/* ===== 品牌文化页 · page-about 作用域 ===== */

.page-about {
  display: block;
  background: var(--paper-100);
  color: var(--ink-900);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.page-about a {
  color: inherit;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 22px clamp(20px, 4vw, 48px) 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock-600);
}

.page-about .about-crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--rock-200);
}

.page-about .about-crumbs a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--sand-500);
  border-bottom-color: var(--sand-500);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: clamp(18px, 3vw, 34px) clamp(20px, 4vw, 48px) clamp(36px, 5.5vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -6%;
  bottom: 4%;
  width: 44%;
  height: 58%;
  background: linear-gradient(135deg, rgba(200, 145, 47, 0.13), rgba(200, 145, 47, 0));
  transform: rotate(-2.5deg);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0;
  font-size: clamp(16px, 1.5vw, 17.5px);
  line-height: 1.78;
  color: var(--ink-800);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 2.4vw, 30px);
  margin-top: clamp(24px, 3.2vw, 38px);
  padding-top: clamp(18px, 2.6vw, 28px);
  border-top: 1px solid var(--rock-200);
}

.page-about .fact {
  min-width: 0;
}

.page-about .fact__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 8vw, 52px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sand-500);
  font-variant-numeric: tabular-nums;
}

.page-about .fact__label {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--rock-600);
}

.page-about .about-hero__visual {
  margin: 0;
  position: relative;
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--paper-300);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
}

.page-about .about-hero__visual .fig-cap {
  display: block;
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--sand-500);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock-600);
  line-height: 1.5;
}

/* ---------- 档案双栏 ---------- */
.page-about .archive {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px) clamp(48px, 7vw, 92px);
}

.page-about .archive__rail {
  position: relative;
}

.page-about .archive__rail-label {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--rock-600);
}

.page-about .archive__index {
  list-style: none;
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .archive__index::-webkit-scrollbar {
  display: none;
}

.page-about .archive__index li {
  flex: 0 0 auto;
}

.page-about .archive__index a {
  position: relative;
  display: block;
  padding: 8px 14px;
  text-decoration: none;
  background: var(--paper-300);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background-color 0.22s ease, color 0.22s ease;
}

.page-about .archive__index a::before {
  display: none;
}

.page-about .archive__index a:hover,
.page-about .archive__index a:focus-visible {
  background: var(--sand-300);
}

.page-about .archive__index a.is-active {
  background: var(--ink-900);
}

.page-about .archive__index a.is-active .archive__year,
.page-about .archive__index a.is-active .archive__name {
  color: var(--paper-100);
}

.page-about .archive__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--rock-600);
  line-height: 1.4;
}

.page-about .archive__name {
  display: block;
  margin-top: 2px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-900);
  line-height: 1.4;
  white-space: nowrap;
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding: clamp(28px, 4vw, 46px) 0;
  border-top: 1px solid var(--rock-200);
}

.page-about .chapter:first-child {
  border-top: none;
  padding-top: 4px;
}

.page-about .chapter__title {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 3.2vw, 34px);
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--sand-500);
}

.page-about .chapter p {
  max-width: 68ch;
  margin: 0 0 18px;
}

.page-about .chapter p:last-child {
  margin-bottom: 0;
}

.page-about .chapter .lead {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.1vw, 22px);
  line-height: 1.62;
  color: var(--ink-800);
  margin-bottom: 22px;
}

.page-about .note-line {
  position: relative;
  max-width: 62ch;
  margin: 26px 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--sand-500);
  font-size: 15px;
  line-height: 1.75;
  color: var(--rock-600);
}

/* ---------- 图文 ---------- */
.page-about .chapter__figure {
  margin: clamp(24px, 3.4vw, 40px) 0;
  max-width: 760px;
}

.page-about .chapter__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--paper-300);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .chapter__figure .fig-cap {
  display: block;
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--rock-200);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--rock-600);
}

/* ---------- 工作链条 ---------- */
.page-about .method {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0;
  padding: 0;
}

.page-about .method__step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  column-gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--rock-200);
}

.page-about .method__step:last-child {
  border-bottom: 1px solid var(--rock-200);
}

.page-about .method__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--sand-500);
}

.page-about .method__title {
  grid-column: 2;
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 17.5px;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--ink-900);
}

.page-about .method__step p {
  grid-column: 2;
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-800);
}

/* ---------- 团队面板 ---------- */
.page-about .team-panel {
  margin-top: 8px;
  padding: clamp(26px, 3.8vw, 46px) clamp(22px, 3.2vw, 42px) clamp(30px, 4.2vw, 52px);
  background: var(--ink-900);
  color: var(--paper-100);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: clamp(16px, 2.6vw, 32px);
  margin-bottom: clamp(22px, 3vw, 34px);
  padding-bottom: clamp(20px, 2.6vw, 30px);
  border-bottom: 1px solid rgba(201, 205, 202, 0.22);
}

.page-about .team-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sand-300);
  font-variant-numeric: tabular-nums;
}

.page-about .team-stat__label {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.55;
  letter-spacing: 0.04em;
  color: rgba(244, 237, 225, 0.66);
}

.page-about .team-lead {
  max-width: 64ch;
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(244, 237, 225, 0.84);
}

