/* ================================================================
   关于我们页 - 100% 还原 Figma node 117:590
   页面顺序（按 y 坐标）：
     Hero 背景渐变 (y:0~980) + logo(y:210) + 介绍(y:467) + 时间线(y:719) + 核心优势标题(y:1074)
     核心优势 4 卡片 (y:1273)
     业务模块标题 (y:1728) + 6 服务卡片 (y:1864)
     联系我们 (y:2404)
     Footer (y:2716)
   ================================================================ */

/* ========== About Hero ========== */
.about-hero {
  background: linear-gradient(180deg, #D6E8FF 0%, #FCFCFC 100%);
  padding-top: 64px;
}
.about-hero-inner {
  max-width: 1380px; margin: 0 auto; padding: 0 20px;
  display: flex; flex-direction: column; align-items: center;
}
.about-hero-logo {
  width: 273.38px; height: auto; margin-top: 146px;
}
.about-intro {
  max-width: 827px; margin-top: 81px;
  font-size: 14px; font-weight: 400; line-height: 22px;
  color: rgba(0,0,0,0.6); text-align: center;
}

/* ========== 发展时间线 ========== */
.timeline {
  position: relative; margin-top: 120px; margin-bottom: 120px;
  width: 100%; max-width: 1320px;
  display: flex; justify-content: space-between; align-items: flex-start;
}
.timeline-line {
  position: absolute; top: 52px; left: 0; right: 0; height: 1px;
  background: rgba(28,111,255,0.2);
}
.timeline-item {
  position: relative; width: 180px;
  display: flex; flex-direction: column; align-items: center;
  text-align: center; gap: 27px;
}
.timeline-mark {
  display: flex; flex-direction: column; align-items: center; gap: 17px;
}
.timeline-year {
  font-size: 24px; font-weight: 500; line-height: 32px; color: #000;
}
.timeline-year.is-active { color: var(--blue); }
.timeline-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--blue); border: 1px solid #FFF;
  position: relative; z-index: 1;
}
.timeline-title {
  font-size: 16px; font-weight: 400; line-height: 16px; color: #000;
  margin-top: -10px;
}
.timeline-title.is-active { color: var(--blue); }
.timeline-desc {
  width: 180px; font-size: 14px; font-weight: 400; line-height: 22px;
  color: rgba(0,0,0,0.6); margin-top: -10px;
}

/* ========== 核心优势 ========== */
.advantage-section { background: #FDFDFD; padding: 80px 0; }
.advantage-inner { max-width: 1380px; margin: 0 auto; padding: 0 20px; }
.advantage-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 9px;
}
.adv-card {
  position: relative; overflow: hidden;
  background: transparent;
  border-radius: 16px; padding: 32px;
  display: flex; flex-direction: column; gap: 102px;
}
/* 仅底色做透明度变化：默认 0.4，悬停 1 */
.adv-card::before {
  content: ''; position: absolute; inset: 0; z-index: 0;
  background: linear-gradient(180deg, #CEE4FF 0%, #F7FBFF 100%);
  opacity: 0.4; transition: opacity .3s ease;
}
.adv-card:hover::before { opacity: 1; }
.adv-icon {
  width: 42px; height: 42px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  position: relative; z-index: 1;
}
.adv-text {
  display: flex; flex-direction: column; gap: 16px;
  position: relative; z-index: 1;
}
.adv-title { font-size: 24px; font-weight: 500; line-height: 28px; color: #000; }
.adv-desc { font-size: 14px; font-weight: 400; line-height: 22px; color: rgba(0,0,0,0.6); }

/* ========== 业务模块 ========== */
.biz-section { background: #FDFDFD; padding: 80px 0; }
.biz-inner { max-width: 1380px; margin: 0 auto; padding: 0 20px; }
.biz-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.biz-card {
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 16px; padding: 24px; min-height: 210px;
  display: flex; flex-direction: column; justify-content: space-between; gap: 24px;
  transition: border-color .3s ease,
              opacity .7s cubic-bezier(0.22,1,0.36,1),
              transform .7s cubic-bezier(0.22,1,0.36,1);
}
.biz-card:hover { border-color: var(--blue); transition-delay: 0s; }
.biz-card-title { font-size: 24px; font-weight: 500; line-height: 28px; color: #000; }
.biz-tags { display: flex; flex-wrap: wrap; gap: 12px; }
.biz-tag {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 8px 24px; background: #EEF5FD; border-radius: 8px;
  font-size: 14px; font-weight: 400; line-height: 14px; color: rgba(0,0,0,0.6);
}

