.page-about {
  --about-panel-green: #E3EDE4;
  --about-panel-blue: #D6E0EA;
  --about-deep-line: #0F2027;
  --about-gold-accent: #D4AF37;
  --about-warn: #C99700;
  --about-charcoal: #2B2B2B;
  --about-milk: #F4F4F0;
  --about-steppe: #3A7D44;
  --about-tech: #1E3A8A;
  color: var(--about-charcoal);
}

.page-about .container {
  max-width: 1280px;
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* 面包屑 */
.page-about .breadcrumb {
  margin-bottom: 1.25rem;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: .875rem;
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.page-about .breadcrumb li:not(:last-child)::after {
  content: "›";
  color: var(--about-gold-accent);
}

.page-about .breadcrumb a {
  color: var(--about-steppe);
  text-decoration: none;
  font-weight: 500;
}

.page-about .breadcrumb a:hover {
  color: var(--about-tech);
  text-decoration: underline;
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--about-charcoal);
  font-weight: 600;
}

/* 章节标签与标题 */
.page-about .section-label {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin: 0 0 .75rem;
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--about-tech);
}

.page-about .section-label span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 2rem;
  padding: 0 .375rem;
  background: var(--about-steppe);
  color: #fff;
  font-size: .875rem;
  font-weight: 700;
  border-radius: 4px 14px 4px 14px;
}

.page-about .section-title {
  font-family: var(--font-head);
  font-size: 2rem;
  line-height: 1.25;
  font-weight: 700;
  margin: 0 0 1.25rem;
  color: var(--about-charcoal);
}

@media (min-width: 768px) {
  .page-about .section-title {
    font-size: 2.5rem;
  }
}

/* 首屏品牌宣言区 */
.page-about .about-hero {
  position: relative;
  background:
    linear-gradient(135deg, rgba(15, 32, 39, .92), rgba(30, 58, 138, .86)),
    repeating-linear-gradient(45deg, transparent 0 14px, rgba(212, 175, 55, .08) 14px 16px);
  color: #fff;
  padding: 4rem 0 4.5rem;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -4rem;
  right: -6rem;
  width: 18rem;
  height: 18rem;
  border: 2px solid rgba(212, 175, 55, .35);
  border-radius: 50%;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: 2rem;
  left: -3rem;
  width: 8rem;
  height: 8rem;
  background: rgba(212, 175, 55, .15);
  transform: rotate(18deg);
  clip-path: polygon(0 0, 75% 0, 100% 100%, 15% 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.1fr .9fr;
    align-items: center;
    gap: 4rem;
  }
}

.page-about .about-hero__text {
  max-width: 42rem;
}

.page-about .about-hero__text .breadcrumb {
  color: rgba(255, 255, 255, .75);
}

.page-about .about-hero__text .breadcrumb li:not(:last-child)::after {
  color: var(--about-gold-accent);
}

.page-about .about-hero__text .breadcrumb a {
  color: rgba(255, 255, 255, .85);
}

.page-about .about-hero__text .breadcrumb a:hover {
  color: var(--about-gold-accent);
}

.page-about .about-hero__text .breadcrumb [aria-current="page"] {
  color: #fff;
}

.page-about .about-hero__text .section-label {
  color: var(--about-gold-accent);
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.15;
  margin: 0 0 1.25rem;
  font-weight: 900;
  letter-spacing: .02em;
}

.page-about .about-hero__lead {
  font-size: 1.125rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, .86);
  margin: 0 0 2rem;
}

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

.page-about .about-hero__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 18px 52px 18px 52px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .35);
  object-fit: cover;
}

/* 我们是谁 */
.page-about .about-intro {
  padding: 4.5rem 0;
  background: var(--about-milk);
}

.page-about .about-intro__grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 900px) {
  .page-about .about-intro__grid {
    grid-template-columns: .85fr 1.15fr;
    gap: 4rem;
    align-items: start;
  }
}

.page-about .about-intro__left .section-title {
  margin-bottom: 0;
}

.page-about .about-intro__right {
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .about-intro__right p {
  margin: 0 0 1.25rem;
}

.page-about .about-intro__right strong {
  color: var(--about-steppe);
  font-weight: 700;
}

.page-about .about-intro__right code,
.page-about .versions-note code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  background: var(--about-blue-gray, #D6E0EA);
  padding: .15em .4em;
  border-radius: 4px;
  font-size: .9em;
}

