/* 
 * ASCIIGram Premium Design System & Styles
 * Curated dark mode theme, glassmorphic UI cards, and responsive layouts.
 */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&family=Outfit:wght@300;400;600;800&display=swap');

:root {
  /* Colors */
  --bg-base: hsl(240, 25%, 6%);
  --bg-card: hsla(240, 22%, 10%, 0.7);
  --bg-card-hover: hsla(240, 22%, 14%, 0.85);
  --border-color: hsla(240, 15%, 20%, 0.6);
  --border-glow: hsla(260, 80%, 65%, 0.4);
  
  --text-primary: hsl(0, 0%, 98%);
  --text-secondary: hsl(240, 8%, 70%);
  --text-muted: hsl(240, 5%, 50%);

  --accent-color: hsl(260, 85%, 66%);
  --accent-light: hsl(240, 85%, 72%);
  --accent-gradient: linear-gradient(135deg, hsl(260, 85%, 66%) 0%, hsl(220, 85%, 60%) 100%);
  --accent-gradient-hover: linear-gradient(135deg, hsl(260, 95%, 70%) 0%, hsl(220, 95%, 65%) 100%);
  
  --success-color: hsl(142, 70%, 45%);
  --success-bg: hsla(142, 70%, 45%, 0.15);
  --error-color: hsl(0, 85%, 60%);
  
  /* Layout tokens */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Outfit', sans-serif;
  background-color: var(--bg-base);
  background-image: 
    radial-gradient(at 10% 20%, hsla(260, 45%, 15%, 0.3) 0px, transparent 50%),
    radial-gradient(at 90% 80%, hsla(220, 45%, 15%, 0.25) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Base Container */
.app-container {
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Header styling */
header {
  text-align: center;
  margin-bottom: 0.5rem;
}

.logo-container {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.logo-text {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-badge {
  font-size: 0.75rem;
  font-weight: 600;
  background: hsla(260, 85%, 66%, 0.15);
  color: var(--accent-light);
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
  border: 1px solid hsla(260, 85%, 66%, 0.3);
  text-transform: uppercase;
}

header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 350;
}

/* Glassmorphic Card Base */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: 0 10px 30px -10px rgba(0,0,0,0.5);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  border-color: hsla(260, 45%, 35%, 0.5);
}

/* Upload Area */
.upload-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  background: hsla(240, 20%, 6%, 0.3);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--accent-color);
  box-shadow: 0 0 20px var(--border-glow);
  background: hsla(240, 20%, 15%, 0.4);
}

.upload-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
  transition: transform var(--transition-fast);
}

.upload-zone:hover .upload-icon {
  transform: translateY(-4px);
}

.upload-text {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.upload-subtext {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* Control Panel */
.controls-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

@media (min-width: 768px) {
  .controls-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    align-items: center;
  }
}

/* Custom Select Field */
.select-field {
  width: 100%;
  background: hsla(240, 20%, 6%, 0.4);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.65rem 1.2rem;
  font-size: 0.95rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  border-radius: var(--radius-md);
  outline: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'></polyline></svg>");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.1rem;
}

.select-field:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 15px var(--border-glow);
  background: hsla(240, 20%, 10%, 0.6);
}

.select-field option {
  background-color: hsl(240, 25%, 6%);
  color: var(--text-primary);
}

/* Character Counter Pill */
.char-counter {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  background: hsla(240, 20%, 6%, 0.5);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  color: var(--accent-light);
  border: 1px solid var(--border-color);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.char-counter.warning {
  color: var(--error-color);
  border-color: hsla(0, 85%, 60%, 0.4);
  background: hsla(0, 85%, 60%, 0.05);
  box-shadow: 0 0 10px hsla(0, 85%, 60%, 0.15);
}

/* Disabled Control State (Faded slider) */
.control-group.disabled {
  opacity: 0.4;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-label-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.control-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.control-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  background: hsla(240, 20%, 6%, 0.5);
  padding: 0.1rem 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--accent-light);
  border: 1px solid var(--border-color);
}

/* Custom Range Slider */
.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: hsla(240, 15%, 20%, 0.8);
  outline: none;
  transition: background var(--transition-fast);
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-color);
  cursor: pointer;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

.slider::-webkit-slider-thumb:hover {
  background: var(--text-primary);
  transform: scale(1.2);
}

.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-color);
  cursor: pointer;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
  border: none;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

.slider::-moz-range-thumb:hover {
  background: var(--text-primary);
  transform: scale(1.2);
}

