.page-about {
  background: var(--paper);
  color: var(--ink);
  letter-spacing: -0.01em;
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumbs {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: calc(var(--gutter) * 0.625) var(--gutter) 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumbs a:hover {
  color: var(--flame);
}

.page-about .breadcrumbs span[aria-current="page"] {
  color: var(--ink);
}

.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 900;
  margin: 0;
}

.page-about__section-head {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 2.25rem;
}

.page-about__section-head h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.05;
}

.page-about__section-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--flame);
  background: rgba(255, 75, 31, 0.08);
  border: 1px solid rgba(255, 75, 31, 0.22);
  padding: 0.35em 0.75em;
  letter-spacing: 0.08em;
}

.page-about__section-head .section__kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.375rem;
}

.page-about__section-head .section__lede {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--muted);
  max-width: 38em;
  margin: 0.75rem 0 0;
}

/* ===== 首屏 ===== */
.page-about__hero {
  background: var(--cobalt);
  color: #ffffff;
  position: relative;
  overflow: hidden;
  padding: calc(var(--gutter) * 1.5) 0;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  right: -12%;
  top: 18%;
  width: 58%;
  height: 48%;
  background: linear-gradient(120deg, transparent 20%, rgba(255, 75, 31, 0.4) 55%, rgba(0, 229, 255, 0.22) 100%);
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about__hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

.page-about__hero-copy {
  position: relative;
  z-index: 2;
}

.page-about__hero-kicker {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--volt);
  margin: 0 0 1.25rem;
}

.page-about__hero-kicker span {
  display: block;
  width: 2.75rem;
  height: 1px;
  background: var(--volt);
}

.page-about__hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7vw, 4.25rem);
  line-height: 1.02;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  color: #ffffff;
  margin: 0 0 1.5rem;
  max-width: 11em;
}

.page-about__hero-lede {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.86);
  max-width: 36em;
  margin: 0 0 1.75rem;
}

.page-about__hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2.5rem;
  margin: 0;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.page-about__hero-stats div {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about__hero-stats dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

.page-about__hero-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--volt);
}

.page-about__hero-art {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 1rem;
}

.page-about__hero-art::before {
  content: "";
  position: absolute;
  right: -1rem;
  bottom: -1rem;
  width: 7.5rem;
  height: 7.5rem;
  background: var(--flame);
  border-radius: 4px;
  opacity: 0.7;
  transform: rotate(12deg);
  z-index: -1;
}

.page-about__hero-vertical {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.48);
  line-height: 1.5;
  white-space: nowrap;
}

.page-about__hero-art img {
  display: block;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.25);
}

/* ===== 品牌序言 ===== */
.page-about__preface {
  padding: calc(var(--gutter) * 2) 0;
}

.page-about__preface .page-about__preface-body {
  max-width: 44em;
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(0rem, 6vw, 2rem);
  font-size: 1rem;
  line-height: 1.75;
}

.page-about__preface-lead {
  font-size: 1.375rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
  margin: 0 0 1.25rem;
}

.page-about__preface-body p {
  margin: 0 0 1.125rem;
  color: #3a3a3a;
}

.page-about__preface-body blockquote {
  margin: 2rem 0 0;
  padding: 1.25rem 1.5rem;
  border-left: 3px solid var(--flame);
  background: var(--paper-deep);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--ink);
}

/* ===== 发展历程 ===== */
.page-about__timeline {
  padding: calc(var(--gutter) * 2) 0;
  background: var(--paper-deep);
}

.page-about__timeline-wrap {
  position: relative;
  margin-left: 0.75rem;
}

.page-about__timeline-rail {
  position: absolute;
  left: 1.25rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--flame), var(--cyan), var(--cobalt-soft));
  border-radius: 2px;
}

.page-about__timeline-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 3rem;
}

.page-about__timeline-item {
  position: relative;
  margin-bottom: 1.75rem;
}

.page-about__timeline-dot {
  position: absolute;
  left: -2rem;
  top: 0.625rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--flame);
  border: 2px solid var(--paper-deep);
  box-shadow: 0 0 0 2px rgba(255, 75, 31, 0.3);
}

.page-about__timeline-card {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about__timeline-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(20, 20, 20, 0.08);
}

.page-about__timeline-era {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--flame);
  margin: 0 0 0.5rem;
}

.page-about__timeline-card h3 {
  font-size: 1.25rem;
  line-height: 1.2;
  margin: 0 0 0.5rem;
}

.page-about__timeline-card p:last-child {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
}

.page-about__timeline-map {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  align-items: center;
  margin-top: 2.5rem;
  padding: 1.25rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--flame);
}

.page-about__timeline-map img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: 4px;
}

.page-about__timeline-map p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink);
  margin: 0;
}

/* ===== 团队与文化 ===== */
.page-about__team {
  padding: calc(var(--gutter) * 2) 0;
}

.page-about__team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about__team-card {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about__team-card:hover {
  transform: translateY(-4px);
  border-color: var(--flame);
}

.page-about__team-glyph {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--paper-deep);
  margin-bottom: 1.25rem;
}

.page-about__team-glyph svg {
  width: 42px;
  height: 42px;
}

.page-about__team-glyph--engineer {
  color: var(--flame);
  background: rgba(255, 75, 31, 0.08);
}

.page-about__team-glyph--pm {
  color: var(--cobalt);
  background: rgba(15, 42, 74, 0.06);
}

.page-about__team-glyph--editor {
  color: var(--deep-cyan);
  background: rgba(0, 194, 199, 0.08);
}

