/* ============ 品牌档案页 · page-about ============ */

.page-about {
  display: block;
  min-width: 0;
}

/* --- 首屏 --- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 46px);
  padding-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .breadcrumb {
  font-family: var(--ff-mono);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--mist);
  margin: 0 0 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-hero__title {
  font-family: var(--ff-display);
  font-weight: 800;
  font-size: clamp(29px, 5vw, 56px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 8px 0 20px;
  max-width: 900px;
}

.page-about .about-hero__lead {
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.8;
  color: var(--mist);
  max-width: 780px;
  margin: 0 0 clamp(24px, 3.4vw, 40px);
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
}

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

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

.page-about .figure__media {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .figure__cap {
  margin-top: 10px;
  font-size: var(--fs-12);
  color: var(--mist);
  line-height: 1.7;
}

/* --- 正文骨架：章节索引 + 内容流 --- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 44px);
  padding-bottom: clamp(32px, 5vw, 68px);
}

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

/* --- 章节索引 --- */
.page-about .about-index {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}

.page-about .about-index__title {
  font-family: var(--ff-mono);
  font-size: var(--fs-12);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 10px;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid var(--line);
  color: var(--mist);
  text-decoration: none;
  font-size: var(--fs-14);
  transition: color var(--t), border-color var(--t), background var(--t);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  background: rgba(53, 224, 208, .08);
}

.page-about .about-index__num {
  font-family: var(--ff-mono);
  font-size: var(--fs-12);
  color: var(--cyan);
  letter-spacing: .06em;
}

/* --- 区块通用 --- */
.page-about .about-sec {
  border-top: 1px solid var(--line);
  padding: clamp(26px, 3.6vw, 48px) 0;
  scroll-margin-top: 96px;
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec:last-child {
  padding-bottom: 0;
}

.page-about .about-sec__head {
  margin-bottom: clamp(16px, 2vw, 26px);
}

.page-about .sec-title {
  font-family: var(--ff-display);
  font-weight: 800;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 6px 0 0;
}

.page-about .prose {
  max-width: 700px;
}

.page-about .prose p {
  color: var(--mist);
  font-size: var(--fs-16);
  line-height: 1.8;
  margin: 0 0 14px;
}

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

.page-about .prose a,
.page-about .about-vendor__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .4);
  transition: border-color var(--t), color var(--t);
}

.page-about .prose a:hover,
.page-about .about-vendor__text a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-note {
  margin: 18px 0 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--mist);
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-about .about-note a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 184, 65, .45);
}

.page-about .about-note a:hover {
  border-bottom-color: var(--amber);
}

.page-about .about-sec__figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
}

/* --- 横向/纵向时间轴 --- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line);
  display: grid;
  gap: clamp(20px, 2.6vw, 28px);
}

.page-about .tl-node {
  position: relative;
  --accent: var(--cyan);
}

.page-about .tl-node--p { --accent: var(--cyan); }
.page-about .tl-node--r { --accent: var(--amber); }
.page-about .tl-node--v { --accent: var(--rose); }
.page-about .tl-node--n { --accent: #7C8AA0; }

.page-about .tl-node__dot {
  position: absolute;
  left: -27px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--ink), 0 0 14px -2px var(--accent);
  transition: transform var(--t);
}

.page-about .tl-node:hover .tl-node__dot {
  transform: scale(1.25);
}

.page-about .tl-node__stage {
  font-size: var(--fs-12);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 6px;
}

.page-about .tl-node__title {
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: var(--fs-20);
  line-height: 1.25;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .tl-node__text {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
  margin: 0;
}

/* --- 三条栏目线卡片 --- */
.page-about .about-lines {
  display: grid;
  gap: 14px;
  margin: clamp(20px, 3vw, 34px) 0 0;
}

.page-about .line-card {
  --accent: var(--cyan);
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  padding: 20px 18px 22px;
  box-shadow: var(--shadow-panel);
  transition: transform var(--t), border-color var(--t);
}

.page-about .line-card--p { --accent: var(--cyan); }
.page-about .line-card--r { --accent: var(--amber); }
.page-about .line-card--v { --accent: var(--rose); }

.page-about .line-card:hover {
  transform: translateY(-3px);
}

.page-about .line-card__code {
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--accent);
  margin: 0 0 10px;
}

.page-about .line-card__title {
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: var(--fs-20);
  line-height: 1.28;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .line-card__text {
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--mist);
  margin: 0;
}

.page-about .line-card__fields {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .line-card__fields li {
  font-family: var(--ff-mono);
  font-size: var(--fs-12);
  padding: 3px 8px;
  border: 1px dashed var(--line);
  color: var(--paper);
  white-space: nowrap;
}

/* --- 维护分工 --- */
.page-about .about-team-grid {
  display: grid;
  gap: 14px;
  margin: clamp(20px, 3vw, 32px) 0 0;
}

.page-about .team-card {
  --accent: var(--cyan);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: var(--panel);
  padding: 18px;
}

.page-about .team-card:nth-child(1) { --accent: var(--cyan); }
.page-about .team-card:nth-child(2) { --accent: var(--amber); }
.page-about .team-card:nth-child(3) { --accent: var(--rose); }

.page-about .team-card__num {
  font-size: var(--fs-36);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--accent);
  margin: 0 0 10px;
}

.page-about .team-card__title {
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: var(--fs-20);
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .team-card__text {
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--mist);
  margin: 0;
}

