/* ============================================
   Image Sprite Packer — Styles
   Theme: Dark mode with Amber Gold palette
   ============================================ */

/* --- Design Tokens --- */
:root {
  --primary: #FDCB6E;
  --primary-dim: rgba(253, 203, 110, 0.15);
  --secondary: #FFEAA7;
  --accent: #6C5CE7;
  --accent-dim: rgba(108, 92, 231, 0.2);
  --bg: #1A150A;
  --bg-card: rgba(30, 24, 14, 0.65);
  --bg-surface: #241D10;
  --border: rgba(253, 203, 110, 0.12);
  --border-hover: rgba(253, 203, 110, 0.3);
  --text: #F5F0E8;
  --text-dim: #A89B80;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 250ms ease;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --shadow-glow: 0 0 40px rgba(253, 203, 110, 0.08);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(ellipse at 20% 0%, rgba(253, 203, 110, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 100%, rgba(108, 92, 231, 0.04) 0%, transparent 60%);
}

/* --- Glass Card --- */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-glow);
}

/* --- Header --- */
.header {
  padding: 2rem 1.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(253, 203, 110, 0.04) 0%, transparent 100%);
}
.header-inner { max-width: 800px; margin: 0 auto; }
.logo { display: flex; align-items: center; justify-content: center; gap: 0.75rem; }
.logo-icon { font-size: 2rem; }
.logo h1 {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.tagline {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* --- Main --- */
.main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* --- Drop Zone --- */
.drop-zone-section { width: 100%; }
.drop-zone {
  position: relative;
  border: 2px dashed var(--border-hover);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  background: var(--bg-card);
}
.drop-zone:hover, .drop-zone:focus-visible {
  border-color: var(--primary);
  background: var(--primary-dim);
  transform: translateY(-2px);
}
.drop-zone.drag-over {
  border-color: var(--primary);
  background: rgba(253, 203, 110, 0.1);
  transform: scale(1.01);
}
.drop-zone:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.drop-zone-content { pointer-events: none; }
.drop-icon { width: 48px; height: 48px; color: var(--primary); margin-bottom: 1rem; }
.drop-text { font-size: 1.1rem; color: var(--text); margin-bottom: 0.5rem; }
.browse-link { color: var(--primary); text-decoration: underline; font-weight: 600; }
.drop-hint { font-size: 0.85rem; color: var(--text-dim); }
.file-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* --- Controls --- */
.controls-section { padding: 1.5rem; }
.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  align-items: end;
}
.control-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
}
.control-input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  transition: border-color var(--transition);
}
.control-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-dim);
}
.control-actions {
  display: flex;
  gap: 0.5rem;
  align-items: end;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.25rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), #E0A800);
  color: #1A150A;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(253, 203, 110, 0.35); }
.btn-secondary {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }
.btn-accent {
  background: var(--accent);
  color: #fff;
}
.btn-accent:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(108, 92, 231, 0.35); }
.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.82rem; }

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.6rem;
  height: 1.6rem;
  padding: 0 0.4rem;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
}

/* --- Images Grid --- */
.images-section { width: 100%; }
.images-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 0.75rem;
}
.image-item {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), transform var(--transition);
}
.image-item:hover { border-color: var(--primary); transform: translateY(-2px); }
.image-item img {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
}
.image-item-name {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.3rem 0.4rem;
  background: rgba(0,0,0,0.7);
  font-size: 0.65rem;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.image-item-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 50%;
  background: rgba(200, 50, 50, 0.85);
  color: #fff;
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
  line-height: 1;
}
.image-item:hover .image-item-remove { opacity: 1; }

/* --- Output --- */
.output-section { width: 100%; }
.output-panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.output-panel { padding: 1.5rem; }
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.panel-header .section-title { margin-bottom: 0; }
.panel-actions { display: flex; gap: 0.5rem; }
.preview-wrapper {
  background: repeating-conic-gradient(#2a2316 0% 25%, var(--bg-surface) 0% 50%) 50% / 20px 20px;
  border-radius: var(--radius-sm);
  overflow: auto;
  max-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.preview-wrapper canvas {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  image-rendering: pixelated;
}
.preview-info {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}
.css-output {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.82rem;
  color: var(--secondary);
  line-height: 1.7;
  overflow: auto;
  max-height: 400px;
  white-space: pre;
  tab-size: 2;
}

/* --- Toast --- */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 8px 32px rgba(108, 92, 231, 0.4);
  z-index: 1000;
  transition: transform 300ms ease;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* --- Footer --- */
.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--text-dim);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}

/* --- Responsive --- */
@media (min-width: 768px) {
  .output-panels {
    grid-template-columns: 1.2fr 1fr;
  }
}
@media (max-width: 600px) {
  .header h1 { font-size: 1.35rem; }
  .drop-zone { padding: 2rem 1rem; }
  .controls-grid { grid-template-columns: 1fr 1fr; }
  .images-grid { grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); }
  .main { padding: 1.25rem 1rem 3rem; gap: 1.25rem; }
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeIn 300ms ease forwards; }