* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors from UI spec */
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-850: #172033;
  --color-gray-900: #0f172a;
  --color-gray-950: #020617;

  --color-blue-400: #60a5fa;
  --color-blue-500: #3b82f6;
  --color-blue-600: #2563eb;
  --color-blue-700: #1d4ed8;

  --color-cyan-400: #22d3ee;
  --color-cyan-500: #06b6d4;
  --color-cyan-600: #0891b2;

  --color-green-600: #16a34a;
  --color-green-700: #15803d;

  --color-red-400: #f87171;
  --color-red-500: #ef4444;
  --color-red-600: #dc2626;

  --color-gray-750: #1a2332;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(
    to bottom right,
    var(--color-gray-950),
    var(--color-gray-950),
    var(--color-gray-900)
  );
  color: var(--color-gray-100);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.3s, color 0.3s;
}

/* Light Mode */
body:not(.dark) {
  background: linear-gradient(
    to bottom right,
    var(--color-gray-50),
    rgba(239, 246, 255, 0.3),
    rgba(207, 250, 254, 0.3)
  );
  color: var(--color-gray-900);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem;
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: 1rem;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-800);
}

body:not(.dark) header {
  background: rgba(255, 255, 255, 0.8);
  border-bottom-color: var(--color-gray-200);
}

body:not(.dark) header {
  background: rgba(255, 255, 255, 0.8);
  border-bottom-color: var(--color-gray-200);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: white;
  font-size: 1.5rem;
  font-weight: 700;
}

body:not(.dark) .logo {
  color: var(--color-gray-900);
}

.logo-gradient {
  background: linear-gradient(
    to right,
    var(--color-blue-400),
    var(--color-cyan-400)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

a {
  color: var(--color-gray-300);
}

a:hover {
  color: var(--color-cyan-400);
}

body:not(.dark) a {
  color: var(--color-gray-600);
}

body:not(.dark) a:hover {
  color: var(--color-blue-600);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--color-gray-300);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-cyan-400);
}

body:not(.dark) .nav-links a {
  color: var(--color-gray-600);
}

body:not(.dark) .nav-links a:hover {
  color: var(--color-blue-600);
}

.theme-toggle {
  background: var(--color-gray-800);
  border: 1px solid var(--color-gray-700);
  color: var(--color-cyan-400);
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.theme-toggle:hover {
  background: var(--color-gray-700);
}

body:not(.dark) .theme-toggle {
  background: var(--color-gray-100);
  border-color: var(--color-gray-200);
  color: var(--color-gray-700);
}

body:not(.dark) .theme-toggle:hover {
  background: var(--color-gray-200);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger span {
  width: 1.5rem;
  height: 2px;
  background: var(--color-gray-300);
  border-radius: 2px;
  transition: all 0.3s;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

body:not(.dark) .hamburger span {
  background: var(--color-gray-700);
}

.header-spacer {
  height: 5rem;
}

/* Hero Section */
.hero {
  padding: 4rem 1rem 2rem;
  text-align: center;
}

.hero-logo {
  width: 6rem;
  height: 6rem;
  margin: 0 auto 2rem;
  border-radius: 50%;
  box-shadow: 0 10px 30px rgba(96, 165, 250, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(34, 211, 238, 0.1);
  border: 2px solid var(--color-cyan-400);
}

body:not(.dark) .hero-logo {
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.2);
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--color-blue-500);
}

body:not(.dark) .hero-logo i {
  color: var(--color-blue-500) !important;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.hero-gradient {
  background: linear-gradient(
    to right,
    var(--color-blue-400),
    var(--color-cyan-400),
    var(--color-blue-400)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% auto;
  animation: gradient-shift 3s linear infinite;
}

@keyframes gradient-shift {
  to {
    background-position: 200% center;
  }
}

.hero-description {
  font-size: 1.25rem;
  color: var(--color-gray-300);
  max-width: 48rem;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

body:not(.dark) .hero-description {
  color: var(--color-gray-600);
}

.hero-features {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-gray-400);
}

body:not(.dark) .hero-feature {
  color: var(--color-gray-600);
}

/* Playground Section */
.playground {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--color-gray-700);
  border-radius: 1rem;
  padding: 2rem;
  margin: 2rem auto;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body:not(.dark) .playground {
  background: rgba(255, 255, 255, 0.5);
  border-color: var(--color-gray-200);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.playground-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.playground-title {
  font-size: 1.875rem;
  font-weight: 700;
  background: linear-gradient(
    to right,
    var(--color-blue-400),
    var(--color-cyan-400)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 5px;
}

.hub-hint {
  color: var(--color-gray-400);
  font-size: 0.875rem;
}

body:not(.dark) .hub-hint {
  color: var(--color-gray-600);
}

.hub-hint a {
  color: var(--color-cyan-400);
  text-decoration: none;
  font-weight: 500;
}

.hub-hint a:hover {
  text-decoration: underline;
}

body:not(.dark) .hub-hint a {
  color: var(--color-blue-600);
}

/* Alert Component (Unified for Errors and Success) */
.alert-container {
  display: none;
  border-radius: 1rem;
  margin-bottom: 1.5rem;
  overflow: hidden;
  animation: alertSlideIn 0.4s ease-out;
  transition: all 0.3s ease;
}

.alert-container.show {
  display: block;
}

/* Error State */
.alert-container.error {
  background: linear-gradient(
    135deg,
    rgba(239, 68, 68, 0.1),
    rgba(220, 38, 38, 0.05)
  );
  border: 2px solid rgba(239, 68, 68, 0.4);
  box-shadow: 0 8px 24px rgba(239, 68, 68, 0.2), 0 0 40px rgba(239, 68, 68, 0.1);
}

body:not(.dark) .alert-container.error {
  background: linear-gradient(
    135deg,
    rgba(239, 68, 68, 0.08),
    rgba(220, 38, 38, 0.03)
  );
  border-color: rgba(239, 68, 68, 0.3);
  box-shadow: 0 8px 24px rgba(239, 68, 68, 0.15),
    0 0 40px rgba(239, 68, 68, 0.08);
}

