/* ===== CSS VARIABLES ===== */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #a5b4fc;
  --success: #10b981;
  --success-dark: #059669;
  --danger: #ef4444;
  --warning: #f59e0b;
  --dark: #1e293b;
  --light: #f8fafc;
  --gray: #64748b;
  --gray-light: #e2e8f0;
  --card-bg: #ffffff;
  --shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 32px -4px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

/* ===== BASE STYLES ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  color: var(--dark);
  background: radial-gradient(circle at 10% 10%, rgba(99,102,241,0.06), transparent 12%), linear-gradient(135deg, #f4f6fb 0%, #eef2fb 50%, #f7f9fd 100%);
  line-height: 1.5;
  min-height: 100vh;
  padding: 16px;
  font-size: 14px;
}

/* subtle moving gradient overlay for premium feel */
.background-anim::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(120deg, rgba(99,102,241,0.06), rgba(16,185,129,0.03), rgba(59,130,246,0.04));
  opacity: 0.9;
  transform: translateZ(0);
  animation: bgMove 12s linear infinite;
  background-size: 200% 200%;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
}

/* Ad slot placeholder - sized and non-intrusive for Google Ads */
.ad-slot { display:flex; justify-content:center; margin: 10px 0 18px; }
.ad-placeholder { width: 728px; max-width: 90%; height: 90px; border-radius: 8px; background: linear-gradient(90deg, rgba(0,0,0,0.03), rgba(0,0,0,0.01)); display:flex; align-items:center; justify-content:center; color:var(--gray); font-weight:600; font-size:0.95rem; border: 1px dashed rgba(0,0,0,0.06); }

/* ===== HEADER STYLES ===== */
header {
  text-align: center;
  margin-bottom: 32px;
  padding: 20px 0;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
}

.logo-icon {
  font-size: 32px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(99, 102, 241, 0.3));
  transform-origin: center;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0% { transform: translateY(0); }
  50% { transform: translateY(-6px) rotate(-2deg); }
  100% { transform: translateY(0); }
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
  letter-spacing: -0.025em;
}

.subtitle {
  font-size: 1rem;
  color: var(--gray);
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ===== CARD STYLES ===== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.9);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

.card h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--dark);
  font-weight: 600;
}

.card h2 i {
  color: var(--primary);
  font-size: 1.1rem;
}

/* ===== UPLOAD SECTION ===== */
.upload-section {
  text-align: center;
}

.upload-area {
  border: 2px dashed var(--gray-light);
  border-radius: var(--radius);
  padding: 24px 14px;
  margin: 20px 0;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  background: rgba(248, 250, 252, 0.5);
  backdrop-filter: blur(6px) saturate(120%);
  border-image: linear-gradient(90deg, rgba(99,102,241,0.25), rgba(16,185,129,0.12)) 1;
}

.upload-area:hover, .upload-area.dragover {
  border-color: var(--primary);
  background: linear-gradient(180deg, rgba(255,255,255,0.6), rgba(255,255,255,0.35));
  transform: scale(1.005);
}

.upload-area.dragover {
  background: rgba(99, 102, 241, 0.05);
}

.upload-icon {
  font-size: 36px;
  color: var(--primary);
  margin-bottom: 12px;
  opacity: 0.8;
}

.upload-text {
  font-size: 1.1rem;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--dark);
}

.upload-subtext {
  color: var(--gray);
  margin-bottom: 20px;
  font-size: 0.875rem;
}

.browse-btn {
  background: linear-gradient(90deg, #7c5cff 0%, #4f46e5 50%, #06b6d4 100%);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 10px 30px rgba(79,70,229,0.15);
}

.browse-btn:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 18px 36px rgba(79,70,229,0.18);
}

.file-input {
  display: none;
}

/* ===== PREVIEWS CONTAINER WITH SCROLL ===== */
.previews-container {
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  padding: 16px;
  margin: 20px 0;
  background: rgba(248, 250, 252, 0.5);
}

.previews-container::-webkit-scrollbar {
  width: 6px;
}

.previews-container::-webkit-scrollbar-track {
  background: var(--gray-light);
  border-radius: 3px;
}

.previews-container::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 3px;
}

.previews-container::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

/* ===== IMAGE PREVIEWS ===== */
.image-previews {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}

.preview-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.9);
  position: relative;
}

.preview-card:hover {
  transform: translateY(-6px) rotateX(2deg) scale(1.02);
  box-shadow: 0 18px 40px rgba(16,24,40,0.08);
}