/* ========== 联系我们 ========== */
.contact-section { background: #FDFDFD; padding: 60px 0 100px; }
.contact-inner {
  max-width: 1381px; margin: 0 auto; padding: 0 20px;
  display: flex; flex-direction: column; gap: 32px;
}
.contact-heading { font-size: 24px; font-weight: 500; line-height: 28px; color: #000; }
.contact-divider { width: 100%; height: 1px; background: rgba(0,0,0,0.1); }
.contact-offices { display: flex; gap: 0; }
.contact-office { flex: 1; display: flex; flex-direction: column; gap: 16px; }
.contact-office-title { font-size: 20px; font-weight: 500; line-height: 20px; color: #000; }
.contact-office-addr { font-size: 14px; font-weight: 400; line-height: 14px; color: rgba(0,0,0,0.6); }
.contact-emails { display: flex; gap: 0; }
.contact-email-item { flex: 1; display: flex; flex-direction: column; gap: 16px; }
.contact-email-label { font-size: 16px; font-weight: 500; line-height: 16px; color: #000; }
.contact-email-value { font-size: 14px; font-weight: 400; line-height: 14px; color: rgba(0,0,0,0.6); transition: color .2s; }
.contact-email-value:hover { color: var(--blue); }

/* ========== 响应式 — 统一断点 1440 / 1200 / 1024 / 768 / 640 ========== */
@media (max-width: 1440px) {
  .advantage-grid { gap: 12px; }
}
@media (max-width: 1200px) {
  .biz-grid       { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-card       { gap: 80px; }
  .timeline       { flex-wrap: wrap; gap: 48px; justify-content: center; }
  .timeline-line  { display: none; }
}
@media (max-width: 1024px) {
  .advantage-grid { gap: 16px; }
  .adv-card       { gap: 64px; }
}
@media (max-width: 768px) {
  .biz-grid, .advantage-grid { grid-template-columns: 1fr; }
  .adv-card        { gap: 48px; }
  .contact-offices, .contact-emails { flex-direction: column; gap: 32px; }
  .about-hero-logo { margin-top: 100px; width: 220px; }
  .about-intro     { margin-top: 48px; }
  .timeline        { margin-top: 64px; margin-bottom: 64px; gap: 32px; }
}
@media (max-width: 640px) {
  .about-hero-logo { margin-top: 80px; width: 180px; }
  .adv-card, .biz-card { padding: 24px; }
  .adv-card        { gap: 40px; }
  .timeline-item   { width: 100%; }
  .timeline-desc   { width: 100%; }
}

/* ================================================================
   暗色模式覆盖（关于我们页）
   ================================================================ */
:root[data-theme="dark"] .about-hero {
  background: linear-gradient(180deg, #0F0F0F 0%, #000 100%);
}
:root[data-theme="dark"] .about-hero-logo { filter: none; }
:root[data-theme="dark"] .about-intro { color: rgba(255,255,255,0.6); }

/* 时间线 */
:root[data-theme="dark"] .timeline-line { background: rgba(28,111,255,0.3); }
:root[data-theme="dark"] .timeline-year,
:root[data-theme="dark"] .timeline-title { color: #fff; }
:root[data-theme="dark"] .timeline-year.is-active,
:root[data-theme="dark"] .timeline-title.is-active { color: var(--blue); }
:root[data-theme="dark"] .timeline-desc { color: rgba(255,255,255,0.6); }

/* 核心优势区 */
:root[data-theme="dark"] .advantage-section { background: #000; }
:root[data-theme="dark"] .adv-card::before { background: #181818; opacity: 1; }
:root[data-theme="dark"] .adv-card:hover::before { background: #2C2C2C; opacity: 1; }
:root[data-theme="dark"] .adv-title { color: #fff; }
:root[data-theme="dark"] .adv-desc { color: rgba(255,255,255,0.6); }

/* 业务模块区：默认浅描边，悬停蓝 */
:root[data-theme="dark"] .biz-section { background: #000; }
:root[data-theme="dark"] .biz-card { border-color: rgba(255,255,255,0.2); }
:root[data-theme="dark"] .biz-card:hover { border-color: var(--blue); }
:root[data-theme="dark"] .biz-card-title { color: #fff; }
:root[data-theme="dark"] .biz-tag { background: #262626; color: rgba(255,255,255,0.6); }

/* 联系我们区 */
:root[data-theme="dark"] .contact-section { background: #000; }
:root[data-theme="dark"] .contact-heading { color: #fff; }
:root[data-theme="dark"] .contact-divider { background: rgba(255,255,255,0.1); }
:root[data-theme="dark"] .contact-office-title,
:root[data-theme="dark"] .contact-email-label { color: #fff; }
:root[data-theme="dark"] .contact-office-addr,
:root[data-theme="dark"] .contact-email-value { color: rgba(255,255,255,0.6); }
:root[data-theme="dark"] .contact-email-value:hover { color: var(--blue); }