/* Success State */
.alert-container.success {
  background: linear-gradient(
    135deg,
    rgba(34, 197, 94, 0.1),
    rgba(22, 163, 74, 0.05)
  );
  border: 2px solid rgba(34, 197, 94, 0.4);
  box-shadow: 0 8px 24px rgba(34, 197, 94, 0.2), 0 0 40px rgba(34, 197, 94, 0.1);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
}

body:not(.dark) .alert-container.success {
  background: linear-gradient(
    135deg,
    rgba(34, 197, 94, 0.08),
    rgba(22, 163, 74, 0.03)
  );
  border-color: rgba(34, 197, 94, 0.3);
  box-shadow: 0 8px 24px rgba(34, 197, 94, 0.15),
    0 0 40px rgba(34, 197, 94, 0.08);
}

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

.alert-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1.5rem 0.75rem;
}

.alert-container.error .alert-header {
  background: rgba(239, 68, 68, 0.05);
  border-bottom: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-container.success .alert-header {
  background: transparent;
  border-bottom: none;
  padding: 0;
  gap: 0.625rem;
}

body:not(.dark) .alert-container.error .alert-header {
  background: rgba(239, 68, 68, 0.03);
}

body:not(.dark) .alert-container.success .alert-header {
  background: transparent;
}

.alert-icon {
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.75rem;
}

.alert-container.error .alert-icon {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  animation: errorPulse 2s ease-in-out infinite;
}

.alert-container.success .alert-icon {
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
  width: 1.75rem;
  height: 1.75rem;
}

@keyframes errorPulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(239, 68, 68, 0);
  }
}

.alert-title {
  flex: 1;
}

.alert-title h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0 0 0.25rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.alert-container.error .alert-title h3 {
  color: #ef4444;
}

.alert-container.success .alert-title h3 {
  color: #22c55e;
  font-size: 0.875rem;
  margin: 0;
}

.alert-subtitle {
  font-size: 0.875rem;
  color: var(--color-gray-400);
  margin: 0;
}

.alert-container.success .alert-subtitle {
  font-size: 0.75rem;
}

body:not(.dark) .alert-subtitle {
  color: var(--color-gray-600);
}

.alert-close {
  flex-shrink: 0;
  background: transparent;
  border: none;
  color: var(--color-gray-400);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 0.375rem;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.alert-container.error .alert-close:hover {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
}

.alert-container.success .alert-close:hover {
  background: rgba(34, 197, 94, 0.1);
  color: #22c55e;
}

.alert-body {
  padding: 1.25rem 1.5rem;
}

.alert-container.success .alert-body {
  display: none;
}

.alert-message {
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-x: auto;
}

.alert-container.error .alert-message {
  color: #fca5a5;
  background: rgba(15, 23, 42, 0.5);
  border-left: 4px solid #ef4444;
}

body:not(.dark) .alert-container.error .alert-message {
  color: #dc2626;
  background: rgba(254, 242, 242, 0.8);
}

.alert-help {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-gray-400);
  padding: 0.75rem;
  border-radius: 0.5rem;
}

.alert-container.error .alert-help {
  background: rgba(239, 68, 68, 0.05);
  border: 1px solid rgba(239, 68, 68, 0.15);
}

body:not(.dark) .alert-container.error .alert-help {
  color: var(--color-gray-600);
  background: rgba(239, 68, 68, 0.03);
}

.alert-help i {
  color: var(--color-cyan-400);
  flex-shrink: 0;
}

body:not(.dark) .alert-help i {
  color: var(--color-blue-500);
}

.alert-help a {
  color: var(--color-cyan-400);
  text-decoration: underline;
  font-weight: 500;
}

.alert-help a:hover {
  color: var(--color-cyan-300);
}

body:not(.dark) .alert-help a {
  color: var(--color-blue-600);
}

body:not(.dark) .alert-help a:hover {
  color: var(--color-blue-700);
}

/* Editor Player Container */
.editor-player {
  background: var(--color-gray-850);
  border: 1px solid var(--color-gray-700);
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

body:not(.dark) .editor-player {
  background: white;
  border-color: var(--color-gray-200);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.docs-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  background: var(--color-blue-500);
  color: white;
  text-decoration: none;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: all 0.2s;
}

.docs-link:hover {
  background: var(--color-blue-600);
  transform: translateY(-2px);
}

body:not(.dark) .docs-link {
  background: var(--color-blue-500);
  color: white;
}

body:not(.dark) .docs-link:hover {
  background: var(--color-blue-700);
  color: white;
}

/* Save Status Indicator */
.save-status {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  border-radius: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 500;
  margin-left: 1rem;
  transition: all 0.2s;
  opacity: 0;
  transform: translateY(-4px);
}

.save-status.saving {
  background: var(--color-blue-500);
  color: white;
  opacity: 1;
  transform: translateY(0);
}

.save-status.saving i {
  animation: spin 1s linear infinite;
}

.save-status.saved {
  background: var(--color-green-600);
  color: white;
  opacity: 1;
  transform: translateY(0);
}

.save-status.hidden {
  opacity: 0;
  transform: translateY(-4px);
}

body:not(.dark) .save-status.saving {
  background: var(--color-blue-600);
}

body:not(.dark) .save-status.saved {
  background: var(--color-green-700);
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Editor and History Container */
.editor-history-container {
  display: flex;
  gap: 1rem;
  background: transparent;
  align-items: flex-start;
}

.editor-section {
  flex: 1;
  min-width: 0;
}

/* Sequence History Panel */
.sequence-history-panel {
  width: 280px;
  background: var(--color-gray-850);
  border-radius: 0.5rem;
  border: 1px solid var(--color-gray-700);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
  height: 750px;
  max-height: 750px;
}

body:not(.dark) .sequence-history-panel {
  background: white;
  border-color: var(--color-gray-200);
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-gray-700);
  background: var(--color-gray-900);
}

body:not(.dark) .history-header {
  background: var(--color-gray-50);
  border-bottom-color: var(--color-gray-200);
}

