.page-about {
  --about-pad: clamp(1rem, 3.4vw, 2.4rem);
  --about-head-gap: clamp(1.6rem, 4vw, 2.6rem);
  background:
    radial-gradient(1100px 520px at 88% -6%, rgba(34, 230, 200, 0.10), transparent 62%),
    radial-gradient(780px 460px at 2% 14%, rgba(196, 113, 75, 0.09), transparent 60%),
    var(--ink-900);
  color: var(--mist);
  font-family: var(--font-body);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(1.2rem, 3.5vw, 2.4rem) clamp(1.8rem, 5vw, 3.2rem);
}

.page-about .crumbs {
  margin-bottom: clamp(0.9rem, 2.6vw, 1.6rem);
}

.page-about .about-hero-frame {
  position: relative;
  border: 1px solid var(--line-strong);
  padding: var(--about-pad);
  background:
    linear-gradient(180deg, rgba(18, 42, 77, 0.58), rgba(5, 14, 31, 0.92));
  box-shadow: var(--shadow);
}

.page-about .about-hero-frame::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--line-strong) 0 1px, transparent 1px 28px);
  pointer-events: none;
}

.page-about .about-corner {
  position: absolute;
  width: 13px;
  height: 13px;
  border: 1px solid var(--cyan);
  pointer-events: none;
}
.page-about .about-corner--tl { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.page-about .about-corner--tr { top: -1px; right: -1px; border-left: 0; border-bottom: 0; }
.page-about .about-corner--bl { bottom: -1px; left: -1px; border-right: 0; border-top: 0; }
.page-about .about-corner--br { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.4rem, 3.6vw, 2.4rem);
  align-items: end;
}

.page-about h1 {
  margin: 0.4rem 0 0.9rem;
  font-size: clamp(1.95rem, 6.4vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: #fff;
}

.page-about .about-hero-copy .lede {
  margin: 0;
  font-size: clamp(0.95rem, 1.6vw, 1.02rem);
  line-height: 1.82;
  color: var(--mist);
  opacity: 0.88;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-hero-media {
  margin: 0;
}

.page-about .about-hero-media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .media-caption {
  margin: 0.7rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.62;
  letter-spacing: 0.03em;
  color: var(--stone);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.4rem) 0 0;
  padding: clamp(1.1rem, 3vw, 1.6rem) 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.1rem;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.25rem, 3.2vw, 1.8rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stat-label {
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--stone);
}

/* ---------- 主体骨架与侧栏 ---------- */

.page-about .about-body {
  padding-bottom: clamp(2.6rem, 7vw, 5.5rem);
}

.page-about .about-nav {
  margin-bottom: clamp(1.4rem, 4vw, 2.4rem);
}

.page-about .about-nav-title {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .anchor-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.4rem;
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .anchor-list::-webkit-scrollbar { display: none; }

.page-about .anchor-link {
  display: block;
  white-space: nowrap;
  padding: 0.38rem 0.82rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--mist);
  font-size: 0.81rem;
  text-decoration: none;
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .anchor-link:hover {
  border-color: var(--line-strong);
  color: #fff;
}

.page-about .anchor-link[aria-current="true"] {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节 ---------- */

.page-about .about-section {
  padding-block: clamp(2rem, 5vw, 3.4rem);
  border-top: 1px solid var(--line);
}

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

.page-about .section-head {
  max-width: 60ch;
  margin-bottom: var(--about-head-gap);
}

.page-about .section-title {
  position: relative;
  display: inline-block;
  margin: 0.35rem 0 0.85rem;
  font-size: clamp(1.5rem, 3.6vw, 2.35rem);
  line-height: 1.24;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: #fff;
}

.page-about .section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.4rem;
  height: 2px;
  width: 0;
  background: var(--cyan);
  transition: width 0.45s var(--ease);
}

