/* ===== 品牌自述 · page-about ===== */

.page-about {
  --ab-line: rgba(14, 28, 46, .12);
  --ab-line-inv: rgba(223, 231, 240, .16);
  --ab-gap-wide: clamp(48px, 8vw, 96px);
  --ab-gap-tight: clamp(32px, 5vw, 56px);
  background: var(--cream-100);
  color: var(--ink-900);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about *,
.page-about *::before,
.page-about *::after { box-sizing: border-box; }

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 8px;
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 34px);
  padding: 0;
  font-size: 13px;
}
.page-about .ab-crumb .bb-breadcrumb__item + .bb-breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(247, 244, 237, .36);
}
.page-about .ab-crumb .bb-breadcrumb__link {
  color: rgba(247, 244, 237, .7);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .ab-crumb .bb-breadcrumb__link:hover,
.page-about .ab-crumb .bb-breadcrumb__link:focus-visible {
  color: var(--gold-500);
  border-bottom-color: var(--gold-500);
}
.page-about .ab-crumb .bb-breadcrumb__current { color: var(--cream-100); }

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(26px, 5vw, 48px) 0 clamp(46px, 8vw, 88px);
  background:
    radial-gradient(circle at 84% 6%, rgba(217, 174, 75, .2), transparent 54%),
    radial-gradient(circle at 4% 98%, rgba(62, 124, 107, .3), transparent 52%),
    var(--ink-900);
  color: var(--cream-100);
}
.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
  align-items: start;
}
.page-about .ab-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(30px, 4.4vw + 12px, 54px);
  line-height: 1.14;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--cream-100);
}
.page-about .ab-hero .bb-eyebrow { color: var(--gold-500); }
.page-about .ab-hero .bb-lead {
  margin: 0;
  max-width: 54ch;
  font-size: clamp(15px, .6vw + 13px, 18px);
  line-height: 1.8;
  color: rgba(247, 244, 237, .82);
}
.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 32px);
}

/* 按钮（页面作用域内的基础形态） */
.page-about .bb-btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.page-about .bb-btn--gold {
  background: var(--gold-500);
  color: var(--ink-900);
  border-color: var(--gold-500);
}
.page-about .bb-btn--gold:hover,
.page-about .bb-btn--gold:focus-visible {
  background: var(--gold-100);
  border-color: var(--gold-100);
}
.page-about .bb-btn--ghost {
  background: transparent;
  color: var(--cream-100);
  border-color: rgba(247, 244, 237, .42);
}
.page-about .bb-btn--ghost:hover,
.page-about .bb-btn--ghost:focus-visible {
  color: var(--gold-500);
  border-color: var(--gold-500);
}
.page-about .bb-btn--ink {
  background: var(--ink-900);
  color: var(--cream-100);
  border-color: var(--ink-900);
}
.page-about .bb-btn--ink:hover,
.page-about .bb-btn--ink:focus-visible {
  background: var(--ink-700);
  border-color: var(--ink-700);
}

/* 首屏数据面板 */
.page-about .ab-panel {
  border: 1px solid var(--ab-line-inv);
  border-radius: var(--radius-l) var(--radius-s) var(--radius-l) var(--radius-l);
  background: linear-gradient(155deg, rgba(22, 48, 76, .94), rgba(14, 28, 46, .76));
  padding: clamp(20px, 3vw, 30px);
  box-shadow: var(--shadow-soft);
}
.page-about .ab-panel__kicker {
  margin: 0 0 18px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--gold-500);
}
.page-about .ab-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-panel__row {
  display: grid;
  grid-template-columns: minmax(76px, auto) minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--ab-line-inv);
}
.page-about .ab-panel__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .ab-panel__num {
  font-family: var(--font-num);
  font-size: 24px;
  line-height: 1;
  letter-spacing: .02em;
}
.page-about .ab-panel__num.bb-num--gold { color: var(--gold-500); }
.page-about .ab-panel__num.bb-num--celadon { color: var(--celadon-200); }
.page-about .ab-panel__label {
  font-size: 14px;
  line-height: 1.65;
  color: rgba(247, 244, 237, .8);
}
.page-about .ab-panel__foot {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ab-line-inv);
  font-size: 13px;
  line-height: 1.7;
  color: var(--celadon-200);
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  background: var(--ink-700);
  color: var(--cream-100);
  border-bottom: 1px solid var(--ab-line-inv);
}
.page-about .ab-index__nav {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 12px 0;
  scrollbar-width: none;
}
.page-about .ab-index__nav::-webkit-scrollbar { display: none; }
.page-about .ab-index .bb-anchors__link {
  display: inline-block;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--ink-100);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.page-about .ab-index .bb-anchors__link:hover,
.page-about .ab-index .bb-anchors__link:focus-visible {
  color: var(--ink-900);
  background: var(--gold-500);
  border-color: var(--gold-500);
}