.page-about .about-flow-list {
  list-style: none;
  counter-reset: step;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-flow-list li {
  counter-increment: step;
  background: var(--panel);
  padding: 18px;
}

.page-about .about-flow-list li::before {
  content: "0" counter(step);
  display: block;
  font-family: var(--ff-mono);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .flow-step__name {
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: var(--fs-16);
  color: var(--paper);
  margin: 0 0 6px;
}

.page-about .flow-step__text {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
  margin: 0;
}

/* --- 厂商登记 --- */
.page-about .about-vendor {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

.page-about .about-vendor__text .prose {
  max-width: 640px;
}

.page-about .vendor-tiers {
  list-style: none;
  margin: 18px 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .vendor-tiers li {
  --tier: var(--rose);
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--tier);
  background: var(--panel);
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--mist);
}

.page-about .vendor-tiers li:nth-child(1) { --tier: var(--rose); }
.page-about .vendor-tiers li:nth-child(2) { --tier: var(--amber); }
.page-about .vendor-tiers li:nth-child(3) { --tier: var(--cyan); }
.page-about .vendor-tiers li:nth-child(4) { --tier: #7C8AA0; }

.page-about .vendor-tiers b {
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: var(--fs-16);
  color: var(--paper);
}

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

/* --- 版本归档 · 暖纸叠层 --- */
.page-about .about-sec--paper {
  border-top: 0;
  padding-top: clamp(10px, 1.6vw, 18px);
}

.page-about .about-archive {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid #cfc6b3;
  padding: clamp(22px, 3vw, 40px);
  max-width: 900px;
  box-shadow:
    6px 6px 0 0 rgba(169, 180, 196, .16),
    12px 12px 0 0 rgba(169, 180, 196, .07);
}

.page-about .about-archive::after {
  content: "";
  display: block;
  height: 3px;
  margin-top: clamp(20px, 2.6vw, 30px);
  background: linear-gradient(90deg, var(--teal-deep), var(--gold-deep) 52%, var(--rose-deep));
  opacity: .75;
}

.page-about .about-archive .eyebrow {
  color: #7a6a3e;
}

.page-about .about-archive .sec-title {
  color: var(--ink);
  margin-bottom: 16px;
}

.page-about .about-archive p {
  color: #3A4252;
  font-size: var(--fs-16);
  line-height: 1.85;
  margin: 0 0 14px;
  max-width: 680px;
}

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

.page-about .about-fold {
  border: 1px solid #cfc6b3;
  background: rgba(10, 20, 36, .045);
  margin: 18px 0;
  max-width: 680px;
}

.page-about .about-fold summary {
  cursor: pointer;
  list-style: none;
  padding: 13px 15px;
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: var(--fs-16);
  color: var(--ink);
  transition: background var(--t);
}

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

.page-about .about-fold summary::before {
  content: "+";
  font-family: var(--ff-mono);
  color: #8a6a12;
  margin-right: 9px;
}

.page-about .about-fold[open] summary::before {
  content: "−";
}

.page-about .about-fold summary:hover {
  background: rgba(10, 20, 36, .05);
}

.page-about .about-fold p {
  margin: 0;
  padding: 0 15px 15px;
  color: #3A4252;
  font-size: var(--fs-14);
  line-height: 1.8;
  max-width: none;
}

.page-about .about-archive a.btn {
  display: inline-block;
  margin-top: 4px;
}

/* --- 数据一览 --- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .stat-cell {
  --accent: var(--cyan);
  background: var(--panel);
  padding: 16px 15px 18px;
  transition: background var(--t);
}

.page-about .stat-cell:nth-child(3n+1) { --accent: var(--cyan); }
.page-about .stat-cell:nth-child(3n+2) { --accent: var(--amber); }
.page-about .stat-cell:nth-child(3n) { --accent: var(--rose); }

.page-about .stat-cell:hover {
  background: #191d24;
}

.page-about .stat-cell__num {
  font-family: var(--ff-mono);
  font-weight: 500;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--accent);
  margin: 0 0 10px;
}

.page-about .stat-cell__unit {
  font-size: var(--fs-14);
  color: var(--mist);
  margin-left: 4px;
  letter-spacing: 0;
}

.page-about .stat-cell__label {
  font-size: var(--fs-14);
  color: var(--paper);
  margin: 0 0 5px;
}

.page-about .stat-cell__note {
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--mist);
  margin: 0;
}

/* --- 结尾入口 --- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(53, 224, 208, .06), transparent 72%);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 20px;
  padding: clamp(28px, 4vw, 54px) 0;
}

.page-about .about-cta__lead {
  max-width: 620px;
  margin: 12px 0 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-vendor__text .prose {
    max-width: 660px;
  }
}

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

  .page-about .about-flow-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 34px 0 0;
    gap: clamp(18px, 2.4vw, 30px);
  }

  .page-about .tl-node__dot {
    left: 0;
    top: -39px;
  }

  .page-about .about-vendor {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-index {
    position: sticky;
    top: 92px;
    align-self: start;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 4px 0 4px 0;
  }

  .page-about .about-index__title {
    padding-left: 14px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 2px solid var(--line);
    padding: 10px 12px;
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(53, 224, 208, .12), transparent);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-card,
  .page-about .tl-node__dot,
  .page-about .about-index__link,
  .page-about .stat-cell {
    transition: none;
  }

  .page-about .line-card:hover {
    transform: none;
  }

  .page-about .tl-node:hover .tl-node__dot {
    transform: none;
  }
}