.page-about__team-card h3 {
  font-size: 1.3125rem;
  margin-bottom: 0.625rem;
}

.page-about__team-card p {
  font-size: 0.906rem;
  line-height: 1.65;
  color: var(--muted);
  margin: 0;
}

.page-about__team-note {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
  margin-top: 2.25rem;
  padding: 1.5rem;
  background: var(--card);
  border: 1px solid var(--line);
}

.page-about__team-note img {
  border-radius: 4px;
  width: 100%;
  object-fit: cover;
}

.page-about__team-note-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.375rem;
  margin: 0 0 0.75rem;
}

.page-about__team-note-body p:last-child {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

/* ===== 数据承诺 ===== */
.page-about__commitment {
  background: var(--cobalt);
  color: #ffffff;
  padding: calc(var(--gutter) * 2) 0;
}

.page-about__commitment .page-about__section-index {
  background: rgba(204, 255, 0, 0.08);
  border-color: rgba(204, 255, 0, 0.25);
  color: var(--volt);
}

.page-about__commitment h2 {
  color: #ffffff;
}

.page-about__commitment .section__kicker {
  color: var(--volt);
}

.page-about__commitment-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.page-about__commitment-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 1.75rem 1.5rem;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about__commitment-card:hover {
  background: rgba(255, 255, 255, 0.1);
}

.page-about__commitment-card--hot {
  border-color: rgba(255, 75, 31, 0.45);
  background: rgba(255, 75, 31, 0.08);
}

.page-about__commitment-card .data-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.62);
  margin: 0 0 0.375rem;
}

.page-about__commitment-card .display-number {
  font-family: var(--font-mono);
  font-size: 3.25rem;
  font-weight: 700;
  line-height: 1;
  color: var(--volt);
  margin: 0 0 0.5rem;
}

.page-about__commitment-card--hot .display-number {
  color: var(--flame);
}

.page-about__commitment-desc {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.66);
  margin: 0;
}

.page-about__commitment-steps {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about__commitment-steps h3 {
  color: #ffffff;
  font-size: 1.625rem;
  margin: 0 0 1.5rem;
}

.page-about__commitment-steps ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.875rem;
}

.page-about__commitment-steps li {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1rem 1.25rem;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about__commitment-steps li:hover {
  border-color: rgba(204, 255, 0, 0.45);
  background: rgba(204, 255, 0, 0.06);
}

.page-about__commitment-steps li span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--volt);
  background: rgba(204, 255, 0, 0.1);
  border: 1px solid rgba(204, 255, 0, 0.25);
  padding: 0.3em 0.6em;
}

.page-about__commitment-steps li p {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 600;
  color: #ffffff;
}

.page-about__commitment-tip {
  margin: 1.5rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.02em;
}

/* ===== 展览标签 ===== */
.page-about__labels {
  padding: calc(var(--gutter) * 2) 0;
}

.page-about__labels-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
  padding: 0.5rem 0 0;
}

.page-about__labels-list a {
  text-decoration: none;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about__labels-list a:hover {
  transform: translateY(-3px);
}

/* ===== 页尾延伸 ===== */
.page-about__more {
  background: var(--paper-deep);
  padding: calc(var(--gutter) * 1.5) 0;
}

.page-about__more .container {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
}

.page-about__more-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.375rem;
  margin: 0;
}

.page-about__more-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    padding: calc(var(--gutter) * 2.5) 0;
  }

  .page-about__hero-inner {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
  }

  .page-about__hero-art {
    justify-items: end;
  }

  .page-about__hero-art img {
    width: 100%;
    max-width: 420px;
  }

  .page-about__hero-vertical {
    font-size: 0.75rem;
  }

  .page-about__preface .page-about__preface-body {
    padding-left: clamp(0rem, 8vw, 3rem);
  }

  .page-about__timeline-wrap {
    margin-left: 0;
  }

  .page-about__timeline-rail {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about__timeline-list {
    padding: 0;
  }

  .page-about__timeline-item {
    width: 50%;
    padding: 0 3rem 2.25rem 0;
    margin-bottom: 0;
    text-align: right;
  }

  .page-about__timeline-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 2.25rem 3rem;
    text-align: left;
  }

  .page-about__timeline-dot {
    left: auto;
    right: -5px;
    top: 0.75rem;
  }

  .page-about__timeline-item:nth-child(even) .page-about__timeline-dot {
    right: auto;
    left: -5px;
  }

  .page-about__timeline-card {
    padding: 1.75rem;
  }

  .page-about__timeline-map {
    grid-template-columns: minmax(220px, 340px) 1fr;
    gap: 2rem;
    margin-top: 3rem;
    padding: 1.75rem;
  }

  .page-about__timeline-map img {
    max-height: 420px;
  }

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

  .page-about__team-note {
    grid-template-columns: 1.1fr 1fr;
    margin-top: 3rem;
    padding: 2rem;
  }

  .page-about__commitment-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .page-about__commitment-steps ol {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about__commitment-steps li {
    padding: 1.25rem 1.5rem;
  }

  .page-about__section-head {
    gap: 1.75rem;
    margin-bottom: 3rem;
  }
}

@media (min-width: 1024px) {
  .page-about__hero h1 {
    font-size: clamp(3rem, 5.5vw, 4.5rem);
  }

  .page-about__hero-lede {
    font-size: 1.125rem;
  }

  .page-about__timeline-item {
    padding-right: 4rem;
  }

  .page-about__timeline-item:nth-child(even) {
    padding-left: 4rem;
  }

  .page-about__timeline-card {
    padding: 2rem;
  }

  .page-about__more .container {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about__more-title {
    font-size: 1.625rem;
  }
}