.page-about {
  --about-section: clamp(48px, 8vw, 96px);
  --about-gap: clamp(16px, 2.6vw, 28px);
  background: var(--deep-900);
  color: var(--bone-050);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .container {
  padding-inline: clamp(16px, 4.5vw, 40px);
}

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

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--rock-500);
}

.page-about .about-kicker::before {
  content: "";
  display: block;
  width: 24px;
  height: 2px;
  background: var(--coral-500);
}

.page-about .about-kicker--dark {
  color: rgba(20, 24, 26, 0.55);
}

.page-about .about-h2 {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--bone-050);
}

.page-about .about-h2--dark {
  color: var(--ink-900);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: clamp(10px, 2vw, 18px) 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--rock-500);
}

.page-about .breadcrumb a {
  color: var(--rock-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyber-400);
  border-bottom-color: var(--cyber-400);
}

.page-about .breadcrumb__sep {
  opacity: 0.5;
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--text-dim);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 52px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-size: clamp(1.85rem, 6.4vw, 3.4rem);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--bone-050);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 33em;
  font-size: clamp(0.98rem, 1.8vw, 1.05rem);
  color: var(--text-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--deep-700);
  min-height: 200px;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-hero__stamp {
  position: absolute;
  left: 14px;
  bottom: 14px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 100px;
  background: rgba(11, 30, 45, 0.76);
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

.page-about .about-hero__stamp-num {
  font-size: 14px;
  color: var(--cyber-400);
}

.page-about .about-hero__chips {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-chip {
  padding: 14px 14px 16px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--deep-700);
}

.page-about .about-chip__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 4vw, 1.85rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--cyber-400);
}

.page-about .about-chip__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-mute);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }

  .page-about .about-hero__statement {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-hero__chips {
    grid-column: 1;
    grid-row: 2;
    align-self: end;
  }

  .page-about .about-hero__figure {
    grid-column: 2;
    grid-row: 1 / span 2;
    display: flex;
  }

  .page-about .about-hero__figure img {
    position: absolute;
    inset: 0;
    height: 100%;
    aspect-ratio: auto;
  }
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin {
  margin-top: var(--about-section);
  padding: clamp(26px, 5vw, 54px) clamp(20px, 4vw, 48px);
  border-radius: var(--radius-l);
  background: var(--bone-050);
  color: var(--ink-900);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(18px, 3vw, 38px);
}

.page-about .about-origin__body p {
  margin: 0;
  font-size: clamp(0.95rem, 1.7vw, 1rem);
  color: rgba(20, 24, 26, 0.78);
}

.page-about .about-origin__body p + p {
  margin-top: 14px;
}

.page-about .about-origin__body p:first-child {
  font-size: clamp(1.02rem, 2vw, 1.12rem);
  line-height: 1.7;
  color: var(--ink-900);
}

@media (min-width: 880px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: var(--about-section);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
}

.page-about .about-team__lede {
  margin: 0;
  max-width: 30em;
  font-size: clamp(0.96rem, 1.7vw, 1.02rem);
  color: var(--text-dim);
}

.page-about .about-team__figure {
  margin: clamp(18px, 3vw, 26px) 0 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--deep-700);
}

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

.page-about .about-team__figure figcaption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-mute);
}

.page-about .team-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(18, 50, 71, 0.66);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .team-card + .team-card {
  margin-top: 12px;
}

.page-about .team-card[open] {
  border-color: var(--line-strong);
  background: var(--deep-700);
}

.page-about .team-card > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .team-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .team-card > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyber-400);
  transition: color 0.2s var(--ease);
}

.page-about .team-card[open] > summary::after {
  content: "−";
}

.page-about .team-card__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--coral-500);
}

.page-about .team-card__name {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--bone-050);
}

.page-about .team-card__body {
  padding: 0 16px 16px;
}

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

@media (min-width: 940px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }
}

/* ---------- 流程 ---------- */
.page-about .about-process {
  margin-top: var(--about-section);
}

.page-about .flow {
  margin: clamp(18px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .flow__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.6vw, 1.9rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--cyber-400);
}

.page-about .flow__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--bone-050);
}

.page-about .flow__text {
  margin: 0;
  font-size: 15px;
  color: var(--text-dim);
}

@media (min-width: 860px) {
  .page-about .flow {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px;
    border-top: 0;
    background: var(--line);
    border-radius: var(--radius-m);
    overflow: hidden;
  }

  .page-about .flow__step {
    display: block;
    padding: 22px 18px;
    border-bottom: 0;
    background: var(--deep-900);
  }

  .page-about .flow__num {
    display: block;
    margin-bottom: 12px;
  }

  .page-about .flow__text {
    margin-top: 6px;
  }
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones {
  margin-top: var(--about-section);
}

.page-about .milestones__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .milestone-list {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .milestone-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 20px;
  bottom: 20px;
  width: 1px;
  background: rgba(107, 124, 133, 0.34);
}

.page-about .milestone {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.page-about .milestone:last-child {
  border-bottom: 0;
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--coral-500);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, 0.14);
}

.page-about .milestone > details > summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .milestone > details > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--rock-500);
}

.page-about .milestone > details[open] > summary::after {
  content: "−";
}

.page-about .milestone__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyber-400);
}

.page-about .milestone__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--bone-050);
}

.page-about .milestone__body {
  padding: 0 0 16px;
}

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

.page-about .milestones__figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--deep-700);
}

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

.page-about .milestones__figure figcaption {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-mute);
}

@media (min-width: 900px) {
  .page-about .milestones__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

/* ---------- 价值 ---------- */
.page-about .about-value {
  margin-top: var(--about-section);
}

.page-about .about-value__grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .value-card {
  border-radius: var(--radius-m);
  background: var(--paper-100);
  color: var(--ink-900);
  border: 1px solid rgba(20, 24, 26, 0.08);
}

.page-about .value-card > summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .value-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .value-card > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--clay-500);
}

.page-about .value-card[open] > summary::after {
  content: "−";
}

.page-about .value-card__title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--ink-900);
}

.page-about .value-card__body {
  padding: 0 18px 18px;
}

.page-about .value-card__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(20, 24, 26, 0.74);
}

@media (min-width: 780px) {
  .page-about .about-value__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 尾部入口 ---------- */
.page-about .about-next {
  margin-top: var(--about-section);
  padding-top: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__links {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(18, 50, 71, 0.5);
  text-decoration: none;
  color: var(--bone-050);
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-next__link strong {
  font-size: 1rem;
  font-weight: 500;
}

.page-about .about-next__link span {
  font-size: 13px;
  color: var(--text-mute);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--line-strong);
  background: var(--deep-700);
  transform: translateY(-2px);
}

@media (min-width: 760px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__link,
  .page-about .team-card,
  .page-about .breadcrumb a,
  .page-about .team-card > summary::after {
    transition: none;
  }

  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}