/* ================================
   Base Styles & CSS Variables
   ================================ */

/* CSS Variables */
:root {
    /* Colors */
    --primary-color: #3b82f6;
    --secondary-color: #1e40af;
    --accent-color: #2563eb;
    
    /* Light Mode */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --border-color: #e2e8f0;
    
    /* Navbar & Footer */
    --navbar-bg: #ffffff;
    --footer-bg: #2c3e50;
    --footer-text: #ecf0f1;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Typography */
    --font-primary: 'Roboto', sans-serif;
    --font-heading: 'Montserrat', sans-serif;
    
    /* Transitions */
    --transition-speed: 0.3s;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --navbar-bg: #1e293b;
    --footer-bg: #0f172a;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overscroll-behavior-y: none;
    overflow-x: hidden;
    width: 100%;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-speed) ease, 
                color var(--transition-speed) ease;
    overscroll-behavior-y: none;
    overflow-x: hidden;
    width: 100%;
    position: relative;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-speed) ease;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    overflow-x: hidden;
}

/* Section Padding */
.section-padding {
    padding: var(--spacing-xl) 0;
}

/* Prevent horizontal overflow on all main content sections */
main, section {
    overflow-x: hidden;
    width: 100%;
    max-width: 100%;
}

/* Section Title */
.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    margin: 1rem auto 0;
}

/* Background Utilities */
.bg-light {
    background-color: var(--bg-secondary);
}

/* Button Styles */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all var(--transition-speed) ease;
    font-family: var(--font-heading);
}

.btn-primary {
    background: var(--primary-color);
    color: #ffffff;
}

.btn-primary:hover {
    background: #1e40af;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: #ffffff;
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.1rem;
}

.btn-text {
    background: transparent;
    color: var(--primary-color);
    padding: 0.5rem 0;
    font-weight: 600;
}

.btn-text:hover {
    color: #1e40af;
}

.btn-text i {
    margin-left: 0.5rem;
    transition: transform var(--transition-speed) ease;
}

.btn-text:hover i {
    transform: translateX(5px);
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
        --spacing-md: 1.5rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
}