.page-about {
  --about-gap: clamp(20px, 3.5vw, 44px);
  --about-body-text: rgba(246, 247, 249, 0.76);
  display: block;
  color: var(--titanium);
  overflow-wrap: break-word;
}

.page-about a:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(20px, 3vw, 34px);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(24px, 4vw, 46px) 0 clamp(46px, 7vw, 92px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -200px;
  right: -140px;
  width: min(460px, 70vw);
  height: min(460px, 70vw);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 106, 43, 0.18), transparent 68%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: end;
}

.page-about .about-hero__h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.6vw, 90px);
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--titanium);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--about-body-text);
}

.page-about .about-hero__side {
  padding-top: 22px;
  border-top: 1px solid var(--line-mid);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

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

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--signal);
}

.page-about .about-fact__label {
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-hero__note {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--ink-500);
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-hero__note a {
  color: var(--signal-soft);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 76px);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-band--cream {
  background: var(--cream);
  color: var(--brown);
}

.page-about .about-band--titanium {
  background: var(--titanium);
  color: var(--brown);
}

.page-about .about-band--cream .sec-head__title,
.page-about .about-band--titanium .sec-head__title {
  color: var(--brown);
}

.page-about .about-band--cream .sec-head__num,
.page-about .about-band--titanium .sec-head__num {
  color: var(--ink-500);
}

.page-about .about-band--cream a,
.page-about .about-band--titanium a {
  color: var(--ink-700);
}

.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-md);
}

/* ---------- 01 团队构成 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(24px, 3.5vw, 42px);
}

.page-about .about-team__media img {
  border: 1px solid var(--line-soft);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-role {
  position: relative;
  padding: 20px 18px 20px 22px;
  border-left: 2px solid var(--ink-500);
  background: linear-gradient(90deg, rgba(36, 64, 110, 0.28), transparent 72%);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  transition: border-color var(--dur) var(--ease),
    background var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-left-color: var(--signal);
  background: linear-gradient(90deg, rgba(255, 106, 43, 0.14), transparent 76%);
  transform: translateY(-2px);
}

.page-about .about-role__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.page-about .about-role__name {
  flex: 1 1 auto;
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--titanium);
}

.page-about .about-role__count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border: 1px solid var(--line-mid);
  border-radius: var(--r-pill);
  color: var(--slate);
}

.page-about .about-role__desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--slate);
}

@media (min-width: 940px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

/* ---------- 02 通道体系 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 46px);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-aside {
  border-left: 3px solid var(--signal);
  padding: 4px 0 4px 18px;
}

.page-about .about-aside__key {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink-700);
}

.page-about .about-aside__text {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: 17px;
  line-height: 1.7;
  color: var(--brown);
}

.page-about .about-origin__body {
  display: grid;
  gap: 18px;
}

.page-about .about-origin__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--brown);
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }
}

/* ---------- 03 发展阶段 ---------- */
.page-about .about-phases__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(24px, 3.5vw, 42px);
}

.page-about .about-axis {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 6px 0 6px 26px;
  display: grid;
  gap: 24px;
  align-content: start;
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--signal) 0%, var(--ink-500) 58%, rgba(36, 64, 110, 0.25) 100%);
}

.page-about .about-axis__item {
  position: relative;
  display: grid;
  gap: 3px;
}

.page-about .about-axis__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--ink-500);
  transition: background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .about-axis__item:hover::before,
.page-about .about-axis__item:focus-within::before {
  background: var(--signal);
  border-color: var(--signal);
  box-shadow: 0 0 0 5px rgba(255, 106, 43, 0.16);
}

.page-about .about-axis__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--slate);
}

.page-about .about-axis__label {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--titanium);
}

.page-about .about-phases__media {
  margin: 0 0 clamp(22px, 3vw, 34px);
}

.page-about .about-phases__media img {
  border: 1px solid var(--line-soft);
}

.page-about .about-phases {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-phase {
  padding: 26px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-phase__tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--signal-soft);
}

.page-about .about-phase__name {
  margin: 0 0 10px;
  font-family: var(--font-editorial);
  font-size: clamp(20px, 2.3vw, 26px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--titanium);
}

.page-about .about-phase__body {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body-text);
}

.page-about .about-phase__result {
  margin: 14px 0 0;
  padding-left: 15px;
  border-left: 2px solid var(--mint);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mint);
}

@media (min-width: 960px) {
  .page-about .about-phases__layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .about-axis {
    position: sticky;
    top: 40px;
  }
}

/* ---------- 04 服务覆盖 ---------- */
.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(24px, 3.5vw, 42px);
}

.page-about .about-reach__media img {
  border: 1px solid rgba(36, 28, 22, 0.1);
}

.page-about .about-reach__stats {
  display: grid;
  align-content: start;
}

.page-about .about-stat {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  gap: 6px 22px;
  align-items: start;
  padding: 22px 0;
  border-bottom: 1px solid rgba(36, 28, 22, 0.14);
}

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

.page-about .about-stat:last-child {
  border-bottom: 0;
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--ink-900);
}

.page-about .about-stat__meta {
  display: grid;
  gap: 8px;
}

.page-about .about-stat__unit {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ink-500);
}

.page-about .about-stat__desc {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--brown);
}

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

/* ---------- 05 质量保障 ---------- */
.page-about .about-quality__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(24px, 3.5vw, 42px);
}

.page-about .about-quality__item {
  background: var(--ink-700);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  padding: clamp(22px, 2.6vw, 32px);
  transition: border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .about-quality__item:hover,
.page-about .about-quality__item:focus-within {
  border-color: var(--ink-500);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.page-about .about-quality__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin: 0 0 16px;
  border-radius: 50%;
  background: var(--signal);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .about-quality__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--titanium);
}

.page-about .about-quality__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--about-body-text);
}

@media (min-width: 900px) {
  .page-about .about-quality__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-quality__item:nth-child(1) {
    grid-column: 1 / span 6;
    grid-row: 1;
  }

  .page-about .about-quality__item:nth-child(2) {
    grid-column: 8 / span 5;
    grid-row: 1;
    margin-top: 46px;
  }

  .page-about .about-quality__item:nth-child(3) {
    grid-column: 2 / span 9;
    grid-row: 2;
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: clamp(40px, 6vw, 78px);
  padding: clamp(38px, 6vw, 74px) 0 clamp(44px, 6vw, 82px);
  background: linear-gradient(135deg, var(--ink-700) 0%, var(--ink-900) 72%);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  left: -60px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(31, 185, 138, 0.14), transparent 70%);
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  display: grid;
  gap: 14px;
  max-width: 720px;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--titanium);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-body-text);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}