/* ===== 品牌概况页专属样式 ===== */
.page-about {
  color: var(--tbo-ink);
}

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

/* ---- 首屏 ---- */
.page-about .ab-hero {
  position: relative;
  padding: 3.5rem 0 4rem;
  background: linear-gradient(135deg, var(--tbo-green-deep) 0%, var(--tbo-green) 68%, #0a5543 100%);
  color: var(--tbo-white);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 100%;
  background: var(--tbo-gold);
  clip-path: polygon(100% 0, 100% 100%, 62% 100%, 0 0);
  opacity: 0.07;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -60px;
  width: 200px;
  height: 200px;
  border: 18px solid var(--tbo-gold);
  border-radius: 50%;
  opacity: 0.16;
}

.page-about .ab-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero .breadcrumbs {
  margin-bottom: 2.25rem;
}

.page-about .ab-hero .breadcrumbs a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
}

.page-about .ab-hero .breadcrumbs a:hover {
  color: var(--tbo-gold);
}

.page-about .ab-hero-index {
  font-family: var(--tbo-font-index);
  font-size: 0.78rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--tbo-gold);
  margin: 0 0 1rem;
}

.page-about .ab-hero h1 {
  font-family: var(--tbo-font-heading);
  font-weight: 100;
  font-size: 2.1rem;
  line-height: 1.3;
  letter-spacing: 1px;
  margin: 0 0 1.25rem;
  max-width: 16em;
}

.page-about .ab-hero-lead {
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.86);
  max-width: 46em;
  margin: 0;
}

.page-about .ab-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .ab-meta-item strong {
  color: var(--tbo-gold);
  font-weight: 600;
  margin-right: 0.2rem;
  font-family: var(--tbo-font-index);
  font-size: 1rem;
}

/* ---- 我们是谁 ---- */
.page-about .ab-who {
  padding: 4.5rem 0;
  background: var(--tbo-white);
}

.page-about .ab-who-grid {
  display: grid;
  gap: 2.5rem;
}

.page-about .ab-who-copy .section-index {
  color: var(--tbo-gold);
}

.page-about .ab-who-copy h2 {
  font-family: var(--tbo-font-heading);
  font-weight: 100;
  font-size: 2rem;
  line-height: 1.3;
  color: var(--tbo-green);
  letter-spacing: 1px;
  margin: 0.4rem 0 1.25rem;
}

.page-about .ab-who-copy p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--tbo-gray);
  margin: 0 0 1rem;
}

.page-about .ab-who-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about .ab-fact-card {
  background: var(--tbo-paper);
  border-radius: var(--tbo-radius);
  padding: 1.25rem 1.1rem;
  border-top: 3px solid var(--tbo-gold);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .ab-fact-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--tbo-shadow);
}

.page-about .ab-fact-num {
  font-family: var(--tbo-font-index);
  font-size: 1.7rem;
  color: var(--tbo-green);
  font-weight: 600;
  letter-spacing: 1px;
}

.page-about .ab-fact-label {
  font-size: 0.88rem;
  color: var(--tbo-gray);
  line-height: 1.5;
}

/* ---- 章节头 ---- */
.page-about .section-head {
  margin-bottom: 2.5rem;
}

.page-about .section-head .section-index {
  color: var(--tbo-gold);
  font-weight: 400;
}

.page-about .section-head .section-title {
  font-weight: 100;
  font-size: 2rem;
  color: var(--tbo-green);
  margin-top: 0.5rem;
  letter-spacing: 1px;
}

.page-about .section-head .section-sub {
  color: var(--tbo-gray);
  margin-top: 0.6rem;
}

/* ---- 发展历程 ---- */
.page-about .ab-milestone {
  padding: 4.5rem 0;
  background: var(--tbo-paper);
}

.page-about .ab-timeline-wrap {
  display: grid;
  gap: 2rem;
}

.page-about .ab-timeline {
  position: relative;
  padding-left: 1.6rem;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--tbo-gold), rgba(201, 162, 39, 0.2));
}

