.page-about {
  --about-section-pad: clamp(4rem, 9vw, 8rem) 0;
  --about-chapter-gap: clamp(2.5rem, 6vw, 5rem);
  --about-hero-pad-top: clamp(3rem, 8vw, 6.5rem);
  background: var(--color-bg);
  color: var(--color-cream);
}

.page-about h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4.6vw, 3.75rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: 0;
  color: var(--color-cream);
}

.page-about h3 {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-cream);
}

.page-about figure {
  margin: 0;
}

.page-about figure img,
.page-about .about-timeline-seasonband img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== Hero 首屏 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: var(--about-hero-pad-top) 0 clamp(5rem, 10vw, 7.5rem);
  background:
    linear-gradient(120deg, rgba(201, 162, 39, 0.14), transparent 42%),
    linear-gradient(160deg, var(--color-pitch) 0%, var(--color-bg) 56%, var(--color-bg) 100%);
  border-bottom: 2px solid var(--color-gold);
}

.page-about .about-hero-layout {
  display: grid;
  gap: var(--space-2xl);
}

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

.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  font-size: var(--text-sm);
  color: var(--color-moss-gray);
}

.page-about .about-crumb a {
  color: var(--color-moss-gray);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus {
  color: var(--color-gold);
}

.page-about .about-hero-main h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 9vw, 6.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 0.96;
  color: var(--color-cream);
  max-width: 8ch;
}

.page-about .about-hero-hl {
  display: block;
  color: var(--color-gold);
}

.page-about .about-hero-lead {
  margin: var(--space-lg) 0 var(--space-lg);
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-gold);
}

.page-about .about-hero-desc {
  max-width: 54ch;
  margin: 0 0 var(--space-xl);
  color: var(--color-moss-gray);
  font-size: var(--text-base);
  line-height: 1.75;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.page-about .about-hero-actions .btn {
  text-decoration: none;
}

.page-about .about-hero-side {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  min-width: 0;
}

.page-about .about-hero-data {
  padding: var(--space-xl);
  background: var(--color-ink);
  border: 1px solid var(--color-border);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .about-hero-years {
  margin: var(--space-md) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-gold);
}

.page-about .about-hero-data p:last-child {
  margin: var(--space-sm) 0 0;
  color: var(--color-moss-gray);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.page-about .about-hero-index {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-lg);
}

.page-about .about-hero-index a {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-moss-gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.page-about .about-hero-index a:hover,
.page-about .about-hero-index a:focus {
  color: var(--color-gold);
  border-color: var(--color-gold);
}

.page-about .about-hero-band {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.55rem 0;
  background: var(--color-gold);
  color: var(--color-bg);
  transform: skewY(-1.4deg) translateY(7px) scale(1.02);
  transform-origin: left center;
  white-space: nowrap;
  overflow: hidden;
}

.page-about .about-hero-band span {
  display: inline-block;
  padding-left: var(--container-pad);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.14em;
}

/* ===== 章节通用 ===== */
.page-about .about-section {
  padding: var(--about-section-pad);
}

.page-about .about-section.about-audience {
  background: var(--color-pitch);
}

.page-about .about-chapter-head {
  display: grid;
  gap: var(--space-xl);
  margin-bottom: var(--about-chapter-gap);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}

.page-about .about-chapter-index {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.page-about .about-chapter-num {
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: clamp(3.6rem, 7vw, 6rem);
  line-height: 0.85;
  letter-spacing: -0.05em;
  color: var(--color-moss-gray);
}

.page-about .about-chapter-line {
  width: clamp(2rem, 5vw, 4rem);
  height: 1px;
  background: var(--color-gold);
  opacity: 0.55;
}

.page-about .about-chapter-title h2 {
  margin-bottom: var(--space-md);
}

.page-about .about-chapter-sub {
  margin: 0;
  max-width: 46em;
  color: var(--color-moss-gray);
  font-size: var(--text-base);
  line-height: 1.65;
}

/* ===== 01 球王会是什么 ===== */
.page-about .about-what-grid {
  display: grid;
  gap: var(--space-2xl);
  align-items: start;
}

