.page-about {
  --about-hero-bg: var(--color-primary);
  --about-hero-line: rgba(255, 255, 255, 0.055);
  --about-grid-dot: rgba(255, 255, 255, 0.07);
  font-family: var(--font-body);
  color: var(--color-gray);
  background-color: var(--color-white);
  overflow: hidden;
}

.page-about .about-hero,
.page-about .about-stat-section,
.page-about .about-timeline-wrap {
  position: relative;
}

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

/* ===== Hero 封面区 ===== */
.page-about .about-hero {
  background:
    radial-gradient(circle at 78% 18%, rgba(255, 107, 0, 0.12), transparent 32%),
    var(--color-primary);
  padding: 64px 0 72px;
  color: var(--color-white);
  border-bottom: 2px solid var(--color-accent);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(var(--about-grid-dot) 1px, transparent 1px),
    radial-gradient(var(--about-grid-dot) 1px, transparent 1px);
  background-size: 28px 28px;
  background-position: 0 0, 14px 14px;
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-hero-lines {
  position: absolute;
  right: -8%;
  top: -10%;
  width: 64%;
  height: 130%;
  background: repeating-linear-gradient(
    -36deg,
    transparent 0,
    transparent 22px,
    var(--about-hero-line) 22px,
    var(--about-hero-line) 23px
  );
  pointer-events: none;
}

.page-about .about-hero-layout {
  display: grid;
  gap: 40px;
}

.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.4px;
  color: var(--color-muted);
  margin-bottom: 28px;
}

.page-about .about-crumb a {
  color: var(--color-silver);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .about-crumb a:hover {
  color: var(--color-white);
}

.page-about .about-crumb-current {
  color: var(--color-white);
  border-left: 1px solid rgba(255, 255, 255, 0.3);
  padding-left: 10px;
}

.page-about .about-hero-kicker {
  display: inline-block;
  padding: 5px 12px;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 2px;
  border-radius: 4px;
  margin-bottom: 18px;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: clamp(1.8rem, 4.2vw, 3.2rem);
  line-height: 1.18;
  margin: 0 0 24px;
  max-width: 720px;
  text-wrap: balance;
}

.page-about .about-hero-lead {
  font-size: 16px;
  line-height: 1.95;
  color: rgba(255, 255, 255, 0.8);
  margin: 0 0 34px;
  max-width: 640px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-btn-solid,
.page-about .about-btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 6px;
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-btn-solid {
  background: var(--color-accent);
  color: var(--color-white);
  border: 1px solid var(--color-accent);
}

.page-about .about-btn-ghost {
  background: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.45);
}

.page-about .about-btn-solid:hover,
.page-about .about-btn-ghost:hover {
  transform: translateY(-2px);
}

.page-about .about-btn-solid:hover {
  background: #e05e00;
}

.page-about .about-btn-ghost:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.06);
}

/* Hero 右侧状态面板 */
.page-about .about-hero-panel {
  position: relative;
  border: 1px solid rgba(192, 192, 192, 0.4);
  border-radius: 22px 10px 22px 10px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  padding: 24px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(6px);
}

.page-about .about-panel-code {
  display: block;
  font-family: var(--font-number);
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--color-accent);
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.page-about .about-panel-list {
  display: grid;
  gap: 18px;
  margin: 0;
}

.page-about .about-panel-item {
  display: grid;
  gap: 4px;
}

.page-about .about-panel-item dt {
  font-family: var(--font-number);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: rgba(255, 255, 255, 0.55);
}

.page-about .about-panel-item dd {
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-white);
  line-height: 1.5;
}

.page-about .about-panel-note {
  display: block;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed rgba(255, 255, 255, 0.2);
  font-size: 13px;
  color: var(--color-silver);
  line-height: 1.7;
}

/* ===== 通用章节头 ===== */
.page-about .about-section,
.page-about .about-stat-section,
.page-about .about-version-section,
.page-about .about-trust-section {
  padding: 72px 0;
}

