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

.page-about .about-crumb {
  padding-top: 14px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(16px, 3vw, 30px) clamp(34px, 6vw, 64px);
  border-bottom: var(--bd) solid var(--c-navy);
  background: linear-gradient(180deg, var(--c-mist) 0%, var(--c-paper) 82%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.6vw, 58px);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title .hl {
  color: var(--c-blue);
  box-shadow: inset 0 -0.22em 0 var(--c-orange-soft);
}

.page-about .about-hero__lede {
  margin-top: clamp(16px, 2.6vw, 24px);
  max-width: 34em;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .plate {
  border: var(--bd-heavy) solid var(--c-navy);
  background: var(--c-paper);
  box-shadow: var(--shadow-hard);
}

.page-about .plate__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: var(--c-navy);
  color: var(--c-paper);
}

.page-about .plate__head-text {
  font-size: 12px;
  letter-spacing: 0.14em;
}

.page-about .plate__spark {
  width: 84px;
  height: 18px;
  color: var(--c-orange);
  flex: none;
}

.page-about .plate__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 16px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .plate__row--last {
  border-bottom: 0;
}

.page-about .plate__num {
  font-size: clamp(19px, 2.6vw, 23px);
  font-weight: 700;
  color: var(--c-blue);
  white-space: nowrap;
}

.page-about .plate__key {
  font-size: 13px;
  color: var(--ink-soft);
  text-align: right;
}

/* ---------- 区块骨架 ---------- */
.page-about .about-sec {
  padding-block: clamp(34px, 6vw, 72px);
  border-bottom: var(--bd) solid var(--c-line);
}

.page-about .about-sec--mist {
  background: var(--c-mist);
}

.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3.6vw, 40px);
  align-items: start;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .prose p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 34em;
}

.page-about .prose p + p {
  margin-top: 14px;
}

.page-about .prose .lede {
  font-size: 17px;
  color: var(--ink);
  font-weight: 500;
}

.page-about .prose a {
  color: var(--c-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 覆盖面板 ---------- */
.page-about .scope-panel {
  border: var(--bd) solid var(--c-navy);
  background: var(--c-paper);
  box-shadow: var(--shadow-line);
  padding: clamp(16px, 2.6vw, 22px);
}

.page-about .scope-panel__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-blue);
  text-transform: uppercase;
}

.page-about .scope-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .scope-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  background: var(--c-mist);
  border-left: 6px solid var(--c-blue);
}

.page-about .scope-item:nth-child(3),
.page-about .scope-item:nth-child(4) {
  border-left-color: var(--c-amber);
}

.page-about .scope-item strong {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.page-about .scope-panel .note {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .scope-panel__link {
  margin-top: 14px;
  display: inline-block;
}

/* ---------- 准入 ---------- */
.page-about .admit-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .admit-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 16px;
  background: var(--c-paper);
  border: var(--bd) solid var(--c-line);
  border-top: var(--bd-heavy) solid var(--c-blue);
  box-shadow: 4px 4px 0 var(--c-line);
  transition: transform var(--ease), box-shadow var(--ease);
}

.page-about .admit-item:hover {
  transform: translateY(-2px);
  box-shadow: 6px 6px 0 var(--c-line);
}

.page-about .admit-item__no {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-orange);
  line-height: 1.2;
}

.page-about .admit-item__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--c-navy);
}

.page-about .admit-item__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .about-media {
  background: var(--c-mist);
}

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

/* ---------- 流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 16px;
}

.page-about .flow__step {
  border-top: var(--bd-heavy) solid var(--c-navy);
  padding-top: 10px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .flow__step--end {
  border-top-color: var(--c-orange);
}

.page-about .flow__no {
  font-size: 12px;
  color: var(--c-blue);
  font-weight: 700;
}

.page-about .flow__name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-navy);
}

.page-about .about-split--reflow {
  align-items: start;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline-wrap {
  display: grid;
  gap: 16px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-side-note {
  display: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  color: var(--ink-soft);
  writing-mode: vertical-rl;
  border-left: var(--bd-heavy) solid var(--c-orange);
  padding-left: 8px;
  height: max-content;
  position: sticky;
  top: 120px;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: linear-gradient(180deg, var(--c-orange) 0%, var(--c-blue) 45%, var(--c-line) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(18px, 2.6vw, 26px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 4px;
  width: 13px;
  height: 13px;
  background: var(--c-paper);
  border: var(--bd-heavy) solid var(--c-navy);
  border-radius: 50%;
}

.page-about .timeline__item--now::before {
  background: var(--c-orange);
  border-color: var(--c-orange);
  box-shadow: 0 0 0 4px var(--c-orange-soft);
}

.page-about .timeline__ver {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-blue);
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  padding: 3px 8px;
}

.page-about .timeline__item--now .timeline__ver {
  color: var(--c-paper);
  background: var(--c-blue);
  border-color: var(--c-blue);
}

.page-about .timeline__title {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--c-navy);
}

.page-about .timeline__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 46em;
}

.page-about .about-timeline__more {
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 规模数字 ---------- */
.page-about .stat-strip {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: var(--bd) solid var(--c-navy);
  background: var(--c-paper);
  box-shadow: var(--shadow-line);
}

.page-about .stat-cell {
  padding: 14px 14px 16px;
  border-bottom: 1px solid var(--c-line);
  border-right: 1px solid var(--c-line);
}

.page-about .stat-num {
  display: block;
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 700;
  color: var(--c-blue);
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.page-about .stat-key {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ---------- 承诺 ---------- */
.page-about .about-split--promise {
  align-items: start;
}

.page-about .review-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.page-about .promise-card {
  background: var(--c-forest);
  color: var(--c-paper);
  border: var(--bd-heavy) solid #0d2b24;
  box-shadow: 7px 7px 0 var(--c-line);
  padding: clamp(18px, 3vw, 28px);
}

.page-about .promise-card__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: #9dc4b4;
}

.page-about .promise-item {
  border-top: 1px solid rgba(232, 240, 247, 0.28);
}

.page-about .promise-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-paper);
}

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

.page-about .promise-item__sign {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-about .promise-item__sign::before,
.page-about .promise-item__sign::after {
  content: "";
  position: absolute;
  background: var(--c-orange);
}

.page-about .promise-item__sign::before {
  left: 0;
  right: 0;
  top: 6px;
  height: 2px;
}

.page-about .promise-item__sign::after {
  top: 0;
  bottom: 0;
  left: 6px;
  width: 2px;
}

.page-about .promise-item[open] .promise-item__sign::after {
  display: none;
}

.page-about .promise-item__body {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: #cfe0d6;
  max-width: 32em;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  background: var(--c-navy);
  color: var(--c-paper);
  padding-block: clamp(28px, 5vw, 52px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
  align-items: center;
}

.page-about .about-cta__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--c-orange);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 38px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.01em;
  max-width: 20em;
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-invert);
  max-width: 36em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-split--rev {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-split--promise {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .flow {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

  .page-about .about-timeline-wrap {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 26px;
  }

  .page-about .about-side-note {
    display: block;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    justify-content: space-between;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1080px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .admit-item {
    transition: none;
  }

  .page-about .admit-item:hover {
    transform: none;
  }
}