.page-about .role {
  border-top: 1px solid rgba(201, 205, 202, 0.22);
}

.page-about .role:last-of-type {
  border-bottom: 1px solid rgba(201, 205, 202, 0.22);
}

.page-about .role > summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  list-style: none;
  cursor: pointer;
  transition: color 0.22s ease;
}

.page-about .role > summary::-webkit-details-marker {
  display: none;
}

.page-about .role > summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 15px;
  line-height: 1;
  color: var(--sand-300);
}

.page-about .role[open] > summary::after {
  content: "－";
}

.page-about .role > summary:hover,
.page-about .role > summary:focus-visible {
  color: var(--sand-300);
  outline: none;
}

.page-about .role__name {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.page-about .role__count {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--rock-200);
}

.page-about .role__body {
  margin: 0;
  padding: 0 0 20px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(244, 237, 225, 0.76);
}

/* ---------- 贺兰山轮廓 ---------- */
.page-about .ridge-block {
  margin: clamp(26px, 3.6vw, 42px) 0;
  padding: clamp(18px, 2.4vw, 26px) 0 0;
  border-top: 1px solid var(--rock-200);
  border-bottom: 1px solid var(--rock-200);
}

.page-about .helan-ridge {
  display: block;
  width: 100%;
  height: clamp(70px, 9vw, 118px);
  color: var(--sand-500);
  opacity: 0.7;
}

.page-about .helan-ridge path {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}

.page-about .ridge-caption {
  margin: 6px 0 14px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--rock-600);
  text-align: right;
}

/* ---------- 赛季节点 ---------- */
.page-about .milestones {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
}

.page-about .milestone {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 0 18px 24px;
  border-left: 2px solid var(--paper-300);
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 25px;
  width: 13px;
  height: 13px;
  background: var(--sand-500);
  clip-path: polygon(0 0, 68% 0, 100% 32%, 100% 100%, 0 100%);
}

.page-about .milestone__season {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--sand-500);
}

.page-about .milestone__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-800);
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 4vw, 48px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 2px solid var(--ink-900);
}

.page-about .about-cta__lead {
  margin: 0 0 20px;
  max-width: 40ch;
  font-family: var(--font-serif);
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.55;
  color: var(--ink-900);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
}

.page-about .about-cta__text-link {
  font-size: 14.5px;
  text-decoration: none;
  color: var(--ink-800);
  border-bottom: 1px solid var(--rock-200);
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-cta__text-link:hover,
.page-about .about-cta__text-link:focus-visible {
  color: var(--sand-500);
  border-bottom-color: var(--sand-500);
}

/* ============ 响应式 ============ */

@media (min-width: 700px) {
  .page-about .milestone {
    grid-template-columns: 148px minmax(0, 1fr);
    column-gap: 24px;
    align-items: baseline;
  }

  .page-about .milestone__season {
    text-align: right;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-hero__visual img {
    aspect-ratio: 5 / 6;
  }
}

@media (min-width: 1000px) {
  .page-about .archive {
    grid-template-columns: 186px minmax(0, 1fr);
    column-gap: clamp(36px, 4.4vw, 68px);
    align-items: start;
  }

  .page-about .archive__rail {
    position: sticky;
    top: calc(var(--bar-h) + 26px);
  }

  .page-about .archive__index {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .archive__index li {
    padding: 0 0 26px 26px;
    border-left: 1px solid var(--rock-200);
  }

  .page-about .archive__index li:last-child {
    padding-bottom: 0;
    border-left-color: transparent;
  }

  .page-about .archive__index a {
    padding: 0;
    background: none;
    clip-path: none;
  }

  .page-about .archive__index a::before {
    display: block;
    content: "";
    position: absolute;
    left: -32px;
    top: 5px;
    width: 11px;
    height: 11px;
    box-sizing: border-box;
    border: 2px solid var(--rock-200);
    border-radius: 50%;
    background: var(--paper-100);
    transition: background-color 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
  }

  .page-about .archive__index a:hover {
    background: none;
  }

  .page-about .archive__index a:hover .archive__name,
  .page-about .archive__index a:focus-visible .archive__name {
    color: var(--sand-500);
  }

  .page-about .archive__index a.is-active {
    background: none;
  }

  .page-about .archive__index a.is-active .archive__year {
    color: var(--sand-500);
  }

  .page-about .archive__index a.is-active .archive__name {
    color: var(--ink-900);
    font-weight: 600;
  }

  .page-about .archive__index a.is-active::before {
    background: var(--sand-500);
    border-color: var(--sand-500);
    box-shadow: 0 0 0 4px rgba(200, 145, 47, 0.18);
  }

  .page-about .archive__name {
    white-space: normal;
    line-height: 1.5;
  }
}

@media (max-width: 560px) {
  .page-about .about-hero::before {
    display: none;
  }

  .page-about .chapter__figure img,
  .page-about .about-hero__visual img {
    clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  }

  .page-about .team-panel {
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .archive__index a,
  .page-about .archive__index a::before,
  .page-about .role > summary,
  .page-about .about-cta__text-link,
  .page-about .about-crumbs a {
    transition: none;
  }
}