.page-about {
  --about-rail: 208px;
  --about-node: 56px;
  --about-node-gap: 24px;
  background: var(--ink);
  color: var(--warm);
}

/* ================= HERO ================= */
.page-about .about-hero {
  position: relative;
  padding: clamp(92px, 13vw, 148px) 0 clamp(56px, 8vw, 92px);
  background:
    radial-gradient(112% 82% at 92% 2%, rgba(49, 224, 208, 0.14), transparent 60%),
    radial-gradient(82% 64% at 2% 6%, rgba(255, 106, 43, 0.12), transparent 58%),
    var(--ink);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(111, 139, 163, 0.5), transparent);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--line);
}

.page-about .breadcrumb a {
  color: var(--line);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 60px);
  margin-top: clamp(26px, 4vw, 40px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  color: var(--paper);
  font-size: clamp(36px, 7.2vw, 76px);
  line-height: 1.05;
  letter-spacing: -0.025em;
}

.page-about .about-hero__lede {
  margin: 26px 0 0;
  max-width: 58ch;
  font-size: clamp(16.5px, 1.55vw, 18.5px);
  line-height: 1.88;
  color: var(--warm);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid rgba(111, 139, 163, 0.36);
  border-radius: 999px;
  background: rgba(7, 19, 32, 0.62);
  font-size: 13px;
  line-height: 1.4;
  color: var(--warm);
}

.page-about .about-hero__facts .mono {
  color: var(--cyan);
  font-size: 13px;
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid rgba(111, 139, 163, 0.3);
  background: var(--ink-deep);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1000 / 760;
  object-fit: cover;
}

.page-about .media__caption {
  display: block;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--line);
  background: rgba(7, 19, 32, 0.85);
  border-top: 1px solid rgba(111, 139, 163, 0.22);
}

/* ================= 通用章节头 ================= */
.page-about .about-sec-head {
  max-width: 62ch;
}

.page-about .about-sec-head__note {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.82;
  color: var(--line);
}

/* ================= 阶段线 ================= */
.page-about .about-road {
  padding: clamp(64px, 9vw, 108px) 0 clamp(48px, 7vw, 84px);
  background: var(--ink);
}

.page-about .about-road__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(36px, 5vw, 58px);
}

@media (min-width: 980px) {
  .page-about .about-road__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--line);
}

.page-about .about-rail__nav {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-bottom: 6px;
}

@media (min-width: 980px) {
  .page-about .about-rail {
    position: sticky;
    top: 126px;
  }
  .page-about .about-rail__nav {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid rgba(111, 139, 163, 0.26);
  }
}

.page-about .about-rail__nav a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 14px;
  border-left: 2px solid transparent;
  color: var(--line);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

@media (min-width: 980px) {
  .page-about .about-rail__nav a {
    margin-left: -1px;
    white-space: normal;
  }
}

.page-about .about-rail__nav a .mono {
  font-size: 12px;
  color: rgba(201, 195, 182, 0.6);
}

.page-about .about-rail__nav a:hover {
  color: var(--paper);
  background: rgba(111, 139, 163, 0.08);
}

.page-about .about-rail__nav a.is-active {
  color: var(--cyan);
  border-left-color: var(--signal);
  background: rgba(49, 224, 208, 0.07);
}

.page-about .about-rail__nav a.is-active .mono {
  color: var(--signal);
}

/* 阶段卡片 */
.page-about .about-stages {
  position: relative;
  padding-left: calc(var(--about-node) + var(--about-node-gap));
}

.page-about .about-stages::before {
  content: "";
  position: absolute;
  left: calc(var(--about-node) / 2);
  top: 16px;
  bottom: 72px;
  width: 0;
  border-left: 2px dashed rgba(49, 224, 208, 0.3);
}

.page-about .about-stage {
  position: relative;
  margin: 0 0 clamp(52px, 7vw, 96px);
}

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

.page-about .about-stage:last-child .about-stage__body {
  margin-bottom: 0;
}

.page-about .about-stage__node {
  position: absolute;
  left: calc(-1 * (var(--about-node) + var(--about-node-gap)));
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--about-node);
  height: var(--about-node);
  border-radius: 50%;
  background: var(--ink-deep);
  border: 2px solid var(--signal);
  color: var(--signal);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 0 0 6px var(--ink);
}

.page-about .about-stage__body {
  max-width: 660px;
  padding: clamp(20px, 3.2vw, 34px);
  border-radius: var(--r-lg);
  border: 1px solid rgba(111, 139, 163, 0.26);
  background: linear-gradient(160deg, rgba(62, 110, 142, 0.14), rgba(7, 19, 32, 0.72) 62%);
}