.page-about .ab-tl-item {
  position: relative;
  margin-bottom: 1.75rem;
}

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

.page-about .ab-tl-dot {
  position: absolute;
  left: -1.6rem;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--tbo-gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, 0.22);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .ab-tl-item:hover .ab-tl-dot {
  transform: scale(1.25);
  box-shadow: 0 0 0 6px rgba(201, 162, 39, 0.15);
}

.page-about .ab-tl-date {
  display: block;
  font-family: var(--tbo-font-index);
  font-size: 0.9rem;
  letter-spacing: 2px;
  color: var(--tbo-gold);
  margin-bottom: 0.4rem;
}

.page-about .ab-tl-card {
  background: var(--tbo-white);
  border-radius: var(--tbo-radius);
  padding: 1.2rem 1.25rem;
  border-left: 3px solid var(--tbo-gold);
  box-shadow: 0 2px 10px rgba(0, 35, 27, 0.05);
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .ab-tl-card:hover {
  background: var(--tbo-white);
  transform: translateX(5px);
  box-shadow: var(--tbo-shadow);
}

.page-about .ab-tl-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--tbo-ink);
  margin: 0 0 0.4rem;
}

.page-about .ab-tl-card p {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--tbo-gray);
  margin: 0;
}

.page-about .ab-tl-art {
  margin: 0;
  background: var(--tbo-white);
  border-radius: var(--tbo-radius);
  padding: 0.8rem;
  box-shadow: var(--tbo-shadow);
  align-self: center;
}

.page-about .ab-tl-art img {
  display: block;
  width: 100%;
  object-fit: cover;
  border-radius: 3px;
}

.page-about .ab-tl-art figcaption {
  margin-top: 0.6rem;
  font-family: var(--tbo-font-index);
  font-size: 0.72rem;
  letter-spacing: 1px;
  color: var(--tbo-gray);
  text-align: center;
  line-height: 1.5;
}

/* ---- 服务能力 ---- */
.page-about .ab-capability {
  padding: 4.5rem 0;
  background: var(--tbo-white);
}

.page-about .ab-cap-grid {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.page-about .ab-cap-card {
  display: block;
  position: relative;
  text-decoration: none;
  background: var(--tbo-paper);
  border-radius: var(--tbo-radius);
  padding: 1.75rem 1.5rem;
  overflow: hidden;
  transition: background 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .ab-cap-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--tbo-gold), var(--tbo-gold-soft));
  transform: scaleX(0.3);
  transform-origin: left center;
  transition: transform 0.3s ease;
}

.page-about .ab-cap-card:hover {
  background: var(--tbo-white);
  transform: translateY(-4px);
  box-shadow: var(--tbo-shadow);
}

.page-about .ab-cap-card:hover::before {
  transform: scaleX(1);
}

.page-about .ab-cap-num {
  font-family: var(--tbo-font-index);
  font-size: 0.8rem;
  letter-spacing: 2px;
  color: var(--tbo-gold);
  display: block;
  margin-bottom: 0.75rem;
}

.page-about .ab-cap-card h3 {
  font-family: var(--tbo-font-heading);
  font-size: 1.35rem;
  font-weight: 300;
  color: var(--tbo-green);
  margin: 0 0 0.6rem;
}

.page-about .ab-cap-card p {
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--tbo-gray);
  margin: 0 0 1rem;
}

.page-about .ab-cap-more {
  font-family: var(--tbo-font-index);
  font-size: 0.78rem;
  letter-spacing: 1px;
  color: var(--tbo-green);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.page-about .ab-cap-more::after {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--tbo-gold);
  transition: width 0.25s ease;
}

.page-about .ab-cap-card:hover .ab-cap-more::after {
  width: 34px;
}

.page-about .ab-cap-figure {
  margin: 0;
  background: var(--tbo-green);
  padding: 1rem;
  border-radius: var(--tbo-radius);
}