.page-about .about-what-copy {
  min-width: 0;
}

.page-about .about-what-copy > p {
  margin: 0 0 var(--space-lg);
  color: var(--color-moss-gray);
  font-size: var(--text-base);
  line-height: 1.75;
}

.page-about .about-what-copy > p:first-child {
  color: var(--color-cream);
  font-size: var(--text-lg);
}

.page-about .about-what-pillars {
  display: grid;
  gap: 0;
  margin-top: var(--space-2xl);
  border-top: 1px solid var(--color-border);
}

.page-about .about-pillar {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.page-about .about-pillar-sn {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-gold);
}

.page-about .about-pillar h3 {
  margin: var(--space-sm) 0;
}

.page-about .about-pillar h3 a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--color-border-gold);
}

.page-about .about-pillar h3 a:hover,
.page-about .about-pillar h3 a:focus {
  color: var(--color-gold);
}

.page-about .about-pillar p {
  margin: 0;
  color: var(--color-moss-gray);
  font-size: var(--text-sm);
  line-height: 1.75;
}

.page-about .about-what-fig {
  min-width: 0;
  order: -1;
}

.page-about .about-what-fig img {
  width: 100%;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-about .about-what-fig figcaption {
  margin-top: var(--space-sm);
}

/* ===== 02 数据不缺席 ===== */
.page-about .about-prod-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--color-ink);
  border: 1px solid var(--color-border);
}

.page-about .about-stat {
  position: relative;
  padding: var(--space-xl) var(--space-lg);
}

.page-about .about-stat::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 26px;
  height: 3px;
  background: var(--color-gold);
}

.page-about .about-stat:nth-child(n + 3) {
  border-top: 1px solid var(--color-border);
}

.page-about .about-stat:nth-child(even) {
  border-left: 1px solid var(--color-border);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-gold);
}

.page-about .about-stat-num span {
  margin-left: 0.1em;
  font-size: 0.45em;
  font-weight: 500;
  color: var(--color-moss-gray);
}

.page-about .about-stat-label {
  display: block;
  margin-top: var(--space-md);
  color: var(--color-moss-gray);
  font-size: var(--text-sm);
}

.page-about .about-production-flow {
  display: grid;
  gap: var(--space-2xl);
  margin-top: var(--space-2xl);
}

.page-about .about-flow-text p {
  margin: var(--space-md) 0 0;
  color: var(--color-moss-gray);
  line-height: 1.75;
}

.page-about .about-flow-steps {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin: var(--space-xl) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow-steps li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-lg);
  background: var(--color-pitch);
  color: var(--color-cream);
  font-weight: 600;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 100%);
}

.page-about .about-flow-num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-gold);
}

.page-about .about-update-window {
  padding: var(--space-xl);
  background: var(--color-pitch);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .about-update-rule {
  margin: var(--space-md) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-gold);
}

.page-about .about-update-list {
  margin: var(--space-md) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-update-list li {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px dashed rgba(201, 162, 39, 0.2);
}

.page-about .about-update-list .tag {
  min-width: 3.6em;
  text-align: center;
}

.page-about .about-update-special {
  margin: var(--space-md) 0 0;
  color: var(--color-moss-gray);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* ===== 03 发展历程 ===== */
.page-about .about-timeline-lede {
  display: grid;
  gap: var(--space-2xl);
}

.page-about .about-timeline-fig img {
  width: 100%;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-about .about-timeline-fig figcaption {
  margin-top: var(--space-sm);
}

.page-about .about-timeline-grid {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-border-gold);
}

.page-about .about-version {
  position: relative;
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--dur-base) var(--ease-out), padding var(--dur-base) var(--ease-out);
}

.page-about .about-version:hover,
.page-about .about-version:focus-within {
  background: rgba(201, 162, 39, 0.04);
}

.page-about .about-ver-top {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.page-about .about-ver-season {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 3.4vw, 2.8rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-gold);
}

.page-about .about-ver-name {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-cream);
}

