/* ================= 关于我们 about.html 专用样式 ================= */

/*---------- 首屏轮播文字增强：底部渐变压暗，保证文字可读 ----------*/
#hero .swiper-item::after {
  content: "";
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  background: linear-gradient(to top, rgba(0,0,0,.5), transparent 62%);
  pointer-events: none;
}
#hero .swiper-text { z-index: 2; }
#hero .swiper-text h1 { color: #fff; text-shadow: 0 2px 12px rgba(0,0,0,.35); }
#hero .swiper-text p { color: rgba(255,255,255,.92); text-shadow: 0 1px 8px rgba(0,0,0,.3); }

/*---------- 抽屉菜单第8个导航项补充分段动画 ----------*/
.drawer.open .nav-list a:nth-child(8) {
  transition-delay: 0.66s;
  opacity: 1;
  transform: translateX(0);
  padding-left: 20px;
}

/*---------- 通用分区 ----------*/
.section { padding: 96px 0; }
.about-container {
  width: 85%;
  max-width: 1200px;
  margin: 0 auto;
}
@media (max-width:767px) { .about-container { width: 90%; } }
.section-head { margin-bottom: 48px; }
.section-head h2 { font-size: 32px; margin-bottom: 12px; }
@media (min-width:768px) { .section-head h2 { font-size: 40px; } }
.section-head p { color: var(--muted-foreground); }

/*---------- 公司介绍 ----------*/
.about-intro {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: start;
}
@media (max-width:900px) { .about-intro { grid-template-columns: 1fr; gap: 40px; } }
.intro-text .lead {
  font-size: 18px;
  color: #111;
  line-height: 1.8;
  margin-bottom: 20px;
}
.intro-text p {
  font-size: 15px;
  line-height: 1.9;
  color: #444;
  margin-bottom: 18px;
}
.intro-tags {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.intro-tags span {
  font-size: 13px;
  color: var(--muted-foreground);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 16px;
  background: var(--card);
}
/* 数据卡片 → 视频卡片（悬浮播放） */
.stats-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 16px;
  aspect-ratio: 4 / 3;
  background: #000;
}
.stats-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 4px;
  background: linear-gradient(90deg, #333, #999);
  z-index: 2;
}
.stats-video {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.stats-overlay {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: linear-gradient(to top, rgba(0,0,0,.55), rgba(0,0,0,.12));
  color: #fff;
  transition: opacity .35s ease;
  z-index: 1;
  cursor: pointer;
}
.stats-play-icon {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.55);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  padding-left: 5px;
  transition: transform .3s ease;
}
.stats-card:hover .stats-play-icon { transform: scale(1.08); }
.stats-hint {
  font-size: 14px;
  letter-spacing: 1px;
  color: rgba(255,255,255,.94);
}
.stats-card.playing .stats-overlay { opacity: 0; pointer-events: none; }

/*---------- 核心优势 ----------*/
.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 64px;
}
@media (min-width:768px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width:1024px) { .feature-grid { grid-template-columns: repeat(4, 1fr); } }
.feature-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
  min-height: 250px;
  cursor: pointer;
  transition: transform .5s cubic-bezier(.22,1,.36,1), box-shadow .5s cubic-bezier(.22,1,.36,1), opacity .4s ease, border-color var(--transition-base);
}
.feature-card:hover { border-color: #c9c9c9; }
.feature-content {
  position: relative;
  height: 100%;
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
}
.feature-icon {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: var(--card);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.feature-icon svg { width: 24px; height: 24px; stroke: #333; }
.feature-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--muted-foreground); line-height: 1.75; }

