/**
 * Partners Section - Optimized CSS
 * Modular, maintainable, and scalable styles
 */

/* ===== PARTNERS SECTION BASE ===== */
.partners-section {
  --partners-gap: 24px;
  --partners-card-width: 320px;
  --partners-card-padding: 24px;
  --partners-logo-size: 100px;
  --partners-blur-width: 20px;
  --partners-animation-duration: 30s;
  
  /* Responsive variables */
  --partners-mobile-gap: 12px;
  --partners-mobile-card-width: 240px;
  --partners-mobile-logo-size: 80px;
  --partners-mobile-blur-width: 12px;
  
  --partners-tablet-gap: 18px;
  --partners-tablet-card-width: 300px;
  --partners-tablet-logo-size: 90px;
  --partners-tablet-blur-width: 15px;
  
  --partners-desktop-gap: 24px;
  --partners-desktop-card-width: 320px;
  --partners-desktop-logo-size: 100px;
  --partners-desktop-blur-width: 20px;
}

/* ===== PARTNERS CONTAINER ===== */
.partners-container {
  position: relative;
  margin-top: 32px;
  overflow: hidden;
  width: 100%;
  contain: layout style paint;
  isolation: isolate;
}

/* ===== PARTNERS CAROUSEL ===== */
.partners-carousel {
  margin-top: 32px;
  padding: 16px 0;
  overflow: hidden;
  width: 100%;
  position: relative;
  contain: layout style paint;
  isolation: isolate;
}

.partners-track {
  display: flex;
  animation: infiniteScroll var(--partners-animation-duration) linear infinite;
  width: max-content;
  gap: var(--partners-gap);
  will-change: transform;
}

.partners-carousel:hover .partners-track {
  animation-play-state: paused;
}

/* ===== PARTNER CARDS ===== */
.partner-card {
  flex: 0 0 auto;
  width: var(--partners-card-width);
  min-width: var(--partners-card-width);
  background: rgba(255, 255, 255, 0.9);
  border-radius: 12px;
  padding: var(--partners-card-padding);
  text-align: center;
  box-shadow: 0 4px 12px rgba(4, 53, 79, 0.1);
  transition: all 0.3s ease;
  border: 1px solid rgba(255, 255, 255, 0.2);
  margin: 0 12px;
  will-change: transform;
  backface-visibility: hidden;
  transform: translateZ(0);
}

.partner-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(4, 53, 79, 0.15);
  border: 2px solid var(--brand-secondary);
  outline: none;
}

.partner-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.partner-logo {
  width: var(--partners-logo-size);
  height: var(--partners-logo-size);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 8px;
  padding: 8px;
  margin-top: -5px;
}

.partner-logo-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  width: auto;
  height: auto;
}

.partner-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-800);
  margin: 0;
  max-width: 100%;
  height: auto;
  min-height: 50px;
  max-height: 80px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 4px;
  box-sizing: border-box;
}

/* ===== BLUR EFFECTS ===== */
.partners-carousel::before,
.partners-carousel::after {
  content: '';
  position: absolute;
  top: 16px;
  bottom: 16px;
  width: var(--partners-blur-width);
  z-index: 10;
  pointer-events: none;
  backdrop-filter: blur(3px);
}

.partners-carousel::before {
  left: 0;
  background: linear-gradient(to right, 
    rgba(255, 255, 255, 0.95), 
    rgba(255, 255, 255, 0.7), 
    rgba(255, 255, 255, 0.3), 
    transparent
  );
}

.partners-carousel::after {
  right: 0;
  background: linear-gradient(to left, 
    rgba(255, 255, 255, 0.95), 
    rgba(255, 255, 255, 0.7), 
    rgba(255, 255, 255, 0.3), 
    transparent
  );
}

/* ===== ANIMATION ===== */
@keyframes infiniteScroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* ===== LANGUAGE SWITCHING ===== */
.partners-carousel[data-lang="vi"] {
  display: block;
}

.partners-carousel[data-lang="en"] {
  display: none;
}

.partners-carousel[data-lang="vi"].hidden {
  display: none !important;
}

.partners-carousel[data-lang="en"].visible {
  display: block !important;
}

/* ===== RESPONSIVE DESIGN ===== */

/* Mobile First - Small screens (320px - 479px) */
@media (max-width: 479px) {
  .partners-section {
    --partners-gap: var(--partners-mobile-gap);
    --partners-card-width: var(--partners-mobile-card-width);
    --partners-logo-size: var(--partners-mobile-logo-size);
    --partners-blur-width: var(--partners-mobile-blur-width);
    --partners-animation-duration: 25s;
  }
  
  .partners-carousel {
    margin-top: 24px;
    padding: 12px 0;
    touch-action: pan-x;
  }
  
