.page-about {
  --about-edge: 22px;
  --about-panel: rgba(18, 53, 36, 0.72);
  --about-dark: #0B1F17;
  --about-border-soft: rgba(46, 107, 69, 0.55);
  position: relative;
  background-color: var(--color-primary-bg);
  color: var(--color-text-light);
  overflow-x: clip;
}

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

.page-about .section-title {
  margin-bottom: var(--space-2);
}

/* ========== 品牌使命首屏 ========== */
.brand-hero {
  position: relative;
  padding: var(--space-2) 0 var(--space-5);
  background:
    linear-gradient(180deg, rgba(11, 31, 23, 0.72) 0%, rgba(10, 46, 30, 0.94) 100%),
    repeating-linear-gradient(-45deg, rgba(47, 107, 69, 0.14) 0 2px, transparent 2px 16px);
}

.brand-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 0 60%, rgba(0, 194, 255, 0.1) 60% 61%, transparent 61%);
  pointer-events: none;
}

.brand-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  background: linear-gradient(100deg, transparent 55%, var(--color-accent) 55% 60%, transparent 60%);
  opacity: 0.85;
}

.brand-hero__grid {
  display: grid;
  gap: var(--space-3);
  align-items: center;
  margin-top: var(--space-3);
}

.brand-hero__kicker {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--color-data);
  text-transform: uppercase;
}

.brand-hero h1 {
  margin: 0 0 var(--space-2);
  max-width: 11em;
  font-family: var(--font-head);
  font-size: clamp(36px, 7vw, 66px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.brand-hero h1 .accent-line {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 5px;
  text-decoration-color: rgba(200, 255, 0, 0.5);
  text-underline-offset: 10px;
}

.brand-hero__lead {
  margin: 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(245, 247, 242, 0.86);
}

.brand-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.brand-hero__figure {
  position: relative;
  margin: 0;
  aspect-ratio: 16 / 9;
  border: 2px solid var(--color-border);
  background: var(--about-dark);
  box-shadow: 8px 8px 0 rgba(11, 31, 23, 0.9);
}

.brand-hero__figure::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid var(--color-accent);
  opacity: 0.5;
  pointer-events: none;
}

.brand-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
}

.stat-cell {
  margin: 0;
  border: 2px solid var(--color-border);
  background: rgba(11, 31, 23, 0.82);
  box-shadow: var(--shadow-hard);
  padding: var(--space-2) var(--space-2);
}

.stat-cell--accent {
  border-color: var(--color-accent);
}

.stat-cell dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(245, 247, 242, 0.72);
}

.stat-cell dd.data-display {
  margin: var(--space-1) 0 0;
  font-size: 26px;
  color: var(--color-accent);
  line-height: 1.1;
}

.stat-cell--accent dd.data-display {
  color: var(--color-data);
}

/* ========== 我们是谁 ========== */
.who-we-are {
  position: relative;
  padding: var(--space-5) 0;
}

.who-we-are__grid {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-3);
  align-items: center;
}

.who-we-are__copy {
  padding: var(--space-3);
  border-left: 4px solid var(--color-accent);
  background: linear-gradient(90deg, rgba(18, 53, 36, 0.68) 0%, rgba(18, 53, 36, 0.16) 74%, transparent 100%);
}

.who-we-are__copy p {
  margin: 0 0 var(--space-2);
  line-height: 1.75;
  color: rgba(245, 247, 242, 0.86);
}

.who-we-are__copy p:last-of-type {
  margin-bottom: 0;
}

.value-list {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.value-list li {
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
  padding-bottom: var(--space-2);
  border-bottom: 1px dashed var(--color-border);
}

.value-list strong {
  color: var(--color-text-light);
}

.value-list__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-data);
  line-height: 1.7;
}

.who-we-are__more {
  display: inline-block;
  margin-top: var(--space-2);
  font-weight: 700;
  text-decoration: none;
}

.who-we-are__figure {
  margin: 0;
  background: var(--about-dark);
  box-shadow: var(--shadow-hard);
}

.who-we-are__figure::after {
  content: "";
  position: absolute;
  right: 10px;
  bottom: 10px;
  width: 70px;
  height: 4px;
  background: var(--color-accent);
}

/* ========== 发展里程碑 ========== */
.milestones {
  position: relative;
  padding: var(--space-5) 0;
  background:
    linear-gradient(110deg, var(--about-dark) 0%, transparent 24%),
    var(--color-primary-bg);
}

.milestones__flow {
  display: block;
  width: 100%;
  height: 48px;
  margin: var(--space-2) 0 var(--space-1);
}