.page-about .about-stage__title {
  margin: 0 0 12px;
  color: var(--paper);
  font-size: clamp(19px, 2.3vw, 25px);
  line-height: 1.4;
}

.page-about .about-stage__body > p {
  margin: 0;
  font-size: 16px;
  line-height: 1.86;
  color: var(--warm);
}

.page-about .about-stage__points {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .about-stage__points li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(201, 195, 182, 0.92);
}

.page-about .about-stage__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 9px;
  height: 2px;
  background: var(--cyan);
}

@media (min-width: 900px) {
  .page-about .about-stage:nth-child(odd) .about-stage__body {
    max-width: 620px;
  }
  .page-about .about-stage:nth-child(even) .about-stage__body {
    margin-left: 60px;
    max-width: 700px;
    border-color: rgba(49, 224, 208, 0.28);
  }
}

/* ================= 团队分工 ================= */
.page-about .about-team {
  padding: clamp(64px, 9vw, 108px) 0;
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
  border-top: 1px solid rgba(111, 139, 163, 0.2);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
  margin-top: clamp(32px, 4vw, 52px);
}

@media (min-width: 760px) {
  .page-about .about-team__grid {
    grid-template-columns: 1fr 0.86fr 1.32fr;
    align-items: start;
  }
}

.page-about .about-role {
  position: relative;
  padding: clamp(22px, 3vw, 30px);
  border-radius: var(--r-lg);
  border: 1px solid rgba(111, 139, 163, 0.28);
  background: rgba(7, 19, 32, 0.72);
  transition: border-color 220ms var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-color: rgba(49, 224, 208, 0.52);
}

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

.page-about .about-role__ring {
  position: relative;
  display: grid;
  place-items: center;
  width: 88px;
  height: 88px;
  margin-bottom: 18px;
  border-radius: 50%;
}

.page-about .about-role__ring::after {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 50%;
  background: var(--ink-deep);
}

.page-about .about-role__ring span {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 21px;
  color: var(--paper);
}

.page-about .about-role--edit .about-role__ring {
  background: conic-gradient(var(--signal) 0 27.8%, rgba(111, 139, 163, 0.2) 27.8% 100%);
}

.page-about .about-role--ticket .about-role__ring {
  background: conic-gradient(var(--cyan) 0 16.7%, rgba(111, 139, 163, 0.2) 16.7% 100%);
}

.page-about .about-role--test .about-role__ring {
  background: conic-gradient(var(--mist) 0 55.6%, rgba(111, 139, 163, 0.2) 55.6% 100%);
}

.page-about .about-role__name {
  margin: 0 0 10px;
  color: var(--paper);
  font-size: 18px;
  line-height: 1.4;
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--warm);
}

.page-about .about-role__duty {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(111, 139, 163, 0.4);
  font-size: 14px;
  line-height: 1.76;
  color: var(--cyan);
  max-height: 200px;
  overflow: hidden;
  transition: max-height 300ms var(--ease), opacity 300ms var(--ease),
    padding-top 300ms var(--ease), margin-top 300ms var(--ease);
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .about-role__duty {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
  }
  .page-about .about-role:hover .about-role__duty,
  .page-about .about-role:focus-within .about-role__duty {
    max-height: 200px;
    opacity: 1;
    margin-top: 14px;
    padding-top: 12px;
    border-top-color: rgba(111, 139, 163, 0.4);
  }
}

/* ================= 整理标准 ================= */
.page-about .about-standard {
  padding: clamp(64px, 9vw, 108px) 0;
  background: var(--ink);
}

.page-about .about-standard__grid {
  display: grid;
  gap: clamp(30px, 4vw, 54px);
  margin-top: clamp(32px, 4vw, 48px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-standard__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }
}

.page-about .about-standard__media {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid rgba(111, 139, 163, 0.3);
  background: var(--ink-deep);
}

.page-about .about-standard__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 700;
  object-fit: cover;
}

.page-about .about-standard__body .lede {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.86;
  color: var(--warm);
}

.page-about .about-flow {
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px dashed rgba(111, 139, 163, 0.3);
}

.page-about .about-flow li:first-child {
  padding-top: 0;
}

.page-about .about-flow li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-flow__n {
  padding-top: 4px;
  font-size: 15px;
  color: var(--signal);
  letter-spacing: 0.06em;
}

.page-about .about-flow__t {
  margin: 0 0 6px;
  color: var(--paper);
  font-size: 16.5px;
  line-height: 1.5;
}

.page-about .about-flow p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--warm);
}

