.page-about {
  --about-pad: clamp(46px, 6.5vw, 90px);
  --about-card-bg: linear-gradient(180deg, rgba(26, 16, 48, .88), rgba(11, 6, 22, .72));
  color: var(--ink);
  padding-bottom: var(--about-pad);
}

.page-about [id] {
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-top: 18px;
}

.page-about .breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: rgba(167, 156, 196, .55);
}

.page-about .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  text-decoration: underline;
}

/* ---------- 框景首屏 ---------- */
.page-about .about-hero__frame {
  padding: clamp(28px, 5vw, 60px) clamp(20px, 4.5vw, 62px) clamp(26px, 4vw, 48px);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(255, 61, 190, .16), transparent 58%),
    radial-gradient(90% 120% at 0% 100%, rgba(43, 245, 224, .12), transparent 60%),
    linear-gradient(160deg, rgba(26, 16, 48, .94), rgba(11, 6, 22, .88));
  border: 1px solid var(--line);
}

.page-about h1 {
  margin: .5em 0 .45em;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 6.2vw, 4.1rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--ink);
  text-shadow: 0 0 22px rgba(43, 245, 224, .30);
}

.page-about .about-hero__lead {
  max-width: 46em;
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.page-about .stat-num {
  font-size: clamp(1.5rem, 3.2vw, 2.05rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--yellow);
}

.page-about .stat-label {
  font-size: .8rem;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 通用区块 ---------- */
.page-about .about-band {
  padding: var(--about-pad) 0 0;
}

.page-about .about-band--jade {
  margin-top: var(--about-pad);
  padding: clamp(40px, 6vw, 76px) 0;
  background: linear-gradient(180deg, rgba(14, 59, 58, .78) 0%, rgba(11, 6, 22, .94) 82%);
}

.page-about .about-band--wine {
  margin-top: var(--about-pad);
  padding: clamp(40px, 6vw, 76px) 0;
  background: linear-gradient(180deg, rgba(58, 14, 36, .78) 0%, rgba(11, 6, 22, .94) 82%);
}

.page-about .about-band--jade + .about-band,
.page-about .about-band--wine + .about-band {
  padding-top: clamp(40px, 6vw, 76px);
}

.page-about .about-band--index {
  margin-top: var(--about-pad);
  padding: clamp(40px, 6vw, 76px) 0 var(--about-pad);
  background: linear-gradient(180deg, rgba(26, 16, 48, .55) 0%, rgba(11, 6, 22, .95) 90%);
}

.page-about .about-head {
  max-width: 800px;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about h2 {
  margin: .35em 0 .55em;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.55rem, 3.6vw, 2.65rem);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about h3 {
  margin: 0 0 .5em;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink);
}

.page-about .about-head__intro,
.page-about .split-lead {
  max-width: 44em;
  margin: 0;
  font-size: .98rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 三卡 ---------- */
.page-about .tri-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .tri-card {
  padding: 26px 22px 24px;
  background: var(--about-card-bg);
  border: 1px solid var(--line-soft);
  border-top-width: 2px;
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .tri-card--cyan {
  border-top-color: var(--cyan);
}

.page-about .tri-card--magenta {
  border-top-color: var(--magenta);
}

.page-about .tri-card--yellow {
  border-top-color: var(--yellow);
}

.page-about .tri-card:hover {
  transform: translateY(-3px);
}

.page-about .tri-card--cyan:hover {
  border-color: var(--cyan);
}

.page-about .tri-card--magenta:hover {
  border-color: var(--magenta);
}

.page-about .tri-card--yellow:hover {
  border-color: var(--yellow);
}

.page-about .tri-card p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 左窄右宽版式 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .split-index {
  margin: 0 0 8px;
  font-size: 1.35rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .split-note {
  max-width: 22em;
  margin: 0;
  font-size: .84rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队分工 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 26px;
}

.page-about .team-matrix {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-cell {
  padding: 16px 18px;
  background: rgba(11, 6, 22, .5);
  border: 1px solid var(--line-soft);
  border-left-width: 2px;
}

.page-about .team-cell--edit {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(43, 245, 224, .10), rgba(11, 6, 22, .5) 64%);
}

.page-about .team-cell--art {
  border-left-color: var(--magenta);
  background: linear-gradient(90deg, rgba(255, 61, 190, .10), rgba(11, 6, 22, .5) 64%);
}

.page-about .team-cell--proof {
  border-left-color: var(--yellow);
  background: linear-gradient(90deg, rgba(255, 226, 74, .09), rgba(11, 6, 22, .5) 64%);
}

.page-about .team-cell h3 {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .team-cell h3 .mono {
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .team-cell p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure .media-frame {
  border: 1px solid var(--line-soft);
  background: rgba(11, 6, 22, .6);
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: .78rem;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-figure--wide {
  margin-bottom: clamp(30px, 4vw, 46px);
}

/* ---------- 流程 SVG ---------- */
.page-about .flow-wrap {
  margin-bottom: clamp(24px, 4vw, 40px);
  padding-bottom: 8px;
  overflow-x: auto;
}

.page-about .flow-svg {
  display: block;
  width: 100%;
  min-width: 660px;
  height: auto;
}

.page-about .flow-line {
  stroke: rgba(76, 123, 255, .55);
  stroke-width: 1.5;
  stroke-dasharray: 6 8;
}

