@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Primary brand colors */
  --primary-gradient-start: #4F46E5;
  --primary-gradient-end: #7C3AED;
  --primary-color: #4F46E5;
  --secondary-color: #06B6D4;
  --accent-color: #3ABFF8;
  --success-color: #36D399;

  /* Neutral colors */
  --neutral-50: #F9FAFB;
  --neutral-100: #F3F4F6;
  --neutral-200: #E5E7EB;
  --neutral-300: #D1D5DB;
  --neutral-400: #9CA3AF;
  --neutral-500: #6B7280;
  --neutral-600: #4B5563;
  --neutral-700: #374151;
  --neutral-800: #1F2937;
  --neutral-900: #111827;

  /* UI states */
  --error-color: #EF4444;
  --warning-color: #F59E0B;
  --info-color: #3B82F6;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  --shadow-card: 0 10px 30px -15px rgba(79, 70, 229, 0.2);

  /* Animation timing */
  --transition-fast: 150ms;
  --transition-normal: 300ms;
  --transition-slow: 500ms;
}

/* Base styles */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: linear-gradient(135deg, var(--neutral-100), var(--neutral-50));
  background-attachment: fixed;
  color: var(--neutral-800);
  min-height: 100vh;
  line-height: 1.6;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  color: var(--neutral-900);
  line-height: 1.3;
}

/* Container and layout */
.container {
  max-width: 1200px;
}

.main-card {
  border-radius: 24px;
  overflow: hidden;
  border: none;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
  transform-style: preserve-3d;
  transition: transform var(--transition-normal) ease,
    box-shadow var(--transition-normal) ease;
}

.main-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px -15px rgba(79, 70, 229, 0.25);
}

/* Header and footer */
.card-header {
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.card-header::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 60%);
  animation: rotate 20s linear infinite;
}

.card-header h1 {
  position: relative;
  margin: 0;
  font-weight: 700;
  background: linear-gradient(to right, #fff, rgba(255, 255, 255, 0.8));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.card-footer {
  border-top: 1px solid var(--neutral-200);
  background-color: rgba(255, 255, 255, 0.8) !important;
  backdrop-filter: blur(5px);
}

/* Upload area - completely restyled */
.upload-area {
  border: 2px dashed var(--neutral-300);
  border-radius: 16px;
  padding: 3rem;
  cursor: pointer;
  transition: all var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1);
  background: linear-gradient(145deg, var(--neutral-50), var(--neutral-100));
  position: relative;
  overflow: hidden;
}

.upload-area::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(124, 58, 237, 0.05) 100%);
  opacity: 0;
  transition: opacity var(--transition-normal) ease;
}

.upload-area:hover,
.upload-area.drag-over {
  border-color: var(--primary-color);
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.upload-area:hover::before,
.upload-area.drag-over::before {
  opacity: 1;
}

.upload-area i {
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(79, 70, 229, 0.3));
  transform-style: preserve-3d;
  transition: transform var(--transition-normal) ease;
}

.upload-area:hover i {
  transform: translateZ(10px);
  animation: float 3s ease-in-out infinite;
}

/* Buttons */
.btn {
  border-radius: 12px;
  padding: 0.6rem 1.5rem;
  font-weight: 500;
  transition: all var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0));
  transform: translateY(-100%);
  transition: transform var(--transition-normal) ease;
}

.btn:hover::before {
  transform: translateY(0);
}

.btn-lg {
  font-size: 1.05rem;
  padding: 0.75rem 2rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  border: none;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover,
.btn-primary:focus {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(79, 70, 229, 0.35);
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-color));
}

.btn-success {
  background: linear-gradient(135deg, var(--success-color), #2bb583);
  border: none;
  box-shadow: 0 4px 12px rgba(54, 211, 153, 0.25);
}

.btn-success:hover,
.btn-success:focus {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(54, 211, 153, 0.35);
  background: linear-gradient(135deg, var(--success-color), #27a478);
}

.btn-outline-secondary {
  color: var(--neutral-700);
  border-color: var(--neutral-300);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(5px);
}

.btn-outline-secondary:hover {
  background-color: var(--neutral-100);
  color: var(--primary-color);
  border-color: var(--primary-color);
}

/* Form controls */
.form-label {
  font-weight: 500;
  color: var(--neutral-700);
  margin-bottom: 0.5rem;
}

.form-select,
.form-control {
  border-radius: 10px;
  border-color: var(--neutral-300);
  padding: 0.6rem 1rem;
  font-size: 0.95rem;
  transition: all var(--transition-normal) ease;
  box-shadow: var(--shadow-sm);
}

