.page-about {
  --about-rail: 14rem;
  --about-note: 12rem;
  --about-body-ink: rgba(220, 230, 232, 0.86);
  --about-body-dim: rgba(220, 230, 232, 0.72);
  background: var(--abyss);
  color: var(--mist);
  font-family: var(--body);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-head {
  padding-top: clamp(1.6rem, 4vw, 2.8rem);
  padding-bottom: clamp(1.4rem, 3.5vw, 2.4rem);
  border-bottom: 1px solid var(--hard-line);
}

.page-about .about-head-grid {
  display: grid;
  gap: clamp(1.2rem, 3.5vw, 2.6rem);
  margin-top: clamp(1.4rem, 3.5vw, 2.4rem);
  align-items: end;
}

.page-about .about-h1 {
  margin: 0.4rem 0 0 -0.04em;
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(2.9rem, 12vw, 7.6rem);
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--paper);
}

.page-about .about-h1 span {
  color: var(--coral);
}

.page-about .about-lede {
  margin: 0;
  max-width: 34rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--red);
  font-size: clamp(1rem, 2.1vw, 1.2rem);
  line-height: 1.82;
  color: var(--about-body-ink);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  padding-top: 1rem;
  border-top: 1px solid var(--soft-line);
}

.page-about .about-figures .data-cell {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .about-figures .data-value {
  font-family: var(--mono);
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--coral);
}

.page-about .about-figures .data-label {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

/* ---------- 档案双栏 ---------- */
.page-about .about-archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.2rem, 3vw, 2rem);
  padding: clamp(1.8rem, 5vw, 3.6rem) 0 clamp(2.6rem, 7vw, 5.5rem);
}

.page-about .about-rail {
  overflow-x: auto;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--soft-line);
}

.page-about .about-rail-sticky {
  position: static;
}

.page-about .about-rail-label {
  margin: 0 0 0.55rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-index {
  display: flex;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index-item {
  flex: 0 0 auto;
}

.page-about .about-index-link {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.42rem 0.7rem;
  border: 1px solid var(--hard-line);
  background: var(--night);
  color: var(--cyan);
  font-size: 0.84rem;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s var(--ease-out), border-color 0.2s var(--ease-out), background 0.2s var(--ease-out);
}

.page-about .about-index-num {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--rust);
  filter: brightness(2.4);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible,
.page-about .about-index-link[aria-current] {
  color: var(--paper);
  border-color: var(--coral);
  background: rgba(194, 24, 7, 0.22);
}

.page-about .about-index-link[aria-current] .about-index-num {
  color: var(--coral);
  filter: none;
}

.page-about .about-rail-note {
  display: none;
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-chapter {
  padding-top: 1.1rem;
  border-top: 2px solid var(--hard-line);
  scroll-margin-top: 7rem;
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(2.4rem, 6vw, 4.4rem);
}

.page-about .chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.85rem;
  margin-bottom: 1.1rem;
}

.page-about .chapter-num {
  flex: 0 0 auto;
  padding: 0.18rem 0.42rem;
  border: 1px solid var(--rust);
  font-family: var(--mono);
  font-size: 0.74rem;
  line-height: 1;
  letter-spacing: 0.1em;
  color: var(--coral);
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.55rem, 5.2vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .chapter-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.2rem;
  align-items: start;
}

.page-about .chapter-main {
  min-width: 0;
}

.page-about .chapter-main p {
  margin: 0 0 0.95rem;
  max-width: 40rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-body-ink);
}

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

.page-about .chapter-after {
  margin-top: 1.1rem !important;
}

.page-about .chapter-note {
  padding: 0.2rem 0 0.2rem 0.85rem;
  border-left: 2px solid var(--red);
  color: var(--about-body-dim);
  font-size: 0.84rem;
  line-height: 1.7;
}

.page-about .chapter-note p {
  margin: 0.35rem 0 0;
}

.page-about .note-value {
  display: block;
  font-family: var(--mono);
  font-size: 1.55rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--coral);
}

.page-about .note-link {
  margin-top: 0.5rem !important;
}

.page-about .note-link a {
  color: var(--coral);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 74, 0.4);
}

.page-about .note-link a:hover,
.page-about .note-link a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 图片 ---------- */
.page-about .media-frame {
  margin: 1.3rem 0 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--hard-line);
  background: var(--night);
}

.page-about .media-caption {
  margin-top: 0.5rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 1.7rem 2.1rem;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--abyss);
  border: 2px solid var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, 0.12);
}

.page-about .timeline-item::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 1.7rem;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--red), rgba(122, 16, 10, 0.18));
}

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

.page-about .timeline-item:last-child::after {
  display: none;
}

.page-about .timeline-phase {
  margin: 0 0 0.25rem !important;
  font-family: var(--mono);
  font-size: 0.72rem !important;
  letter-spacing: 0.1em;
  color: var(--coral);
  line-height: 1.5 !important;
}

