.page-about {
  padding-bottom: 64px;
}

.page-about .breadcrumb {
  margin: 18px 0 0;
}

/* ===== 框景简介区 ===== */
.page-about .about-hero {
  margin: 28px 0 48px;
}

.page-about .about-hero__frame {
  position: relative;
  display: grid;
  border: var(--border-w) solid var(--border);
  background: var(--bg-2);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 24px;
  width: 96px;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--accent) 0 8px, transparent 8px 16px);
  z-index: 2;
}

.page-about .about-hero__content {
  position: relative;
  padding: 36px 24px 28px;
}

.page-about .about-hero__kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: 2.1rem;
  line-height: 1.15;
  margin: 14px 0 16px;
  max-width: 14em;
  letter-spacing: 0.02em;
}

.page-about .about-hero__lead {
  color: var(--text);
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 33em;
  margin: 0;
}

.page-about .about-hero__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__side {
  display: none;
}

.page-about .about-hero__media {
  display: block;
  border-top: var(--border-w) solid var(--border);
}

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

.page-about .about-hero__strip {
  display: flex;
  flex-wrap: wrap;
  background: var(--bg-3);
}

.page-about .about-hero__strip span {
  flex: 1 1 45%;
  padding: 14px 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
  box-sizing: border-box;
}

.page-about .about-hero__strip span:nth-child(2n) {
  border-right: 0;
}

.page-about .about-hero__strip span:nth-last-child(-n + 2) {
  border-bottom: 0;
}

/* ===== 主体两栏布局：目录 + 内容 ===== */
.page-about .about-toc {
  display: none;
}

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

/* ===== 章节标题 ===== */
.page-about .about-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin: 56px 0 28px;
}

.page-about .about-section__no {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  line-height: 1.2;
  margin: 0;
}

.page-about .about-section__note {
  flex-basis: 100%;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

/* ===== 发展时间轴 ===== */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 28px;
  padding-left: 0;
}

.page-about .about-timeline__rail {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 67px;
  width: 4px;
  background: var(--border);
  border-radius: 2px;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 56px 26px minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1;
  color: var(--text-dim);
  text-align: right;
  padding-top: 28px;
  letter-spacing: 0.02em;
}

.page-about .about-timeline__node {
  width: 20px;
  height: 20px;
  margin-top: 26px;
  border: 3px solid var(--accent);
  background: var(--bg);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--bg);
  z-index: 1;
  justify-self: center;
  box-sizing: border-box;
}

.page-about .about-timeline__card {
  background: var(--bg-2);
  border: var(--border-w) solid var(--border);
  border-left-width: 5px;
  box-shadow: var(--shadow);
  padding: 20px 18px 18px;
  transition: border-color 0.2s ease;
}

.page-about .about-timeline__card:hover {
  border-color: var(--accent);
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  line-height: 1.25;
  margin: 0 0 10px;
}

.page-about .about-timeline__card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.875rem;
  line-height: 1.75;
}

/* ===== 核心服务口径表 ===== */
.page-about .service-map {
  margin-top: 48px;
  background: var(--bg-2);
  border: var(--border-w) solid var(--border);
  box-shadow: var(--shadow);
  overflow-x: auto;
}

.page-about .service-map__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  align-items: baseline;
  padding: 18px 20px;
  border-bottom: var(--border-w) solid var(--border);
}

.page-about .service-map__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.2;
  margin: 0;
}

.page-about .service-map__note {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-about .service-map__table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
}

.page-about .service-map__table th,
.page-about .service-map__table td {
  text-align: left;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}

.page-about .service-map__table th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  background: rgba(0, 0, 0, 0.22);
}

.page-about .service-map__table td:first-child {
  font-weight: 500;
  color: var(--accent2);
  white-space: nowrap;
}

.page-about .service-map__table tr:last-child td {
  border-bottom: 0;
}

/* ===== 服务理念 ===== */
.page-about .about-pills {
  display: grid;
  gap: 24px;
}

.page-about .about-pill {
  position: relative;
  background: var(--bg-2);
  border: var(--border-w) solid var(--border);
  border-top: 5px solid var(--border);
  padding: 30px 22px 24px;
  transition: border-color 0.2s ease;
}

.page-about .about-pill:hover {
  border-color: var(--accent);
  border-top-color: var(--accent);
}

.page-about .about-pill__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  opacity: 0.75;
  margin-bottom: 14px;
}

.page-about .about-pill h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.2;
  margin: 0 0 10px;
}

.page-about .about-pill p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.875rem;
  line-height: 1.75;
}

/* ===== 团队与能力 ===== */
.page-about .about-team {
  display: grid;
  gap: 32px;
}

.page-about .about-team__text p {
  font-size: 0.9375rem;
  line-height: 1.8;
  margin: 0 0 24px;
  color: var(--text);
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.page-about .about-team__stat {
  background: var(--bg);
  border: var(--border-w) solid var(--border);
  padding: 18px 16px;
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.625rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.page-about .about-team__label {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.page-about .about-team__visual {
  display: grid;
  gap: 28px;
}

.page-about .about-team__img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--border-w) solid var(--border);
  box-shadow: var(--shadow);
}

.page-about .about-team__radar {
  margin: 0;
  background: var(--bg-2);
  border: var(--border-w) solid var(--border);
  padding: 24px 16px 16px;
}

.page-about .radar-chart {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 0 auto;
}

.page-about .radar-chart__grid polygon {
  fill: none;
  stroke: var(--border);
  stroke-width: 1.5;
}

.page-about .radar-chart__grid polygon:first-child {
  stroke-width: 2.5;
}

.page-about .radar-chart__spokes line {
  stroke: var(--border);
  stroke-width: 1;
  opacity: 0.7;
}

