/* Karaoke Interface Styles - Enhanced UI */
@import url('../../css/tokens.css');
@import url('../../css/shared.css');

/* Hide screens by default */
.screen {
  display: none;
}

:root {
  --theme-bg-primary: #000000;
  --theme-bg-secondary: #1a1a1a;
  --theme-bg-tertiary: #252525;
  --theme-text-primary: var(--color-neutral-0);
  --theme-text-secondary: var(--color-neutral-300);
  --theme-border: rgba(255, 255, 255, 0.1);
  
  /* Animation Durations */
  --animation-fast: 200ms;
  --animation-normal: 300ms;
  --animation-slow: 500ms;
  
  /* Glass Effect */
  --glass-bg: rgba(26, 26, 26, 0.65);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: 12px;
}

body {
  background-color: var(--theme-bg-primary);
  color: var(--theme-text-primary);
  overflow-x: hidden;
  min-height: 100vh;
  
  /* Mobile: Simple dark gradient */
  background-image: linear-gradient(180deg, 
    var(--theme-bg-primary) 0%, 
    var(--theme-bg-secondary) 100%);
}

/* Desktop: Animated gradient background */
@media (min-width: 1024px) {
  body {
    background-image: linear-gradient(135deg, 
      var(--color-brand-secondary) 0%, 
      #000000 25%, 
      var(--color-brand-primary) 50%, 
      #000000 75%,
      var(--color-neutral-900) 100%);
    background-size: 400% 400%;
    animation: gradient-shift 30s ease infinite;
  }
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  25% { background-position: 50% 100%; }
  50% { background-position: 100% 50%; }
  75% { background-position: 50% 0%; }
}

/* Smooth animation preference */
@media (prefers-reduced-motion: reduce) {
  body {
    animation: none;
  }
}

/* =================================================================
   Login Screen Styles
   ================================================================= */

/* Login screen container */
#loginScreen {
  min-height: 100vh;
  width: 100%;
  display: flex;
  align-items: center; /* Vertically center */
}

.login-container {
  width: 100%;
  max-width: 400px;
  padding: var(--space-4);
  animation: fade-in-up var(--animation-slow) ease-out;
  margin: 0 auto; /* Horizontally center */
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.login-box {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  text-align: center;
}

/* Fallback for browsers without backdrop-filter */
@supports not (backdrop-filter: blur(12px)) {
  .login-box {
    background: rgba(26, 26, 26, 0.98);
  }
}

.login-box h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-2);
  color: var(--theme-text-primary);
  font-weight: var(--font-weight-bold);
}

.login-box p {
  color: var(--theme-text-secondary);
  margin-bottom: var(--space-5);
  font-size: var(--font-size-base);
}

/* Form styles */
.email-password-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.email-password-form input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--theme-border);
  border-radius: var(--radius-base);
  color: var(--theme-text-primary);
  font-size: var(--font-size-base);
  transition: all var(--animation-fast) ease;
  box-sizing: border-box;
}

.email-password-form input::placeholder {
  color: var(--theme-text-secondary);
  opacity: 0.7;
}

.email-password-form input:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px rgba(187, 134, 252, 0.2);
}

.form-actions {
  margin-top: var(--space-2);
}

.form-actions button,
#googleSignIn {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: none;
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--animation-fast) ease;
  min-height: 48px;
  position: relative;
  overflow: hidden;
}

#formSubmitBtn {
  background: var(--color-brand-primary);
  color: var(--color-neutral-900);
  box-shadow: 0 2px 8px rgba(187, 134, 252, 0.3);
}

#formSubmitBtn:hover {
  background: var(--color-brand-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(187, 134, 252, 0.5);
}

#formSubmitBtn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(187, 134, 252, 0.3);
}

/* Auth toggle */
.auth-toggle-container {
  margin: var(--space-4) 0;
}

.auth-toggle-container a {
  color: var(--color-brand-primary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: all var(--animation-fast) ease;
}

.auth-toggle-container a:hover {
  color: var(--color-brand-primary-hover);
  text-decoration: underline;
}

