/* ==========================================================
   品牌档案页 / page-about 专属样式
   移动端优先，桌面端补充
   ========================================================== */

.page-about {
  --ab-ellipse-1: radial-gradient(ellipse at 78% 12%, rgba(255, 106, 0, 0.16), transparent 58%);
  --ab-ellipse-2: radial-gradient(ellipse at 18% 82%, rgba(57, 255, 20, 0.09), transparent 46%);
  --ab-milestone-gap: 24px;
  --ab-milestone-offset: 0px;
  position: relative;
  padding: 0 0 56px;
}

.page-about a:focus-visible {
  outline: 2px solid var(--c-accent-2);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 面包屑 ---------- */
.page-about__breadcrumb {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 22px 20px 0;
}

/* ---------- Hero ---------- */
.page-about__hero {
  position: relative;
  background:
    var(--ab-ellipse-1),
    var(--ab-ellipse-2),
    var(--c-panel-2);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about__hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--c-accent), var(--c-accent-2));
  z-index: 2;
}

.page-about__hero::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 30%, #000 70%, transparent 100%);
          mask-image: linear-gradient(180deg, transparent 0%, #000 30%, #000 70%, transparent 100%);
}

.page-about__hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 56px 20px 52px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about__hero-copy {
  max-width: 680px;
}

.page-about__hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent-2);
  margin-bottom: 18px;
  padding: 6px 14px;
  border: 1px solid rgba(57, 255, 20, 0.32);
  border-radius: 999px;
  background: rgba(57, 255, 20, 0.05);
}

.page-about__hero-kicker-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-accent-2);
  box-shadow: 0 0 0 4px rgba(57, 255, 20, 0.15);
}

.page-about__hero-title {
  font-family: var(--font-h);
  font-size: clamp(28px, 5.4vw, 46px);
  line-height: 1.1;
  font-weight: 900;
  color: var(--c-text);
  letter-spacing: -0.01em;
  margin-bottom: 18px;
}

.page-about__hero-title-accent {
  color: var(--c-accent);
}

.page-about__hero-lead {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-dim);
  margin-bottom: 8px;
  max-width: 600px;
}

.page-about__hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.page-about__stat {
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: var(--transition);
}

.page-about__stat:hover {
  border-color: rgba(255, 106, 0, 0.6);
  transform: translateY(-2px);
}

.page-about__stat-num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  color: var(--c-accent);
}

.page-about__stat-label {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-text-dim);
}

/* ---------- 品牌起源 ---------- */
.page-about__origin {
  background: var(--c-bg);
  position: relative;
  padding: 64px 0;
}

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

.page-about__origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 36px;
}

.page-about__origin-copy p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-text-dim);
  margin-bottom: 18px;
}

.page-about__origin-copy p:first-child {
  color: var(--c-text);
  font-size: 17px;
}

.page-about__origin-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about__origin-fact {
  position: relative;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-accent);
  border-radius: var(--radius-sm);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: var(--transition);
}

.page-about__origin-fact:hover {
  border-left-color: var(--c-accent-2);
  transform: translateX(4px);
}

.page-about__origin-fact-num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 30px;
  line-height: 1.1;
  color: var(--c-text);
}

.page-about__origin-fact-label {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--c-text-dim);
}

/* ---------- 发展里程碑 ---------- */
.page-about__milestones {
  background: var(--c-panel-2);
  position: relative;
  padding: 64px 0;
}

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

.page-about__milestone-map {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 44px;
  padding-bottom: 12px;
}

.page-about__milestone-line {
  display: none;
}

.page-about__milestone-item {
  position: relative;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 26px 24px 24px;
  transition: var(--transition);
  margin-top: 0;
}

.page-about__milestone-item:hover {
  border-color: rgba(255, 106, 0, 0.65);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.page-about__milestone-item::before {
  content: '';
  position: absolute;
  top: -18px;
  left: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 4px rgba(255, 106, 0, 0.18);
}

.page-about__milestone-phase {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-accent-2);
  margin-bottom: 14px;
}

.page-about__milestone-item h3 {
  font-family: var(--font-h);
  font-size: 18px;
  font-weight: 900;
  color: var(--c-text);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.page-about__milestone-item p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-dim);
}

.page-about__milestone-image {
  margin-top: 44px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

/* ---------- 数据处理体系 ---------- */
.page-about__data {
  background: var(--c-bg);
  padding: 64px 0;
}

.page-about__data-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 36px;
}

.page-about__data-flow {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about__flow-step {
  position: relative;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 24px 22px 22px;
  transition: var(--transition);
}

.page-about__flow-step:hover {
  border-color: rgba(57, 255, 20, 0.45);
  transform: translateY(-2px);
}

.page-about__flow-step:not(:last-child)::after {
  content: '';
  position: absolute;
  bottom: -14px;
  left: 30px;
  width: 2px;
  height: 14px;
  background: var(--c-accent-2);
}

.page-about__flow-index {
  display: inline-block;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 14px;
  color: var(--c-accent);
  margin-bottom: 10px;
}

.page-about__flow-step h3 {
  font-family: var(--font-h);
  font-size: 17px;
  font-weight: 900;
  color: var(--c-text);
  margin-bottom: 8px;
}

.page-about__flow-step p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-dim);
}

.page-about__data-visual {
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about__data-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 32px;
}

.page-about__data-stats .stat {
  background: var(--c-panel-2);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  padding: 18px 16px;
  text-align: center;
  transition: var(--transition);
}

