.page-about {
  --about-gap: clamp(26px, 5vw, 56px);
  --about-head-gap: clamp(16px, 2.6vw, 28px);
}

/* 面包屑 */
.page-about .about-crumb {
  padding-block: 16px 0;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(14px, 3vw, 30px);
  padding-bottom: var(--about-gap);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(46%, 300px);
  aspect-ratio: 1 / 1;
  background: var(--loess-500);
  opacity: 0.13;
  border-radius: 54% 46% 38% 62% / 48% 58% 42% 52%;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-h1 {
  margin: 14px 0 0;
  font-family: var(--font-narrow);
  font-weight: 900;
  font-size: clamp(2.55rem, 11.2vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -0.025em;
  color: var(--coal-900);
  max-width: 13ch;
}

.page-about .about-hero__intro {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--coal-600);
}

/* 首屏数据条 */
.page-about .about-statrow {
  margin-top: clamp(22px, 3.6vw, 34px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--border-sand);
  border: 1px solid var(--border-sand);
  border-radius: 14px 4px 24px 6px;
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--mist-white);
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.55rem, 5.6vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--coal-900);
}

.page-about .about-stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--coal-600);
}

/* 通用配图 */
.page-about .about-figure {
  margin: 0;
  border-radius: 18px 6px 30px 10px;
  overflow: hidden;
  background: var(--paper-200);
  box-shadow: var(--shadow-panel);
}

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

.page-about .about-figure .media-caption {
  display: block;
  padding: 10px 16px 12px;
  background: var(--paper-100);
  border-top: 1px solid var(--border-sand);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--coal-600);
}

.page-about .about-figure--hero {
  margin-top: clamp(20px, 3.4vw, 34px);
}

.page-about .about-figure--hero img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--steps img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--tall img {
  aspect-ratio: 5 / 6;
}

/* 章节通用 */
.page-about .about-section {
  padding-block: var(--about-gap);
}

.page-about .about-head {
  margin-bottom: var(--about-head-gap);
}

.page-about .about-head .eyebrow {
  display: block;
  margin: 0 0 10px;
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-narrow);
  font-weight: 900;
  font-size: clamp(1.75rem, 6.6vw, 3.1rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--coal-900);
  max-width: 16ch;
}

.page-about .about-lead {
  margin: 0 0 clamp(18px, 3vw, 26px);
  max-width: 34em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--coal-600);
}

/* 编辑部 */
.page-about .crew-bar {
  list-style: none;
  margin: 0 0 clamp(22px, 3.4vw, 32px);
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .crew-bar__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 6px 12px;
}

.page-about .crew-bar__label {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--coal-900);
}

.page-about .crew-bar__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14.5px;
  color: var(--loess-700);
}

.page-about .crew-bar__track {
  grid-column: 1 / -1;
  display: block;
  height: 10px;
  border-radius: 99px;
  background: var(--paper-200);
  overflow: hidden;
}

.page-about .crew-bar__fill {
  display: block;
  height: 100%;
  border-radius: 99px;
}

.page-about .crew-bar__fill--editor {
  width: 44.4%;
  background: var(--loess-500);
}

.page-about .crew-bar__fill--check {
  width: 33.3%;
  background: var(--line-teal);
}

.page-about .crew-bar__fill--design {
  width: 22.2%;
  background: var(--card-yellow);
}

.page-about .about-rhythm {
  border-left: 3px solid var(--loess-700);
  padding-left: 16px;
}

.page-about .about-rhythm__title {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--coal-900);
}

.page-about .about-rhythm__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-rhythm__list li {
  font-size: 15px;
  line-height: 1.75;
  color: var(--coal-600);
}

.page-about .about-rhythm__time {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--ink, var(--coal-900));
  background: var(--paper-200);
  border-radius: 4px 10px 4px 10px;
  padding: 2px 8px;
}

/* 四道工序 */
.page-about .about-steps {
  display: grid;
  gap: clamp(22px, 3.6vw, 36px);
}

.page-about .about-steps__media {
  align-self: start;
}

.page-about .step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .step-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 4px 14px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-sand);
}

.page-about .step-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .step-item__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--loess-700);
}

.page-about .step-item__title,
.page-about .step-item__body {
  grid-column: 2;
}

.page-about .step-item__title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--coal-900);
}

.page-about .step-item__body {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--coal-600);
  max-width: 34em;
}

/* 时间轴 */
.page-about .about-tl-wrap {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--loess-500) 0%, var(--line-teal) 72%, var(--loess-700) 100%);
}

.page-about .tl-item {
  position: relative;
  transition: transform 260ms ease-out;
}

.page-about .tl-item:hover,
.page-about .tl-item:focus-within {
  transform: translateX(4px);
}

.page-about .tl-mark {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper-100);
  border: 2px solid var(--loess-700);
  box-sizing: border-box;
  transition: background-color 260ms ease-out;
}

.page-about .tl-mark--teal {
  border-color: var(--line-teal);
}

.page-about .tl-item:hover .tl-mark,
.page-about .tl-item:focus-within .tl-mark {
  background: var(--card-yellow);
}

.page-about .tl-stage {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--coal-600);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--coal-900);
}

.page-about .tl-note {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--coal-600);
}

/* 数据源 */
.page-about .about-sources {
  color: var(--paper-100);
}

.page-about .about-sources .about-head__title,
.page-about .about-sources .about-src__num {
  color: var(--paper-100);
}

.page-about .about-sources .about-lead {
  color: rgba(247, 241, 228, 0.78);
}

.page-about .about-sources .about-head .eyebrow {
  color: var(--loess-500);
}

.page-about .about-src-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(247, 241, 228, 0.22);
  border: 1px solid rgba(247, 241, 228, 0.22);
  border-radius: 12px 4px 20px 6px;
  overflow: hidden;
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-about .about-src {
  background: #1D1916;
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-src__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.1rem, 8vw, 3rem);
  font-weight: 700;
  line-height: 1;
}

.page-about .about-src__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(247, 241, 228, 0.72);
}

.page-about .about-src-note {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 241, 228, 0.78);
}

.page-about .about-src-note a {
  color: var(--card-yellow);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-src-note a:hover,
.page-about .about-src-note a:focus-visible {
  color: var(--mist-white);
}

/* 内容标准 */
.page-about .value-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .value-item {
  background: var(--mist-white);
  border: 1px solid var(--border-sand);
  border-radius: 14px 4px 26px 6px;
  padding: 20px 20px 22px;
  box-shadow: 0 8px 20px rgba(20, 17, 15, 0.06);
  transition: box-shadow 260ms ease-out, transform 260ms ease-out;
}

.page-about .value-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .value-item .tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .value-item__title {
  margin: 0 0 8px;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--coal-900);
}

.page-about .value-item__body {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--coal-600);
}

/* 收尾 */
.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-narrow);
  font-weight: 900;
  font-size: clamp(1.6rem, 5.4vw, 2.4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--coal-900);
}

.page-about .about-cta__body {
  margin: 0 0 clamp(18px, 3vw, 26px);
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--coal-600);
}

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

/* 断点：平板 */
@media (min-width: 720px) {
  .page-about .about-statrow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .value-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

/* 断点：桌面 */
@media (min-width: 960px) {
  .page-about .about-steps {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-steps__media .about-figure {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-tl-wrap {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-tl-wrap .about-figure {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-hero::before {
    width: min(34%, 340px);
    top: -10px;
  }
}

/* 减少动效 */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .tl-mark,
  .page-about .value-item {
    transition: none;
  }

  .page-about .tl-item:hover,
  .page-about .tl-item:focus-within,
  .page-about .value-item:hover {
    transform: none;
  }
}