/* ===== 品牌文化 · page-about ===== */
.page-about {
  --about-gap: clamp(20px, 3vw, 44px);
  --about-line: 1px solid rgba(140, 154, 147, 0.22);
  --about-line-strong: 1px solid rgba(140, 154, 147, 0.45);

  background: var(--c-base);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: var(--step-body);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.page-about .shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  box-sizing: border-box;
}

.page-about .about-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, 0.42);
  padding-bottom: 1px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

.page-about .about-note {
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  font-size: var(--step-note);
  line-height: 1.7;
  color: var(--c-rock);
  max-width: 78ch;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(96px, 13vw, 168px) clamp(28px, 4vw, 52px);
  border-bottom: var(--about-line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(140, 154, 147, 0.075) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 154, 147, 0.075) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 90% at 18% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 90% at 18% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: var(--pad-x);
  right: var(--pad-x);
  top: clamp(74px, 10vw, 122px);
  height: 1px;
  background: linear-gradient(90deg, var(--c-cyan), rgba(53, 224, 208, 0));
  opacity: 0.5;
  pointer-events: none;
}

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

.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--step-note);
  color: var(--c-rock);
  letter-spacing: 0.06em;
  margin-bottom: clamp(20px, 3vw, 34px);
}
.page-about .breadcrumbs a {
  color: var(--c-rock);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--c-cyan);
}
.page-about .breadcrumbs__sep {
  color: rgba(140, 154, 147, 0.5);
}
.page-about .breadcrumbs__item {
  color: var(--c-ink);
}

.page-about .section__eyebrow {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-family: var(--font-num);
  font-size: var(--step-note);
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--step-h1);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin: clamp(20px, 2.6vw, 32px) 0 0;
  max-width: 62ch;
  color: var(--c-ink);
  opacity: 0.92;
}
.page-about .about-hero__lede--soft {
  margin-top: 12px;
  color: var(--c-rock);
  opacity: 1;
  font-size: calc(var(--step-body) * 0.96);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 28px) var(--grid-gap);
  margin: clamp(32px, 4.6vw, 56px) 0 0;
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: var(--about-line);
}

.page-about .about-stat__value {
  margin: 0;
  display: block;
  font-family: var(--font-num);
  font-size: clamp(30px, 3.6vw, 50px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-cyan);
}
.page-about .about-stat__value--amber {
  color: var(--c-orange);
}
.page-about .about-stat__label {
  display: block;
  order: -1;
  margin-bottom: 8px;
  font-size: var(--step-note);
  letter-spacing: 0.1em;
  color: var(--c-rock);
}

/* ---------- 通用分节 ---------- */
.page-about .about-section {
  padding-block: clamp(44px, 6.4vw, 92px);
  border-bottom: var(--about-line);
}
.page-about .about-section--seam {
  background: var(--c-seam);
}
.page-about .about-section--method {
  background: linear-gradient(180deg, var(--c-base) 0%, var(--c-panel) 100%);
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 3.2vw, 42px);
}
.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--step-h2);
  line-height: 1.16;
  letter-spacing: -0.015em;
  max-width: 26ch;
}
.page-about .about-head__title--solo {
  margin-bottom: clamp(24px, 3.2vw, 42px);
}
.page-about .about-head__note {
  margin: 0;
  font-size: var(--step-note);
  line-height: 1.7;
  color: var(--c-rock);
  max-width: 46ch;
}

/* ---------- 章节一：起点 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-body p {
  margin: 0 0 1em;
  max-width: 64ch;
}
.page-about .about-body p:last-child {
  margin-bottom: 0;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 0;
  border-top: var(--about-line);
}
.page-about .about-facts__item {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: var(--about-line);
}
.page-about .about-facts__k {
  flex: 0 0 auto;
  min-width: 84px;
  font-family: var(--font-num);
  font-size: var(--step-note);
  letter-spacing: 0.1em;
  color: var(--c-amber);
}
.page-about .about-facts__v {
  color: var(--c-ink);
  opacity: 0.9;
}

