/* ===== 使命与路径 · 页面专属样式（作用域 .page-about） ===== */

.page-about {
  --about-line: rgba(243, 237, 226, .12);
  --about-line-soft: rgba(243, 237, 226, .06);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 4vw, 48px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  margin-top: clamp(20px, 4vw, 40px);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(34px, 7.2vw, 72px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  margin: 20px 0 0;
  max-width: 34em;
  color: var(--paper);
  opacity: .88;
}

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

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

.page-about .about-hero-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 40%;
}

.page-about .about-rhythm-bar {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--about-line);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-stats {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-stats li {
  background: var(--panel);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stats b {
  font-family: var(--mono);
  font-weight: 500;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-stats span {
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 叙事区：左轨道 + 右正文 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-rail-title {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .about-rail-list,
.page-about .about-rail-sub {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rail-list > li + li {
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-rail-list a {
  display: block;
  padding: 11px 0;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  color: var(--cyan);
}

.page-about .about-rail-sub {
  padding: 0 0 10px 14px;
  border-left: 1px solid var(--about-line);
  margin-left: 2px;
}

.page-about .about-rail-sub a {
  padding: 6px 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--brick);
}

.page-about .about-rail-sub a:hover,
.page-about .about-rail-sub a:focus-visible {
  color: var(--orange);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: 0 0 clamp(30px, 4vw, 48px);
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-chapter + .about-chapter {
  padding-top: clamp(30px, 4vw, 48px);
}

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

.page-about .about-kicker {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--orange);
}

.page-about .about-chapter .section-title {
  margin: 0 0 18px;
  color: var(--paper);
  line-height: 1.18;
}

.page-about .about-chapter p {
  margin: 0 0 16px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 237, 226, .82);
}

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

.page-about .about-note {
  margin: 0 0 18px;
  padding: 12px 0 0;
  border-top: 2px solid var(--brick);
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 三类使用者 ---------- */
.page-about .about-users {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-user {
  background: var(--panel);
  padding: 22px 20px 24px;
}

.page-about .about-user-tag {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-user h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-user p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 三段路径 ---------- */
.page-about .about-timeline {
  margin-top: 30px;
  display: grid;
  gap: clamp(28px, 4vw, 40px);
}

.page-about .about-stage {
  display: grid;
  gap: 12px;
}

.page-about .about-stage-year {
  font-family: var(--mono);
  font-weight: 500;
  font-size: clamp(38px, 9vw, 64px);
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--brick);
}

.page-about .about-stage-body h3 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(18px, 3vw, 22px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-stage-body p {
  margin: 0 0 16px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 237, 226, .8);
}

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

.page-about .about-stage .fold-head {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-list li {
  position: relative;
  padding: 0 0 0 18px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(243, 237, 226, .78);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-list li:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team-figure {
  margin: 24px 0 26px;
}

.page-about .about-team-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-team-band {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .about-team-cell {
  background: var(--panel);
  padding: 20px 18px 22px;
  border-top: 2px solid transparent;
  transition: background .24s var(--ease), border-top-color .24s var(--ease);
}

.page-about .about-team-cell:hover {
  background: #162133;
  border-top-color: var(--cyan);
}

.page-about .about-team-num {
  display: block;
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--brick);
}

.page-about .about-team-cell h3 {
  margin: 8px 0 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper);
}

.page-about .about-team-cell p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 覆盖与协作 ---------- */
.page-about .about-coverage-figure {
  margin: 22px 0 26px;
}

.page-about .about-coverage-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 下一步 ---------- */
.page-about .about-next-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-next-list li {
  padding: 20px 0 20px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-next-list li:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-next-list h3 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-next-list p {
  margin: 0;
  max-width: 38em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta {
  margin-top: 32px;
  padding: 24px 22px 26px;
  border-radius: 6px;
}

.page-about .about-cta p {
  margin: 0 0 18px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-stage {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .about-stage-year {
    position: sticky;
    top: calc(var(--bar) + 20px);
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
  }

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

  .page-about .about-next-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--about-line);
    border: 1px solid var(--about-line);
    border-radius: 4px;
    overflow: hidden;
  }

  .page-about .about-next-list li {
    background: var(--panel);
    border: 0;
    padding: 22px 20px 24px;
  }

  .page-about .about-next-list li:last-child {
    border-bottom: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--bar) + 28px);
  }

  .page-about .about-note {
    float: right;
    width: 208px;
    margin: 4px 0 18px 40px;
    padding: 10px 0 0;
    border-top: 2px solid var(--brick);
  }
}