.page-about {
  --about-grid: rgba(27, 21, 18, 0.045);
  --about-rule: rgba(110, 98, 82, 0.35);
  --about-rule-soft: rgba(110, 98, 82, 0.22);
  --about-text-soft: #4a4038;
}

.page-about .band {
  position: relative;
  padding: clamp(38px, 6vw, 82px) 0;
}

.page-about .band--paper {
  background-color: var(--paper);
  color: var(--ink);
  background-image:
    linear-gradient(to right, var(--about-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-grid) 1px, transparent 1px);
  background-size: 52px 52px;
  border-bottom: 1px solid rgba(27, 21, 18, 0.1);
}

.page-about .band--shade {
  background-color: var(--paper-light);
  color: var(--ink);
  background-image:
    linear-gradient(to right, var(--about-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-grid) 1px, transparent 1px);
  background-size: 52px 52px;
  border-bottom: 1px solid rgba(27, 21, 18, 0.1);
}

.page-about .band--dark {
  background-color: var(--night-2);
  color: var(--paper);
  background-image:
    linear-gradient(to right, rgba(232, 220, 192, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(232, 220, 192, 0.05) 1px, transparent 1px);
  background-size: 52px 52px;
  border-bottom: 1px solid rgba(232, 220, 192, 0.12);
}

.page-about .band--hero {
  padding-top: clamp(20px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ash);
  padding-bottom: clamp(16px, 3vw, 26px);
}

.page-about .breadcrumb a {
  color: var(--link);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  border-bottom: 1px solid var(--signal);
}

.page-about .dossier-hero {
  max-width: 880px;
  padding-bottom: clamp(10px, 2vw, 20px);
}

.page-about .dossier-hero .label {
  color: var(--rust);
}

.page-about .dossier-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 5.6vw, 50px);
  line-height: 1.16;
  letter-spacing: 0.005em;
  color: var(--ink);
  margin: 16px 0 0;
}

.page-about .hero-lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.8;
  color: var(--about-text-soft);
}

.page-about .hero-index {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  border-top: 2px solid var(--ink);
}

.page-about .hero-index li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 24px 14px 0;
  margin-right: 24px;
  border-right: 1px solid var(--about-rule);
}

.page-about .hero-index li:last-child {
  border-right: none;
  margin-right: 0;
  padding-right: 0;
}

.page-about .hero-index .label {
  color: var(--ash);
}

.page-about .hero-index .data {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--signal);
}

/* ---------- 章节标题 ---------- */

.page-about .section-head {
  max-width: 74ch;
  margin-bottom: clamp(22px, 3vw, 36px);
  border-top: 2px solid var(--ink);
  padding-top: 16px;
}

.page-about .band--dark .section-head {
  border-top-color: var(--signal);
}

.page-about .section-head h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 32px);
  line-height: 1.32;
  margin: 0;
  color: var(--ink);
}

.page-about .band--dark .section-head h2 {
  color: var(--paper-light);
}

.page-about .section-sub {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-text-soft);
}

.page-about .band--dark .section-sub {
  color: rgba(232, 220, 192, 0.78);
}

/* ---------- 图片 ---------- */

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

.page-about .hero-plate {
  margin: 0 0 10px;
}

.page-about .ledger-note {
  max-width: 56ch;
  margin: 14px 0 0;
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  --tl-pad: 52px;
  position: relative;
  counter-reset: tl;
  margin-top: clamp(26px, 4vw, 42px);
  padding-left: var(--tl-pad);
  max-width: 66ch;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background-image: repeating-linear-gradient(to bottom, var(--ash) 0 7px, transparent 7px 14px);
  opacity: 0.6;
}

.page-about .tl-node {
  position: relative;
  counter-increment: tl;
  padding-bottom: 6px;
}

.page-about .tl-node::before {
  content: counter(tl, decimal-leading-zero);
  position: absolute;
  left: calc(-1 * var(--tl-pad));
  top: 4px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--seal);
  background: radial-gradient(circle at 34% 26%, #22392f, var(--night) 74%);
  box-shadow: inset 0 0 0 1px rgba(232, 179, 60, 0.45), 0 1px 0 rgba(27, 21, 18, 0.22);
  z-index: 1;
}

.page-about .tl-node[open]::before {
  color: var(--signal);
  box-shadow: inset 0 0 0 1px rgba(240, 90, 36, 0.65), 0 1px 0 rgba(27, 21, 18, 0.22);
}

.page-about .tl-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 4px 0 12px;
  cursor: pointer;
  border-bottom: 1px solid var(--about-rule);
  list-style: none;
}

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

.page-about .tl-head::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ash);
}

.page-about .tl-node[open] .tl-head::after {
  content: "－";
  color: var(--signal);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .tl-body {
  padding: 12px 0 18px;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .tl-node:last-child .tl-body {
  border-bottom: none;
}

.page-about .tl-body p {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--about-text-soft);
}

/* ---------- 团队分工 ---------- */

.page-about .crew-grid {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 2px solid var(--ink);
}

.page-about .crew-col {
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .crew-col:last-child {
  border-bottom: none;
}

.page-about .crew-col__name {
  margin: 0 0 10px;
  font-family: var(--font-label);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ink);
}

