.page-about {
  --about-rail-w: 210px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  padding-bottom: 0;
}

.page-about .breadcrumbs {
  margin-top: clamp(12px, 2vw, 20px);
}

/* ---------- 首屏 ---------- */
.page-about .about-lede {
  padding-block: clamp(22px, 4vw, 44px) clamp(20px, 3.5vw, 36px);
  border-bottom: 2px solid var(--line);
}

.page-about .about-lede__tick {
  display: block;
  color: var(--mint);
  letter-spacing: 0.2em;
  margin-bottom: 14px;
}

.page-about .about-lede__title {
  font-size: clamp(1.95rem, 7vw, 4.2rem);
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: -0.015em;
  margin: 0 0 clamp(18px, 3vw, 28px);
  color: var(--paper);
}

.page-about .about-lede__body p {
  margin: 0 0 12px;
  color: var(--stone);
  line-height: 1.68;
  font-size: clamp(0.95rem, 1.6vw, 1.02rem);
}

.page-about .about-lede__body p:first-child {
  color: var(--paper);
}

.page-about .about-lede__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-lede__stats {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 18px 0 0;
  border-top: 2px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-left: 2px solid var(--mint-deep);
  padding-left: 10px;
}

.page-about .about-stat__value {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.7rem, 4.4vw, 2.6rem);
  line-height: 1;
  color: var(--mint);
  letter-spacing: -0.02em;
}

.page-about .about-stat__unit {
  font-size: 0.5em;
  margin-left: 2px;
}

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

@media (min-width: 760px) {
  .page-about .about-lede__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-lede {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    grid-template-areas:
      "tick body"
      "title body"
      "stats stats";
    column-gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }
  .page-about .about-lede__tick { grid-area: tick; }
  .page-about .about-lede__title { grid-area: title; margin-bottom: 0; }
  .page-about .about-lede__body { grid-area: body; border-left: 2px solid var(--line); padding-left: clamp(18px, 2.4vw, 32px); }
  .page-about .about-lede__stats { grid-area: stats; }
}

/* ---------- 主体骨架：左索引 + 右叙事 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-block: clamp(8px, 2vw, 16px) clamp(28px, 5vw, 56px);
}

.page-about .about-rail {
  padding: 18px 0 clamp(18px, 3vw, 26px);
  border-bottom: 2px solid var(--line);
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--mint);
  text-transform: uppercase;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 11px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.82rem;
  white-space: nowrap;
  transition: border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.page-about .about-rail__list a:hover {
  border-color: var(--mint);
  color: var(--mint);
  transform: translateY(-2px);
}

.page-about .about-rail__list a:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

.page-about .about-rail__num {
  font-family: var(--font-num);
  font-size: 0.72rem;
  color: var(--amber);
}

.page-about .about-rail__note {
  display: none;
  margin: 16px 0 0;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--stone);
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 64px);
  }
  .page-about .about-rail {
    position: sticky;
    top: 20px;
    align-self: start;
    border-bottom: 0;
    border-left: 2px solid var(--line);
    padding: 8px 0 0 16px;
  }
  .page-about .about-rail__list {
    display: block;
    overflow: visible;
  }
  .page-about .about-rail__list li + li {
    margin-top: 4px;
  }
  .page-about .about-rail__list a {
    display: flex;
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    padding: 9px 8px 9px 10px;
  }
  .page-about .about-rail__list a:hover {
    transform: translateX(3px);
    border-left-color: var(--mint);
  }
  .page-about .about-rail__note {
    display: block;
  }
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(26px, 4.5vw, 52px);
  border-top: 2px solid var(--line);
}

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

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  align-items: baseline;
  margin-bottom: 16px;
}

.page-about .about-chapter__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--mint);
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(1.4rem, 3.6vw, 2.3rem);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-chapter__note {
  grid-column: 2;
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--stone);
}

.page-about .about-chapter__text p {
  margin: 0 0 12px;
  line-height: 1.7;
  color: var(--stone);
  font-size: clamp(0.94rem, 1.5vw, 1rem);
}

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

.page-about .about-chapter__text--spaced {
  margin-top: clamp(18px, 3vw, 28px);
  padding-top: clamp(16px, 3vw, 24px);
  border-top: 2px dashed var(--line);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(20px, 3.5vw, 32px) 0 0;
  padding: 0 0 0 20px;
  border-left: 2px solid var(--line);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 28px) 18px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 4px;
  width: 12px;
  height: 12px;
  background: var(--ink);
  border: 2px solid var(--mint);
  border-radius: 50%;
  transition: background 0.18s ease, transform 0.18s ease;
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  background: var(--mint);
  transform: scale(1.25);
}

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

.page-about .timeline__title {
  margin: 10px 0 6px;
  font-size: clamp(1.02rem, 2vw, 1.16rem);
  font-weight: 700;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 0;
  color: var(--stone);
  line-height: 1.65;
  font-size: 0.92rem;
}

/* ---------- 班组抽屉 ---------- */
.page-about .drawers {
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .drawer {
  border: 2px solid var(--line);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
}

.page-about .drawer + .drawer {
  margin-top: 12px;
}

.page-about .drawer__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  color: var(--paper);
  transition: color 0.15s ease, background 0.15s ease;
}

.page-about .drawer__summary::-webkit-details-marker {
  display: none;
}

.page-about .drawer__summary:hover {
  color: var(--mint);
}

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

.page-about .drawer[open] .drawer__summary {
  color: var(--mint);
  border-bottom: 2px solid var(--line);
}

