/* ============================================
   Pablito Leans — Design System
   Escáner Web Documental
   ============================================ */

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

/* ---------- Design Tokens ---------- */
:root {
  /* Background */
  --bg-primary: #07070d;
  --bg-secondary: #0e0e18;
  --bg-surface: rgba(255, 255, 255, 0.04);
  --bg-surface-hover: rgba(255, 255, 255, 0.08);
  --bg-surface-active: rgba(255, 255, 255, 0.12);

  /* Accent */
  --accent: #00D4FF;
  --accent-dark: #009ec2;
  --accent-glow: rgba(0, 212, 255, 0.25);
  --accent-glow-strong: rgba(0, 212, 255, 0.5);
  --accent-gradient: linear-gradient(135deg, #00D4FF 0%, #7B61FF 100%);

  /* Text */
  --text-primary: #F0F0F5;
  --text-secondary: #8888A0;
  --text-muted: #55556A;

  /* Semantic */
  --success: #00E676;
  --success-bg: rgba(0, 230, 118, 0.1);
  --warning: #FFAB40;
  --warning-bg: rgba(255, 171, 64, 0.1);
  --danger: #FF5252;
  --danger-bg: rgba(255, 82, 82, 0.1);

  /* Radii */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--accent-glow);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Glass */
  --glass-bg: rgba(14, 14, 24, 0.75);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-blur: blur(20px);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle animated background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 212, 255, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(123, 97, 255, 0.06), transparent);
  pointer-events: none;
  z-index: 0;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
  color: inherit;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-surface-hover);
  border-radius: var(--radius-full);
}

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

/* ============================================
   HEADER
   ============================================ */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
}

.app-logo {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 8px var(--accent-glow));
}

.app-title {
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.app-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: auto;
  display: none;
}

@media (min-width: 768px) {
  .app-subtitle { display: block; }
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  position: relative;
  z-index: 1;
}

/* ============================================
   UPLOAD ZONE
   ============================================ */
.upload-zone {
  width: 100%;
  max-width: 600px;
  aspect-ratio: 4 / 3;
  border: 2px dashed var(--text-muted);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  cursor: pointer;
  transition: border-color var(--transition-normal), background var(--transition-normal), transform var(--transition-normal);
  background: var(--bg-surface);
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--accent);
  background: var(--bg-surface-hover);
  transform: scale(1.01);
}

.upload-zone:hover::before,
.upload-zone.drag-over::before {
  opacity: 0.04;
}

.upload-zone__icon {
  width: 72px;
  height: 72px;
  color: var(--text-muted);
  transition: color var(--transition-normal), transform var(--transition-normal);
}

.upload-zone:hover .upload-zone__icon {
  color: var(--accent);
  transform: translateY(-4px);
}

.upload-zone__text {
  text-align: center;
}

.upload-zone__text h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.upload-zone__text p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.upload-zone__input {
  display: none;
}

.upload-zone__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: var(--accent-gradient);
  color: #000;
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-full);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  z-index: 1;
}

.upload-zone__btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* ============================================
   EDITOR ZONE
   ============================================ */
.editor-zone {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.editor-main {
  width: 100%;
  display: flex;
  justify-content: center;
}

.editor-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  width: 100%;
}

.canvas-wrapper {
  position: relative;
  width: 100%;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--glass-border);
}

.canvas-wrapper canvas {
  display: block;
  width: 100%;
  height: auto;
}

/* Overlay canvas for corner handles */
.canvas-overlay {
  position: absolute;
  inset: 0;
  cursor: crosshair;
}

.editor-hint {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-surface);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
}

.editor-hint__icon {
  width: 16px;
  height: 16px;
  color: var(--accent);
  flex-shrink: 0;
}

/* ============================================
   RESULT ZONE
   ============================================ */
.result-zone {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.result-main {
  width: 100%;
  display: flex;
  justify-content: center;
}

.result-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  width: 100%;
}

.result-canvas-wrapper {
  position: relative;
  width: 100%;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--glass-border);
}

.result-canvas-wrapper canvas {
  display: block;
  width: 100%;
  height: auto;
}

.result-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--success-bg);
  border: 1px solid rgba(0, 230, 118, 0.2);
  border-radius: var(--radius-full);
  color: var(--success);
  font-size: 0.8125rem;
  font-weight: 500;
}

/* Result top row: badge + page counter */
.result-top-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  width: 100%;
  flex-wrap: wrap;
}

.page-counter {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ============================================
   PAGES STRIP (Multi-page thumbnails)
   ============================================ */
.pages-strip {
  width: 100%;
  max-width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
}

.pages-strip__list {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  scroll-snap-type: x mandatory;
  padding: var(--space-xs) 0;
}

