.page-about {
  --vtl-col: 76px;
  --vtl-axis: 38px;
  display: block;
  color: var(--mist-050);
  font-family: var(--font-body);
  overflow-x: clip;
}

@media (min-width: 720px) {
  .page-about {
    --vtl-col: 104px;
    --vtl-axis: 59px;
  }
}

/* ---------- 面包屑 ---------- */
.page-about .arch-crumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: clamp(14px, 3vw, 26px);
  margin-bottom: clamp(18px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.page-about .arch-crumb a {
  color: var(--slate-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .arch-crumb a:hover,
.page-about .arch-crumb a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .arch-crumb__sep {
  color: rgba(138, 163, 156, .5);
}

.page-about .arch-crumb [aria-current="page"] {
  color: var(--mist-050);
}

/* ---------- 首屏档案头 ---------- */
.page-about .arch-hero {
  position: relative;
  padding: 0 0 clamp(28px, 5vw, 50px) clamp(14px, 2.6vw, 26px);
}

.page-about .arch-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: clamp(28px, 5vw, 50px);
  width: 2px;
  background: linear-gradient(180deg, var(--turf-400) 0%, rgba(61, 240, 138, .28) 48%, rgba(61, 240, 138, 0) 100%);
}

.page-about .arch-hero__file {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: clamp(14px, 2.4vw, 22px);
}

.page-about .arch-hero__no,
.page-about .arch-hero__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  padding: 4px 9px;
  border: 1px solid var(--line);
  color: var(--slate-500);
}

.page-about .arch-hero__no {
  color: var(--turf-400);
  border-color: rgba(61, 240, 138, .45);
}

.page-about .arch-hero__title {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 8.4vw, 5rem);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--mist-050);
  max-width: 15ch;
}

.page-about .arch-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.78;
  color: rgba(233, 243, 239, .78);
}

.page-about .arch-hero__facts {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  border-top: 1px dashed var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 24px);
}

@media (min-width: 720px) {
  .page-about .arch-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .arch-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .arch-hero__fact-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  letter-spacing: .02em;
  line-height: 1;
  color: var(--turf-400);
}

.page-about .arch-hero__fact-label {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate-500);
}

/* ---------- 宽幅图带 ---------- */
.page-about .arch-band {
  position: relative;
  margin: clamp(26px, 4.5vw, 52px) 0;
  border: 1px solid var(--line);
  background: var(--panel-800);
  overflow: hidden;
}

.page-about .arch-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(.85) brightness(.82);
}

.page-about .arch-band__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(138, 163, 156, .14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(138, 163, 156, .14) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), rgba(0, 0, 0, 0) 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), rgba(0, 0, 0, 0) 78%);
}

.page-about .arch-band__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist-050);
  background: rgba(5, 16, 14, .88);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

/* ---------- 章节通用 ---------- */
.page-about .arch-sec {
  padding: clamp(30px, 5.5vw, 64px) 0;
  border-top: 1px solid var(--line);
}

.page-about .arch-sec__head {
  margin-bottom: clamp(20px, 3.4vw, 34px);
  max-width: 64ch;
}

.page-about .arch-sec__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--turf-400);
}

.page-about .arch-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.4vw, 2.7rem);
  line-height: 1.1;
  letter-spacing: -.015em;
  color: var(--mist-050);
}

.page-about .arch-sec__note {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--slate-500);
}

/* ---------- 由来 ---------- */
.page-about .arch-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.6vw, 40px);
}

.page-about .arch-origin__main p {
  margin: 0 0 16px;
  max-width: 46ch;
  line-height: 1.78;
  color: rgba(233, 243, 239, .8);
}

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

.page-about .arch-origin__main .arch-lede {
  max-width: 42ch;
  font-size: clamp(1.02rem, 1.5vw, 1.16rem);
  line-height: 1.72;
  color: var(--mist-050);
}

.page-about .arch-note {
  position: relative;
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--panel-800);
  border: 1px solid var(--line);
  border-left: 3px solid var(--slate-500);
}

.page-about .arch-note::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 40%;
  height: 40%;
  border-right: 1px solid rgba(61, 240, 138, .35);
  border-bottom: 1px solid rgba(61, 240, 138, .35);
  pointer-events: none;
}

.page-about .arch-note__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--turf-400);
}

.page-about .arch-note__body {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: rgba(233, 243, 239, .82);
}

/* ---------- 流程 ---------- */
.page-about .arch-flow__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 40px);
}

.page-about .proc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .proc-list::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 12px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, rgba(138, 163, 156, .5), rgba(138, 163, 156, .06));
}

.page-about .proc-step {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 18px);
  padding-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .proc-step:last-child {
  padding-bottom: 0;
}

.page-about .proc-step__no {
  position: relative;
  z-index: 1;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--turf-400);
  background: var(--ink-950);
  border: 1px solid rgba(61, 240, 138, .3);
}

.page-about .proc-step__title {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: .01em;
  color: var(--mist-050);
}

.page-about .proc-step__text {
  margin: 0;
  max-width: 48ch;
  font-size: .94rem;
  line-height: 1.75;
  color: rgba(233, 243, 239, .76);
}

.page-about .arch-flow__media {
  margin: 0;
  padding: 8px;
  background: var(--panel-800);
  border: 1px solid var(--line);
}

.page-about .arch-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.8) brightness(.86);
}

.page-about .arch-flow__media figcaption {
  padding: 9px 4px 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--slate-500);
}

