/* ==========================================================================
   Wipey Minimalist & Clean Design System
   ========================================================================== */

:root {
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --bg-card: #fbfdff;
  --border-color: #dbe2ea;
  --border-hover: #cbd5e1;
  --accent-primary: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-subtle: rgba(37, 99, 235, 0.08);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  --success: #16a34a;
  --warning: #d97706;
  --error: #dc2626;
  --surface-overlay: rgba(15, 23, 42, 0.56);
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 20px -12px rgba(15, 23, 42, 0.22);
  --shadow-lg: 0 14px 30px -18px rgba(15, 23, 42, 0.26);
  --font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
}

:root[data-theme='dark'] {
  --bg-primary: #0f172a;
  --bg-surface: #111827;
  --bg-surface-elevated: #172033;
  --bg-card: #0f172a;
  --border-color: #243244;
  --border-hover: #334155;
  --accent-primary: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-subtle: rgba(96, 165, 250, 0.16);
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #020617;
  --success: #34d399;
  --warning: #fbbf24;
  --error: #f87171;
  --surface-overlay: rgba(2, 6, 23, 0.7);
  --shadow-sm: 0 1px 2px 0 rgba(2, 6, 23, 0.45);
  --shadow-md: 0 12px 20px -12px rgba(2, 6, 23, 0.6);
  --shadow-lg: 0 18px 40px -20px rgba(2, 6, 23, 0.72);
}

/* Reset & Global Overflow Fix */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

img {
  display: block;
  max-width: 100%;
}

html, body {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden !important;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  height: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Focus States */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* App Container */
.app-container {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Header & Navbar */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
  gap: 0.75rem;
  flex-wrap: wrap;
  min-width: 0;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  min-width: 0;
}

.brand-icon {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  border: 1px solid rgba(37, 99, 235, 0.16);
  border-radius: var(--radius-sm);
  color: var(--accent-primary);
}

.brand-icon svg {
  width: 18px;
  height: 18px;
}

.brand-logo-img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.brand-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

.theme-toggle-label {
  font-size: 0.82rem;
  font-weight: 600;
}

.badge-credits {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--accent-subtle);
  border: 1px solid rgba(2, 132, 199, 0.3);
  color: #38bdf8;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
}

/* Hero Section */
.hero {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 2rem;
  padding: 0 0.25rem;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.35rem 0.8rem;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 1rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(1.8rem, 3.5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.85rem;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.hero-title span {
  color: #38bdf8;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 560px;
  margin: 0 auto;
}

/* Cards & Layout */
.main-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.agreement-card {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
}

.custom-checkbox {
  width: 18px;
  height: 18px;
  min-width: 18px;
  margin-top: 2px;
  accent-color: var(--accent-primary);
  cursor: pointer;
}

.agreement-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  line-height: 1.5;
}

.agreement-link {
  color: var(--accent-primary);
  text-decoration: underline;
  cursor: pointer;
}

.agreement-link:hover {
  color: var(--accent-hover);
}

/* Dropzone */
.dropzone {
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.25rem 1.25rem;
  text-align: center;
  background: var(--bg-card);
  cursor: pointer;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
}

.dropzone:hover:not(.disabled), .dropzone.dragover:not(.disabled) {
  border-color: var(--accent-primary);
  background: var(--bg-surface-elevated);
}

.dropzone.disabled {
  opacity: 0.7;
  cursor: not-allowed;
  border-color: var(--border-color);
  background: var(--bg-surface-elevated);
}

.dropzone-icon {
  width: 42px;
  height: 42px;
  color: var(--accent-primary);
  margin-bottom: 0.9rem;
}

.dropzone.disabled .dropzone-icon {
  color: var(--text-muted);
}

.dropzone-status {
  margin-top: 0.8rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.dropzone.disabled .dropzone-status {
  color: var(--warning);
}

.brand-logo-img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.dropzone-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  color: var(--text-primary);
}

.dropzone-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.upload-notice-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--warning);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.25);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.format-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

/* Transparency Accordion Box */
.transparency-box {
  margin-top: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.transparency-header {
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.transparency-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.transparency-content {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.transparency-content ul {
  padding-left: 1.25rem;
  margin-top: 0.5rem;
}

.transparency-content li {
  margin-bottom: 0.35rem;
}

/* Image Preview & Result Workspace */
.workspace-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 768px) {
  .comparison-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.image-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 320px;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.image-card-header {
  padding: 0.8rem 1rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.image-card-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: rgba(239, 68, 68, 0.15);
  color: var(--error);
  border-color: var(--error);
}

.image-viewport {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 1rem;
  background: var(--bg-surface-elevated);
  min-height: 220px;
  transition: background-color var(--transition-normal);
}

.preview-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

/* Skeleton Loader */
.skeleton-box {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--bg-surface-elevated) 0%, var(--border-color) 50%, var(--bg-surface-elevated) 100%);
  border-radius: var(--radius-sm);
}

/* Loading Overlay */
.loading-overlay {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--bg-surface) 85%, transparent);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 10;
  backdrop-filter: blur(6px);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(2, 132, 199, 0.2);
  border-left-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Action Controls Bar */
.actions-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-primary);
  color: var(--text-inverse);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--border-hover);
}

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

.btn-success:hover:not(:disabled) {
  filter: brightness(1.1);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Toast Notifications Container */
.toast-container {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  z-index: 1000;
  pointer-events: none;
  max-width: calc(100vw - 2.5rem);
}

.toast {
  pointer-events: auto;
  width: 340px;
  max-width: 100%;
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  color: var(--text-primary);
  font-size: 0.88rem;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.toast-error {
  border-left: 4px solid var(--error);
}

.toast-success {
  border-left: 4px solid var(--success);
}

.toast-info {
  border-left: 4px solid var(--accent-primary);
}

/* Simplified Modal Dialog - Only Bottom Close Button */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--surface-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.modal-header {
  padding: 1.1rem 1.35rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-body {
  padding: 1.35rem;
  overflow-y: auto;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

.modal-body h2, .modal-body h3 {
  color: var(--text-primary);
  margin: 1rem 0 0.5rem;
  font-size: 1rem;
}

.modal-body p {
  margin-bottom: 0.85rem;
}

.modal-footer {
  padding: 0.85rem 1.35rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
}

/* Footer */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding: 1.75rem 1.25rem;
  background: var(--bg-surface);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-content {
  max-width: 1040px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  text-align: center;
}

@media (max-width: 640px) {
  .app-container {
    padding: 1rem 0.9rem 2rem;
  }

  .navbar {
    padding: 0.85rem 0.9rem;
  }

  .brand-name {
    font-size: 1.08rem;
  }

  .main-card {
    padding: 1rem;
  }

  .dropzone {
    padding: 1.6rem 1rem;
  }

  .hero {
    margin-bottom: 1.4rem;
  }

  .toast-container {
    right: 0.75rem;
    left: 0.75rem;
    top: 0.75rem;
    max-width: none;
  }

  .toast {
    width: 100%;
  }
}

@media (min-width: 640px) {
  .footer-content {
    flex-direction: row;
    text-align: left;
  }
}

.footer-text {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-text a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-primary);
}

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

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 999px;
}

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

/* Utility Classes */
.hidden {
  display: none !important;
}