@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Open+Sans:wght@400;500;600;700&display=swap");

:root {
  --primary: #cb1c22;
  --primary-dark: #a31218;
  --primary-light: #e1383d;
  --secondary: #999999;
  --accent: #222222;
  --accent-light: #444444;
  --dark: #1d1d1b;
  --light: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #eeeeee;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --danger: #ef4444;
  --success: #28a745;
  --warning: #ffc107;
  --info: #17a2b8;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

  --shadow-primary: 0 8px 16px -1px rgba(203, 28, 34, 0.15),
    0 4px 6px -1px rgba(203, 28, 34, 0.1);
  --shadow-accent: 0 8px 16px -1px rgba(34, 34, 34, 0.15),
    0 4px 6px -1px rgba(34, 34, 34, 0.1);
  --shadow-success: 0 8px 16px -1px rgba(40, 167, 69, 0.15),
    0 4px 6px -1px rgba(40, 167, 69, 0.1);

  --transition-bounce: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 600ms cubic-bezier(0.25, 0.1, 0.25, 1.4);

  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-2xl: 1.5rem;
  --border-radius-full: 9999px;
}

span.link-label {
  color: #000000;
  font-size: 1.4rem;
  font-family: "Inter", "Open Sans", Arial, sans-serif;
  font-weight: 500;
}

*,
::after,
::before {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

h1,
.h1 {
  font-size: 3.15rem;
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 1.5rem;
}

h2,
.h2 {
  font-size: 2.7rem;
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 1.25rem;
}

h3,
.h3 {
  font-size: 1.8rem;
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 1rem;
}

h4,
.h4 {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

h5,
.h5 {
  font-size: 1.35rem;
  font-weight: 500;
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

h6,
.h6 {
  font-size: 1.2rem;
  font-weight: 500;
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
  font-size: 1.15rem;
}

.text-xs {
  font-size: 0.9rem;
}

.text-sm {
  font-size: 1.05rem;
}

.text-base {
  font-size: 1.425rem;
}

.text-lg {
  font-size: 1.5rem;
}

.text-xl {
  font-size: 1.8rem;
}

.text-2xl {
  font-size: 2.25rem;
}

.text-3xl {
  font-size: 2.7rem;
}

.text-4xl {
  font-size: 3.15rem;
}

.font-light {
  font-weight: 300;
}

.font-normal {
  font-weight: 400;
}

.font-medium {
  font-weight: 500;
}

.font-semibold {
  font-weight: 600;
}

.font-bold {
  font-weight: 700;
}

.leading-tight {
  line-height: 1.25;
}

.leading-normal {
  line-height: 1.5;
}

.leading-relaxed {
  line-height: 1.6;
}

.tracking-tight {
  letter-spacing: -0.025em;
}

.tracking-normal {
  letter-spacing: 0em;
}

.tracking-wide {
  letter-spacing: 0.025em;
}

@keyframes subtleBackgroundShift {
  0% {
    background-position: 0% 0%;
  }

  100% {
    background-position: 10% 10%;
  }
}

body {
  font-family: "Inter", "Open Sans", Arial, sans-serif;
  font-size: 1.5rem;
  line-height: 1.7;
  color: var(--dark);
  background-color: var(--light);
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  background-image: radial-gradient(
      circle at top right,
      rgba(229, 35, 33, 0.03),
      transparent 500px
    ),
    radial-gradient(
      circle at bottom left,
      rgba(34, 34, 34, 0.03),
      transparent 500px
    ),
    radial-gradient(
      circle at 30% 80%,
      rgba(241, 69, 66, 0.02),
      transparent 400px
    );
  min-height: 100vh;
  position: relative;
  animation: subtleBackgroundShift 20s ease-in-out infinite alternate;
}

@keyframes subtleBackgroundShift {
  0% {
    background-position: 0% 0%;
  }

  100% {
    background-position: 10% 10%;
  }
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  width: auto;
  box-sizing: border-box;
  box-sizing: border-box;
}