/* ================= 更新与复核 ================= */
.page-about .about-cadence {
  padding: clamp(64px, 9vw, 108px) 0;
  background:
    radial-gradient(90% 70% at 8% 100%, rgba(242, 181, 68, 0.1), transparent 62%),
    var(--ink-deep);
}

.page-about .about-cadence__grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
  margin-top: clamp(32px, 4vw, 52px);
}

@media (min-width: 820px) {
  .page-about .about-cadence__grid {
    grid-template-columns: repeat(12, 1fr);
    align-items: start;
  }
  .page-about .about-cad:nth-child(1) {
    grid-column: 1 / span 5;
  }
  .page-about .about-cad:nth-child(2) {
    grid-column: 7 / span 6;
    margin-top: 54px;
  }
  .page-about .about-cad:nth-child(3) {
    grid-column: 3 / span 8;
    margin-top: 18px;
  }
}

.page-about .about-cad {
  padding: clamp(22px, 3vw, 30px);
  border-radius: var(--r-md);
  border: 1px solid rgba(111, 139, 163, 0.26);
  background: rgba(11, 27, 43, 0.72);
}

.page-about .about-cad--a {
  border-left: 3px solid var(--signal);
}

.page-about .about-cad--b {
  border-left: 3px solid var(--cyan);
}

.page-about .about-cad--c {
  border-left: 3px solid var(--amber);
}

.page-about .about-cad__k {
  margin: 0 0 10px;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--line);
}

.page-about .about-cad__t {
  margin: 0 0 10px;
  color: var(--paper);
  font-size: 18px;
  line-height: 1.45;
}

.page-about .about-cad p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--warm);
}

/* ================= 地域与备案铭牌 ================= */
.page-about .about-plate {
  padding: clamp(64px, 9vw, 108px) 0 clamp(56px, 8vw, 96px);
  background: var(--ink);
}

.page-about .about-plate__media {
  margin: 0 0 clamp(-90px, -8vw, -60px);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid rgba(111, 139, 163, 0.3);
  background: var(--ink-deep);
}

.page-about .about-plate__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1400 / 600;
  object-fit: cover;
}

.page-about .about-plate__board {
  position: relative;
  max-width: 620px;
  margin: 0 auto;
  padding: clamp(26px, 4vw, 40px);
  border-radius: var(--r-md);
  border: 1px solid rgba(49, 224, 208, 0.34);
  background: linear-gradient(150deg, rgba(7, 19, 32, 0.98), rgba(11, 27, 43, 0.94));
  box-shadow: 0 0 0 1px rgba(7, 19, 32, 0.9), 0 24px 60px rgba(0, 0, 0, 0.5);
}

.page-about .about-plate__board::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px dashed rgba(111, 139, 163, 0.32);
  border-radius: calc(var(--r-md) - 6px);
  pointer-events: none;
}

.page-about .about-plate__label {
  position: relative;
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-plate__region {
  position: relative;
  margin: 0 0 22px;
  color: var(--paper);
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about .about-plate__rows {
  position: relative;
  margin: 0 0 22px;
  display: grid;
  gap: 14px;
}

.page-about .about-plate__rows > div {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px dashed rgba(111, 139, 163, 0.28);
}

.page-about .about-plate__rows > div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-plate__rows dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--line);
}

.page-about .about-plate__rows dd {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-plate__rows dd.mono {
  color: var(--signal);
  font-size: 16px;
  letter-spacing: 0.02em;
}

.page-about .about-plate__note {
  position: relative;
  margin: 0 0 22px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--warm);
}

.page-about .about-plate__board .btn {
  position: relative;
}

/* ================= 下一步卷轴 ================= */
.page-about .about-next {
  padding: 0 0 clamp(64px, 9vw, 108px);
  background: var(--ink);
}

.page-about .about-next__rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(258px, 78%);
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 14px;
}

@media (min-width: 760px) {
  .page-about .about-next__rail {
    grid-auto-columns: minmax(272px, 1fr);
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-flow: row;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-about .about-next__item {
  scroll-snap-align: start;
  display: grid;
  gap: 8px;
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--r-md);
  border: 1px solid rgba(111, 139, 163, 0.3);
  background: rgba(7, 19, 32, 0.66);
  text-decoration: none;
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .about-next__item:hover {
  border-color: rgba(255, 106, 43, 0.68);
  background: rgba(11, 27, 43, 0.9);
}

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

.page-about .about-next__n {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--signal);
}

.page-about .about-next__t {
  font-size: 17px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-next__d {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--line);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role__duty,
  .page-about .about-next__item,
  .page-about .about-rail__nav a,
  .page-about .breadcrumb a {
    transition: none;
  }
}