--ink-soft);
}

.page-about .about-hero-vertical {
  writing-mode: vertical-rl;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.82);
}

/* ===== 本页目录 ===== */
.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 48px;
}

.page-about .about-index a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  background: var(--white);
  border: 1px solid var(--line-rule);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-index a:hover {
  color: var(--red-fire);
  border-color: var(--red-fire);
  background: var(--bg-cream);
}

/* ===== 缘起 ===== */
.page-about .about-origin {
  display: grid;
  gap: 24px;
  margin-bottom: 72px;
}

.page-about .about-origin-inner {
  position: relative;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  border-left: 6px solid var(--blue-storm);
  box-shadow: 0 6px 16px rgba(22, 22, 22, 0.04);
}

.page-about .about-origin-inner::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 72px;
  height: 72px;
  background: radial-gradient(circle at 100% 100%, var(--orange-hot) 0 34px, transparent 34px);
  opacity: 0.1;
  pointer-events: none;
}

.page-about .about-origin-inner h2 {
  margin: 0 0 16px;
  font-family: var(--font-heavy);
  font-size: 28px;
  line-height: 1.15;
}

.page-about .about-origin-inner p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-origin-principle {
  margin: 24px 0 0;
  padding: 16px 20px;
  background: var(--bg-cream);
  border-left: 4px solid var(--red-fire);
  border-radius: var(--radius-md);
  font-family: var(--font-heavy);
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-black);
}

.page-about .about-origin-side {
  display: flex;
  justify-content: flex-end;
  align-items: flex-end;
  gap: 12px;
}

.page-about .about-origin-speedlabel {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.page-about .about-origin-deco {
  font-family: var(--font-heavy);
  font-size: 64px;
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 1px rgba(22, 22, 22, 0.12);
  user-select: none;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  position: relative;
  margin-bottom: 72px;
}

.page-about .about-milestones::before {
  content: "5000";
  position: absolute;
  top: -8px;
  right: 0;
  font-family: var(--font-heavy);
  font-size: 96px;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(22, 22, 22, 0.06);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-milestones-head {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 32px;
}

.page-about .about-milestones-head h2 {
  margin: 0;
  font-family: var(--font-heavy);
  font-size: 30px;
  line-height: 1.1;
}

.page-about .about-milestones-head p {
  max-width: 40ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-soft);
}

.page-about .about-timeline {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 24px;
  margin-bottom: 32px;
}

.page-about .about-timeline-item {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 84px 24px 1fr;
  gap: 16px;
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 112px;
  top: 28px;
  bottom: -26px;
  width: 2px;
  background: var(--line-rule);
}

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

.page-about .about-timeline-meta {
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  padding-top: 8px;
  font-family: var(--font-heavy);
  font-size: 17px;
  line-height: 1.2;
  color: var(--red-fire);
}

.page-about .about-timeline-dot {
  position: relative;
  width: 16px;
  height: 16px;
  margin-top: 18px;
  border-radius: 50%;
  background: var(--red-fire);
  border: 3px solid var(--bg-cream);
  box-shadow: 0 0 0 2px var(--red-fire);
  justify-self: center;
  align-self: start;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-timeline-2018 .about-timeline-dot {
  background: var(--orange-hot);
  box-shadow: 0 0 0 2px var(--orange-hot);
}

.page-about .about-timeline-2018 .about-timeline-meta {
  color: var(--orange-hot);
}

.page-about .about-timeline-2020 .about-timeline-dot {
  background: var(--blue-storm);
  box-shadow: 0 0 0 2px var(--blue-storm);
}

.page-about .about-timeline-2020 .about-timeline-meta {
  color: var(--blue-storm);
}

.page-about .about-timeline-2022 .about-timeline-dot {
  background: var(--orange-hot);
  box-shadow: 0 0 0 2px var(--orange-hot);
}

.page-about .about-timeline-2022 .about-timeline-meta {
  color: var(--orange-hot);
}

