/* ============ page-about : 站点介绍 ============ */

.page-about {
  display: block;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  border-bottom: 2px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  width: clamp(44px, 8vw, 132px);
  background: var(--panel);
  clip-path: polygon(62% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  padding-block: clamp(2.25rem, 6vw, 4.5rem) clamp(2rem, 5vw, 3.75rem);
}

.page-about .about-hero__title {
  margin-top: 0.85rem;
  font-size: clamp(2.25rem, 8vw, 4.6rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 68px;
  height: 6px;
  margin-top: 1.15rem;
  background: var(--orange);
}

.page-about .about-hero__side .lede {
  max-width: 44ch;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 1.75rem 0 0;
  border-top: 2px solid var(--line);
  border-left: 2px solid var(--line);
}

.page-about .about-hero__facts > div {
  padding: 0.75rem 0.6rem;
  border-right: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  min-width: 0;
}

.page-about .about-hero__facts dt {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-hero__facts dd {
  margin: 0.35rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(0.9375rem, 2.2vw, 1.125rem);
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ---------- 通用区块 ---------- */

.page-about .about-block {
  padding-block: clamp(2.5rem, 6vw, 4.75rem);
  border-top: 2px solid var(--line);
}

.page-about .about-block:first-of-type {
  border-top: 0;
}

.page-about .about-block .index-bar {
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

/* ---------- 01 定位 ---------- */

.page-about .about-position {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .about-position__claim {
  border: 2px solid var(--line);
  border-top: 6px solid var(--orange);
  background: var(--panel);
  padding: clamp(1.25rem, 3vw, 1.85rem);
  box-shadow: var(--shadow-hard);
}

.page-about .about-position__kicker {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-position__value {
  margin-top: 0.6rem;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--white);
}

.page-about .about-position__note {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.7;
}

.page-about .about-position__list {
  margin: 1.35rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-position__list li {
  padding: 0.6rem 0 0.6rem 1.15rem;
  position: relative;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--white);
  border-bottom: 1px solid var(--line);
}

.page-about .about-position__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 8px;
  height: 8px;
  background: var(--lime);
}

.page-about .about-position__body p + p {
  margin-top: 1.1rem;
}

/* ---------- 02 架构剖面 ---------- */

.page-about .about-arch__grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-arch__figure {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-about .about-arch__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-arch__figure .media-frame__cap {
  padding: 0.6rem 0.85rem;
  border-top: 1px solid var(--line);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-arch__stack {
  display: grid;
  gap: 10px;
}

.page-about .layer {
  border: 2px solid var(--line);
  border-left-width: 8px;
  background: var(--panel);
  padding: clamp(1rem, 2.4vw, 1.5rem);
  transition: opacity 0.25s var(--ease), background-color 0.25s var(--ease);
}

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

.page-about .layer--1 { border-left-color: var(--orange); }
.page-about .layer--2 { border-left-color: var(--blue); }
.page-about .layer--3 { border-left-color: var(--panel-2); }

.page-about .about-arch__stack:has(.layer:hover) .layer:not(:hover),
.page-about .about-arch__stack:has(.layer:focus-visible) .layer:not(:focus-visible) {
  opacity: 0.35;
}

.page-about .layer:hover {
  background: var(--panel-2);
}

.page-about .layer__head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.page-about .layer__no {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--orange);
  flex: 0 0 auto;
}

.page-about .layer__name {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .layer__desc {
  margin-top: 0.7rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 52ch;
}

.page-about .layer__fields {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.95rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .layer__fields li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.32rem 0.55rem;
  border: 1px solid var(--line);
  background: var(--ink);
  color: var(--white);
  white-space: nowrap;
}

/* ---------- 03 赛季沿革 ---------- */

.page-about .about-era__bandwrap {
  margin: 0;
  border-block: 2px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-era__bandwrap img {
  display: block;
  width: 100%;
  height: clamp(104px, 15vw, 190px);
  object-fit: cover;
}

.page-about .era-track {
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  padding-top: 22px;
  padding-bottom: 0.5rem;
  margin-top: clamp(1.25rem, 3vw, 2rem);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .era-node {
  position: relative;
  flex: 0 0 auto;
  width: clamp(140px, 17vw, 184px);
  padding: 26px 0.85rem 1rem 0;
  text-decoration: none;
  color: var(--white);
  transition: background-color 0.2s var(--ease);
}

.page-about .era-node::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--line);
}

.page-about .era-node__box {
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  background: var(--panel-2);
  border: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  line-height: 1;
  color: var(--muted);
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .era-node:hover,
.page-about .era-node:focus-visible {
  background: var(--panel);
  outline: none;
}

.page-about .era-node:hover .era-node__box,
.page-about .era-node:focus-visible .era-node__box {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .era-node__label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.page-about .era-node__note {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .era-panels {
  margin-top: clamp(1.25rem, 3vw, 2rem);
  border: 2px solid var(--line);
  border-left: 6px solid var(--orange);
  background: var(--panel);
}

