/* ===== 品牌档案 / page-about ===== */

.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: clamp(18px, 3vw, 30px);
  padding-bottom: clamp(38px, 6vw, 80px);
  border-bottom: var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--lime-07) 1px, transparent 1px),
    linear-gradient(to bottom, var(--lime-07) 1px, transparent 1px);
  background-size: 80px 80px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 76%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 76%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 3.5vw, 34px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.012em;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin-top: clamp(16px, 2.4vw, 24px);
  max-width: 40em;
  color: var(--paper-72);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 4vw, 42px);
  background: var(--hair);
  border: var(--line);
}

.page-about .about-hero__cell {
  background: var(--ink);
  padding: 14px 12px 16px;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-hero__label {
  display: block;
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  padding-block: clamp(42px, 6.5vw, 88px);
}

.page-about .about-chapter + .about-chapter {
  border-top: var(--line);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 0 14px;
  padding-bottom: 18px;
  border-bottom: var(--line);
  margin-bottom: clamp(22px, 3.5vw, 38px);
}

.page-about .about-head__no {
  color: var(--lime);
}

.page-about .about-head__en {
  color: var(--steel);
  text-align: right;
}

.page-about .about-head__title {
  grid-column: 1 / -1;
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 3.6vw, 44px);
  line-height: 1.14;
  letter-spacing: -0.008em;
}

.page-about .about-body p {
  margin: 0 0 14px;
  max-width: 46em;
  color: var(--paper-72);
  font-size: clamp(14.5px, 1.5vw, 16px);
  line-height: 1.85;
}

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

.page-about .about-body a {
  color: var(--mist);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-body a:hover {
  color: var(--lime);
}

/* ---------- 级别色阶条 ---------- */

.page-about .tier-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 3.6vw, 38px);
  background: var(--hair);
  border: var(--line);
}

@media (min-width: 860px) {
  .page-about .tier-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .tier {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--ink-2);
  color: var(--paper);
  text-decoration: none;
  padding: 26px 16px 20px;
  transition: background 0.25s var(--ease);
}

.page-about .tier::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: var(--tier-color, var(--steel));
}

.page-about .tier:hover,
.page-about .tier:focus-visible {
  background: #1c3b33;
}

.page-about .tier--open { --tier-color: var(--mist); }
.page-about .tier--elite { --tier-color: var(--lime); }
.page-about .tier--invite { --tier-color: var(--orange); }
.page-about .tier--masters { --tier-color: var(--lime-dim); }

.page-about .tier__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 22px);
  letter-spacing: 0.01em;
  color: var(--tier-color, var(--paper));
}

.page-about .tier__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .tier__desc {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--paper-52);
}

.page-about .tier__more {
  margin-top: auto;
  padding-top: 12px;
  color: var(--paper-72);
  border-top: 1px solid var(--hair);
}

.page-about .tier:hover .tier__more {
  color: var(--lime);
}

.page-about .about-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 52em;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--steel);
  padding-left: 12px;
  border-left: 2px solid var(--lime-dim);
}

.page-about .about-tier-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

/* ---------- 团队卡片 ---------- */

.page-about .crew-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(12px, 2vw, 20px);
  margin-top: clamp(22px, 3.4vw, 34px);
}

@media (min-width: 760px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .crew-card {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  background: var(--ink-2);
  border: var(--line);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .crew-card:hover,
.page-about .crew-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--lime-dim);
  box-shadow: var(--shadow-soft);
}

.page-about .crew-card__no {
  position: absolute;
  top: 16px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .crew-card__name {
  margin: 0 0 10px;
  padding-right: 44px;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .crew-card__desc {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-52);
}

.page-about .crew-card__keys {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .key-chip {
  padding: 4px 9px;
  border: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
  color: var(--steel);
  transition: color 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .crew-card:hover .key-chip {
  color: var(--lime);
  border-color: var(--lime-dim);
}

/* ---------- 时间线 ---------- */

.page-about .timeline-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 46px);
  align-items: start;
}

@media (min-width: 940px) {
  .page-about .timeline-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 6px;
  width: 1px;
  background: var(--hair);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 14px 58px minmax(0, 1fr);
  column-gap: 10px;
  padding: 15px 0;
}