.page-about .about-timeline-now .about-timeline-dot {
  background: var(--red-fire);
  box-shadow: 0 0 0 2px var(--red-fire), 0 0 0 7px rgba(224, 47, 30, 0.16);
}

.page-about .about-timeline-now .about-timeline-meta {
  color: var(--red-fire);
}

.page-about .about-timeline-item:hover .about-timeline-dot {
  transform: scale(1.18);
}

.page-about .about-timeline-body {
  background: var(--white);
  border: 1px solid var(--line-rule);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .about-timeline-item:hover .about-timeline-body {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  border-color: var(--orange-hot);
}

.page-about .about-timeline-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-heavy);
  font-size: 17px;
  line-height: 1.2;
}

.page-about .about-timeline-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .about-milestones-figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.page-about .about-milestones-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, 0.14) 46%, transparent 60%);
  pointer-events: none;
}

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

/* ===== 为什么改版 ===== */
.page-about .about-redesign {
  position: relative;
  background: var(--bg-tint);
  border-radius: var(--radius-lg);
  padding: 40px 24px 36px;
  margin-bottom: 72px;
}

.page-about .about-redesign::before {
  content: "";
  position: absolute;
  top: 0;
  left: 24px;
  width: 72px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--red-fire);
}

.page-about .about-redesign h2 {
  margin: 0 0 8px;
  font-family: var(--font-heavy);
  font-size: 28px;
  line-height: 1.12;
}

.page-about .about-redesign-lead {
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .about-redesign-grid {
  display: grid;
  gap: 16px;
  margin-bottom: 20px;
}

.page-about .about-redesign-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-redesign-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.page-about .about-redesign-num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-heavy);
  font-size: 24px;
  line-height: 1;
  color: var(--blue-storm);
  transition: color 0.2s ease;
}

.page-about .about-redesign-card:hover .about-redesign-num {
  color: var(--red-fire);
}

.page-about .about-redesign-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heavy);
  font-size: 16px;
  line-height: 1.2;
}

.page-about .about-redesign-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .about-redesign-details {
  background: var(--white);
  border: 1px solid var(--line-rule);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.page-about .about-redesign-details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heavy);
  font-size: 15px;
  color: var(--ink-black);
}

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

.page-about .about-redesign-details summary::after {
  content: "+";
  font-size: 22px;
  line-height: 1;
  color: var(--red-fire);
  transition: transform 0.2s ease;
}

.page-about .about-redesign-details[open] summary::after {
  transform: rotate(45deg);
}

.page-about .about-redesign-details[open] summary {
  color: var(--red-fire);
}

.page-about .about-redesign-details p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* ===== 数据服务理念 ===== */
.page-about .about-data {
  display: grid;
  gap: 28px;
  margin-bottom: 72px;
}

.page-about .about-data-media {
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

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

.page-about .about-data-copy h2 {
  margin: 0 0 12px;
  font-family: var(--font-heavy);
  font-size: 28px;
  line-height: 1.12;
}

.page-about .about-data-copy p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-data-list {
  list-style: none;
  padding: 0;
  margin: 24px 0;
  border-top: 2px solid var(--line-rule);
}

.page-about .about-data-list li {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-rule);
  font-size: 16px;
  font-weight: 600;
  position: relative;
}

.page-about .about-data-list li::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  border-radius: 50%;
  background: var(--orange-hot);
}

/* ===== 我们的团队 ===== */
.page-about .about-team {
  display: grid;
  gap: 28px;
  margin-bottom: 72px;
}

.page-about .about-team-copy h2 {
  margin: 0 0 12px;
  font-family: var(--font-heavy);
  font-size: 28px;
  line-height: 1.12;
}

.page-about .about-team-copy > p {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .about-team-list {
  display: grid;
  gap: 12px;
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
}

.page-about .about-team-list li {
  display: grid;
  gap: 4px;
  background: var(--ink-black);
  color: var(--white);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-team-list li:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-card);
}