.page-about .ab-cap-figure img {
  display: block;
  width: 100%;
  object-fit: cover;
  border-radius: 3px;
}

.page-about .ab-cap-figure figcaption {
  color: rgba(255, 255, 255, 0.8);
}

.page-about .ab-cap-figure figcaption {
  margin-top: 0.6rem;
  font-family: var(--tbo-font-index);
  font-size: 0.72rem;
  letter-spacing: 1px;
  text-align: center;
  line-height: 1.5;
}

/* ---- 数据来源与质量 ---- */
.page-about .ab-quality {
  padding: 4.5rem 0;
  background: var(--tbo-paper);
}

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

.page-about .ab-quality-copy .section-index {
  color: var(--tbo-gold);
}

.page-about .ab-quality-copy h2 {
  font-family: var(--tbo-font-heading);
  font-weight: 100;
  font-size: 2rem;
  line-height: 1.3;
  color: var(--tbo-green);
  letter-spacing: 1px;
  margin: 0.4rem 0 1.1rem;
}

.page-about .ab-quality-copy > p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--tbo-gray);
  margin: 0 0 1.5rem;
}

.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .ab-flow-step {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  background: var(--tbo-white);
  padding: 1rem 1.1rem;
  border-radius: var(--tbo-radius);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.page-about .ab-flow-step:hover {
  background: var(--tbo-white);
  box-shadow: var(--tbo-shadow);
}

.page-about .ab-flow-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--tbo-gold);
  color: var(--tbo-white);
  font-family: var(--tbo-font-index);
  font-size: 0.85rem;
  font-weight: 600;
  flex-shrink: 0;
}

.page-about .ab-flow-step h3 {
  margin: 0 0 0.25rem;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--tbo-ink);
}

.page-about .ab-flow-step p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--tbo-gray);
  line-height: 1.6;
}

.page-about .ab-quality-figure {
  margin: 0;
  background: var(--tbo-white);
  padding: 0.8rem;
  border-radius: var(--tbo-radius);
  box-shadow: var(--tbo-shadow);
  align-self: center;
}

.page-about .ab-quality-figure img {
  display: block;
  width: 100%;
  object-fit: cover;
  border-radius: 3px;
}

.page-about .ab-quality-figure figcaption {
  margin-top: 0.6rem;
  font-family: var(--tbo-font-index);
  font-size: 0.72rem;
  letter-spacing: 1px;
  color: var(--tbo-gray);
  text-align: center;
  line-height: 1.5;
}

/* ---- 资质与合作 ---- */
.page-about .ab-license {
  padding: 4.5rem 0;
  background: var(--tbo-white);
}

.page-about .ab-license-panel {
  background: linear-gradient(135deg, var(--tbo-green-deep), var(--tbo-green));
  border-radius: calc(var(--tbo-radius) * 2);
  color: var(--tbo-white);
  padding: 2rem 1.5rem;
  position: relative;
  overflow: hidden;
}

.page-about .ab-license-panel::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 24px solid var(--tbo-gold);
  opacity: 0.12;
}

.page-about .ab-license-row {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.3rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about .ab-license-row:last-of-type {
  border-bottom: none;
}

.page-about .ab-license-row h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
  color: var(--tbo-gold);
}

.page-about .ab-license-row p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .ab-license-icp {
  font-family: var(--tbo-font-index);
  font-size: 1.05rem;
  letter-spacing: 1px;
  color: var(--tbo-white);
  background: rgba(201, 162, 39, 0.18);
  padding: 0.5rem 0.9rem;
  border-radius: var(--tbo-radius);
  justify-self: start;
}

.page-about .ab-license-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.4rem;
}

.page-about .ab-license-actions a {
  color: var(--tbo-gold-soft);
  text-decoration: none;
  font-family: var(--tbo-font-index);
  font-size: 0.8rem;
  letter-spacing: 1px;
  border: 1px solid rgba(201, 162, 39, 0.5);
  padding: 0.5rem 0.9rem;
  border-radius: var(--tbo-radius);
  transition: background 0.2s ease, color 0.2s ease;
}