.page-header {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  padding: 60px 0 50px;
  margin-bottom: 50px;
  border-radius: 0 0 30px 30px;
  box-shadow: var(--shadow-xl), 0 0 25px rgba(229, 35, 33, 0.2);
  position: relative;
  overflow: hidden;
  animation: headerGradientShift 15s ease infinite alternate;
  text-align: center;
}

@keyframes headerGradientShift {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

.page-header::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
      circle,
      rgba(255, 255, 255, 0.12) 0%,
      rgba(255, 255, 255, 0) 70%
    ),
    linear-gradient(
      45deg,
      rgba(255, 255, 255, 0.08) 0%,
      rgba(255, 255, 255, 0) 70%
    );
  transform: rotate(-25deg);
  animation: shimmer 20s infinite linear;
}

.page-subtitle,
p.page-subtitle {
  text-align: center !important;
  margin-left: auto !important;
  margin-right: auto !important;
}

@keyframes shimmer {
  0% {
    transform: rotate(-25deg) translateY(0);
  }

  50% {
    transform: rotate(-25deg) translateY(5%);
  }

  100% {
    transform: rotate(-25deg) translateY(0);
  }
}

.page-title {
  font-size: 4.2rem;
  font-weight: 800;
  margin: 0;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  position: relative;
  z-index: 1;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, white, rgba(255, 255, 255, 0.85));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-subtitle {
  font-size: 1.8rem;
  font-weight: 400;
  opacity: 0.95;
  max-width: 700px;
  position: relative;
  z-index: 1;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.alert-danger {
  background-color: rgba(229, 35, 33, 0.08);
  border-color: rgba(229, 35, 33, 0.2);
  color: #b91c1c;
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.2);
  color: #065f46;
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.2);
  color: #92400e;
}

.alert-info {
  background-color: rgba(59, 130, 246, 0.08);
  border-color: rgba(59, 130, 246, 0.2);
  color: #1e40af;
}

.alert-icon {
  margin-right: 16px;
  font-size: 1.8rem;
}

.alert-content {
  flex: 1;
  font-size: 1.15rem;
}

.alert-close {
  background: none;
  border: none;
  color: var(--gray-500);
  font-size: 1.56rem;
  cursor: pointer;
  transition: color var(--transition-fast);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 10px;
}

.alert-close:hover {
  color: var(--dark);
  background-color: rgba(0, 0, 0, 0.05);
}

.alert-danger .alert-close:hover {
  background-color: rgba(229, 35, 33, 0.08);
  color: var(--primary-dark);
}

.alert-success .alert-close:hover {
  background-color: rgba(16, 185, 129, 0.08);
  color: #065f46;
}

.alert-warning .alert-close:hover {
  background-color: rgba(245, 158, 11, 0.08);
  color: #92400e;
}

.alert-info .alert-close:hover {
  background-color: rgba(59, 130, 246, 0.08);
  color: #1e40af;
}

.flag-icon {
  margin-right: 8px;
  vertical-align: middle;
}

.form-group label {
  font-size: 1.6rem;
  font-weight: 500;
  margin-bottom: 1rem;
  display: block;
  color: var(--dark);
}

.form-control {
  font-size: 1.4rem;
  padding: 0.85rem 1.2rem;
  line-height: 1.6;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--gray-300);
  transition: all var(--transition-normal);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(203, 28, 34, 0.15);
  outline: none;
}

.btn-default {
  font-size: 1.4rem;
  padding: 0.85rem 1.8rem;
}

.language-selector {
  margin-bottom: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  position: relative;
  z-index: 2;
}

.language-btn {
  padding: 14px 28px;
  border: none;
  background-color: rgba(255, 255, 255, 0.9);
  color: var(--gray-500);
  cursor: pointer;
  border-radius: var(--border-radius-full);
  font-weight: 600;
  font-size: 1.32rem;
  transition: all var(--transition-normal), transform var(--transition-bounce),
    box-shadow var(--transition-normal);
  box-shadow: var(--shadow-md), 0 4px 6px rgba(0, 0, 0, 0.03);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--gray-200);
}

.language-btn:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    45deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.language-btn:hover:before {
  transform: translateX(100%);
}

