.page-about {
  --about-rail: 208px;
  --about-line: rgba(46, 73, 64, 0.7);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: 8px;
}

.page-about .about-crumbs {
  padding-top: 24px;
  font-size: 12px;
  color: var(--moss);
  letter-spacing: 0.02em;
}

.page-about .about-crumbs a {
  color: var(--moss);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-crumbs a:hover {
  color: var(--pitch);
  border-bottom-color: var(--pitch);
}

.page-about .about-crumbs .crumbs__sep {
  margin: 0 8px;
  color: var(--haze);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding-top: 12px;
}

/* 章节目录 */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-toc {
  position: sticky;
  top: 108px;
  padding: 14px 16px;
  background: var(--glass);
  border: 1px solid var(--haze);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--moss);
}

.page-about .about-toc__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--moss);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-toc__link .mono {
  font-size: 11px;
  color: var(--pulse);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--paper);
  background: rgba(103, 255, 199, 0.1);
  border-color: rgba(103, 255, 199, 0.4);
  outline: none;
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--ink);
  background: var(--pitch);
  border-color: var(--pitch);
}

.page-about .about-toc__link[aria-current="true"] .mono {
  color: var(--ink);
}

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

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 26px 0 40px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -24px -12px 0 -12px;
  z-index: -1;
  background:
    radial-gradient(120% 100% at 88% 0%, rgba(103, 255, 199, 0.16), transparent 62%),
    linear-gradient(180deg, rgba(10, 33, 27, 0.85), rgba(8, 11, 10, 0) 88%);
  pointer-events: none;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(34px, 7.4vw, 82px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--moss);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__meta-item {
  position: relative;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--pitch);
}

.page-about .about-hero__meta-item + .about-hero__meta-item::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--amber);
  transform: translateY(-50%);
}

/* 章节通用 */
.page-about .about-section {
  padding: 52px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 6px 14px;
  margin-bottom: 28px;
}

.page-about .about-index {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--pitch);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-section__note {
  grid-column: 2;
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--moss);
}

/* 使命声明 */
.page-about .about-mission__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

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

.page-about .about-mission__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--moss);
}

.page-about .about-statement {
  margin: 0 0 20px;
  padding-left: 18px;
  border-left: 2px solid var(--pitch);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--paper);
}

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

.page-about .about-figure img,
.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--haze);
  object-fit: cover;
}

.page-about .about-figure .media__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--moss);
}

/* 服务对象 */
.page-about .about-audience {
  background: linear-gradient(180deg, rgba(10, 33, 27, 0.72), rgba(8, 11, 10, 0));
  margin-inline: calc(var(--gutter) * -1);
  padding-inline: var(--gutter);
}

.page-about .about-banner {
  position: relative;
  margin: 0 0 26px;
  overflow: hidden;
  border-radius: var(--radius);
}

.page-about .about-banner img {
  height: clamp(150px, 26vw, 260px);
  border: 0;
  filter: saturate(0.85) brightness(0.78);
}

.page-about .about-audience__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .audience-card {
  padding: 20px;
  background: rgba(10, 33, 27, 0.55);
  border: 1px solid var(--haze);
  border-radius: var(--radius);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .audience-card:hover {
  border-color: rgba(103, 255, 199, 0.5);
  transform: translateY(-3px);
}

.page-about .audience-card__role {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .audience-card__title {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .audience-card__lines {
  margin: 0;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 8px 10px;
  font-size: 13px;
  line-height: 1.7;
}

.page-about .audience-card__lines dt {
  color: var(--pitch);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding-top: 1px;
}

.page-about .audience-card__lines dd {
  margin: 0;
  color: var(--moss);
}

/* 能力矩阵：整块浅色，制造阅读节奏变化 */
.page-about .about-matrix {
  background: var(--paper);
  color: var(--ink);
  margin-inline: calc(var(--gutter) * -1);
  padding-inline: var(--gutter);
  border-bottom: 1px solid var(--haze);
}

.page-about .about-matrix .about-section__title {
  color: var(--ink);
}

.page-about .about-matrix .about-section__note {
  color: #4a6159;
}

.page-about .about-matrix__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .cap-card {
  position: relative;
  padding: 18px 18px 16px;
  background: #ffffff;
  border: 1px solid #d5e2da;
  border-radius: var(--radius);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .cap-card:hover,
.page-about .cap-card:focus-within {
  border-color: var(--pulse);
  transform: translateY(-4px);
  box-shadow: 0 14px 28px -18px rgba(10, 33, 27, 0.55);
  outline: none;
}

.page-about .cap-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  color: #0A211B;
  background: rgba(25, 201, 162, 0.16);
}

.page-about .cap-card__title {
  margin: 12px 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: #0A211B;
}