.page-about .about-figure {
  margin: 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--about-line);
  filter: saturate(0.82) contrast(1.06);
  background: var(--c-panel);
}
.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: var(--step-note);
  line-height: 1.65;
  color: var(--c-rock);
}
.page-about .about-figure--band {
  margin-bottom: clamp(22px, 3vw, 36px);
}
.page-about .about-figure--flow {
  margin-top: clamp(26px, 3.4vw, 44px);
}

/* ---------- 章节二：团队 ---------- */
.page-about .crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--grid-gap);
}

.page-about .role {
  position: relative;
  background: var(--c-panel);
  padding: clamp(16px, 2.1vw, 28px);
  outline: none;
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}
.page-about .role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: var(--c-rock);
  opacity: 0.45;
}
.page-about .role--accent::before {
  background: var(--c-cyan);
  opacity: 1;
}
.page-about .role:hover,
.page-about .role:focus-visible {
  background: #143428;
  transform: translateY(-4px);
}

.page-about .role__count {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(42px, 5.2vw, 82px);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--c-cyan);
}
.page-about .role__count--amber {
  color: var(--c-orange);
}
.page-about .role__name {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-size: var(--step-h3);
  font-weight: 700;
  letter-spacing: 0.01em;
}
.page-about .role__desc {
  margin: 0;
  font-size: calc(var(--step-body) * 0.94);
  color: var(--c-rock);
}

/* ---------- 章节三：流程 ---------- */
.page-about .steps {
  border-top: var(--about-line-strong);
}
.page-about .step {
  border-bottom: var(--about-line);
}
.page-about .step__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 16px;
  padding: clamp(14px, 2vw, 22px) 0;
  cursor: pointer;
  list-style: none;
}
.page-about .step__summary::-webkit-details-marker {
  display: none;
}
.page-about .step__summary:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: -1px;
}
.page-about .step__num {
  font-family: var(--font-num);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--c-amber);
}
.page-about .step__title {
  font-family: var(--font-head);
  font-size: var(--step-h3);
  font-weight: 700;
  transition: color 0.25s var(--ease);
}
.page-about .step__hint {
  grid-column: 2;
  font-size: var(--step-note);
  color: var(--c-rock);
}
.page-about .step[open] .step__title {
  color: var(--c-cyan);
}
.page-about .step__body {
  padding-bottom: clamp(18px, 2.4vw, 28px);
  max-width: 66ch;
}
.page-about .step__body p {
  margin: 0 0 0.7em;
  color: var(--c-ink);
  opacity: 0.9;
}
.page-about .step__meta {
  font-size: var(--step-note);
  letter-spacing: 0.04em;
  color: var(--c-rock);
  opacity: 1 !important;
}

/* ---------- 章节四：里程碑 ---------- */
.page-about .about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(20px, 2.6vw, 32px);
}
.page-about .about-chip {
  appearance: none;
  background: transparent;
  border: 1px solid rgba(140, 154, 147, 0.38);
  color: var(--c-rock);
  font-family: var(--font-body);
  font-size: var(--step-note);
  letter-spacing: 0.08em;
  padding: 8px 16px;
  cursor: pointer;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.page-about .about-chip:hover,
.page-about .about-chip:focus-visible,
.page-about .about-chip[aria-pressed="true"] {
  color: var(--c-base);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-line);
}
.page-about .tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-block: clamp(16px, 2.2vw, 26px);
  border-bottom: var(--about-line);
}
.page-about .tl-year {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(20px, 2.1vw, 28px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--c-ink);
}
.page-about .tl-year span {
  display: block;
  margin-top: 6px;
  font-family: var(--font-body);
  font-size: var(--step-note);
  letter-spacing: 0.12em;
  color: var(--c-rock);
}
.page-about .tl-body {
  border-left: 2px solid var(--c-amber);
  padding-left: clamp(14px, 1.6vw, 20px);
}
.page-about .tl-item[data-switch-key="product"] .tl-body {
  border-left-color: var(--c-cyan);
}
.page-about .tl-title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: var(--step-h3);
  font-weight: 700;
}
.page-about .tl-text {
  margin: 0;
  max-width: 62ch;
  color: var(--c-rock);
  font-size: calc(var(--step-body) * 0.96);
}

