.page-about {
  --about-gold-soft: rgba(232, 184, 75, 0.16);
  --about-cyan-soft: rgba(51, 214, 192, 0.12);
  position: relative;
  background: var(--color-bg);
  color: var(--color-text);
  overflow: hidden;
}

/* 通用章节头部 */
.page-about .about-head {
  position: relative;
  margin-bottom: clamp(28px, 5vw, 56px);
  padding-left: 24px;
  border-left: 4px solid var(--color-gold);
}
.page-about .about-head__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-gold);
  letter-spacing: 0.2em;
  margin-bottom: 8px;
}
.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
}
.page-about .container {
  padding: 0 var(--side-pad);
}
.page-about a {
  color: var(--color-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration) var(--ease);
}
.page-about a:hover {
  border-bottom-color: var(--color-gold);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  padding: 32px var(--side-pad) 56px;
  background: linear-gradient(135deg, var(--color-bg) 0%, #12263A 100%);
  overflow: hidden;
  border-bottom: 1px solid var(--color-line);
}
.page-about .about-hero::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 46%;
  height: 100%;
  background: repeating-linear-gradient(-55deg, transparent 0 12px, rgba(232, 184, 75, 0.07) 12px 24px);
  pointer-events: none;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  max-width: calc(var(--container-w) - var(--side-pad) * 2);
  margin: 0 auto;
}
.page-about .about-hero__breadcrumb {
  margin-bottom: 24px;
}
.page-about .about-hero__breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}
.page-about .about-hero__breadcrumb li[aria-current="page"] {
  color: var(--color-gold);
}
.page-about .about-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--color-cyan);
  margin: 0 0 14px;
  text-transform: uppercase;
}
.page-about .about-hero__text h1 {
  margin: 0 0 22px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.7rem, 4vw, 3rem);
  line-height: 1.16;
  letter-spacing: -0.03em;
}
.page-about .about-hero__lead {
  position: relative;
  margin: 0 0 26px;
  padding-left: 18px;
  border-left: 3px solid var(--color-gold);
}
.page-about .about-hero__lead p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-muted);
  max-width: 60ch;
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 28px;
}
.page-about .about-hero__scope {
  color: var(--color-muted);
  font-size: 0.85rem;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-hero__visual {
  position: relative;
  margin-top: 8px;
  text-align: right;
}
.page-about .about-hero__anchor {
  position: relative;
  display: inline-block;
  z-index: 3;
  margin-bottom: -0.16em;
}
.page-about .about-hero__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 200;
  font-size: clamp(5.5rem, 16vw, 12rem);
  line-height: 0.9;
  letter-spacing: -0.06em;
  color: rgba(232, 184, 75, 0.24);
  -webkit-text-stroke: 1px rgba(232, 184, 75, 0.36);
  position: relative;
  z-index: 1;
  text-shadow: 0 0 60px rgba(232, 184, 75, 0.18);
}
.page-about .about-hero__season {
  display: inline-block;
  background: var(--color-gold);
  color: var(--color-bg);
  font-weight: 800;
  font-size: clamp(0.92rem, 1.6vw, 1.15rem);
  letter-spacing: 0.3em;
  padding: 6px 20px 6px 24px;
  position: relative;
  z-index: 4;
  margin-right: 6%;
  border-radius: 2px;
}
.page-about .about-hero__img {
  width: 100%;
  height: auto;
  max-width: 620px;
  display: block;
  margin: 0 0 0 auto;
  clip-path: polygon(0 0, 100% 5%, 94% 100%, 6% 95%);
  object-fit: cover;
}

/* ===== 01 平台定位 ===== */
.page-about .about-locate {
  padding: clamp(48px, 8vw, 96px) 0;
  border-top: 1px solid var(--color-line);
}
.page-about .about-locate__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}
.page-about .about-locate__text {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--color-muted);
}
.page-about .about-locate__text p:first-of-type {
  font-size: 1.05rem;
  color: var(--color-text);
  font-weight: 500;
}
.page-about .about-locate__text p + p {
  margin-top: 18px;
}
.page-about .about-locate__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.page-about .about-locate-card {
  background: var(--color-panel);
  padding: 26px 24px;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  border-top: 2px solid var(--color-gold);
}
.page-about .about-locate-card__num {
  font-family: var(--font-mono);
  font-size: 2.6rem;
  font-weight: 200;
  color: var(--color-gold);
  line-height: 1;
  display: block;
  margin-bottom: 12px;
}
.page-about .about-locate-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 8px;
}
.page-about .about-locate-card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* ===== 02 成长时间线 ===== */
.page-about .about-timeline {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--color-panel);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  position: relative;
