.page-about {
  --about-edge: rgba(242, 163, 58, 0.26);
  --about-soft: rgba(246, 233, 210, 0.08);
  --about-hair: rgba(246, 233, 210, 0.12);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--header-h) + clamp(20px, 5vw, 56px));
  padding-bottom: clamp(40px, 7vw, 96px);
  background:
    radial-gradient(120% 90% at 84% -12%, rgba(139, 92, 246, 0.16), transparent 62%),
    radial-gradient(90% 70% at 2% 6%, rgba(14, 127, 122, 0.18), transparent 60%);
}

.page-about .about-hero::after {
  content: "V2.0";
  position: absolute;
  right: -0.08em;
  bottom: -0.22em;
  font-family: var(--font-mono);
  font-size: clamp(110px, 24vw, 340px);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(242, 163, 58, 0.13);
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero .breadcrumbs {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-frame {
  position: relative;
  z-index: 1;
  border: 1px solid var(--about-edge);
  padding: clamp(22px, 4vw, 56px);
  background: linear-gradient(155deg, rgba(28, 28, 40, 0.92) 0%, rgba(11, 11, 15, 0.58) 55%, rgba(11, 11, 15, 0.88) 100%);
}

.page-about .about-frame::before,
.page-about .about-frame::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border: 1px solid var(--amber-500);
  pointer-events: none;
}

.page-about .about-frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-frame::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-frame-ticks {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--about-edge) 0 1px, transparent 1px 20px);
  pointer-events: none;
}

.page-about .about-kicker {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: var(--fs-12);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .about-kicker .mono-num {
  color: var(--amber-300);
  letter-spacing: 0.16em;
}

.page-about .about-title {
  margin: 0;
  font-size: clamp(30px, 5.2vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 700;
  max-width: 16em;
  color: var(--cream-100);
}

.page-about .about-lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 44em;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-facts li {
  background: rgba(11, 11, 15, 0.78);
  padding: 14px 14px 16px;
  font-size: var(--fs-14);
  color: var(--text-dim);
  line-height: 1.4;
}

.page-about .about-facts .mono-num {
  display: block;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  color: var(--amber-300);
  margin-bottom: 6px;
}

/* ---------- 通用行与刻度栏 ---------- */
.page-about .about-section {
  padding-block: clamp(56px, 8vw, 112px);
}

.page-about .about-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  align-items: start;
}

.page-about .about-gauge {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-left: 2px solid var(--amber-500);
  padding-left: 14px;
}

.page-about .about-gauge-num {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--amber-500);
}

.page-about .about-gauge-label {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--text-faint);
}

.page-about .about-h2 {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  font-weight: 700;
  color: var(--cream-100);
}

.page-about .about-subhead {
  margin: 0 0 14px;
  font-size: var(--fs-14);
  letter-spacing: 0.16em;
  color: var(--cyan-400);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-origin-media {
  margin: 0;
  border: 1px solid var(--about-edge);
}

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

.page-about .about-origin-media .media__caption {
  padding: 10px 14px;
  font-size: var(--fs-12);
  color: var(--text-faint);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-origin-copy p {
  margin: 0 0 1em;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 40em;
}

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

/* ---------- 栏目体系 ---------- */
.page-about .about-columns {
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 22%, var(--ink-800) 78%, var(--ink-900) 100%);
}

.page-about .about-tree-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-tree {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-branch {
  border: 1px solid var(--about-hair);
  border-left: 2px solid var(--amber-500);
  background: var(--ink-700);
  padding: 16px 18px 18px;
  transition: border-color var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
}

.page-about .about-branch:hover {
  border-color: var(--cyan-400);
  border-left-color: var(--cyan-400);
  transform: translateX(3px);
}

.page-about .about-branch-label {
  margin: 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  font-size: var(--fs-19);
  font-weight: 700;
  color: var(--cream-100);
}

.page-about .about-branch-count {
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--amber-500);
}

.page-about .about-branch-desc {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  line-height: 1.65;
  color: var(--text-dim);
}

.page-about .about-leaves {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-leaves li {
  border: 1px solid var(--about-edge);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: var(--fs-12);
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

.page-about .about-tree-media {
  margin: 0;
  border: 1px solid var(--about-hair);
}

