/* ============================================
   GESTOS MÓVILES - Estilos principales
   App educativa para aprender gestos táctiles
   ============================================ */

/* --- VARIABLES --- */
:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #818CF8;
  --success: #10B981;
  --success-bg: #D1FAE5;
  --error: #EF4444;
  --error-bg: #FEE2E2;
  --warning: #F59E0B;
  --bg: #F8FAFC;
  --surface: #FFFFFF;
  --text: #0F172A;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --border: #E2E8F0;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --radius: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

/* --- PANTALLAS --- */
.screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--bg);
}

.screen.active {
  opacity: 1;
  visibility: visible;
  z-index: 1;
}

/* ============================================
   PANTALLA DE INICIO
   ============================================ */
#screen-home {
  justify-content: center;
  align-items: center;
  padding: 24px;
  background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
}

.home-content {
  text-align: center;
  width: 100%;
  max-width: 340px;
}

.home-logo {
  font-size: 96px;
  line-height: 1;
  margin-bottom: 12px;
  animation: float 3s ease-in-out infinite;
  filter: drop-shadow(0 8px 16px rgba(0,0,0,0.2));
}

.home-content h1 {
  color: #fff;
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

.home-subtitle {
  color: rgba(255,255,255,0.85);
  font-size: 16px;
  line-height: 1.5;
  margin-bottom: 40px;
}

/* --- Botones principales --- */
.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 18px 24px;
  margin-bottom: 14px;
  font-size: 18px;
  font-weight: 600;
  color: var(--primary);
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition), box-shadow var(--transition);
  min-height: 56px;
}

.btn-primary:active {
  transform: scale(0.97);
  box-shadow: var(--shadow);
}

.btn-icon {
  font-size: 24px;
}

/* ============================================
   ENCABEZADO COMÚN
   ============================================ */
.screen-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 5;
}

.screen-header h2 {
  font-size: 18px;
  font-weight: 700;
}

.btn-back {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  background: var(--bg);
  border-radius: var(--radius);
  transition: background var(--transition);
  flex-shrink: 0;
}

.btn-back:active {
  background: var(--border);
}

/* ============================================
   PANTALLA APRENDER - Tarjetas
   ============================================ */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 16px 20px;
  padding-bottom: 32px;
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px 14px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.card:active {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-icon {
  font-size: 36px;
  line-height: 1;
  margin-bottom: 4px;
}

.card h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

.card p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.card-tip {
  margin-top: 4px;
  padding: 6px 10px;
  background: #EEF2FF;
  border-radius: 8px;
  font-size: 11px;
  color: var(--primary);
  font-weight: 500;
  line-height: 1.3;
  width: 100%;
}

/* --- Feedback en tarjetas interactivas --- */
.card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  touch-action: none;
}

.card-detecting {
  outline: 3px solid var(--primary-light);
  outline-offset: -3px;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-feedback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  border-radius: var(--radius);
  z-index: 5;
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.card-feedback.show {
  opacity: 1;
}

.card-feedback.success {
  background: rgba(209, 250, 229, 0.95);
}

.card-feedback.error {
  background: rgba(254, 226, 226, 0.95);
}

.card-feedback-icon {
  font-size: 32px;
  line-height: 1;
}

.card-feedback-text {
  font-size: 13px;
  font-weight: 700;
}

.card-feedback.success .card-feedback-text {
  color: #065F46;
}

.card-feedback.error .card-feedback-text {
  color: #991B1B;
}

/* ============================================
   PANTALLA PRÁCTICA
   ============================================ */
#screen-practice {
  background: var(--bg);
}

/* --- Barra de progreso --- */
.progress-section {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.progress-bar {
  flex: 1;
  height: 10px;
  background: var(--border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--success));
  border-radius: var(--radius-full);
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0%;
}

.progress-text {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
  min-width: 50px;
  text-align: right;
}

.btn-reset {
  align-self: flex-end;
  margin: 8px 20px 0;
  padding: 8px 16px;
  font-size: 13px;
  color: var(--text-muted);
  background: transparent;
  border-radius: var(--radius-full);
  transition: color var(--transition), background var(--transition);
}

.btn-reset:active {
  color: var(--error);
  background: var(--error-bg);
}

/* --- Área de práctica --- */
.practice-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 12px 20px 20px;
  overflow-y: auto;
}

.instruction-area {
  text-align: center;
  margin-bottom: 12px;
}

.instruction-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 4px;
}

.instruction-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
  transition: opacity var(--transition);
}

/* --- El área táctil --- */
.practice-area {
  position: relative;
  flex: 1;
  min-height: 260px;
  background: var(--surface);
  border: 3px dashed var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), background var(--transition);
  touch-action: none;
  cursor: pointer;
  overflow: hidden;
}

.practice-area.highlight {
  border-color: var(--primary-light);
  background: #EEF2FF;
}

/* --- Sugerencia visual animada --- */
.hint-container {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 1;
}

.hint-element {
  font-size: 64px;
  opacity: 0.3;
  transition: opacity var(--transition);
}

.hint-element.tap {
  animation: hintTap 1.5s ease-in-out infinite;
}

.hint-element.double-tap {
  animation: hintDoubleTap 1.5s ease-in-out infinite;
}