.language-btn:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
    circle at center,
    rgba(255, 255, 255, 0.8) 0%,
    transparent 70%
  );
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.language-btn:hover {
  background-color: white;
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-lg), 0 8px 15px rgba(229, 35, 33, 0.15);
  color: var(--primary);
}

.language-btn:hover:after {
  opacity: 0.15;
}

.language-btn.active {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  background-size: 200% 200%;
  color: white;
  box-shadow: var(--shadow-primary);
  border-color: transparent;
  animation: gradientShift 3s ease infinite alternate;
}

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }

  100% {
    background-position: 100% 50%;
  }
}

.language-btn.active:hover {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  background-size: 200% 200%;
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-primary), 0 10px 20px rgba(229, 35, 33, 0.25);
}

.language-btn i {
  margin-right: 10px;
  font-size: 1.44rem;
  transition: transform var(--transition-bounce);
}

.language-btn:hover i {
  transform: rotate(5deg) scale(1.1);
}

.video-section {
  display: none;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.video-section.active {
  display: block;
  opacity: 1;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section-title {
  font-size: 2.9rem;
  font-weight: 800;
  margin: 45px 0 35px;
  color: var(--primary-dark);
  position: relative;
  padding-bottom: 15px;
  letter-spacing: -0.01em;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  transition: all var(--transition-normal);
}

.section-title:hover {
  transform: translateX(3px);
  color: var(--primary);
}

.section-title:after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 4px;
  background: linear-gradient(to right, var(--primary), var(--accent));
  border-radius: 4px;
  transition: width var(--transition-normal), opacity var(--transition-normal);
}

.section-title:before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 4px;
  background: linear-gradient(to right, var(--accent), var(--primary-light));
  border-radius: 4px;
  opacity: 0;
  transition: width var(--transition-normal), opacity var(--transition-normal);
}

.section-title:hover:after {
  width: 120px;
}

.section-title:hover:before {
  width: 40px;
  opacity: 1;
}

.video-categories {
  background: white;
  padding: 30px;
  border-radius: var(--border-radius-xl);
  margin-bottom: 40px;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  border: 1px solid rgba(255, 255, 255, 0.7);
}

.video-categories:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-5px);
}

.video-categories .categories-title {
  font-size: 1.92rem;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 28px;
  color: var(--dark);
}

.video-categories .categories-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.video-categories .category-link {
  display: inline-flex;
  align-items: center;
  padding: 14px 24px;
  background-color: var(--gray-100);
  color: var(--gray-500);
  border-radius: var(--border-radius-full);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.26rem;
  transition: all var(--transition-normal), transform var(--transition-bounce),
    box-shadow var(--transition-normal);
  box-shadow: var(--shadow-sm), 0 2px 5px rgba(0, 0, 0, 0.02);
  border: 1px solid var(--gray-200);
  position: relative;
  overflow: hidden;
}

.video-categories .category-link:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    to right,
    rgba(255, 255, 255, 0.1),
    rgba(255, 255, 255, 0.2),
    rgba(255, 255, 255, 0.1)
  );
  transform: translateX(-100%);
  transition: transform 0.8s ease;
}

.video-categories .category-link:hover:before {
  transform: translateX(100%);
}

.video-categories .category-link:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 5px;
  bottom: 0;
  left: 0;
  background: linear-gradient(to right, var(--primary-light), var(--primary));
  opacity: 0;
  transform: translateY(5px);
  transition: opacity 0.3s, transform 0.3s;
}

.video-categories .category-link:hover {
  background-color: var(--primary-light);
  color: white;
  transform: translateY(-5px);
  box-shadow: var(--shadow-primary);
  border-color: transparent;
}

.video-categories .category-link:hover:after {
  opacity: 1;
  transform: translateY(0);
}

.video-categories .category-link i {
  margin-right: 12px;
  font-size: 1.44rem;
  transition: transform var(--transition-bounce);
}

.video-categories .category-link:hover i {
  transform: translateY(-2px) scale(1.1);
}

.video-categories .category-link.active {
  background-color: var(--primary);
  color: white;
  box-shadow: var(--shadow-primary);
  border-color: transparent;
  position: relative;
}

