.page-about {
  --about-gutter: clamp(1rem, 2.5vw, 2.5rem);
  --about-panel-pad: clamp(1.5rem, 4vw, 3.75rem);
  --about-num-size: clamp(3.5rem, 10vw, 7rem);
  background: var(--c-base);
  color: var(--c-text);
  overflow-x: clip;
}

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

.page-about figure {
  margin: 0;
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.5vw, 3.2rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

.page-about h3 {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.4;
  margin: 0 0 0.35rem;
}

.page-about p {
  line-height: 1.8;
}

.page-about a {
  color: inherit;
  text-decoration: none;
}

/* ---------- 面包屑 ---------- */
.page-about__breadcrumbs {
  padding: 1.25rem var(--about-gutter) 0;
}

.page-about__breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-muted);
}

.page-about__breadcrumbs a {
  color: var(--c-muted);
  transition: color 0.3s var(--ease);
}

.page-about__breadcrumbs a:hover {
  color: var(--c-accent);
}

.page-about__breadcrumbs [aria-current="page"] {
  color: var(--c-text);
}

/* ---------- Hero ---------- */
.page-about__hero {
  padding: clamp(1.5rem, 4vw, 3rem) var(--about-gutter) clamp(2.5rem, 6vw, 6rem);
}

.page-about__hero-inner {
  display: grid;
  gap: 1.5rem;
  align-items: start;
}

.page-about__coordinate {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  align-items: center;
  width: fit-content;
  max-width: 100%;
  padding: 0.6rem 0.9rem;
  border: 1px solid rgba(166, 179, 200, 0.28);
  border-left: 3px solid var(--c-accent);
  background: rgba(16, 29, 60, 0.72);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

.page-about__coordinate-item--live {
  color: var(--c-accent);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.page-about__coordinate-item--live::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-accent);
  animation: pageAboutPulse 2.2s var(--ease) infinite;
}

.page-about__kicker {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin: 0 0 1rem;
}

.page-about__hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.9rem, 9vw, 6.4rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin: 0 0 1.5rem;
  max-width: 7em;
}

.page-about__hero-lead {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--c-muted);
  max-width: 34em;
  margin: 0;
}

.page-about__hero-visual {
  position: relative;
  margin: 0;
  background: var(--c-surface);
}

.page-about__hero-visual img {
  display: block;
  width: 100%;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2rem), calc(100% - 2rem) 100%, 0 100%);
}

.page-about__hero-figcaption {
  padding: 0.65rem 1rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--c-accent);
}

/* ---------- 通用章节 / 双画布 ---------- */
.page-about__section {
  position: relative;
  padding: clamp(2rem, 5vw, 5rem) var(--about-gutter);
}

.page-about__section + .page-about__section::after {
  content: "";
  position: absolute;
  top: 0;
  left: var(--about-gutter);
  width: 28%;
  max-width: 16rem;
  height: 4px;
  background: linear-gradient(90deg, var(--c-accent-2), var(--c-accent));
  z-index: 3;
}

.page-about__duo {
  display: grid;
  gap: 1.5rem;
  align-items: start;
}

.page-about__panel {
  position: relative;
  padding: var(--about-panel-pad);
}

.page-about__panel--dark {
  background: linear-gradient(145deg, var(--c-surface) 0%, var(--c-surface-2) 100%);
  color: var(--c-text);
  border-top: 2px solid rgba(200, 255, 0, 0.36);
  border-bottom: 1px solid rgba(0, 224, 255, 0.22);
}

.page-about__panel--paper {
  background: var(--c-paper);
  color: var(--c-base);
  border-bottom: 4px solid var(--c-accent-2);
}

.page-about__panel--dark p {
  color: var(--c-muted);
}

.page-about__panel--paper p {
  color: rgba(10, 17, 40, 0.78);
}

.page-about__section-num {
  font-family: var(--font-display);
  font-size: var(--about-num-size);
  line-height: 0.9;
  margin: 0 0 1.25rem;
  color: transparent;
  -webkit-text-stroke: 1px var(--c-accent);
}

.page-about__section-num--ink {
  -webkit-text-stroke: 1px var(--c-base);
}

.page-about__section-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin: 0 0 0.5rem;
}

.page-about__section-kicker--ink {
  color: var(--c-accent-2);
}

.page-about__quote {
  margin: 2rem 0 0;
  padding: 0.75rem 0 0.75rem 1rem;
  border-left: 3px solid var(--c-accent-2);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--c-data);
}

/* ---------- 侧注 ---------- */
.page-about__side-note {
  margin: 1.25rem 0 0;
  padding-left: 0.6rem;
  border-left: 2px solid var(--c-accent-2);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--c-data);
}

.page-about__panel--paper .page-about__side-note {
  color: var(--c-accent-2);
}

/* ---------- 数据统计 ---------- */
.page-about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.page-about__stat {
  padding-top: 0.75rem;
  border-top: 3px solid var(--c-accent);
}

.page-about__stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 1;
  color: var(--c-accent);
}

.page-about__stat-label {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-muted);
}

/* ---------- 里程碑列表 ---------- */
.page-about__milestone-list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
}

.page-about__milestone-list li {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem 1rem;
  margin: 0 0 1rem;
  padding-left: 1rem;
  border-left: 2px solid rgba(200, 255, 0, 0.32);
  color: var(--c-base);
}

.page-about__milestone-list li::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 0.55rem;
  width: 10px;
  height: 10px;
  background: var(--c-accent-2);
  transform: rotate(45deg);
}

