/* ==========================================================================
   ATELIER / PRINT & EDITORIAL THEME FOR QRS.CL
   Inspirado en talleres de imprenta, catálogos tipográficos y papelería técnica.
   ========================================================================== */

:root {
  /* Tipografía */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'IBM Plex Mono', 'JetBrains Mono', 'SF Mono', ui-monospace, Menlo, Consolas, monospace;

  /* Paleta: Lienzo Claro (Marfil / Papel cálido) */
  --bg-canvas: #F7F7F5;
  --bg-surface: #FFFFFF;
  --bg-subtle: #F0EFEA;
  --bg-input: #FFFFFF;
  
  --border-color: #E2DFD8;
  --border-subtle: #EAE8E2;
  --border-focus: #191817;
  
  --text-primary: #191817;
  --text-secondary: #5C5852;
  --text-muted: #8A857D;
  
  /* Acento único de taller: Terracota / Naranja artesanal */
  --accent: #D9480F;
  --accent-hover: #BF3C0A;
  --accent-subtle: rgba(217, 72, 15, 0.08);

  /* Botones primarios (Tinta sólida) */
  --btn-primary-bg: #191817;
  --btn-primary-text: #F7F7F5;
  --btn-primary-hover: #33312E;

  /* Corte de papel / Esquinas técnicas */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;

  /* Sombra de hoja de papel (muy seca y tenue) */
  --shadow-paper: 0 1px 2px rgba(25, 24, 23, 0.05), 0 1px 1px rgba(25, 24, 23, 0.02);
  --shadow-dropdown: 0 4px 12px rgba(25, 24, 23, 0.08);

  --transition-fast: 0.15s ease-out;
}

[data-theme="dark"] {
  /* Paleta: Modo Oscuro (Grafito asfáltico cálido) */
  --bg-canvas: #161514;
  --bg-surface: #1E1D1B;
  --bg-subtle: #282624;
  --bg-input: #181716;
  
  --border-color: #33312E;
  --border-subtle: #292825;
  --border-focus: #EDEAE5;
  
  --text-primary: #EDEAE5;
  --text-secondary: #A8A39A;
  --text-muted: #736E66;
  
  --accent: #E8590C;
  --accent-hover: #FF6B22;
  --accent-subtle: rgba(232, 89, 12, 0.12);

  --btn-primary-bg: #EDEAE5;
  --btn-primary-text: #161514;
  --btn-primary-hover: #FFFFFF;

  --shadow-paper: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-dropdown: 0 4px 16px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   HEADER EDITORIAL
   -------------------------------------------------------------------------- */
.app-header {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0.9rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-container {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-title {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1;
}

.brand-dot {
  color: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   HERO / INTRODUCCIÓN EDITORIAL
   -------------------------------------------------------------------------- */
.app-main {
  flex: 1;
  max-width: 1120px;
  width: 100%;
  margin: 0 auto;
  padding: 2.25rem 1.5rem 3.5rem;
}

.hero {
  max-width: 680px;
  margin-bottom: 2.25rem;
}

.hero-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.01em;
  color: var(--accent);
  margin-bottom: 0.5rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.hero-meta::before {
  content: "—";
}

.hero h1 {
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 0.6rem;
}

.hero p {
  color: var(--text-secondary);
  font-size: 0.975rem;
  line-height: 1.55;
}

/* --------------------------------------------------------------------------
   LAYOUT DE DOS COLUMNAS
   -------------------------------------------------------------------------- */
.generator-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 1.75rem;
  align-items: start;
}

@media (max-width: 920px) {
  .generator-grid {
    grid-template-columns: 1fr;
  }
}

/* Tarjeta / Hoja de papel */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  box-shadow: var(--shadow-paper);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.card-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* --------------------------------------------------------------------------
   SEGMENTADOR TIPO TALLER (ATRIBUTOS / ATAJOS)
   -------------------------------------------------------------------------- */
.preset-section {
  margin-bottom: 1.25rem;
}

.preset-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.45rem;
  display: block;
}

.preset-segmented {
  display: flex;
  flex-wrap: wrap;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-subtle);
  padding: 2px;
  gap: 2px;
}

.chip-btn {
  flex: 1;
  min-width: 82px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  white-space: nowrap;
}

.chip-btn:hover {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.chip-btn.active {
  background-color: var(--text-primary);
  color: var(--bg-surface);
  border-color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   FORMULARIO Y ENTRADA DE TEXTO
   -------------------------------------------------------------------------- */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.char-counter {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
}

.textarea-wrapper {
  position: relative;
}

textarea.form-control {
  width: 100%;
  min-height: 108px;
  resize: vertical;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  line-height: 1.5;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-input);
  color: var(--text-primary);
  transition: var(--transition-fast);
}

textarea.form-control:focus,
input[type="text"].form-control:focus,
select.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
}

.clear-btn {
  position: absolute;
  top: 0.65rem;
  right: 0.65rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.2rem;
  display: none;
  border-radius: var(--radius-xs);
}