.video-categories .category-link.active:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 5px;
  bottom: 0;
  left: 0;
  background: linear-gradient(to right, var(--accent-light), var(--accent));
  opacity: 1;
  transform: translateY(0);
}

.video-categories .category-link.active i {
  transform: scale(1.1);
  animation: wiggle 2s infinite;
}

@keyframes wiggle {
  0%,
  100% {
    transform: translateX(0) scale(1.1);
  }

  25% {
    transform: translateX(-2px) scale(1.1);
  }

  75% {
    transform: translateX(2px) scale(1.1);
  }
}

@media (max-width: 1200px) {
  .video-categories .category-link {
    width: 100%;
    padding: 12px 20px;
    font-size: 1.32rem;
    justify-content: flex-start;
  }
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 35px;
  margin-bottom: 60px;
}

.video-container {
  background: white;
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal), transform var(--transition-bounce),
    box-shadow var(--transition-slow);
  height: 100%;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--gray-200);
  position: relative;
  animation: breathe 6s infinite ease-in-out alternate;
}

@keyframes breathe {
  0% {
    box-shadow: var(--shadow-md);
  }

  100% {
    box-shadow: var(--shadow-lg), 0 0 20px rgba(229, 35, 33, 0.1);
  }
}

.video-container:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-xl), 0 10px 20px rgba(229, 35, 33, 0.15);
  border-color: var(--gray-300);
  animation-play-state: paused;
}

.video-container:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(to right, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.video-container:hover:before {
  opacity: 1;
}

.video-preview {
  position: relative;
  background: var(--gray-100);
  overflow: hidden;
}

.embed-responsive {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
}

.embed-responsive::after {
  content: none !important;
}

.video-container:hover .embed-responsive::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.05);
  transition: background var(--transition-normal),
    opacity var(--transition-normal);
  opacity: 1;
  pointer-events: none;
  z-index: 0;
}

.embed-responsive iframe,
.embed-responsive video {
  position: absolute !important;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  z-index: 1;
  pointer-events: auto;
  transition: transform var(--transition-normal);
}

.video-container:hover .embed-responsive iframe,
.video-container:hover .embed-responsive video {
  transform: scale(1.02);
}

.video-info {
  padding: 28px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.video-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--dark);
  margin-top: 0;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  line-height: 1.4;
}

.video-title i {
  color: var(--primary);
  margin-right: 14px;
  font-size: 1.8rem;
}

.video-description {
  color: var(--gray-500);
  margin-bottom: 20px;
  font-size: 1.26rem;
  line-height: 1.7;
}

.video-meta {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid var(--gray-200);
  font-size: 1.14rem;
  color: var(--gray-400);
}

.video-duration {
  display: flex;
  align-items: center;
}

.video-duration i {
  margin-right: 8px;
  font-size: 1.26rem;
}

.video-type {
  padding: 6px 12px;
  background-color: var(--gray-100);
  border-radius: var(--border-radius-md);
  font-weight: 500;
  transition: all var(--transition-normal);
}

.video-container:hover .video-type {
  transform: scale(1.05);
}

.video-type.youtube {
  background-color: rgba(229, 35, 33, 0.1);
  color: #c41c1a;
}

.video-type.mp4 {
  background-color: rgba(16, 185, 129, 0.1);
  color: #065f46;
}

.video-category {
  margin-bottom: 80px;
  position: relative;
}

.category-header {
  display: flex;
  align-items: center;
  margin-bottom: 30px;
}

.category-icon {
  font-size: 2.16rem;
  width: 65px;
  height: 65px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  color: white;
  border-radius: 50% !important;
  overflow: hidden !important;
  margin-right: 20px;
  box-shadow: 0 8px 16px rgba(229, 35, 33, 0.25);
  position: relative;
  overflow: hidden;
  border: 2px solid rgba(255, 255, 255, 0.2);
  filter: drop-shadow(0 5px 15px rgba(229, 35, 33, 0.3));
}

.category-icon:after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: rgba(255, 255, 255, 0.1);
  transform: rotate(45deg);
  animation: shimmerIcon 3s infinite linear;
  border-radius: 50%;
}

