.page-about {
  --about-cut: 20px;
  background: var(--ink-green);
  color: var(--spot-white);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about p {
  line-height: 1.75;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-top: clamp(1rem, 3vw, 1.6rem);
}

.page-about .about-crumb__sep {
  color: var(--moss);
  opacity: .6;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.6rem, 5vw, 2.6rem) 0 clamp(1.6rem, 4vw, 3rem);
  background:
    radial-gradient(130% 110% at 88% 0%, rgba(23, 184, 90, .26), transparent 58%),
    linear-gradient(158deg, var(--night-green) 0%, var(--ink-green) 64%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 auto;
  width: min(48%, 520px);
  height: 100%;
  background: linear-gradient(200deg, rgba(255, 212, 0, .10), transparent 68%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.4rem);
  align-items: end;
}

.page-about .about-hero__h1 {
  margin: .45rem 0 0;
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  line-height: 1.02;
  letter-spacing: .012em;
}

.page-about .about-hero__lede {
  margin: 1rem 0 0;
  max-width: 62ch;
  color: var(--moss);
}

.page-about .about-meter {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-meter__row {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .7rem .95rem;
  background: rgba(14, 59, 41, .78);
}

.page-about .about-meter__val {
  font-family: var(--font-data);
  font-size: 1.6rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--turf);
}

.page-about .about-meter__key {
  font-size: .92rem;
  color: var(--moss);
}

/* 主布局 */
.page-about .about-layout {
  display: grid;
  gap: clamp(1.8rem, 4vw, 3rem);
  padding-block: clamp(2rem, 5vw, 3.6rem) clamp(2.6rem, 6vw, 4.5rem);
}

/* 索引 */
.page-about .about-index {
  border: 1px solid var(--line);
  background: rgba(14, 59, 41, .55);
  padding: 1rem 1rem 1.1rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-index__title {
  margin: 0;
  font-family: var(--font-data);
  font-size: .76rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .about-index__list {
  list-style: none;
  margin: .7rem 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index__list a {
  display: flex;
  gap: .6rem;
  align-items: baseline;
  padding: .42rem .55rem;
  color: var(--moss);
  text-decoration: none;
  border-left: 2px solid transparent;
  font-size: .9rem;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--spot-white);
  border-left-color: var(--alert-yellow);
  background: rgba(23, 184, 90, .14);
}

.page-about .about-index__n {
  font-family: var(--font-data);
  font-size: .78rem;
  color: var(--turf);
  font-variant-numeric: tabular-nums;
}

.page-about .about-index__foot {
  margin: 1rem 0 0;
  padding-top: .8rem;
  border-top: 1px solid var(--line);
  font-size: .84rem;
  color: var(--moss);
}

/* 正文列 */
.page-about .about-body {
  position: relative;
  display: grid;
  gap: clamp(2.4rem, 5vw, 3.6rem);
  min-width: 0;
}

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

.page-about .about-sec {
  position: relative;
  scroll-margin-top: 1.5rem;
  min-width: 0;
}

.page-about .about-sec__mark {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin: 0 0 .8rem;
  padding-bottom: .55rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: .8rem;
  letter-spacing: .12em;
  color: var(--moss);
}

.page-about .about-sec__n {
  display: inline-block;
  padding: .1rem .42rem;
  background: var(--turf);
  color: var(--ink-green);
  font-weight: 700;
}

.page-about .about-sec .section-title {
  margin: 0 0 .9rem;
}

/* 图文分栏 */
.page-about .about-split {
  display: grid;
  gap: 1.2rem;
  margin-top: 1rem;
}

.page-about .about-split__text p {
  margin: 0 0 .9rem;
}

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

.page-about .about-figure__cap {
  margin: .6rem 0 0;
  font-size: .84rem;
  color: var(--moss);
  border-left: 2px solid var(--turf);
  padding-left: .6rem;
}

/* 时间轴 */
.page-about .about-timeline {
  margin: 1.8rem 0 0;
}

.page-about .about-timeline__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .tl-axis {
  stroke: var(--line-strong);
  stroke-width: 2;
  stroke-dasharray: 6 9;
}

.page-about .tl-dot {
  fill: var(--spot-white);
  stroke: var(--turf);
  stroke-width: 3;
}

.page-about .tl-code {
  fill: var(--turf);
  font-family: var(--font-data);
  font-size: 15px;
  letter-spacing: .05em;
}

.page-about .tl-label {
  fill: var(--moss);
  font-family: var(--font-body);
  font-size: 15px;
}

/* 旁注 */
.page-about .about-note {
  margin: 1.4rem 0 0;
  padding: .9rem 1rem;
  background: rgba(255, 212, 0, .06);
  border-left: 3px solid var(--alert-yellow);
  color: var(--moss);
  font-size: .92rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

/* 步骤条 */
.page-about .about-steps {
  display: grid;
  gap: .7rem;
  margin-top: 1.5rem;
}

.page-about .about-step {
  border: 1px solid var(--line);
  background: rgba(14, 59, 41, .6);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-step[open] {
  border-color: var(--line-strong);
  background: rgba(14, 59, 41, .9);
}

.page-about .about-step:hover {
  border-color: var(--warn-line);
  transform: translateX(2px);
}

.page-about .about-step > summary {
  display: flex;
  gap: .7rem;
  align-items: baseline;
  padding: .85rem 1rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--spot-white);
}

.page-about .about-step > summary::-webkit-details-marker,
.page-about .about-fieldgroup > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-step__n {
  font-family: var(--font-data);
  font-weight: 400;
  font-size: 1rem;
  color: var(--turf);
  font-variant-numeric: tabular-nums;
}

