.page-about {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background-color: var(--ink-deep);
  color: var(--on-deep);
  padding: clamp(7rem, 15vw, 11rem) 0 clamp(3rem, 6vw, 5rem);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(45deg, rgba(201, 162, 74, 0.055) 25%, transparent 25%, transparent 75%, rgba(201, 162, 74, 0.055) 75%),
    linear-gradient(45deg, rgba(201, 162, 74, 0.055) 25%, transparent 25%, transparent 75%, rgba(201, 162, 74, 0.055) 75%);
  background-size: 34px 34px;
  background-position: 0 0, 17px 17px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -24%;
  width: 58vw;
  height: 58vw;
  max-width: 640px;
  max-height: 640px;
  background: radial-gradient(circle at 50% 50%, rgba(201, 162, 74, 0.18), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumbs {
  font-family: var(--font-body);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--on-deep-soft);
}

.page-about .about-hero__crumbs a {
  color: var(--on-deep-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 74, 0.34);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-hero__crumbs a:hover,
.page-about .about-hero__crumbs a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .about-hero__crumbs [aria-current="page"] {
  color: var(--gold-soft);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 1.5rem;
  margin-top: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-hero__mark {
  display: none;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: var(--h1);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--paper-bright);
  margin: 0.65rem 0 0;
  max-width: 16em;
}

.page-about .about-hero__lede {
  margin: clamp(1rem, 2.4vw, 1.6rem) 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.25vw, 1.12rem);
  line-height: 1.9;
  color: var(--on-deep);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: clamp(1.25rem, 2.5vw, 1.75rem) 0 0;
  border-top: 1px solid var(--line-gold);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1.25rem 1rem;
}

.page-about .about-hero__fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .about-hero__fact-label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.84rem;
  letter-spacing: 0.03em;
  color: var(--on-deep-soft);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding: clamp(2.75rem, 7vw, 5.5rem) 0 clamp(2.5rem, 5vw, 4rem);
}

.page-about .about-body__grid {
  display: grid;
  gap: clamp(2.25rem, 5vw, 3.5rem);
}

.page-about .about-panel {
  order: -1;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-top: clamp(2.25rem, 4.5vw, 3.25rem);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section__head h2 {
  font-family: var(--font-display);
  font-size: var(--h2);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.018em;
  color: var(--ink-deep);
  margin: 0.55rem 0 0;
  max-width: 18em;
}

.page-about .about-section__p {
  margin: 1.05rem 0 0;
  max-width: 36em;
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-media {
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(1.75rem, 3.4vw, 2.5rem) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 1.9rem;
  padding-bottom: 1.75rem;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0.26rem;
  top: 1.05rem;
  bottom: 0;
  width: 1px;
  background: linear-gradient(var(--line-gold), rgba(201, 162, 74, 0.12));
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0.32rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 74, 0.16);
}

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

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.16em;
  color: var(--bronze);
}

.page-about .about-timeline__title {
  margin: 0.4rem 0 0;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink-deep);
}

.page-about .about-timeline__text {
  margin: 0.35rem 0 0;
  max-width: 34em;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 排序依据 ---------- */
.page-about .about-order {
  list-style: none;
  margin: clamp(1.5rem, 3vw, 2.25rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.4rem;
}

.page-about .about-order__item {
  position: relative;
  padding-left: 3.1rem;
}

.page-about .about-order__num {
  position: absolute;
  left: 0;
  top: 0.05rem;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-order__num::after {
  content: "";
  position: absolute;
  left: 1.55rem;
  top: 0.35rem;
  width: 0.9rem;
  height: 1px;
  background: var(--line-gold);
}

.page-about .about-order__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--ink-deep);
}

.page-about .about-order__text {
  margin: 0.4rem 0 0;
  max-width: 34em;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 规模表格 ---------- */
.page-about .about-scale {
  margin-top: clamp(1.75rem, 3.4vw, 2.5rem);
  border-top: 1px solid var(--line);
}

.page-about .about-scale__row {
  display: grid;
  grid-template-columns: minmax(4rem, 6.5rem) minmax(0, 1fr);
  gap: 0.75rem 1.25rem;
  align-items: baseline;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-mid);
}

.page-about .about-scale__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink-deep);
}

.page-about .about-scale__text {
  margin: 0.35rem 0 0;
  max-width: 32em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 三步工序 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(1.75rem, 3.4vw, 2.5rem) 0 0;
  padding: 0;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: 0.5rem 1rem;
  padding: 1.15rem 0;
  border-top: 1px solid var(--line);
}

.page-about .about-steps__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-steps__no {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--gold);
  padding-top: 0.32rem;
}