.page-about .timeline-title {
  margin: 0 0 0.4rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.02rem, 2.6vw, 1.24rem);
  line-height: 1.45;
  letter-spacing: -0.015em;
  color: var(--paper);
}

/* ---------- 角色列表 ---------- */
.page-about .role-list {
  margin: 1.1rem 0 1.1rem;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--soft-line);
}

.page-about .role-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.2rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--soft-line);
}

.page-about .role-name {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .role-desc {
  margin: 0 !important;
  font-size: 0.94rem !important;
  line-height: 1.72 !important;
  color: var(--about-body-dim) !important;
}

/* ---------- 客户场景 ---------- */
.page-about .scene-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .scene-item {
  padding: 0.95rem 1rem;
  background: var(--night);
  border-left: 3px solid var(--red);
}

.page-about .scene-item:nth-child(even) {
  border-left-color: var(--coral);
  background: rgba(11, 20, 32, 0.6);
}

.page-about .scene-title {
  margin: 0 0 0.35rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .scene-item p {
  margin: 0 !important;
  font-size: 0.92rem !important;
  line-height: 1.72 !important;
  color: var(--about-body-dim) !important;
}

/* ---------- 徽章网格 ---------- */
.page-about .badge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 0.75rem;
  align-items: start;
  margin-top: 1.2rem;
}

.page-about .badge {
  padding: 0.85rem 0.95rem;
  background: var(--night);
  border: 1px solid var(--hard-line);
  transition: border-color 0.2s var(--ease-out), transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}

.page-about .badge:nth-child(even) {
  margin-top: 0.9rem;
}

.page-about .badge:hover,
.page-about .badge:focus-within {
  border-color: var(--coral);
  transform: translateY(-3px);
  box-shadow: 4px 4px 0 rgba(122, 16, 10, 0.5);
}

.page-about .badge-k {
  display: block;
  font-family: var(--mono);
  font-size: 1.25rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--coral);
}

.page-about .badge-t {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(2.4rem, 6vw, 4rem);
  padding: clamp(1.3rem, 3.5vw, 2rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.2rem;
  border: 2px solid var(--red);
  background: linear-gradient(135deg, rgba(194, 24, 7, 0.22), rgba(5, 8, 14, 0.95) 62%);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta-title {
  margin: 0 0 0.55rem;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.35rem, 4vw, 2rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 40rem;
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--about-body-ink);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-self: end;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .role-item {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 1rem;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

/* ---------- 桌面双栏 ---------- */
@media (min-width: 860px) {
  .page-about .about-head-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-archive {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(1.6rem, 3.5vw, 3rem);
  }

  .page-about .about-rail {
    overflow-x: visible;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-rail-sticky {
    position: sticky;
    top: 7.5rem;
    padding-left: 0.9rem;
    border-left: 1px solid var(--hard-line);
  }

  .page-about .about-index {
    display: block;
  }

  .page-about .about-index-item + .about-index-item {
    margin-top: 0.15rem;
  }

  .page-about .about-index-link {
    display: grid;
    grid-template-columns: 1.7rem minmax(0, 1fr);
    gap: 0.35rem;
    padding: 0.42rem 0.6rem 0.42rem 0;
    border: 0;
    border-right: 2px solid transparent;
    background: transparent;
    font-size: 0.86rem;
    white-space: normal;
  }

  .page-about .about-index-link:hover,
  .page-about .about-index-link:focus-visible,
  .page-about .about-index-link[aria-current] {
    background: transparent;
    border-right-color: var(--coral);
    border-left-color: transparent;
    color: var(--paper);
  }

  .page-about .about-index-link[aria-current] {
    color: var(--coral);
  }

  .page-about .about-rail-note {
    display: block;
    margin-top: 1.2rem;
    padding-top: 0.8rem;
    border-top: 1px solid var(--soft-line);
  }

  .page-about .rail-note-k {
    display: block;
    font-family: var(--mono);
    font-size: 1rem;
    color: var(--coral);
    letter-spacing: -0.02em;
  }

  .page-about .rail-note-t {
    display: block;
    margin-top: 0.2rem;
    font-size: 0.74rem;
    line-height: 1.6;
    color: var(--cyan);
  }
}

@media (min-width: 1200px) {
  .page-about .chapter-inner {
    grid-template-columns: minmax(0, 1fr) var(--about-note);
    gap: 2rem;
  }

  .page-about .chapter-note {
    position: sticky;
    top: 8.5rem;
  }
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 480px) {
  .page-about .about-figures {
    gap: 0.75rem;
  }

  .page-about .badge:nth-child(even) {
    margin-top: 0.5rem;
  }

  .page-about .about-cta-actions .button {
    flex: 1 1 auto;
    text-align: center;
  }
}