/* ---------- 区块节奏 ---------- */
.page-about .ab-block { padding: var(--ab-gap-wide) 0; }
.page-about .ab-block--cream { background: var(--cream-100); }
.page-about .ab-block--mist { background: var(--mist-200); }
.page-about .ab-block--deep {
  background: var(--ink-900);
  color: var(--cream-100);
}
.page-about .ab-block--deep .bb-text { color: rgba(247, 244, 237, .78); }
.page-about .ab-block--deep .bb-eyebrow { color: var(--gold-500); }

.page-about .ab-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 42px);
}
.page-about .ab-head h2 { margin: 0 0 14px; }
.page-about .bb-eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--celadon-600);
}
.page-about .bb-title-md {
  font-family: var(--font-head);
  font-size: clamp(23px, 1.6vw + 17px, 36px);
  line-height: 1.28;
  letter-spacing: -.02em;
  font-weight: 800;
}
.page-about .ab-block--deep .bb-title-md { color: var(--cream-100); }
.page-about .bb-text {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist-600);
}
.page-about .bb-text:last-child { margin-bottom: 0; }

/* ---------- 不对称双栏 ---------- */
.page-about .ab-split {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}
.page-about .ab-split__main { min-width: 0; }
.page-about .ab-split__aside { min-width: 0; }

/* 侧栏注释 */
.page-about .ab-note {
  border-left: 3px solid var(--gold-500);
  background: var(--gold-100);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  padding: clamp(18px, 3vw, 26px);
}
.page-about .ab-note--celadon {
  border-left-color: var(--celadon-600);
  background: var(--celadon-50);
}
.page-about .ab-note__title {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink-900);
}
.page-about .ab-note__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-700);
}
.page-about .ab-note__link { margin: 0; }

/* 文本链接 */
.page-about .ab-link {
  color: var(--ink-700);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid var(--gold-500);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--gold-700);
  border-bottom-color: var(--gold-700);
}
.page-about .ab-block--deep .ab-link {
  color: var(--gold-500);
  border-bottom-color: rgba(217, 174, 75, .5);
}
.page-about .ab-block--deep .ab-link:hover,
.page-about .ab-block--deep .ab-link:focus-visible {
  color: var(--gold-100);
  border-bottom-color: var(--gold-100);
}

/* ---------- 数据卡（深色侧栏） ---------- */
.page-about .ab-figure {
  background: var(--ink-900);
  color: var(--cream-100);
  border-radius: var(--radius-s) var(--radius-l) var(--radius-l) var(--radius-l);
  padding: clamp(22px, 3vw, 30px);
  box-shadow: var(--shadow-soft);
}
.page-about .ab-figure__title {
  margin: 0 0 16px;
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--gold-500);
}
.page-about .ab-figure__row {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--ab-line-inv);
}
.page-about .ab-figure__num {
  font-family: var(--font-num);
  font-size: 27px;
  line-height: 1.05;
  letter-spacing: .02em;
  color: var(--gold-500);
}
.page-about .ab-figure__label {
  font-size: 13px;
  color: rgba(247, 244, 237, .72);
}
.page-about .ab-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin-top: 18px;
  font-size: 13px;
  color: rgba(247, 244, 237, .78);
}
.page-about .ab-bar__label { display: block; }
.page-about .ab-bar__track {
  display: block;
  height: 6px;
  border-radius: 999px;
  background: rgba(223, 231, 240, .16);
  overflow: hidden;
}
.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  width: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--gold-500), var(--celadon-200));
}
.page-about .ab-bar__val {
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--gold-500);
}

