.page-about {
  font-family: var(--font-body);
  color: var(--text-body);
  line-height: 1.75;
  position: relative;
  overflow-x: hidden;
}

/* ── Hero 区 ─────────────────────────── */
.about-hero {
  position: relative;
  padding: clamp(2.5rem, 6vw, 5rem) var(--space-block) 0;
  max-width: var(--container-max);
  margin: 0 auto;
  isolation: isolate;
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 80% 15%, rgba(0, 230, 138, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 5% 85%, rgba(255, 107, 53, 0.06) 0%, transparent 50%);
  z-index: -1;
}

.about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 46%;
  height: 100%;
  background: linear-gradient(135deg, transparent 22%, rgba(27, 33, 77, 0.70) 100%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  z-index: -1;
}

.about-hero__inner {
  position: relative;
}

.about-hero__kicker {
  font-size: var(--text-caption);
  letter-spacing: 0.22em;
  color: var(--accent-green);
  margin: 2rem 0 0.75rem;
  text-transform: uppercase;
}

.about-hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 900;
  line-height: 1.12;
  color: var(--text-title);
  margin: 0 0 1.5rem;
  letter-spacing: -0.02em;
  max-width: 12em;
}

.about-hero__lead {
  font-size: 1.05rem;
  color: var(--text-body);
  max-width: 46rem;
  margin: 0 0 2rem;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-bottom: clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--line-grid);
}

/* ── 通用章节编号 ────────────────────── */
.about-section__num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.16em;
  color: var(--accent-green);
  text-transform: uppercase;
  margin: 0 0 0.75rem;
  display: block;
}

.about-intro__content h2,
.about-capacity__header h2,
.about-milestones__intro h2,
.about-team__header h2,
.about-credentials__header h2 {
  font-family: var(--font-display);
  font-size: var(--text-section);
  font-weight: 900;
  color: var(--text-title);
  line-height: 1.2;
  margin: 0 0 1.5rem;
  letter-spacing: -0.01em;
}

/* ── 01 关于 ─────────────────────────── */
.about-intro__grid {
  display: grid;
  gap: 2rem;
  max-width: var(--container-max);
  margin: 0 auto;
  align-items: center;
}

.about-intro__content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.about-intro__content p {
  margin: 0 0 1rem;
}

.about-intro__content .btn {
  margin-top: 0.5rem;
}

.about-intro__figure {
  margin: 0;
}

.about-intro__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 12px;
  border: var(--border-panel);
  display: block;
  box-shadow: var(--shadow-panel);
}

.about-intro__figure figcaption {
  font-size: var(--text-caption);
  color: var(--text-muted);
  margin-top: 0.75rem;
  text-align: right;
}

/* ── 02 数据能力 ─────────────────────── */
.about-capacity {
  padding: var(--space-section) var(--space-block);
  max-width: var(--container-max);
  margin: 0 auto;
}

.about-capacity__header {
  max-width: 52rem;
}

.about-capacity__lead {
  font-size: 1.05rem;
}

.about-capacity__canvas {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2.5rem;
}

.about-capacity__cell {
  position: relative;
  background:
    linear-gradient(rgba(30, 42, 74, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 42, 74, 0.3) 1px, transparent 1px),
    var(--bg-secondary);
  background-size: 26px 26px, 26px 26px, auto;
  border: 1px solid var(--line-grid);
  padding: 1.75rem 1.5rem;
  overflow: hidden;
  border-radius: 10px;
  transition: border-color 0.2s, transform 0.2s;
}

.about-capacity__cell:hover {
  border-color: rgba(0, 230, 138, 0.4);
}

.about-capacity__cell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-green), transparent);
}

.about-capacity__cell:nth-child(2)::before {
  background: linear-gradient(90deg, var(--accent-orange), var(--accent-green));
}

.about-capacity__cell:nth-child(3)::before {
  background: linear-gradient(90deg, var(--accent-green), var(--accent-orange));
}

.about-capacity__cell:nth-child(4)::before {
  background: linear-gradient(90deg, var(--accent-orange), transparent);
}

