/* ===== 品牌总览页 · 页面作用域 ===== */
.page-about {
  --about-line: rgba(232, 230, 225, 0.16);
  --about-line-strong: rgba(232, 230, 225, 0.32);
  --about-panel: rgba(247, 247, 244, 0.045);
  --about-rail: clamp(92px, 13vw, 190px);
  --h-hue-1: #22D3EE;
  --h-hue-2: #FF6B35;
  --h-hue-3: #7C3AED;
  --h-hue-4: #10B981;
  --h-hue-5: #F59E0B;
  --h-hue-6: #3B82F6;
  --h-hue-7: #F43F5E;
  --h-hue-8: #84CC16;

  background: var(--rock);
  color: var(--light-rock);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.85;
  padding-bottom: clamp(40px, 6vw, 90px);
  -webkit-font-smoothing: antialiased;
}

.page-about .about-crumb {
  padding-top: clamp(16px, 2.4vw, 32px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: 0.08em;
  color: var(--cool-gray);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 10px;
  color: rgba(139, 149, 165, 0.6);
}

.page-about .breadcrumb-link {
  color: var(--cool-gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

.page-about .breadcrumb-item [aria-current="page"] {
  color: var(--light-rock);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  padding: clamp(28px, 4.5vw, 72px) 0 clamp(30px, 4vw, 62px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 60px);
}

.page-about .about-hero-main {
  min-width: 0;
}

.page-about .kicker {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  font-family: var(--font-title);
  font-weight: 200;
  font-size: var(--fs-h1);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--warm-white);
  margin: 0 0 clamp(16px, 2vw, 26px);
  max-width: 18ch;
}

.page-about .about-lede {
  max-width: 64ch;
  margin: 0 0 clamp(20px, 2.6vw, 32px);
  color: var(--light-rock);
  font-size: clamp(16px, 1.12vw, 19px);
  line-height: 1.88;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-panel {
  border: 2px solid var(--about-line-strong);
  background: var(--deep-blue);
  box-shadow: var(--shadow-hard-sm);
  padding: clamp(18px, 2.2vw, 28px);
  align-self: end;
}

.page-about .about-panel-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cool-gray);
}

.page-about .about-panel-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-panel-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-panel-list li:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .about-panel-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 2.8vw, 40px);
  line-height: 1;
  color: var(--orange);
  font-weight: 500;
}

.page-about .about-panel-key {
  font-size: var(--fs-caption);
  letter-spacing: 0.05em;
  color: var(--cool-gray);
  text-align: right;
}

/* ===== 章节目录 ===== */
.page-about .about-toc {
  background: rgba(27, 42, 58, 0.65);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-toc-list {
  display: flex;
  gap: clamp(14px, 2.4vw, 36px);
  margin: 0;
  padding: clamp(12px, 1.8vw, 20px) 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  text-decoration: none;
  color: var(--cool-gray);
  font-size: var(--fs-caption);
  letter-spacing: 0.06em;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

.page-about .about-toc-idx {
  font-family: var(--font-mono);
  color: var(--orange);
}

/* ===== 章节骨架 ===== */
.page-about .about-section {
  padding: clamp(38px, 6vw, 96px) 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-section--last {
  border-bottom: none;
}

.page-about .about-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 40px);
}

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

.page-about .about-idx {
  font-family: var(--font-mono);
  font-size: clamp(48px, 7vw, 104px);
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(232, 230, 225, 0.3);
}

.page-about .about-rail-label {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cool-gray);
  border-left: 2px solid var(--cyan);
  padding-left: 10px;
  line-height: 1.2;
}

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

.page-about .about-body h2 {
  font-family: var(--font-title);
  font-weight: 200;
  font-size: var(--fs-h2);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--warm-white);
  margin: 0 0 clamp(14px, 1.8vw, 24px);
  max-width: 22ch;
}

.page-about .about-body h3 {
  font-family: var(--font-title);
  font-weight: 300;
  font-size: var(--fs-h3);
  line-height: 1.3;
  color: var(--warm-white);
  margin: clamp(26px, 3.4vw, 44px) 0 12px;
}