.history-header h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-gray-100);
  margin: 0;
}

body:not(.dark) .history-header h3 {
  color: var(--color-gray-900);
}

.clear-history-btn {
  background: transparent;
  border: none;
  color: var(--color-gray-400);
  cursor: pointer;
  padding: 0.375rem;
  border-radius: 0.25rem;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.clear-history-btn:hover {
  background: var(--color-gray-800);
  color: var(--color-red-400);
}

body:not(.dark) .clear-history-btn:hover {
  background: var(--color-gray-100);
  color: var(--color-red-600);
}

.history-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  min-height: 0;
}

/* Scrollbar styling for history content - Dark mode */
.history-content::-webkit-scrollbar {
  width: 8px;
}

.history-content::-webkit-scrollbar-track {
  background: var(--color-gray-800);
  border-radius: 4px;
}

.history-content::-webkit-scrollbar-thumb {
  background: var(--color-gray-600);
  border-radius: 4px;
}

.history-content::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

/* Scrollbar styling for history content - Light mode */
body:not(.dark) .history-content::-webkit-scrollbar-track {
  background: var(--color-gray-100);
}

body:not(.dark) .history-content::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
}

body:not(.dark) .history-content::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

.history-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--color-gray-500);
}

.history-empty i {
  margin-bottom: 1rem;
  opacity: 0.5;
}

.history-empty p {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-gray-400);
  margin-bottom: 0.25rem;
}

.history-empty span {
  font-size: 0.8125rem;
  color: var(--color-gray-600);
}

body:not(.dark) .history-empty {
  color: var(--color-gray-400);
}

body:not(.dark) .history-empty p {
  color: var(--color-gray-600);
}

.history-list {
  display: none;
  padding: 0.5rem;
}

.history-item {
  padding: 0.75rem;
  border-radius: 0.375rem;
  background: var(--color-gray-800);
  border: 1px solid var(--color-gray-700);
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
}

.history-item:last-child {
  margin-bottom: 0;
}

.history-item:hover {
  background: var(--color-gray-750);
  border-color: var(--color-blue-500);
  transform: translateX(2px);
}

body:not(.dark) .history-item {
  background: var(--color-gray-50);
  border-color: var(--color-gray-200);
}

body:not(.dark) .history-item:hover {
  background: var(--color-gray-100);
  border-color: var(--color-blue-500);
}

.history-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.375rem;
}

.history-item-name {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-gray-200);
  font-family: "Monaco", "Menlo", monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

body:not(.dark) .history-item-name {
  color: var(--color-gray-800);
}

.history-item-delete {
  background: transparent;
  border: none;
  color: var(--color-gray-500);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 0.25rem;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
}

.history-item:hover .history-item-delete {
  opacity: 1;
}

.history-item-delete:hover {
  background: var(--color-red-500);
  color: white;
}

.history-item-time {
  font-size: 0.75rem;
  color: var(--color-gray-500);
}

body:not(.dark) .history-item-time {
  color: var(--color-gray-600);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .sequence-history-panel {
    width: 240px;
  }
}

@media (max-width: 768px) {
  .editor-history-container {
    flex-direction: column;
    width: 100%;
  }

  .sequence-history-panel {
    width: 100%;
    max-height: 300px;
    order: 2;
  }

  .editor-section {
    order: 1;
    width: 100%;
  }

  .save-status {
    margin-left: 0;
    margin-top: 0.5rem;
  }
}

.editor-container {
  display: flex;
  gap: 0;
  background: var(--color-gray-900);
  transition: opacity 0.2s;
  position: relative;
}

.editor-container:has(.editor-textarea:disabled) {
  opacity: 0.7;
}

body:not(.dark) .editor-container {
  background: var(--color-gray-50);
}

.editor-wrapper {
  flex: 1;
  position: relative;
  display: flex;
  overflow: hidden; /* Contain the balloon */
}

.syntax-highlight {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1rem;
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  white-space: pre;
  word-wrap: normal;
  overflow-wrap: normal;
  pointer-events: none;
  overflow: auto;
  height: 750px;
  max-height: 750px;
  color: var(--color-gray-300);
}

body:not(.dark) .syntax-highlight {
  color: var(--color-gray-700);
}

/* Ensure syntax spans don't affect layout */
.syntax-highlight span {
  display: inline;
  line-height: inherit;
  font-size: inherit;
  margin: 0;
  padding: 0;
  font-family: inherit;
  letter-spacing: inherit;
}

/* Syntax highlighting colors */
.syntax-comment {
  color: #6a9955;
}

/* Autocomplete balloon */
.autocomplete-balloon {
  position: absolute;
  background: var(--color-gray-800);
  border: 1px solid var(--color-gray-700);
  border-radius: 0.5rem;
  padding: 0.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3),
    0 2px 4px -1px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  display: none;
  max-width: 320px;
  min-width: 200px;
}

/* Hide balloon on mobile devices */
@media (max-width: 768px) {
  .autocomplete-balloon {
    display: none !important;
  }
}

.autocomplete-balloon.show {
  display: block;
}

.autocomplete-options {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
  max-height: 200px;
  overflow-y: auto;
}

.autocomplete-option {
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.875rem;
  color: var(--color-gray-300);
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background-color 0.15s;
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.autocomplete-keyword {
  font-weight: 600;
  min-width: 5rem;
}

.autocomplete-desc {
  font-size: 0.75rem;
  color: var(--color-gray-500);
  opacity: 0.8;
}

.autocomplete-option:hover {
  background: var(--color-gray-700);
}

.autocomplete-option.selected {
  background: var(--color-blue-600);
  color: white;
}

.autocomplete-option.selected .autocomplete-desc {
  color: rgba(255, 255, 255, 0.8);
}

