/* === Brand: CSS Variables === */
:root {
  --font-body: 'DM Sans', sans-serif;
  --font-display: 'DM Serif Display', serif;
  --grey-50: #FAFAF9;
  --grey-100: #F5F5F4;
  --grey-200: #E7E5E4;
  --grey-300: #D6D3D1;
  --grey-400: #A8A29E;
  --grey-500: #78716C;
  --grey-600: #57534E;
  --grey-800: #292524;
  --grey-900: #1C1917;
  --grey-950: #0F0F0F;
  --pink: #FF2867;
  --bg: var(--grey-50);
  --surface: #FFFFFF;
  --text: var(--grey-900);
  --text-muted: var(--grey-600);
  --border: var(--grey-200);
  --accent: var(--pink);
  --accent-hover: #E6164F;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --ease-out-quart: cubic-bezier(.165,.84,.44,1);
  --ease-in-out-cubic: cubic-bezier(.645,.045,.355,1);
  --dur-1: 120ms;
  --dur-2: 180ms;
  --dur-3: 240ms;
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --sidebar-width: 220px;
  --sidebar-collapsed-width: 60px;
}

:root.dark {
  --bg: var(--grey-950);
  --surface: var(--grey-900);
  --text: var(--grey-50);
  --text-muted: var(--grey-400);
  --border: var(--grey-800);
  --accent-hover: #FF5088;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.4);
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.2; font-weight: 600; }
h1 { font-family: var(--font-display); font-weight: 400; font-size: 2.5rem; }
h2 { font-size: 1.5rem; }

a { color: var(--accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--text); }

button, .btn {
  font-family: var(--font-body);
  font-weight: 500;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  font-size: 0.9375rem;
}

.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--text-muted); }
.btn-full { width: 100%; display: block; text-align: center; }

input, textarea, select {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  transition: border-color var(--transition-fast);
  width: 100%;
}
input:focus, textarea:focus { outline: none; border-color: var(--accent); }
textarea { resize: vertical; }

.text-muted { color: var(--text-muted); }
.text-sm { font-size: 0.875rem; }

/* === Toggle === */
.toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-muted);
}
.toggle input[type="checkbox"] {
  appearance: none;
  width: 40px; height: 22px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--grey-300);
  position: relative;
  cursor: pointer;
  flex-shrink: 0;
}
.toggle input[type="checkbox"]:checked { background: var(--accent); }
.toggle input[type="checkbox"]::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 18px; height: 18px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition-fast);
  border: none;
}
.toggle input[type="checkbox"]:checked::after { transform: translateX(18px); }

/* === Layout === */
.app-content {
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--space-xl);
  max-width: 800px;
  margin: 0 auto;
}

.sidebar ~ .app-content {
  margin-left: var(--sidebar-collapsed-width);
}

.app-content:has(.auth-view) {
  max-width: none;
  padding: 0;
  margin-left: 0;
}

/* === Sidebar === */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-width);
  height: 100dvh;
  display: grid;
  grid-template-columns: var(--sidebar-collapsed-width) 1fr;
  overflow: clip;
  isolation: isolate;
  pointer-events: none;
  z-index: 200;
}

.sidebar-icons, .sidebar-labels { pointer-events: auto; }

.sidebar-icons {
  grid-column: 1;
  display: grid;
  grid-template-rows: 56px 1fr auto;
  background: var(--surface);
  box-shadow: 1px 0 0 0 var(--border);
  contain: strict;
  will-change: transform;
  transform: translateZ(0);
  z-index: 2;
}

.sidebar-labels {
  grid-column: 2;
  display: grid;
  grid-template-rows: 56px 1fr auto;
  background: var(--surface);
  box-shadow: 1px 0 0 0 var(--border);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  overflow: hidden;
  transform: translateX(0);
  opacity: 1;
  transition: transform 240ms var(--ease-out-quart), opacity 200ms ease;
  will-change: transform, opacity;
  contain: layout style paint;
  z-index: 1;
}

.sidebar.collapsed .sidebar-labels {
  transform: translateX(-100%);
  opacity: 0;
  pointer-events: none;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 48px; height: 48px;
  margin: 0 auto;
  border: none; background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  cursor: pointer; padding: 0;
}
.icon-btn:hover { color: var(--text); background: var(--grey-100); }
:root.dark .icon-btn:hover { background: var(--grey-800); }
.icon-btn.active { color: var(--accent); }
.icon-btn svg { width: 20px; height: 20px; }

.toggle-btn { transition: transform var(--dur-3) var(--ease-out-quart); }
.sidebar.collapsed .toggle-btn { transform: rotate(180deg); }

.sidebar-header, .labels-header {
  display: grid;
  place-items: center;
  height: 56px;
}

.sidebar-nav, .labels-nav { padding: var(--space-sm) 0; }
.sidebar-actions, .labels-actions { padding: var(--space-sm) 0; border-top: 1px solid var(--border); }

.label-btn {
  display: block;
  width: 100%;
  padding: var(--space-sm) var(--space-lg);
  text-align: left;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.875rem;
  font-family: var(--font-body);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}
.label-btn:hover { color: var(--text); background: var(--grey-100); }
:root.dark .label-btn:hover { background: var(--grey-800); }
.label-btn.active { color: var(--accent); }

.pb-admin-link { text-decoration: none; }

.brand-name {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.125rem;
  color: var(--text);
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 199;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-3) var(--ease-out-quart);
}
.sidebar-backdrop.visible { opacity: 1; pointer-events: auto; }