/* Divider */
.divider {
  position: relative;
  margin: var(--space-5) 0;
  color: var(--theme-text-secondary);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.divider::before,
.divider::after {
  content: '';
  position: absolute;
  top: 50%;
  width: calc(50% - 30px);
  height: 1px;
  background: var(--theme-border);
}

.divider::before {
  left: 0;
}

.divider::after {
  right: 0;
}

/* Google Sign In Button */
.google-signin-btn {
  background: white;
  color: #3c4043;
  border: 1px solid #dadce0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.google-signin-btn:hover {
  background: #f8f9fa;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  transform: translateY(-2px);
}

.google-signin-btn img {
  width: 20px;
  height: 20px;
}

/* Forgot password */
.forgot-password-container {
  margin-top: var(--space-3);
}

.forgot-password-container a {
  color: var(--theme-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: all var(--animation-fast) ease;
}

.forgot-password-container a:hover {
  color: var(--theme-text-primary);
  text-decoration: underline;
}

/* Party Code Modal */
.modal {
  display: none;
  position: fixed;
  z-index: var(--z-modal);
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fade-in var(--animation-fast) ease-out;
}

.modal-content {
  background: var(--theme-bg-secondary);
  margin: 15% auto;
  padding: var(--space-6);
  border: 1px solid var(--theme-border);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  animation: modal-slide-in var(--animation-normal) ease-out;
}

@keyframes modal-slide-in {
  from {
    transform: translateY(-50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-content h2 {
  color: var(--theme-text-primary);
  margin-bottom: var(--space-3);
}

.modal-content p {
  color: var(--theme-text-secondary);
  margin-bottom: var(--space-4);
}

.modal-content input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--theme-border);
  border-radius: var(--radius-base);
  color: var(--theme-text-primary);
  font-size: var(--font-size-lg);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
  transition: all var(--animation-fast) ease;
}

.modal-content input:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px rgba(187, 134, 252, 0.2);
}

.modal-content button {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-brand-primary);
  color: var(--color-neutral-900);
  border: none;
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--animation-fast) ease;
  box-shadow: 0 2px 8px rgba(187, 134, 252, 0.3);
}

.modal-content button:hover {
  background: var(--color-brand-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(187, 134, 252, 0.5);
}

/* Mobile adjustments for login */
@media (max-width: 639px) {
  .login-box {
    padding: var(--space-5);
  }
  
  .login-box h1 {
    font-size: var(--font-size-2xl);
  }
}

/* Main Container - Mobile First */
.main-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 1rem;
  max-width: 1400px;
  margin: 0 auto;
  min-height: calc(100vh - 80px);
}

/* Mobile: Queue first, Search second */
.search-section {
  order: 2;
  animation: fade-in var(--animation-slow) ease-out;
}

.queue-section {
  order: 1;
  animation: fade-in var(--animation-slow) ease-out;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Panel Styling - Mobile */
.search-section, .queue-section {
  background: var(--theme-bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--theme-border);
  padding: 1rem;
  transition: all var(--animation-normal) ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* Desktop Layout & Enhancements */
@media (min-width: 1024px) {
  .main-container {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 2rem;
    padding: 2rem;
  }
  
  /* Frosted glass effect on desktop with fallback */
  .search-section, .queue-section {
    order: initial;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    padding: 1.5rem;
  }
  
  /* Fallback for browsers without backdrop-filter support */
  @supports not (backdrop-filter: blur(12px)) {
    .search-section, .queue-section {
      background: rgba(26, 26, 26, 0.95);
    }
  }
  
  /* Hover effect on panels */
  .search-section:hover, .queue-section:hover {
    background: rgba(26, 26, 26, 0.75);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
  }
  
  .queue-section {
    height: fit-content;
    max-height: calc(100vh - 120px);
    position: sticky;
    top: 100px;
  }
}

/* Header */
.header {
  background: rgba(15, 15, 15, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--space-3) var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  border-bottom: 1px solid var(--theme-border);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  transition: all var(--animation-normal) ease;
}

