.page-about {
  --about-gold-soft: rgba(217, 164, 65, 0.36);
  --about-gold-faint: rgba(217, 164, 65, 0.10);
  --about-marker-w: 118px;
  --about-panel-top: rgba(36, 19, 53, 0.86);
  --about-panel-bot: rgba(23, 12, 34, 0.92);
  color: var(--paper);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding-top: clamp(16px, 3vw, 34px);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.page-about .crumbs__item + .crumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .crumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 44px);
  padding-bottom: clamp(28px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero__kicker {
  display: inline-block;
  margin: 0 0 clamp(12px, 2vw, 20px);
  padding: 4px 10px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--gold);
  border: 1px solid var(--about-gold-soft);
  background: linear-gradient(180deg, rgba(217, 164, 65, 0.10), transparent);
}
.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.6vw, 26px);
  max-width: 17ch;
  line-height: 1.08;
  letter-spacing: -0.01em;
}
.page-about .about-hero__lead {
  margin: 0 0 clamp(22px, 3.6vw, 40px);
  max-width: 46ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(26px, 4vw, 48px);
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--panel);
}
.page-about .about-stats__num {
  font-size: 24px;
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: 0.02em;
}
.page-about .about-stats__label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .about-hero__figure {
  margin: 0;
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  box-shadow: 0 0 0 1px var(--about-gold-faint), 0 30px 70px -50px rgba(217, 164, 65, 0.7);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding-top: clamp(44px, 8vw, 104px);
}
.page-about .about-chapter__head {
  margin-bottom: clamp(24px, 4vw, 48px);
  max-width: 62ch;
}
.page-about .about-chapter__kicker {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.26em;
  color: var(--magenta);
}
.page-about .about-chapter__head h2 {
  margin: 0 0 14px;
  max-width: 22ch;
  line-height: 1.14;
}
.page-about .about-chapter__lead {
  margin: 0;
  max-width: 48ch;
  color: var(--mist);
  line-height: 1.8;
}
.page-about .about-chapter a {
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid var(--about-gold-soft);
  transition: color var(--t), border-color var(--t);
}
.page-about .about-chapter a:hover,
.page-about .about-chapter a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--gold-hi);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}
.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.page-about .about-timeline__mark {
  display: flex;
  align-items: center;
  gap: 12px;
}
.page-about .about-timeline__year {
  font-size: 15px;
  letter-spacing: 0.12em;
  color: var(--gold);
}
.page-about .about-timeline__node {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--about-gold-soft), transparent);
  position: relative;
}
.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: -3px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--gold);
  background: var(--ink);
  transform: rotate(45deg);
}

.page-about .about-timeline__card {
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--about-panel-top), var(--about-panel-bot));
  box-shadow: 4px 4px 0 0 rgba(74, 46, 99, 0.35);
}
.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.35;
  color: var(--gold-hi);
}
.page-about .about-timeline__card p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-timeline__item--media {
  margin: clamp(4px, 1.5vw, 12px) 0;
}
.page-about .about-mid-figure {
  margin: 0;
}
.page-about .about-mid-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}
.page-about .about-team-copy p {
  margin: 0 0 16px;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}
.page-about .about-team-figure {
  margin: 0;
}
.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
  box-shadow: 6px 6px 0 0 rgba(74, 46, 99, 0.35);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.page-about .about-role details {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--about-panel-top), var(--about-panel-bot));
  transition: border-color var(--t), background var(--t);
}
.page-about .about-role details[open] {
  border-color: var(--about-gold-soft);
  background: linear-gradient(180deg, rgba(48, 26, 70, 0.92), rgba(23, 12, 34, 0.94));
}
.page-about .about-role__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-role__head::-webkit-details-marker {
  display: none;
}
.page-about .about-role__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--gold);
}
.page-about .about-role details[open] .about-role__head::after {
  content: "−";
}
.page-about .about-role__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
  letter-spacing: 0.02em;
}
.page-about .about-role__body {
  margin: 0;
  padding: 0 14px 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 版本号 ---------- */
.page-about .about-version-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  margin-bottom: clamp(24px, 4vw, 44px);
}
.page-about .about-version-code {
  padding: clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--about-gold-soft);
  background:
    linear-gradient(180deg, rgba(217, 164, 65, 0.10), transparent 60%),
    var(--panel);
}
.page-about .about-version-code__hint {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
}
.page-about .about-version-code__value {
  margin: 0 0 12px;
  font-size: clamp(30px, 6vw, 46px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0.06em;
}
.page-about .about-version-code__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper);
}
.page-about .about-version-explain p {
  margin: 0 0 14px;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}
.page-about .about-version-explain p:last-child {
  margin-bottom: 0;
}

