/* ===== 品牌历程页 ===== */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 22px 0 10px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -60px 0 auto;
  height: 340px;
  background:
    radial-gradient(620px 300px at 10% 0%, rgba(47, 224, 208, 0.12), transparent 62%),
    radial-gradient(520px 280px at 86% 14%, rgba(255, 107, 44, 0.09), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero > .wrap {
  position: relative;
}

.page-about .about-hero__inner {
  max-width: 46rem;
  padding: 20px 0 28px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4.6vw, 2.9rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.022em;
  color: var(--text-primary);
}

.page-about .about-hero .lede {
  margin: 16px 0 0;
  max-width: 44rem;
}

/* 头部视觉带 */
.page-about .about-band {
  position: relative;
  margin: 0;
  background: #0C1626;
  border-top: 1px solid var(--border-line);
  border-bottom: 1px solid var(--border-line);
}

.page-about .about-band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-band__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 22px 18px 12px;
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
  background: linear-gradient(to top, rgba(10, 20, 34, 0.94), rgba(10, 20, 34, 0));
}

/* 起点 */
.page-about .about-origin {
  max-width: 44rem;
}

.page-about .about-origin__h {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(1.28rem, 2.6vw, 1.7rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.page-about .about-origin p {
  margin: 0 0 14px;
  font-size: 0.95rem;
  line-height: 1.62;
  color: var(--text-secondary);
}

.page-about .about-origin p:first-of-type {
  color: var(--text-primary);
  font-size: 1rem;
}

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

/* 版本时间轴 */
.page-about .vtl {
  position: relative;
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .vtl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(to bottom,
    rgba(29, 52, 80, 0) 0%,
    var(--border-line) 6%,
    var(--border-line) 94%,
    rgba(29, 52, 80, 0) 100%);
}

.page-about .vtl__item {
  position: relative;
  padding: 0 0 12px 32px;
}

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

.page-about .vtl__node {
  position: absolute;
  left: 0;
  top: 20px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--border-line);
  background: var(--base-ink);
  box-shadow: 0 0 0 4px var(--base-ink);
  transition:
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-about .vtl__item:hover .vtl__node {
  border-color: var(--accent-cyan);
  transform: scale(1.18);
}

.page-about .vtl__node--current {
  border-color: var(--accent-orange);
  border-width: 2px;
  background: rgba(255, 107, 44, 0.22);
}

.page-about .vtl__item--current:hover .vtl__node {
  border-color: var(--accent-orange);
}

/* 版本卡片 */
.page-about .ver {
  background: var(--panel-navy);
  border: 1px solid var(--border-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ver:hover {
  border-color: #274469;
}

.page-about .ver--current {
  border-color: rgba(255, 107, 44, 0.42);
}

.page-about .ver[open] {
  border-color: #2C4E78;
}

.page-about .ver--current[open] {
  border-color: rgba(255, 107, 44, 0.62);
}

.page-about .ver__sum {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr) 1.1rem;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  -webkit-user-select: none;
  user-select: none;
  transition: background var(--dur) var(--ease);
}

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

.page-about .ver__sum:hover {
  background: rgba(76, 141, 255, 0.07);
}

.page-about .ver__idx {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  transition: color var(--dur) var(--ease);
}

.page-about .ver[open] .ver__idx {
  color: var(--accent-orange);
}

.page-about .ver__title {
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.008em;
  color: var(--text-primary);
}

.page-about .ver__toggle {
  position: relative;
  width: 11px;
  height: 11px;
  justify-self: end;
}

.page-about .ver__toggle::before,
.page-about .ver__toggle::after {
  content: "";
  position: absolute;
  background: var(--text-secondary);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ver__toggle::before {
  left: 0;
  top: 5px;
  width: 11px;
  height: 1px;
}

.page-about .ver__toggle::after {
  left: 5px;
  top: 0;
  width: 1px;
  height: 11px;
}

.page-about .ver[open] .ver__toggle::after {
  transform: scaleY(0);
}

.page-about .ver[open] .ver__toggle::before {
  background: var(--accent-orange);
}

.page-about .ver__body {
  padding: 12px 16px 16px;
  border-top: 1px solid var(--border-line);
}

.page-about .ver__pain {
  margin: 0 0 10px;
  font-size: 0.8rem;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--accent-cyan);
}

.page-about .ver__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ver__list li {
  position: relative;
  padding-left: 15px;
  font-size: 0.87rem;
  line-height: 1.58;
  color: var(--text-secondary);
}

.page-about .ver__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #35547C;
}

/* 资料库统计带 */
.page-about .about-stats {
  margin: 10px 0;
  padding: 36px 0 32px;
  background: linear-gradient(180deg, rgba(16, 31, 51, 0.92), rgba(10, 20, 34, 0.92));
  border-top: 1px solid var(--border-line);
  border-bottom: 1px solid var(--border-line);
}

.page-about .about-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 20px;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.6vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__label {
  margin-top: 8px;
  font-size: 0.79rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.page-about .about-stats__rule {
  display: block;
  height: 3px;
  margin-top: 12px;
  border-radius: 3px;
  background: linear-gradient(to right,
    var(--rule) 0%,
    var(--rule) 32%,
    rgba(29, 52, 80, 0.25) 76%,
    rgba(29, 52, 80, 0) 100%);
}