@keyframes shimmerIcon {
  0% {
    transform: rotate(45deg) translateX(-100%);
  }

  100% {
    transform: rotate(45deg) translateX(100%);
  }
}

.category-title {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--dark);
  margin: 0;
}

.back-to-top {
  position: fixed;
  bottom: 35px;
  right: 35px;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  background-size: 200% 200%;
  color: white;
  border: none;
  border-radius: 50%;
  box-shadow: 0 8px 20px rgba(229, 35, 33, 0.4);
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px) scale(0.9);
  transition: all var(--transition-normal), transform var(--transition-bounce);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.68rem;
  z-index: 100;
  overflow: hidden;
  animation: pulse 2s infinite alternate, gradientMove 4s infinite linear;
}

@keyframes gradientMove {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  animation: pulse 2s infinite alternate, gradientMove 4s infinite linear;
}

.back-to-top:hover {
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 12px 24px rgba(229, 35, 33, 0.5),
    0 0 15px rgba(229, 35, 33, 0.3);
  animation-play-state: paused;
}

.back-to-top:before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background: radial-gradient(
    circle,
    rgba(255, 255, 255, 0.3) 0%,
    rgba(255, 255, 255, 0) 70%
  );
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.back-to-top:hover:before {
  opacity: 1;
}

.back-to-top:after {
  content: "";
  position: absolute;
  width: 15px;
  height: 15px;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  filter: blur(5px);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: glow 2s infinite alternate;
}

@keyframes glow {
  0% {
    width: 15px;
    height: 15px;
    opacity: 0.5;
  }

  100% {
    width: 25px;
    height: 25px;
    opacity: 0.2;
  }
}

.decoration {
  position: absolute;
  border-radius: 50%;
  z-index: -1;
  opacity: 0.12;
  animation: float 15s infinite ease-in-out;
  filter: blur(3px);
  box-shadow: inset 0 0 30px rgba(255, 255, 255, 0.3),
    0 10px 30px rgba(0, 0, 0, 0.05);
}

@keyframes float {
  0% {
    transform: translateY(0) rotate(0deg);
  }

  25% {
    transform: translateY(-15px) rotate(3deg) scale(1.02);
  }

  50% {
    transform: translateY(-25px) rotate(5deg) scale(1.05);
  }

  75% {
    transform: translateY(-15px) rotate(3deg) scale(1.02);
  }

  100% {
    transform: translateY(0) rotate(0deg);
  }
}

.decoration-1 {
  width: 350px;
  height: 350px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  top: -180px;
  right: -180px;
  animation-delay: 0s;
  animation-duration: 20s;
}

.decoration-1:after {
  content: "";
  position: absolute;
  top: 20%;
  left: 20%;
  width: 60%;
  height: 60%;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  filter: blur(15px);
  animation: pulse 5s infinite alternate;
}

.decoration-2 {
  width: 250px;
  height: 250px;
  background: linear-gradient(135deg, var(--accent), var(--primary));
  bottom: 50px;
  left: -120px;
  animation-delay: -5s;
  animation-duration: 18s;
}

.decoration-2:after {
  content: "";
  position: absolute;
  top: 25%;
  left: 25%;
  width: 50%;
  height: 50%;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  filter: blur(12px);
  animation: pulse 7s infinite alternate;
}

.decoration-3 {
  width: 180px;
  height: 180px;
  background: linear-gradient(
    135deg,
    var(--primary-light),
    var(--accent-light)
  );
  bottom: -90px;
  right: 10%;
  animation-delay: -10s;
  animation-duration: 22s;
}

.decoration-3:after {
  content: "";
  position: absolute;
  top: 30%;
  left: 30%;
  width: 40%;
  height: 40%;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  filter: blur(8px);
  animation: pulse 6s infinite alternate;
}

@keyframes pulse {
  0% {
    opacity: 0.5;
    transform: scale(0.8);
  }

  100% {
    opacity: 1;
    transform: scale(1.2);
  }
}

.section-footer {
  margin-top: 90px;
  padding: 40px 0;
  text-align: center;
  color: var(--gray-500);
  border-top: 1px solid var(--gray-200);
  background-color: white;
  position: relative;
}