.autocomplete-error {
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.875rem;
  color: var(--color-red-400);
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--color-red-500);
  display: flex;
  align-items: center;
}

.autocomplete-hint {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.7rem;
  color: var(--color-gray-500);
  padding: 0 0.25rem;
  flex-wrap: wrap;
}

/* Mobile Autocomplete Bar */
.mobile-autocomplete-bar {
  display: none;
  background: var(--color-gray-850);
  border-top: 1px solid var(--color-gray-700);
  padding: 0.75rem;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  position: sticky;
  bottom: 0;
  z-index: 10;
}

body:not(.dark) .mobile-autocomplete-bar {
  background: var(--color-gray-50);
  border-top-color: var(--color-gray-300);
}

.mobile-autocomplete-bar.show {
  display: block;
}

.mobile-autocomplete-chips {
  display: flex;
  gap: 0.5rem;
  min-width: min-content;
}

.mobile-autocomplete-chip {
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.875rem;
  color: var(--color-gray-100);
  background: var(--color-gray-700);
  padding: 0.5rem 1rem;
  border-radius: 1.5rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
  flex-shrink: 0;
  border: 1px solid var(--color-gray-600);
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

body:not(.dark) .mobile-autocomplete-chip {
  background: white;
  color: var(--color-gray-900);
  border-color: var(--color-gray-300);
}

.mobile-autocomplete-chip:active {
  background: var(--color-cyan-600);
  border-color: var(--color-cyan-500);
  color: white;
  transform: scale(0.95);
}

body:not(.dark) .mobile-autocomplete-chip:active {
  background: var(--color-blue-500);
  border-color: var(--color-blue-600);
  color: white;
}

.mobile-autocomplete-chip-keyword {
  font-weight: 600;
  font-size: 0.875rem;
}

.mobile-autocomplete-chip-desc {
  font-size: 0.7rem;
  opacity: 0.7;
}

.autocomplete-hint kbd {
  background: var(--color-gray-700);
  border: 1px solid var(--color-gray-600);
  border-radius: 0.25rem;
  padding: 0.125rem 0.375rem;
  font-family: inherit;
  font-size: 0.7rem;
  color: var(--color-gray-300);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  min-width: 1.5rem;
  text-align: center;
}

body:not(.dark) .autocomplete-balloon {
  background: white;
  border-color: var(--color-gray-300);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

body:not(.dark) .autocomplete-option {
  color: var(--color-gray-700);
}

body:not(.dark) .autocomplete-option:hover {
  background: var(--color-gray-100);
}

body:not(.dark) .autocomplete-option.selected {
  background: var(--color-blue-500);
  color: white;
}

body:not(.dark) .autocomplete-option.selected .autocomplete-desc {
  color: rgba(255, 255, 255, 0.85);
}

body:not(.dark) .autocomplete-desc {
  color: var(--color-gray-500);
}

body:not(.dark) .autocomplete-error {
  color: var(--color-red-600);
  background: rgba(239, 68, 68, 0.08);
  border-color: var(--color-red-400);
}

body:not(.dark) .autocomplete-hint {
  color: var(--color-gray-600);
}

body:not(.dark) .autocomplete-hint kbd {
  background: var(--color-gray-100);
  border-color: var(--color-gray-300);
  color: var(--color-gray-700);
}

.syntax-directive {
  color: #c586c0;
  font-weight: 600;
}
.syntax-keyword {
  color: #569cd6;
  font-weight: 500;
}
.syntax-type {
  color: #4ec9b0;
}
.syntax-waveform {
  color: #9cdcfe;
}
.syntax-time {
  color: #b5cea8;
}
.syntax-number {
  color: #b5cea8;
}
.syntax-preset {
  color: #dcdcaa;
  font-weight: 500;
}
.syntax-timeline-preset {
  color: #ce9178;
}
.syntax-text {
  color: #d4d4d4;
}
.syntax-ramp {
  color: #ce9178;
  font-weight: 500;
  font-style: italic;
}
.syntax-template {
  color: #c586c0;
  font-weight: 600;
}

/* Error line highlighting */
.error-line {
  display: block;
  background: rgba(255, 0, 0, 0.1);
  border-left: 3px solid var(--color-red-500);
  margin-left: -0.5rem;
  padding-left: calc(0.5rem - 3px);
}

body:not(.dark) .error-line {
  background: rgba(255, 0, 0, 0.08);
  border-left-color: #dc2626;
}

/* Active preset highlighting during playback */
.active-preset-line {
  display: block;
  background: rgba(59, 130, 246, 0.15);
  border-left: 3px solid var(--color-blue-500);
  margin-left: -0.5rem;
  padding-left: calc(0.5rem - 3px);
}

body:not(.dark) .active-preset-line {
  background: rgba(59, 130, 246, 0.12);
  border-left-color: #3b82f6;
}

body:not(.dark) .syntax-comment {
  color: #008000;
}
body:not(.dark) .syntax-directive {
  color: #af00db;
}
body:not(.dark) .syntax-keyword {
  color: #0000ff;
}
body:not(.dark) .syntax-type {
  color: #267f99;
}
body:not(.dark) .syntax-waveform {
  color: #001080;
}
body:not(.dark) .syntax-time {
  color: #098658;
}
body:not(.dark) .syntax-number {
  color: #098658;
}
body:not(.dark) .syntax-preset {
  color: #795e26;
}
body:not(.dark) .syntax-ramp {
  color: #a31515;
  font-weight: 500;
  font-style: italic;
}
body:not(.dark) .syntax-template {
  color: #af00db;
  font-weight: 600;
}

.line-numbers {
  background: var(--color-gray-800);
  padding: 1rem 0.75rem;
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.875rem;
  color: var(--color-gray-500);
  user-select: none;
  line-height: 1.5;
  min-width: 3.5rem;
  text-align: right;
  overflow: hidden;
  white-space: pre;
  height: 750px;
  max-height: 750px;
}

body:not(.dark) .line-numbers {
  background: var(--color-gray-50);
  color: var(--color-gray-400);
}

