.page-about .about-hero {
  position: relative;
  padding: 2.25rem 0 3.25rem;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -6% -1px -6%;
  height: 72px;
  background: linear-gradient(90deg, rgba(43, 231, 224, 0.16), rgba(255, 122, 47, 0.12));
  clip-path: polygon(0 78%, 100% 4%, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
  align-items: start;
}

.page-about .about-hero__copy h1 {
  font-size: clamp(1.9rem, 5.2vw, 3rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0.6rem 0 1rem;
}

.page-about .about-hero__copy .lede {
  max-width: 46ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__panel {
  border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--ink) 0%, var(--bg) 100%);
  padding: 1.25rem 1.25rem 1rem;
  box-shadow: 6px 6px 0 0 rgba(21, 30, 48, 0.7);
}

.page-about .about-hero__panel-title {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 0.75rem;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  border-left: 2px solid var(--cyan);
  padding-left: 0.65rem;
}

.page-about .about-hero__stat .stat__value {
  font-family: var(--font-cond);
  font-size: clamp(1.6rem, 6vw, 2.1rem);
  line-height: 1;
  color: var(--text);
}

.page-about .about-hero__stat .stat__label {
  font-size: var(--fs-12);
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .about-hero__panel-foot {
  margin: 1.25rem 0 0;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
  font-size: var(--fs-12);
  color: var(--muted);
}

.page-about .about-hero__panel-foot .mono {
  color: var(--orange);
}

/* ---------- 纵向主轴 ---------- */

.page-about .about-spine {
  padding-bottom: 1rem;
}

.page-about .about-stop {
  position: relative;
  padding: 2.5rem 0;
  border-bottom: 1px solid rgba(34, 48, 74, 0.55);
}

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

.page-about .about-stop__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cyan);
  border: 1px solid rgba(43, 231, 224, 0.38);
  padding: 0.15rem 0.55rem;
  margin-bottom: 0.85rem;
}

.page-about .about-stop__title {
  font-size: clamp(1.35rem, 3.6vw, 2rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
}

.page-about .prose p {
  margin: 0 0 1rem;
  color: var(--text);
  line-height: 1.78;
  max-width: 62ch;
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-figure {
  margin: 1.75rem 0;
}

.page-about .about-figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--ink);
}

.page-about .about-figure .figure__cap {
  margin-top: 0.6rem;
  font-size: var(--fs-12);
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- 三层校验 ---------- */

.page-about .layers {
  display: grid;
  gap: 1.1rem;
  margin-top: 1.75rem;
}

.page-about .layer {
  border: 1px solid var(--line);
  background: var(--ink);
  padding: 0.95rem 1.1rem;
  box-shadow: 0 10px 0 -7px rgba(21, 30, 48, 0.95), 5px 5px 0 0 rgba(21, 30, 48, 0.6);
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-about .layer:hover,
.page-about .layer[open] {
  border-color: rgba(43, 231, 224, 0.4);
}

.page-about .layer__head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .layer__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .layer__name {
  flex: 1 1 auto;
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--text);
}

.page-about .layer__hint {
  font-size: var(--fs-12);
  color: var(--rule);
  letter-spacing: 0.04em;
}

.page-about .layer__body {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px dashed rgba(74, 107, 138, 0.45);
}

.page-about .layer__body p {
  margin: 0 0 0.7rem;
  font-size: var(--fs-14);
  color: var(--muted);
  line-height: 1.75;
}

.page-about .layer__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */

.page-about .team-bars {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.35rem;
}

.page-about .team-bar__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .team-bar__name {
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--text);
}

.page-about .team-bar__num {
  font-size: var(--fs-14);
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .team-bar__track {
  height: 10px;
  margin: 0.5rem 0 0.6rem;
  background: rgba(21, 30, 48, 0.95);
  border-left: 2px solid var(--rule);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  transition: width var(--t-mid) var(--ease);
}

.page-about .team-bar__fill--a {
  width: 38%;
  background: linear-gradient(90deg, var(--cyan), rgba(43, 231, 224, 0.35));
}

.page-about .team-bar__fill--b {
  width: 47%;
  background: linear-gradient(90deg, var(--cyan-soft), rgba(140, 245, 239, 0.3));
}

.page-about .team-bar__fill--c {
  width: 28%;
  background: linear-gradient(90deg, var(--rule), rgba(74, 107, 138, 0.3));
}

.page-about .team-bar__fill--d {
  width: 100%;
  background: linear-gradient(90deg, var(--orange), rgba(199, 79, 19, 0.35));
}

