/* ===== 站点介绍 · 回顾展 ===== */
.page-about {
  --about-gap: clamp(1.25rem, 3vw, 2.5rem);
  --about-ink-soft: rgba(242, 237, 224, 0.76);
  position: relative;
  display: block;
  overflow-x: clip;
  color: var(--cream);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 70% at 88% -8%, rgba(47, 227, 234, 0.12), transparent 62%),
    radial-gradient(90% 60% at 4% 46%, rgba(255, 62, 154, 0.07), transparent 66%);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-about .about-section {
  padding-block: clamp(2.5rem, 6.5vw, 5.5rem);
}

/* 面包屑 */
.page-about .breadcrumb {
  padding-top: clamp(1rem, 2.5vw, 1.75rem);
  font-size: 0.82rem;
  color: var(--steel);
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: rgba(147, 162, 188, 0.55);
}
.page-about .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  text-decoration: underline;
}

/* 展签小字 */
.page-about .tick-label {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--steel);
}

/* 章节头 */
.page-about .about-head {
  max-width: 46rem;
}
.page-about .about-head h2 {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.4vw, 2.4rem);
  line-height: 1.14;
  letter-spacing: 0.015em;
  color: var(--cream);
}
.page-about .about-head__lede {
  margin: 0.9rem 0 0;
  max-width: 42rem;
  color: var(--about-ink-soft);
  font-size: clamp(0.95rem, 2.2vw, 1.0625rem);
}

/* 图片容器 */
.page-about .media-frame {
  position: relative;
  margin: 0;
  background: none;
  border: 0;
}
.page-about .media-scan {
  position: relative;
  display: block;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.page-about .media-scan::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(180deg, rgba(6, 10, 19, 0.24) 0 1px, transparent 1px 6px);
  pointer-events: none;
}
.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-dark);
  object-fit: cover;
  filter: saturate(0.78) contrast(1.04);
}
.page-about .media-frame__caption {
  margin-top: 0.7rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--orange);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--steel);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.25rem, 3.5vw, 2.5rem) clamp(2.5rem, 7vw, 5.5rem);
}
.page-about .about-hero__shape {
  position: absolute;
  top: -16%;
  right: -18%;
  width: min(660px, 76vw);
  height: min(540px, 86%);
  background: linear-gradient(140deg, rgba(47, 227, 234, 0.18), rgba(255, 62, 154, 0.1) 58%, transparent);
  clip-path: polygon(16% 0, 100% 0, 100% 88%, 0 100%);
  transform: skewY(-6deg) rotate(-1deg);
  pointer-events: none;
  z-index: 0;
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--about-gap);
}
.page-about .about-hero h1 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 6.2vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: 0.02em;
  color: var(--cream);
}
.page-about .about-hero__intro {
  margin: 1.15rem 0 0;
  max-width: 44ch;
  color: var(--about-ink-soft);
  font-size: clamp(0.95rem, 2.3vw, 1.0625rem);
}
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-fact {
  padding: 0.85rem 1rem 0.95rem;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-md);
  background: rgba(14, 22, 38, 0.62);
}
.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4vw, 1.75rem);
  line-height: 1.1;
  color: var(--cyan);
}
.page-about .about-fact__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--steel);
}

/* 赛季时间轴 */
.page-about .about-timeline {
  margin-top: clamp(1.75rem, 4.5vw, 3rem);
  overflow-x: auto;
  padding-bottom: 0.5rem;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-timeline__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 220px;
  gap: 0;
  min-width: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-timeline__node {
  position: relative;
  padding: 2.9rem 1.25rem 0 0;
}
.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  top: 1rem;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--line-dark);
}
.page-about .about-timeline__node::after {
  content: "";
  position: absolute;
  top: 0.42rem;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--orange);
}
.page-about .about-timeline__node:last-child::after {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(47, 227, 234, 0.16);
}
.page-about .about-timeline__season {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--orange);
}
.page-about .about-timeline__node:last-child .about-timeline__season {
  color: var(--cyan);
}
.page-about .about-timeline__title {
  margin: 0.55rem 0 0;
  font-family: var(--font-display);
  font-size: 1rem;
  line-height: 1.4;
  color: var(--cream);
}
.page-about .about-timeline__text {
  margin: 0.45rem 0 0;
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--steel);
}
.page-about .about-track__figure {
  margin-top: clamp(1.75rem, 4.5vw, 3rem);
  max-width: 900px;
}

/* 三条主线 */
.page-about .about-switch {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.35rem;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-pill);
  background: rgba(14, 22, 38, 0.72);
  width: fit-content;
  max-width: 100%;
}
.page-about .about-switch .segmented__btn {
  min-height: 44px;
  padding: 0 1.1rem;
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--steel);
  font-family: var(--font-body);
  font-size: 0.92rem;
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-about .about-switch .segmented__btn:hover {
  color: var(--cream);
}
.page-about .about-switch .segmented__btn[aria-selected="true"] {
  background: var(--magenta);
  color: var(--ink-950);
  font-weight: 600;
}
.page-about .about-switch .segmented__btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.page-about .about-panels {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}
.page-about .about-panel {
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, rgba(20, 31, 51, 0.9), rgba(6, 10, 19, 0.72));
  padding: clamp(1.35rem, 4vw, 2.25rem);
}
.page-about .about-panel + .about-panel {
  margin-top: 1rem;
}
.page-about .about-panel__lede {
  margin: 0;
  max-width: 42rem;
  font-family: var(--font-display);
  font-size: clamp(0.98rem, 2.4vw, 1.12rem);
  line-height: 1.55;
  letter-spacing: 0.01em;
  color: var(--cream);
}
.page-about .about-panel__list {
  display: grid;
  gap: 0.7rem;
  margin: 1.1rem 0 1.4rem;
  padding: 0;
  list-style: none;
}
.page-about .about-panel__list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.93rem;
  line-height: 1.7;
  color: var(--about-ink-soft);
}
.page-about .about-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.65rem;
  height: 2px;
  background: var(--cyan);
}

