/* CSS Variables */
:root {
  /* Colors */
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --background-light: #f8fafc;
  --background-white: #ffffff;
  --border-color: #e2e8f0;
  --text-primary: #4b5563;
  --text-dark: #1f2937;
  --error-color: #ef4444;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-default: all 0.3s ease-in-out;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-full: 999px;
}

/* Base Styles */
body {
  overflow-x: hidden;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1 0 auto;
}

/* Header Styles */
header {
  box-shadow: var(--shadow-md);
  border-bottom: 1px solid var(--border-color);
}

header a {
  transition: var(--transition-default);
  font-weight: 500;
}

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

#mobileMenu {
  transition: all 0.3s ease;
  max-height: 0;
  overflow: hidden;
}

#mobileMenu:not(.hidden) {
  max-height: 200px;
}

#mobileMenuBtn {
  transition: var(--transition-default);
}

#mobileMenuBtn:hover {
  transform: scale(1.1);
}

/* Footer Styles */
footer {
  box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.05);
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

footer a {
  transition: var(--transition-default);
}

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

footer .social-icon {
  transition: var(--transition-default);
}

footer .social-icon:hover {
  transform: translateY(-2px);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--background-light);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
  background: var(--text-primary);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-dark);
}

/* Common Elements */
select,
input[type="text"],
input[type="number"] {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
  appearance: none;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  transition: var(--transition-default);
}

/* Buttons */
#compressBtn,
#downloadLink {
  transition: var(--transition-default);
  background: var(--primary-color);
  color: var(--background-white);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
}

#compressBtn:hover,
#downloadLink:hover {
  transform: translateY(-2px);
  background: var(--primary-hover);
  box-shadow: var(--shadow-lg);
}

/* Upload Zone */
.upload-zone {
  position: relative;
  transition: var(--transition-default);
  border: 2px dashed var(--border-color);
  background-color: var(--background-light);
}

.upload-zone.drag-over {
  border-color: var(--primary-color);
  background-color: rgba(59, 130, 246, 0.05);
  transform: scale(1.02);
}

.upload-icon {
  transition: var(--transition-default);
}

.drag-over .upload-icon {
  transform: scale(1.2);
  color: var(--primary-color);
}

/* Image Preview */
#preview,
#compressedPreview {
  transition: var(--transition-default);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--background-light);
  border: 2px dashed var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

#preview:hover,
#compressedPreview:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

/* Error Message */
#errorMessage {
  transition: var(--transition-default);
  opacity: 1;
}

#errorMessage.hidden {
  opacity: 0;
  transform: translateY(-10px);
  pointer-events: none;
}

#errorMessage:not(.hidden) {
  opacity: 1;
  transform: translateY(0);
  animation: shake 0.5s ease-in-out;
}

/* Loading Animation */
.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(59, 130, 246, 0.2),
    transparent
  );
  animation: loading 1.5s infinite;
}

/* Animations */
@keyframes loading {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
}

/* File Upload Animation */
.file-upload-animation {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.2);
  }
  70% {
    box-shadow: 0 0 0 15px rgba(59, 130, 246, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0);
  }
}

/* Fancy Select Styling */
select:hover {
  border-color: #3b82f6;
}

/* Button Animations */
#compressBtn:active,
#downloadLink:active {
  transform: translateY(0);
}

/* Result Section Animation */
#result {
  transition: all 0.5s ease-in-out;
  opacity: 0;
  transform: translateY(20px);
}

#result.show {
  opacity: 1;
  transform: translateY(0);
}

/* Image comparison container styles */
#imageComparisonContainer {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s ease-in-out;
}

#imageComparisonContainer:not(.hidden) {
  opacity: 1;
  transform: translateY(0);
}

/* Card Hover Effects */
.bg-white {
  transition: all 0.3s ease-in-out;
  border-radius: 12px;
}

.bg-white:hover {
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 8px 10px -6px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

/* Media Queries */
@media (max-width: 1024px) {
  .max-w-4xl {
    padding: 0 1.5rem;
  }

  #imageComparisonContainer .grid {
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .max-w-4xl {
    padding: 1rem;
    margin: 0;
    width: 100%;
  }