.timeline {
  position: relative;
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
  max-width: 1020px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 9px;
  width: 2px;
  height: calc(100% - 8px);
  background: linear-gradient(to bottom, transparent, var(--color-accent) 8%, var(--color-data) 72%, transparent);
}

.timeline__item {
  position: relative;
  margin-bottom: var(--space-4);
  padding-left: 30px;
}

.timeline__item:last-child {
  margin-bottom: 0;
}

.timeline__marker {
  position: absolute;
  left: 1px;
  top: 6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--about-dark);
  border: 3px solid var(--color-accent);
  box-shadow: 0 0 0 5px rgba(200, 255, 0, 0.22);
}

.timeline__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--color-data);
  border: 1px solid var(--color-border);
  background: rgba(11, 31, 23, 0.72);
  padding: 5px 10px;
  text-transform: uppercase;
}

.timeline__card {
  margin-top: var(--space-1);
  padding: var(--space-2) var(--space-3);
  background: var(--about-panel);
  border: 2px solid var(--color-border);
  box-shadow: 4px 4px 0 rgba(11, 31, 23, 0.82);
}

.timeline__card h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 20px;
  line-height: 1.35;
  color: var(--color-text-light);
}

.timeline__card p {
  margin: 0;
  line-height: 1.65;
  font-size: 15px;
  color: rgba(245, 247, 242, 0.78);
}

/* ========== 核心能力 ========== */
.capabilities {
  position: relative;
  padding: var(--space-5) 0;
  overflow: hidden;
}

.capabilities::before {
  content: "";
  position: absolute;
  inset: -8% -4%;
  background:
    linear-gradient(16deg, var(--about-dark) 0 12%, transparent 12%),
    linear-gradient(-14deg, rgba(18, 53, 36, 0.92) 0 34%, transparent 34%);
  pointer-events: none;
}

.caps-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.cap-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--space-2);
  min-width: 0;
  background: var(--about-panel);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-hard);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.cap-card:hover,
.cap-card:focus-within {
  transform: translate(-2px, -2px);
  border-color: var(--color-accent);
}

.cap-card--accent {
  background: linear-gradient(135deg, rgba(200, 255, 0, 0.2) 0%, rgba(18, 53, 36, 0.92) 60%);
  border-color: var(--color-accent);
}

.cap-card__index {
  position: absolute;
  top: var(--space-1);
  right: var(--space-1);
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(245, 247, 242, 0.46);
}

.cap-card h3 {
  margin: var(--space-2) 0 4px;
  font-family: var(--font-head);
  font-size: 18px;
  line-height: 1.3;
}

.cap-card__metric {
  margin: var(--space-1) 0 4px;
  font-size: 30px;
  line-height: 1;
  color: var(--color-accent);
  word-break: keep-all;
}

.cap-card:not(.cap-card--accent) .cap-card__metric {
  color: var(--color-data);
}

.cap-card__unit {
  font-size: 15px;
  font-family: var(--font-body);
  color: rgba(245, 247, 242, 0.72);
  margin-left: 4px;
}

.cap-card__caption {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-light);
}

.cap-card__note {
  margin: var(--space-1) 0 0;
  font-size: 13px;
  line-height: 1.55;
  color: rgba(245, 247, 242, 0.7);
}

/* ========== 服务承诺 ========== */
.commitments {
  position: relative;
  padding: var(--space-5) 0;
}

.commitments__quote {
  position: relative;
  margin: var(--space-3) 0;
  padding: var(--space-3);
  border: 2px solid var(--color-border);
  border-left: 6px solid var(--color-accent);
  background: rgba(11, 31, 23, 0.82);
  box-shadow: var(--shadow-hard);
}

.commitments__quote p {
  margin: 0;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(245, 247, 242, 0.9);
}

.commitments__grid {
  display: grid;
  gap: var(--space-2);
}

.com-card {
  position: relative;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  background: var(--about-panel);
}

.com-card__icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: var(--space-2);
  background: var(--about-dark);
  border: 2px solid var(--color-accent);
}

.com-card h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 19px;
  line-height: 1.3;
}

.com-card p {
  margin: 0;
  line-height: 1.7;
  font-size: 15px;
  color: rgba(245, 247, 242, 0.76);
}

/* ========== 团队概况 ========== */
.team {
  position: relative;
  padding: var(--space-5) 0;
  background: linear-gradient(125deg, var(--about-dark) 0%, rgba(10, 46, 30, 0.98) 48%, rgba(18, 53, 36, 0.9) 100%);
}

.team__grid {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-3);
  align-items: center;
}

.team__figure {
  margin: 0;
  background: #0C1A14;
  box-shadow: var(--shadow-hard);
}

