.page-about {
  --about-cyan-deep: #0E8F7D;
  --about-gold-deep: #A9760A;
  --about-card: rgba(16, 42, 63, .62);
  --about-card-solid: #102A3F;
  background: var(--deep);
  color: var(--cedar);
  min-width: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-block: 1.1rem .25rem;
}
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .1em;
}
.page-about .crumbs li {
  color: var(--cool-gray);
}
.page-about .crumbs li + li::before {
  content: "/";
  margin-right: .45rem;
  color: rgba(147, 161, 174, .48);
}
.page-about .crumbs a {
  color: var(--cool-gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.page-about .crumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-about .crumbs [aria-current="page"] {
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.25rem, 4vw, 2.75rem) clamp(1.75rem, 5vw, 3rem);
}
.page-about .about-hero .eyebrow {
  display: inline-block;
  font-size: .74rem;
  letter-spacing: .22em;
  color: var(--cyan);
  border: 1px solid rgba(31, 227, 196, .38);
  border-radius: 999px;
  padding: .3rem .8rem;
  margin: 0 0 1.1rem;
}
.page-about .about-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 1.1rem + 5vw, 4rem);
  line-height: 1.14;
  letter-spacing: .02em;
  margin: 0;
  color: var(--white);
  max-width: 22ch;
}
.page-about .about-lede {
  max-width: 60ch;
  margin: 1.2rem 0 0;
  font-size: clamp(1rem, .95rem + .3vw, 1.1rem);
  line-height: 1.9;
  color: rgba(233, 238, 243, .82);
}
.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}
.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.page-about .hero-stats .stat {
  background: var(--midnight);
  padding: 1.05rem 1.1rem 1.2rem;
  min-width: 0;
  transition: background var(--t-fast);
}
.page-about .hero-stats .stat:hover {
  background: #16344d;
}
.page-about .hero-stats .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 1.15rem + 1.1vw, 2rem);
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--cyan);
}
.page-about .hero-stats .stat:nth-child(4) .stat-value {
  color: var(--gold);
}
.page-about .hero-stats .stat-label {
  display: block;
  margin-top: .5rem;
  font-size: .82rem;
  line-height: 1.6;
  color: var(--cool-gray);
}
.page-about .hero-band {
  height: 8px;
  margin-top: clamp(1.25rem, 3.5vw, 2rem);
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--mist) 34%, var(--gold-pale) 68%, var(--gold) 100%);
  opacity: .92;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2.25rem);
  padding-block: clamp(1rem, 3vw, 1.75rem) clamp(2.75rem, 7vw, 4.5rem);
}
.page-about .about-rail {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1rem 1.15rem;
  min-width: 0;
}
.page-about .rail-title {
  margin: 0 0 .85rem;
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--cool-gray);
  text-transform: uppercase;
}
.page-about .rail-nav {
  display: flex;
  flex-direction: column;
  gap: .12rem;
}
.page-about .index-link {
  display: block;
  padding: .5rem .55rem .5rem .85rem;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--cool-gray);
  text-decoration: none;
  font-size: .9rem;
  line-height: 1.55;
  transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}
.page-about .index-link:hover {
  color: var(--white);
  background: rgba(31, 227, 196, .08);
}
.page-about .index-link[aria-current="true"] {
  color: var(--white);
  border-left-color: var(--cyan);
  background: rgba(31, 227, 196, .1);
}
.page-about .btn-back {
  margin-top: 1rem;
  width: 100%;
  justify-content: center;
}

.page-about .about-body {
  display: flex;
  flex-direction: column;
  gap: clamp(1.1rem, 2.6vw, 1.8rem);
  min-width: 0;
}

/* ---------- 章节卡 ---------- */
.page-about .about-section {
  position: relative;
  overflow: hidden;
  background: var(--about-card-solid);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(1.3rem, 3vw, 2.2rem);
  min-width: 0;
}
.page-about .about-section::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: linear-gradient(90deg, var(--cyan), rgba(31, 227, 196, 0));
}
.page-about .about-section .eyebrow {
  margin: 0 0 .3rem;
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--cool-gray);
}
.page-about .about-section h2 {
  position: relative;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.3rem, 1.05rem + 1.1vw, 1.85rem);
  line-height: 1.32;
  letter-spacing: .02em;
  margin: .5rem 0 .95rem;
  color: var(--white);
}
.page-about .about-section h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: .92em;
  border-radius: 2px;
  background: var(--cyan);
  margin-right: .55rem;
  vertical-align: -.06em;
}
.page-about .about-section p {
  margin: 0 0 1em;
  line-height: 1.85;
  color: rgba(233, 238, 243, .82);
}
.page-about .about-section > p:last-child {
  margin-bottom: 0;
}