  .partners-carousel::before,
  .partners-carousel::after {
    top: 12px;
    bottom: 12px;
    width: var(--partners-mobile-blur-width);
  }
  
  .partner-card {
    padding: 16px;
  }
  
  .partner-card h3 {
    font-size: 16px;
    min-height: 40px;
    max-height: 60px;
  }
}

/* Mobile - Medium screens (480px - 767px) */
@media (min-width: 480px) and (max-width: 767px) {
  .partners-section {
    --partners-gap: 14px;
    --partners-card-width: 260px;
    --partners-logo-size: 90px;
    --partners-blur-width: 16px;
    --partners-animation-duration: 28s;
  }
  
  .partners-carousel {
    margin-top: 28px;
    padding: 14px 0;
  }
  
  .partners-carousel::before,
  .partners-carousel::after {
    top: 14px;
    bottom: 14px;
    width: 16px;
  }
  
  .partner-card {
    padding: 18px;
  }
  
  .partner-card h3 {
    font-size: 17px;
    min-height: 45px;
    max-height: 65px;
  }
}

/* Tablet (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
  .partners-section {
    --partners-gap: var(--partners-tablet-gap);
    --partners-card-width: var(--partners-tablet-card-width);
    --partners-logo-size: var(--partners-tablet-logo-size);
    --partners-blur-width: var(--partners-tablet-blur-width);
    --partners-animation-duration: 30s;
  }
  
  .partners-carousel {
    margin-top: 30px;
    padding: 15px 0;
  }
  
  .partners-carousel::before,
  .partners-carousel::after {
    top: 15px;
    bottom: 15px;
    width: 18px;
  }
  
  .partner-card {
    padding: 22px;
  }
  
  .partner-card h3 {
    font-size: 18px;
    min-height: 50px;
    max-height: 70px;
  }
}

/* Desktop (1024px - 1439px) */
@media (min-width: 1024px) and (max-width: 1439px) {
  .partners-section {
    --partners-gap: var(--partners-desktop-gap);
    --partners-card-width: var(--partners-desktop-card-width);
    --partners-logo-size: var(--partners-desktop-logo-size);
    --partners-blur-width: var(--partners-desktop-blur-width);
    --partners-animation-duration: 35s;
  }
  
  .partners-carousel {
    margin-top: 32px;
    padding: 16px 0;
  }
  
  .partners-carousel::before,
  .partners-carousel::after {
    top: 16px;
    bottom: 16px;
    width: 20px;
  }
  
  .partner-card {
    padding: 24px;
  }
  
  .partner-card h3 {
    font-size: 18px;
    min-height: 50px;
    max-height: 80px;
  }
}

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
  .partners-section {
    --partners-gap: 26px;
    --partners-card-width: 340px;
    --partners-logo-size: 110px;
    --partners-blur-width: 24px;
    --partners-animation-duration: 40s;
  }
  
  .partners-carousel {
    margin-top: 36px;
    padding: 18px 0;
  }
  
  .partners-carousel::before,
  .partners-carousel::after {
    top: 18px;
    bottom: 18px;
    width: 24px;
  }
  
  .partner-card {
    padding: 26px;
  }
  
  .partner-card h3 {
    font-size: 19px;
    min-height: 55px;
    max-height: 85px;
  }
}

/* Ultra-wide (1920px+) */
@media (min-width: 1920px) {
  .partners-section {
    --partners-gap: 28px;
    --partners-card-width: 360px;
    --partners-logo-size: 120px;
    --partners-blur-width: 28px;
    --partners-animation-duration: 40s;
  }
  
  .partners-carousel {
    margin-top: 40px;
    padding: 20px 0;
  }
  
  .partners-carousel::before,
  .partners-carousel::after {
    top: 20px;
    bottom: 20px;
    width: 28px;
  }
  
  .partner-card {
    padding: 28px;
  }
  
  .partner-card h3 {
    font-size: 20px;
    min-height: 60px;
    max-height: 90px;
  }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  .partners-track {
    animation: none;
  }
  
  .partners-carousel:hover .partners-track {
    animation-play-state: running;
  }
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */
.partners-track {
  backface-visibility: hidden;
  perspective: 1000px;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

.partner-card {
  backface-visibility: hidden;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

/* ===== UTILITY CLASSES ===== */
.partners-loading {
  opacity: 0.6;
  pointer-events: none;
}

.partners-error {
  background: rgba(255, 0, 0, 0.1);
  border: 1px solid rgba(255, 0, 0, 0.3);
}

.partner-card-hidden {
  display: none;
}

.partner-card-highlight {
  border: 2px solid var(--brand-primary);
  box-shadow: 0 8px 32px rgba(4, 53, 79, 0.2);
}