/* ==========================================================================
   GUÍA MAESTRA: DESARROLLO GUIADO POR IA - ESTILOS PRINCIPALES
   Diseño: Modern Dark / Tech Glassmorphism (Gemini / Stitch Inspired)
   ========================================================================== */

:root {
  --bg-main: #090d16;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(30, 41, 59, 0.95);
  --bg-sidebar: #0f172a;
  --bg-input: #1e293b;
  
  --border-color: rgba(51, 65, 85, 0.6);
  --border-focus: #6366f1;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-gemini: #818cf8;
  --accent-gemini-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --accent-stitch: #10b981;
  --accent-aistudio: #38bdf8;
  --accent-supabase: #3ecf8e;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.25);
  
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, monospace;
}

[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  --bg-sidebar: #ffffff;
  --bg-input: #f1f5f9;
  
  --border-color: #e2e8f0;
  --border-focus: #4f46e5;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.15);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* ==========================================================================
   HEADER & NAVBAR
   ========================================================================== */

.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 36px;
  height: 36px;
  background: var(--accent-gemini-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: 0 0 15px rgba(168, 85, 247, 0.4);
}

.brand-title {
  font-size: 1.1rem;
  font-weight: 700;
  background: linear-gradient(to right, #ffffff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-badge {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  background: rgba(99, 102, 241, 0.2);
  color: #818cf8;
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-full);
  font-weight: 600;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.gamification-chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
}

.xp-badge {
  color: #fbbf24;
  font-weight: 700;
}

.btn-icon {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all 0.2s ease;
}

.btn-icon:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

/* Reading Progress */
.progress-bar-container {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.05);
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-gemini-gradient);
  transition: width 0.3s ease;
}

/* ==========================================================================
   APP LAYOUT (SIDEBAR + MAIN)
   ========================================================================== */

.app-layout {
  display: flex;
  flex: 1;
  min-height: calc(100vh - 65px);
}

.sidebar {
  width: 300px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  padding: 1.25rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.sidebar-section-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 700;
  padding: 0 0.75rem;
  margin-bottom: 0.5rem;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.nav-item-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-item-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.nav-item-btn.active {
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
  border-color: rgba(99, 102, 241, 0.3);
  font-weight: 600;
}

.nav-item-icon {
  font-size: 1.15rem;
  width: 24px;
  text-align: center;
}

.main-content {
  flex: 1;
  padding: 2rem 2.5rem;
  max-width: 1300px;
  margin: 0 auto;
  width: 100%;
}

/* ==========================================================================
   MODULE CARDS & CONTENT
   ========================================================================== */

.module-header {
  margin-bottom: 2rem;
}

.module-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.module-title {
  font-size: 1.9rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.module-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 900px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.75rem;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all 0.2s ease;
}

.card:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 0.75rem;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* ==========================================================================
   PIPELINE STEP CARDS
   ========================================================================== */

.pipeline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.pipeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
  cursor: pointer;
}

.pipeline-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--accent-gemini-gradient);
  opacity: 0.8;
}

.pipeline-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--border-focus);
}

.step-number {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  color: #818cf8;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.step-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ==========================================================================
   CODE BLOCKS & COPY BUTTONS
   ========================================================================== */

.code-container {
  position: relative;
  background: #0b0f19;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin: 1rem 0;
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: #111827;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.code-content {
  padding: 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: #e2e8f0;
  line-height: 1.6;
  white-space: pre;
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #f8fafc;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-copy:hover {
  background: rgba(99, 102, 241, 0.3);
  border-color: #818cf8;
}

/* ==========================================================================
   FORMS, INPUTS & GENERATORS
   ========================================================================== */

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-control {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.9rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  transition: all 0.2s ease;
}

.form-control:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

textarea.form-control {
  min-height: 100px;
  resize: vertical;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--accent-gemini-gradient);
  color: #ffffff;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
  transition: all 0.2s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-muted);
}

/* ==========================================================================
   QUIZ & INTERACTIVE EXERCISES
   ========================================================================== */

