/* ===== CSS Variables ===== */
:root {
  --bg: #f8f9fa;
  --surface: #ffffff;
  --surface2: #e9ecef;
  --text: #212529;
  --text-dim: #6c757d;
  --accent: #4361ee;
  --accent2: #3a0ca3;
  --border: #dee2e6;
  --radius: 8px;
  --font-mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* ===== Header ===== */
.header {
  text-align: center;
  padding: 2rem 1rem 1rem;
}

.header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #7209b7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* ===== Main ===== */
.main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

/* ===== Upload ===== */
.upload-section {
  margin-bottom: 1.5rem;
}

.upload-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  background: var(--surface);
}

.upload-area:hover {
  border-color: var(--accent);
  background: var(--surface2);
}

.upload-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.upload-area p {
  font-size: 1.05rem;
  color: var(--text);
}

.upload-hint {
  font-size: 0.85rem !important;
  color: var(--text-dim) !important;
  margin-top: 0.4rem;
}

/* ===== Controls ===== */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  align-items: flex-start;
}

.play-btn {
  padding: 0.4rem 1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.85rem;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
}

.play-btn:hover {
  opacity: 0.85;
}

/* ===== Playback bar ===== */

.playback {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.playback-label {
  font-size: 0.85rem;
  color: var(--text);
  white-space: nowrap;
}

.export-btn {
  padding: 0.4rem 0.8rem;
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.8rem;
  cursor: pointer;
}

.export-btn:hover {
  border-color: var(--accent);
}

.control-group {
  flex: 1;
  min-width: 280px;
}

.control-group h3 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.slider-row, .select-row {
  margin-bottom: 0.6rem;
}

.slider-row label, .select-row label {
  display: block;
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 0.25rem;
}

.slider-row label span {
  color: var(--text);
  font-weight: 600;
}

input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

select {
  width: 100%;
  padding: 0.4rem 0.6rem;
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.9rem;
  cursor: pointer;
}

select:focus {
  outline: none;
  border-color: var(--accent);
}

input[type="text"] {
  width: 100%;
  padding: 0.4rem 0.6rem;
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.9rem;
  font-family: var(--font-mono);
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

/* ===== Toggle Switch ===== */
.toggle-row {
  margin-top: 0.8rem;
}

.toggle-row label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-dim);
  user-select: none;
}

.toggle-row input[type="checkbox"] {
  display: none;
}

.toggle-track {
  position: relative;
  width: 40px;
  height: 22px;
  background: var(--border);
  border-radius: 11px;
  transition: background 0.2s;
  flex-shrink: 0;
}

.toggle-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--text);
  border-radius: 50%;
  transition: transform 0.2s;
}

.toggle-row input:checked + .toggle-track {
  background: var(--accent);
}

.toggle-row input:checked + .toggle-track::after {
  transform: translateX(18px);
}

/* ===== Views ===== */
.views {
  display: flex;
  gap: 1rem;
  height: 55vh;
  min-height: 350px;
}

.view-column {
  flex: 1;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
}

.view-column h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 0.5rem;
  text-align: center;
}

.canvas-wrapper, .ascii-wrapper {
  flex: 1;
  overflow: auto;
  background: #f8f9fa;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  min-width: 0;
}

.canvas-wrapper canvas {
  max-width: 100%;
  max-height: 100%;
  display: block;
  image-rendering: pixelated;
}

.ascii-wrapper {
  align-items: center;
  justify-content: center;
  padding: 0;
  overflow: hidden;
  min-height: 0;
}

.ascii-zoom-wrap {
  width: 100%;
  height: 100%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ascii-svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* ===== Loading Overlay ===== */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(248, 249, 250, 0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(2px);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  margin-top: 1rem;
  font-size: 0.95rem;
  color: var(--text-dim);
}

/* ===== GitHub Corner ===== */
.github-corner:hover .octo-arm {
  animation: octocat-wave 560ms ease-in-out;
}

@keyframes octocat-wave {
  0%, 100% { transform: rotate(0); }
  20%, 60% { transform: rotate(-25deg); }
  40%, 80% { transform: rotate(10deg); }
}

@media (max-width: 500px) {
  .github-corner:hover .octo-arm {
    animation: none;
  }
  .github-corner .octo-arm {
    animation: octocat-wave 560ms ease-in-out;
  }
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .views {
    flex-direction: column;
  }

  .controls {
    flex-direction: column;
    gap: 1rem;
  }
}