/* ---------- 图片容器 ---------- */
.page-about .ab-shot {
  margin: clamp(22px, 3vw, 32px) 0 0;
  border-radius: var(--radius-s) var(--radius-l) var(--radius-l) var(--radius-l);
  overflow: hidden;
  background: var(--ink-100);
}
.page-about .ab-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-shot figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-600);
  background: var(--cream-100);
}
.page-about .ab-block--deep .ab-shot figcaption {
  background: var(--ink-700);
  color: rgba(247, 244, 237, .7);
}
.page-about .ab-shot--wide { margin: 0 0 clamp(28px, 4vw, 46px); }

/* ---------- 四项数字 ---------- */
.page-about .ab-keys {
  display: grid;
  gap: 1px;
  background: var(--mist-200);
  border: 1px solid var(--mist-200);
  border-radius: var(--radius-m);
  overflow: hidden;
}
.page-about .ab-key {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--cream-100);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .ab-key:hover {
  background: #fff;
  box-shadow: inset 0 3px 0 var(--gold-500);
}
.page-about .ab-key__no {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--celadon-600);
}
.page-about .ab-key h3 {
  margin: 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink-900);
}
.page-about .ab-key p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-600);
}
.page-about .ab-key__foot { margin: 2px 0 0; }

/* 费用速览 */
.page-about .ab-snapshot {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
  padding: clamp(18px, 3vw, 26px);
  border-left: 3px solid var(--gold-500);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: var(--gold-100);
}
.page-about .ab-snapshot__title {
  margin: 0;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--gold-700);
}
.page-about .ab-snapshot__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-900);
}
.page-about .ab-snapshot__action { margin: 0; }
.page-about .ab-copy {
  display: inline-block;
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid var(--gold-700);
  background: transparent;
  color: var(--gold-700);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-about .ab-copy:hover,
.page-about .ab-copy:focus-visible {
  background: var(--gold-700);
  color: var(--cream-100);
}

/* ---------- 质检表格 ---------- */
.page-about .ab-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--mist-200);
  border-radius: var(--radius-m);
  background: #fff;
  -webkit-overflow-scrolling: touch;
}
.page-about .ab-table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  font-size: 15px;
}
.page-about .ab-table caption {
  padding: 15px 18px;
  text-align: left;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--mist-600);
  background: var(--cream-100);
  border-bottom: 1px solid var(--mist-200);
}
.page-about .ab-table th,
.page-about .ab-table td {
  padding: 15px 18px;
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
  border-bottom: 1px solid var(--mist-200);
}
.page-about .ab-table thead th {
  background: var(--ink-700);
  color: var(--cream-100);
  font-size: 13px;
  letter-spacing: .06em;
  font-weight: 600;
}
.page-about .ab-table tbody th {
  font-weight: 700;
  color: var(--ink-900);
  white-space: nowrap;
}
.page-about .ab-table tbody td { color: var(--mist-600); }
.page-about .ab-table tbody tr { transition: background-color var(--dur) var(--ease); }
.page-about .ab-table tbody tr:hover { background: var(--gold-100); }
.page-about .ab-table tbody tr:last-child th,
.page-about .ab-table tbody tr:last-child td { border-bottom: 0; }
.page-about .ab-table .bb-num {
  font-family: var(--font-num);
  font-size: 16px;
  letter-spacing: .02em;
  color: var(--gold-700);
}