.page-about .about-step__body {
  padding: .2rem 1rem 1rem;
  border-top: 1px solid var(--line);
}

.page-about .about-step__body p {
  margin: .7rem 0 0;
  font-size: .95rem;
  color: var(--moss);
}

.page-about .about-step__meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: .9rem !important;
}

.page-about .about-step__tag {
  font-family: var(--font-data);
  font-size: .76rem;
  color: var(--moss);
  border: 1px solid var(--line-strong);
  padding: .16rem .5rem;
}

/* 纹理图 */
.page-about .about-texture {
  margin: 1.6rem 0 0;
  display: grid;
  gap: .8rem;
  align-items: end;
}

.page-about .about-texture .media-frame {
  max-width: 260px;
  opacity: .82;
}

.page-about .about-texture__cap {
  margin: 0;
  font-size: .84rem;
  color: var(--moss);
  max-width: 46ch;
}

/* 分类四级 */
.page-about .about-tier {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-tier__item {
  background: var(--night-green);
  padding: .95rem 1rem;
}

.page-about .about-tier__code {
  font-family: var(--font-data);
  font-size: .76rem;
  letter-spacing: .22em;
  color: var(--alert-yellow);
}

.page-about .about-tier__name {
  margin: .25rem 0 .3rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .about-tier__item p {
  margin: 0;
  font-size: .92rem;
  color: var(--moss);
}

/* 浅色字段面板 */
.page-about .about-light {
  background: var(--paper);
  color: var(--char);
  padding: clamp(1.2rem, 3.5vw, 2.1rem);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-light .section-title {
  color: var(--char);
}

.page-about .about-light .about-sec__mark {
  color: #2F6B4E;
  border-bottom-color: rgba(13, 22, 19, .18);
}

.page-about .about-light .about-sec__n {
  background: var(--char);
  color: var(--paper);
}

.page-about .about-light__lede {
  margin: 0 0 1.2rem;
  color: #3B4A43;
  max-width: 64ch;
}

.page-about .about-fieldgroup {
  border-top: 1px solid rgba(13, 22, 19, .18);
}

.page-about .about-fieldgroup > summary {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: .8rem .2rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--char);
  transition: color var(--dur) var(--ease);
}

.page-about .about-fieldgroup > summary:hover {
  color: #0E7A44;
}

.page-about .about-fieldgroup__count {
  font-family: var(--font-data);
  font-size: .8rem;
  font-weight: 400;
  color: #0E7A44;
}

.page-about .about-fields {
  display: grid;
  gap: .6rem;
  margin: 0 0 1rem;
  padding: 0;
}

.page-about .about-field {
  display: grid;
  gap: .15rem;
  padding-bottom: .55rem;
  border-bottom: 1px dashed rgba(13, 22, 19, .16);
}

.page-about .about-field__name {
  font-family: var(--font-data);
  font-size: 1.06rem;
  font-weight: 600;
  color: var(--char);
  font-variant-numeric: tabular-nums;
}

.page-about .about-field__desc {
  margin: 0;
  font-size: .92rem;
  line-height: 1.7;
  color: #3B4A43;
}

.page-about .about-callout {
  margin-top: 1.4rem;
  padding: 1rem 1.1rem;
  background: rgba(23, 184, 90, .12);
  border-left: 4px solid var(--turf);
}

.page-about .about-callout h3 {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--char);
}

.page-about .about-callout p {
  margin: 0 0 .6rem;
  font-size: .93rem;
  color: #253A31;
}

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

.page-about .about-callout strong {
  font-family: var(--font-data);
  font-weight: 600;
  color: #0E7A44;
}

/* 团队 */
.page-about .about-team {
  list-style: none;
  margin: 1.4rem 0 1.6rem;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .about-team__item {
  border: 1px solid var(--line);
  background: rgba(14, 59, 41, .55);
  padding: .95rem 1rem;
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-data);
  font-size: 2rem;
  line-height: 1;
  color: var(--turf);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__role {
  display: block;
  margin-top: .35rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .about-team__item p {
  margin: .4rem 0 0;
  font-size: .9rem;
  color: var(--moss);
}

/* 更新节奏 */
.page-about .about-cadence {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 1.4rem 0;
}

.page-about .about-cadence__item {
  background: var(--night-green);
  padding: 1rem;
}

.page-about .about-cadence__t {
  display: block;
  font-family: var(--font-data);
  font-size: 1.06rem;
  color: var(--alert-yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .about-cadence__item p {
  margin: .4rem 0 0;
  font-size: .92rem;
  color: var(--moss);
}

/* 延伸入口 */
.page-about .about-exits {
  display: grid;
  gap: .55rem;
  margin-top: 1.7rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.page-about .about-exits .link-arrow {
  font-family: var(--font-data);
  font-size: .94rem;
}

/* 自适应 */
@media (min-width: 640px) {
  .page-about .about-texture {
    grid-template-columns: 240px minmax(0, 1fr);
    align-items: center;
  }

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

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

  .page-about .about-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .7rem 1.6rem;
  }
}

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(1.4rem, 3vw, 2.2rem);
    align-items: start;
  }

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

  .page-about .about-tier {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 1.5rem;
  }

  .page-about .about-ticks {
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    right: -20px;
    width: 6px;
    background: repeating-linear-gradient(to bottom, var(--line-strong) 0 2px, transparent 2px 16px);
  }
}

@media (max-width: 420px) {
  .page-about .about-index,
  .page-about .about-light,
  .page-about .about-meter,
  .page-about .about-note {
    clip-path: none;
  }

  .page-about .about-index {
    border-radius: 2px;
  }
}