.editor-textarea {
  flex: 1;
  padding: 1rem;
  background: transparent;
  border: none;
  color: var(--color-gray-100);
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.875rem;
  resize: none;
  outline: none;
  line-height: 1.5;
  overflow: auto;
  height: 750px;
  max-height: 750px;
  width: 100%;
  transition: opacity 0.2s, filter 0.2s;
  position: relative;
  z-index: 2;
  color: transparent;
  caret-color: var(--color-gray-100);
  white-space: pre;
  word-wrap: normal;
  overflow-wrap: normal;
}

.editor-textarea:disabled {
  cursor: not-allowed;
  opacity: 0.9;
}

body:not(.dark) .editor-textarea {
  caret-color: var(--color-gray-900);
}

.editor-textarea::placeholder {
  color: var(--color-gray-600);
}

body:not(.dark) .editor-textarea::placeholder {
  color: var(--color-gray-400);
}

/* Hide scrollbars from syntax highlight overlay */
.syntax-highlight::-webkit-scrollbar {
  display: none;
}

.syntax-highlight {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

/* Scrollbar styling for editor textarea - Dark mode */
.dark .editor-textarea::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

.dark .editor-textarea::-webkit-scrollbar-track {
  background: var(--color-gray-800);
  border-radius: 0;
}

.dark .editor-textarea::-webkit-scrollbar-thumb {
  background: var(--color-gray-600);
  border-radius: 6px;
  border: 2px solid var(--color-gray-800);
}

.dark .editor-textarea::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

/* Scrollbar styling for editor textarea - Light mode */
body:not(.dark) .editor-textarea::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

body:not(.dark) .editor-textarea::-webkit-scrollbar-track {
  background: var(--color-gray-100);
  border-radius: 0;
}

body:not(.dark) .editor-textarea::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: 6px;
  border: 2px solid var(--color-gray-100);
}

body:not(.dark) .editor-textarea::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

/* Player Controls Section */
.player-controls-section {
  background: var(--color-gray-800);
  border-top: 1px solid var(--color-gray-700);
  padding: 1.25rem 1.5rem;
}

body:not(.dark) .player-controls-section {
  background: var(--color-gray-100);
  border-top-color: var(--color-gray-200);
}

/* Player Progress */
.player-progress {
  margin-bottom: 1rem;
}

.progress-bar-container {
  width: 100%;
  height: 6px;
  background: var(--color-gray-700);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: height 0.2s;
}

.progress-bar-container:hover {
  height: 8px;
}

body:not(.dark) .progress-bar-container {
  background: var(--color-gray-300);
}

.progress-bar {
  height: 100%;
  background: linear-gradient(
    to right,
    var(--color-blue-500),
    var(--color-cyan-500)
  );
  width: 0%;
  transition: width 0.1s;
  box-shadow: 0 0 10px rgba(34, 211, 238, 0.5);
}

.progress-time-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: "Monaco", "Menlo", monospace;
  font-size: 0.875rem;
  color: var(--color-gray-400);
  font-weight: 500;
}

body:not(.dark) .progress-time-display {
  color: var(--color-gray-600);
}

.time-current {
  color: var(--color-cyan-400);
  font-weight: 600;
}

body:not(.dark) .time-current {
  color: var(--color-blue-600);
}

.time-separator {
  color: var(--color-gray-600);
}

.time-total {
  color: var(--color-gray-500);
}

/* Player Controls */
.player-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.controls-left,
.controls-right {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.btn-control {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem;
  border: 1px solid var(--color-gray-700);
  border-radius: 0.75rem;
  background: var(--color-gray-900);
  color: var(--color-gray-300);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.875rem;
  font-weight: 600;
}

body:not(.dark) .btn-control {
  background: white;
  border-color: var(--color-gray-300);
  color: var(--color-gray-700);
}

.btn-control:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-control:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-control-play {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: white;
  border-color: transparent;
  padding: 0.875rem 1.25rem;
}

.btn-control-play:not(:disabled):hover {
  background: linear-gradient(135deg, #16a34a, #15803d);
  box-shadow: 0 4px 16px rgba(34, 197, 94, 0.3);
}

.btn-control-stop {
  width: 3rem;
}

.btn-control-stop:not(:disabled):hover {
  background: var(--color-gray-700);
  border-color: var(--color-gray-600);
}

body:not(.dark) .btn-control-stop:not(:disabled):hover {
  background: var(--color-gray-100);
  border-color: var(--color-gray-400);
}

.btn-control-upload {
  background: var(--color-blue-600);
  color: white;
  border-color: transparent;
  position: relative;
}

.btn-control-upload:hover {
  background: var(--color-blue-700);
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

.btn-label {
  display: none;
}

.menu-chevron {
  margin-left: 0.25rem;
  opacity: 0.7;
  transition: transform 0.2s;
}

.btn-control-upload.menu-open .menu-chevron {
  transform: rotate(180deg);
}

/* File Menu Dropdown */
.file-menu-container {
  position: relative;
  flex: 1;
}

.file-menu {
  position: absolute;
  bottom: calc(100% + 0.5rem);
  left: 0;
  right: 0;
  background: var(--color-gray-800);
  border: 1px solid var(--color-gray-700);
  border-radius: 0.5rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transform: translateY(0.5rem);
  transition: all 0.2s;
  z-index: 1000;
  overflow: hidden;
}

body:not(.dark) .file-menu {
  background: white;
  border-color: var(--color-gray-300);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.file-menu.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.file-menu-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  color: var(--color-gray-300);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
}

body:not(.dark) .file-menu-item {
  color: var(--color-gray-700);
}

.file-menu-item:hover {
  background: var(--color-gray-700);
  color: white;
}

body:not(.dark) .file-menu-item:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-900);
}