/* ---------- 竖向时间线 ---------- */
.page-about .vtl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .vtl::before {
  content: "";
  position: absolute;
  left: var(--vtl-axis);
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--turf-400) 0%, rgba(61, 240, 138, .35) 55%, rgba(138, 163, 156, .14) 100%);
}

.page-about .vtl__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--vtl-col) minmax(0, 1fr);
  gap: clamp(14px, 2.6vw, 28px);
  padding-bottom: clamp(20px, 3vw, 32px);
}

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

.page-about .vtl__marker {
  position: relative;
}

.page-about .vtl__marker::after {
  content: "";
  position: absolute;
  left: calc(var(--vtl-axis) - 6px);
  top: 6px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  background: var(--ink-950);
  border: 1px solid var(--turf-400);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px var(--ink-950);
}

.page-about .vtl__ver {
  display: block;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--mist-050);
}

.page-about .vtl__title {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  letter-spacing: -.005em;
  color: var(--mist-050);
}

.page-about .vtl__text {
  margin: 0;
  max-width: 56ch;
  font-size: .94rem;
  line-height: 1.75;
  color: rgba(233, 243, 239, .76);
}

.page-about .vtl__text a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(42, 212, 198, .4);
}

.page-about .vtl__text a:hover,
.page-about .vtl__text a:focus-visible {
  border-bottom-color: var(--cyan-400);
}

.page-about .vtl__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 11px 0 0;
  padding: 0;
}

.page-about .vtl__tags li {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 3px 8px;
  color: var(--slate-500);
  border: 1px solid var(--line);
}

/* ---------- 编务 ---------- */
.page-about .arch-desk__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 40px);
}

.page-about .arch-desk__cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 1.8vw, 18px);
}

.page-about .desk-card {
  position: relative;
  padding: clamp(15px, 2vw, 20px);
  background: var(--panel-800);
  border: 1px solid var(--line);
  border-top: 2px solid var(--turf-400);
  transition: border-color .22s ease, background-color .22s ease;
}

.page-about .desk-card:hover {
  border-color: rgba(61, 240, 138, .55);
}

.page-about .desk-card__no {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.page-about .desk-card__count {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.8rem, 4.6vw, 2.4rem);
  line-height: 1;
  color: var(--turf-400);
}

.page-about .desk-card__unit {
  margin-left: 4px;
  font-size: .5em;
  letter-spacing: .1em;
  color: var(--slate-500);
}

.page-about .desk-card__role {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  color: var(--mist-050);
}

.page-about .desk-card__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: rgba(233, 243, 239, .74);
}

.page-about .desk-card--lead {
  border-top-color: var(--amber-400);
}

.page-about .arch-desk__media {
  margin: 0;
  padding: 8px;
  background: var(--panel-800);
  border: 1px solid var(--line);
}

.page-about .arch-desk__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 11;
  object-fit: cover;
  filter: saturate(.75) brightness(.85);
}

.page-about .arch-desk__media figcaption {
  padding: 9px 4px 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--slate-500);
}

/* ---------- 观察席 ---------- */
.page-about .watch-seats {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .watch-seats li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: clamp(14px, 2vw, 20px);
  background: var(--ink-950);
  font-size: .93rem;
  line-height: 1.7;
  color: rgba(233, 243, 239, .82);
}

.page-about .watch-seats li span {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--turf-400);
}

.page-about .arch-watch__foot {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--slate-500);
}

.page-about .arch-watch__foot a {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(42, 212, 198, .4);
}

.page-about .arch-watch__foot a:hover,
.page-about .arch-watch__foot a:focus-visible {
  border-bottom-color: var(--cyan-400);
}

/* ---------- 纠错 ---------- */
.page-about .arch-fix {
  border-top: 0;
}

.page-about .arch-fix__panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(20px, 3.2vw, 34px);
  background: var(--gradient-stand);
  border: 1px solid var(--line);
}

.page-about .arch-fix__main .arch-sec__title {
  margin-bottom: 4px;
}

.page-about .arch-fix__main p {
  margin: 12px 0 0;
  max-width: 48ch;
  font-size: .96rem;
  line-height: 1.78;
  color: rgba(233, 243, 239, .84);
}

.page-about .arch-fix__side {
  border-left: 2px solid var(--turf-400);
  padding-left: clamp(14px, 2vw, 20px);
}

.page-about .arch-fix__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.page-about .arch-fix__big {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  line-height: 1;
  color: var(--turf-400);
}

.page-about .arch-fix__small {
  margin: 8px 0 0;
  font-size: .86rem;
  line-height: 1.68;
  color: var(--slate-500);
}

.page-about .arch-fix__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .arch-fix__links .btn {
  min-height: 44px;
  padding-inline: 18px;
}

/* ---------- 两栏布局 ---------- */
@media (min-width: 620px) {
  .page-about .arch-desk__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .desk-card--lead {
    grid-column: 1 / -1;
  }
}

@media (min-width: 640px) {
  .page-about .watch-seats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .desk-card--lead {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: clamp(16px, 2.6vw, 30px);
  }

  .page-about .desk-card--lead .desk-card__no,
  .page-about .desk-card--lead .desk-card__count,
  .page-about .desk-card--lead .desk-card__role {
    margin: 0;
    flex: 0 0 auto;
  }

  .page-about .desk-card--lead .desk-card__text {
    flex: 1 1 240px;
    min-width: 0;
  }
}

@media (min-width: 880px) {
  .page-about .arch-fix__panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

@media (min-width: 920px) {
  .page-about .arch-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .arch-flow__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .arch-desk__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .desk-card,
  .page-about .arch-crumb a {
    transition: none;
  }
}