.hint-element.long-press {
  animation: hintPulse 1.5s ease-in-out infinite;
}

.hint-element.swipe-left {
  animation: hintSwipeLeft 1.5s ease-in-out infinite;
}

.hint-element.swipe-right {
  animation: hintSwipeRight 1.5s ease-in-out infinite;
}

.hint-element.swipe-up {
  animation: hintSwipeUp 1.5s ease-in-out infinite;
}

.hint-element.swipe-down {
  animation: hintSwipeDown 1.5s ease-in-out infinite;
}

.hint-element.drag {
  animation: hintDrag 2s ease-in-out infinite;
}

.hint-element.pinch {
  animation: hintPinch 1.5s ease-in-out infinite;
}

.hint-element.spread {
  animation: hintSpread 1.5s ease-in-out infinite;
}

.hint-element.pull-to-refresh {
  animation: hintPull 1.5s ease-in-out infinite;
}

/* --- Feedback --- */
.feedback {
  text-align: center;
  padding: 12px;
  margin-top: 12px;
  border-radius: var(--radius);
  transition: opacity var(--transition), transform var(--transition);
  flex-shrink: 0;
}

.feedback.hidden {
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
}

.feedback.success {
  background: var(--success-bg);
  color: #065F46;
}

.feedback.error {
  background: var(--error-bg);
  color: #991B1B;
}

.feedback-icon {
  font-size: 36px;
  display: block;
  margin-bottom: 4px;
}

.feedback-text {
  font-size: 15px;
  font-weight: 600;
}

.feedback-detail {
  font-size: 13px;
  margin-top: 2px;
  opacity: 0.8;
}

/* --- Botón Siguiente --- */
.btn-next {
  display: block;
  width: calc(100% - 40px);
  margin: 12px auto 0;
  padding: 16px;
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  border-radius: var(--radius);
  transition: opacity var(--transition), transform var(--transition);
  flex-shrink: 0;
}

.btn-next:active {
  transform: scale(0.97);
  background: var(--primary-dark);
}

.btn-next.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
}

/* --- Completado --- */
.completed-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.95);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  z-index: 10;
  padding: 40px 20px;
  text-align: center;
  border-radius: var(--radius-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.completed-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.completed-icon {
  font-size: 72px;
  animation: celebrate 1s ease-in-out;
}

.completed-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
}

.completed-sub {
  font-size: 16px;
  color: var(--text-secondary);
}

/* ============================================
   MODAL DE LIMITACIÓN
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 32px 24px 24px;
  max-width: 340px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-lg);
  transform: scale(0.9);
  transition: transform var(--transition);
}

.modal-overlay.show .modal-content {
  transform: scale(1);
}

.modal-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.modal-text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.btn-modal {
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  border-radius: var(--radius);
  transition: background var(--transition);
}

.btn-modal:active {
  background: var(--primary-dark);
}

/* ============================================
   ANIMACIONES
   ============================================ */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes hintTap {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(20px) scale(0.9); }
}

@keyframes hintDoubleTap {
  0%, 100% { transform: translateY(0) scale(1); }
  25% { transform: translateY(20px) scale(0.9); }
  50% { transform: translateY(0) scale(1); }
  75% { transform: translateY(20px) scale(0.9); }
}

@keyframes hintPulse {
  0%, 100% { transform: scale(1); opacity: 0.3; }
  50% { transform: scale(1.15); opacity: 0.5; }
}

@keyframes hintSwipeLeft {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(-40px); }
}

@keyframes hintSwipeRight {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(40px); }
}

@keyframes hintSwipeUp {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-40px); }
}

@keyframes hintSwipeDown {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(40px); }
}

@keyframes hintDrag {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-20px); }
  75% { transform: translateX(20px); }
}

@keyframes hintPinch {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(0.6); }
}

@keyframes hintSpread {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.4); }
}

@keyframes hintPull {
  0%, 100% { transform: translateY(0); }
  40% { transform: translateY(30px); }
  60% { transform: translateY(25px); }
}

@keyframes celebrate {
  0% { transform: scale(0) rotate(-20deg); opacity: 0; }
  60% { transform: scale(1.2) rotate(5deg); }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}

@keyframes popIn {
  0% { transform: scale(0.5); opacity: 0; }
  70% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

/* ============================================
   RESPONSIVE - Tablets
   ============================================ */
@media (min-width: 600px) {
  .cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .card {
    padding: 24px 18px;
  }

  .card-icon {
    font-size: 44px;
  }

  .card h3 {
    font-size: 16px;
  }

  .card p {
    font-size: 13px;
  }

  .instruction-text {
    font-size: 24px;
  }

  .practice-area {
    min-height: 320px;
  }
}

/* ============================================
   RESPONSIVE - Escritorio
   ============================================ */
@media (min-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(4, 1fr);
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 20px 40px;
  }

  .screen-header {
    padding: 20px 32px;
  }

  .screen-header h2 {
    font-size: 20px;
  }

  .practice-wrapper {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
    padding: 20px 20px 24px;
  }

  .practice-area {
    min-height: 350px;
  }

  .card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }
}

/* ============================================
   UTILIDADES
   ============================================ */
.hidden {
  display: none !important;
}