/* Màu sắc và các biến dùng chung */
:root {
  --workflow-bg: #f8fafc;
  --workflow-accent: #5dc238; 
  --workflow-text: #1e293b;
  --workflow-desc: #64748b;
  --workflow-card-bg: #ffffff;
  --workflow-transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.digital-workflow {
  padding: 100px 20px;
  background-color: var(--workflow-bg);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  overflow-x: hidden;
}

/* Khung video: ưu tiên MP4, tự chuyển sang dự phòng khi cần. */
.tech-video-showcase {
  padding: 70px 20px 0;
  background-color: var(--workflow-bg);
}

.tech-video-container {
  position: relative;
  box-sizing: border-box;
  width: 100%;
  max-width: 1200px;
  aspect-ratio: 16 / 9;
  margin: 0 auto;
  overflow: hidden;
  border-radius: 24px;
  background: #0b1511;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, .20);
}

.tech-video-container > video,
.tech-video-container > iframe,
.tech-video-container > .tech-video-unavailable {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.tech-video-container > [hidden] {
  display: none !important;
}

.tech-video-container > video {
  object-fit: cover;
}

.tech-video-unavailable {
  box-sizing: border-box;
  display: flex !important;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 16px;
  padding: 24px;
  color: #e5eee8;
  text-align: center;
  font-size: clamp(14px, 2vw, 20px);
}

.tech-video-unavailable[hidden] {
  display: none !important;
}

.tech-video-unavailable-icon {
  display: grid;
  place-items: center;
  width: 66px;
  height: 66px;
  padding-left: 3px;
  border: 1px solid rgba(255,255,255,.26);
  border-radius: 50%;
  font-size: 26px;
  color: #b8df99;
}

.tech-video-unavailable p {
  margin: 0;
}

.workflow-container {
  max-width: 1200px;
  margin: 0 auto;
}

.digital-workflow .section-title {
  text-align: center;
  font-size: 2.5rem;
  color: var(--workflow-text);
  margin-bottom: 70px;
  font-weight: 700;
}

.workflow-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* 2 cột để thẻ to ra */
  gap: 40px;
  position: relative;
}

.workflow-card {
  position: relative;
  background: var(--workflow-card-bg);
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  padding: 40px 30px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
  cursor: pointer;
  z-index: 1; 
  min-height: 280px; /* tăng chiều cao mặc định */
  justify-content: center;
  
  opacity: 0;
  transform: translateY(40px);

  transition: opacity 0.6s ease-out var(--delay, 0s), 
              transform 0.6s ease-out var(--delay, 0s), 
              box-shadow 0.4s ease, 
              border-color 0.4s ease;
}

.workflow-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.workflow-card:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: var(--workflow-accent);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

.card-bg-image {
  position: absolute;
  inset: 0;
  border-radius: 15px;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transform: scale(1.1); /* bắt đầu hơi to */
  transition: opacity 0.6s ease, transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: -2;
}

.card-overlay {
  position: absolute;
  inset: 0;
  border-radius: 15px;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.85) 0%, rgba(0, 0, 0, 0.4) 100%);
  opacity: 0;
  transition: opacity 0.6s ease;
  z-index: -1;
}

.workflow-card:hover .card-bg-image {
  opacity: 1;
  transform: scale(1); /* zoom lại về bình thường khi hover tạo chiều sâu */
}

.workflow-card:hover .card-overlay {
  opacity: 1;
}

.card-content {
  position: relative;
  z-index: 1;
}

.digital-workflow .step-number {
  position: absolute;
  top: -20px;
  right: -5px;
  font-size: 6rem;
  font-weight: 900;
  line-height: 1;
  color: #f1f5f9;
  z-index: -1;
  transition: var(--workflow-transition);
}

.workflow-card:hover .step-number {
  color: rgba(255, 255, 255, 0.12); 
}

.digital-workflow .card-title {
  font-size: 1.5rem;
  color: var(--workflow-text);
  margin: 0 0 15px 0;
  font-weight: 700;
  transition: var(--workflow-transition);
}

.digital-workflow .card-desc {
  font-size: 1rem;
  color: var(--workflow-desc);
  line-height: 1.6;
  margin: 0;
  transition: var(--workflow-transition);
}

.workflow-card:hover .card-title {
  color: var(--workflow-accent);
}

.workflow-card:hover .card-desc {
  color: #ffffff;
}

@media (min-width: 1024px) {
  .workflow-card:not(:nth-child(2n))::after {
    content: '';
    position: absolute;
    top: 50%;
    right: -40px;
    width: 40px;
    height: 2px;
    background-image: linear-gradient(to right, #cbd5e1 50%, transparent 50%);
    background-size: 8px 2px;
    transform: translateY(-50%);
    z-index: -1;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .workflow-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .workflow-card:not(:nth-child(2n))::after {
    content: '';
    position: absolute;
    top: 50%;
    right: -40px;
    width: 40px;
    height: 2px;
    background-image: linear-gradient(to right, #cbd5e1 50%, transparent 50%);
    background-size: 8px 2px;
    transform: translateY(-50%);
    z-index: -1;
  }
}

@media (max-width: 767px) {
  .workflow-grid {
    grid-template-columns: 1fr;
  }
  .workflow-card:not(:last-child)::after {
    content: '';
    position: absolute;
    bottom: -40px; 
    left: 50%;
    width: 2px;
    height: 40px;
    background-image: linear-gradient(to bottom, #cbd5e1 50%, transparent 50%);
    background-size: 2px 8px;
    transform: translateX(-50%);
    z-index: -1;
  }
}


/* Video responsive (áp dụng sau các media query gốc) */
@media (max-width: 767px) {
  .tech-video-showcase {
    padding: 36px 16px 0;
  }

  .tech-video-container {
    border-radius: 16px;
  }

}

/* Tránh chuyển động mạnh với người bật Reduce Motion */
@media (prefers-reduced-motion: reduce) {
  .workflow-card,
  .card-bg-image,
  .card-overlay {
    transition-duration: 0.01ms !important;
  }
}