.page-about .radar-chart__data {
  fill: rgba(255, 90, 54, 0.25);
  stroke: var(--accent);
  stroke-width: 2.5;
}

.page-about .radar-chart__dots circle {
  fill: var(--accent);
  stroke: var(--bg);
  stroke-width: 2;
}

.page-about .radar-chart__labels text {
  fill: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
}

.page-about .radar-chart__caption {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-top: 12px;
  text-transform: uppercase;
}

/* ===== 资质与认证 ===== */
.page-about .about-qa {
  display: grid;
  gap: 28px;
}

.page-about .about-qa__list {
  display: grid;
  gap: 16px;
}

.page-about .about-qa__item {
  display: flex;
  gap: 16px;
  background: var(--bg-2);
  border: var(--border-w) solid var(--border);
  padding: 16px;
  transition: border-color 0.2s ease;
}

.page-about .about-qa__item:hover {
  border-color: var(--accent);
}

.page-about .about-qa__badge {
  flex: 0 0 48px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 2px solid var(--accent);
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8125rem;
  box-sizing: border-box;
}

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

.page-about .about-qa__info h3 {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  line-height: 1.3;
  margin: 0 0 6px;
}

.page-about .about-qa__info p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.875rem;
  line-height: 1.7;
}

.page-about .about-qa__shield {
  display: block;
  width: 100%;
  max-width: 300px;
  height: auto;
  border: var(--border-w) solid var(--border);
  box-shadow: var(--shadow);
  justify-self: center;
}

/* ===== 页尾转化区 ===== */
.page-about .about-outro {
  display: grid;
  gap: 20px;
  margin-top: 72px;
  padding: 36px 24px;
  background: var(--accent);
  border: var(--border-w) solid var(--bg-3);
  box-shadow: var(--shadow);
}

.page-about .about-outro__title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  line-height: 1.25;
  color: var(--bg);
  margin: 0 0 8px;
}

.page-about .about-outro__desc {
  margin: 0;
  color: var(--bg);
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 58em;
}

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

.page-about .about-outro .btn--primary {
  background: var(--bg);
  border-color: var(--bg);
  color: var(--text);
}

.page-about .about-outro .btn--ghost {
  background: transparent;
  border-color: var(--bg);
  color: var(--bg);
}

/* ===== 桌面端 ===== */
@media (min-width: 800px) {
  .page-about .about-hero__frame {
    grid-template-columns: 1.1fr 1fr;
  }

  .page-about .about-hero__content {
    padding: 44px 36px 36px;
  }

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

  .page-about .about-hero__lead {
    font-size: 1rem;
  }

  .page-about .about-hero__media {
    display: grid;
    grid-template-rows: 1fr auto;
    border-top: 0;
    border-left: var(--border-w) solid var(--border);
  }

  .page-about .about-hero__img {
    height: 100%;
    min-height: 300px;
  }

  .page-about .about-hero__strip span {
    flex: 1 1 50%;
    border-bottom: 0;
    border-top: var(--border-w) solid var(--border);
  }

  .page-about .about-hero__strip span:nth-child(2n) {
    border-right: 0;
  }

  .page-about .about-hero__side {
    display: inline-block;
    position: absolute;
    left: -20px;
    top: 0;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    letter-spacing: 0.18em;
    color: var(--text-dim);
    text-transform: uppercase;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 76px 32px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-timeline__rail {
    left: 91px;
  }

  .page-about .about-timeline__year {
    font-size: 1.125rem;
  }

  .page-about .about-timeline__card {
    padding: 26px 24px 22px;
  }

  .page-about .about-timeline__card h3 {
    font-size: 1.25rem;
  }

  .page-about .about-timeline__card p {
    font-size: 0.9375rem;
  }

  .page-about .about-qa {
    grid-template-columns: 1fr 280px;
    align-items: start;
  }

  .page-about .about-qa__shield {
    justify-self: start;
  }

  .page-about .about-outro {
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: 40px 36px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    background: var(--bg-2);
    border: var(--border-w) solid var(--border);
    box-shadow: var(--shadow);
    padding: 20px 16px 16px;
  }

  .page-about .about-toc__label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    letter-spacing: 0.12em;
    color: var(--accent);
    text-transform: uppercase;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 10px;
  }

  .page-about .about-toc__link {
    display: block;
    padding: 7px 0 7px 12px;
    margin-left: 0;
    border-left: 3px solid transparent;
    color: var(--text-dim);
    font-size: 0.875rem;
    line-height: 1.4;
    text-decoration: none;
    transition: border-color 0.2s ease, color 0.2s ease;
  }

  .page-about .about-toc__link:hover {
    color: var(--text);
    border-left-color: var(--accent2);
  }

  .page-about .about-toc__link.is-active {
    color: var(--accent);
    border-left-color: var(--accent);
  }

  .page-about .about-toc__foot {
    display: block;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--border);
    font-family: var(--font-mono);
    font-size: 0.625rem;
    letter-spacing: 0.06em;
    color: var(--text-dim);
    text-transform: uppercase;
  }

  .page-about .about-section__head {
    margin-top: 64px;
  }

  .page-about .about-section__note {
    flex-basis: auto;
    margin-left: auto;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 112px 44px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .about-timeline__rail {
    left: 132px;
  }

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

  .page-about .about-pills {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .page-about .about-team {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .page-about .about-team__text {
    padding-right: 16px;
  }

  .page-about .about-team__visual {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero__content {
    padding: 56px 44px 44px;
  }

  .page-about .about-hero h1 {
    font-size: 3rem;
  }

  .page-about .about-hero__side {
    left: -28px;
  }

  .page-about .about-qa {
    grid-template-columns: 1fr 320px;
  }
}