.page-about {
  background: var(--ink-800);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .annotation {
  color: var(--note);
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  text-transform: none;
  margin: 0 0 8px;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: calc(var(--header-h) + clamp(40px, 8vw, 96px));
  padding-bottom: clamp(48px, 8vw, 100px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  right: -20%;
  bottom: auto;
  left: -20%;
  height: 138%;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(52% 58% at 78% 6%, rgba(201, 162, 75, 0.17), transparent 68%),
    radial-gradient(42% 48% at 6% 92%, rgba(181, 52, 44, 0.13), transparent 72%),
    linear-gradient(158deg, rgba(20, 41, 74, 0.96) 0%, rgba(11, 27, 51, 0.28) 58%, rgba(11, 27, 51, 0) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 14%;
  right: -8%;
  width: min(430px, 46vw);
  height: min(430px, 46vw);
  z-index: -1;
  pointer-events: none;
  border-radius: 44% 56% 38% 62% / 52% 44% 56% 48%;
  border: 1px solid rgba(201, 162, 75, 0.22);
  background: linear-gradient(140deg, rgba(201, 162, 75, 0.16), rgba(201, 162, 75, 0));
  transform: rotate(-12deg);
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 58px);
  align-items: end;
}

.page-about .about-hero-copy .breadcrumbs {
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .about-hero-copy .eyebrow {
  color: var(--gold);
  letter-spacing: 0.16em;
  font-size: 0.75rem;
  margin: 0 0 12px;
}

.page-about .about-hero-copy h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.95rem, 5.4vw, 3.35rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  color: var(--paper);
}

.page-about .about-hero-lead {
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.85;
  color: rgba(242, 237, 227, 0.86);
  max-width: 60ch;
  margin: 0 0 clamp(22px, 3.4vw, 32px);
}

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

.page-about .about-hero-panel {
  border-radius: var(--radius-lg);
  background: rgba(6, 15, 31, 0.62);
  border: 1px solid var(--line-gold);
  border-top: 3px solid var(--gold);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-facts {
  margin: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-fact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 16px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line-soft);
}

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

.page-about .about-fact-key {
  margin: 0;
  color: var(--note);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.page-about .about-fact-val {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.92rem;
  color: var(--gold-bright);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter--tint {
  background: linear-gradient(180deg, rgba(20, 41, 74, 0.62) 0%, rgba(20, 41, 74, 0.18) 100%);
}

.page-about .about-chapter-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 46px);
}

.page-about .about-chapter-rail .big-number {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 300;
  font-size: clamp(2.1rem, 4.6vw, 3.4rem);
  line-height: 1;
  color: rgba(201, 162, 75, 0.9);
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-chapter-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.35rem, 2.6vw, 1.95rem);
  line-height: 1.34;
  margin: 0;
  color: var(--paper);
}

.page-about .about-chapter-body > p {
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(242, 237, 227, 0.84);
  margin: 0 0 clamp(16px, 2.4vw, 22px);
}

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

.page-about .about-lead {
  font-size: clamp(1rem, 1.7vw, 1.1rem);
  line-height: 1.85;
  color: var(--paper);
  padding-left: 16px;
  border-left: 3px solid var(--gold);
  margin: 0 0 clamp(22px, 3vw, 30px);
}

.page-about .about-note {
  margin-top: clamp(22px, 3vw, 30px);
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: rgba(6, 15, 31, 0.5);
  border-left: 3px solid var(--vermilion);
}

.page-about .about-note p:not(.annotation) {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(242, 237, 227, 0.78);
}

.page-about .about-figure {
  margin: clamp(24px, 3.4vw, 34px) 0;
}

/* ---------- 厅别名册 ---------- */

.page-about .hall-roster {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 30px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}

.page-about .hall-roster-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 15px;
  border-radius: var(--radius-md);
  background: rgba(6, 15, 31, 0.55);
  border-left: 3px solid var(--hall-color, var(--gold));
  transition: background-color 220ms ease, transform 220ms ease;
}

.page-about .hall-roster-item:hover,
.page-about .hall-roster-item:focus-within {
  background: rgba(28, 55, 96, 0.72);
  transform: translateX(3px);
}

.page-about .hall-dot {
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--hall-color, var(--gold));
}

.page-about .hall-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.88rem;
  color: var(--gold-bright);
}

.page-about .hall-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}

/* ---------- 编号示意 ---------- */

.page-about .code-sample {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 10px;
  margin: 0 0 clamp(20px, 3vw, 26px);
}

.page-about .code-seg {
  flex: 1 1 150px;
  min-width: 0;
  padding: 18px 16px;
  border-radius: var(--radius-md);
  background: rgba(6, 15, 31, 0.58);
  border-top: 3px solid var(--gold);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .code-seg--hall {
  border-top-color: var(--hall-03);
}

.page-about .code-seg--type {
  border-top-color: var(--gold);
}

.page-about .code-seg--no {
  border-top-color: var(--vermilion);
}

.page-about .code-seg-val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1;
  color: var(--paper);
}

.page-about .code-seg-label {
  color: var(--note);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
}

.page-about .code-dash {
  align-self: center;
  color: var(--line-gold);
  font-size: 1.4rem;
}

.page-about .code-explain {
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(201, 162, 75, 0.1);
  border: 1px solid var(--line-gold);
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--paper);
  margin: 0 0 clamp(20px, 3vw, 26px);
}

.page-about .code-explain .mono {
  color: var(--gold-bright);
  font-weight: 700;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0 0 clamp(24px, 3.4vw, 34px);
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-left: 26px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 75, 0.16);
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold-bright);
}