.file-menu-item i {
  color: var(--color-cyan-400);
  flex-shrink: 0;
}

body:not(.dark) .file-menu-item i {
  color: var(--color-blue-600);
}

@media (min-width: 640px) {
  .btn-label {
    display: inline;
  }

  .btn-control-upload {
    padding: 0.75rem 1.25rem;
  }

  .file-menu-container {
    flex: initial;
  }

  .file-menu {
    left: auto;
    right: 0;
    min-width: 12rem;
  }
}

/* Player Status */
.player-status {
  text-align: center;
  color: var(--color-gray-500);
  font-size: 0.875rem;
  padding: 0.75rem;
  background: var(--color-gray-900);
  border-radius: 0.5rem;
  border: 1px solid var(--color-gray-700);
  font-weight: 500;
}

body:not(.dark) .player-status {
  color: var(--color-gray-600);
  background: white;
  border-color: var(--color-gray-200);
}

.file-input-hidden {
  display: none;
}

/* Hub Section */
.hub-section {
  text-align: center;
  padding: 3rem 1rem;
}

.hub-card {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--color-gray-800);
  border-radius: 1rem;
  padding: 3rem 2rem;
  max-width: 48rem;
  margin: 0 auto;
  transition: all 0.2s;
}

.hub-card:hover {
  border-color: var(--color-cyan-600);
  transform: translateY(-4px);
  box-shadow: 0 10px 15px rgba(34, 211, 238, 0.1);
}

.hub-icon {
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1.5rem;
  color: var(--color-cyan-400);
}

.hub-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(
    to right,
    var(--color-blue-400),
    var(--color-cyan-400)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hub-description {
  color: var(--color-gray-300);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hub-button {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  background: linear-gradient(
    135deg,
    var(--color-blue-500),
    var(--color-cyan-500)
  );
  color: white;
  text-decoration: none;
  border-radius: 0.75rem;
  font-weight: 600;
  font-size: 1.125rem;
  transition: all 0.2s;
}

.hub-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 10px rgba(59, 130, 246, 0.3);
}

/* Installation Section */
.installation {
  padding: 3rem 1rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 3rem;
  background: linear-gradient(
    to right,
    var(--color-blue-400),
    var(--color-cyan-400)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.install-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.install-card {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--color-gray-700);
  border-radius: 1rem;
  padding: 2rem;
  transition: all 0.2s;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body:not(.dark) .install-card {
  background: rgba(255, 255, 255, 0.5);
  border-color: var(--color-gray-200);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.install-card:hover {
  border-color: var(--color-blue-600);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.1);
}

.install-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.install-icon {
  width: 2.5rem;
  height: 2.5rem;
  color: var(--color-blue-400);
}

.install-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: white;
}

.install-code {
  background: var(--color-gray-900);
  border: 1px solid var(--color-gray-700);
  border-radius: 0.5rem;
  padding: 1rem;
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.875rem;
  color: var(--color-blue-300);
  overflow-x: auto;
  margin-bottom: 0.5rem;
}

body:not(.dark) .install-code {
  background: var(--color-gray-50);
  border-color: var(--color-gray-200);
  color: var(--color-blue-700);
}

.install-code:last-child {
  margin-bottom: 0;
}

.downloads-section {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--color-gray-700);
  border-radius: 1rem;
  padding: 2rem;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body:not(.dark) .downloads-section {
  background: rgba(255, 255, 255, 0.5);
  border-color: var(--color-gray-200);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.downloads-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
  color: white;
}

.downloads-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.download-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: linear-gradient(
    135deg,
    var(--color-blue-500),
    var(--color-blue-600)
  );
  color: white;
  text-decoration: none;
  border-radius: 0.75rem;
  font-weight: 600;
  transition: all 0.2s;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(59, 130, 246, 0.2);
}

/* Footer */
footer {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--color-gray-400);
  border-top: 1px solid var(--color-gray-800);
}

body:not(.dark) footer {
  color: var(--color-gray-600);
  border-top-color: var(--color-gray-200);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--color-cyan-400);
}

body:not(.dark) .footer-links a {
  color: var(--color-gray-600);
}

body:not(.dark) .footer-links a:hover {
  color: var(--color-blue-600);
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-overlay.show {
  display: flex;
}

.loading-content {
  text-align: center;
  color: white;
}

.loading-coffee-container {
  position: relative;
  display: inline-block;
  margin-bottom: 2.5rem;
}

.loading-coffee {
  width: 5rem;
  height: 5rem;
  color: var(--color-cyan-400);
  animation: coffeePulse 2s ease-in-out infinite;
  filter: drop-shadow(0 0 25px rgba(34, 211, 238, 0.5));
}

@keyframes coffeePulse {
  0%,
  100% {
    transform: scale(1);
    filter: drop-shadow(0 0 25px rgba(34, 211, 238, 0.5));
  }
  50% {
    transform: scale(1.08);
    filter: drop-shadow(0 0 35px rgba(34, 211, 238, 0.7));
  }
}

.loading-steam {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
}

.loading-steam span {
  width: 4px;
  height: 20px;
  background: linear-gradient(
    to top,
    rgba(34, 211, 238, 0.8),
    rgba(34, 211, 238, 0.2),
    transparent
  );
  border-radius: 50%;
  animation: steamRise 2s ease-in-out infinite;
  opacity: 0;
}

.loading-steam span:nth-child(1) {
  animation-delay: 0s;
}

.loading-steam span:nth-child(2) {
  animation-delay: 0.4s;
}

.loading-steam span:nth-child(3) {
  animation-delay: 0.8s;
}

@keyframes steamRise {
  0% {
    transform: translateY(0) scaleY(0.5);
    opacity: 0;
  }
  20% {
    opacity: 0.8;
  }
  50% {
    transform: translateY(-25px) scaleY(1.2);
    opacity: 0.6;
  }
  80% {
    opacity: 0.3;
  }
  100% {
    transform: translateY(-40px) scaleY(0.8);
    opacity: 0;
  }
}