.page-about .drawer__count {
  font-family: var(--font-num);
  font-size: 0.85rem;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .drawer__body {
  padding: 14px 16px 18px;
}

.page-about .drawer__body p {
  margin: 0 0 10px;
  color: var(--stone);
  line-height: 1.68;
  font-size: 0.93rem;
}

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

.page-about .drawer__list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.88rem;
  color: var(--paper);
  line-height: 1.6;
}

.page-about .drawer__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 2px;
  background: var(--mint-deep);
}

/* ---------- 图片画框 ---------- */
.page-about .media-frame {
  margin: clamp(20px, 3.5vw, 32px) 0 0;
}

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

.page-about .media-frame__caption {
  margin-top: 8px;
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--stone);
}

/* ---------- 覆盖点阵 ---------- */
.page-about .region-field {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 7px;
  margin-top: clamp(16px, 3vw, 24px);
  padding: clamp(14px, 2.5vw, 20px);
  border: 2px solid var(--line);
  background: var(--ink-2);
}

.page-about .region-field span {
  aspect-ratio: 1 / 1;
  background: var(--mint-deep);
  border-radius: 1px;
  opacity: 0.75;
}

.page-about .region-field span:nth-child(4n) {
  background: var(--moss);
  opacity: 0.9;
}

.page-about .region-field span:nth-child(7n) {
  background: var(--mint);
  opacity: 0.85;
}

@media (min-width: 720px) {
  .page-about .region-field {
    grid-template-columns: repeat(16, minmax(0, 1fr));
    gap: 9px;
  }
}

.page-about .client-types {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .client-types__item {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 12px 14px;
  border: 2px solid var(--line);
  border-left: 4px solid var(--clay);
  background: var(--ink-2);
}

.page-about .client-types__item strong {
  font-size: 0.94rem;
  color: var(--paper);
}

.page-about .client-types__item span {
  font-size: 0.86rem;
  line-height: 1.62;
  color: var(--stone);
}

@media (min-width: 700px) {
  .page-about .client-types {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 赛季节奏 ---------- */
.page-about .cadence {
  display: grid;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .cadence__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num label"
    "num text";
  column-gap: 14px;
  row-gap: 2px;
  padding: 14px 16px;
  border: 2px solid var(--line);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
}

.page-about .cadence__num {
  grid-area: num;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.6vw, 2rem);
  color: var(--mint);
  line-height: 1;
  align-self: center;
}

.page-about .cadence__label {
  grid-area: label;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .cadence__item p {
  grid-area: text;
  margin: 4px 0 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--stone);
}

@media (min-width: 760px) {
  .page-about .cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .cadence__item {
    grid-template-areas:
      "num"
      "label"
      "text";
    grid-template-columns: minmax(0, 1fr);
    row-gap: 6px;
  }
}

/* ---------- 客户成功（浅色块） ---------- */
.page-about .about-chapter--paper {
  background: var(--paper);
  color: var(--ink);
  border-top: 2px solid var(--ink);
  padding: clamp(18px, 3.5vw, 34px);
  box-shadow: var(--shadow-hard);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-chapter--paper .about-chapter__num {
  color: var(--mint-deep);
}

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

.page-about .about-chapter--paper .about-chapter__note {
  color: var(--clay);
}

.page-about .about-chapter--paper .about-chapter__text p {
  color: #2b3a48;
}

.page-about .steps {
  list-style: none;
  margin: clamp(16px, 3vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: step;
}

.page-about .steps__item {
  position: relative;
  padding: 12px 14px 14px;
  background: var(--ink);
  color: var(--paper);
  border-left: 4px solid var(--mint);
}

.page-about .steps__num {
  font-family: var(--font-num);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .steps__title {
  margin: 4px 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .steps__text {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.65;
  color: var(--stone);
}

@media (min-width: 760px) {
  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .steps__item:last-child {
    grid-column: 1 / -1;
  }
}

.page-about .about-service__foot {
  margin-top: clamp(18px, 3vw, 26px);
  padding-top: clamp(14px, 2.5vw, 20px);
  border-top: 2px solid var(--ink);
}

.page-about .about-service__foot p {
  margin: 0 0 12px;
  font-size: 0.9rem;
  line-height: 1.68;
  color: #2b3a48;
}

.page-about .about-service__foot strong {
  color: var(--mint-deep);
}

.page-about .about-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-contact .copy-btn {
  border: 2px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-family: var(--font-num);
  font-size: 0.8rem;
  padding: 8px 12px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.page-about .about-contact .copy-btn:hover,
.page-about .about-contact .copy-btn:focus-visible {
  background: var(--ink);
  color: var(--mint);
  outline: none;
}

.page-about .about-service__hint {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--clay);
}

/* ---------- 尾部引导 ---------- */
.page-about .about-cta {
  padding-block: clamp(30px, 5vw, 60px);
  border-top: 2px solid var(--line);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(1.35rem, 3.6vw, 2.1rem);
  line-height: 1.16;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 46ch;
  color: var(--stone);
  line-height: 1.68;
  font-size: 0.95rem;
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .timeline__item::before,
  .page-about .drawer__summary,
  .page-about .about-contact .copy-btn {
    transition: none;
  }
  .page-about .about-rail__list a:hover,
  .page-about .timeline__item:hover::before {
    transform: none;
  }
}