.page-about .about-team-list strong {
  font-family: var(--font-heavy);
  font-size: 15px;
  color: var(--orange-hot);
}

.page-about .about-team-list span {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.74);
}

.page-about .about-team-award {
  margin: 0;
  padding: 14px 18px;
  background: var(--white);
  border-left: 4px solid var(--orange-hot);
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .about-team-media {
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

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

/* ===== 延伸阅读 ===== */
.page-about .about-links {
  margin-top: 16px;
}

.page-about .about-links h2 {
  margin: 0 0 24px;
  font-family: var(--font-heavy);
  font-size: 26px;
  line-height: 1.1;
}

.page-about .about-links-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-links-grid a {
  display: block;
  text-decoration: none;
  background: var(--white);
  border: 1px solid var(--line-rule);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .about-links-grid a:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  border-color: var(--red-fire);
}

.page-about .about-links-grid h3 {
  margin: 0 0 6px;
  font-family: var(--font-heavy);
  font-size: 16px;
  line-height: 1.2;
  color: var(--ink-black);
}

.page-about .about-links-grid p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-about.main-content {
    padding: 48px 40px 112px;
  }

  .page-about .about-hero {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 32px;
    align-items: end;
    padding: 56px 48px;
  }

  .page-about .about-hero::before {
    top: 0;
    bottom: 0;
    left: auto;
    width: 46%;
    height: 100%;
    clip-path: polygon(20% 0, 100% 0, 100% 100%, 0 100%);
  }

  .page-about .about-hero-bg-number {
    top: 12px;
    left: 4%;
    font-size: 168px;
  }

  .page-about .about-hero-title {
    font-size: 52px;
  }

  .page-about .about-hero-lead {
    margin-bottom: 32px;
    font-size: 17px;
  }

  .page-about .about-hero-deco {
    margin-top: 0;
    justify-self: end;
    align-self: end;
  }

  .page-about .about-hero-stat {
    padding: 14px 20px;
  }

  .page-about .about-hero-stat strong {
    font-size: 32px;
  }

  .page-about .about-index {
    margin-bottom: 64px;
  }

  .page-about .about-origin {
    grid-template-columns: 1fr 100px;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-origin-inner {
    padding: 40px;
  }

  .page-about .about-origin-side {
    flex-direction: column;
    align-items: flex-end;
    justify-content: flex-start;
    padding-top: 8px;
  }

  .page-about .about-origin-speedlabel {
    writing-mode: vertical-rl;
    text-align: left;
    color: var(--orange-hot);
  }

  .page-about .about-milestones-head {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }

  .page-about .about-milestones-head p {
    text-align: right;
  }

  .page-about .about-timeline {
    gap: 28px;
  }

  .page-about .about-timeline-item {
    grid-template-columns: 120px 32px 1fr;
    gap: 20px;
  }

  .page-about .about-timeline-item::before {
    left: 156px;
  }

  .page-about .about-timeline-meta {
    font-size: 20px;
    padding-top: 12px;
  }

  .page-about .about-timeline-dot {
    margin-top: 22px;
  }

  .page-about .about-timeline-body {
    padding: 24px;
  }

  .page-about .about-timeline-body h3 {
    font-size: 18px;
  }

  .page-about .about-redesign {
    padding: 56px 48px;
  }

  .page-about .about-redesign h2 {
    font-size: 32px;
  }

  .page-about .about-redesign-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-data {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-data-copy h2 {
    font-size: 32px;
  }

  .page-about .about-team {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-team-copy {
    order: 1;
  }

  .page-about .about-team-media {
    order: 2;
  }

  .page-about .about-team-copy h2 {
    font-size: 32px;
  }

  .page-about .about-links-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (min-width: 1024px) {
  .page-about.main-content {
    padding-left: 56px;
    padding-right: 56px;
  }

  .page-about .about-hero-title {
    font-size: 60px;
  }

  .page-about .about-links-grid a {
    padding: 24px;
  }
}