.page-about {
  --about-narrow: 940px;
  --about-hair: rgba(147, 169, 191, 0.22);
  --about-inksoft: rgba(241, 244, 241, 0.86);
  display: block;
  background: var(--pitch-900);
  color: var(--paper);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(28px, 5vw, 64px) 0 clamp(30px, 5vw, 64px);
  background:
    radial-gradient(130% 105% at 6% -12%, rgba(14, 59, 44, 0.96) 0%, rgba(8, 37, 28, 0) 62%),
    linear-gradient(180deg, var(--pitch-900) 0%, #061c15 100%);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(147, 169, 191, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(147, 169, 191, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 78%);
}

.page-about .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cool-slate);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: rgba(147, 169, 191, 0.5);
}

.page-about .breadcrumb a {
  color: var(--cool-slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--signal-orange);
  border-bottom-color: var(--signal-orange);
}

.page-about .about-hero__kicker {
  display: inline-block;
  margin: 0 0 18px;
  padding: 5px 11px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--signal-orange);
  background: rgba(255, 107, 26, 0.09);
  border: 1px solid rgba(255, 107, 26, 0.42);
  border-radius: var(--radius);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 16em;
  font-size: clamp(34px, 6.6vw, 84px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--signal-orange);
}

.page-about .about-hero__lead {
  margin: 24px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool-slate);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 52px) 0 0;
  padding: 0;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-hero__fact {
  margin: 0;
  padding: 15px 16px 17px;
  background: rgba(16, 19, 23, 0.74);
}

.page-about .about-hero__fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cool-slate);
}

.page-about .about-hero__fact dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__fact dd span {
  margin-left: 0.25em;
  font-size: 13px;
  font-weight: 500;
  color: var(--cool-slate);
}

/* ---------- 章节色带 ---------- */
.page-about .about-band {
  height: 12px;
  background: var(--indigo-800);
}

.page-about .about-band--wine {
  background: var(--wine-800);
}

.page-about .about-band--signal {
  background: var(--signal-orange);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(44px, 6.5vw, 96px) 0;
}

.page-about .about-chapter--narrow {
  background: var(--pitch-900);
}

.page-about .about-chapter--wide {
  background: var(--pitch-700);
}

.page-about .about-chapter--dark {
  background: var(--charcoal-900);
}

.page-about .about-chapter--timeline {
  background: var(--indigo-800);
  padding-bottom: clamp(44px, 6vw, 88px);
}

.page-about .about-chapter--tail {
  background: linear-gradient(180deg, var(--pitch-900) 0%, var(--pitch-700) 100%);
}

.page-about .about-chapter--narrow .container {
  max-width: var(--about-narrow);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 40px);
}

.page-about .about-side {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-side__num {
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-side__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cool-slate);
}

.page-about .about-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-about .about-head__code {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--signal-orange);
}

.page-about .about-head__title {
  margin: 0;
  max-width: 22em;
  font-size: clamp(25px, 3.6vw, 44px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-head__sub {
  margin: 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cool-slate);
}

.page-about .about-body p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.88;
  color: var(--about-inksoft);
}

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

.page-about .about-body .about-head__title {
  margin-bottom: 20px;
  font-size: clamp(23px, 3vw, 34px);
}

.page-about .about-body a {
  color: var(--signal-orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 26, 0.42);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

/* ---------- 数据来源 ---------- */
.page-about .about-sources {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  background: var(--charcoal-900);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.75;
  color: var(--cool-slate);
}

.page-about .about-source-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-source {
  padding: 17px 18px 19px;
  background: rgba(16, 19, 23, 0.58);
  border-left: 2px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-source:hover {
  background: rgba(255, 107, 26, 0.08);
  border-left-color: var(--signal-orange);
}

.page-about .about-source__k {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal-orange);
}

.page-about .about-source__t {
  margin: 7px 0 5px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-source__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--cool-slate);
}