/* Header scroll effect */
.header:hover {
  background: rgba(15, 15, 15, 0.95);
}

/* Now Playing - Hero Section */
.now-playing {
  background: linear-gradient(135deg, 
    var(--color-brand-primary) 0%, 
    var(--color-brand-secondary) 100%);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4),
              inset 0 1px 0 rgba(255, 255, 255, 0.1);
  position: relative;
  overflow: hidden;
  transition: all var(--animation-normal) ease;
}

/* Animated background pattern */
.now-playing::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, 
    rgba(255, 255, 255, 0.1) 1px, 
    transparent 1px);
  background-size: 50px 50px;
  opacity: 0.3;
  animation: pattern-move 20s linear infinite;
}

@keyframes pattern-move {
  0% { transform: translate(0, 0); }
  100% { transform: translate(50px, 50px); }
}

.now-playing > * {
  position: relative;
  z-index: 1;
}

/* Pulse animation when song changes */
.now-playing.pulse {
  animation: hero-pulse 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes hero-pulse {
  0% { 
    transform: scale(1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  }
  50% { 
    transform: scale(1.02);
    box-shadow: 0 12px 48px rgba(187, 134, 252, 0.6),
                0 0 80px rgba(187, 134, 252, 0.4);
  }
  100% { 
    transform: scale(1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .now-playing::before {
    animation: none;
  }
  .now-playing.pulse {
    animation: none;
  }
}

/* Song List */
.results-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  contain: layout style;
}

.song-card {
  background: transparent;
  border-radius: var(--radius-base);
  border: 1px solid transparent;
  padding: 0.75rem;
  transition: all var(--animation-fast) ease;
  opacity: 0;
  transform: translateY(10px);
  animation: card-enter var(--animation-normal) ease forwards;
  cursor: pointer;
  position: relative;
  contain: layout style paint;
}

/* Staggered animation via JS */
@keyframes card-enter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .song-card { 
    animation: none; 
    opacity: 1; 
    transform: none; 
  }
}

/* Hover state */
.song-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--glass-border);
  transform: translateX(4px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .song-card:hover {
    transform: none;
  }
}

/* Active/expanded state */
.song-card.is-expanded {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-brand-primary);
}

.song-card-main {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 48px;
}

.song-info {
  flex-grow: 1;
  overflow: hidden;
}

.song-title {
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-base);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--theme-text-primary);
  line-height: 1.2;
  margin-bottom: 2px;
}

.song-artist {
  color: var(--theme-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  opacity: 0.8;
}

.song-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.expand-btn {
  background: transparent;
  border: 1px solid var(--theme-border);
  color: var(--theme-text-secondary);
  border-radius: var(--radius-full);
  width: 44px;
  height: 44px;
  cursor: pointer;
  transition: all var(--animation-fast) ease;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}

/* Expand icon styling */
.expand-icon {
  display: block;
  transition: transform var(--animation-fast) ease;
  transform-origin: center;
  font-size: 1.5rem;
  line-height: 1;
}

/* Rotate when expanded */
.song-card.is-expanded .expand-icon {
  transform: rotate(90deg);
}

.expand-btn:hover, .expand-btn:active {
  background: rgba(255, 255, 255, 0.1);
  color: var(--theme-text-primary);
  border-color: var(--color-brand-primary);
  transform: scale(1.05);
}

/* Ripple effect on click */
.expand-btn:active::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  animation: ripple var(--animation-normal) ease-out;
}

@keyframes ripple {
  to {
    transform: translate(-50%, -50%) scale(2);
    opacity: 0;
  }
}

.song-thumbnail-container {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--animation-normal) ease-out;
  margin-top: 0;
}

.song-card.is-expanded .song-thumbnail-container {
  max-height: 300px;
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--theme-border);
}

/* Smooth appearance animation */
.song-thumbnail-container > * {
  opacity: 0;
  transform: translateY(-10px);
  transition: all var(--animation-normal) ease;
  transition-delay: 100ms;
}