.form-select:focus,
.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* Progress bar */
.progress {
  height: 12px;
  border-radius: 6px;
  overflow: hidden;
  background-color: var(--neutral-200);
  box-shadow: var(--shadow-inner);
}

.progress-bar {
  background: linear-gradient(to right, var(--primary-gradient-start), var(--accent-color));
  position: relative;
  overflow: hidden;
}

.progress-bar::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg,
      rgba(255, 255, 255, 0) 0%,
      rgba(255, 255, 255, 0.3) 50%,
      rgba(255, 255, 255, 0) 100%);
  animation: shimmer 1.5s infinite;
}

/* Table */
.table {
  border-radius: 12px;
  overflow: hidden;
  border-collapse: separate;
  border-spacing: 0;
  box-shadow: var(--shadow-md);
  margin-bottom: 2rem;
}

.table-light {
  background-color: var(--neutral-100);
}

.table thead th {
  font-weight: 600;
  color: var(--neutral-700);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.file-item {
  transition: all var(--transition-normal) ease;
  background-color: rgba(255, 255, 255, 0.7);
}

.file-item:hover {
  background-color: rgba(79, 70, 229, 0.05);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.file-item .download-item {
  transform: translateY(0);
  transition: all var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1);
}

.file-item:hover .download-item {
  transform: translateY(-2px);
  color: var(--primary-color);
}

/* Advanced options styling */
#advanced-options .card-body {
  padding: 1.5rem;
  background-color: var(--neutral-50);
  border-radius: 16px;
  box-shadow: var(--shadow-inner);
  transition: all var(--transition-normal) ease;
}

#advanced-options .card-title {
  font-size: 1.1rem;
  background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1.25rem;
  font-weight: 600;
}

/* Custom form controls */
.form-check-input {
  width: 1.2rem;
  height: 1.2rem;
}

.form-check-input:checked {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

.form-check-input:focus {
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.form-switch .form-check-input {
  width: 2.5em;
  height: 1.25em;
}

.form-switch .form-check-input:checked {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%23fff'/%3e%3c/svg%3e");
}

/* Range inputs */
.form-range::-webkit-slider-thumb {
  background: var(--primary-color);
  box-shadow: 0 0 5px rgba(79, 70, 229, 0.3);
  height: 1.2rem;
  width: 1.2rem;
}

.form-range::-moz-range-thumb {
  background: var(--primary-color);
  box-shadow: 0 0 5px rgba(79, 70, 229, 0.3);
  height: 1.2rem;
  width: 1.2rem;
}

.form-range::-webkit-slider-runnable-track {
  background-color: var(--neutral-300);
  height: 0.4rem;
  border-radius: 0.25rem;
}

.form-range::-moz-range-track {
  background-color: var(--neutral-300);
  height: 0.4rem;
  border-radius: 0.25rem;
}

/* Alert styling */
.alert {
  border-radius: 12px;
  padding: 1rem;
  border: none;
  box-shadow: var(--shadow-md);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
}

.alert-success {
  background-color: rgba(54, 211, 153, 0.15);
  border-left: 4px solid var(--success-color);
  color: #065f46;
}

/* Animations */
@keyframes float {

  0%,
  100% {
    transform: translateY(0) translateZ(10px);
  }

  50% {
    transform: translateY(-10px) translateZ(20px);
  }
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }

  100% {
    transform: translateX(100%);
  }
}

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

  100% {
    transform: rotate(360deg);
  }
}

/* Background particles effect */
.particle {
  position: absolute;
  border-radius: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.2) 0%, rgba(79, 70, 229, 0) 70%);
  filter: blur(10px);
  z-index: -1;
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.5;
  }

  50% {
    transform: translate(-50%, -50%) scale(1.2);
    opacity: 0.8;
  }
}

/* Theme transitions */
.theme-transition {
  transition: background-color 0.5s ease,
    color 0.5s ease,
    border-color 0.5s ease,
    box-shadow 0.5s ease;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .container {
    padding: 0.5rem;
  }

  .card-header {
    padding: 1.5rem 1rem;
  }

  .card-header h1 {
    font-size: 1.5rem;
  }

  .card-body {
    padding: 1rem !important;
  }

  .upload-area {
    padding: 1.5rem 1rem;
  }

  .upload-icon-container i {
    font-size: 3rem;
  }

  .btn {
    padding: 0.5rem 1rem;
    width: 100%;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  /* File List Mobile Styles */
  .nuf__header {
    flex-wrap: wrap;
    gap: 10px;
  }