.page-about .about-section-heading {
  max-width: 720px;
  margin-bottom: 48px;
}

.page-about .about-kicker {
  display: inline-block;
  font-family: var(--font-number);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--color-accent);
  border-left: 4px solid var(--color-accent);
  padding-left: 10px;
  margin-bottom: 12px;
}

.page-about .about-kicker--light {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

.page-about .about-section-heading h2,
.page-about .about-stat-intro h2,
.page-about .about-version-intro h2 {
  font-family: var(--font-heading);
  font-style: italic;
  color: var(--color-primary);
  font-size: clamp(1.65rem, 3vw, 2.4rem);
  line-height: 1.3;
  margin: 0 0 16px;
}

.page-about .about-section-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-gray);
  margin: 0;
}

/* ===== 品牌理念区 ===== */
.page-about .about-concept-grid {
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-concept-copy p {
  margin: 0 0 18px;
  line-height: 1.9;
  font-size: 16px;
}

.page-about .about-concept-copy .about-concept-lead {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-primary);
}

.page-about .about-concept-visual img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 24px 10px 24px 10px;
  clip-path: polygon(0 0, 84% 0, 100% 16%, 100% 100%, 0 100%);
  box-shadow: var(--shadow);
}

.page-about .about-value-list {
  display: grid;
  gap: 16px;
  margin-top: 64px;
}

.page-about .about-value-card {
  position: relative;
  background: var(--color-off-white);
  border: 1px solid var(--color-gray-light);
  border-radius: 22px 10px 22px 10px;
  padding: 26px 24px 24px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-value-card::after {
  content: "";
  position: absolute;
  top: -1px;
  right: 26px;
  width: 18px;
  height: 18px;
  background: var(--color-accent);
  transform: rotate(45deg);
  border-radius: 3px;
}

.page-about .about-value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-light);
  border-color: rgba(10, 31, 68, 0.28);
}

.page-about .about-value-no {
  display: block;
  font-family: var(--font-number);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.page-about .about-value-card h3 {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 20px;
  color: var(--color-primary);
  margin: 0 0 12px;
}

.page-about .about-value-card p {
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 18px;
}

.page-about .about-value-link,
.page-about .about-link-arrow {
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease);
}

.page-about .about-value-link:hover,
.page-about .about-link-arrow:hover {
  color: var(--color-accent);
}

/* ===== 时间线区 ===== */
.page-about .about-timeline-wrap {
  background: var(--color-off-white);
  padding: 72px 0 80px;
}

.page-about .about-timeline-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 300px;
  object-fit: cover;
  object-position: center;
  opacity: 0.22;
  pointer-events: none;
}

.page-about .about-timeline-wrap .container {
  position: relative;
  z-index: 2;
}

.page-about .about-timeline-heading {
  margin-bottom: 28px;
}

.page-about .about-timeline-rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 2px 20px;
  margin-bottom: 8px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .about-timeline-rail a {
  flex: 0 0 auto;
  scroll-snap-align: start;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid rgba(10, 31, 68, 0.22);
  background: rgba(255, 255, 255, 0.72);
  font-family: var(--font-number);
  font-size: 13px;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-timeline-rail a:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 26px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--color-primary) 0%, var(--color-accent) 100%);
  opacity: 0.25;
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 68px;
  margin-bottom: 44px;
  scroll-margin-top: 30px;
}

.page-about .about-timeline-item:last-child {
  margin-bottom: 0;
}

.page-about .about-timeline-node {
  position: absolute;
  left: 0;
  top: 0;
  width: 54px;
  text-align: center;
}

.page-about .about-timeline-dot {
  display: block;
  width: 16px;
  height: 16px;
  margin: 0 auto 10px;
  background: var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(255, 107, 0, 0.16);
}

.page-about .about-timeline-index {
  display: block;
  font-family: var(--font-number);
  font-weight: 700;
  font-size: 14px;
  color: var(--color-primary);
}