.page-about .about-section.is-current .section-title::after {
  width: 3.2rem;
}

.page-about .section-head .lede {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--mist);
  opacity: 0.86;
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  position: relative;
  padding-left: 1.6rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  bottom: 1.2rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(34, 230, 200, 0.05));
}

.page-about .about-timeline .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 4.2rem minmax(0, 1fr);
  grid-template-areas:
    "year title"
    "year text";
  column-gap: 0.95rem;
  row-gap: 0.3rem;
  padding-bottom: clamp(1.4rem, 3.4vw, 2.1rem);
}

.page-about .about-timeline .tl-node {
  position: absolute;
  left: -1.6rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.16);
}

.page-about .about-timeline .tl-item--done .tl-node {
  background: var(--moss-soft);
  box-shadow: 0 0 0 4px rgba(92, 122, 90, 0.24);
}

.page-about .about-timeline .tl-label {
  grid-area: year;
  margin: 0;
  padding-top: 0.12rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-timeline .tl-title {
  grid-area: title;
  margin: 0;
  font-size: 1.03rem;
  line-height: 1.45;
  font-weight: 700;
  color: #fff;
}

.page-about .about-timeline .tl-text {
  grid-area: text;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--mist);
  opacity: 0.82;
}

.page-about .about-band {
  margin: clamp(1.2rem, 3vw, 2rem) 0 0;
}

.page-about .about-band img {
  width: 100%;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
}

/* ---------- 城市网格 ---------- */

.page-about .about-city-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-city {
  position: relative;
  padding: 1.3rem 1.2rem 1.5rem;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 42, 77, 0.44), rgba(5, 14, 31, 0.62));
  transition: border-color 0.3s var(--ease);
}

.page-about .about-city::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(34, 230, 200, 0));
  transform: scaleX(0.16);
  transform-origin: left center;
  transition: transform 0.42s var(--ease);
}

.page-about .about-city:hover {
  border-color: rgba(34, 230, 200, 0.45);
}

.page-about .about-city:hover::before {
  transform: scaleX(1);
}

.page-about .about-city-index {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-city .tag {
  margin-bottom: 0.55rem;
}

.page-about .about-city-name {
  margin: 0 0 0.5rem;
  font-size: 1.03rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.45;
}

.page-about .about-city-text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.76;
  color: var(--mist);
  opacity: 0.82;
}

/* ---------- 团队错位区 ---------- */

.page-about .about-offset {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.3rem, 3.6vw, 2rem);
  align-items: start;
}

.page-about .about-offset .offset-media {
  margin: 0;
}

.page-about .about-offset .offset-media img {
  width: 100%;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .offset-note {
  margin: 0 0 1.1rem;
  padding-left: 1rem;
  border-left: 2px solid var(--orange);
  font-size: 0.88rem;
  line-height: 1.74;
  color: var(--mist);
  opacity: 0.85;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  column-gap: 0.85rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-role-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--stone);
  padding-top: 0.22rem;
}

.page-about .about-role h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}

.page-about .about-role p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.75;
  color: var(--mist);
  opacity: 0.82;
}

/* ---------- 版本对照 ---------- */

.page-about .about-versions {
  border-top: 1px solid var(--line);
}

.page-about .about-version {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-version-label {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  letter-spacing: 0.07em;
  color: var(--cyan);
}

.page-about .about-version-body h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}

.page-about .about-version-body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.76;
  color: var(--mist);
  opacity: 0.8;
}

.page-about .about-version--current {
  border-left: 2px solid var(--cyan);
  padding-left: 1rem;
  background: linear-gradient(90deg, rgba(34, 230, 200, 0.10), transparent 72%);
}

/* ---------- 流程步骤 ---------- */

.page-about .about-flow-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-flow-steps .step {
  position: relative;
  padding: 1.4rem 1.2rem 1.5rem;
  border: 1px solid var(--line);
  background: rgba(5, 14, 31, 0.56);
}

.page-about .about-flow-steps .step-index {
  display: block;
  margin-bottom: 0.7rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-flow-steps .step-title {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}