}
.page-about .about-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-cyan) 55%, var(--color-red) 100%);
  opacity: 0.4;
}
.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 36px;
  list-style: none;
}
.page-about .about-timeline__list::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-cyan) 55%, var(--color-red) 100%);
}
.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 44px;
}
.page-about .about-timeline__item:last-child {
  margin-bottom: 0;
}
.page-about .about-timeline__marker {
  position: absolute;
  left: -36px;
  top: 5px;
  width: 20px;
  height: 20px;
  border-radius: 5px;
  transform: rotate(45deg);
  border: 2px solid var(--color-panel);
  box-shadow: 0 0 0 1px var(--color-line);
  transition: box-shadow var(--duration) var(--ease), transform var(--duration) var(--ease);
}
.page-about .about-timeline__item:hover .about-timeline__marker {
  transform: rotate(45deg) scale(1.12);
  box-shadow: 0 0 0 4px rgba(232, 184, 75, 0.2);
}
.page-about .about-timeline__marker--gold {
  background: var(--color-gold);
}
.page-about .about-timeline__marker--red {
  background: var(--color-red);
}
.page-about .about-timeline__marker--cyan {
  background: var(--color-cyan);
}
.page-about .about-timeline__card {
  background: var(--color-bg);
  padding: 24px 22px 22px;
  border-left: 3px solid transparent;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  transition: border-color var(--duration) var(--ease), transform var(--duration) var(--ease);
}
.page-about .about-timeline__item[data-open] .about-timeline__card {
  border-left-color: var(--color-gold);
}
.page-about .about-timeline__item:hover .about-timeline__card {
  transform: translateX(4px);
}
.page-about .about-timeline__period {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-gold);
  background: var(--color-panel);
  padding: 3px 10px;
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}
.page-about .about-timeline__card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
}
.page-about .about-timeline__card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}
.page-about .about-timeline__footnote {
  margin-top: 36px;
  padding: 16px 18px;
  background: var(--color-bg);
  border-left: 3px solid var(--color-cyan);
}
.page-about .about-timeline__footnote .data-text {
  color: var(--color-cyan);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
}
.page-about .about-timeline__footnote p {
  margin: 8px 0 0;
  color: var(--color-muted);
  font-size: 0.88rem;
  line-height: 1.7;
}
.page-about .about-timeline__aside {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.page-about .about-timeline__aside img {
  width: 100%;
  height: auto;
  display: block;
  clip-path: polygon(0 0, 100% 0, 92% 100%, 8% 100%);
  object-fit: cover;
}
.page-about .about-timeline__file-card {
  background: var(--color-bg);
  border-left: 3px solid var(--color-red);
  padding: 20px 18px;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}
.page-about .about-timeline__file-card .data-text {
  color: var(--color-cyan);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}
.page-about .about-timeline__file-card p {
  margin: 10px 0 0;
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===== 03 数据能力与覆盖 ===== */
.page-about .about-coverage {
  padding: clamp(48px, 8vw, 96px) 0;
  border-bottom: 1px solid var(--color-line);
}
.page-about .about-coverage__intro {
  max-width: 760px;
  margin-bottom: 32px;
  padding-left: 16px;
  border-left: 3px solid var(--color-cyan);
}
.page-about .about-coverage__intro p {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.8;
  font-size: 0.95rem;
}
.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about .about-coverage__panel {
  background: var(--color-panel);
  padding: 24px 22px;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}
.page-about .about-coverage__panel h3 {
  font-size: 1.1rem;
  font-weight: 800;
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
  letter-spacing: -0.01em;
}
.page-about .about-coverage__league-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-coverage__league-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-line);
  font-size: 0.95rem;
  color: var(--color-text);
}
.page-about .about-coverage__league-list li:last-child {
  border-bottom: none;
}
.page-about .about-coverage__abbr {
  font-family: var(--font-mono);
  color: var(--color-gold);
  font-weight: 700;
  min-width: 48px;
  font-size: 1rem;
}
.page-about .about-coverage__cat-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.page-about .about-coverage__cat-tag {
  background: var(--color-bg);
  padding: 7px 14px;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--color-cyan);
  border: 1px solid var(--color-line);
  border-radius: 2px;
}