.page-about__data-stats .stat:hover {
  border-color: rgba(255, 106, 0, 0.5);
}

/* ---------- 专家团队 ---------- */
.page-about__team {
  background: var(--c-panel-2);
  padding: 64px 0;
}

.page-about__team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 36px;
}

.page-about__team-image {
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about__team-detail {
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 30px 28px;
}

.page-about__team-intro p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-text-dim);
  margin-bottom: 24px;
}

.page-about__team-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--c-line);
}

.page-about__team-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about__team-list-label {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--c-text-dim);
}

.page-about__team-list-value {
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-text);
  text-align: right;
}

/* ---------- 资质与认证 ---------- */
.page-about__certs {
  background: var(--c-bg);
  padding: 64px 0;
}

.page-about__certs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 36px;
}

.page-about__cert-card {
  position: relative;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 32px 28px 30px;
  overflow: hidden;
  transition: var(--transition);
}

.page-about__cert-card:hover {
  border-color: rgba(255, 106, 0, 0.45);
  transform: translateY(-3px);
}

.page-about__cert-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 90px;
  height: 90px;
  background: linear-gradient(225deg, rgba(255, 106, 0, 0.18), transparent 70%);
  border-radius: 0 0 0 90px;
}

.page-about__cert-icon {
  margin-bottom: 18px;
}

.page-about__cert-card h3 {
  font-family: var(--font-h);
  font-size: 18px;
  font-weight: 900;
  color: var(--c-text);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.page-about__cert-card p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-dim);
}

/* ---------- 本地化承诺 ---------- */
.page-about__local {
  background: var(--c-panel-2);
  padding: 64px 0;
}

.page-about__local-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 36px;
}

.page-about__local-copy p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-text-dim);
  margin-bottom: 16px;
}

.page-about__local-icp {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--c-line);
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--c-text-faint);
}

.page-about__local-links {
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 30px 28px;
}

.page-about__local-links h3 {
  font-family: var(--font-h);
  font-size: 18px;
  font-weight: 900;
  color: var(--c-text);
  margin-bottom: 20px;
}

.page-about__local-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about__local-links li {
  margin: 0;
}

.page-about__local-links .btn {
  width: 100%;
  justify-content: center;
}

/* ---------- 图片通用约束 ---------- */
.page-about img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
  width: 100%;
}

.page-about .media-frame {
  background: var(--c-panel-2);
}

/* ==========================================================
   平板 ≥ 640px
   ========================================================== */
@media (min-width: 640px) {
  .page-about__hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__origin-facts {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__data-stats {
    grid-template-columns: repeat(5, 1fr);
  }

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

  .page-about__local-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }

  .page-about__data-flow {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .page-about__flow-step:not(:last-child)::after {
    display: none;
  }

  .page-about__flow-step:nth-child(even)::after {
    display: block;
    content: '';
    position: absolute;
    right: -16px;
    top: 50%;
    left: auto;
    bottom: auto;
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--c-accent-2);
    border-top: 2px solid var(--c-accent-2);
    transform: translateY(-50%) rotate(45deg);
    background: none;
    border-radius: 0;
  }
}

/* ==========================================================
   桌面 ≥ 992px
   ========================================================== */
@media (min-width: 992px) {
  .page-about {
    padding-bottom: 0;
  }

  .page-about__hero-inner {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 48px;
    padding: 84px 24px 80px;
  }

  .page-about__hero-title {
    font-size: 46px;
  }

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

  /* 品牌起源双栏 */
  .page-about__origin {
    padding: 88px 0 96px;
  }

  .page-about__origin-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 56px;
    align-items: start;
    margin-top: 48px;
  }

  .page-about__origin-facts {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: 8px;
  }

  /* 里程碑 — 对角线展开 */
  .page-about__milestones {
    padding: 88px 0 96px;
  }

  .page-about__milestone-map {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
    margin-top: 56px;
    min-height: 300px;
    padding-top: 20px;
  }

  .page-about__milestone-line {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
  }

  .page-about__milestone-item {
    flex: 1 1 0;
    min-width: 0;
    margin-top: 0;
    max-width: 232px;
    padding: 28px 22px 24px;
  }

  .page-about__milestone-item--1 { margin-top: 96px; }
  .page-about__milestone-item--2 { margin-top: 68px; }
  .page-about__milestone-item--3 { margin-top: 42px; }
  .page-about__milestone-item--4 { margin-top: 20px; }
  .page-about__milestone-item--5 { margin-top: 0; }

  .page-about__milestone-image {
    margin-top: 64px;
  }

  /* 数据处理体系 */
  .page-about__data {
    padding: 88px 0;
  }

  .page-about__data-layout {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    margin-top: 48px;
  }

  .page-about__data-flow {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__data-stats {
    margin-top: 44px;
  }

  /* 专家团队双栏 */
  .page-about__team {
    padding: 88px 0;
  }

  .page-about__team-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
    margin-top: 48px;
  }

  .page-about__team-detail {
    padding: 36px 32px;
  }

  /* 认证与本地化 */
  .page-about__certs {
    padding: 88px 0;
  }

  .page-about__certs-grid {
    gap: 24px;
    margin-top: 48px;
  }

  .page-about__local {
    padding: 88px 0;
  }

  .page-about__local-grid {
    gap: 48px;
    margin-top: 48px;
  }
}

/* ==========================================================
   大桌面 ≥ 1200px
   ========================================================== */
@media (min-width: 1200px) {
  .page-about__milestone-item {
    max-width: 240px;
  }
}