/* ---------- 四级流程 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  position: relative;
  padding: 24px 18px 24px;
  background: linear-gradient(180deg, rgba(23, 35, 63, 0.55), rgba(16, 19, 23, 0.55));
  border: 1px solid var(--about-hair);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: #93a9bf;
}

.page-about .about-step:nth-child(2)::before {
  background: #6e8da9;
}

.page-about .about-step:nth-child(3)::before {
  background: #ff8a45;
}

.page-about .about-step:nth-child(4)::before {
  background: var(--signal-orange);
}

.page-about .about-step:hover {
  border-color: rgba(255, 107, 26, 0.5);
}

.page-about .about-step__n {
  display: block;
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--cool-slate);
  font-variant-numeric: tabular-nums;
}

.page-about .about-step__t {
  margin: 14px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-step__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--cool-slate);
}

.page-about .about-figure--process {
  margin-top: clamp(24px, 3.4vw, 44px);
}

/* ---------- 团队档案卡 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 40px 18px 24px;
  background:
    linear-gradient(180deg, rgba(244, 246, 244, 0.07), rgba(244, 246, 244, 0.02));
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  border-color: rgba(255, 107, 26, 0.6);
  background: linear-gradient(180deg, rgba(255, 107, 26, 0.1), rgba(244, 246, 244, 0.02));
}

.page-about .about-card__code {
  position: absolute;
  top: 12px;
  right: 14px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(147, 169, 191, 0.8);
}

.page-about .about-card__t {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-card__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--cool-slate);
}

/* ---------- 赛季时间轴 ---------- */
.page-about .about-timeline {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0 var(--pad-x) 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(147, 169, 191, 0.4) transparent;
}

.page-about .about-timeline:focus-visible {
  outline: 2px solid var(--signal-orange);
  outline-offset: -2px;
}

.page-about .about-timeline__track {
  display: flex;
  gap: 14px;
  width: max-content;
  padding: 4px 0 6px;
}

.page-about .about-node {
  display: flex;
  flex-direction: column;
  flex: 0 0 268px;
  width: 268px;
  padding: 20px 18px 24px;
  background: rgba(8, 37, 28, 0.62);
  border: 1px solid rgba(147, 169, 191, 0.28);
  border-top: 3px solid var(--wine-800);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  border-color: rgba(255, 107, 26, 0.6);
  border-top-color: var(--signal-orange);
  background: rgba(255, 107, 26, 0.07);
}

.page-about .about-node__k {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--warning-yellow);
}

.page-about .about-node__t {
  margin: 12px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-node__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--cool-slate);
}

.page-about .about-figure--timeline {
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-figure--timeline figcaption {
  color: rgba(241, 244, 241, 0.72);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(44px, 6vw, 84px) 0;
  background: var(--charcoal-900);
  border-top: 1px solid var(--about-hair);
}

.page-about .about-cta__k {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--signal-orange);
}

.page-about .about-cta__title {
  margin: 0 0 clamp(22px, 3vw, 34px);
  font-size: clamp(25px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--paper);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-grid {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 52px);
  }

  .page-about .about-side {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 0 0 0 18px;
    border-top: 0;
    border-left: 1px dashed rgba(147, 169, 191, 0.42);
  }

  .page-about .about-side__num {
    font-size: 30px;
  }

  .page-about .about-side__label {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
  }
}

@media (min-width: 960px) {
  .page-about .about-sources {
    grid-template-columns: 7fr 5fr;
    gap: clamp(24px, 3vw, 44px);
  }
}

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

  .page-about .about-timeline {
    padding-left: max(var(--pad-x), calc((100% - 1440px) / 2 + var(--pad-x)));
    padding-right: max(var(--pad-x), calc((100% - 1440px) / 2 + var(--pad-x)));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-source,
  .page-about .about-card,
  .page-about .about-node,
  .page-about .about-step,
  .page-about .breadcrumb a,
  .page-about .about-body a {
    transition: none;
  }
}