.page-about .about-flow-steps .step-text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.76;
  color: var(--mist);
  opacity: 0.82;
}

/* ---------- 用户反馈 ---------- */

.page-about .about-feedback {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.4rem;
}

.page-about .about-feedback-main {
  padding: 1.4rem 1.2rem 1.5rem;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(34, 230, 200, 0.13), rgba(5, 14, 31, 0.55) 62%);
}

.page-about .about-feedback-num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.5rem, 8vw, 3.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-feedback-num em {
  font-style: normal;
  font-size: 0.44em;
  margin-left: 0.08em;
}

.page-about .about-feedback-text {
  margin: 0.75rem 0 0;
  font-size: 0.89rem;
  line-height: 1.72;
  color: var(--mist);
  opacity: 0.85;
}

.page-about .about-feedback-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-feedback-list li {
  padding-left: 1rem;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-feedback-list strong {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.96rem;
  font-weight: 700;
  color: #fff;
}

.page-about .about-feedback-list span {
  display: block;
  font-size: 0.88rem;
  line-height: 1.74;
  color: var(--mist);
  opacity: 0.78;
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  padding-block: clamp(2.2rem, 6vw, 3.8rem) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cta-inner {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 5vw, 2.9rem);
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(120deg, rgba(34, 230, 200, 0.11), transparent 56%),
    linear-gradient(180deg, rgba(18, 42, 77, 0.52), rgba(5, 14, 31, 0.86));
}

.page-about .about-cta-inner::after {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 47, 0.22), transparent 70%);
  pointer-events: none;
}

.page-about .about-cta-title {
  position: relative;
  margin: 0 0 0.7rem;
  font-size: clamp(1.35rem, 3.4vw, 1.95rem);
  line-height: 1.26;
  font-weight: 900;
  color: #fff;
}

.page-about .about-cta-text {
  position: relative;
  margin: 0;
  max-width: 54ch;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--mist);
  opacity: 0.85;
}

.page-about .about-cta .about-actions {
  position: relative;
  margin-top: 1.4rem;
}

/* ---------- 桌面端 ---------- */

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem 1.4rem;
  }

  .page-about .about-city-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

  .page-about .about-offset {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(1.8rem, 4vw, 3rem);
  }

  .page-about .about-offset .offset-media {
    margin-top: clamp(1.6rem, 4vw, 3rem);
  }

  .page-about .about-flow-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.2rem;
  }

  .page-about .about-flow-steps .step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -1.2rem;
    width: 1.2rem;
    height: 1px;
    background: var(--line-strong);
  }

  .page-about .about-version {
    grid-template-columns: 11rem minmax(0, 1fr);
    column-gap: 1.6rem;
    align-items: baseline;
    gap: 0;
  }

  .page-about .about-feedback {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(1.6rem, 4vw, 3rem);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: clamp(2rem, 4vw, 3.6rem);
    align-items: start;
  }

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

  .page-about .about-nav {
    position: sticky;
    top: 7rem;
    margin-bottom: 0;
  }

  .page-about .anchor-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .anchor-list li + li {
    margin-top: 0.3rem;
  }

  .page-about .anchor-link {
    white-space: normal;
    border-radius: 2px;
    border-color: transparent;
    border-left: 2px solid var(--line);
    padding: 0.35rem 0.6rem;
    font-size: 0.86rem;
    line-height: 1.5;
  }

  .page-about .anchor-link:hover {
    border-left-color: var(--line-strong);
    background: rgba(34, 230, 200, 0.05);
  }

  .page-about .anchor-link[aria-current="true"] {
    color: var(--cyan);
    background: transparent;
    border-color: transparent;
    border-left-color: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-city::before,
  .page-about .section-title::after,
  .page-about .anchor-link,
  .page-about .about-city {
    transition: none;
  }

  .page-about .about-city::before {
    transform: scaleX(1);
  }

  .page-about .about-section.is-current .section-title::after {
    width: 3.2rem;
  }
}