/* 资料库与比对 */
.page-about .about-lib {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .about-lib__media {
  margin: 0;
  border: 1px solid var(--border-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-navy);
}

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

.page-about .about-lib__h,
.page-about .about-archive__h,
.page-about .about-team__h {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(1.24rem, 2.6vw, 1.66rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.page-about .about-lib__text p,
.page-about .about-archive__text p,
.page-about .about-team__text p {
  margin: 0 0 14px;
  font-size: 0.93rem;
  line-height: 1.62;
  color: var(--text-secondary);
}

.page-about .about-lib__fields {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 14px;
}

.page-about .about-lib__fields li {
  position: relative;
  padding-left: 13px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.01em;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-lib__fields li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 6px;
  height: 1px;
  background: var(--accent-cyan);
}

/* 栏目体系 */
.page-about .about-archive-wrap {
  display: grid;
  gap: 26px;
}

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

.page-about .about-archive__row {
  display: grid;
  grid-template-columns: 5.6rem minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 16px;
  background: var(--panel-navy);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-archive__row:hover {
  border-color: #28466C;
}

.page-about .about-archive__tag {
  font-family: var(--font-display);
  font-size: 0.83rem;
  font-weight: 700;
  line-height: 1.3;
  padding-left: 8px;
  color: var(--c, var(--accent-cyan));
  border-left: 3px solid var(--c, var(--accent-cyan));
}

.page-about .about-archive__desc {
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 28px;
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--border-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-navy);
}

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

.page-about .about-team__facts {
  margin: 22px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--border-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 18px;
}

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

.page-about .about-team__fact dt {
  font-family: var(--font-mono);
  font-size: 1.42rem;
  font-weight: 700;
  line-height: 1;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__fact dd {
  margin: 7px 0 0;
  font-size: 0.77rem;
  line-height: 1.45;
  color: var(--text-secondary);
}

/* 使用节奏 */
.page-about .about-load {
  margin-top: 28px;
  display: grid;
  gap: 16px;
}

.page-about .about-load__row {
  display: grid;
  grid-template-columns: 5.2rem minmax(0, 1fr) 3.2rem;
  align-items: center;
  gap: 12px;
}

.page-about .about-load__k {
  font-size: 0.79rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.page-about .about-load__bar {
  position: relative;
  height: 10px;
  border-radius: 6px;
  background: rgba(29, 52, 80, 0.6);
  overflow: hidden;
}

.page-about .about-load__bar::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--w, 50%);
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(76, 141, 255, 0.9), rgba(76, 141, 255, 0.28));
}

.page-about .about-load__bar--peak::after {
  background: linear-gradient(90deg, rgba(255, 107, 44, 0.92), rgba(255, 107, 44, 0.3));
}

.page-about .about-load__v {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--text-primary);
}

.page-about .about-load__note {
  margin: 22px 0 0;
  font-size: 0.87rem;
  line-height: 1.62;
  color: var(--text-secondary);
}

/* 结尾行动区 */
.page-about .about-cta {
  display: grid;
  gap: 20px;
  padding: 28px 22px;
  border: 1px solid var(--border-line);
  border-radius: var(--radius);
  background:
    radial-gradient(520px 240px at 88% 0%, rgba(47, 224, 208, 0.09), transparent 68%),
    linear-gradient(135deg, rgba(28, 48, 74, 0.72), rgba(16, 31, 51, 0.9));
}

.page-about .about-cta__text h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.014em;
  color: var(--text-primary);
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.62;
  color: var(--text-secondary);
}

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

/* 平板 */
@media (min-width: 640px) {
  .page-about .about-lib__fields {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stats__grid {
    gap: 30px 24px;
  }
}

/* 桌面 */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 30px 0 14px;
  }

  .page-about .about-hero__inner {
    padding: 26px 0 34px;
  }

  .page-about .about-band__cap {
    padding: 26px 24px 14px;
  }

  .page-about .vtl {
    margin-top: 40px;
  }

  .page-about .vtl__item {
    padding: 0 0 14px 40px;
  }

  .page-about .ver__sum {
    padding: 17px 20px;
  }

  .page-about .ver__body {
    padding: 14px 20px 20px;
  }

  .page-about .about-stats__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 32px 28px;
  }

  .page-about .about-lib {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 44px;
  }

  .page-about .about-archive-wrap {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.76fr);
    gap: 46px;
    align-items: center;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 30px;
    padding: 34px 36px;
  }

  .page-about .about-cta__actions {
    flex-wrap: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ver,
  .page-about .ver__sum,
  .page-about .ver__idx,
  .page-about .ver__toggle::before,
  .page-about .ver__toggle::after,
  .page-about .vtl__node,
  .page-about .about-archive__row {
    transition: none;
  }

  .page-about .vtl__item:hover .vtl__node {
    transform: none;
  }
}

.page-about {
  --c: currentColor;
  --rule: transparent;
  --w: 1rem;
}