/* ============================================
   关于我们页面专用样式
   ============================================ */

/* 品牌介绍 */
.brand-intro {
  padding: var(--spacing-xxl) 0;
  background: var(--white);
}

.intro-content {
  max-width: 900px;
  margin: 0 auto;
}

.intro-text p {
  font-size: var(--font-lg);
  line-height: 2;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-lg);
  text-align: justify;
  text-indent: 2em;
}

/* 品牌视频 */
.brand-video-section {
  padding: var(--spacing-xxl) 0;
  background: var(--light-gray);
}

.brand-video-section .container {
  max-width: 1200px;
}

.brand-video-container {
  position: relative;
  width: 100%;
  margin: 0 auto;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: #000;
}

.brand-video-container::before {
  content: '';
  display: block;
  padding-top: 56.25%; /* 16:9 比例 */
}

.brand-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: rgba(0, 0, 0, 0.3);
}

/* 视频封面 */
.video-poster {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  cursor: pointer;
  transition: opacity var(--transition-normal);
}

.video-poster.hidden {
  opacity: 0;
  pointer-events: none;
}

.video-poster img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.video-poster .play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100px;
  height: 100px;
  background: rgba(0, 0, 0, 0.6);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
}

.video-poster:hover .play-button {
  background: rgba(0, 0, 0, 0.8);
  transform: translate(-50%, -50%) scale(1.1);
}

.video-poster .play-button svg {
  margin-left: 4px;
}

/* 视频控制器 */
.video-controls {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  opacity: 1;
  transition: opacity var(--transition-normal);
}

.video-controls.hide-cursor {
  cursor: none;
}

.video-controls.fade-out .video-control-bar {
  opacity: 0;
}

/* 大播放按钮 */
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  background: rgba(0, 0, 0, 0.7);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  z-index: 2;
}

.video-play-btn:hover {
  background: rgba(0, 0, 0, 0.85);
  transform: translate(-50%, -50%) scale(1.1);
}

.video-play-btn.hidden {
  opacity: 0;
  pointer-events: none;
}

/* 底部控制栏 */
.video-control-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  padding: 40px 20px 15px;
  transition: opacity var(--transition-normal);
  z-index: 3;
}

/* 进度条 */
.progress-bar {
  position: relative;
  height: 5px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 3px;
  cursor: pointer;
  margin-bottom: 12px;
  transition: height var(--transition-fast);
}

.progress-bar:hover {
  height: 7px;
}

.progress-filled {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: var(--primary-purple-blue);
  border-radius: 3px;
  width: 0%;
  transition: width 0.1s linear;
}

.progress-handle {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  background: white;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  opacity: 0;
  transition: opacity var(--transition-fast);
  left: 0%;
}

.progress-bar:hover .progress-handle {
  opacity: 1;
}

/* 控制按钮组 */
.control-buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.control-left,
.control-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.control-btn {
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  border-radius: 4px;
}

.control-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
}

.control-btn svg {
  display: block;
}

.control-btn .hidden {
  display: none;
}

/* 时间显示 */
.time-display {
  color: white;
  font-size: 14px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  user-select: none;
}

/* 音量控制 */
.volume-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.volume-slider {
  width: 0;
  overflow: hidden;
  transition: width var(--transition-normal);
}

.volume-control:hover .volume-slider {
  width: 60px;
}

.volume-bar {
  position: relative;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 2px;
  cursor: pointer;
}

.volume-filled {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: white;
  border-radius: 2px;
  width: 100%;
  transition: width var(--transition-fast);
}

/* 隐藏类 */
.hidden {
  display: none !important;
}

/* 成绩展示 */
.achievements-section {
  padding: var(--spacing-xxl) 0;
  background: var(--white);
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.achievement-card {
  background: var(--light-gray);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.achievement-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.achievement-card:hover::before {
  transform: scaleX(1);
}

.achievement-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  background: var(--white);
}

.achievement-icon {
  color: var(--primary-purple-blue);
  margin-bottom: var(--spacing-md);
  display: flex;
  justify-content: center;
  transition: transform var(--transition-normal);
}

.achievement-card:hover .achievement-icon {
  transform: scale(1.1);
}

.achievement-content {
  position: relative;
}

.achievement-number-wrapper {
  display: flex;
  align-items: baseline;
  justify-content: center;
  margin-bottom: var(--spacing-sm);
}

.achievement-number {
  font-size: 56px;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.achievement-suffix {
  font-size: var(--font-xxl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-left: 4px;
}

.achievement-label {
  font-size: var(--font-xl);
  font-weight: 600;
  color: var(--black);
  margin-bottom: var(--spacing-xs);
}

.achievement-desc {
  font-size: var(--font-sm);
  color: var(--gray);
}

/* 核心价值观 */
.values-section {
  padding: var(--spacing-xxl) 0 var(--spacing-xl);
  background: var(--light-gray);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.value-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.value-icon {
  font-size: 64px;
  margin-bottom: var(--spacing-md);
}

.value-title {
  font-size: var(--font-xl);
  font-weight: 600;
  color: var(--primary-purple-blue);
  margin-bottom: var(--spacing-sm);
}

.value-desc {
  font-size: var(--font-md);
  color: var(--dark-gray);
  line-height: 1.6;
}

/* 响应式设计 - 平板 */
@media (max-width: 1024px) {
  .intro-text p {
    font-size: var(--font-md);
  }

  .achievements-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .achievement-number {
    font-size: 48px;
  }
}

/* 响应式设计 - 手机 */
@media (max-width: 768px) {
  .brand-intro {
    padding: var(--spacing-lg) 0;
  }

  .intro-text p {
    font-size: var(--font-sm);
    line-height: 1.8;
  }

  .brand-video-section {
    padding: var(--spacing-lg) 0;
  }

  .play-button {
    width: 80px;
    height: 80px;
  }

  .play-button svg {
    width: 48px;
    height: 48px;
  }

  .video-hint {
    font-size: var(--font-md);
  }

  .achievements-section {
    padding: var(--spacing-lg) 0;
  }

  .achievements-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .achievement-card {
    padding: var(--spacing-lg);
  }

  .achievement-number {
    font-size: 40px;
  }

  .achievement-suffix {
    font-size: var(--font-xl);
  }

  .achievement-label {
    font-size: var(--font-lg);
  }

  .values-section {
    padding: var(--spacing-lg) 0;
  }

  .values-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .value-card {
    padding: var(--spacing-lg);
  }

  .value-icon {
    font-size: 48px;
  }

  .value-title {
    font-size: var(--font-lg);
  }

  .value-desc {
    font-size: var(--font-sm);
  }
}