/* Design Tokens & Theme Variables (TinyPNG Inspired) */
:root {
  --bg-color: #f3f7f4;
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --text-primary: #2d3748;
  --text-secondary: #718096;
  --text-muted: #a0aec0;
  
  --primary: #4caf50;          /* TinyPNG leaf green */
  --primary-hover: #3d8b40;
  --primary-glow: rgba(76, 175, 80, 0.2);
  
  --secondary: #0ea5e9;
  --secondary-glow: rgba(14, 165, 233, 0.15);
  
  --accent-brown: #3e2723;    /* Panda dark brown/black */
  --accent-light: #e8f5e9;
  --error: #e53e3e;
  --success: #38a169;
  
  --font-main: 'Inter', sans-serif;
  --font-display: 'Outfit', sans-serif;
  --border-radius: 20px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Global Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  padding-top: 70px; /* Offset for fixed top navbar */
}

/* Top Navigation Bar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 70px;
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--card-border);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: 0 1.5rem;
}

.nav-container {
  width: 100%;
  max-width: 1000px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--accent-brown);
}

.nav-logo-icon {
  font-size: 1.75rem;
  color: var(--primary);
}

.nav-logo h1 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
}

.nav-logo h1 span {
  color: var(--primary);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.5rem 1rem;
  border-radius: 30px;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary);
  background-color: var(--accent-light);
}

.nav-link.active {
  color: #ffffff;
  background-color: var(--primary);
  box-shadow: 0 4px 10px var(--primary-glow);
}

/* App Layout Container */
.app-container {
  width: 100%;
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

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

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0.5rem auto 0;
}

/* Modal Overlay (Backdrop) and Content (Right Off-Canvas Sidebar) */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0);
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  display: flex;
  justify-content: flex-end; /* Align sidebar to the right */
  align-items: stretch; /* Stretch sidebar vertically to occupy full height */
  z-index: 2000;
  transition: background 0.3s ease, backdrop-filter 0.3s ease, -webkit-backdrop-filter 0.3s ease;
}

.modal-overlay.hidden {
  display: none !important;
}

/* When the modal overlay is shown, animate the backdrop */
.modal-overlay.show {
  background: rgba(15, 23, 42, 0.35);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.modal-content {
  width: 100%;
  max-width: 500px; /* Sidebar width */
  height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  background: var(--card-bg);
  border-left: 1px solid var(--card-border);
  padding: 2.5rem 2rem 2rem;
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.08);
  transform: translateX(100%); /* Slide out to the right */
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}

/* When the overlay is shown, slide the sidebar in */
.modal-overlay.show .modal-content {
  transform: translateX(0);
}

.close-modal-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: none;
  background: #f1f5f9;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.95rem;
  z-index: 10;
}

.close-modal-btn:hover {
  background: #fee2e2;
  color: var(--error);
  transform: rotate(90deg);
}

@keyframes modal-zoom {
  from { transform: scale(0.92); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* Main Cards */
.main-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.glass-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.04), 0 5px 15px rgba(0, 0, 0, 0.02);
  transition: var(--transition);
}

.glass-card:hover {
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.06), 0 8px 20px rgba(0, 0, 0, 0.03);
}

/* Drag and Drop Zone */
.drop-zone {
  border: 2px dashed #b2dfdb;
  background-color: #fafdfb;
  border-radius: 14px;
  padding: 4.5rem 2rem;
  text-align: center;
  position: relative;
  cursor: pointer;
  transition: var(--transition);
}

.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--primary);
  background-color: var(--accent-light);
}

.file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 5;
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  pointer-events: none;
}

.upload-icon-wrapper {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: #e0f2f1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  transition: var(--transition);
}

.drop-zone:hover .upload-icon-wrapper,
.drop-zone.drag-over .upload-icon-wrapper {
  background: #c8e6c9;
  transform: translateY(-5px);
}

.upload-icon {
  font-size: 3.5rem;
  color: var(--primary);
}

.drop-zone h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-brown);
}

.browse-btn {
  color: var(--primary);
  font-weight: 700;
  text-decoration: underline;
}

.file-limits {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Results section styling */
.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
}

.results-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.results-title i {
  font-size: 1.25rem;
  color: var(--primary);
}

.results-title h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-brown);
}

.file-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  flex: 1;
  overflow-y: auto;
  padding-right: 0.25rem;
}

/* Custom Scrollbar for list */
.file-list::-webkit-scrollbar {
  width: 6px;
}

.file-list::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 3px;
}

.file-list::-webkit-scrollbar-thumb {
  background: #c1c1c1;
  border-radius: 3px;
}

.file-list::-webkit-scrollbar-thumb:hover {
  background: #a8a8a8;
}

/* File list item row */
.file-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  background: #fafbfc;
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 0.9rem 1.2rem;
  transition: var(--transition);
}