  .nuf__header h4 {
    font-size: 1.1rem;
    flex-grow: 1;
  }

  #nuf-clear-btn {
    width: auto !important;
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
  }

  .nuf__wrapper {
    padding: 1rem !important;
  }

  .nuf__item {
    position: relative;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    padding: 1rem;
    padding-right: 3rem;
    /* Space for remove button */
  }

  /* Icon + Name */
  .nuf__item>div:nth-child(1) {
    width: 100% !important;
    margin-bottom: 0.25rem;
  }

  /* Format */
  .nuf__item>div:nth-child(2) {
    display: inline-block;
    width: auto !important;
    margin-left: 48px;
    /* Icon 32px + margin 16px */
    margin-right: 10px;
    text-align: left !important;
    background: var(--neutral-100);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem !important;
    font-weight: 600;
  }

  /* Size */
  .nuf__item>div:nth-child(3) {
    display: inline-block;
    width: auto !important;
    text-align: left !important;
    font-size: 0.75rem !important;
  }

  /* Remove Btn */
  .nuf__item>div:nth-child(4) {
    position: absolute;
    top: 50%;
    right: 0.5rem;
    transform: translateY(-50%);
    width: auto !important;
    justify-content: flex-end !important;
    margin: 0 !important;
  }

  .nuf__icon {
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }

  .nuf__remove-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: transparent;
    color: #9ca3af;
    border: 1px solid transparent;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nuf__remove-btn:hover {
    background-color: #fee2e2;
    color: #dc3545;
    border-color: #fecaca;
  }

  .ncr__header {
    padding: 1rem;
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }

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

  .ncr__file-info {
    width: 100% !important;
  }

  .ncr__arrow {
    transform: rotate(90deg);
    margin: 0.5rem 0;
  }

  .ncr__item>div:last-child {
    width: 100% !important;
    justify-content: space-between !important;
    margin-top: 0.5rem;
  }

  .ncr__status-badge {
    flex-grow: 1;
    justify-content: center;
  }

  .ncr__download-btn {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
  }

  .ncr__footer {
    flex-direction: column;
  }

  /* Format Selector Mobile */
  .format-selector {
    justify-content: center;
  }

}

.nuf__item {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid #f0f0f0;
  transition: background-color 0.2s;
}

.nuf__item:last-child {
  border-bottom: none;
}

.nuf__item:hover {
  background-color: #f8f9fa;
}

.nuf__icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: #f0f2f5;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #6c757d;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.nuf__name {
  font-weight: 500;
  color: #333;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nuf__meta {
  font-size: 0.85rem;
  color: #888;
}

.nuf__remove-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #dc3545;
  border: 1px solid transparent;
  background: transparent;
  transition: all 0.2s;
}

.nuf__remove-btn:hover {
  background-color: #fee2e2;
  border-color: #fecaca;
}

/* --- Conversion Results Section (ncr__) --- */
.ncr__wrapper {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  overflow: hidden;
}

.ncr__header {
  background: #ecfdf5;
  /* Green-50 */
  color: #065f46;
  /* Green-800 */
  padding: 16px 24px;
  border-bottom: 1px solid #d1fae5;
}

.ncr__list {
  padding: 0;
  margin: 0;
  list-style: none;
}

.ncr__item {
  display: flex;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid #f0f0f0;
}

.ncr__item:last-child {
  border-bottom: none;
}

.ncr__file-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ncr__icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.ncr__icon--original {
  background: #f3f4f6;
  color: #4b5563;
}

.ncr__icon--converted {
  background: #ecfdf5;
  color: #059669;
}

.ncr__arrow {
  color: #9ca3af;
  margin: 0 16px;
  font-size: 1.1rem;
}

.ncr__status-badge {
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.ncr__status-badge--success {
  background: #d1fae5;
  color: #047857;
}

.ncr__status-badge--error {
  background: #fee2e2;
  color: #b91c1c;
}

.ncr__download-btn {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #3b82f6;
  border: 1px solid #bfdbfe;
  background: #eff6ff;
  transition: all 0.2s;
}

.ncr__download-btn:hover {
  background: #3b82f6;
  color: #fff;
  border-color: #3b82f6;
}

.ncr__footer {
  background: #f9fafb;
  padding: 20px;
  border-top: 1px solid #f0f0f0;
  display: flex;
  justify-content: center;
  gap: 12px;
}

/* Utility classes for responsive visibility */
@media (max-width: 768px) {
  .desktop-only {
    display: none !important;
  }

  .mobile-only {
    display: block !important;
  }
}

/* Default state for mobile-only elements (hidden on desktop) */
.mobile-only {
  display: none !important;
}