.page-about .team-bar__desc {
  margin: 0;
  font-size: var(--fs-14);
  color: var(--muted);
  line-height: 1.7;
  max-width: 58ch;
}

.page-about .team-bar:hover .team-bar__desc {
  color: var(--text);
}

/* ---------- 版本 ---------- */

.page-about .versions {
  display: grid;
  gap: 2rem;
  margin-top: 1.25rem;
}

.page-about .versions__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.35rem;
}

.page-about .version {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.page-about .version__bar {
  display: block;
  width: 100%;
  border: 1px solid rgba(43, 231, 224, 0.35);
  background: linear-gradient(180deg, var(--cyan), rgba(43, 231, 224, 0.06));
}

.page-about .version__bar--1 {
  height: 26px;
}

.page-about .version__bar--2 {
  height: 40px;
}

.page-about .version__bar--3 {
  height: 58px;
}

.page-about .version__bar--4 {
  height: 78px;
  background: linear-gradient(180deg, var(--orange), rgba(199, 79, 19, 0.08));
  border-color: rgba(255, 122, 47, 0.45);
}

.page-about .version__head {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  margin: 0 0 0.35rem;
}

.page-about .version__no {
  font-size: var(--fs-17);
  letter-spacing: 0.06em;
  color: var(--text);
  font-weight: 700;
}

.page-about .version__when {
  font-size: var(--fs-12);
  color: var(--muted);
  letter-spacing: 0.08em;
}

.page-about .version__text {
  margin: 0;
  font-size: var(--fs-14);
  color: var(--muted);
  line-height: 1.75;
  max-width: 52ch;
}

.page-about .version:hover .version__text {
  color: var(--text);
}

/* ---------- 生态 ---------- */

.page-about .chips {
  margin: 1.5rem 0 1.25rem;
}

.page-about .tagwall {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .tagwall__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  background: rgba(11, 18, 32, 0.7);
}

.page-about .tagwall__item .tag {
  flex: 0 0 auto;
}

.page-about .tagwall__txt {
  font-size: var(--fs-14);
  color: var(--muted);
  line-height: 1.6;
}

.page-about .about-more {
  margin: 1.5rem 0 0;
  font-size: var(--fs-14);
  color: var(--muted);
  line-height: 1.8;
  max-width: 62ch;
}

.page-about .about-more a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-more a:hover {
  color: var(--cyan-soft);
}

/* ---------- 联络 ---------- */

.page-about .contact-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.75rem;
}

.page-about .contact-card {
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  background: var(--ink);
  padding: 1.15rem 1.15rem 1.25rem;
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .contact-card:hover {
  transform: translateY(-2px);
  border-color: rgba(43, 231, 224, 0.4);
  border-top-color: var(--orange);
}

.page-about .contact-card__label {
  margin: 0 0 0.6rem;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .contact-card__value {
  margin: 0 0 0.6rem;
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--text);
  line-height: 1.5;
  word-break: break-word;
}

.page-about .contact-card__desc {
  margin: 0;
  font-size: var(--fs-14);
  color: var(--muted);
  line-height: 1.7;
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin: 1rem 0 3rem;
  padding: 1.5rem 1.35rem;
  border: 1px solid var(--line);
  background: linear-gradient(120deg, rgba(43, 231, 224, 0.09), rgba(255, 122, 47, 0.08));
  clip-path: polygon(0 0, 100% 0, 100% 100%, 2.5% 100%);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .tagwall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 3rem 0 4rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 3rem;
  }

  .page-about .about-stop {
    padding: 3.25rem 0 3.25rem 140px;
  }

  .page-about .about-stop__year {
    position: absolute;
    left: 0;
    top: 3.6rem;
    width: 96px;
    text-align: right;
    border: 0;
    padding: 0;
    margin: 0;
    font-size: var(--fs-14);
  }

  .page-about .about-stop::before {
    content: "";
    position: absolute;
    left: 114px;
    top: 3.85rem;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, var(--rule), rgba(74, 107, 138, 0));
    opacity: 0.5;
  }

  .page-about .about-stop::after {
    content: "";
    position: absolute;
    left: 111px;
    top: 4.05rem;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 0 4px rgba(43, 231, 224, 0.14);
  }

  .page-about .about-stop:last-child::before {
    bottom: 62%;
  }

  .page-about .versions {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-figure {
    margin: 2rem 0;
  }
}

@media (min-width: 1000px) {
  .page-about .contact-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .team-bar__fill,
  .page-about .contact-card,
  .page-about .layer {
    transition: none;
  }

  .page-about .contact-card:hover {
    transform: none;
  }
}