.pages-strip__list::-webkit-scrollbar {
  display: none;
}

.page-thumb {
  position: relative;
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid transparent;
  cursor: grab;
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  background: var(--bg-secondary);
  scroll-snap-align: start;
}

.page-thumb:active {
  cursor: grabbing;
}

.page-thumb.dragging {
  opacity: 0.5;
  transform: scale(0.95);
}

.page-thumb.drag-over {
  border-color: var(--accent);
  transform: scale(1.05);
}

.page-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

.page-thumb:hover {
  border-color: var(--text-muted);
  transform: scale(1.05);
}

.page-thumb.active {
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.page-thumb__label {
  position: absolute;
  bottom: 2px;
  right: 2px;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  border-radius: 50%;
  font-size: 0.625rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* ============================================
   CONTROLS PANEL
   ============================================ */
.controls-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--glass-border);
  flex-wrap: wrap;
}

/* Padding to prevent main content from hiding behind fixed mobile controls */
body {
  padding-bottom: 80px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Primary */
.btn-primary {
  background: var(--accent-gradient);
  color: #000;
  box-shadow: 0 2px 12px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--accent-glow-strong);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

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

.btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: var(--text-muted);
  transform: translateY(-1px);
}

/* Danger */
.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid rgba(255, 82, 82, 0.2);
}

.btn-danger:hover {
  background: rgba(255, 82, 82, 0.15);
  transform: translateY(-1px);
}

/* Icon-only */
.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
}

.btn-icon:hover {
  background: var(--bg-surface-hover);
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

/* ============================================
   LOADER OVERLAY
   ============================================ */
.loader-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  background: var(--bg-primary);
  transition: opacity var(--transition-slow);
}

.loader-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loader-spinner {
  width: 56px;
  height: 56px;
  border: 3px solid var(--bg-surface-hover);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loader-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: center;
}

.loader-text strong {
  display: block;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

/* Progress bar for loader */
.loader-progress {
  width: 200px;
  height: 4px;
  background: var(--bg-surface);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.loader-progress__bar {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  width: 30%;
  animation: loader-progress 2s ease-in-out infinite;
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
  pointer-events: auto;
  animation: toast-in var(--transition-normal) forwards;
  max-width: 360px;
}

.toast.toast-out {
  animation: toast-out var(--transition-normal) forwards;
}

.toast--success { border-left: 3px solid var(--success); }
.toast--warning { border-left: 3px solid var(--warning); }
.toast--error   { border-left: 3px solid var(--danger); }
.toast--info    { border-left: 3px solid var(--accent); }

.toast__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.toast--success .toast__icon { color: var(--success); }
.toast--warning .toast__icon { color: var(--warning); }
.toast--error .toast__icon   { color: var(--danger); }
.toast--info .toast__icon    { color: var(--accent); }

/* ============================================
   FILTER SELECTOR (bonus for color modes)
   ============================================ */
.filter-selector {
  display: flex;
  gap: var(--space-xs);
  background: var(--bg-surface);
  padding: var(--space-xs);
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  max-width: 100%;
  position: relative;
}

.filter-selector::-webkit-scrollbar {
  display: none;
}

.filter-option {
  padding: 6px 14px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
  scroll-snap-align: start;
}

.filter-option:hover {
  color: var(--text-primary);
}

.filter-option.active {
  background: var(--accent);
  color: #000;
  box-shadow: 0 2px 8px var(--accent-glow);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   KEYFRAME ANIMATIONS
   ============================================ */
@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes loader-progress {
  0%   { width: 10%; margin-left: 0; }
  50%  { width: 60%; margin-left: 20%; }
  100% { width: 10%; margin-left: 90%; }
}

@keyframes toast-in {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

@keyframes toast-out {
  from { transform: translateX(0);    opacity: 1; }
  to   { transform: translateX(100%); opacity: 0; }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow-strong); }
  50%      { box-shadow: 0 0 0 10px transparent; }
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes corner-pulse {
  0%, 100% { transform: scale(1);   opacity: 1; }
  50%      { transform: scale(1.3); opacity: 0.7; }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 480px) {
  .app-header {
    padding: var(--space-sm) var(--space-md);
  }

  .app-title {
    font-size: 1.05rem;
  }

  .app-main {
    padding: var(--space-md);
  }

  .upload-zone {
    aspect-ratio: 3 / 3.5;
  }

  .btn {
    padding: 8px 12px;
    font-size: 0.75rem;
    gap: var(--space-xs);
  }

  .page-thumb {
    width: 56px;
    height: 56px;
  }

  .page-thumb__label {
    width: 16px;
    height: 16px;
    font-size: 0.5625rem;
  }
}

@media (min-width: 1024px) {
  .app-main {
    padding: var(--space-2xl);
  }

  .upload-zone {
    max-width: 680px;
  }
}