.preview-image {
  width: 100%;
  height: 84px;
  object-fit: cover;
}

/* processing overlay for preview cards */
.preview-card.processing {
  position: relative;
}

.preview-card.processing::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-card.processing::after {
  background: rgba(255,255,255,0.6);
}

.preview-card.processing .preview-image {
  filter: blur(1px) brightness(0.95);
}

.preview-card.processing .preview-remove {
  display: none;
}

.preview-card.processing::before {
  content: "";
  width: 28px;
  height: 28px;
  border: 4px solid rgba(99,102,241,0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* removal animation for previews and gallery cards */
.preview-card.removing,
.image-card.removing {
  animation: removePop 360ms cubic-bezier(.2,.9,.2,1) forwards;
}

@keyframes removePop {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-14px) scale(.96); }
}

.preview-card.done::after {
  content: "\2713";
  position: absolute;
  right: 8px;
  top: 8px;
  background: var(--success);
  color: white;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

.preview-info {
  padding: 8px;
}

.preview-name {
  font-weight: 600;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.75rem;
}

.preview-details {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--gray);
}

.preview-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  background: rgba(239, 68, 68, 0.9);
  color: white;
  border: none;
  border-radius: 50%;
  width: 18px;
  height: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  opacity: 0;
  transition: var(--transition);
}

.preview-card:hover .preview-remove {
  opacity: 1;
}

/* ===== CONTROLS SECTION ===== */
.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.control-group {
  margin-bottom: 16px;
}

.control-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--dark);
  font-size: 0.9rem;
}

.control-label i {
  color: var(--primary);
  font-size: 0.9rem;
}

.slider-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.quality-slider {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--gray-light);
  outline: none;
  -webkit-appearance: none;
}

.quality-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
  border: 2px solid white;
  transition: var(--transition);
}

/* Firefox track styling */
.quality-slider::-moz-range-track {
  height: 6px;
  border-radius: 3px;
  background: var(--gray-light);
}

.quality-slider::-moz-range-progress {
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(90deg, rgba(124,92,255,0.95), rgba(79,70,229,0.95));
}

/* IE/Edge optional */
.quality-slider::-ms-fill-lower {
  background: linear-gradient(90deg, rgba(124,92,255,0.95), rgba(79,70,229,0.95));
}
.quality-slider::-ms-fill-upper {
  background: var(--gray-light);
}

.quality-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
}

.quality-value {
  font-weight: 700;
  min-width: 40px;
  text-align: center;
  color: var(--primary);
  font-size: 0.9rem;
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--gray);
  margin-top: 4px;
}

.format-options {
  display: flex;
  gap: 8px;
}

.format-option {
  flex: 1;
}

.format-option input {
  display: none;
}

.format-label {
  display: block;
  padding: 10px 12px;
  text-align: center;
  border: 1px solid var(--gray-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
  background: white;
  font-size: 0.85rem;
}

.format-label:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.03);
  transform: translateY(-1px);
}

.format-option input:checked + .format-label {
  border-color: var(--primary);
  background: var(--gradient);
  color: white;
  box-shadow: 0 2px 6px rgba(99, 102, 241, 0.25);
}

/* ===== BUTTON STYLES ===== */
.action-buttons {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 20px 0;
}

.btn {
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn-primary {
  background: linear-gradient(90deg,#7c5cff 0%, #4f46e5 50%, #06b6d4 100%);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 14px 36px rgba(79,70,229,0.14);
}

.btn-primary:active { transform: translateY(1px) scale(.99); }

.btn--pulse { animation: pulse 1.6s infinite; }

@keyframes pulse { 0%{ box-shadow:0 6px 18px rgba(79,70,229,0.12); } 50%{ box-shadow:0 14px 36px rgba(79,70,229,0.12); transform: translateY(-2px); } 100%{ box-shadow:0 6px 18px rgba(79,70,229,0.12); } }

.btn-secondary {
  background: var(--gray-light);
  color: var(--dark);
}

.btn-secondary:hover:not(:disabled) {
  background: #cbd5e1;
  transform: translateY(-1px);
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover:not(:disabled) {
  background: var(--success-dark);
  transform: translateY(-1px);
}

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

.btn-danger:hover:not(:disabled) {
  background: #dc2626;
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* ===== STATUS & PROGRESS ===== */
.status {
  margin: 16px 0;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 500;
  font-size: 0.875rem;
}

.status-processing {
  background: rgba(245, 158, 11, 0.08);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.15);
}

.status-success {
  background: rgba(16, 185, 129, 0.08);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.15);
}

.status-error {
  background: rgba(239, 68, 68, 0.08);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.15);
}