/*---------- 荣誉资质（无限循环自动轮播） ----------*/
.honors-section { background: #f7f7f7; }
.honor-note {
  font-size: 14px;
  color: var(--muted-foreground);
  margin: -24px 0 32px;
  line-height: 1.8;
}
.cert-carousel {
  position: relative;
  overflow: hidden;
  padding: 18px 0;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 4%, #000 96%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 4%, #000 96%, transparent);
}
.cert-track {
  display: flex;
  width: max-content;
  animation: certScroll 90s linear infinite;
  will-change: transform;
}
.cert-carousel.paused .cert-track { animation-play-state: paused; }
@keyframes certScroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
.cert-carousel .cert-card {
  margin: 0 18px 0 0;
  width: 250px;
  flex: none;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  cursor: zoom-in;
  transition: transform var(--transition-long), box-shadow var(--transition-long), border-color var(--transition-base);
}
.cert-carousel .cert-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0,0,0,.08);
  border-color: #c9c9c9;
}
@media (max-width:767px) {
  .cert-carousel .cert-card { width: 180px; }
}
.cert-media {
  aspect-ratio: 4 / 3;
  background: linear-gradient(160deg, #fafafa, #eff1f3);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px;
}
/* 旧内核（Chromium <88）不支持 aspect-ratio：容器由内容撑起，加最小高度兜底 */
@supports not (aspect-ratio: 4 / 3) {
  .cert-media { min-height: 280px; }
}
.cert-media img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 3px 14px rgba(0,0,0,.12);
  transition: transform .5s ease;
}
.cert-card:hover .cert-media img { transform: scale(1.04); }
.cert-card figcaption {
  padding: 12px 14px 14px;
  font-size: 13px;
  color: var(--muted-foreground);
  line-height: 1.55;
  text-align: center;
  border-top: 1px solid var(--border);
  background: #fff;
}
.cert-card:hover figcaption { color: var(--foreground); }

/*---------- 证书灯箱 ----------*/
.lightbox {
  position: fixed;
  top: 0; right: 0; bottom: 0; left: 0;
  z-index: 300;
  background: rgba(0,0,0,.84);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 60px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lb-body {
  margin: 0;
  max-width: 92vw; /* 旧内核不支持 min() 时的兜底 */
  max-width: min(1100px, 92vw);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}
.lb-body img {
  max-width: 100%;
  max-height: 78vh;
  object-fit: contain;
  box-shadow: 0 24px 70px rgba(0,0,0,.55);
  border-radius: 6px;
  background: #fff;
  transform: scale(.92);
  opacity: 0;
  transition: transform .5s cubic-bezier(.22,1,.36,1), opacity .35s ease;
}
.lightbox.open .lb-body img {
  transform: scale(1);
  opacity: 1;
}
.lb-body figcaption {
  color: rgba(255,255,255,.94);
  font-size: 15px;
  letter-spacing: 1px;
  text-align: center;
  padding: 12px 20px;
  background: rgba(255,255,255,.08);
  border-radius: 8px;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}
.lb-close {
  position: absolute;
  top: 22px;
  right: 30px;
  background: none;
  border: none;
  color: #fff;
  font-size: 32px;
  line-height: 1;
  cursor: pointer;
  opacity: .85;
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.lb-close:hover { opacity: 1; transform: rotate(90deg); }
.lb-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.35);
  background: rgba(255,255,255,.06);
  color: #fff;
  font-size: 30px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-base), border-color var(--transition-base);
}
.lb-nav:hover { background: rgba(255,255,255,.16); border-color: rgba(255,255,255,.6); }
.lb-prev { left: 26px; }
.lb-next { right: 26px; }
@media (max-width:767px) {
  .lightbox { padding: 40px 16px; }
  .lb-nav { width: 42px; height: 42px; font-size: 24px; }
  .lb-prev { left: 8px; }
  .lb-next { right: 8px; }
}

/*---------- 合作客户 ----------*/
.client-note {
  font-size: 14px;
  color: var(--muted-foreground);
  line-height: 1.8;
  max-width: 720px;
  margin-bottom: 8px;
}
.client-group-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--foreground);
  margin: 44px 0 20px;
}
.client-group-title::before {
  content: "";
  width: 6px; height: 18px;
  border-radius: 3px;
  background: var(--primary);
}
.client-logo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (min-width:768px) { .client-logo-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width:1024px) { .client-logo-grid { grid-template-columns: repeat(4, 1fr); } }
.client-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  min-height: 132px;
  padding: 26px 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: transform var(--transition-long), box-shadow var(--transition-long), border-color var(--transition-base);
}
.client-logo:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 26px rgba(0,0,0,.07);
  border-color: #c9c9c9;
}
.logo-en {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 1.5px;
  line-height: 1.2;
}
.logo-cn {
  font-size: 14px;
  color: var(--muted-foreground);
  line-height: 1.5;
  transition: color var(--transition-base);
}
.client-logo:hover .logo-cn { color: var(--foreground); }
.logo-role {
  font-size: 11px;
  letter-spacing: 1px;
  color: #aaa;
  margin-top: 2px;
}

