.page-about {
  --about-measure: 34em;
  --about-line: 1px solid var(--hair);
  background: var(--ink);
  color: var(--text);
  font-family: var(--sans);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 1.35rem;
  padding-bottom: 0.4rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-about .breadcrumbs__link {
  color: var(--kiwi);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  border-bottom-color: var(--kiwi);
}

/* ---------- 开篇 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 5vw, 3.5rem) 0 clamp(2rem, 5vw, 4rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -18% -34% auto -34%;
  height: 68%;
  background: linear-gradient(152deg, var(--night) 0%, rgba(18, 59, 44, 0.35) 48%, transparent 78%);
  transform: skewY(-4deg);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(168, 240, 60, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 240, 60, 0.06) 1px, transparent 1px);
  background-size: 76px 76px;
  pointer-events: none;
  z-index: 0;
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 72%);
  mask-image: linear-gradient(180deg, #000, transparent 72%);
}

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

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 clamp(1rem, 2.5vw, 1.5rem);
  padding: 0.3rem 0.85rem 0.3rem 0.6rem;
  border: 1px solid var(--hair-strong);
  border-radius: var(--r-pill);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--kiwi-soft);
  background: rgba(10, 42, 32, 0.6);
}

.page-about .about-hero__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--kiwi);
  box-shadow: 0 0 0 4px rgba(168, 240, 60, 0.16);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(1rem, 2.5vw, 1.5rem);
  font-size: clamp(2.1rem, 6.4vw, 4.9rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.03em;
  max-width: 15ch;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--kiwi);
  position: relative;
  white-space: nowrap;
}

.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.08em;
  height: 0.14em;
  background: var(--flame);
  opacity: 0.75;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: var(--about-measure);
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  line-height: 1.9;
  letter-spacing: 0.01em;
  color: var(--text-dim);
}

.page-about .about-hero__figure {
  margin: clamp(1.75rem, 4.5vw, 3rem) 0 0;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: clamp(1.5rem, 4vw, 3rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 左侧章节刻度 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail__tag {
  display: block;
  margin: 0 0 0.75rem;
  color: var(--text-dim);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .rail__link {
  display: block;
  padding: 0.35rem 0 0.35rem 0.85rem;
  border-left: 2px solid var(--hair);
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.5;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .rail__link:hover,
.page-about .rail__link:focus-visible {
  color: var(--kiwi-soft);
  border-left-color: var(--hair-strong);
}

.page-about .rail__link[aria-current="true"] {
  color: var(--kiwi);
  border-left-color: var(--kiwi);
  padding-left: 1.15rem;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(2.25rem, 6vw, 4rem);
  border-top: var(--about-line);
}

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

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 clamp(0.7rem, 2vw, 1.4rem);
  align-items: start;
  margin-bottom: clamp(1rem, 3vw, 1.75rem);
}

.page-about .about-chapter__num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: rgba(168, 240, 60, 0.3);
  margin-top: 0.06em;
  user-select: none;
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.45rem, 3.4vw, 2.4rem);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.03em;
  color: var(--text);
}

.page-about .about-chapter__body {
  display: grid;
  gap: 1rem;
  max-width: var(--about-measure);
  font-size: clamp(1rem, 1.35vw, 1.06rem);
  line-height: 1.85;
  letter-spacing: 0.01em;
}

.page-about .about-chapter__body--wide {
  max-width: none;
}

.page-about .about-chapter__body p {
  margin: 0;
  color: var(--text-dim);
}

.page-about .about-chapter__body h3 {
  margin: 0 0 0.35rem;
  font-size: 1.06rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--text);
}

/* 暖纸色章节 */
.page-about .about-chapter--paper {
  margin-block: clamp(0.5rem, 2vw, 1.25rem);
  padding: clamp(1.4rem, 4vw, 2.6rem);
  background: var(--paper);
  border: 2px solid var(--paper-edge);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-hard);
}

.page-about .about-chapter--paper .about-chapter__title {
  color: var(--paper-ink);
}

.page-about .about-chapter--paper .about-chapter__num {
  color: rgba(19, 32, 24, 0.22);
}

.page-about .about-chapter--paper .about-chapter__body p {
  color: rgba(19, 32, 24, 0.84);
}

.page-about .about-chapter--paper .about-chapter__body h3 {
  color: var(--paper-ink);
}

/* ---------- 01 规模数据 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 0.5rem 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair);
  border: 2px solid var(--hair);
  border-radius: var(--r-card);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: grid;
  gap: 0.35rem;
  align-content: start;
  padding: clamp(0.9rem, 2.6vw, 1.4rem);
  background: var(--night);
}

.page-about .about-stats__num {
  font-family: var(--mono);
  font-size: clamp(1.5rem, 4.2vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--kiwi);
}

.page-about .about-stats__label {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

/* ---------- 02 编辑组卡片 ---------- */
.page-about .about-crew {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-crew__card {
  display: grid;
  gap: 0.55rem;
  align-content: start;
  padding: clamp(1rem, 2.6vw, 1.5rem);
  background: var(--night);
  border: 2px solid var(--hair-strong);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-hard-sm);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-crew__card:hover,
.page-about .about-crew__card:focus-within {
  transform: translate(-2px, -2px);
  border-color: var(--kiwi);
  box-shadow: var(--shadow-hard);
}

.page-about .about-crew__role {
  justify-self: start;
  margin: 0;
  padding: 0.2rem 0.7rem;
  border-radius: var(--r-pill);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  background: var(--kiwi);
  color: var(--ink);
}

.page-about .about-crew__card:nth-child(2) .about-crew__role {
  background: var(--cobalt);
  color: #f4f8ff;
}

