/* Color Palette */
:root {
    /* Primary Colors */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #a5b4fc;
    --secondary: #f59e0b;
    --secondary-dark: #d97706;
    
    /* UI Colors */
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-magical: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 50%, #6366f1 100%);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Typography */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Transitions */
    --transition-fast: 0.15s ease-out;
    --transition-base: 0.25s ease-out;
    --transition-slow: 0.4s ease-out;
}

/* Global Styles */
body {
    background: var(--gradient-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* LEARNature-ly Header */
.learnature-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding: var(--space-sm) var(--space-lg);
}

.logo-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition-base);
}

.logo-link:hover {
    transform: scale(1.05);
}

.learnature-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo-nature {
    color: var(--success);
}

.logo-ly {
    color: var(--secondary);
}

.logo-tagline {
    font-size: 0.75rem;
    color: var(--gray-600);
    margin-top: -0.25rem;
}

/* Adjust body padding to account for fixed header */
#app {
    padding-top: 70px;
}

/* Page Management */
.page {
    display: none;
    min-height: 100vh;
    position: relative;
}

.page.active {
    display: block;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    font-weight: var(--font-weight-semibold);
    font-size: 1rem;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    text-decoration: none;
    min-height: 48px;
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left var(--transition-slow);
}

.btn:hover:not(:disabled)::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--gradient-secondary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-success {
    background: var(--gradient-success);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-locked {
    background: var(--gray-400);
    color: var(--white);
    cursor: not-allowed;
}

.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    font-size: 1.25rem;
}

.btn-icon:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

/* Card Styles */
.card {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    animation: fadeIn var(--transition-base);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--space-2xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: slideInUp var(--transition-base);
}

.close {
    position: absolute;
    right: var(--space-lg);
    top: var(--space-lg);
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

.close:hover {
    color: var(--gray-600);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: var(--font-weight-medium);
    color: var(--gray-700);
}

.form-group input {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus {
    border-color: var(--primary);
    outline: none;
}

/* Progress Bars */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.xp-bar {
    position: relative;
    width: 200px;
    height: 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.xp-fill {
    height: 100%;
    background: var(--gradient-secondary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.xp-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    color: var(--white);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-magical);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

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

.loading-content {
    text-align: center;
    color: var(--white);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-left: 4px solid var(--white);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-lg);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInUp {
    from { 
        opacity: 0; 
        transform: translateY(50px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --space-md: 0.75rem;
        --space-lg: 1rem;
        --space-xl: 1.25rem;
        --space-2xl: 2rem;
    }
    
    .learnature-header {
        padding: var(--space-xs) var(--space-md);
    }
    
    .logo-text {
        font-size: 1.25rem;
    }
    
    .logo-tagline {
        font-size: 0.7rem;
    }
    
    #app {
        padding-top: 60px;
    }
    
    .btn {
        padding: var(--space-sm) var(--space-lg);
        font-size: 0.9rem;
    }
    
    .modal-content {
        padding: var(--space-lg);
        margin: var(--space-md);
    }
}

@media (max-width: 480px) {
    .learnature-header {
        padding: var(--space-xs) var(--space-sm);
    }
    
    .logo-text {
        font-size: 1.1rem;
    }
    
    .logo-tagline {
        font-size: 0.65rem;
    }
    
    #app {
        padding-top: 55px;
    }
    
    .btn {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.85rem;
        min-height: 44px;
    }
    
    .xp-bar {
        width: 150px;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none !important; }
.visible { display: block !important; }

.fade-in { animation: fadeIn var(--transition-base); }
.bounce { animation: bounce 2s infinite; }
.pulse { animation: pulse 2s infinite; }