.loading-text {
  font-size: 1.75rem;
  font-weight: 700;
  color: white;
  margin-bottom: 0.75rem;
  background: linear-gradient(
    135deg,
    var(--color-blue-400),
    var(--color-cyan-400),
    var(--color-blue-500)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.loading-subtext {
  font-size: 1rem;
  color: var(--color-gray-300);
  font-weight: 400;
  letter-spacing: 0.5px;
  animation: subtextPulse 3s ease-in-out infinite;
}

@keyframes subtextPulse {
  0%,
  100% {
    opacity: 0.7;
    transform: translateY(0);
  }
  50% {
    opacity: 1;
    transform: translateY(-2px);
  }
}

/* Spotlight Overlay */
.spotlight-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9998;
  display: none;
  pointer-events: none;
}

.spotlight-overlay.show {
  display: block;
  pointer-events: all;
}

.spotlight-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.spotlight-content {
  position: relative;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  pointer-events: none;
}

.spotlight-close {
  position: absolute;
  top: 2rem;
  right: 2rem;
  z-index: 10000;
  background: rgba(15, 23, 42, 0.8);
  border: 2px solid var(--color-gray-700);
  color: var(--color-gray-300);
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s;
  pointer-events: all;
  backdrop-filter: blur(8px);
}

body:not(.dark) .spotlight-close {
  background: rgba(255, 255, 255, 0.9);
  border-color: var(--color-gray-300);
  color: var(--color-gray-600);
}

.spotlight-close:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
  color: #ef4444;
  transform: rotate(90deg);
}

body:not(.dark) .spotlight-close:hover {
  background: rgba(239, 68, 68, 0.15);
}

.spotlight-message {
  text-align: center;
  color: white;
  background: rgba(15, 23, 42, 0.95);
  border: 2px solid var(--color-cyan-400);
  border-radius: 1.5rem;
  padding: 3rem 2.5rem;
  backdrop-filter: blur(12px);
  box-shadow: 0 0 60px rgba(34, 211, 238, 0.3),
    0 0 100px rgba(34, 211, 238, 0.2);
  animation: spotlightPulse 0.6s ease-out;
  pointer-events: all;
  max-width: 500px;
}

body:not(.dark) .spotlight-message {
  color: var(--color-gray-900);
  background: rgba(255, 255, 255, 0.95);
  border-color: var(--color-blue-500);
  box-shadow: 0 0 60px rgba(59, 130, 246, 0.3),
    0 0 100px rgba(59, 130, 246, 0.2);
}
@keyframes spotlightPulse {
  0% {
    opacity: 0;
    transform: scale(0.9);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.spotlight-message > i {
  color: var(--color-cyan-400);
  margin-bottom: 1.5rem;
  animation: sparkle 2s ease-in-out infinite;
}

body:not(.dark) .spotlight-message > i {
  color: var(--color-blue-500);
}

@keyframes sparkle {
  0%,
  100% {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.15) rotate(180deg);
  }
}

.spotlight-message h3 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  background: linear-gradient(
    to right,
    var(--color-blue-400),
    var(--color-cyan-400)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

body:not(.dark) .spotlight-message h3 {
  background: linear-gradient(
    to right,
    var(--color-blue-600),
    var(--color-blue-500)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.spotlight-sequence-name {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-cyan-400);
  margin-bottom: 1rem;
  padding: 0.5rem 1rem;
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.3);
  border-radius: 0.5rem;
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  letter-spacing: 0.5px;
  display: inline-block;
}

body:not(.dark) .spotlight-sequence-name {
  color: var(--color-blue-600);
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.3);
}

.spotlight-message p {
  font-size: 1.125rem;
  color: var(--color-gray-300);
  margin-bottom: 2rem;
  line-height: 1.6;
}

body:not(.dark) .spotlight-message p {
  color: var(--color-gray-600);
}

.spotlight-play-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: white;
  border: none;
  border-radius: 0.75rem;
  font-size: 1.125rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: 0 0 30px rgba(34, 197, 94, 0.4), 0 4px 15px rgba(0, 0, 0, 0.2);
  animation: playPulse 2s ease-in-out infinite;
}

@keyframes playPulse {
  0%,
  100% {
    box-shadow: 0 0 30px rgba(34, 197, 94, 0.4), 0 4px 15px rgba(0, 0, 0, 0.2);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 50px rgba(34, 197, 94, 0.6), 0 6px 20px rgba(0, 0, 0, 0.3);
    transform: scale(1.05);
  }
}

.spotlight-play-btn:hover {
  background: linear-gradient(135deg, #16a34a, #15803d);
  transform: scale(1.1) !important;
  box-shadow: 0 0 60px rgba(34, 197, 94, 0.7), 0 8px 25px rgba(0, 0, 0, 0.3) !important;
}

.spotlight-play-btn:active {
  transform: scale(1.05) !important;
}

/* Responsive */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 5rem;
    left: 1rem;
    right: 1rem;
    background: var(--color-gray-800);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 1.5rem;
    gap: 0.5rem;
    border: 1px solid var(--color-gray-700);
    border-radius: 0.75rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    transform: translateY(-1rem);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    z-index: 1000;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: all;
  }

  body:not(.dark) .nav-links {
    background: white;
    border-color: var(--color-gray-300);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  }

  .nav-links a {
    font-size: 1rem;
    padding: 0.875rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .nav-links a:hover {
    background: var(--color-gray-700);
    color: var(--color-cyan-400);
  }

  body:not(.dark) .nav-links a:hover {
    background: var(--color-gray-100);
    color: var(--color-blue-600);
  }

  .theme-toggle {
    margin-top: 0.5rem;
    width: 100%;
    height: 3rem;
    border-radius: 0.5rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .hero-features {
    flex-direction: column;
    gap: 0.75rem;
  }

  .playground {
    padding: 1rem;
  }

  .playground-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .controls {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .line-numbers {
    /* Adjust width for smaller screens */
    min-width: 2.5rem;
    height: 600px;
    max-height: 600px;
  }