.page-about__milestone-list li span {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--c-accent-2);
}

.page-about__timeline-media {
  background: var(--c-surface);
}

.page-about__timeline-media img {
  display: block;
  width: 100%;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.5rem), calc(100% - 1.5rem) 100%, 0 100%);
}

.page-about__panel-caption {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--c-muted);
}

.page-about__panel-caption--ink {
  color: rgba(10, 17, 40, 0.7);
}

/* ---------- 收录覆盖 ---------- */
.page-about__coverage-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
}

.page-about__coverage-chips li {
  padding: 0.4rem 0.75rem;
  border: 1px solid rgba(200, 255, 0, 0.3);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-accent);
}

.page-about__micro-note {
  margin: 1.5rem 0 0;
  font-size: 0.82rem;
  color: var(--c-muted);
}

.page-about__league-matrix {
  display: grid;
  gap: 1rem;
}

.page-about__league-card {
  padding: 1rem;
  background: rgba(10, 17, 40, 0.04);
  border-left: 3px solid var(--c-accent-2);
}

.page-about__league-tag {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--c-accent-2);
}

.page-about__league-card p {
  margin: 0;
  font-size: 0.9rem;
}

/* ---------- 变更说明 ---------- */
.page-about__change-cols {
  display: grid;
  gap: 1rem;
}

.page-about__change-col {
  position: relative;
  padding: 1rem;
  border: 1px solid rgba(200, 255, 0, 0.24);
  background: rgba(16, 29, 60, 0.55);
}

.page-about__change-col p {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
}

.page-about__change-tag {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--c-accent);
}

.page-about__change-tag--accent {
  color: var(--c-accent-2);
}

.page-about__change-arrow {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  color: var(--c-accent-2);
}

/* ---------- 审核流程 ---------- */
.page-about__review-steps {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
}

.page-about__review-steps li {
  position: relative;
  padding: 0.8rem 0.8rem 0.8rem 3.25rem;
  border-left: 1px solid rgba(200, 255, 0, 0.35);
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about__review-steps li:hover {
  background: rgba(200, 255, 0, 0.07);
  border-left-color: var(--c-accent);
  transform: translateX(0.4rem);
}

.page-about__review-num {
  position: absolute;
  left: 0.75rem;
  top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-accent-2);
}

.page-about__review-steps h3 {
  margin-bottom: 0.2rem;
  color: var(--c-text);
}

.page-about__review-steps p {
  margin: 0;
  font-size: 0.9rem;
}

.page-about__review-visual img {
  display: block;
  width: 100%;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.5rem), calc(100% - 1.5rem) 100%, 0 100%);
}

/* ---------- 收尾 ---------- */
.page-about__closing {
  padding: clamp(2.5rem, 6vw, 6rem) var(--about-gutter);
  background: linear-gradient(135deg, var(--c-surface-2) 0%, var(--c-base) 70%);
  color: var(--c-text);
}

.page-about__closing-inner {
  max-width: 820px;
  margin: 0 auto;
  padding: var(--about-panel-pad);
  border-top: 2px solid var(--c-accent);
  border-bottom: 1px solid rgba(0, 224, 255, 0.25);
}

.page-about__closing-inner > .page-about__section-kicker {
  text-align: center;
}

.page-about__closing-inner h2 {
  text-align: center;
  margin-top: 0.5rem;
}

.page-about__closing .page-about__closing-lead {
  text-align: center;
  color: var(--c-muted);
  max-width: 36em;
  margin: 0 auto;
}

.page-about__closing-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.85rem;
  margin: 2rem 0 1.5rem;
}

.page-about__closing-note {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--c-accent);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 960px) {
  .page-about__hero-inner {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
    column-gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about__coordinate {
    grid-column: 1 / -1;
  }

  .page-about__hero-text {
    grid-column: 1;
  }

  .page-about__hero-visual {
    grid-column: 2;
    margin-top: 2rem;
  }

  .page-about__duo {
    grid-template-columns: repeat(12, 1fr);
    gap: 0;
  }

  .page-about__duo > :first-child {
    grid-column: 1 / 8;
    z-index: 2;
  }

  .page-about__duo > :last-child {
    grid-column: 6 / 13;
    z-index: 1;
    margin-top: clamp(2rem, 5vw, 5rem);
  }

  .page-about__duo--flip > :first-child {
    grid-column: 6 / 13;
    z-index: 1;
    margin-top: clamp(2rem, 5vw, 5rem);
  }

  .page-about__duo--flip > :last-child {
    grid-column: 1 / 8;
    z-index: 2;
    margin-top: 0;
  }

  .page-about__side-note {
    position: absolute;
    top: 2.5rem;
    right: 1rem;
    margin: 0;
    padding: 0 0 0 0.5rem;
    border-left: none;
    border-right: 2px solid var(--c-accent-2);
    writing-mode: vertical-rl;
    max-height: 45%;
    overflow: hidden;
  }

  .page-about__stats {
    gap: 2rem;
  }

  .page-about__league-matrix {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .page-about__change-cols {
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
  }

  .page-about__change-col--wide {
    grid-column: 1 / -1;
  }
}

@keyframes pageAboutPulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(200, 255, 0, 0.6);
  }
  50% {
    box-shadow: 0 0 0 7px rgba(200, 255, 0, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about__coordinate-item--live::before {
    animation: none;
  }

  .page-about__review-steps li {
    transition: none;
  }
}