.page-about .about-version h3 {
  margin-top: var(--space-md);
}

.page-about .about-version p {
  margin: var(--space-sm) 0 0;
  color: var(--color-moss-gray);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.page-about .about-timeline-seasonband {
  margin-top: var(--space-2xl);
  overflow: hidden;
}

.page-about .about-timeline-seasonband img {
  width: 100%;
}

/* ===== 04 我们为谁服务 ===== */
.page-about .about-section.about-audience .about-chapter-sub {
  color: rgba(244, 239, 230, 0.72);
}

.page-about .about-audience-list {
  display: grid;
  gap: 0;
}

.page-about .about-aud-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md) var(--space-lg);
  align-items: start;
  padding: var(--space-xl) 0;
  border-bottom: 1px solid rgba(244, 239, 230, 0.18);
}

.page-about .about-aud-num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1;
  color: var(--color-gold);
  padding-top: 0.18em;
}

.page-about .about-aud-item h3 {
  margin-bottom: var(--space-sm);
}

.page-about .about-aud-item p {
  margin: 0;
  color: rgba(244, 239, 230, 0.74);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.page-about .about-aud-tag {
  grid-column: 2;
  justify-self: start;
}

/* ===== 05 联系方式 ===== */
.page-about .about-contact-grid {
  display: grid;
  gap: var(--space-lg);
}

.page-about .about-contact-card {
  background: var(--color-ink);
  border: 1px solid var(--color-border);
  padding: var(--space-2xl);
}

.page-about .about-contact-line {
  margin: var(--space-sm) 0 var(--space-lg);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-gold);
  word-break: break-all;
}

.page-about .about-contact-note {
  margin: var(--space-sm) 0 0;
  color: var(--color-moss-gray);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.page-about .about-contact-addr {
  margin: var(--space-sm) 0 0;
  color: var(--color-cream);
  font-size: var(--text-base);
  line-height: 1.6;
}

.page-about .about-contact-more {
  margin: var(--space-xl) 0 0;
  padding-left: var(--space-md);
  border-left: 2px solid var(--color-gold);
  color: var(--color-moss-gray);
  line-height: 1.7;
}

.page-about .about-contact-more a {
  color: var(--color-gold);
  text-decoration: none;
}

.page-about .about-contact-more a:hover,
.page-about .about-contact-more a:focus {
  text-decoration: underline;
}

.page-about .about-endline {
  height: 2px;
  margin-top: var(--space-3xl);
  background: linear-gradient(90deg, var(--color-gold) 0%, rgba(201, 162, 39, 0.25) 55%, transparent 100%);
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about .about-prod-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stat {
    padding: var(--space-2xl) var(--space-xl);
  }

  .page-about .about-stat:nth-child(n + 3) {
    border-top: 0;
  }

  .page-about .about-stat:nth-child(n + 2) {
    border-left: 1px solid var(--color-border);
  }

  .page-about .about-hero-index {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .about-aud-item {
    grid-template-columns: auto 1fr auto;
    align-items: center;
  }

  .page-about .about-aud-tag {
    grid-column: 3;
    justify-self: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: end;
  }

  .page-about .about-what-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: var(--space-2xl);
  }

  .page-about .about-what-fig {
    order: 2;
    position: sticky;
    top: var(--space-2xl);
    transform: translateY(var(--space-xl));
  }

  .page-about .about-production-flow {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: var(--space-3xl);
  }

  .page-about .about-timeline-lede {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.15fr);
    gap: var(--space-3xl);
  }

  .page-about .about-timeline-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-lg);
    border-top: 2px solid var(--color-gold);
  }

  .page-about .about-version {
    padding: var(--space-xl) 0 var(--space-2xl);
  }

  .page-about .about-version:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -0.6rem;
    width: 18px;
    height: 18px;
    border-top: 2px solid var(--color-gold);
    border-right: 2px solid var(--color-gold);
    transform: rotate(45deg);
    opacity: 0.7;
  }

  .page-about .about-contact-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }

  .page-about .about-what-fig {
    transform: none;
  }
}