/* EduLectura 2026 v3.0 - Modern Design System */
/* Glassmorphism • Gradients • Dark Mode • Animations */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Inter:wght@300;400;500;600;700;800&display=swap');
@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css');

/* Core Variables */
:root {
  /* Light Mode */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(255, 255, 255, 0.25);
  
  /* Dark Mode */
  --bg-primary-dark: #0f0f23;
  --bg-secondary-dark: #1a1a2e;
  --text-primary-dark: #f8fafc;
  --text-secondary-dark: #94a3b8;
  --border-dark: #334155;
  --glass-bg-dark: rgba(26, 26, 46, 0.8);
  --glass-border-dark: rgba(248, 250, 252, 0.1);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
  --gradient-warning: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.1);
  --shadow-glass: 0 8px 32px rgba(31, 38, 135, 0.37);
  
  /* Animations */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.2s ease-out;
}

[data-theme="dark"] {
  --bg-primary: var(--bg-primary-dark);
  --bg-secondary: var(--bg-secondary-dark);
  --text-primary: var(--text-primary-dark);
  --text-secondary: var(--text-secondary-dark);
  --border: var(--border-dark);
  --glass-bg: var(--glass-bg-dark);
  --glass-border: var(--glass-border-dark);
}

/* Base */
* { box-sizing: border-box; margin: 0; padding: 0; }
body { 
  font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
  background: var(--bg-secondary); 
  color: var(--text-primary); 
  line-height: 1.6; 
  overflow-x: hidden;
  transition: var(--transition);
}

/* Layout */
.app-shell { min-height: 100vh; }
.container { max-width: 1400px; margin: 0 auto; padding: 0 1.5rem; }

/* Typography */
h1 { font-size: clamp(2rem, 5vw, 4rem); font-weight: 800; line-height: 1.1; margin-bottom: 1rem; }
h2 { font-size: clamp(1.5rem, 4vw, 2.75rem); font-weight: 700; }
h3 { font-size: 1.5rem; font-weight: 600; }

/* Glass Cards */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  box-shadow: var(--shadow-glass);
  transition: var(--transition);
}
.glass-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }

/* Modern Buttons */
.btn-modern {
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: 16px;
  padding: 1rem 2rem;
  font-weight: 700;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}
.btn-modern:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-modern i { font-size: 1.1rem; }

/* Forms */
.form-modern { 
  background: var(--glass-bg);
  border-radius: 20px;
  padding: 2rem;
  border: 1px solid var(--glass-border);
}
.form-input {
  background: rgba(255,255,255,0.5);
  border: 2px solid transparent;
  border-radius: 16px;
  padding: 1rem 1.5rem;
  font-weight: 500;
  transition: var(--transition);
  width: 100%;
}
.form-input:focus { 
  outline: none;
  border-color: var(--gradient-primary);
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
  background: white;
}

/* Navigation */
.nav-modern { 
  background: var(--glass-bg-dark);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 1.5rem;
  position: sticky;
  top: 2rem;
  height: fit-content;
}

/* Animations */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
.fade-up { animation: fadeInUp 0.6s ease-out forwards; }
@keyframes pulse-glow { 0%, 100% { box-shadow: 0 0 20px rgba(102, 126, 234, 0.3); } 50% { box-shadow: 0 0 40px rgba(102, 126, 234, 0.6); } }
.glow-pulse { animation: pulse-glow 2s infinite; }

/* Dark Mode Toggle */
.theme-toggle { 
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  cursor: pointer;
  transition: var(--transition);
}
.theme-toggle:hover { transform: scale(1.05); }

/* Responsive */
@media (max-width: 768px) { 
  .container { padding: 0 1rem; }
  .glass-card { padding: 1.5rem; }
}

/* Print */
@media print { 
  .no-print { display: none !important; }
  body { background: white !important; color: black !important; }
}