.page-about .about-ver-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .about-ver-list__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--t);
}
.page-about .about-ver-list__row:hover {
  background: rgba(57, 216, 224, 0.05);
}
.page-about .about-ver-list__code {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}
.page-about .about-ver-list__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper);
}
.page-about .about-ver-list__link {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
  text-decoration: none;
  justify-self: start;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t), color var(--t);
}
.page-about .about-ver-list__link:hover,
.page-about .about-ver-list__link:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold-hi);
}
.page-about .about-ver-more {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .about-cadence__card {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--about-panel-top), var(--about-panel-bot));
}
.page-about .about-cadence__card--accent {
  border-color: var(--about-gold-soft);
  background:
    linear-gradient(180deg, rgba(217, 164, 65, 0.10), transparent 55%),
    linear-gradient(180deg, var(--about-panel-top), var(--about-panel-bot));
}
.page-about .about-cadence__freq {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}
.page-about .about-cadence__card--accent .about-cadence__freq {
  color: var(--magenta);
}
.page-about .about-cadence__title {
  margin: 0 0 12px;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.32;
  color: var(--gold-hi);
  font-family: var(--font-display);
  font-weight: 800;
}
.page-about .about-cadence__card p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}

/* ---------- 渠道 ---------- */
.page-about .about-channel-block {
  padding: clamp(20px, 3vw, 32px);
  border-left: 2px solid var(--cyan);
  background: linear-gradient(90deg, rgba(57, 216, 224, 0.07), transparent 65%);
}
.page-about .about-channel-block p {
  margin: 0 0 14px;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}
.page-about .about-channel-block p:last-child {
  margin-bottom: 0;
}

/* ---------- 答复机制 ---------- */
.page-about .about-service {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-bottom: clamp(20px, 3vw, 34px);
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-service__stat {
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--panel);
}
.page-about .about-service__num {
  margin: 0 0 6px;
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: 0.04em;
}
.page-about .about-service__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .about-service__note {
  padding: 16px 18px;
  border: 1px dashed var(--line);
  background: rgba(23, 12, 34, 0.6);
}
.page-about .about-service__note p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}

/* ---------- 联络 ---------- */
.page-about .about-contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: clamp(18px, 3vw, 28px);
}
.page-about .about-contact-item {
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--about-panel-top), var(--about-panel-bot));
}
.page-about .about-contact-item__label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--mist);
}
.page-about .about-contact-item__value {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.4;
  color: var(--gold-hi);
  font-weight: 600;
  word-break: break-word;
}
.page-about .about-contact-item__desc {
  margin: 0;
  max-width: 44ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .about-contact-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
}
.page-about .about-copy-status {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  min-height: 1em;
}
.page-about .about-contact-tail {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-service {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-contact-item--wide {
    grid-column: 1 / -1;
  }
  .page-about .about-ver-list__row {
    grid-template-columns: 108px minmax(0, 1fr) auto;
    gap: 18px;
    align-items: center;
  }
  .page-about .about-ver-list__link {
    justify-self: end;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about {
    --about-marker-w: 132px;
  }
  .page-about .about-hero__title {
    max-width: 15ch;
  }
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-about .about-team-figure {
    margin-top: 8px;
  }
  .page-about .about-version-block {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
  .page-about .about-timeline__item {
    grid-template-columns: var(--about-marker-w) minmax(0, 1fr);
    gap: clamp(22px, 3vw, 40px);
  }
  .page-about .about-timeline__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-top: 4px;
    border-right: 1px solid var(--about-gold-soft);
    padding-right: 22px;
  }
  .page-about .about-timeline__node {
    flex: none;
    width: 100%;
  }
  .page-about .about-timeline__item:nth-child(1) .about-timeline__card { max-width: 48ch; }
  .page-about .about-timeline__item:nth-child(2) .about-timeline__card { max-width: 55ch; }
  .page-about .about-timeline__item:nth-child(4) .about-timeline__card { max-width: 60ch; }
  .page-about .about-timeline__item:nth-child(5) .about-timeline__card { max-width: 66ch; }
  .page-about .about-timeline__item--media {
    grid-template-columns: 1fr;
  }
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
</main>