.page-about .tl-item + .tl-item {
  border-top: var(--line);
}

.page-about .tl-dot {
  width: 7px;
  height: 7px;
  margin-top: 8px;
  justify-self: center;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px var(--lime-12);
}

.page-about .tl-year {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .tl-details {
  min-width: 0;
}

.page-about .tl-summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  padding: 0;
  font-size: clamp(14.5px, 1.6vw, 16.5px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

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

.page-about .tl-summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--lime);
}

.page-about .tl-details[open] .tl-summary::after {
  content: "−";
}

.page-about .tl-summary:hover {
  color: var(--lime-bright);
}

.page-about .tl-details p {
  margin: 10px 0 0;
  max-width: 42em;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--paper-52);
}

.page-about .timeline-figure {
  margin: 0;
}

@media (min-width: 940px) {
  .page-about .timeline-figure {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
}

/* ---------- 合作方角色 ---------- */

.page-about .role-list {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--line);
}

.page-about .role-row {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  grid-template-areas:
    "no name"
    ". text";
  column-gap: 12px;
  row-gap: 6px;
  padding: 18px 0;
  border-bottom: var(--line);
}

@media (min-width: 820px) {
  .page-about .role-row {
    grid-template-columns: 18px 150px minmax(0, 1fr);
    grid-template-areas: "no name text";
    align-items: baseline;
    row-gap: 0;
    column-gap: 20px;
  }
}

.page-about .role-row__no {
  grid-area: no;
  color: var(--orange);
}

.page-about .role-row__name {
  grid-area: name;
  margin: 0;
  font-size: clamp(15px, 1.7vw, 17px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .role-row__text {
  grid-area: text;
  margin: 0;
  max-width: 52em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-52);
}

.page-about .steps {
  margin-top: clamp(26px, 4vw, 42px);
  padding: clamp(20px, 3vw, 30px);
  background: var(--ink-2);
  border: var(--line);
}

.page-about .steps__lead {
  margin: 0 0 18px;
  color: var(--lime);
}

.page-about .steps__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

@media (min-width: 760px) {
  .page-about .steps__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--hair);
  }
}

.page-about .steps__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--ink-2);
  padding: 0;
}

@media (min-width: 760px) {
  .page-about .steps__item {
    padding: 16px 18px;
  }
}

.page-about .steps__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .steps__name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .steps__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper-52);
}

.page-about .steps__note {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .steps__note a {
  color: var(--mist);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .steps__note a:hover {
  color: var(--lime);
}

/* ---------- 服务范围 ---------- */

.page-about .range-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
}

@media (min-width: 940px) {
  .page-about .range-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

.page-about .range-legend {
  margin-top: clamp(20px, 3vw, 30px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .city-map {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 6px;
  width: min(100%, 288px);
}

.page-about .city-map span {
  display: block;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--hair);
  background: var(--lime-07);
}

.page-about .city-map span.is-hub {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 3px var(--lime-12);
}

.page-about .range-legend__text {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 0;
  max-width: 34em;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .range-legend__dot {
  flex: none;
  width: 9px;
  height: 9px;
  margin-top: 5px;
  background: var(--lime);
}

.page-about .range-panel {
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-2);
  border: var(--line);
  box-shadow: var(--shadow-soft);
}

.page-about .range-panel__label {
  margin: 0 0 16px;
  color: var(--steel);
}

.page-about .range-panel__list {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .range-panel__list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--hair);
}

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

.page-about .range-panel__num {
  flex: none;
  width: 52px;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 500;
  line-height: 1;
  color: var(--lime);
}

.page-about .range-panel__desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--paper-72);
}

.page-about .about-cta {
  display: inline-flex;
  width: 100%;
  justify-content: center;
}

@media (min-width: 940px) {
  .page-about .about-cta {
    width: auto;
  }
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .tier,
  .page-about .crew-card,
  .page-about .key-chip {
    transition: none;
  }
  .page-about .crew-card:hover,
  .page-about .crew-card:focus-within {
    transform: none;
  }
}
<<<END>>>