.quiz-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.quiz-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.quiz-question {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.quiz-option:hover {
  border-color: var(--border-focus);
  background: rgba(99, 102, 241, 0.1);
}

.quiz-option.correct {
  background: rgba(16, 185, 129, 0.2);
  border-color: #10b981;
  color: #34d399;
}

.quiz-option.incorrect {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
  color: #f87171;
}

.quiz-feedback {
  margin-top: 0.75rem;
  padding: 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  line-height: 1.5;
  display: none;
}

.quiz-feedback.show {
  display: block;
}

/* ==========================================================================
   TOAST NOTIFICATIONS
   ========================================================================== */

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background: #1e293b;
  color: #f8fafc;
  border: 1px solid #334155;
  border-left: 4px solid var(--accent-gemini);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: slideIn 0.3s ease;
}

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

/* ==========================================================================
   UI/UX ENHANCEMENTS & PREMIUM FINISHES
   ========================================================================== */

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: rgba(15, 23, 42, 0.6);
}

::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.3);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(99, 102, 241, 0.6);
}

/* Card Glow Effect */
.card-highlight {
  border-color: rgba(129, 140, 248, 0.5) !important;
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.25) !important;
}

/* Enhanced Buttons */
.btn-primary:active, .btn-secondary:active, .btn-icon:active {
  transform: scale(0.98);
}

.nav-item-btn {
  position: relative;
  overflow: hidden;
}

.nav-item-btn.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--accent-gemini-gradient);
  border-radius: 0 4px 4px 0;
}

/* Badge Enhancements */
.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-gemini {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-supabase {
  background: rgba(62, 207, 142, 0.15);
  color: #6ee7b7;
  border: 1px solid rgba(62, 207, 142, 0.3);
}

.badge-stitch {
  background: rgba(56, 189, 248, 0.15);
  color: #7dd3fc;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

/* Code Container Header Accent */
.code-container {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.code-header {
  border-bottom: 1px solid rgba(99, 102, 241, 0.2);
}

/* ==========================================================================
   CATÁLOGO DE 40 ESTILOS FRONTEND PARA GOOGLE STITCH
   ========================================================================== */

.style-category-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.category-pill {
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  background: rgba(30, 41, 59, 0.7);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s ease;
}

.category-pill:hover {
  background: rgba(51, 65, 85, 0.8);
  color: var(--text-primary);
  border-color: rgba(99, 102, 241, 0.4);
}

.category-pill.active {
  background: rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
  border-color: #818cf8;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.25);
}

.styles-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.25rem;
}

.style-card {
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.style-card:hover {
  transform: translateY(-3px);
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 0 15px rgba(99, 102, 241, 0.15);
}

.style-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.style-icon {
  font-size: 1.75rem;
  line-height: 1;
}

.style-number {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-stitch);
  letter-spacing: 0.05em;
  display: block;
}

.style-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 0.1rem;
  line-height: 1.25;
}

.style-category-tag {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  padding: 0.2rem 0.55rem;
  font-size: 0.7rem;
  font-weight: 600;
  white-space: nowrap;
}

.style-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0.75rem 0;
}

.style-details {
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  font-size: 0.8rem;
  color: #cbd5e1;
  border: 1px solid rgba(255, 255, 255, 0.05);
  margin-bottom: 1rem;
}

.style-detail-row {
  line-height: 1.45;
}

.style-detail-row strong {
  color: #a5b4fc;
  font-weight: 600;
}

.style-card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-top: auto;
}

.btn-style-copy {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.btn-style-copy:hover {
  background: rgba(99, 102, 241, 0.3);
  color: #ffffff;
  border-color: #818cf8;
}

.btn-style-apply {
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}

.btn-style-apply:hover {
  background: rgba(16, 185, 129, 0.3);
  color: #ffffff;
  border-color: #34d399;
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 900px) {
  .app-layout {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .main-content {
    padding: 1.25rem;
  }
  .styles-cards-grid {
    grid-template-columns: 1fr;
  }
}