.song-card.is-expanded .song-thumbnail-container > * {
  opacity: 1;
  transform: translateY(0);
}

.song-thumbnail {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-base);
  cursor: pointer;
}

.add-to-queue-btn {
  background: var(--color-brand-primary);
  color: var(--color-neutral-900);
  border: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  transition: all var(--animation-fast) ease;
  min-height: 44px;
  min-width: 80px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(187, 134, 252, 0.3);
}

.add-to-queue-btn:hover {
  background: var(--color-brand-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(187, 134, 252, 0.5);
}

.add-to-queue-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(187, 134, 252, 0.3);
}

/* Success state */
.add-to-queue-btn.is-added {
  background: var(--color-success);
  color: white;
  animation: success-bounce var(--animation-normal) ease;
}

/* Success checkmark animation */
.add-to-queue-btn.is-added::before {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  animation: checkmark-pop var(--animation-fast) ease-out forwards;
}

@keyframes success-bounce {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes checkmark-pop {
  to {
    transform: translate(-50%, -50%) scale(1.2);
  }
}

/* Queue Section */
.queue-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--theme-border);
}

.queue-header h2 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--theme-text-primary);
}

.queue-capacity {
  font-size: var(--font-size-sm);
  color: var(--theme-text-secondary);
  background: rgba(255, 255, 255, 0.1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

.queue-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-height: 400px;
  overflow-y: auto;
  padding-right: var(--space-2);
  
  /* Custom scrollbar */
  scrollbar-width: thin;
  scrollbar-color: var(--theme-border) transparent;
}

.queue-list::-webkit-scrollbar {
  width: 6px;
}

.queue-list::-webkit-scrollbar-track {
  background: transparent;
}

.queue-list::-webkit-scrollbar-thumb {
  background: var(--theme-border);
  border-radius: var(--radius-full);
}

.queue-list::-webkit-scrollbar-thumb:hover {
  background: var(--theme-text-secondary);
}

.queue-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-base);
  border: 1px solid transparent;
  transition: all var(--animation-fast) ease;
  animation: queue-item-enter var(--animation-normal) ease-out;
}

@keyframes queue-item-enter {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.queue-item:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--theme-border);
  transform: translateX(4px);
}

@media (prefers-reduced-motion: reduce) {
  .queue-item:hover {
    transform: none;
  }
}

/* Highlight user's own song */
.queue-item.is-user-song {
  background: rgba(187, 134, 252, 0.1);
  border-color: rgba(187, 134, 252, 0.3);
}

.queue-number {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--theme-text-secondary);
  min-width: 30px;
  text-align: center;
}

.queue-user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 2px solid var(--theme-border);
  background: var(--theme-bg-tertiary);
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.queue-user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Avatar initials fallback */
.queue-user-avatar.avatar-initials {
  background: linear-gradient(135deg, var(--color-brand-primary), var(--color-brand-secondary));
  color: white;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  user-select: none;
}

.queue-info {
  flex: 1;
  min-width: 0;
}

.queue-title-container {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.queue-title {
  font-weight: var(--font-weight-semibold);
  color: var(--theme-text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.queue-artist {
  font-size: var(--font-size-sm);
  color: var(--theme-text-secondary);
  opacity: 0.9;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.queue-user {
  font-size: var(--font-size-sm);
  color: var(--theme-text-secondary);
  opacity: 0.8;
}

/* YouTube Indicator - Consistent styling */
.youtube-indicator {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: #FF0000;
  color: white;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: bold;
  flex-shrink: 0;
  margin-left: var(--space-2);
  box-shadow: 0 2px 8px rgba(255, 0, 0, 0.3);
}

/* Larger variant for Now Playing section */
.youtube-indicator-large {
  width: 32px;
  height: 32px;
  font-size: var(--font-size-sm);
  margin-left: var(--space-3);
  box-shadow: 0 3px 12px rgba(255, 0, 0, 0.4);
}

