:root {
    /* Color Palette - Deep Blue + Slate + Soft Accent */
    --primary-color: #1E3A8A;
    --primary-dark: #172554;
    --primary-light: #3B82F6;
    
    --secondary-color: #334155;
    --secondary-dark: #1F2937;
    
    --accent-color: #2563EB;
    --accent-dark: #1D4ED8;
    --error-color: #DC2626;     /* Red 600 */
    --success-color: #059669;
    --warning-color: #D97706;
    
    --text-primary: #0F172A;
    --text-secondary: #334155;
    --text-muted: #64748B;
    
    --bg-body: #F8FAFC;
    --bg-card: #FFFFFF;
    --bg-input: #FFFFFF;
    --bg-accent: #E2E8F0;
    --bg-accent-soft: rgba(37, 99, 235, 0.12);
    
    --border-color: #CBD5E1;    /* Slate 300 */
    
    --shadow-sm: 0 1px 2px 0 rgba(30, 58, 138, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(30, 58, 138, 0.12), 0 2px 4px -1px rgba(30, 58, 138, 0.08);
    --shadow-lg: 0 10px 15px -3px rgba(30, 58, 138, 0.12), 0 4px 6px -2px rgba(30, 58, 138, 0.08);
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);

    /* Typography */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.5;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--bg-body);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-dark);
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
}

/* Layout Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Button Components - Large */
.btn-primary-lg, .btn-secondary-lg, .btn-accent-lg, .btn-white, .btn-outline-white, .cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    text-decoration: none;
    gap: 0.5rem;
}

/* Button Components - Standard */
.btn-primary, .btn-secondary, .btn-accent {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    text-decoration: none;
    gap: 0.5rem;
    font-size: 0.95rem;
}

/* Primary Button Styles */
.btn-primary, .btn-primary-lg {
    background-color: var(--primary-color);
    color: white;
}
.btn-primary:hover, .btn-primary-lg:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    color: white;
    box-shadow: var(--shadow-md);
}

/* Accent Button Styles */
.btn-accent, .btn-accent-lg {
    background-color: var(--accent-color);
    color: white;
}
.btn-accent:hover, .btn-accent-lg:hover {
    background-color: var(--accent-dark);
    transform: translateY(-1px);
    color: white;
    box-shadow: var(--shadow-md);
}

/* Secondary Button Styles */
.btn-secondary, .btn-secondary-lg {
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover, .btn-secondary-lg:hover {
    background-color: var(--bg-accent);
    color: var(--primary-dark);
    border-color: var(--primary-color);
}

/* White Button Styles */
.btn-white {
    background-color: white;
    color: var(--primary-color);
}
.btn-white:hover {
    background-color: var(--bg-input);
}

.btn-outline-white {
    background-color: transparent;
    border: 2px solid white;
    color: white;
}
.btn-outline-white:hover {
    background-color: rgba(255,255,255,0.1);
    color: white;
}

.nav-cta-btn {
    background-color: var(--accent-color);
    color: white !important;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
}
.nav-cta-btn:hover {
    background-color: var(--accent-dark);
}

/* Utilities */
.text-center { text-align: center; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

/* =========================================
   Global Header & Navigation
   ========================================= */
.site-header {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a:not(.nav-cta-btn) {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-links a:not(.nav-cta-btn):hover,
.nav-links a.active {
    color: var(--primary-color);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    font-size: 1.5rem;
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1.5rem;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        align-items: stretch;
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }
}

/* =========================================
   Global Footer
   ========================================= */
.site-footer {
    background: var(--secondary-dark);
    color: #F3F4F6;
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: #9CA3AF;
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: white;
}

@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}