/* 浅色章节 */
.page-about .about-section--light {
  background: var(--cedar);
  border-color: rgba(10, 26, 42, .12);
}
.page-about .about-section--light::before {
  background: linear-gradient(90deg, var(--about-gold-deep), rgba(169, 118, 10, 0));
}
.page-about .about-section--light .eyebrow {
  color: rgba(27, 52, 70, .62);
}
.page-about .about-section--light h2 {
  color: var(--deep);
}
.page-about .about-section--light h2::before {
  background: var(--about-cyan-deep);
}
.page-about .about-section--light p {
  color: var(--ink-text);
}

/* ---------- 困扰卡片 ---------- */
.page-about .trouble-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .85rem;
  margin-top: 1.25rem;
}
.page-about .trouble-card {
  background: rgba(10, 26, 42, .58);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 1.05rem 1rem 1.1rem;
  transition: border-color var(--t-fast), transform var(--t-fast), background var(--t-fast);
}
.page-about .trouble-card:hover {
  border-color: rgba(31, 227, 196, .5);
  background: rgba(10, 26, 42, .8);
  transform: translateY(-3px);
}
.page-about .trouble-card .num-badge {
  display: inline-block;
  margin-bottom: .5rem;
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--cyan);
}
.page-about .trouble-card h3 {
  margin: 0 0 .5rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--white);
}
.page-about .trouble-card p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.78;
  color: var(--cool-gray);
}
.page-about .callout {
  margin: 1.3rem 0 0;
  padding: .95rem 1.05rem;
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(31, 227, 196, .07);
  font-size: .93rem;
  line-height: 1.8;
}
.page-about .callout--gold {
  border-left-color: var(--about-gold-deep);
  background: rgba(169, 118, 10, .1);
  color: var(--ink-text);
}

/* ---------- 维度分组 ---------- */
.page-about .dim-filter {
  margin-top: 1.3rem;
}
.page-about .dim-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.1rem;
}
.page-about .dim-tabs .chip[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--deep);
}
.page-about .dim-groups {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .9rem;
}
.page-about .dim-group {
  background: rgba(10, 26, 42, .5);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.05rem 1rem 1.15rem;
  min-width: 0;
  transition: border-color var(--t-fast), background var(--t-fast);
}
.page-about .dim-group:hover {
  border-color: rgba(147, 161, 174, .55);
  background: rgba(10, 26, 42, .78);
}
.page-about .dim-group::before {
  content: "";
  display: block;
  width: 46px;
  height: 4px;
  border-radius: 999px;
  margin-bottom: .85rem;
  background: var(--cyan);
}
.page-about .dim-group[data-filter-tags="module"]::before {
  background: var(--gold);
}
.page-about .dim-group[data-filter-tags="version"]::before {
  background: var(--mist);
}
.page-about .dim-group h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--white);
}
.page-about .dim-count {
  display: block;
  margin: .35rem 0 0;
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--cool-gray);
}
.page-about .dim-list {
  list-style: none;
  margin: .85rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: .42rem;
}
.page-about .dim-list li {
  position: relative;
  padding-left: 1rem;
  font-size: .88rem;
  line-height: 1.7;
  color: rgba(233, 238, 243, .78);
}
.page-about .dim-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line-strong);
}

/* ---------- 工序流程 ---------- */
.page-about .flow {
  position: relative;
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
}
.page-about .flow::before {
  content: "";
  position: absolute;
  left: 19px;
  top: .7rem;
  bottom: .7rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--about-cyan-deep), var(--about-gold-deep));
  opacity: .55;
}
.page-about .flow-item {
  position: relative;
  padding: 0 0 1.15rem 3.3rem;
  min-width: 0;
}
.page-about .flow-item:last-child {
  padding-bottom: 0;
}
.page-about .flow-node {
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(14, 143, 125, .1);
  border: 1px solid rgba(14, 143, 125, .5);
  color: var(--about-cyan-deep);
  font-size: .78rem;
  letter-spacing: .04em;
  transition: background var(--t-fast), color var(--t-fast), transform var(--t-fast);
}
.page-about .flow-item:hover .flow-node,
.page-about .flow-item:focus-within .flow-node {
  background: var(--about-cyan-deep);
  color: var(--cedar);
  transform: scale(1.05);
}
.page-about .flow-title {
  margin: 0 0 .3rem;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--deep);
}
.page-about .flow-text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--ink-text);
}
.page-about .flow-note {
  display: block;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  line-height: 1.7;
  letter-spacing: .01em;
  color: var(--about-gold-deep);
  transition: max-height var(--t-mid), opacity var(--t-mid), margin var(--t-mid);
}
.page-about .flow-item:hover .flow-note,
.page-about .flow-item:focus-within .flow-note {
  max-height: 7rem;
  opacity: 1;
  margin-top: .45rem;
}