.page-about .era-panel {
  display: none;
  padding: clamp(1.25rem, 3vw, 2rem);
}

.page-about .era-panel:first-child {
  display: block;
}

.page-about .era-panel:target {
  display: block;
}

.page-about .era-panels:has(:target) .era-panel:first-child:not(:target) {
  display: none;
}

.page-about .era-panel__tag {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .era-panel__title {
  margin-top: 0.5rem;
  font-size: clamp(1.25rem, 3.4vw, 1.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--white);
}

.page-about .era-panel .prose {
  margin-top: 0.9rem;
  max-width: 58ch;
}

.page-about .era-panel__fields {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .era-panel__fields li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.32rem 0.6rem;
  border: 1px solid var(--line);
  background: var(--ink);
  color: var(--lime);
  white-space: nowrap;
}

/* ---------- 04 口径 ---------- */

.page-about .about-rules__list .collapse + .collapse {
  margin-top: 10px;
}

.page-about .about-rules__item {
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-about .about-rules__item .collapse__head {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  padding: 1rem 1.15rem;
  background: transparent;
  border: 0;
  color: var(--white);
  text-align: left;
  cursor: pointer;
  font: inherit;
  transition: background-color 0.2s var(--ease);
}

.page-about .about-rules__item .collapse__head:hover {
  background: var(--panel-2);
}

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

.page-about .collapse__title {
  flex: 1 1 auto;
  font-size: clamp(1rem, 2.2vw, 1.125rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-rules__item .collapse__sign {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-rules__item .collapse__body {
  padding: 0 1.15rem 1.15rem;
  border-top: 1px solid var(--line);
}

.page-about .about-rules__item .collapse__body p {
  margin-top: 1rem;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 05 场馆档案 ---------- */

.page-about .about-venue__grid {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .about-venue__caption {
  padding: 0 0 0.75rem;
  text-align: left;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-venue__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.page-about .about-venue__table th,
.page-about .about-venue__table td {
  padding: 0.8rem 0.85rem;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  line-height: 1.65;
}

.page-about .about-venue__table thead th {
  background: var(--panel-2);
  color: var(--white);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.page-about .about-venue__table tbody th {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--white);
  white-space: nowrap;
  background: var(--panel);
}

.page-about .about-venue__table tbody td {
  color: var(--muted);
}

.page-about .about-venue__table tbody tr:last-child td {
  color: var(--lime);
}

.page-about .about-venue__sample {
  border: 2px solid var(--line);
  border-top: 6px solid var(--blue);
  background: var(--panel);
  padding: clamp(1.25rem, 3vw, 1.85rem);
}

.page-about .about-venue__sample-title {
  margin-top: 0.5rem;
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-venue__sample p {
  margin-top: 0.9rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-venue__disclaimer {
  font-size: 0.8125rem;
  color: var(--dim);
}

.page-about .about-venue__sample .btn {
  margin-top: 1.25rem;
}

/* ---------- 06 工作方式 ---------- */

.page-about .about-work__grid {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-work__figure {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-about .about-work__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-work__figure .media-frame__cap {
  padding: 0.6rem 0.85rem;
  border-top: 1px solid var(--line);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-work__body p + p {
  margin-top: 1.1rem;
}

.page-about .about-work__chain {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 1.1rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-work__chain li {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.9rem;
  background: var(--panel-2);
  border: 2px solid var(--line);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--white);
  white-space: nowrap;
}

.page-about .about-work__chain li + li::before {
  content: "→";
  position: absolute;
  left: -0.95rem;
  color: var(--orange);
  font-family: var(--font-mono);
}

.page-about .about-work__no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--orange);
}

/* ---------- 07 纠错通道 ---------- */

.page-about .about-fix__grid {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .about-fix__grid .prose {
  max-width: 58ch;
}

.page-about .about-fix__steps {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-about .about-fix__steps li {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-fix__steps li:last-child {
  border-bottom: 0;
}

.page-about .about-fix__steps li:first-child {
  background: var(--panel-2);
}

.page-about .about-fix__step-no {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  background: var(--panel-2);
  border: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--muted);
}

.page-about .about-fix__steps li:first-child .about-fix__step-no {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .about-fix__step-text {
  font-size: 0.9375rem;
  color: var(--white);
}

.page-about .about-fix__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .about-fix__status {
  margin-top: 1.25rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 图片响应式兜底 ---------- */

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

/* ---------- 桌面端 ---------- */

@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-position {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-arch__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .about-venue__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-work__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .about-fix__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-about .about-arch__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  }

  .page-about .about-era__bandwrap img {
    height: 200px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .layer,
  .page-about .era-node,
  .page-about .era-node__box,
  .page-about .about-rules__item .collapse__head {
    transition-duration: 0.001ms;
  }
}