.page-about .about-crew__card:nth-child(3) .about-crew__role {
  background: var(--flame);
  color: var(--ink);
}

.page-about .about-crew__card:nth-child(4) .about-crew__role {
  background: var(--kiwi-soft);
  color: var(--ink);
}

.page-about .about-crew__name {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-crew__desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-crew__keys {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--kiwi);
  opacity: 0.62;
  transition: opacity var(--dur) var(--ease);
}

.page-about .about-crew__card:hover .about-crew__keys,
.page-about .about-crew__card:focus-within .about-crew__keys {
  opacity: 1;
}

/* ---------- 03 四步流程 ---------- */
.page-about .about-chapter__lead {
  font-size: clamp(1.02rem, 1.5vw, 1.1rem);
}

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure--square {
  max-width: min(420px, 100%);
  margin-top: 0.75rem;
}

.page-about .about-steps {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  padding: 0.9rem 1rem;
  background: rgba(220, 210, 187, 0.4);
  border-left: 4px solid var(--cobalt-deep);
  border-radius: 0 12px 12px 0;
}

.page-about .about-steps__mark {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  padding-top: 0.22rem;
  color: var(--cobalt-deep);
  white-space: nowrap;
}

.page-about .about-steps__text p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
}

/* ---------- 04 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 0.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 1.4rem;
  bottom: 1.4rem;
  width: 2px;
  background: linear-gradient(180deg, var(--kiwi), var(--cobalt) 62%, rgba(42, 99, 232, 0.15));
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 0 0.85rem;
}

.page-about .about-timeline__dot {
  grid-column: 1;
  justify-self: center;
  align-self: start;
  margin-top: 1.15rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--kiwi);
  box-sizing: content-box;
}

.page-about .about-timeline__dot--now {
  border-color: var(--flame);
  box-shadow: 0 0 0 5px rgba(255, 122, 51, 0.18);
}

.page-about .about-timeline__panel {
  background: var(--night);
  border: 2px solid var(--hair);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-timeline__panel:hover {
  border-color: var(--hair-strong);
}

.page-about .about-timeline__trigger,
.page-about .about-timeline__static {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.85rem;
  padding: 0.9rem 1.05rem;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
}

.page-about .about-timeline__trigger {
  cursor: pointer;
}

.page-about .about-timeline__trigger:focus-visible {
  outline: 2px solid var(--kiwi);
  outline-offset: -4px;
}

.page-about .about-timeline__season {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--kiwi);
  white-space: nowrap;
}

.page-about .about-timeline__head {
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-timeline__note {
  margin: 0;
  padding: 0 1.05rem 1rem;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-timeline__panel--now {
  border-color: rgba(255, 122, 51, 0.45);
}

/* ---------- 05 读者 ---------- */
.page-about .about-readers {
  margin: 0.5rem 0 0;
  display: grid;
  gap: 0;
}

.page-about .about-readers__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.3rem;
  padding: 1rem 0;
  border-top: 1px solid var(--paper-edge);
}

.page-about .about-readers__row:first-child {
  border-top: 0;
  padding-top: 0.25rem;
}

.page-about .about-readers__who {
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--paper-ink);
  padding-left: 0.75rem;
  border-left: 4px solid var(--cobalt);
}

.page-about .about-readers__what {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.82;
  color: rgba(19, 32, 24, 0.8);
}

.page-about .about-readers__reach {
  margin-top: 0.5rem;
  padding: 0.9rem 1.05rem;
  background: rgba(11, 42, 99, 0.08);
  border-left: 4px solid var(--flame);
  border-radius: 0 12px 12px 0;
  font-size: 0.95rem;
  color: var(--paper-ink) !important;
}

/* ---------- 06 价值三档 ---------- */
.page-about .about-value {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-value__card {
  display: grid;
  gap: 0.5rem;
  align-content: start;
  padding: clamp(1rem, 2.6vw, 1.5rem);
  background: linear-gradient(160deg, var(--night), rgba(11, 42, 99, 0.6));
  border: 2px solid var(--hair-strong);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-value__tag {
  justify-self: start;
  margin: 0;
  padding: 0.2rem 0.7rem;
  border: 1px solid var(--kiwi);
  border-radius: var(--r-pill);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--kiwi);
}

.page-about .about-value__title {
  margin: 0;
  font-size: 1.14rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-value__card p:last-child {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 收尾行动区 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.25rem;
  padding: clamp(1.1rem, 3vw, 1.75rem);
  background: var(--paper);
  border: 2px solid var(--paper-edge);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--paper-ink);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.page-about .about-cta__note {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: rgba(19, 32, 24, 0.72);
}

.page-about .about-cta__note a {
  color: var(--cobalt-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__note a:hover {
  color: var(--flame);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-readers__row {
    grid-template-columns: minmax(150px, 210px) minmax(0, 1fr);
    gap: 1.25rem;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: minmax(148px, 196px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 7.5rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-chapter__body--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 360px);
    align-items: start;
    gap: 1.25rem 2rem;
    max-width: none;
  }

  .page-about .about-chapter__body--split .about-chapter__lead {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-chapter__body--split .about-figure {
    grid-column: 2;
    grid-row: 1 / span 2;
    margin-top: 0.25rem;
  }

  .page-about .about-chapter__body--split .about-steps {
    grid-column: 1;
    grid-row: 2;
    margin-top: 0;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__lead {
    font-size: 1.12rem;
  }

  .page-about .about-chapter__title {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__card,
  .page-about .about-crew__keys,
  .page-about .rail__link,
  .page-about .about-timeline__panel {
    transition: none;
  }
}