@media (max-width: 767px) {
  .sidebar { transform: translateX(calc(-1 * var(--sidebar-width))); transition: transform var(--dur-3) var(--ease-out-quart); }
  .sidebar.expanded { transform: translateX(0); }
  .sidebar.expanded .sidebar-labels { transform: translateX(0); opacity: 1; pointer-events: auto; }
  .sidebar ~ .app-content { margin-left: 0; }
}

/* === Auth Views === */
.auth-view {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--space-xl);
  background: var(--bg);
}

.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl) var(--space-2xl);
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.auth-subtitle { color: var(--text-muted); margin-top: var(--space-sm); margin-bottom: var(--space-2xl); }

.auth-form { display: flex; flex-direction: column; gap: var(--space-lg); text-align: left; }
.auth-form .form-group { display: flex; flex-direction: column; gap: var(--space-xs); }
.auth-form label { font-size: 0.875rem; font-weight: 500; color: var(--text-muted); }

.form-error { color: var(--accent); font-size: 0.875rem; }

.auth-link { margin-top: var(--space-lg); font-size: 0.875rem; color: var(--text-muted); }

.approval-message {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  padding: var(--space-xl) 0;
  color: var(--text-muted);
}

/* === Home View === */
.home-view { padding-top: var(--space-lg); }
.home-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-2xl); gap: var(--space-md); flex-wrap: wrap; }
.section-title { font-size: 1.25rem; font-weight: 600; }

.edit-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.edit-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}
.edit-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.edit-card-images { display: grid; grid-template-columns: 1fr 1fr; }
.edit-card-images img { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; }

.edit-card-info { padding: var(--space-md); }
.edit-prompt { font-size: 0.875rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* === New Image View === */
.new-image-view { padding-top: var(--space-lg); }

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  cursor: pointer;
}
.drop-zone.drag-over { border-color: var(--accent); background: rgba(255,40,103,0.05); }
.drop-zone-content { display: flex; flex-direction: column; align-items: center; gap: var(--space-md); }
.drop-icon { width: 48px; height: 48px; color: var(--text-muted); }
.upload-btn { cursor: pointer; }

.preview-section { display: flex; flex-direction: column; gap: var(--space-xl); }
.preview-image-wrap { position: relative; }
.preview-image { width: 100%; max-height: 50vh; object-fit: contain; border-radius: var(--radius-lg); background: var(--grey-100); display: block; }
:root.dark .preview-image { background: var(--grey-800); }
.btn-remove {
  position: absolute;
  top: var(--space-sm); right: var(--space-sm);
  width: 32px; height: 32px;
  border-radius: var(--radius-full);
  background: rgba(0,0,0,0.6);
  color: white;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  padding: 0;
}

.prompt-form { display: flex; flex-direction: column; gap: var(--space-md); }
.form-group { display: flex; flex-direction: column; gap: var(--space-xs); }
.form-group label { font-size: 0.875rem; font-weight: 500; color: var(--text-muted); }

.loading-bar {
  height: 4px;
  background: var(--grey-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--space-sm);
}
.loading-bar-inner {
  height: 100%;
  background: var(--accent);
  border-radius: var(--radius-full);
  animation: loading-slide 2s ease-in-out infinite;
}
@keyframes loading-slide {
  0% { width: 0; margin-left: 0; }
  50% { width: 60%; margin-left: 20%; }
  100% { width: 0; margin-left: 100%; }
}

/* === Result View === */
.result-view { padding-top: var(--space-lg); }

.compare-container {
  position: relative;
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: col-resize;
  user-select: none;
  touch-action: none;
}
.compare-img { width: 100%; display: block; max-height: 60vh; object-fit: contain; }
.compare-result { position: absolute; inset: 0; }
.compare-slider {
  position: absolute;
  top: 0; bottom: 0;
  width: 3px;
  background: white;
  transform: translateX(-50%);
  pointer-events: none;
}
.compare-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 36px; height: 36px;
  background: white;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  display: grid;
  place-items: center;
}
.compare-handle::before {
  content: '\2194';
  font-size: 1.25rem;
  color: var(--grey-600);
}
.compare-label {
  position: absolute;
  top: var(--space-md);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(0,0,0,0.5);
  color: white;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}
.compare-label-left { left: var(--space-md); }
.compare-label-right { right: var(--space-md); }

.result-prompt { margin-top: var(--space-lg); font-size: 0.9375rem; }
.result-actions { display: flex; gap: var(--space-md); margin-top: var(--space-lg); flex-wrap: wrap; }
.refine-section { margin-top: var(--space-lg); }

/* === History View === */
.history-view { padding-top: var(--space-lg); }

.history-list { display: flex; flex-direction: column; gap: var(--space-md); }
.history-item {
  display: flex;
  gap: var(--space-md);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  cursor: pointer;
  transition: box-shadow var(--transition-fast);
  align-items: center;
}
.history-item:hover { box-shadow: var(--shadow-md); }

.history-thumbs {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}
.history-thumbs img {
  width: 64px; height: 64px;
  object-fit: cover;
  border-radius: var(--radius-md);
}
.history-arrow { color: var(--text-muted); font-size: 1.25rem; }
.history-info { flex: 1; min-width: 0; }
.history-prompt { font-size: 0.875rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* === Admin View === */
.admin-view { padding-top: var(--space-lg); }
.user-list { display: flex; flex-direction: column; gap: var(--space-md); }
.user-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  gap: var(--space-md);
}
.user-name { font-weight: 500; }

/* === States === */
.loading-state, .empty-state {
  text-align: center;
  padding: var(--space-3xl) var(--space-xl);
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

/* === Reduced Motion === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}