/* 
 * Modern Typography System for MyLesson.AI
 * Clean, professional fonts with proper fallbacks
 */

/* Import modern fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* Base typography */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: 'kern' 1;
    text-rendering: optimizeLegibility;
}

/* Headings */
h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, .h1 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

h2, .h2 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h3, .h3 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h4, .h4 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

h5, .h5 {
    font-size: 1.125rem;
    font-weight: 600;
}

h6, .h6 {
    font-size: 1rem;
    font-weight: 600;
}

/* Body text */
p, .text-body {
    font-size: 1rem;
    line-height: 1.6;
    font-weight: 400;
}

/* Small text */
small, .small {
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Labels and form text */
label, .form-label {
    font-weight: 500;
    font-size: 0.875rem;
    letter-spacing: 0.01em;
}

/* Buttons */
.btn {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    font-weight: 500;
    letter-spacing: 0.01em;
}

/* Code and monospace */
code, pre, .code {
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Source Code Pro', monospace;
    font-size: 0.875em;
}

/* Input fields */
input, textarea, select {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    font-size: 0.9375rem;
}

/* Navigation */
.nav-link, .navbar-brand {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    font-weight: 500;
}

/* Sidebar */
.sidebar {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
}

/* Cards */
.card-title {
    font-weight: 600;
    letter-spacing: -0.01em;
}

/* Responsive typography */
@media (max-width: 768px) {
    h1, .h1 {
        font-size: 1.75rem;
    }
    
    h2, .h2 {
        font-size: 1.5rem;
    }
    
    h3, .h3 {
        font-size: 1.25rem;
    }
}