.file-item:hover {
  background: #f3f7f4;
  border-color: #cbd5e0;
}

.file-icon {
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--text-secondary);
  background: #edf2f7;
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--card-border);
}

.file-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.file-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
}

.file-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent-brown);
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

.file-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.arrow-divider {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.saving-percent {
  color: var(--success);
  font-weight: 700;
  background: var(--accent-light);
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
  border: 1px solid #c8e6c9;
}

.saving-percent.error {
  color: var(--error);
  background: #fff5f5;
  border-color: #fed7d7;
}

.file-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Status markers */
.status-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid transparent;
  flex-shrink: 0;
}

.status-badge.pending {
  background: #edf2f7;
  color: var(--text-secondary);
  border-color: var(--card-border);
}

.status-badge.converting {
  background: #fffbeb;
  color: #d97706;
  border-color: #fef3c7;
}

.status-badge.converting i {
  animation: spin 1s linear infinite;
}

.status-badge.success {
  background: var(--accent-light);
  color: var(--success);
  border-color: #c8e6c9;
}

.status-badge.error {
  background: #fff5f5;
  color: var(--error);
  border-color: #fed7d7;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.7rem 1.4rem;
  border-radius: 30px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 10px var(--primary-glow);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 15px var(--primary-glow);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary-text {
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 0.4rem 0.8rem;
}

.btn-secondary-text:hover {
  color: var(--error);
  background: #fff5f5;
  border-radius: 8px;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 50%;
}

.btn-download {
  background: var(--accent-light);
  color: var(--primary);
  border: 1px solid #c8e6c9;
}

.btn-download:hover {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 10px var(--primary-glow);
}

.btn-delete {
  background: transparent;
  color: var(--text-muted);
}

.btn-delete:hover {
  color: var(--error);
  background: #fff5f5;
}

/* Results Footer */
.results-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--card-border);
  padding-top: 1.5rem;
  margin-top: 1.5rem;
}

.summary-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.summary-files {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.summary-savings {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-brown);
}

.saving-badge {
  color: #ffffff;
  background: var(--primary);
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  font-weight: 800;
  display: inline-block;
  margin-left: 0.35rem;
  box-shadow: 0 4px 8px var(--primary-glow);
}

/* Progress Container & Phases */
.progress-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
  width: 100%;
}

.progress-phase {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.progress-text {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: #edf2f7;
  border-radius: 3px;
  overflow: hidden;
  position: relative;
}

.bar-fill {
  height: 100%;
  border-radius: 3px;
}

.upload-fill {
  width: 0%;
  background: linear-gradient(90deg, var(--secondary), #0284c7);
  transition: width 0.1s ease-out;
}

.convert-fill {
  width: 100%;
  background: linear-gradient(90deg, var(--primary), #81c784);
}

/* Indeterminate animation for conversion bar */
.convert-fill.indeterminate {
  width: 40%;
  position: absolute;
  top: 0;
  left: -40%;
  animation: indeterminate-loading 1.5s infinite linear;
  box-shadow: 0 0 8px var(--primary-glow);
}

@keyframes indeterminate-loading {
  0% {
    left: -40%;
  }
  50% {
    left: 100%;
  }
  100% {
    left: 100%;
  }
}

/* Helper Class */
.hidden {
  display: none !important;
}

/* App Footer */
.app-footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: auto;
  padding: 2rem 0;
  border-top: 1px solid var(--card-border);
  background-color: var(--card-bg);
  width: 100%;
}

/* Animations */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

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

.file-item {
  animation: fadeIn 0.35s ease-out forwards;
}

/* Empty state styling */
.history-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
  gap: 0.75rem;
  text-align: center;
  width: 100%;
}

.history-empty-state .empty-icon {
  font-size: 2.25rem;
  color: var(--text-muted);
  opacity: 0.4;
}

.history-empty-state p {
  font-size: 0.95rem;
  font-weight: 500;
}

/* Responsive adjustments */
@media (max-width: 600px) {
  body {
    padding-top: 60px;
  }
  .navbar {
    height: 60px;
  }
  .nav-links {
    gap: 0.5rem;
  }
  .nav-link {
    font-size: 0.85rem;
    padding: 0.4rem 0.75rem;
  }
  .app-container {
    padding: 0 1rem;
    margin: 1rem auto;
  }
  .logo h1 {
    font-size: 2rem;
  }
  .subtitle {
    font-size: 1rem;
  }
  .glass-card {
    padding: 1.5rem;
  }
  .file-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    text-align: center;
  }
  .file-info {
    align-items: center;
  }
  .file-actions {
    justify-content: center;
    width: 100%;
  }
  .results-footer {
    flex-direction: column;
    gap: 1.25rem;
    align-items: stretch;
  }
  .summary-info {
    text-align: center;
  }
  .modal-content {
    max-width: 100%;
    border-left: none;
    border-top: 1px solid var(--card-border);
    padding: 2rem 1.25rem 1.5rem;
  }
}