.page-about .about-timeline-body {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--color-gray-light);
  border-radius: 20px 8px 20px 8px;
  padding: 22px 24px;
  box-shadow: var(--shadow-light);
}

.page-about .about-timeline-head {
  display: inline-block;
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--color-accent);
  background: rgba(255, 107, 0, 0.08);
  border-radius: 999px;
  padding: 4px 10px;
  margin-bottom: 12px;
}

.page-about .about-timeline-body h3 {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 21px;
  color: var(--color-primary);
  margin: 0 0 10px;
}

.page-about .about-timeline-body p {
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  max-width: 680px;
}

/* ===== 核心数据区 ===== */
.page-about .about-stat-section {
  background:
    radial-gradient(circle at 82% 12%, rgba(255, 107, 0, 0.1), transparent 34%),
    var(--color-primary-deep);
  color: var(--color-white);
  overflow: hidden;
}

.page-about .about-stat-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 30px 30px;
  pointer-events: none;
}

.page-about .about-stat-panel {
  display: grid;
  gap: 40px;
}

.page-about .about-stat-intro h2 {
  color: var(--color-white);
}

.page-about .about-stat-intro p {
  color: rgba(255, 255, 255, 0.68);
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  max-width: 380px;
}

.page-about .about-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 0;
}

.page-about .about-stat-cell {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 158px;
  border: 1px solid rgba(192, 192, 192, 0.28);
  border-radius: 20px 8px 20px 8px;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.01));
  padding: 20px 18px;
}

.page-about .about-stat-cell::after {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  background: var(--color-accent);
  border-radius: 0 3px 3px 0;
}

.page-about .about-stat-cell dt {
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 1.2px;
  color: rgba(255, 255, 255, 0.55);
  text-transform: uppercase;
}

.page-about .about-stat-cell dd {
  margin: 10px 0 8px;
  font-family: var(--font-number);
  font-style: normal;
  font-weight: 700;
  font-size: clamp(1.8rem, 3.8vw, 2.8rem);
  color: var(--color-accent);
  line-height: 1.1;
}

.page-about .about-stat-cell span {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
  line-height: 1.6;
}

/* ===== 版本演进区 ===== */
.page-about .about-version-section {
  background: var(--color-white);
}

.page-about .about-version-layout {
  display: grid;
  gap: 44px;
}

.page-about .about-version-intro {
  max-width: 420px;
}

.page-about .about-version-intro img {
  width: 200px;
  height: 200px;
  object-fit: cover;
  border-radius: 24px 10px 24px 10px;
  border: 1px solid var(--color-silver);
  margin: 28px 0 24px;
  box-shadow: var(--shadow-light);
}

.page-about .about-version-intro p {
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 22px;
}

.page-about .about-version-list {
  border-top: 1px solid var(--color-gray-light);
}

.page-about .about-version-row {
  border-bottom: 1px solid var(--color-gray-light);
}

.page-about .about-version-row summary {
  display: grid;
  grid-template-columns: 68px 1fr 28px;
  gap: 6px 14px;
  align-items: center;
  padding: 22px 4px;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.2s var(--ease);
}

.page-about .about-version-row summary:hover {
  background: rgba(245, 245, 245, 0.6);
}

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

.page-about .about-version-code {
  font-family: var(--font-number);
  font-weight: 700;
  font-size: 16px;
  color: var(--color-accent);
  grid-row: span 2;
}

.page-about .about-version-name {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 19px;
  color: var(--color-primary);
}

.page-about .about-version-desc {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-gray);
  padding-bottom: 2px;
}

.page-about .about-version-toggle {
  grid-row: span 2;
  justify-self: end;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-gray-light);
  border-radius: 50%;
  transition: transform 0.25s var(--ease), background-color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-version-toggle::before {
  content: "+";
  font-family: var(--font-number);
  font-size: 18px;
  line-height: 1;
  color: var(--color-primary);
}