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .9rem;
  margin-top: 1.3rem;
}
.page-about .team-card {
  background: rgba(10, 26, 42, .55);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.05rem 1rem 1.15rem;
  min-width: 0;
  outline: none;
  transition: border-color var(--t-fast), transform var(--t-fast), background var(--t-fast);
}
.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  border-color: rgba(31, 227, 196, .5);
  background: rgba(10, 26, 42, .8);
  transform: translateY(-3px);
}
.page-about .team-head {
  display: flex;
  align-items: baseline;
  gap: .65rem;
}
.page-about .team-num {
  font-size: clamp(1.4rem, 1.15rem + 1vw, 1.9rem);
  line-height: 1;
  color: var(--gold);
  letter-spacing: .01em;
}
.page-about .team-head h3 {
  margin: 0;
  font-size: .98rem;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--white);
}
.page-about .team-bar {
  height: 6px;
  margin: .8rem 0 .85rem;
  border-radius: 999px;
  background: rgba(147, 161, 174, .18);
  overflow: hidden;
}
.page-about .team-bar span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--cyan);
  transition: width var(--t-mid);
}
.page-about .team-card:nth-child(1) .team-bar span {
  width: 40%;
}
.page-about .team-card:nth-child(2) .team-bar span {
  width: 27%;
  background: var(--gold);
}
.page-about .team-card:nth-child(3) .team-bar span {
  width: 33%;
  background: var(--mist);
}
.page-about .team-card p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.78;
  color: var(--cool-gray);
}

/* ---------- 建议条件 ---------- */
.page-about .advice-list {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .75rem;
}
.page-about .advice-item {
  display: grid;
  gap: .35rem;
  padding: 1rem 1.05rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .7);
  border: 1px solid rgba(10, 26, 42, .1);
  transition: border-color var(--t-fast), background var(--t-fast);
}
.page-about .advice-item:hover {
  border-color: var(--about-cyan-deep);
  background: var(--white);
}
.page-about .advice-tag {
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--about-cyan-deep);
}
.page-about .advice-item p {
  margin: 0;
  font-size: .91rem;
  line-height: 1.8;
  color: var(--ink-text);
}

/* ---------- 下一步 ---------- */
.page-about .about-section--next {
  background: linear-gradient(158deg, var(--midnight) 0%, var(--deep) 78%);
}
.page-about .next-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .8rem;
  margin-top: 1.3rem;
}
.page-about .next-card {
  display: block;
  padding: 1.05rem 1rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(10, 26, 42, .5);
  text-decoration: none;
  transition: border-color var(--t-fast), background var(--t-fast), transform var(--t-fast);
}
.page-about .next-card:hover {
  border-color: var(--cyan);
  background: rgba(31, 227, 196, .08);
  transform: translateY(-3px);
}
.page-about .next-num {
  display: block;
  margin-bottom: .5rem;
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--cyan);
}
.page-about .next-card h3 {
  margin: 0 0 .4rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--white);
}
.page-about .next-card p {
  margin: 0;
  font-size: .87rem;
  line-height: 1.75;
  color: var(--cool-gray);
}

/* ---------- 图片容器 ---------- */
.page-about .figure {
  margin: 1.4rem 0 0;
}
.page-about .figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: cover;
}
.page-about .figure-cap {
  margin-top: .65rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--cool-gray);
}
.page-about .about-section--light .figure-cap {
  color: rgba(27, 52, 70, .68);
}

/* ---------- 响应式 ---------- */
@media (hover: none) {
  .page-about .flow-note {
    max-height: 7rem;
    opacity: 1;
    margin-top: .45rem;
  }
}

@media (min-width: 640px) {
  .page-about .trouble-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .advice-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .trouble-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .flow::before {
    left: 23px;
  }
  .page-about .flow-item {
    padding-left: 4rem;
  }
  .page-about .flow-node {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    font-size: .84rem;
  }
}

@media (min-width: 900px) {
  .page-about .dim-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-shell {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 5.5rem;
  }
  .page-about .about-section {
    padding-inline: clamp(1.6rem, 2.6vw, 2.6rem);
  }
}

@media (min-width: 1080px) {
  .page-about .about-section:nth-of-type(even) {
    margin-right: -1.25rem;
  }
  .page-about .about-section:nth-of-type(odd) {
    margin-left: -1.25rem;
  }
}