.page-about .about-body p {
  margin: 0 0 clamp(14px, 1.6vw, 22px);
  max-width: 68ch;
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--warm-white);
  border-bottom-color: var(--warm-white);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 34px);
}

/* ===== 图片 ===== */
.page-about .about-figure {
  margin: clamp(22px, 3vw, 38px) 0;
}

.page-about .about-figure .media-frame {
  border: 2px solid var(--about-line-strong);
  box-shadow: var(--shadow-hard-sm);
  overflow: hidden;
  background: rgba(27, 42, 58, 0.5);
}

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

.page-about .about-figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: 0.05em;
  color: var(--cool-gray);
}

/* ===== 口径对照表 ===== */
.page-about .about-table-wrap {
  margin: clamp(18px, 2.4vw, 30px) 0;
  overflow-x: auto;
  border: 2px solid var(--about-line-strong);
  background: rgba(27, 42, 58, 0.5);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: clamp(14px, 1vw, 16px);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-table thead th {
  background: var(--deep-blue);
  color: var(--warm-white);
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.page-about .about-table tbody th {
  font-weight: 500;
  color: var(--warm-white);
  white-space: nowrap;
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: none;
}

.page-about .about-mono {
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
}

.page-about .about-table .about-mono {
  color: var(--cyan);
}

/* ===== 八区间环形 ===== */
.page-about .about-ring-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 42px);
  margin: clamp(20px, 2.8vw, 34px) 0;
}

.page-about .about-ring {
  margin: 0;
  border: 2px solid var(--about-line-strong);
  background: var(--deep-blue);
  box-shadow: var(--shadow-hard-sm);
  padding: clamp(12px, 1.6vw, 20px);
  justify-self: center;
  width: min(100%, 320px);
}

.page-about .about-ring-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-ring-svg circle {
  fill: none;
  stroke-width: 16;
}

.page-about .about-ring-track {
  stroke: rgba(232, 230, 225, 0.09);
}

.page-about .about-ring-seg--1 { stroke: var(--h-hue-1); }
.page-about .about-ring-seg--2 { stroke: var(--h-hue-2); }
.page-about .about-ring-seg--3 { stroke: var(--h-hue-3); }
.page-about .about-ring-seg--4 { stroke: var(--h-hue-4); }
.page-about .about-ring-seg--5 { stroke: var(--h-hue-5); }
.page-about .about-ring-seg--6 { stroke: var(--h-hue-6); }
.page-about .about-ring-seg--7 { stroke: var(--h-hue-7); }
.page-about .about-ring-seg--8 { stroke: var(--h-hue-8); }

.page-about .about-ring-num {
  font-family: var(--font-mono);
  font-size: 40px;
  fill: var(--warm-white);
  letter-spacing: -0.02em;
}

.page-about .about-ring-cap {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--cool-gray);
  letter-spacing: 0.24em;
}

.page-about .about-ring-legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
  align-content: start;
}

.page-about .about-ring-legend li {
  display: flex;
  align-items: center;
  gap: 9px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--about-line);
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: 0.04em;
  color: var(--cool-gray);
}

.page-about .about-ring-legend strong {
  color: var(--warm-white);
  font-weight: 500;
}

.page-about .about-dot {
  width: 10px;
  height: 10px;
  flex: 0 0 10px;
  display: block;
  background: var(--cool-gray);
}

.page-about .about-ring-legend li:nth-child(1) .about-dot { background: var(--h-hue-1); }
.page-about .about-ring-legend li:nth-child(2) .about-dot { background: var(--h-hue-2); }
.page-about .about-ring-legend li:nth-child(3) .about-dot { background: var(--h-hue-3); }
.page-about .about-ring-legend li:nth-child(4) .about-dot { background: var(--h-hue-4); }
.page-about .about-ring-legend li:nth-child(5) .about-dot { background: var(--h-hue-5); }
.page-about .about-ring-legend li:nth-child(6) .about-dot { background: var(--h-hue-6); }
.page-about .about-ring-legend li:nth-child(7) .about-dot { background: var(--h-hue-7); }
.page-about .about-ring-legend li:nth-child(8) .about-dot { background: var(--h-hue-8); }

