/* ===== 品牌概况页 ===== */

.page-about {
  --about-gap: clamp(18px, 3vw, 34px);
}

.page-about .breadcrumbs {
  padding-top: clamp(14px, 3vw, 24px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(22px, 4vw, 46px);
  padding-bottom: clamp(34px, 6vw, 76px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 5vw, 52px);
  align-items: center;
}

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

.page-about .about-hero__copy .eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(33px, 7.4vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 12px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .about-hero__facts .num {
  flex: 0 0 auto;
  min-width: 2.2em;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  overflow: hidden;
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(90deg, rgba(23, 224, 210, 0.09) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, rgba(23, 224, 210, 0.06) 0 1px, transparent 1px 56px);
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__caption {
  position: relative;
  z-index: 1;
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line);
  background: rgba(5, 18, 31, 0.82);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 能力清单 ---------- */

.page-about .about-scope__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-cap {
  border: 1px solid var(--line-soft);
  background: linear-gradient(155deg, rgba(20, 48, 79, 0.72), rgba(11, 30, 51, 0.34));
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .about-cap:hover,
.page-about .about-cap[open] {
  border-color: var(--line-strong);
}

.page-about .about-cap[open] {
  transform: translateX(2px);
}

.page-about .about-cap__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-cap__summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: -2px;
}

.page-about .about-cap__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .about-cap__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 24px);
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-cap__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .about-cap[open] .about-cap__summary::after {
  content: "\2013";
}

.page-about .about-cap__body {
  margin: 0 18px;
  padding: 14px 0 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-cap__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 版本时间轴 ---------- */

.page-about .about-timeline__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 44px);
  align-items: start;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-rock);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__list a {
  display: block;
  white-space: nowrap;
  padding: 10px 13px;
  border: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-cyan);
  border-color: var(--line-strong);
  transform: translateX(2px);
}

.page-about .about-timeline__track {
  position: relative;
}

.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan) 0%, rgba(23, 224, 210, 0.32) 58%, rgba(110, 122, 132, 0.22) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-left: 46px;
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .tl-item:last-child {
  margin-bottom: 0;
}

.page-about .tl-item__node {
  position: absolute;
  left: 0;
  top: 6px;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .tl-item--current .tl-item__node {
  border-color: rgba(255, 91, 46, 0.7);
  color: var(--c-orange);
}

.page-about .tl-item__card {
  border: 1px solid var(--line-soft);
  background: rgba(11, 30, 51, 0.55);
  padding: 16px 18px 18px;
  transition: border-color 0.25s ease;
}

.page-about .tl-item__card:hover {
  border-color: var(--line-strong);
}

.page-about .tl-item--current .tl-item__card {
  border-color: rgba(255, 91, 46, 0.42);
  background: linear-gradient(150deg, rgba(255, 91, 46, 0.10), rgba(11, 30, 51, 0.62));
}

.page-about .tl-item__head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.page-about .tl-item__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .tl-item__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 团队 ---------- */

.page-about .about-team__figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

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

.page-about .about-team__units li {
  padding-left: 16px;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-team__units-value {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  color: var(--c-cyan);
}

.page-about .about-team__units-value .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__units-name {
  margin: 6px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-team__units-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-team__visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

.page-about .team-ring {
  position: relative;
  width: min(238px, 66vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: conic-gradient(
    var(--c-cyan) 0deg 171deg,
    var(--c-moss) 171deg 288deg,
    var(--c-clay) 288deg 360deg
  );
}

.page-about .team-ring__hole {
  position: absolute;
  inset: 23%;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--c-deep);
  display: grid;
  place-items: center;
  text-align: center;
}

.page-about .team-ring__total {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .team-ring__unit {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-rock);
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
  max-width: 320px;
  display: grid;
  gap: 10px;
}

.page-about .team-legend li {
  display: grid;
  grid-template-columns: 12px 1fr auto;
  align-items: center;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--text-dim);
}

.page-about .team-legend .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.page-about .team-legend__swatch {
  width: 10px;
  height: 10px;
  display: block;
}