.about-capacity__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--text-title);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.about-capacity__unit {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sub);
  color: var(--text-title);
  margin-top: 0.5rem;
}

.about-capacity__detail {
  display: block;
  font-size: var(--text-caption);
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.about-capacity__footnote {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line-grid);
  font-size: var(--text-caption);
  color: var(--text-muted);
  letter-spacing: 0.14em;
}

/* ── 03 里程碑 ───────────────────────── */
.about-milestones__container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.about-milestones__intro {
  max-width: 44rem;
}

.about-milestones__intro p:not(.about-section__num) {
  font-size: 1.05rem;
}

.about-milestones__timeline {
  margin-top: 2.5rem;
}

.about-milestones__item {
  position: relative;
  padding: 0 0 2rem 2.5rem;
}

.about-milestones__item::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 0 4px rgba(0, 230, 138, 0.15);
}

.about-milestones__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 16px;
  top: 22px;
  bottom: -0.9rem;
  width: 2px;
  background: rgba(255, 255, 255, 0.14);
}

.about-milestones__item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 0.25rem 0;
}

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

.about-milestones__item summary::marker {
  display: none;
}

.about-milestones__year {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--accent-green);
  letter-spacing: 0.12em;
  margin-bottom: 0.2rem;
}

.about-milestones__title {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sub);
  color: var(--text-title);
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.about-milestones__item summary:hover .about-milestones__title {
  color: var(--accent-green);
  border-bottom-color: var(--accent-green);
}

.about-milestones__item[open] .about-milestones__title {
  color: var(--accent-green);
}

.about-milestones__detail {
  margin-top: 0.75rem;
  padding: 1rem 1.25rem;
  background: rgba(7, 17, 38, 0.72);
  border-left: 3px solid var(--accent-green);
  border-radius: 0 8px 8px 0;
  font-size: 0.95rem;
}

.about-milestones__detail p {
  margin: 0;
}

.about-milestones__item[open] .about-milestones__detail {
  animation: page-about-fade-in 0.25s ease-out;
}

@keyframes page-about-fade-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.about-milestones__figure {
  margin: 2.5rem 0 0;
}

.about-milestones__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 12px;
  border: var(--border-panel);
  display: block;
  box-shadow: var(--shadow-panel);
}

.about-milestones__figure figcaption {
  font-size: var(--text-caption);
  color: var(--text-muted);
  margin-top: 0.75rem;
  text-align: right;
}

/* ── 04 团队与治理 ───────────────────── */
.about-team__container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.about-team__header {
  max-width: 48rem;
}

.about-team__header p:not(.about-section__num) {
  font-size: 1.05rem;
}

.about-team__roles {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.about-team__role {
  background: rgba(7, 17, 38, 0.78);
  border: 1px solid var(--line-grid);
  border-left: 3px solid var(--accent-green);
  padding: 1.5rem;
  position: relative;
  border-radius: 4px 10px 10px 4px;
  transition: border-color 0.2s, transform 0.2s;
}

.about-team__role:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 230, 138, 0.45);
}

.about-team__role::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, transparent 50%, rgba(0, 230, 138, 0.22) 50%);
  border-radius: 0 0 0 8px;
}

.about-team__role h3 {
  font-family: var(--font-display);
  font-size: var(--text-sub);
  font-weight: 700;
  color: var(--text-title);
  margin: 0 0 0.5rem;
}

.about-team__role p {
  font-size: 0.95rem;
  color: var(--text-body);
  margin: 0;
}

.about-team__governance {
  margin-top: 3rem;
  background: rgba(7, 17, 38, 0.78);
  border: 1px solid var(--line-grid);
  padding: 1.75rem;
  border-radius: 10px;
}

.about-team__governance h3 {
  font-family: var(--font-display);
  font-size: var(--text-sub);
  font-weight: 700;
  color: var(--text-title);
  margin: 0 0 1rem;
}

.about-team__process {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  counter-reset: team-step;
}