/* ---------- 章节五：合作生态 ---------- */
.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}
.page-about .eco__intro p {
  margin: 0;
  max-width: 56ch;
  color: var(--c-ink);
  opacity: 0.9;
}
.page-about .eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-line-strong);
}
.page-about .eco-list__item {
  padding: clamp(16px, 2vw, 24px) 0;
  border-bottom: var(--about-line);
}
.page-about .eco-list__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: var(--step-h3);
  font-weight: 700;
  color: var(--c-cyan);
}
.page-about .eco-list__text {
  margin: 0;
  max-width: 58ch;
  color: var(--c-rock);
  font-size: calc(var(--step-body) * 0.96);
}

/* ---------- 章节六：工作方式 ---------- */
.page-about .method {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.4vw, 30px);
}
.page-about .method__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 18px;
  align-items: start;
  padding-top: clamp(14px, 1.8vw, 20px);
  border-top: 2px solid var(--c-clay);
}
.page-about .method__num {
  font-family: var(--font-num);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--c-clay);
}
.page-about .method__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: var(--step-h3);
  font-weight: 700;
}
.page-about .method__body p {
  margin: 0;
  color: var(--c-rock);
  font-size: calc(var(--step-body) * 0.96);
}

/* ---------- 章节七：年鉴与参与 ---------- */
.page-about .reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--grid-gap);
}
.page-about .reach__card {
  padding: clamp(18px, 2.2vw, 28px) 0 0;
  border-top: 3px solid var(--c-rock);
}
.page-about .reach__card--amber {
  border-top-color: var(--c-amber);
}
.page-about .reach__card--cyan {
  border-top-color: var(--c-cyan);
}
.page-about .reach__value {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: clamp(30px, 3.4vw, 48px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-ink);
}
.page-about .reach__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: var(--step-h3);
  font-weight: 700;
}
.page-about .reach__text {
  margin: 0;
  color: var(--c-rock);
  font-size: calc(var(--step-body) * 0.94);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding-block: clamp(40px, 6vw, 84px);
}
.page-about .about-cta__box {
  position: relative;
  background: var(--c-panel);
  padding: clamp(24px, 4vw, 56px);
  border-left: 3px solid var(--c-orange);
  overflow: hidden;
}
.page-about .about-cta__box::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(53, 224, 208, 0.16), transparent 68%);
  pointer-events: none;
}
.page-about .about-cta__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: var(--step-note);
  letter-spacing: 0.18em;
  color: var(--c-orange);
}
.page-about .about-cta__title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: var(--step-h2);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.015em;
  max-width: 22ch;
}
.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  color: var(--c-rock);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .reach {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .method {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
  .page-about .about-split__aside {
    margin-top: clamp(8px, 1.4vw, 18px);
  }
  .page-about .crew {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .role--wide {
    grid-column: span 4;
  }
  .page-about .role--narrow {
    grid-column: span 2;
  }
  .page-about .step__body {
    padding-left: 56px;
  }
  .page-about .tl-item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 32px;
  }
  .page-about .tl-year {
    position: sticky;
    top: 104px;
    align-self: start;
  }
  .page-about .eco {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
  .page-about .reach {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .method {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    align-items: end;
    gap: 40px;
  }
  .page-about .about-head__note {
    justify-self: end;
    text-align: right;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role,
  .page-about .about-chip,
  .page-about .step__title {
    transition: none;
  }
}