.team__lead {
  margin: 0 0 var(--space-2);
  font-size: 22px;
  font-weight: 800;
  line-height: 1.45;
}

.team__disciplines {
  list-style: none;
  margin: 0 0 var(--space-3);
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.team__disciplines li {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: var(--space-2);
  padding: var(--space-2);
  background: rgba(18, 53, 36, 0.62);
  border-left: 3px solid var(--color-data);
  font-size: 14px;
  line-height: 1.6;
}

.team__disciplines span:first-child {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
}

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0 0 var(--space-3);
  padding: 0;
}

/* ========== 继续了解 ========== */
.brand-cta {
  position: relative;
  padding: var(--space-5) 0 var(--space-6);
}

.brand-cta__inner {
  padding: var(--space-3);
  border: 2px solid var(--color-border);
  background: linear-gradient(135deg, rgba(18, 53, 36, 0.96) 0%, rgba(11, 31, 23, 0.68) 100%);
  box-shadow: var(--shadow-hard);
}

.brand-cta__kicker {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--color-data);
  text-transform: uppercase;
}

.brand-cta__links {
  display: grid;
  gap: var(--space-2);
}

.brand-cta__link {
  display: grid;
  gap: 3px;
  padding: var(--space-2);
  background: rgba(10, 46, 30, 0.68);
  border: 1px solid var(--color-border);
  color: var(--color-text-light);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), background 0.2s var(--ease);
}

.brand-cta__link:hover,
.brand-cta__link:focus-visible {
  border-color: var(--color-accent);
  background: rgba(18, 53, 36, 0.95);
  transform: translateY(-2px);
  outline: none;
}

.brand-cta__index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-data);
}

.brand-cta__name {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 800;
}

.brand-cta__desc {
  font-size: 13px;
  color: rgba(245, 247, 242, 0.74);
}

.brand-cta__contact {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-2);
  border-top: 1px dashed var(--color-border);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 247, 242, 0.72);
}

/* ========== 动画 ========== */
@media (prefers-reduced-motion: no-preference) {
  .page-about .timeline__item {
    animation: pageAboutFade 0.55s var(--ease) both;
  }

  .page-about .timeline__item:nth-child(2) {
    animation-delay: 0.06s;
  }

  .page-about .timeline__item:nth-child(3) {
    animation-delay: 0.12s;
  }

  .page-about .timeline__item:nth-child(4) {
    animation-delay: 0.18s;
  }

  .page-about .timeline__item:nth-child(5) {
    animation-delay: 0.24s;
  }

  .page-about .timeline__item:nth-child(6) {
    animation-delay: 0.3s;
  }

  @supports (animation-timeline: view()) {
    .page-about .timeline__item {
      animation-name: pageAboutRise;
      animation-duration: 1s;
      animation-delay: 0s;
      animation-timing-function: linear;
      animation-timeline: view();
      animation-range: entry 12% cover 28%;
    }
  }
}

@keyframes pageAboutFade {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes pageAboutRise {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ========== 响应式 ========== */
@media (min-width: 640px) {
  .brand-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .stat-cell {
    padding: var(--space-2) var(--space-3);
  }

  .caps-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .commitments__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .brand-cta__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .brand-hero {
    padding-top: var(--space-3);
  }

  .brand-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: var(--space-5);
  }

  .brand-hero__figure {
    transform: rotate(-2.4deg);
  }

  .who-we-are__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: var(--space-4);
  }

  .timeline__item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 120px minmax(0, 1fr);
    column-gap: var(--space-3);
    align-items: center;
    margin-bottom: var(--space-3);
    padding-left: 0;
  }

  .timeline__marker {
    position: relative;
    left: auto;
    top: auto;
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
  }

  .timeline__badge {
    grid-column: 3;
    grid-row: 1;
    justify-self: start;
  }

  .timeline__card {
    grid-column: 1;
    grid-row: 1;
    margin-top: 0;
    text-align: right;
  }

  .timeline__item:nth-child(even) .timeline__badge {
    grid-column: 1;
    grid-row: 1;
    justify-self: end;
  }

  .timeline__item:nth-child(even) .timeline__card {
    grid-column: 3;
    text-align: left;
  }

  .capabilities::before {
    inset: -6% -3%;
  }

  .caps-grid {
    gap: var(--space-3);
  }

  .cap-card {
    padding: var(--space-3);
  }

  .cap-card h3 {
    font-size: 20px;
  }

  .cap-card__metric {
    font-size: 36px;
  }

  .commitments__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .team__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: var(--space-4);
  }

  .brand-cta__inner {
    padding: var(--space-4);
  }

  .brand-cta__links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}