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

.page-about .about-tree-media .media__caption {
  padding: 10px 14px;
  font-size: var(--fs-12);
  color: var(--text-faint);
  border-top: 1px solid var(--about-hair);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  margin-top: clamp(20px, 3vw, 32px);
  padding-left: 28px;
  border-left: 1px solid var(--about-edge);
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--amber-500);
  background: var(--ink-900);
}

.page-about .about-node[open]::before {
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(49, 224, 214, 0.14);
}

.page-about .about-node summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  min-height: 48px;
}

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

.page-about .about-node summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

.page-about .about-node-ver {
  font-size: var(--fs-14);
  letter-spacing: 0.16em;
  color: var(--amber-500);
}

.page-about .about-node-title {
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--cream-100);
}

.page-about .about-node-body {
  padding: 0 0 20px;
}

.page-about .about-node-body p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 40em;
}

/* ---------- 内容团队 ---------- */
.page-about .about-team {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -160px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(49, 224, 214, 0.16), transparent 68%);
  pointer-events: none;
}

.page-about .about-team-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-team-media {
  margin: 0;
  border: 1px solid var(--about-hair);
}

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

.page-about .about-team-media .media__caption {
  padding: 10px 14px;
  font-size: var(--fs-12);
  color: var(--text-faint);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-dims {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  counter-reset: none;
}

.page-about .about-dims li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--text-dim);
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--about-hair);
}

.page-about .about-dims li .mono-num {
  color: var(--cyan-400);
  letter-spacing: 0.08em;
}

.page-about .about-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan-700);
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 礼包与服务承诺 ---------- */
.page-about .about-promise {
  background:
    radial-gradient(70% 80% at 90% 0%, rgba(242, 163, 58, 0.16), transparent 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  border-top: 1px solid var(--about-edge);
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-promise-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 3vw, 34px);
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-promise-card {
  background: rgba(11, 11, 15, 0.82);
  padding: 20px 18px 22px;
}

.page-about .about-promise-num {
  margin: 0 0 10px;
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--amber-500);
}

.page-about .about-promise-title {
  margin: 0 0 8px;
  font-size: var(--fs-19);
  font-weight: 700;
  color: var(--cream-100);
}

.page-about .about-promise-text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 24px);
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-partner {
  padding: 20px 18px;
  border: 1px solid var(--about-edge);
  background: rgba(28, 28, 40, 0.6);
}

.page-about .about-partner-num {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  letter-spacing: 0.04em;
  color: transparent;
  -webkit-text-stroke: 1px var(--amber-300);
}

.page-about .about-partner-name {
  margin: 10px 0 8px;
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--cream-100);
}

.page-about .about-partner-text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-closing {
  margin: clamp(24px, 3vw, 34px) 0 0;
  max-width: 44em;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--text-dim);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--about-hair);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-bottom: clamp(64px, 9vw, 128px);
}

.page-about .about-next-list {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-next-list a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px 20px;
  background: var(--ink-800);
  text-decoration: none;
  color: inherit;
  min-height: 48px;
  transition: background var(--dur) var(--ease-out);
}

.page-about .about-next-list a:hover,
.page-about .about-next-list a:focus-visible {
  background: var(--ink-700);
}

.page-about .about-next-list a:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -2px;
}

.page-about .about-next-name {
  font-size: var(--fs-19);
  font-weight: 700;
  color: var(--amber-300);
}

.page-about .about-next-desc {
  font-size: var(--fs-14);
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 960px) {
  .page-about .about-row {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
  }

  .page-about .about-gauge {
    position: sticky;
    top: calc(var(--header-h) + 40px);
    display: block;
    border-left: 0;
    padding: 4px 0 4px 26px;
    background-image: repeating-linear-gradient(180deg, var(--about-edge) 0 1px, transparent 1px 15px);
    background-size: 10px 100%;
    background-repeat: no-repeat;
    background-position: left top;
  }

  .page-about .about-gauge-label {
    margin-top: 10px;
    display: block;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-tree-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-node summary {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

@media (min-width: 1180px) {
  .page-about .about-promise-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-next-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-branch {
    transition: none;
  }

  .page-about .about-branch:hover {
    transform: none;
  }
}