:root {
  --bg-color: #121212;
  --surface-color: #1e1e1e;
  --surface-hover: #2d2d2d;
  --primary-color: #bb86fc;
  --primary-variant: #3700b3;
  --secondary-color: #03dac6;
  --text-color: #e0e0e0;
  --text-muted: #a0a0a0;
  --border-color: #333;
  --danger-color: #cf6679;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */
header {
  background-color: var(--surface-color);
  padding: var(--spacing-sm) var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  z-index: 10;
}

h1 {
  font-size: 1.25rem;
  margin: 0;
  font-weight: 600;
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
}

/* Main Layout */
main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar Tools */
.sidebar {
  width: 260px;
  background-color: var(--surface-color);
  border-right: 1px solid var(--border-color);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  overflow-y: auto;
}

.tool-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.tool-group h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 var(--spacing-xs) 0;
  letter-spacing: 0.05em;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

/* Inputs & Buttons */
button {
  background-color: var(--surface-hover);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

button:hover {
  background-color: var(--primary-variant);
  border-color: var(--primary-color);
  color: white;
}

button.primary {
  background-color: var(--primary-color);
  color: #000;
  font-weight: 600;
  border: none;
}

button.primary:hover {
  filter: brightness(1.1);
}

button.danger {
  color: var(--danger-color);
  border-color: var(--danger-color);
  background: transparent;
}

button.danger:hover {
  background: var(--danger-color);
  color: white;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--primary-color);
}

input[type="color"] {
  background: none;
  border: none;
  width: 30px;
  height: 30px;
  cursor: pointer;
  padding: 0;
}

select {
  background-color: var(--bg-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  padding: 6px;
  border-radius: var(--radius-sm);
  width: 100%;
}

/* Canvas Area */
.canvas-container {
  flex: 1;
  background-color: #0a0a0a;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  background-image:
    linear-gradient(45deg, #151515 25%, transparent 25%),
    linear-gradient(-45deg, #151515 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #151515 75%),
    linear-gradient(-45deg, transparent 75%, #151515 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

canvas {
  background: white;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
  max-width: 95%;
  max-height: 95%;
  border-radius: 2px;
  touch-action: none;
  /* Prevents scroll/zoom on touch devices */
}

/* Timeline */
.timeline-container {
  height: 140px;
  background-color: var(--surface-color);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.timeline-controls {
  padding: var(--spacing-xs) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  background: var(--surface-hover);
}

.frames-track {
  display: flex;
  padding: var(--spacing-sm);
  gap: var(--spacing-sm);
  overflow-x: auto;
  align-items: center;
  height: 100%;
}

.frame-thumb {
  width: 80px;
  height: 60px;
  background: white;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
  position: relative;
  transition: transform 0.1s;
  overflow: hidden;
}

.frame-thumb:hover {
  transform: translateY(-2px);
  border-color: var(--text-muted);
}

.frame-thumb.selected {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(187, 134, 252, 0.3);
}

.frame-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
}

.frame-number {
  position: absolute;
  top: 2px;
  left: 2px;
  font-size: 10px;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 1px 4px;
  border-radius: 2px;
}

/* Utilities */
.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}
/* Toast Notification */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 320px;
    background: rgba(30, 30, 40, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    z-index: 1000;
    transition: transform 0.3s ease, opacity 0.3s ease;
    overflow: hidden;
    animation: slideIn 0.5s ease-out;
}

.toast.hidden {
    transform: translateY(20px);
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

.toast-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.toast-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
}

.toast-body {
    padding: 16px;
}

.toast-body ul {
    list-style: none;
    padding: 0;
    margin: 0 0 16px 0;
}

.toast-body li {
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
    color: var(--text-color);
    font-size: 0.95rem;
}

.toast-body li::before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
    top: 0;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    padding: 0;
}

.close-btn:hover {
    color: var(--text-color);
}

.full-width {
    width: 100%;
}

@keyframes slideIn {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}