.page-about .flow-svg circle {
  fill: var(--panel);
  stroke: var(--cyan);
  stroke-width: 2;
}

.page-about .flow-node--magenta circle {
  stroke: var(--magenta);
}

.page-about .flow-svg text {
  font-family: var(--font-body);
  font-size: 17px;
  fill: var(--ink);
}

.page-about .flow-svg .flow-num {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--yellow);
}

.page-about .flow-svg .flow-sub {
  font-size: 13px;
  fill: var(--muted);
}

/* ---------- 步骤折叠 ---------- */
.page-about .process-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .step-stack {
  min-width: 0;
}

.page-about .step {
  background: rgba(26, 16, 48, .55);
  border: 1px solid var(--line-soft);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .step + .step {
  margin-top: 10px;
}

.page-about .step[open] {
  border-color: var(--line);
  background: rgba(26, 16, 48, .82);
}

.page-about .step > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.page-about .step > summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.page-about .step-index {
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .step-toggle {
  margin-left: auto;
  font-size: .9rem;
  color: var(--muted);
  transition: transform .24s var(--ease), color .24s var(--ease);
}

.page-about .step[open] .step-toggle {
  transform: rotate(90deg);
  color: var(--cyan);
}

.page-about .step-body {
  padding: 0 16px 16px 44px;
}

.page-about .step-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .step-list li {
  position: relative;
  margin: 8px 0;
  padding-left: 16px;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .step-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .timeline-item {
  position: relative;
  padding-bottom: 30px;
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 14px rgba(43, 245, 224, .55);
}

.page-about .timeline-item:nth-child(2)::before {
  border-color: var(--magenta);
  box-shadow: 0 0 14px rgba(255, 61, 190, .5);
}

.page-about .timeline-item:nth-child(3)::before {
  border-color: var(--blue);
  box-shadow: 0 0 14px rgba(76, 123, 255, .5);
}

.page-about .timeline-item:nth-child(4)::before {
  border-color: var(--yellow);
  box-shadow: 0 0 14px rgba(255, 226, 74, .45);
}

.page-about .timeline-stage {
  margin: 0 0 6px;
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--yellow);
}

.page-about .timeline-item h3 {
  margin: 0 0 6px;
  font-size: 1.04rem;
}

.page-about .timeline-desc {
  max-width: 46em;
  margin: 0;
  font-size: .94rem;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .timeline-note {
  max-width: 46em;
  margin-top: 10px;
  padding: 10px 14px;
  font-size: .85rem;
  line-height: 1.75;
  color: var(--muted);
  background: rgba(26, 16, 48, .66);
  border-left: 2px solid var(--line);
}

.page-about .timeline-item:hover .timeline-note,
.page-about .timeline-item:focus-within .timeline-note {
  border-left-color: var(--cyan);
}

/* ---------- 协作伙伴 ---------- */
.page-about .partner-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .partner-list li {
  position: relative;
  padding-left: 22px;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .partner-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 10px;
  height: 1px;
  background: var(--orange);
  box-shadow: 0 0 8px rgba(255, 154, 60, .7);
}

/* ---------- 引用与坚持 ---------- */
.page-about .about-quote {
  margin: 0 0 clamp(24px, 4vw, 38px);
  padding: 18px 22px;
  background: rgba(255, 61, 190, .07);
  border-left: 1px solid var(--magenta);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1rem, 2.1vw, 1.22rem);
  line-height: 1.75;
  color: var(--ink);
}

.page-about .principle-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .principle-list li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .principle-list h3 {
  margin: 0;
}

.page-about .principle-list p {
  max-width: 46em;
  margin: 0;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-close-note {
  max-width: 52em;
  margin: clamp(24px, 4vw, 34px) 0 0;
  padding: 16px 18px;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--muted);
  background: rgba(26, 16, 48, .5);
  border: 1px solid var(--line-soft);
}

/* ---------- 索引链接组 ---------- */
.page-about .index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .index-grid li {
  display: flex;
}

.page-about .index-grid a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  padding: 18px 20px;
  background: var(--about-card-bg);
  border: 1px solid var(--line-soft);
  color: var(--ink);
  text-decoration: none;
  transition: border-color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .index-grid a:hover,
.page-about .index-grid a:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(43, 245, 224, .12);
}

.page-about .index-k {
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .index-t {
  font-size: .93rem;
  line-height: 1.7;
  color: var(--muted);
}

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

  .page-about .partner-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 26px;
  }

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

@media (min-width: 860px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
    gap: 30px;
  }

  .page-about .principle-list li {
    grid-template-columns: minmax(150px, 200px) minmax(0, 1fr);
    gap: 10px 30px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(150px, 2fr) minmax(0, 8fr);
    gap: clamp(28px, 4vw, 62px);
  }

  .page-about .process-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
    gap: 36px;
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 24px;
  }

  .page-about .timeline-note {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height .3s var(--ease), opacity .25s var(--ease), margin-top .3s var(--ease);
  }

  .page-about .timeline-item:hover .timeline-note,
  .page-about .timeline-item:focus-within .timeline-note {
    max-height: 260px;
    margin-top: 10px;
    opacity: 1;
  }
}

@media (min-width: 1180px) {
  .page-about .index-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-figure--wide {
    margin-bottom: clamp(34px, 4vw, 52px);
  }
}