.clear-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-subtle);
}

.clear-btn.visible {
  display: block;
}

/* --------------------------------------------------------------------------
   AJUSTES VISUALES Y CORRECCIÓN (SECCIÓN TÉCNICA)
   -------------------------------------------------------------------------- */
.options-section {
  margin-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.25rem;
}

.options-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.options-title svg {
  color: var(--accent);
}

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

@media (max-width: 600px) {
  .options-grid {
    grid-template-columns: 1fr;
  }
}

.select-wrapper select {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-input);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.825rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

/* Selectores de color sobrios */
.color-inputs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.color-input-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.5rem;
}

input[type="color"] {
  -webkit-appearance: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xs);
  width: 26px;
  height: 26px;
  cursor: pointer;
  background: transparent;
  padding: 0;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 2px;
}

.color-hex {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Casillas de verificación */
.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.825rem;
  user-select: none;
  color: var(--text-primary);
}

.toggle-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--text-primary);
  cursor: pointer;
  border-radius: var(--radius-xs);
}

/* Rango / Margen */
.range-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.range-container input[type="range"] {
  flex: 1;
  accent-color: var(--text-primary);
  cursor: pointer;
}

.range-val {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  min-width: 16px;
  text-align: right;
}

/* Opciones de texto inferior */
.text-svg-options {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  margin-top: 0.75rem;
}

.text-svg-options.hidden {
  display: none;
}

.text-svg-options input[type="text"].form-control {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xs);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 0.825rem;
}

/* --------------------------------------------------------------------------
   COLUMNA DERECHA: PRUEBA DE IMPRENTA (MARCO CON MARCAS DE CORTE)
   -------------------------------------------------------------------------- */
.preview-card {
  position: sticky;
  top: 5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Soporte de papel con marcas de registro */
.proof-sheet {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.75rem;
  width: 100%;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  position: relative;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

/* Marcas de corte / Crop marks impresas en las esquinas */
.crop-mark {
  position: absolute;
  width: 10px;
  height: 10px;
  pointer-events: none;
}

.crop-top-left {
  top: 8px;
  left: 8px;
  border-top: 1px solid #C5C1B8;
  border-left: 1px solid #C5C1B8;
}

.crop-top-right {
  top: 8px;
  right: 8px;
  border-top: 1px solid #C5C1B8;
  border-right: 1px solid #C5C1B8;
}

.crop-bottom-left {
  bottom: 8px;
  left: 8px;
  border-bottom: 1px solid #C5C1B8;
  border-left: 1px solid #C5C1B8;
}

.crop-bottom-right {
  bottom: 8px;
  right: 8px;
  border-bottom: 1px solid #C5C1B8;
  border-right: 1px solid #C5C1B8;
}

.proof-sheet.transparent-checkered {
  background-image: 
    linear-gradient(45deg, #F0EFEA 25%, transparent 25%), 
    linear-gradient(-45deg, #F0EFEA 25%, transparent 25%), 
    linear-gradient(45deg, transparent 75%, #F0EFEA 75%), 
    linear-gradient(-45deg, transparent 75%, #F0EFEA 75%);
  background-size: 14px 14px;
  background-position: 0 0, 0 7px, 7px -7px, -7px 0px;
}

.qr-svg-container {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-svg-container svg {
  max-width: 100%;
  max-height: 100%;
  display: block;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  gap: 0.5rem;
  text-align: center;
}

.empty-state svg {
  opacity: 0.4;
  color: var(--text-muted);
}

.empty-state p {
  font-size: 0.8rem;
  max-width: 220px;
  line-height: 1.4;
}

.qr-meta-info {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  margin-bottom: 1.25rem;
  text-align: center;
}

/* --------------------------------------------------------------------------
   BOTONES DE ACCIÓN (ESTILO EDITORIAL)
   -------------------------------------------------------------------------- */
.action-buttons {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  text-decoration: none;
  width: 100%;
}

/* Botón primario: Tinta oscura sólida */
.btn-primary {
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border: 1px solid var(--btn-primary-bg);
}

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

/* Botón secundario: Línea fina sobria */
.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--bg-subtle);
  border-color: var(--text-primary);
}

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.btn-sm {
  padding: 0.5rem 0.65rem;
  font-size: 0.78rem;
  font-family: var(--font-mono);
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   BLOQUES EDITORIALES INFERIORES (NUMERADOS: 01, 02, 03)
   -------------------------------------------------------------------------- */
.info-section {
  margin-top: 3.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2.25rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.5rem 1.35rem;
  box-shadow: var(--shadow-paper);
}

.feature-num {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
  display: block;
}

.feature-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.feature-desc {
  font-size: 0.835rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   FOOTER EDITORIAL
   -------------------------------------------------------------------------- */
.app-footer {
  margin-top: auto;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   TOAST NOTIFICATIONS (MINIMALISTAS)
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  pointer-events: none;
}

.toast {
  background-color: var(--text-primary);
  color: var(--bg-surface);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-dropdown);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transform: translateY(12px);
  opacity: 0;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: auto;
}

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

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