.page-about .timeline-node {
  border-radius: var(--radius-md);
  background: rgba(6, 15, 31, 0.5);
  border: 1px solid var(--line-soft);
  padding: 14px 16px;
}

.page-about .timeline-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--paper);
  list-style: none;
}

.page-about .timeline-summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline-summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--gold);
}

.page-about .timeline-node[open] .timeline-summary::after {
  content: "–";
}

.page-about .timeline-summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

.page-about .timeline-desc {
  margin: 12px 0 0;
  font-size: 0.94rem;
  line-height: 1.82;
  color: rgba(242, 237, 227, 0.8);
}

/* ---------- 团队三条线 ---------- */

.page-about .crew-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: clamp(24px, 3.4vw, 32px);
}

.page-about .crew-card {
  --crew-color: var(--gold);
  padding: 20px 18px;
  border-radius: var(--radius-md);
  background: rgba(6, 15, 31, 0.56);
  border-top: 3px solid var(--crew-color);
}

.page-about .crew-card--content {
  --crew-color: var(--gold);
}

.page-about .crew-card--proof {
  --crew-color: var(--hall-01);
}

.page-about .crew-card--service {
  --crew-color: var(--vermilion);
}

.page-about .crew-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--crew-color);
  border: 1px solid currentColor;
  border-radius: var(--radius-pill);
  padding: 3px 10px;
  margin-bottom: 12px;
}

.page-about .crew-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.5;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .crew-text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(242, 237, 227, 0.78);
}

/* ---------- 每周轮转 ---------- */

.page-about .week-rail {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 30px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 8px;
}

.page-about .week-cell {
  padding: 13px 12px;
  border-radius: var(--radius-md);
  background: rgba(6, 15, 31, 0.55);
  border-top: 3px solid var(--hall-color, var(--gold));
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .week-day {
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--note);
}

.page-about .week-hall {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--paper);
}

.page-about .rhythm-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0 0 clamp(22px, 3vw, 30px);
}

.page-about .rhythm-item {
  padding: 18px 18px 16px;
  border-radius: var(--radius-md);
  background: rgba(20, 41, 74, 0.6);
  border-left: 3px solid var(--gold);
}

.page-about .rhythm-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.7rem, 3.6vw, 2.3rem);
  line-height: 1;
  color: var(--gold-bright);
  margin-bottom: 8px;
}

.page-about .rhythm-label {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.94rem;
  color: var(--paper);
  margin-bottom: 6px;
}

.page-about .rhythm-text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(242, 237, 227, 0.74);
}

/* ---------- 咨询 ---------- */

.page-about .help-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .help-card {
  padding: 20px 18px;
  border-radius: var(--radius-md);
  background: rgba(6, 15, 31, 0.56);
  border-left: 3px solid var(--vermilion);
}

.page-about .help-card--plain {
  border-left-color: var(--hall-01);
}

.page-about .help-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .help-list li {
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(242, 237, 227, 0.8);
}

.page-about .help-key {
  display: inline-block;
  margin-right: 8px;
  color: var(--gold-bright);
  font-weight: 700;
  font-size: 0.86rem;
  letter-spacing: 0.03em;
}

.page-about .help-tail {
  font-size: 0.96rem;
  line-height: 1.85;
  color: rgba(242, 237, 227, 0.84);
  margin: 0;
}

.page-about .inline-link {
  color: var(--gold-bright);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  transition: border-color 200ms ease, color 200ms ease;
}

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

/* ---------- 结尾 ---------- */

.page-about .about-outro {
  padding-block: clamp(48px, 7vw, 92px);
  border-top: 1px solid var(--line-gold);
  background:
    radial-gradient(58% 90% at 12% 100%, rgba(181, 52, 44, 0.16), transparent 70%),
    linear-gradient(180deg, rgba(20, 41, 74, 0.5) 0%, rgba(6, 15, 31, 0.85) 100%);
}

.page-about .about-outro-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 40px);
  align-items: center;
}

.page-about .about-outro-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  line-height: 1.3;
  margin: 0 0 14px;
  color: var(--paper);
}

.page-about .about-outro-text {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.85;
  color: rgba(242, 237, 227, 0.82);
  max-width: 62ch;
}

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

/* ---------- 厅别识别色 ---------- */

.page-about .hall-01 { --hall-color: var(--hall-01); }
.page-about .hall-02 { --hall-color: var(--hall-02); }
.page-about .hall-03 { --hall-color: var(--hall-03); }
.page-about .hall-04 { --hall-color: var(--hall-04); }
.page-about .hall-05 { --hall-color: var(--hall-05); }
.page-about .hall-06 { --hall-color: var(--hall-06); }
.page-about .hall-07 { --hall-color: var(--hall-07); }

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .code-seg {
    flex: 1 1 0;
  }

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

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

  .page-about .timeline-item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 20px;
    padding-left: 26px;
  }

  .page-about .timeline-item::before {
    top: 16px;
  }

  .page-about .timeline-year {
    padding-top: 14px;
  }
}

@media (min-width: 760px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr);
  }

  .page-about .about-chapter-grid {
    grid-template-columns: minmax(0, 0.44fr) minmax(0, 1fr);
    gap: clamp(34px, 5.5vw, 78px);
  }

  .page-about .about-chapter-rail {
    position: sticky;
    top: calc(var(--header-h) + 30px);
    align-self: start;
  }

  .page-about .about-outro-inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.75fr);
    justify-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .rhythm-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-chapter-grid {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .hall-roster-item {
    transition: none;
  }

  .page-about .hall-roster-item:hover,
  .page-about .hall-roster-item:focus-within {
    transform: none;
  }
}