/* Toggle Switch */
.toggle-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: hsla(240, 20%, 6%, 0.3);
  padding: 0.8rem 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.toggle-wrapper:hover {
  background: hsla(240, 20%, 6%, 0.6);
}

.toggle-wrapper span {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider-round {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: hsla(240, 15%, 20%, 0.8);
  transition: var(--transition-fast);
  border-radius: 34px;
}

.slider-round:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 4px;
  bottom: 4px;
  background-color: var(--text-primary);
  transition: var(--transition-fast);
  border-radius: 50%;
}

input:checked + .slider-round {
  background: var(--accent-gradient);
}

input:checked + .slider-round:before {
  transform: translateX(20px);
}

/* Preview Section */
.workspace-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .workspace-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.preview-card {
  display: flex;
  flex-direction: column;
  min-height: 350px;
}

.preview-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.preview-content {
  flex-grow: 1;
  background: hsl(240, 25%, 5%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

/* Original Image Preview */
.img-preview {
  max-width: 100%;
  max-height: 300px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  display: none;
}

.placeholder-text {
  color: var(--text-muted);
  text-align: center;
  font-size: 0.95rem;
}

/* ASCII Output Preview */
.ascii-output-container {
  width: 100%;
  height: 100%;
  min-height: 280px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.ascii-pre {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.4rem; /* Tiny size to fit large character counts, adjusted dynamically later */
  line-height: 0.85; /* Squish lines together vertically for blocks */
  letter-spacing: 0;
  white-space: pre;
  color: var(--text-primary);
  overflow: auto;
  max-height: 300px;
  flex-grow: 1;
  text-align: left;
  display: block;
}

.ascii-pre:empty {
  display: none;
}

/* Copy Action Bar */
.action-bar {
  margin-top: 1rem;
}

.btn-primary {
  width: 100%;
  background: var(--accent-gradient);
  color: var(--text-primary);
  border: none;
  padding: 0.9rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 15px hsla(260, 85%, 66%, 0.3);
}

.btn-primary:hover {
  background: var(--accent-gradient-hover);
  box-shadow: 0 6px 20px hsla(260, 85%, 66%, 0.45);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(1px);
}

.btn-primary:disabled {
  background: hsla(240, 10%, 20%, 0.5);
  color: var(--text-muted);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

.btn-primary.copied {
  background: var(--success-bg);
  color: var(--success-color);
  border: 1.5px solid var(--success-color);
  box-shadow: none;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: hsla(142, 70%, 45%, 0.9);
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  font-weight: 600;
  box-shadow: 0 10px 25px -5px rgba(0,0,0,0.3);
  z-index: 1000;
  transition: transform var(--transition-normal);
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* Tabs Switcher */
.tabs-container {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding: 0.25rem;
  background: hsla(240, 20%, 6%, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
  border-radius: calc(var(--radius-md) - 4px);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: hsla(240, 15%, 20%, 0.3);
}

.tab-btn.active {
  background: var(--accent-gradient);
  color: var(--text-primary);
  box-shadow: 0 4px 12px hsla(260, 85%, 66%, 0.25);
}

/* Text Input Panel */
.text-input-panel {
  margin-bottom: 1rem;
}

.control-group-row {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 600px) {
  .control-group-row {
    flex-direction: row;
  }
}

.text-field {
  width: 100%;
  background: hsla(240, 20%, 6%, 0.4);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 1rem 1.25rem;
  font-size: 1.35rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 650;
  letter-spacing: 0.08em;
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  text-align: center;
}

.text-field:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 15px var(--border-glow);
  background: hsla(240, 20%, 10%, 0.6);
}

.input-tip {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.6rem;
  line-height: 1.4;
  text-align: center;
}

/* Single Column Grid Modifier */
@media (min-width: 768px) {
  .workspace-grid.single-column {
    grid-template-columns: 1fr;
    max-width: 550px;
    margin: 0 auto;
  }
}

/* Toggles Layout */
.control-group-toggles {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Background removal loading overlay */
.bg-loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: hsla(240, 25%, 5%, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 10;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  animation: bgFadeIn 0.25s ease-out forwards;
}

.bg-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid hsla(260, 85%, 66%, 0.15);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: bgSpin 0.8s linear infinite;
}

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

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

/* Footer & Branding */
footer {
  text-align: center;
  padding: 2rem 0;
  margin-top: auto;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--accent-light);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}

footer a:hover {
  color: var(--text-primary);
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: hsla(240, 15%, 25%, 0.6);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: hsla(240, 15%, 35%, 0.8);
}