.page-about .ab-license-actions a:hover {
  background: var(--tbo-gold);
  color: var(--tbo-white);
  border-color: var(--tbo-gold);
}

/* ---- 联系我们 ---- */
.page-about .ab-contact {
  padding: 4.5rem 0;
  background: var(--tbo-paper);
}

.page-about .ab-contact-grid {
  display: grid;
  gap: 1rem;
}

.page-about .ab-contact-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  background: var(--tbo-white);
  padding: 1.3rem 1.4rem;
  border-radius: var(--tbo-radius);
  border-left: 3px solid var(--tbo-gold);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .ab-contact-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--tbo-shadow);
}

.page-about .ab-contact-label {
  font-family: var(--tbo-font-index);
  font-size: 0.72rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--tbo-gold);
}

.page-about .ab-contact-value {
  font-size: 0.98rem;
  color: var(--tbo-ink);
  line-height: 1.6;
  word-break: break-word;
}

.page-about .ab-contact-cta {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
}

.page-about .btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--tbo-gold);
  color: var(--tbo-white);
  padding: 0.8rem 1.6rem;
  border-radius: var(--tbo-radius);
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s ease, transform 0.2s ease;
}

.page-about .btn-primary:hover {
  background: var(--tbo-gold-soft);
  transform: translateY(-2px);
}

/* ---- 平板与桌面 ---- */
@media (min-width: 768px) {
  .page-about .ab-hero {
    padding: 5rem 0 6rem;
  }

  .page-about .ab-hero h1 {
    font-size: 2.6rem;
  }

  .page-about .ab-hero-lead {
    font-size: 1.05rem;
  }

  .page-about .ab-who-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

  .page-about .ab-timeline-wrap {
    grid-template-columns: 1fr 260px;
    gap: 2.5rem;
    align-items: center;
  }

  .page-about .ab-timeline {
    padding-left: 0;
    padding-bottom: 0.5rem;
  }

  .page-about .ab-timeline::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-about .ab-tl-item {
    width: calc(50% - 2.5rem);
    margin-bottom: 2rem;
  }

  .page-about .ab-tl-item:nth-child(odd) {
    margin-right: auto;
    text-align: right;
  }

  .page-about .ab-tl-item:nth-child(even) {
    margin-left: auto;
    text-align: left;
  }

  .page-about .ab-tl-dot {
    left: auto;
    right: -2.5rem;
    margin-right: -6px;
  }

  .page-about .ab-tl-item:nth-child(even) .ab-tl-dot {
    right: auto;
    left: -2.5rem;
    margin-left: -6px;
  }

  .page-about .ab-tl-card {
    border-left: 3px solid var(--tbo-gold);
  }

  .page-about .ab-tl-item:nth-child(odd) .ab-tl-card {
    border-left: 0;
    border-right: 3px solid var(--tbo-gold);
  }

  .page-about .ab-cap-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .page-about .ab-quality-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 2.5rem;
    align-items: center;
  }

  .page-about .ab-license-panel {
    padding: 2.5rem;
  }

  .page-about .ab-license-row {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .page-about .ab-contact-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-hero {
    padding: 6rem 0 7rem;
  }

  .page-about .ab-hero h1 {
    font-size: 3rem;
    max-width: 12em;
  }

  .page-about .ab-hero-lead {
    max-width: 36em;
  }

  .page-about .section-head .section-title {
    font-size: 2.4rem;
  }

  .page-about .ab-who-copy h2,
  .page-about .ab-quality-copy h2 {
    font-size: 2.3rem;
  }

  .page-about .ab-timeline-wrap {
    grid-template-columns: 1fr 300px;
  }

  .page-about .ab-cap-grid {
    gap: 2rem;
  }

  .page-about .ab-cap-card {
    padding: 2rem 1.8rem;
  }

  .page-about .ab-contact-grid {
    gap: 1.5rem;
  }
}