.help-text {
  max-width: 700px;
  margin: 0 auto;
  font-size: 1.38rem;
  line-height: 1.7;
}

.help-link {
  display: inline-block;
  margin-top: 22px;
  background: white;
  border: 1px solid var(--gray-300);
  color: var(--primary);
  padding: 12px 28px;
  border-radius: var(--border-radius-full);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.32rem;
  transition: all var(--transition-normal), transform var(--transition-bounce);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.help-link:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--primary);
  border-radius: var(--border-radius-full);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.5s ease;
  z-index: -1;
}

.help-link:hover {
  color: white;
  border-color: var(--primary);
  box-shadow: var(--shadow-primary);
  transform: translateY(-3px) scale(1.05);
}

.help-link:hover:before {
  transform: scaleX(1);
  transform-origin: left;
}

.help-link:after {
  content: "→";
  margin-left: 8px;
  opacity: 0;
  transform: translateX(-5px);
  display: inline-block;
  transition: all var(--transition-normal);
}

.help-link:hover:after {
  opacity: 1;
  transform: translateX(3px);
}

.help-link i {
  margin-right: 10px;
}

.loader {
  display: inline-block;
  width: 38px;
  height: 38px;
  border: 3px solid rgba(0, 0, 0, 0.1);
  border-radius: 50%;
  border-top-color: var(--primary);
  animation: spin 1s ease-in-out infinite;
  margin-right: 14px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-text {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 40px auto;
  color: var(--gray-500);
  font-weight: 500;
  font-size: 1.44rem;
  background: white;
  padding: 15px 30px;
  border-radius: var(--border-radius-full);
  box-shadow: var(--shadow-md);
}

@media (max-width: 1200px) {
  body {
    font-size: 19.2px;
    overflow-x: hidden;
  }

  .page-header {
    padding: 35px 0;
    margin-bottom: 35px;
  }

  .page-title {
    font-size: 3rem;
  }

  .page-subtitle {
    font-size: 1.44rem;
  }

  .video-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .category-title {
    font-size: 2.04rem;
  }

  .language-btn {
    flex: 1;
    min-width: 120px;
    font-size: 1.2rem;
    padding: 12px 20px;
  }

  .back-to-top {
    width: 50px;
    height: 50px;
    bottom: 25px;
    right: 25px;
  }

  .section-title {
    font-size: 2.4rem;
  }

  .video-info {
    padding: 22px;
  }
}

.side-nav {
  position: center;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100vh;
  z-index: 9999;
  transition: transform var(--transition-normal);
}

.side-nav.open {
  transform: translateX(100%);
}

@supports (backdrop-filter: blur(10px)) {
  .video-container {
    background: white;
  }

  .video-info {
    background: white;
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }

  100% {
    transform: scale(1);
  }
}

.language-btn.active {
  animation: pulse 2s infinite;
}

::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 6px;
  border: 3px solid var(--gray-100);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

@media (max-width: 1200px) {
  .video-categories .categories-nav {
    display: flex;
    flex-direction: column;
    width: 100%;
  }

  .video-categories {
    padding: 20px;
  }
}

/* optimisation for tablets*/

.video-container,
.language-btn,
.page-header,
.back-to-top,
.category-icon,
.video-preview,
.embed-responsive iframe,
.embed-responsive video,
.navbar,
.navbar-brand,
.category-link {
  transform: translateZ(0);
  backface-visibility: hidden;
  perspective: 1000px;
  will-change: transform;
}

@media (max-width: 1024px) {
  body {
    animation: none;
  }

  .decoration {
    display: none;
  }

  .page-header::before {
    animation: none;
  }

  .video-container:hover,
  .language-btn:hover,
  .category-link:hover {
    transform: translateY(-2px) translateZ(0);
    transition: transform 0.2s ease;
  }

  .video-container,
  .video-categories,
  .language-btn {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  }
}

.training-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 2rem;
  font-size: 1.2rem;
}