.about-team__step {
  background: var(--bg-secondary);
  border: 1px solid var(--line-grid);
  padding: 1.25rem;
  border-radius: 8px;
}

.about-team__step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent-orange);
  line-height: 1;
}

.about-team__step h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-title);
  margin: 0.5rem 0 0.25rem;
}

.about-team__step p {
  font-size: var(--text-caption);
  color: var(--text-muted);
  margin: 0;
}

.about-team__note {
  margin-top: 1rem;
  font-size: var(--text-caption);
  color: var(--text-muted);
}

.about-team__figure {
  margin: 2.5rem 0 0;
}

.about-team__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 12px;
  border: var(--border-panel);
  display: block;
  box-shadow: var(--shadow-panel);
}

.about-team__figure figcaption {
  font-size: var(--text-caption);
  color: var(--text-muted);
  margin-top: 0.75rem;
}

/* ── 05 资质与荣誉 ───────────────────── */
.about-credentials {
  padding: var(--space-section) var(--space-block);
  max-width: var(--container-max);
  margin: 0 auto;
}

.about-credentials__header {
  max-width: 50rem;
}

.about-credentials__header p:not(.about-section__num) {
  font-size: 1.05rem;
}

.about-credentials__grid {
  display: grid;
  gap: 1rem;
  margin-top: 2.5rem;
}

.about-credentials__item {
  background: var(--bg-secondary);
  border: 1px solid var(--line-grid);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  position: relative;
  border-radius: 10px;
  transition: border-color 0.2s, transform 0.2s;
}

.about-credentials__item:hover {
  border-color: rgba(0, 230, 138, 0.5);
  transform: translateY(-3px);
}

.about-credentials__icon {
  width: 44px;
  height: 44px;
  color: var(--accent-green);
  flex-shrink: 0;
}

.about-credentials__item h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-title);
  margin: 0;
}

.about-credentials__item p {
  font-size: 0.95rem;
  color: var(--text-body);
  margin: 0;
}

.about-credentials__footer {
  margin-top: 2rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-secondary);
  border-left: 3px solid var(--accent-green);
  border-radius: 0 10px 10px 0;
}

.about-credentials__footer p {
  margin: 0;
}

.about-credentials__footer a {
  color: var(--accent-green);
  text-decoration: none;
}

.about-credentials__footer a:hover {
  text-decoration: underline;
}

/* ── 响应式增强 ─────────────────────── */
@media (min-width: 700px) {
  .about-intro__grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

  .about-intro__figure {
    align-self: stretch;
  }

  .about-intro__figure img {
    height: 100%;
    min-height: 360px;
    object-fit: cover;
  }

  .about-capacity__canvas {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .about-team__roles {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .about-team__process {
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
  }

  .about-credentials__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

@media (min-width: 1100px) {
  .about-hero__lead {
    max-width: 52rem;
  }

  .about-capacity__canvas {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
  }

  .about-capacity__cell:nth-child(even) {
    transform: translateY(2.5rem);
  }

  .about-capacity__cell:nth-child(even):hover {
    transform: translateY(2.5rem) translateY(-3px);
  }

  .about-milestones__timeline {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    position: relative;
    padding-top: 2rem;
  }

  .about-milestones__timeline::before {
    content: "";
    position: absolute;
    top: 2rem;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(0, 230, 138, 0.55) 15%, rgba(0, 230, 138, 0.55) 85%, transparent);
  }

  .about-milestones__item {
    padding: 0;
  }

  .about-milestones__item::before {
    left: 50%;
    top: -7px;
    transform: translateX(-50%);
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 3px solid var(--accent-green);
    box-shadow: 0 0 0 5px rgba(0, 230, 138, 0.12);
  }

  .about-milestones__item:not(:last-child)::after {
    display: none;
  }

  .about-milestones__item summary {
    padding: 0.5rem 0.25rem 1rem;
  }

  .about-milestones__figure {
    margin-top: 3rem;
  }

  .about-team__governance {
    padding: 2.25rem;
  }

  .about-credentials__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

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