  .editor-container {
    min-height: 600px;
    width: 100%;
  }

  .editor-wrapper {
    flex: 1;
    height: 600px;
    max-height: 600px;
    max-width: 100%;
  }

  .editor-textarea {
    height: 600px;
    max-height: 600px;
    width: 100%;
  }

  .syntax-highlight {
    height: 600px;
    max-height: 600px;
    width: 100%;
  }

  .player-controls {
    flex-direction: column;
    gap: 0.75rem;
  }

  .controls-left,
  .controls-right {
    width: 100%;
    justify-content: center;
  }

  .btn-control-play {
    flex: 1;
    justify-content: center;
    padding: 0.875rem 1rem;
  }

  .btn-label {
    display: inline;
  }

  .btn-control-upload {
    width: 100%;
    justify-content: center;
    padding: 0.875rem 1rem;
  }

  .menu-chevron {
    margin-left: 0.375rem;
  }

  .spotlight-close {
    top: 1rem;
    right: 1rem;
    width: 2.5rem;
    height: 2.5rem;
  }

  .spotlight-message {
    padding: 2rem 1.5rem;
    margin: 0 1rem;
    max-width: calc(100% - 2rem);
  }

  .spotlight-message > i {
    width: 2rem !important;
    height: 2rem !important;
  }

  .spotlight-message h3 {
    font-size: 1.75rem;
  }

  .spotlight-message p {
    font-size: 1rem;
  }

  .spotlight-play-btn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
  }
}

/* Playback Overlay */
.playback-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10000;
  display: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.playback-overlay.show {
  display: block;
  opacity: 1;
}

.playback-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.98);
}

body:not(.dark) .playback-backdrop {
  background: rgba(255, 255, 255, 0.98);
}

.playback-content {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  padding: 2rem;
}

/* Animated Wave Icon */
.playback-animation {
  position: relative;
  width: 12rem;
  height: 12rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.playback-wave-icon {
  width: 6rem !important;
  height: 6rem !important;
  color: var(--color-cyan-400);
  z-index: 2;
  animation: wavePulse 2s ease-in-out infinite;
  --wave-scale: 1.1;
}

body:not(.dark) .playback-wave-icon {
  color: var(--color-blue-500);
}

@keyframes wavePulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(var(--wave-scale, 1.1));
    opacity: 0.7;
  }
}

/* Animated Rings */
.playback-rings {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
}

.playback-rings span {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 2px solid var(--color-cyan-400);
  opacity: 0;
  animation: ringExpand 3s ease-out infinite;
}

body:not(.dark) .playback-rings span {
  border-color: var(--color-blue-500);
}

.playback-rings span:nth-child(1) {
  animation-delay: 0s;
}

.playback-rings span:nth-child(2) {
  animation-delay: 1s;
}

.playback-rings span:nth-child(3) {
  animation-delay: 2s;
}

@keyframes ringExpand {
  0% {
    width: 6rem;
    height: 6rem;
    opacity: 0.8;
  }
  100% {
    width: 12rem;
    height: 12rem;
    opacity: 0;
  }
}

/* Current Preset Display */
.playback-preset {
  text-align: center;
  max-width: 90%;
}

.playback-preset-label {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gray-400);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

body:not(.dark) .playback-preset-label {
  color: var(--color-gray-600);
}

.playback-preset-name {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-cyan-400);
  text-shadow: 0 0 20px rgba(34, 211, 238, 0.3);
}

body:not(.dark) .playback-preset-name {
  color: var(--color-blue-600);
  text-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

/* Progress Bar */
.playback-progress {
  width: 100%;
  max-width: 500px;
}

.playback-progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 1rem;
}

body:not(.dark) .playback-progress-bar {
  background: rgba(0, 0, 0, 0.1);
}

.playback-progress-fill {
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--color-cyan-500),
    var(--color-blue-500)
  );
  border-radius: 4px;
  width: 0%;
  transition: width 0.1s linear;
  box-shadow: 0 0 10px rgba(34, 211, 238, 0.5);
}

body:not(.dark) .playback-progress-fill {
  background: linear-gradient(
    90deg,
    var(--color-blue-500),
    var(--color-cyan-500)
  );
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

.playback-time {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-gray-300);
}

body:not(.dark) .playback-time {
  color: var(--color-gray-700);
}

.playback-time-current {
  color: var(--color-cyan-400);
}

body:not(.dark) .playback-time-current {
  color: var(--color-blue-600);
}

.playback-time-separator {
  color: var(--color-gray-500);
}

.playback-time-total {
  color: var(--color-gray-400);
}

body:not(.dark) .playback-time-total {
  color: var(--color-gray-600);
}

/* Stop Button */
.playback-stop-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.5rem;
  font-size: 1.125rem;
  font-weight: 600;
  color: white;
  background: rgba(239, 68, 68, 0.9);
  border: none;
  border-radius: 3rem;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.playback-stop-btn:hover {
  background: rgba(220, 38, 38, 1);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(239, 68, 68, 0.4);
}

.playback-stop-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

body:not(.dark) .playback-stop-btn {
  background: rgba(239, 68, 68, 1);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.25);
}

body:not(.dark) .playback-stop-btn:hover {
  background: rgba(220, 38, 38, 1);
  box-shadow: 0 6px 16px rgba(239, 68, 68, 0.35);
}

/* Responsive */
@media (max-width: 768px) {
  .playback-animation {
    width: 10rem;
    height: 10rem;
  }

  .playback-wave-icon {
    width: 5rem !important;
    height: 5rem !important;
  }

  .playback-rings span {
    border-width: 1.5px;
  }

  @keyframes ringExpand {
    0% {
      width: 5rem;
      height: 5rem;
      opacity: 0.8;
    }
    100% {
      width: 10rem;
      height: 10rem;
      opacity: 0;
    }
  }

  .playback-preset-name {
    font-size: 1.5rem;
  }

  .playback-progress {
    max-width: 100%;
  }

  .playback-stop-btn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
  }
}