/* ===== 产品线索引 ===== */
.page-about .about-lines-head {
  display: none;
}

.page-about .about-lines {
  margin: clamp(18px, 2.4vw, 28px) 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--about-line-strong);
}

.page-about .about-line {
  display: grid;
  grid-template-columns: 12px 56px 74px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-line-swatch {
  display: block;
  width: 12px;
  height: 12px;
  background: var(--cool-gray);
}

.page-about .about-line[data-hue="1"] .about-line-swatch { background: var(--h-hue-1); }
.page-about .about-line[data-hue="2"] .about-line-swatch { background: var(--h-hue-2); }
.page-about .about-line[data-hue="3"] .about-line-swatch { background: var(--h-hue-3); }
.page-about .about-line[data-hue="4"] .about-line-swatch { background: var(--h-hue-4); }
.page-about .about-line[data-hue="5"] .about-line-swatch { background: var(--h-hue-5); }
.page-about .about-line[data-hue="6"] .about-line-swatch { background: var(--h-hue-6); }
.page-about .about-line[data-hue="7"] .about-line-swatch { background: var(--h-hue-7); }
.page-about .about-line[data-hue="8"] .about-line-swatch { background: var(--h-hue-8); }

.page-about .about-line-id,
.page-about .about-line-ver,
.page-about .about-line-batch {
  font-family: var(--font-mono);
  font-size: clamp(13px, 0.95vw, 15px);
  letter-spacing: 0.04em;
}

.page-about .about-line-id {
  color: var(--warm-white);
  font-weight: 500;
}

.page-about .about-line-ver {
  color: var(--cool-gray);
}

.page-about .about-line-batch {
  color: var(--light-rock);
}

/* ===== 信任信息 ===== */
.page-about .about-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 32px;
  margin: clamp(20px, 2.6vw, 34px) 0;
  padding: 0;
  border-top: 2px solid var(--about-line-strong);
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-fact dt {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cool-gray);
}

.page-about .about-fact dd {
  margin: 0;
  color: var(--warm-white);
  font-size: clamp(15px, 1.05vw, 17px);
  word-break: break-word;
}

.page-about .about-fact .about-mono {
  color: var(--cyan);
}

/* ===== 响应式：中等以上 ===== */
@media (min-width: 720px) {
  .page-about .about-ring-wrap {
    grid-template-columns: minmax(200px, 300px) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-fact--wide {
    grid-column: 1 / -1;
  }

  .page-about .about-fact--wide {
    grid-template-columns: 180px minmax(0, 1fr);
    align-items: baseline;
  }
}

/* ===== 响应式：桌面 ===== */
@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .about-row {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 72px);
  }

  .page-about .about-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-lines-head {
    display: grid;
    grid-template-columns: 12px 56px 74px minmax(0, 1fr);
    gap: 12px;
    align-items: center;
    padding: 0 0 10px;
    font-family: var(--font-mono);
    font-size: var(--fs-caption);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--cool-gray);
  }

  .page-about .about-lines-head + .about-lines {
    margin-top: 0;
  }
}

/* ===== 响应式：窄屏修正 ===== */
@media (max-width: 480px) {
  .page-about .about-ring-legend {
    grid-template-columns: 1fr;
  }

  .page-about .about-line {
    grid-template-columns: 12px 46px minmax(0, 1fr);
    gap: 8px 10px;
  }

  .page-about .about-line-batch {
    grid-column: 3 / 4;
  }

  .page-about .about-idx {
    -webkit-text-stroke-width: 1px;
  }
}

/* ===== 减少动效 ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc-link,
  .page-about .breadcrumb-link,
  .page-about .about-inline-link {
    transition: none;
  }
}