/* 时间线区域 */
.page-about .about-timeline {
  background:
    linear-gradient(rgba(243, 244, 240, .94), rgba(243, 244, 240, .94)),
    repeating-linear-gradient(-25deg, transparent 0 22px, rgba(212, 175, 55, .12) 22px 24px);
  padding: 4.5rem 0 5rem;
  position: relative;
}

.page-about .about-timeline__head {
  max-width: 720px;
  margin-bottom: 3rem;
}

.page-about .about-timeline__note {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: #3a3a3a;
  margin: 0;
}

.page-about .timeline-list {
  position: relative;
  display: grid;
  gap: 2.25rem;
  margin: 0 0 3rem;
  padding-left: 0;
}

@media (min-width: 820px) {
  .page-about .timeline-list {
    gap: 2.5rem;
  }
}

.page-about .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
}

@media (min-width: 900px) {
  .page-about .timeline-item {
    grid-template-columns: 3.5rem minmax(0, 1fr);
    gap: 2rem;
  }
}

.page-about .timeline-item__marker {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-about .timeline-item__dot {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background: var(--about-gold-accent);
  border: 4px solid var(--about-milk);
  box-shadow: 0 0 0 2px var(--about-gold-accent), 0 0 18px rgba(212, 175, 55, .5);
  margin-top: .625rem;
  flex-shrink: 0;
}

.page-about .timeline-item__line {
  width: 3px;
  background: linear-gradient(180deg, var(--about-gold-accent), var(--about-blue-gray, #D6E0EA));
  border-radius: 999px;
  margin: .5rem 0;
}

@media (min-width: 900px) {
  .page-about .timeline-item__line {
    margin: .75rem 0;
  }
}

.page-about .timeline-item__line {
  flex: 1;
}

.page-about .timeline-item:last-child .timeline-item__line {
  display: none;
}

.page-about .timeline-item__card {
  padding: 1.5rem 1.25rem;
  border-radius: 12px 36px 12px 36px;
  background: var(--about-green-gray, #E3EDE4);
  box-shadow: var(--shadow-soft);
  border-left: 6px solid var(--about-steppe);
  transition: transform .2s ease, box-shadow .2s ease;
}

.page-about .timeline-item__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(15, 32, 39, .14);
}

@media (min-width: 700px) {
  .page-about .timeline-item__card {
    padding: 2rem 2.25rem;
  }
}

.page-about .steppe-card--blue {
  background: var(--about-blue-gray, #D6E0EA);
  border-left-color: var(--about-tech);
}

.page-about .timeline-item__tag {
  display: inline-block;
  margin-bottom: .875rem;
  padding: .3rem .75rem;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .06em;
  border-radius: 999px;
}

.page-about .tag--green {
  background: var(--about-green-gray, #E3EDE4);
  color: var(--about-steppe);
}

.page-about .tag--gold {
  background: var(--about-gold-accent);
  color: #1a1a1a;
}

.page-about .timeline-item__title {
  font-family: var(--font-head);
  font-size: 1.5rem;
  line-height: 1.35;
  margin: 0 0 .75rem;
  color: var(--about-charcoal);
}

.page-about .timeline-item__card p {
  margin: 0;
  line-height: 1.85;
  font-size: 1rem;
}

.page-about .about-timeline__figure {
  margin: 0;
  max-width: 26rem;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 14px 44px 14px 44px;
  box-shadow: var(--shadow-soft);
}

/* 版本演进对比 */
.page-about .about-versions {
  padding: 4.5rem 0;
  background: var(--about-milk);
}

.page-about .about-versions__head {
  margin-bottom: 2rem;
}

.page-about .about-versions__head .section-title {
  max-width: 560px;
}

.page-about .versions-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: 12px 34px 12px 34px;
  box-shadow: var(--shadow-soft);
  background: #fff;
}

.page-about .versions-table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
  font-size: .925rem;
  line-height: 1.6;
}

.page-about .versions-table th,
.page-about .versions-table td {
  text-align: left;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(15, 32, 39, .08);
  vertical-align: top;
}

.page-about .versions-table thead th {
  background: var(--about-deep-line);
  color: var(--about-milk);
  font-weight: 700;
  font-size: .9rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.page-about .versions-table thead th:first-child {
  border-top-left-radius: 12px;
}

.page-about .versions-table thead th:last-child {
  border-top-right-radius: 34px;
}

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

.page-about .versions-table tbody tr:nth-child(even) {
  background: var(--about-green-gray, #E3EDE4);
}