.page-about .team-legend__swatch--cyan { background: var(--c-cyan); }
.page-about .team-legend__swatch--moss { background: var(--c-moss); }
.page-about .team-legend__swatch--clay { background: var(--c-clay); }

/* ---------- 数据来源 ---------- */

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

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

.page-about .eco-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: baseline;
  gap: 4px 10px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .eco-item:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .eco-item:hover {
  border-color: var(--line-strong);
  transform: translateX(2px);
}

.page-about .eco-item__name {
  font-size: 15px;
  color: var(--text);
}

.page-about .eco-item__value {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .eco-item__unit {
  font-size: 13px;
  color: var(--c-rock);
}

.page-about .eco-item__note {
  grid-column: 1 / -1;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-dim);
}

.page-about .about-eco__figure {
  margin: 0;
}

/* ---------- 资质 ---------- */

.page-about .cred-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .cred {
  padding: 20px 18px 22px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--c-cyan);
  background: rgba(20, 48, 79, 0.42);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.page-about .cred:hover {
  border-color: var(--line-strong);
  background: rgba(20, 48, 79, 0.68);
}

.page-about .cred__value {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--c-orange);
}

.page-about .cred__value .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .cred__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .cred__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 覆盖与规模 ---------- */

.page-about .reach {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 42px);
  align-items: start;
}

.page-about .reach-scale {
  height: 42px;
  border: 1px solid var(--line);
  background-color: rgba(11, 30, 51, 0.6);
  background-image:
    repeating-linear-gradient(90deg, rgba(23, 224, 210, 0.85) 0 2px, transparent 2px 3.2258%),
    linear-gradient(180deg, rgba(20, 48, 79, 0.75), rgba(11, 30, 51, 0.35));
}

.page-about .reach-scale__caption {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .reach-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .reach-stats li {
  background: var(--bg-raised);
  padding: 16px 14px 18px;
  display: grid;
  gap: 6px;
}

.page-about .reach-stats__value {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .reach-stats__suffix {
  margin-left: 3px;
  font-size: 13px;
  font-weight: 400;
  color: var(--text-dim);
}

.page-about .reach-stats__label {
  font-size: 13px;
  color: var(--text-dim);
}

/* ---------- 起步入口 ---------- */

.page-about .start-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .start-item {
  display: grid;
  gap: 8px;
  padding: 20px 18px 22px;
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(20, 48, 79, 0.6), rgba(11, 30, 51, 0.32));
  text-decoration: none;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .start-item:hover,
.page-about .start-item:focus-visible {
  border-color: var(--line-strong);
  transform: translateX(2px);
}

.page-about .start-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .start-item__title {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .start-item__text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .start-item__go {
  margin-top: 4px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-amber);
}

.page-about .start-item--lead {
  border-color: rgba(23, 224, 210, 0.42);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-scope__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-cap--a { grid-column: span 7; }
  .page-about .about-cap--b { grid-column: span 5; }
  .page-about .about-cap--c { grid-column: span 5; }
  .page-about .about-cap--d { grid-column: span 7; }

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

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

  .page-about .start-item--lead {
    grid-column: span 2;
  }

  .page-about .start-item--wide {
    grid-column: span 2;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.04fr 1fr;
  }

  .page-about .about-hero__figure {
    transform: perspective(1100px) rotateY(-4deg) rotateX(1.5deg);
  }

  .page-about .about-timeline__layout {
    grid-template-columns: 3fr 9fr;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
  }

  .page-about .about-index__list {
    display: grid;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list a {
    padding: 10px 12px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-eco__grid {
    grid-template-columns: 6fr 6fr;
  }

  .page-about .reach {
    grid-template-columns: 5fr 7fr;
    align-items: center;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__grid {
    gap: 64px;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: 2.6fr 9.4fr;
    gap: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cap,
  .page-about .about-index__list a,
  .page-about .tl-item__card,
  .page-about .eco-item,
  .page-about .cred,
  .page-about .start-item {
    transition: none;
  }

  .page-about .about-cap[open],
  .page-about .start-item:hover,
  .page-about .eco-item:hover {
    transform: none;
  }

  .page-about .about-hero__figure {
    transform: none;
  }
}