.page-about .about-coverage__note {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.88rem;
  line-height: 1.7;
}
.page-about .about-coverage__visual img {
  width: 100%;
  height: auto;
  clip-path: polygon(0 3%, 100% 0, 97% 100%, 3% 97%);
  object-fit: cover;
  display: block;
}
.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.page-about .about-stat {
  background: var(--color-panel);
  padding: 20px 12px;
  text-align: center;
  border-top: 2px solid var(--color-gold);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}
.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(1.4rem, 4vw, 2rem);
  color: var(--color-gold);
  display: block;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.page-about .about-stat:nth-child(2) .about-stat__num,
.page-about .about-stat:nth-child(3) .about-stat__num {
  color: var(--color-cyan);
}
.page-about .about-stat__label {
  font-size: 0.8rem;
  color: var(--color-muted);
  display: block;
  margin-top: 8px;
  line-height: 1.5;
}

/* ===== 04 内容规范与联系 ===== */
.page-about .about-standard {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--color-panel);
}
.page-about .about-standard__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-about .about-standard__block {
  background: var(--color-bg);
  padding: 28px 24px;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  border-top: 2px solid var(--color-gold);
}
.page-about .about-standard__block h3 {
  margin: 0 0 20px;
  font-size: 1.1rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .about-standard__block h3::before {
  content: '';
  width: 14px;
  height: 14px;
  background: var(--color-gold);
  transform: rotate(45deg);
  flex-shrink: 0;
}
.page-about .about-standard__principles ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-standard__principles li {
  position: relative;
  padding: 10px 0 10px 22px;
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  border-bottom: 1px solid var(--color-line);
}
.page-about .about-standard__principles li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 20px;
  width: 10px;
  height: 10px;
  background: var(--color-gold);
  transform: rotate(45deg);
}
.page-about .about-standard__principles li:last-child {
  border-bottom: none;
}
.page-about .about-standard__note {
  color: var(--color-muted);
  font-size: 0.88rem;
  line-height: 1.7;
  margin: 0 0 20px;
}
.page-about .about-standard__contact-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}
.page-about .about-standard__contact-list li {
  display: flex;
  gap: 12px;
  padding: 9px 0;
  font-size: 0.95rem;
  border-bottom: 1px dashed var(--color-line);
}
.page-about .about-standard__contact-list .label {
  color: var(--color-muted);
  min-width: 76px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding-top: 3px;
}
.page-about .about-standard__contact-list .value {
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  word-break: break-all;
}
.page-about .about-standard__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ===== 桌面断点 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: clamp(40px, 8vh, 72px);
    padding-bottom: clamp(56px, 10vh, 96px);
  }
  .page-about .about-hero__inner {
    grid-template-columns: 7fr 5fr;
    align-items: center;
    gap: 48px;
  }
  .page-about .about-hero__visual {
    margin: 0;
  }
  .page-about .about-hero__year {
    font-size: clamp(8rem, 13vw, 14rem);
  }
  .page-about .about-hero__img {
    max-width: 620px;
  }
  .page-about .about-locate__grid {
    grid-template-columns: 1.2fr 1fr;
    gap: 64px;
  }
  .page-about .about-locate__cards {
    grid-template-columns: 1fr 1fr;
    align-content: start;
  }
  .page-about .about-timeline__grid {
    grid-template-columns: 3fr 2fr;
    gap: 48px;
    align-items: start;
  }
  .page-about .about-timeline__aside {
    position: sticky;
    top: 96px;
  }
  .page-about .about-coverage__grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
  .page-about .about-coverage__stats {
    grid-column: 1 / -1;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 8px;
  }
  .page-about .about-standard__grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.1fr 0.9fr;
  }
  .page-about .about-hero__lead p {
    font-size: 1.05rem;
  }
  .page-about .about-locate-card {
    padding: 30px 28px;
  }
  .page-about .about-timeline__grid {
    grid-template-columns: 3.2fr 1.8fr;
    gap: 72px;
  }
  .page-about .about-timeline__list {
    padding-left: 44px;
  }
  .page-about .about-timeline__marker {
    left: -44px;
    width: 22px;
    height: 22px;
  }
  .page-about .about-coverage__grid {
    grid-template-columns: 1fr 1fr 0.9fr;
  }
  .page-about .about-coverage__stats {
    grid-column: 1 / -1;
    grid-template-columns: repeat(6, 1fr);
  }
  .page-about .about-standard__block {
    padding: 36px 32px;
  }
}