/* ---------- 调度中心折叠 ---------- */
.page-about .ab-hubs {
  display: grid;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .ab-hub {
  border: 1px solid var(--mist-200);
  border-radius: var(--radius-m);
  background: #fff;
  transition: border-color var(--dur) var(--ease);
}
.page-about .ab-hub[open] { border-color: var(--gold-500); }
.page-about .ab-hub__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}
.page-about .ab-hub__summary::-webkit-details-marker { display: none; }
.page-about .ab-hub__summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 18px;
  line-height: 1;
  color: var(--celadon-600);
  transition: color var(--dur) var(--ease);
}
.page-about .ab-hub[open] .ab-hub__summary::after {
  content: "－";
  color: var(--gold-500);
}
.page-about .ab-hub__city {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-900);
}
.page-about .ab-hub__meta {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--celadon-600);
}
.page-about .ab-hub__role {
  font-size: 13px;
  color: var(--mist-600);
}
.page-about .ab-hub__body { padding: 0 18px 18px; }
.page-about .ab-hub__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-600);
}
.page-about .ab-hub__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}
.page-about .bb-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  line-height: 1.7;
}
.page-about .bb-tag--celadon {
  background: var(--celadon-50);
  color: var(--celadon-600);
}
.page-about .bb-tag--gold {
  background: var(--gold-100);
  color: var(--gold-700);
}

/* ---------- 发展历程时间线 ---------- */
.page-about .ab-head--deep .bb-text { color: rgba(247, 244, 237, .74); }
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ab-timeline__item {
  position: relative;
  padding-left: 42px;
  padding-bottom: 14px;
}
.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 26px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 0 0 4px rgba(217, 174, 75, .18);
  z-index: 1;
}
.page-about .ab-timeline__item::after {
  content: "";
  position: absolute;
  left: 13px;
  top: 42px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(217, 174, 75, .5), rgba(169, 207, 194, .3));
}
.page-about .ab-timeline__item:last-child { padding-bottom: 0; }
.page-about .ab-timeline__item:last-child::after { display: none; }

.page-about .ab-tl-node {
  border: 1px solid var(--ab-line-inv);
  border-radius: var(--radius-m);
  background: rgba(22, 48, 76, .55);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-about .ab-tl-node[open] {
  border-color: var(--gold-500);
  background: rgba(22, 48, 76, .9);
}
.page-about .ab-tl-node > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}
.page-about .ab-tl-node > summary::-webkit-details-marker { display: none; }
.page-about .ab-tl-node > summary::after {
  content: "＋";
  margin-left: auto;
  font-size: 17px;
  line-height: 1;
  color: var(--gold-500);
  transition: color var(--dur) var(--ease);
}
.page-about .ab-tl-node[open] > summary::after {
  content: "－";
  color: var(--celadon-200);
}
.page-about .ab-tl-node__ver {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--celadon-200);
}
.page-about .ab-tl-node__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--cream-100);
}
.page-about .ab-tl-node__body { padding: 0 18px 18px; }
.page-about .ab-tl-node__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 244, 237, .76);
}

/* ---------- 结尾区 ---------- */
.page-about .ab-outro {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}
.page-about .ab-outro__cta { margin: clamp(20px, 3vw, 28px) 0 0; }
.page-about .ab-next {
  display: grid;
  gap: 12px;
}
.page-about .ab-next__card {
  display: block;
  padding: 20px;
  border: 1px solid var(--mist-200);
  border-radius: var(--radius-m);
  background: #fff;
  text-decoration: none;
  color: var(--ink-900);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  border-color: var(--gold-500);
  box-shadow: var(--shadow-soft);
}
.page-about .ab-next__card strong {
  display: block;
  margin-bottom: 6px;
  font-size: 17px;
  font-weight: 700;
}
.page-about .ab-next__card span {
  display: block;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-600);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-hero__facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .ab-next { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }
  .page-about .ab-split--rev {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.55fr);
  }
  .page-about .ab-split--quality {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }
  .page-about .ab-outro {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }
  .page-about .ab-bar {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1100px) {
  .page-about .ab-keys { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .ab-next { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 619px) {
  .page-about .ab-table { min-width: 520px; }
  .page-about .ab-panel__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }
  .page-about .ab-timeline__item { padding-left: 34px; }
}