.page-about .about-version-row[open] .about-version-toggle {
  transform: rotate(180deg);
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.page-about .about-version-row[open] .about-version-toggle::before {
  content: "−";
  color: var(--color-white);
}

.page-about .about-version-detail {
  padding: 0 4px 24px 82px;
  max-width: 660px;
}

.page-about .about-version-detail p {
  font-size: 15px;
  line-height: 1.85;
  margin: 0;
  color: var(--color-gray);
  border-left: 3px solid var(--color-accent);
  padding-left: 16px;
}

/* ===== 品牌承诺区 ===== */
.page-about .about-trust-section {
  padding-top: 8px;
  background: var(--color-white);
}

.page-about .about-trust-card {
  position: relative;
  display: grid;
  gap: 28px;
  background: var(--color-off-white);
  border: 1px solid var(--color-gray-light);
  border-radius: 26px 12px 26px 12px;
  padding: 40px 32px;
  overflow: hidden;
}

.page-about .about-trust-card::before {
  content: "";
  position: absolute;
  right: -40px;
  top: -40px;
  width: 150px;
  height: 150px;
  background: var(--color-accent);
  opacity: 0.1;
  border-radius: 50%;
}

.page-about .about-trust-copy h2 {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  color: var(--color-primary);
  line-height: 1.35;
  margin: 0 0 14px;
  max-width: 640px;
}

.page-about .about-trust-copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray);
  max-width: 680px;
}

.page-about .about-trust-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .about-trust-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-trust-links a:first-child {
  background: var(--color-accent);
  color: var(--color-white);
}

.page-about .about-trust-links a:last-child {
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.page-about .about-trust-links a:hover {
  transform: translateY(-2px);
}

/* ===== 桌面增强 ===== */
@media (min-width: 640px) {
  .page-about .about-stat-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-stat-cell {
    min-height: 170px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 96px 0 104px;
  }

  .page-about .about-hero-layout {
    grid-template-columns: 1.5fr 0.85fr;
    gap: 64px;
    align-items: end;
  }

  .page-about .about-hero-panel {
    margin-bottom: 6px;
  }

  .page-about .about-hero-lead {
    font-size: 17px;
  }

  .page-about .about-section,
  .page-about .about-stat-section,
  .page-about .about-version-section {
    padding: 96px 0;
  }

  .page-about .about-concept-grid {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }

  .page-about .about-value-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 80px;
  }

  .page-about .about-timeline-rail {
    padding-bottom: 28px;
    margin-bottom: 12px;
  }

  .page-about .about-timeline-item {
    padding-left: 96px;
    margin-bottom: 56px;
  }

  .page-about .about-timeline-node {
    width: 72px;
  }

  .page-about .about-timeline::before {
    left: 35px;
  }

  .page-about .about-timeline-dot {
    width: 18px;
    height: 18px;
  }

  .page-about .about-timeline-index {
    font-size: 16px;
  }

  .page-about .about-timeline-body {
    padding: 28px 32px;
  }

  .page-about .about-timeline-body h3 {
    font-size: 23px;
  }

  .page-about .about-stat-panel {
    grid-template-columns: 0.8fr 1.7fr;
    gap: 60px;
    align-items: center;
  }

  .page-about .about-version-layout {
    grid-template-columns: 0.8fr 1.5fr;
    gap: 60px;
  }

  .page-about .about-version-row summary {
    grid-template-columns: 90px 170px 1fr 30px;
    gap: 18px;
    padding: 24px 8px;
  }

  .page-about .about-version-desc {
    grid-column: auto;
    padding-bottom: 0;
  }

  .page-about .about-version-detail {
    padding-left: 96px;
  }

  .page-about .about-trust-card {
    grid-template-columns: 1fr auto;
    gap: 40px;
    align-items: center;
    padding: 48px 44px;
  }
}