/* =====================================================
   GTR NORSOK M-501 + EPOXY - Platforma Szkoleniowa
   Dark Premium Theme
   ===================================================== */

/* === Zmienne CSS === */
:root {
  /* Kolory główne */
  --color-bg-dark: #0a0a0f;
  --color-bg-card: rgba(15, 15, 25, 0.8);
  --color-bg-glass: rgba(255, 255, 255, 0.03);
  --color-gold: #8D242A;
  --color-gold-light: #a52d35;
  --color-gold-dark: #6d1c21;
  --color-blue: #8D242A;
  --color-blue-light: #a52d35;
  --color-text: #ffffff;
  --color-text-muted: #a0a0a0;
  --color-text-dim: #666666;
  --color-success: #4caf50;
  --color-error: #f44336;
  --color-warning: #ff9800;

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* === Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: var(--color-bg-dark);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(141, 36, 42, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(141, 36, 42, 0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

a {
  color: var(--color-gold);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-gold-light);
}

img {
  max-width: 100%;
  height: auto;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--spacing-md);
}

/* === Layout === */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding: var(--spacing-2xl) 0;
}

/* === Glass Card === */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  padding: var(--spacing-xl);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* === Header === */
.kurs-header {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.kurs-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.kurs-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.kurs-logo img {
  height: 40px;
  width: auto;
}

.kurs-logo-text {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-gold);
}

.kurs-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.kurs-nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.kurs-nav a:hover,
.kurs-nav a.active {
  color: var(--color-gold);
}

.btn-logout {
  background: transparent;
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.btn-logout:hover {
  background: var(--color-gold);
  color: var(--color-bg-dark);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-dark));
  color: var(--color-bg-dark);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-gold-light), var(--color-gold));
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(201, 169, 98, 0.3);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
}

.btn-secondary:hover {
  background: rgba(201, 169, 98, 0.1);
}

.btn-disabled,
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-large {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: 1.1rem;
}

.btn-small {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
}

/* === Forms === */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.form-input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px rgba(201, 169, 98, 0.2);
}

.form-input::placeholder {
  color: var(--color-text-dim);
}

.form-error {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-top: var(--spacing-sm);
}

.form-success {
  color: var(--color-success);
  font-size: 0.875rem;
  margin-top: var(--spacing-sm);
}

/* === Login Page === */
.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

.login-card {
  width: 100%;
  max-width: 450px;
  text-align: center;
}

.login-logo {
  margin-bottom: var(--spacing-xl);
}

.login-logo img {
  height: 60px;
  margin-bottom: var(--spacing-md);
}

.login-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.login-subtitle {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-xl);
}

.login-form {
  text-align: left;
}

.code-input {
  text-align: center;
  font-size: 1.25rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* === Dashboard === */
.dashboard-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.dashboard-title {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.dashboard-subtitle {
  color: var(--color-text-muted);
}

/* Progress Bar */
.progress-container {
  margin-bottom: var(--spacing-2xl);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.progress-label {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.progress-value {
  color: var(--color-gold);
  font-weight: 600;
}

.progress-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-gold-dark), var(--color-gold));
  border-radius: 4px;
  transition: width var(--transition-slow);
}

/* Lessons List */
.lessons-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.lesson-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

.lesson-card:hover:not(.lesson-locked) {
  border-color: var(--color-gold);
  transform: translateX(4px);
}

.lesson-card.lesson-locked {
  opacity: 0.5;
  cursor: not-allowed;
}

.lesson-card.lesson-completed {
  border-color: var(--color-success);
}

.lesson-card.lesson-current {
  border-color: var(--color-gold);
  background: rgba(201, 169, 98, 0.05);
}

.lesson-number {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.lesson-completed .lesson-number {
  background: var(--color-success);
  color: white;
}

.lesson-current .lesson-number {
  background: var(--color-gold);
  color: var(--color-bg-dark);
}

.lesson-info {
  flex: 1;
}

.lesson-title {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.lesson-meta {
  display: flex;
  gap: var(--spacing-md);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.lesson-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.status-icon {
  width: 24px;
  height: 24px;
}

/* Exam Button */
.exam-section {
  margin-top: var(--spacing-2xl);
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
}

.exam-section h3 {
  margin-bottom: var(--spacing-md);
}

.exam-section p {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

/* === Video Player Page === */
.player-wrapper {
  max-width: 960px;
  margin: 0 auto;
}

.player-header {
  margin-bottom: var(--spacing-lg);
}

.player-back {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  font-size: 0.9rem;
}

.player-back:hover {
  color: var(--color-gold);
}

.player-title {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-sm);
}

.player-lesson-num {
  color: var(--color-gold);
}

.player-description {
  color: var(--color-text-muted);
}

/* Video Container */
.video-container {
  position: relative;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--spacing-lg);
}

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

.video-element {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Custom Video Controls */
.video-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

.video-controls.show {
  opacity: 1;
}

.control-btn {
  background: transparent;
  border: none;
  color: white;
  cursor: pointer;
  padding: var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
}

.control-btn:hover {
  color: var(--color-gold);
}

.control-btn svg {
  width: 24px;
  height: 24px;
}

.volume-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.volume-slider {
  width: 80px;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.3);
  height: 4px;
  border-radius: 2px;
  cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  background: var(--color-gold);
  border-radius: 50%;
}

.time-display {
  color: white;
  font-size: 0.875rem;
  margin-left: auto;
}

.fullscreen-btn {
  margin-left: var(--spacing-sm);
}

/* Progress indicator (non-interactive) */
.video-progress-bar {
  position: absolute;
  bottom: 60px;
  left: var(--spacing-lg);
  right: var(--spacing-lg);
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  pointer-events: none;
}