/* User Queue Position */
#userQueuePosition {
  background: rgba(187, 134, 252, 0.1);
  border: 1px solid rgba(187, 134, 252, 0.3);
  border-radius: var(--radius-base);
  padding: var(--space-3);
  margin-bottom: var(--space-4);
  text-align: center;
  font-weight: var(--font-weight-semibold);
  animation: position-update var(--animation-normal) ease;
}

@keyframes position-update {
  from {
    background: rgba(187, 134, 252, 0.3);
  }
  to {
    background: rgba(187, 134, 252, 0.1);
  }
}

/* Search Section Enhancements */
.search-header {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

#searchInput {
  flex: 1;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--theme-border);
  color: var(--theme-text-primary);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  transition: all var(--animation-fast) ease;
}

#searchInput:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px rgba(187, 134, 252, 0.2);
}

#genreFilter {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--theme-border);
  color: var(--theme-text-primary);
  padding: var(--space-3);
  border-radius: var(--radius-base);
  min-width: 140px;
  cursor: pointer;
  transition: all var(--animation-fast) ease;
}

#genreFilter:hover, #genreFilter:focus {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-brand-primary);
  outline: none;
}

/* YouTube Link Section */
.youtube-link-section {
  margin-bottom: var(--space-4);
  padding: var(--space-4);
  background: rgba(255, 0, 0, 0.05);
  border-radius: var(--radius-base);
  border: 1px solid rgba(255, 0, 0, 0.2);
}

.youtube-link-container {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

#youtubeLinkInput {
  flex: 1;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 0, 0, 0.3);
  color: var(--theme-text-primary);
  padding: var(--space-3);
  border-radius: var(--radius-base);
  transition: all var(--animation-fast) ease;
}

#youtubeLinkInput:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.08);
  border-color: #FF0000;
  box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.2);
}

.add-youtube-btn {
  background: #FF0000;
  color: white;
  border: none;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full); /* Consistent with other buttons */
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  transition: all var(--animation-fast) ease;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  box-shadow: 0 2px 8px rgba(255, 0, 0, 0.3);
  min-height: 44px;
}

.add-youtube-btn:hover {
  background: #CC0000;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 0, 0, 0.5);
}

.add-youtube-btn:active {
  transform: translateY(0);
}

/* Loading States */
@keyframes skeleton-pulse {
  0% { opacity: 0.6; }
  50% { opacity: 1; }
  100% { opacity: 0.6; }
}

@keyframes skeleton-wave {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(90deg, 
    var(--theme-bg-tertiary) 25%, 
    rgba(255, 255, 255, 0.1) 50%, 
    var(--theme-bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite,
             skeleton-wave 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

/* Avatar loading state */
.queue-user-avatar.loading {
  background: var(--theme-bg-tertiary);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

/* Queue skeleton loading */
.queue-item-skeleton {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  opacity: 0.6;
}

.queue-item-skeleton .skeleton-number {
  width: 30px;
  height: 20px;
  background: var(--theme-bg-tertiary);
  border-radius: var(--radius-sm);
}

.queue-item-skeleton .skeleton-avatar {
  width: 36px;
  height: 36px;
  background: var(--theme-bg-tertiary);
  border-radius: var(--radius-full);
}

.queue-item-skeleton .skeleton-info {
  flex: 1;
}

.queue-item-skeleton .skeleton-title,
.queue-item-skeleton .skeleton-artist {
  height: 16px;
  background: var(--theme-bg-tertiary);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-1);
}

.queue-item-skeleton .skeleton-artist {
  width: 70%;
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}

/* Focus States - Enhanced for accessibility */
button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible {
  outline: 3px solid var(--color-brand-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(187, 134, 252, 0.3);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  button:focus-visible,
  input:focus-visible,
  select:focus-visible,
  a:focus-visible {
    outline-width: 4px;
  }
}

/* Transition Optimization */
* {
  will-change: auto;
}

.song-card,
.queue-item {
  contain: layout style;
}

.expand-btn,
.add-to-queue-btn {
  contain: paint;
}

/* Performance Optimizations */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Progress Bar Styling */
.progress-container {
  margin-top: var(--space-3);
}