.page-about .about-steps__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--ink-deep);
}

.page-about .about-steps__text {
  margin: 0.35rem 0 0;
  max-width: 34em;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--ink);
}

/* ---------- 设备与范围 ---------- */
.page-about .about-devices {
  list-style: none;
  margin: clamp(1.6rem, 3.2vw, 2.25rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-devices__item {
  display: grid;
  gap: 0.45rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-devices__tag {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  padding: 0.22rem 0.6rem;
  border-radius: 999px;
  background: rgba(201, 162, 74, 0.18);
  color: var(--bronze);
}

.page-about .about-devices__item--slate .about-devices__tag {
  background: rgba(110, 127, 141, 0.18);
  color: var(--slate);
}

.page-about .about-devices__text {
  margin: 0;
  max-width: 34em;
  font-size: 0.97rem;
  line-height: 1.82;
  color: var(--ink);
}

/* ---------- 运营节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: clamp(1.75rem, 3.4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.4rem;
}

.page-about .about-rhythm__when {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.16em;
  color: var(--bronze);
}

.page-about .about-rhythm__what {
  margin: 0.4rem 0 0;
  max-width: 26em;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--ink);
}

/* ---------- 侧栏面板 ---------- */
.page-about .about-panel__inner {
  position: relative;
  background-color: var(--ink-mid);
  border-top: 2px solid var(--gold);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 2.6vw, 1.75rem);
  color: var(--on-deep);
  overflow: hidden;
  box-shadow: 0 26px 52px -34px rgba(13, 42, 34, 0.72);
}

.page-about .about-panel__inner::after {
  content: "";
  position: absolute;
  right: -30%;
  bottom: -35%;
  width: 80%;
  height: 80%;
  background: radial-gradient(circle at 50% 50%, rgba(201, 162, 74, 0.14), transparent 70%);
  pointer-events: none;
}

.page-about .about-panel__list {
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
  position: relative;
  z-index: 1;
}

.page-about .about-panel__list a {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  padding: 0.5rem 0.1rem;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--on-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 74, 0.15);
  transition: color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-panel__list a:hover,
.page-about .about-panel__list a:focus-visible {
  color: var(--gold);
  transform: translateX(3px);
}

.page-about .about-panel__no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--gold-soft);
}

.page-about .about-panel__status {
  position: relative;
  z-index: 1;
  margin-top: clamp(1.25rem, 2.5vw, 1.75rem);
  padding-top: clamp(1.1rem, 2.2vw, 1.5rem);
  border-top: 1px solid var(--line-gold);
}

.page-about .about-panel__dl {
  margin: 0.75rem 0 0;
}

.page-about .about-panel__dl > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.42rem 0;
  border-bottom: 1px dashed rgba(201, 162, 74, 0.22);
  font-size: 0.84rem;
}

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

.page-about .about-panel__dl dt {
  color: var(--on-deep-soft);
}

.page-about .about-panel__dl dd {
  margin: 0;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--gold);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-next {
  position: relative;
  background-color: var(--ink-deep);
  color: var(--on-deep);
  padding: clamp(2.75rem, 6vw, 4.5rem) 0;
  overflow: hidden;
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(45deg, rgba(201, 162, 74, 0.05) 25%, transparent 25%, transparent 75%, rgba(201, 162, 74, 0.05) 75%),
    linear-gradient(45deg, rgba(201, 162, 74, 0.05) 25%, transparent 25%, transparent 75%, rgba(201, 162, 74, 0.05) 75%);
  background-size: 30px 30px;
  background-position: 0 0, 15px 15px;
  pointer-events: none;
}

.page-about .about-next__shell {
  position: relative;
  z-index: 1;
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.35rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--paper-bright);
  margin: 0.5rem 0 0;
  max-width: 16em;
}

.page-about .about-next__text {
  margin: 1rem 0 0;
  max-width: 42em;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--on-deep);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-rhythm__item {
    padding: 0 1.35rem;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rhythm__item:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-media--inset {
    max-width: 82%;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: auto minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-hero__mark {
    display: block;
    writing-mode: vertical-rl;
    font-family: var(--font-body);
    font-size: 0.78rem;
    letter-spacing: 0.34em;
    color: var(--on-deep-soft);
    margin: 0.6rem 0 0;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body__grid {
    grid-template-columns: minmax(0, 1fr) 292px;
    gap: clamp(2.5rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .about-stream {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-panel {
    grid-column: 2;
    grid-row: 1;
    order: 0;
  }

  .page-about .about-panel__inner {
    position: sticky;
    top: 6.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-panel__list a,
  .page-about .about-hero__crumbs a {
    transition: none;
  }
}