.progress-section {
  display: none;
  margin: 24px 0;
}

/* Toast notifications */
#toastContainer {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.toast {
  min-width: 220px;
  max-width: 320px;
  background: rgba(255,255,255,0.96);
  border-radius: 10px;
  padding: 12px 14px;
  box-shadow: 0 8px 30px rgba(16,24,40,0.08);
  display: flex;
  gap: 10px;
  align-items: center;
  font-weight: 600;
  color: var(--dark);
  border-left: 4px solid var(--primary);
  animation: toastIn 300ms ease forwards;
}
.toast.error { border-left-color: var(--danger); }
.toast.info { border-left-color: var(--primary); }
.toast.success { border-left-color: var(--success); }
.toast .icon { font-size: 18px; opacity: 0.9; }
@keyframes toastIn { from { transform: translateY(-8px) scale(.98); opacity: 0 } to { transform: translateY(0) scale(1); opacity: 1 } }

.progress-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 0.875rem;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--gray-light);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, rgba(124,92,255,0.95), rgba(79,70,229,0.95));
  width: 0%;
  transition: width 0.3s ease;
  border-radius: 4px;
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* ===== RESULTS SECTION ===== */
.results-section {
  display: none;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.results-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.9);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.stat-label {
  color: var(--gray);
  font-size: 0.8rem;
  font-weight: 500;
}

.savings {
  color: var(--success);
}

.no-savings {
  color: var(--danger);
}

/* ===== GALLERY CONTAINER WITH SCROLL ===== */
.gallery-container {
  max-height: 400px;
  overflow-y: auto;
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  padding: 16px;
  background: rgba(248, 250, 252, 0.5);
}

.gallery-container::-webkit-scrollbar {
  width: 6px;
}

.gallery-container::-webkit-scrollbar-track {
  background: var(--gray-light);
  border-radius: 3px;
}

.gallery-container::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 3px;
}

.gallery-container::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.image-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.9);
}

.image-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.image-container {
  position: relative;
  overflow: hidden;
}

.image-card img {
  width: 100%;
  height: 120px;
  object-fit: cover;
  transition: var(--transition);
}

.image-card:hover img {
  transform: scale(1.03);
}

.image-info {
  padding: 12px;
}

.image-name {
  font-weight: 600;
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.8rem;
}

.image-stats {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.75rem;
}

.image-size {
  color: var(--gray);
}

.image-savings {
  font-weight: 600;
}

.image-actions {
  display: flex;
  gap: 6px;
}

.image-actions .btn {
  flex: 1;
  padding: 6px 10px;
  font-size: 0.75rem;
  justify-content: center;
}

/* ===== COMPRESSION ANIMATION ===== */
.compression-animation {
  display: none;
  text-align: center;
  margin: 24px 0;
}

.animation-container {
  display: inline-block;
  position: relative;
  width: 80px;
  height: 80px;
  margin-bottom: 16px;
}

.spinner {
  width: 64px;
  height: 64px;
  border: 6px solid rgba(99, 102, 241, 0.12);
  border-top: 6px solid #7c5cff;
  border-radius: 50%;
  animation: spin 1.2s linear infinite;
}

.checkmark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 32px;
  color: var(--success);
  opacity: 0;
  transition: opacity 0.3s ease;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.3s ease forwards;
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  margin-top: 48px;
  padding: 24px 0;
  color: var(--gray);
  border-top: 1px solid var(--gray-light);
  font-size: 0.8rem;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  body {
    padding: 12px;
    font-size: 13px;
  }
  
  .container {
    padding: 0 12px;
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  .card {
    padding: 20px;
  }
  
  .upload-area {
    padding: 32px 16px;
  }
  
  .controls {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .action-buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .results-header {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
  
  .gallery {
    grid-template-columns: 1fr;
  }
  
  .image-previews {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 10px;
  }
  
  .previews-container,
  .gallery-container {
    max-height: 250px;
  }
}

@media (max-width: 480px) {
  body {
    padding: 8px;
  }
  
  h1 {
    font-size: 1.5rem;
  }
  
  .subtitle {
    font-size: 0.9rem;
  }
  
  .upload-text {
    font-size: 1rem;
  }
  
  .format-options {
    flex-direction: column;
  }
  
  .card h2 {
    font-size: 1.1rem;
  }
  
  .stat-card {
    padding: 12px;
  }
  
  .stat-value {
    font-size: 1.5rem;
  }
  
  .previews-container,
  .gallery-container {
    max-height: 200px;
  }
}