/* 团队 */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: clamp(1.75rem, 4.5vw, 2.75rem);
}
.page-about .about-team__stat {
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 3vw, 1.9rem);
  background: linear-gradient(165deg, rgba(14, 22, 38, 0.95), rgba(6, 10, 19, 0.6));
}
.page-about .about-team__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 9vw, 4rem);
  line-height: 1;
  color: var(--cyan);
}
.page-about .about-team__stat-label {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--cream);
}
.page-about .about-team__stat-note {
  margin: 0.7rem 0 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--steel);
}
.page-about .about-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-team__item {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1.1rem 0 1.2rem;
  border-top: 1px solid var(--line-dark);
}
.page-about .about-team__item:last-child {
  border-bottom: 1px solid var(--line-dark);
}
.page-about .about-team__index {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--orange);
  padding-top: 0.25rem;
}
.page-about .about-team__role {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.08rem;
  letter-spacing: 0.01em;
  color: var(--cream);
}
.page-about .about-team__desc {
  margin: 0.35rem 0 0;
  max-width: 48ch;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

/* 校园共建（奶油翻转面） */
.page-about .about-club__panel {
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 4.5vw, 3rem);
  background: var(--cream);
  color: var(--ink-on-cream);
}
.page-about .about-club__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}
.page-about .about-club__panel .tick-label {
  color: var(--orange);
}
.page-about .about-club__panel h2 {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4.2vw, 2.1rem);
  line-height: 1.18;
  color: var(--ink-on-cream);
}
.page-about .about-club__lede {
  margin: 0.9rem 0 0;
  max-width: 40ch;
  font-size: 0.97rem;
  line-height: 1.7;
  color: rgba(17, 23, 34, 0.78);
}
.page-about .about-club__list {
  display: grid;
  gap: 0.6rem;
  margin: 1.1rem 0 1.5rem;
  padding: 0;
  list-style: none;
}
.page-about .about-club__list li {
  position: relative;
  padding-left: 1.4rem;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(17, 23, 34, 0.84);
}
.page-about .about-club__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 0.7rem;
  height: 2px;
  background: var(--magenta);
}
.page-about .about-club__figure .media-frame__img {
  border-color: var(--cream-line);
  filter: none;
}
.page-about .about-club__figure .media-scan::after {
  background-image: repeating-linear-gradient(180deg, rgba(17, 23, 34, 0.07) 0 1px, transparent 1px 7px);
}
.page-about .about-club__figure .media-frame__caption {
  border-left-color: var(--orange);
  color: rgba(17, 23, 34, 0.6);
}
.page-about .about-club__link {
  color: var(--ink-on-cream);
  border-color: rgba(17, 23, 34, 0.3);
}
.page-about .about-club__link:hover,
.page-about .about-club__link:focus-visible {
  border-color: var(--magenta);
  color: var(--magenta);
}

/* 更新节奏 */
.page-about .about-rhythm__grid {
  display: grid;
  gap: 1rem;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-rhythm__item {
  position: relative;
  overflow: hidden;
  padding: 1.5rem 1.25rem 1.6rem;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
  background: var(--panel-800);
}
.page-about .about-rhythm__item::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--cyan);
}
.page-about .about-rhythm__item--daily::before {
  background: var(--orange);
}
.page-about .about-rhythm__item--window::before {
  background: var(--yellow);
}
.page-about .about-rhythm__freq {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
}
.page-about .about-rhythm__item--daily .about-rhythm__freq {
  color: var(--orange);
}
.page-about .about-rhythm__item--window .about-rhythm__freq {
  color: var(--yellow);
}
.page-about .about-rhythm__item h3 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1.4;
  color: var(--cream);
}
.page-about .about-rhythm__item p {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--about-ink-soft);
}

/* 收束 */
.page-about .about-outro {
  padding-bottom: clamp(3rem, 8vw, 6rem);
}
.page-about .about-outro__inner {
  display: grid;
  gap: 1.25rem;
  border-top: 1px solid var(--line-dark);
  padding-top: clamp(1.75rem, 4vw, 2.75rem);
}
.page-about .about-outro__text {
  margin: 0;
  max-width: 44ch;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.6vw, 1.35rem);
  line-height: 1.5;
  color: var(--cream);
}
.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}
.page-about .about-outro__actions .btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 1.25rem;
  border-radius: var(--radius-pill);
  text-decoration: none;
  font-size: 0.9rem;
}

/* 平板及以上 */
@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-rhythm__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
  .page-about .about-outro__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2rem;
  }
}

/* 桌面端双栏 */
@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    gap: clamp(2rem, 4.5vw, 4rem);
  }
  .page-about .about-timeline {
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-timeline__track {
    grid-auto-columns: minmax(0, 1fr);
  }
  .page-about .about-timeline__node {
    padding-right: 1.5rem;
  }
  .page-about .about-timeline__node:last-child {
    padding-right: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(240px, 0.8fr) minmax(0, 1.6fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }
  .page-about .about-club__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }
}

/* 低配与降级 */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}