.video-progress-fill {
  height: 100%;
  background: var(--color-gold);
  border-radius: 2px;
  transition: width 0.1s linear;
}

/* Video Loading */
.video-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  color: white;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--color-gold);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Player Navigation */
.player-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--glass-border);
}

.lesson-complete-msg {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-success);
  font-weight: 500;
}

/* === Exam Page === */
.exam-wrapper {
  max-width: 800px;
  margin: 0 auto;
}

.exam-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.exam-timer {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  font-size: 1.25rem;
  font-weight: 600;
}

.exam-timer.warning {
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.exam-timer.danger {
  border-color: var(--color-error);
  color: var(--color-error);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.exam-progress {
  margin: var(--spacing-lg) 0;
}

.exam-progress-text {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

/* Question Card */
.question-card {
  margin-bottom: var(--spacing-xl);
}

.question-number {
  color: var(--color-gold);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-sm);
}

.question-text {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
}

.answers-list {
  display: grid;
  gap: var(--spacing-md);
}

.answer-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--glass-bg);
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.answer-option:hover {
  border-color: var(--color-gold);
  background: rgba(201, 169, 98, 0.05);
}

.answer-option.selected {
  border-color: var(--color-gold);
  background: rgba(201, 169, 98, 0.1);
}

.answer-option.correct {
  border-color: var(--color-success);
  background: rgba(76, 175, 80, 0.1);
}

.answer-option.incorrect {
  border-color: var(--color-error);
  background: rgba(244, 67, 54, 0.1);
}

.answer-radio {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-text-muted);
  border-radius: 50%;
  flex-shrink: 0;
  position: relative;
}

.answer-option.selected .answer-radio {
  border-color: var(--color-gold);
}

.answer-option.selected .answer-radio::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 10px;
  background: var(--color-gold);
  border-radius: 50%;
}

.answer-text {
  flex: 1;
}

/* Exam Navigation */
.exam-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--glass-border);
}

.question-dots {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.question-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.question-dot.answered {
  background: var(--color-gold);
}

.question-dot.current {
  transform: scale(1.3);
  box-shadow: 0 0 0 2px var(--color-gold);
}

/* === Results Page === */
.results-wrapper {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.results-icon {
  width: 120px;
  height: 120px;
  margin: 0 auto var(--spacing-xl);
}

.results-icon.success {
  color: var(--color-success);
}

.results-icon.failure {
  color: var(--color-error);
}

.results-score {
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.results-score.passed {
  color: var(--color-success);
}

.results-score.failed {
  color: var(--color-error);
}

.results-message {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

.results-details {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-2xl);
}

/* Certificate Form */
.certificate-form {
  text-align: left;
  margin-top: var(--spacing-2xl);
}

.certificate-form h3 {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

/* === Congratulations Page === */
.congrats-wrapper {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.congrats-animation {
  margin-bottom: var(--spacing-xl);
}

.congrats-icon {
  width: 150px;
  height: 150px;
  margin: 0 auto;
  color: var(--color-gold);
  animation: celebratePop 0.5s ease-out;
}

@keyframes celebratePop {
  0% { transform: scale(0); opacity: 0; }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); opacity: 1; }
}

.confetti {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1000;
}

.congrats-title {
  font-size: 2.5rem;
  color: var(--color-gold);
  margin-bottom: var(--spacing-md);
}

.congrats-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-2xl);
}

.congrats-info {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.congrats-info p {
  margin-bottom: var(--spacing-sm);
}

.congrats-info strong {
  color: var(--color-gold);
}

/* === Alerts === */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.alert-success {
  background: rgba(76, 175, 80, 0.1);
  border: 1px solid var(--color-success);
  color: var(--color-success);
}

.alert-error {
  background: rgba(244, 67, 54, 0.1);
  border: 1px solid var(--color-error);
  color: var(--color-error);
}

.alert-warning {
  background: rgba(255, 152, 0, 0.1);
  border: 1px solid var(--color-warning);
  color: var(--color-warning);
}

.alert-info {
  background: rgba(0, 38, 119, 0.1);
  border: 1px solid var(--color-blue);
  color: var(--color-blue-light);
}

/* === Footer === */
.kurs-footer {
  background: var(--glass-bg);
  border-top: 1px solid var(--glass-border);
  padding: var(--spacing-lg) 0;
  text-align: center;
}

.kurs-footer p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin: 0;
}

/* === Responsive Design === */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
  }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .kurs-header .container {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .lesson-card {
    flex-direction: column;
    text-align: center;
  }

  .lesson-meta {
    justify-content: center;
  }

  .player-nav {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .exam-nav {
    flex-direction: column;
    gap: var(--spacing-lg);
  }

  .video-controls {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
  }

  .volume-slider {
    width: 60px;
  }

  .time-display {
    font-size: 0.75rem;
  }

  .results-score {
    font-size: 3rem;
  }

  .congrats-title {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

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

  .btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.9rem;
  }

  .btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
  }

  .question-text {
    font-size: 1.1rem;
  }

  .answer-option {
    padding: var(--spacing-md);
  }
}

/* === Utilities === */
.text-center { text-align: center; }
.text-gold { color: var(--color-gold); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.hidden { display: none !important; }
.visible { display: block !important; }

/* === No select for video area === */
.no-select {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

/* === Disable context menu on video === */
.video-container {
  -webkit-touch-callout: none;
}