.page-about .cap-card__metric {
  margin: 0 0 8px;
  font-size: 30px;
  line-height: 1;
  color: #0A211B;
  letter-spacing: -0.02em;
}

.page-about .cap-card__metric span {
  margin-left: 6px;
  font-size: 12px;
  font-family: var(--font-body);
  font-weight: 500;
  color: #6b8079;
  letter-spacing: 0;
}

.page-about .cap-card__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: #3f5a51;
}

.page-about .cap-card__more {
  max-height: none;
  opacity: 1;
  overflow: hidden;
}

.page-about .cap-card__more p {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed #c9dbd2;
  font-size: 12.5px;
  line-height: 1.75;
  color: #5c7269;
}

/* 交付流程 */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  background: var(--haze);
  border: 1px solid var(--haze);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .step-card {
  padding: 20px 18px;
  background: var(--ink);
}

.page-about .step-card__no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .step-card__title {
  margin: 8px 0 8px;
  font-size: 16px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .step-card__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .about-delivery__figure img {
  height: clamp(180px, 30vw, 300px);
  object-fit: cover;
  filter: saturate(0.9) brightness(0.86);
}

/* 团队与生态 */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .about-team__roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .team-role {
  padding-left: 16px;
  border-left: 1px solid var(--haze);
}

.page-about .team-role__title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--pitch);
}

.page-about .team-role p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .about-eco {
  padding: 20px;
  background: var(--glass);
  border: 1px solid var(--haze);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
}

.page-about .about-eco__label {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .eco-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .eco-stat__num {
  flex: 0 0 auto;
  font-size: 30px;
  line-height: 1;
  color: var(--pitch);
}

.page-about .eco-stat__plus {
  margin-left: 2px;
  font-size: 13px;
  color: var(--moss);
}

.page-about .eco-stat__label {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--moss);
}

.page-about .about-eco__note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .about-eco__note a {
  color: var(--pitch);
  text-decoration: none;
  border-bottom: 1px solid rgba(103, 255, 199, 0.4);
}

.page-about .about-eco__note a:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* 阶段轴 */
.page-about .about-timeline__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.page-about .about-timeline__jump a {
  padding: 6px 12px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--amber);
  text-decoration: none;
  border: 1px solid rgba(255, 181, 74, 0.4);
  border-radius: 999px;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-timeline__jump a:hover,
.page-about .about-timeline__jump a:focus-visible {
  background: var(--amber);
  color: var(--ink);
  outline: none;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--pitch), rgba(46, 73, 64, 0.35));
}

.page-about .about-phase {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-phase::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--pitch);
  box-sizing: content-box;
}

.page-about .about-phase__badge {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-phase__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 19px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-phase__text {
  margin: 0;
  max-width: 62ch;
  font-size: 13px;
  line-height: 1.8;
  color: var(--moss);
}

/* 结尾行动 */
.page-about .about-cta {
  margin: 34px 0 10px;
  padding: 30px 22px;
  background:
    linear-gradient(135deg, rgba(103, 255, 199, 0.14), rgba(255, 181, 74, 0.08)),
    var(--turf);
  border: 1px solid rgba(103, 255, 199, 0.35);
  border-radius: var(--radius);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 3.6vw, 32px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 10px 0 20px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 平板 */
@media (min-width: 700px) {
  .page-about .about-mission__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: 32px;
  }

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

  .page-about .about-matrix__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

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

  .page-about .about-team__roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-toc__list {
    flex-wrap: wrap;
    overflow-x: visible;
  }
}

/* 桌面：左侧索引常驻，主区宽窄交替 */
@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
    padding-top: 20px;
  }

  .page-about .about-toc__list {
    display: block;
  }

  .page-about .about-toc__list li + li {
    margin-top: 2px;
  }

  .page-about .about-toc__link {
    border-radius: 8px;
    white-space: normal;
  }

  .page-about .about-hero {
    padding: 18px 0 52px;
  }

  .page-about .about-section {
    padding: 64px 0;
  }

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

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

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

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-timeline {
    padding-left: 30px;
  }
}

/* 有精确指针的环境才用悬停展开，触屏默认完整可读 */
@media (hover: hover) and (pointer: fine) {
  .page-about .cap-card__more {
    max-height: 0;
    opacity: 0;
    transition: max-height 0.35s var(--ease), opacity 0.28s var(--ease);
  }

  .page-about .cap-card:hover .cap-card__more,
  .page-about .cap-card:focus-within .cap-card__more,
  .page-about .cap-card:focus .cap-card__more {
    max-height: 220px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .audience-card,
  .page-about .cap-card,
  .page-about .cap-card__more,
  .page-about .about-toc__link {
    transition: none;
  }

  .page-about .audience-card:hover,
  .page-about .cap-card:hover,
  .page-about .cap-card:focus-within {
    transform: none;
  }
}