.page-about .versions-table tbody td:first-child {
  font-weight: 800;
  font-family: var(--font-head);
  color: var(--about-tech);
  white-space: nowrap;
}

.page-about .versions-table tbody tr:last-child td:first-child {
  color: var(--about-steppe);
}

.page-about .versions-note {
  margin-top: 1.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--about-blue-gray, #D6E0EA);
  border-left: 6px solid var(--about-tech);
  border-radius: 4px 20px 4px 20px;
  line-height: 1.75;
}

.page-about .versions-note p {
  margin: 0;
}

/* 团队与服务 */
.page-about .about-team {
  padding: 4.5rem 0;
  background:
    linear-gradient(rgba(15, 32, 39, .92), rgba(15, 32, 39, .96)),
    repeating-linear-gradient(90deg, transparent 0 44px, rgba(212, 175, 55, .08) 44px 48px);
  color: #fff;
}

.page-about .about-team__grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: 1.1fr .9fr;
    gap: 4rem;
  }
}

.page-about .about-team__content .section-label {
  color: var(--about-gold-accent);
}

.page-about .about-team__content .section-title {
  color: #fff;
}

.page-about .about-team__content p {
  line-height: 1.85;
  color: rgba(255, 255, 255, .82);
  margin: 0 0 1.25rem;
}

.page-about .about-team__content p strong {
  color: #fff;
  font-weight: 700;
}

.page-about .team-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .team-links .btn--ghost {
  border: 1px solid rgba(212, 175, 55, .7);
  color: var(--about-gold-accent);
  padding: .7rem 1.5rem;
  border-radius: 8px 24px 8px 24px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .team-links .btn--ghost:hover {
  background: var(--about-gold-accent);
  color: #1a1a1a;
  border-color: var(--about-gold-accent);
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px 48px 16px 48px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, .3);
}

/* 服务承诺区 */
.page-about .about-promise {
  padding: 4rem 0;
  background: var(--about-green-gray, #E3EDE4);
  position: relative;
}

.page-about .about-promise::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--about-steppe) 0 30%, var(--about-gold-accent) 30% 60%, var(--about-tech) 60% 100%);
}

.page-about .about-promise__inner {
  max-width: 760px;
}

.page-about .about-promise__inner p {
  font-size: 1.0625rem;
  line-height: 1.85;
  margin: 0 0 1.5rem;
}

.page-about .about-promise__points {
  list-style: none;
  padding: 0;
  margin: 0 0 1.75rem;
  display: grid;
  gap: .875rem;
}

.page-about .about-promise__points li {
  position: relative;
  padding-left: 2.25rem;
  line-height: 1.7;
}

.page-about .about-promise__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .5rem;
  width: 1.1rem;
  height: 1.1rem;
  background: var(--about-gold-accent);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.page-about .about-promise__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .75rem;
  font-weight: 600;
}

.page-about .about-promise__links a {
  color: var(--about-tech);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color .2s ease;
}

.page-about .about-promise__links a:hover {
  border-color: var(--about-gold-accent);
}

.page-about .about-promise__sep {
  color: var(--about-warn);
}

/* 移动端优先细节修正 */
@media (max-width: 480px) {
  .page-about .about-hero {
    padding: 3rem 0;
  }

  .page-about .about-hero__img {
    border-radius: 12px 32px 12px 32px;
  }

  .page-about .timeline-item {
    grid-template-columns: 2rem 1fr;
    gap: .75rem;
  }

  .page-about .timeline-item__dot {
    width: 1.1rem;
    height: 1.1rem;
    border-width: 3px;
  }

  .page-about .timeline-item__title {
    font-size: 1.25rem;
  }

  .page-about .versions-table th,
  .page-about .versions-table td {
    padding: .875rem .875rem;
  }
}

@media (min-width: 640px) {
  .page-about .timeline-list {
    padding-left: 0;
  }

  .page-about .about-hero__title {
    letter-spacing: .01em;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .timeline-item__dot {
    animation: about-pulse 3s ease-in-out infinite;
  }

  @keyframes about-pulse {
    0%, 100% {
      box-shadow: 0 0 0 2px var(--about-gold-accent), 0 0 14px rgba(212, 175, 55, .4);
    }
    50% {
      box-shadow: 0 0 0 4px rgba(212, 175, 55, .5), 0 0 26px rgba(212, 175, 55, .65);
    }
  }
}

.page-about {
  --about-blue-gray: transparent;
  --about-green-gray: transparent;
}