.progress-bar {
  height: 6px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-2);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-brand-primary), var(--color-brand-secondary));
  border-radius: var(--radius-full);
  transition: width var(--animation-normal) ease;
  box-shadow: 0 0 10px rgba(187, 134, 252, 0.5);
}

.progress-time {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-sm);
  color: var(--theme-text-secondary);
}

/* Now Playing Typography */
.now-playing h3 {
  font-size: var(--font-size-sm);
  color: var(--theme-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}

.now-playing-title-container {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.now-playing-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--theme-text-primary);
}

.now-playing-artist {
  font-size: var(--font-size-lg);
  color: var(--theme-text-primary);
  opacity: 0.9;
  margin-bottom: var(--space-1);
}

.now-playing-user {
  font-size: var(--font-size-sm);
  color: var(--theme-text-secondary);
  opacity: 0.8;
  margin-bottom: var(--space-4);
}

/* User Info Styling */
.user-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

#userPhoto {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 2px solid var(--color-brand-primary);
}

/* Button Enhancements */
.sign-out-btn, .admin-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--theme-border);
  color: var(--theme-text-primary);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--animation-fast) ease;
  font-weight: var(--font-weight-medium);
}

.sign-out-btn:hover, .admin-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--color-brand-primary);
  transform: translateY(-1px);
}

/* Loading state for all buttons */
button.loading {
  opacity: 0.7;
  cursor: not-allowed;
  position: relative;
}

button.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: button-spin 0.8s linear infinite;
}

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

/* Remove Button */
.remove-btn {
  background: transparent;
  border: 1px solid var(--color-danger);
  color: var(--color-danger);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--animation-fast) ease;
  min-height: 36px;
  opacity: 0.8;
}

.remove-btn:hover {
  background: var(--color-danger);
  color: white;
  opacity: 1;
  transform: scale(1.05);
}

.remove-btn:active {
  transform: scale(0.95);
}

/* Empty States */
.empty-queue, .no-results {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  color: var(--theme-text-secondary);
  font-style: italic;
  opacity: 0.7;
  line-height: var(--line-height-base);
}

/* Consistent spacing between sections */
.search-header,
.youtube-link-section,
#searchResults,
.queue-header,
.queue-list {
  margin-bottom: var(--space-4);
}

.search-header:last-child,
.youtube-link-section:last-child,
#searchResults:last-child,
.queue-header:last-child,
.queue-list:last-child {
  margin-bottom: 0;
}

/* Responsive Adjustments */

/* Tablet breakpoint */
@media (min-width: 640px) and (max-width: 1023px) {
  .main-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
  }
  
  .search-section, .queue-section {
    order: initial;
  }
  
  .queue-section {
    max-height: 500px;
  }
  
  .now-playing-title {
    font-size: var(--font-size-xl);
  }
}

/* Mobile breakpoint */
@media (max-width: 639px) {
  :root {
    /* Smooth font scaling */
    --font-size-base: 0.9375rem; /* 15px */
    --font-size-lg: 1.0625rem;   /* 17px */
    --font-size-xl: 1.1875rem;   /* 19px */
    --font-size-2xl: 1.375rem;   /* 22px */
  }
  
  .main-container {
    padding: 0.75rem;
    gap: 1rem;
  }
  
  .search-section, .queue-section {
    padding: 0.75rem;
  }
  
  .song-card {
    padding: 0.75rem;
  }
  
  .queue-item {
    padding: var(--space-2);
  }
  
  .queue-section {
    max-height: 60vh; /* Better height on mobile */
  }
  
  .now-playing {
    padding: 1rem;
  }
  
  .now-playing-title {
    font-size: var(--font-size-xl);
  }
  
  /* Ensure 44px touch targets on mobile */
  .expand-btn,
  .add-to-queue-btn,
  .remove-btn,
  button {
    min-height: 44px;
    min-width: 44px;
  }
  
  .expand-btn {
    width: 44px;
    height: 44px;
  }
}