/*---------- 合作客户：类别切换 ----------*/
.client-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 8px;
}
.client-tab {
  padding: 9px 22px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  color: var(--muted-foreground);
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition-base);
}
.client-tab:hover { border-color: var(--primary); color: var(--foreground); }
.client-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.client-group { transition: opacity .3s ease; }
.client-group.hidden { display: none; }
.client-logo {
  cursor: pointer;
  position: relative;
}
.client-logo::after {
  content: "▶ 播放案例";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(.9);
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(0,0,0,.62);
  color: #fff;
  font-size: 13px;
  letter-spacing: 1px;
  opacity: 0;
  transition: opacity .3s ease, transform .3s ease;
  pointer-events: none;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
.client-logo:hover::after {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

/*---------- 合作客户视频弹窗 ----------*/
.client-video-modal {
  position: fixed;
  top: 0; right: 0; bottom: 0; left: 0;
  z-index: 400;
  background: rgba(0,0,0,.86);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}
.client-video-modal.open { opacity: 1; pointer-events: auto; }
.cvm-body {
  max-width: 1000px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.cvm-body video {
  width: 100%;
  max-height: 76vh;
  background: #000;
  border-radius: 8px;
  box-shadow: 0 24px 70px rgba(0,0,0,.55);
  outline: none;
}
.cvm-caption {
  color: rgba(255,255,255,.94);
  font-size: 16px;
  letter-spacing: 1px;
  text-align: center;
}
.cvm-close {
  position: absolute;
  top: 22px;
  right: 30px;
  background: none;
  border: none;
  color: #fff;
  font-size: 32px;
  line-height: 1;
  cursor: pointer;
  opacity: .85;
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.cvm-close:hover { opacity: 1; transform: rotate(90deg); }
@media (max-width:767px) {
  .cvm-close { top: 16px; right: 18px; }
  .client-video-modal { padding: 60px 16px 32px; }
}

/*---------- 核心优势：悬浮弹出视频层 ----------*/
.feature-pop {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  z-index: 5;
  background: #000;
  border-radius: 14px;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: scale(.84);
  box-shadow: 0 18px 48px rgba(0,0,0,.32);
  transition: opacity .35s ease, transform .45s cubic-bezier(.22,1,.36,1), visibility 0s linear .45s;
}
.feature-card:hover .feature-pop {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
  transition: opacity .3s ease, transform .4s cubic-bezier(.22,1,.36,1), visibility 0s;
}
.feature-pop-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.feature-pop-label {
  position: absolute;
  left: 16px;
  bottom: 14px;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 1px;
  text-shadow: 0 1px 8px rgba(0,0,0,.7);
}

/*---------- 结尾横幅 ----------*/
.closing {
  background: #0a0a0a;
  color: #fff;
  text-align: center;
  padding: 92px 24px;
}
.closing h2 {
  font-size: clamp(24px, 4vw, 34px);
  letter-spacing: 3px;
  font-weight: 600;
}
.closing p {
  margin-top: 16px;
  color: rgba(255,255,255,.6);
  font-size: 15px;
  letter-spacing: 2px;
}
.closing .closing-phone {
  display: inline-block;
  margin-top: 32px;
  padding: 14px 44px;
  border: 1px solid rgba(255,255,255,.4);
  border-radius: 6px;
  color: #fff;
  text-decoration: none;
  font-size: 15px;
  letter-spacing: 1px;
  transition: background var(--transition-base), color var(--transition-base);
}
.closing .closing-phone:hover { background: #fff; color: #000; }