.page-about .crew-col p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text-soft);
}

.page-about .crew-plate {
  margin-top: clamp(26px, 4vw, 40px);
  display: grid;
  gap: 18px;
}

.page-about .crew-plate .ledger-note {
  align-self: end;
  margin: 0;
}

/* ---------- 三级校对 ---------- */

.page-about .steps {
  display: grid;
  gap: 24px;
}

.page-about .step {
  border-top: 2px solid var(--signal);
  padding-top: 16px;
}

.page-about .step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  letter-spacing: 0.04em;
  color: var(--seal);
}

.page-about .step__title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--paper-light);
}

.page-about .step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(232, 220, 192, 0.8);
}

/* ---------- 年鉴与资料交换 ---------- */

.page-about .almanac-grid {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .almanac-text p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--about-text-soft);
}

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

.page-about .almanac-plate {
  margin: 0;
  max-width: 420px;
}

.page-about .almanac {
  margin-top: clamp(26px, 4vw, 40px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 12px;
}

.page-about .almanac-track {
  display: flex;
  gap: 12px;
  padding: 8px 2px;
  min-width: max-content;
}

.page-about .season-chip.almanac-spine {
  flex: 0 0 auto;
  width: 68px;
  height: 208px;
  border: 0;
  border-radius: 2px;
  padding: 20px 0;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--seal);
  background: linear-gradient(100deg, #0c221c 0%, #1a3a30 44%, #0b1f1a 100%);
  box-shadow:
    inset 1px 0 0 rgba(232, 179, 60, 0.35),
    inset -2px 0 6px rgba(0, 0, 0, 0.55),
    0 2px 0 rgba(27, 21, 18, 0.2);
  transition: transform 0.3s var(--ease), color 0.2s ease, box-shadow 0.3s var(--ease);
}

.page-about .season-chip.almanac-spine:hover,
.page-about .season-chip.almanac-spine:focus-visible {
  transform: translateY(-6px);
  color: var(--signal);
  box-shadow:
    inset 1px 0 0 rgba(240, 90, 36, 0.6),
    inset -2px 0 6px rgba(0, 0, 0, 0.55),
    0 6px 12px rgba(27, 21, 18, 0.22);
  outline: none;
}

.page-about .season-chip.almanac-spine:focus-visible {
  box-shadow:
    inset 1px 0 0 rgba(240, 90, 36, 0.6),
    0 0 0 2px var(--signal);
}

.page-about .season-chip.almanac-spine[aria-pressed="true"] {
  color: var(--signal);
  box-shadow:
    inset 1px 0 0 rgba(240, 90, 36, 0.75),
    inset -2px 0 6px rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(240, 90, 36, 0.4);
}

.page-about .spine-mark {
  writing-mode: vertical-rl;
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.2em;
}

.page-about .spine-num {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--paper-light);
}

.page-about .spine-year {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(232, 220, 192, 0.6);
}

/* ---------- 我们在意什么 ---------- */

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

.page-about .focus-item {
  padding: 20px 0 20px 20px;
  border-left: 3px solid var(--seal);
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .focus-item:last-child {
  border-bottom: none;
}

.page-about .focus-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .focus-item p {
  margin: 0;
  max-width: 70ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--about-text-soft);
}

.page-about .focus-item a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 90, 70, 0.45);
}

.page-about .focus-item a:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* ---------- 收束 ---------- */

.page-about .about-cta {
  max-width: 720px;
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.3;
  color: var(--paper-light);
}

.page-about .about-cta p {
  margin: 0 0 26px;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(232, 220, 192, 0.8);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .crew-col {
    padding: 22px 22px 26px;
    border-left: 1px solid var(--about-rule-soft);
    border-bottom: none;
  }

  .page-about .crew-col:nth-child(odd) {
    border-left: none;
    padding-left: 0;
  }

  .page-about .crew-col:nth-child(even) {
    padding-right: 0;
  }

  .page-about .crew-col:nth-child(n + 3) {
    border-top: 1px solid var(--about-rule-soft);
  }

  .page-about .crew-plate {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
    gap: 32px;
  }
}

@media (min-width: 880px) {
  .page-about .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 34px;
  }

  .page-about .almanac-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .almanac-plate {
    margin-left: auto;
  }
}

@media (min-width: 1080px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .crew-col {
    padding: 24px 20px 8px;
    border-left: 1px solid var(--about-rule-soft);
    border-top: none;
  }

  .page-about .crew-col:nth-child(odd) {
    padding-left: 20px;
  }

  .page-about .crew-col:nth-child(1) {
    border-left: none;
    padding-left: 0;
  }

  .page-about .crew-col:nth-child(even) {
    padding-right: 20px;
  }

  .page-about .crew-col:nth-child(4) {
    padding-right: 0;
  }

  .page-about .about-timeline {
    --tl-pad: 58px;
  }

  .page-about .about-timeline::before {
    left: 19px;
  }

  .page-about .tl-node::before {
    width: 40px;
    height: 40px;
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season-chip.almanac-spine {
    transition: none;
  }

  .page-about .season-chip.almanac-spine:hover,
  .page-about .season-chip.almanac-spine:focus-visible {
    transform: none;
  }
}