  #imageComparisonContainer .grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  #preview,
  #compressedPreview {
    max-height: 250px;
    width: 100%;
    object-fit: contain;
  }

  h1.text-4xl {
    font-size: 1.75rem;
    margin-bottom: 1rem;
  }

  .bg-white {
    padding: 1rem !important;
    margin-bottom: 1rem;
  }

  /* Improve touch targets */
  select,
  input[type="text"],
  input[type="number"] {
    height: 48px;
    font-size: 16px; /* Prevents iOS zoom on focus */
  }

  #compressBtn,
  #downloadLink {
    width: 100%;
    text-align: center;
    padding: 0.875rem;
    font-size: 1rem;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* Better spacing for controls */
  .space-y-4 {
    margin-bottom: 1.5rem;
  }

  /* Adjust upload zone for mobile */
  label[for="imageInput"] {
    padding: 1rem !important;
  }

  .zoom-controls {
    bottom: 8px;
  }

  #zoomPercentage {
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .max-w-4xl {
    padding: 0.75rem;
  }

  h1.text-4xl {
    font-size: 1.5rem;
  }

  #preview,
  #compressedPreview {
    max-height: 200px;
  }

  .bg-white {
    padding: 0.75rem !important;
  }

  /* Stack file size info and download button */
  #result {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  #fileSizes {
    text-align: center;
  }
}

/* Improve form elements spacing */
.mb-6 {
  margin-bottom: 1rem;
}

/* Ensure proper button touch targets */
button,
select,
input {
  touch-action: manipulation;
}

/* Drag and Drop Styles */
.upload-message {
  transition: all 0.3s ease;
}

.drag-over .upload-message {
  color: #3b82f6;
}

/* Invalid File Warning */
.invalid-file-warning {
  position: absolute;
  bottom: -40px;
  left: 0;
  right: 0;
  text-align: center;
  color: #ef4444;
  font-size: 0.875rem;
  padding: 0.5rem;
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.3s ease;
}

.invalid-file-warning.show {
  opacity: 1;
  transform: translateY(0);
}

/* Zoom Modal Styles */
#zoomModal {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

#zoomModal.active {
  opacity: 1;
  pointer-events: auto;
  cursor: grab;
}

#zoomModal.active.grabbing {
  cursor: grabbing;
}

/* Fix the centering issue */
.zoom-container {
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

#zoomImage {
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s ease;
  transform-origin: center;
  display: block;
  margin: 0 auto; /* Center horizontally */
  max-width: 100%;
  max-height: 85vh;
  object-fit: contain;
}

#closeZoomBtn {
  opacity: 0.8;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 60;
}

#closeZoomBtn:hover {
  opacity: 1;
  transform: scale(1.1);
}

/* Zoom Indicator */
#zoomPercentage {
  position: absolute;
  background-color: rgba(0, 0, 0, 0.6);
  color: white;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 14px;
  pointer-events: none;
  z-index: 55;
  transition: opacity 0.3s ease;
  bottom: 70px; /* Position above the zoom controls */
  left: 50%;
  transform: translateX(-50%);
  opacity: 1; /* Always visible */
}

.zoom-controls {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  background: rgba(0, 0, 0, 0.5);
  padding: 8px 12px;
  border-radius: 8px;
  z-index: 55;
}

.zoom-btn {
  background: white;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.zoom-btn:hover {
  transform: scale(1.1);
  background: #f0f0f0;
}

/* Remove Button */
#removeImageBtn {
  transition: all 0.2s ease;
}

#removeImageBtn:hover {
  transform: translateY(-1px);
}

#removeImageBtn:active {
  transform: translateY(0);
}

/* Progress Bar Styles */
#progressContainer {
  transition: all 0.3s ease;
}

#progressBar {
  transition: width 0.3s ease;
}

/* Responsive styles for progress indicator */
@media (max-width: 768px) {
  #progressContainer {
    padding: 0 0.5rem;
  }

  #progressDetails {
    font-size: 10px;
  }
}

/* Progress animation for the percentage text */
#progressPercentage {
  transition: all 0.2s ease;
}

/* Progress status pulse effect when active */
@keyframes pulse-text {
  0% {
    opacity: 0.8;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0.8;
  }
}

#progressStatus.active {
  animation: pulse-text 1.5s infinite;
}

/* Progress details animated dots when active */
@keyframes dots {
  0%,
  20% {
    content: ".";
  }
  40% {
    content: "..";
  }
  60%,
  100% {
    content: "...";
  }
}

#progressDetails.active::after {
  content: "";
  animation: dots 1.5s infinite;
}