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

:root {
    /* Professional color scheme - muted and business-appropriate */
    --primary-color: #1a365d;        /* Deep navy blue - trust and professionalism */
    --secondary-color: #2563eb;      /* Professional blue - accent */
    --accent-color: #0891b2;         /* Cyan blue - subtle highlights */
    --text-color: #1f2937;           /* Dark gray - readable text */
    --text-light: #6b7280;           /* Medium gray - secondary text */
    --light-bg: #f9fafb;             /* Very light gray - backgrounds */
    --white: #ffffff;
    --border-color: #e5e7eb;         /* Light gray - borders */
    --success-color: #059669;        /* Professional green */
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-hover: 0 4px 12px rgba(0,0,0,0.12);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===================================
   Header
   =================================== */
.site-header {
    background: var(--primary-color);
    color: var(--white);
    padding: 2rem 0;
    box-shadow: var(--shadow);
}

.header-content {
    text-align: center;
}

.logo h1 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* ===================================
   Navigation
   =================================== */
.main-navigation {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-menu {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    padding: 0;
}

.nav-menu li {
    margin: 0;
}

.nav-menu a {
    display: block;
    padding: 1rem 1.5rem;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.nav-menu a:hover {
    color: var(--secondary-color);
    background-color: var(--light-bg);
}

.nav-menu a.active {
    color: var(--secondary-color);
    border-bottom-color: var(--secondary-color);
}

/* ===================================
   Main Content
   =================================== */
main {
    min-height: calc(100vh - 400px);
    padding: 3rem 0;
}

.hero {
    background: var(--primary-color);
    color: var(--white);
    padding: 4rem 2rem;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 3rem;
    box-shadow: var(--shadow);
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

.content-section {
    margin-bottom: 3rem;
}

.content-section h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--secondary-color);
}

.content-section h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.content-section ul {
    margin-bottom: 1.5rem;
    margin-left: 2rem;
}

.content-section li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* ===================================
   Cards & Grid
   =================================== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}

.card h3 {
    color: var(--secondary-color);
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.card p {
    margin-bottom: 0.8rem;
}

.card ul {
    margin-left: 1.5rem;
}

.card .icon {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--light-bg);
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

/* ===================================
   Feature Boxes
   =================================== */
.feature-box {
    background: var(--light-bg);
    border-left: 4px solid var(--secondary-color);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 4px;
}

.feature-box h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.highlight-box {
    background: var(--light-bg);
    border: 2px solid var(--secondary-color);
    color: var(--text-color);
    padding: 2rem;
    border-radius: 8px;
    margin: 2rem 0;
    box-shadow: var(--shadow);
}

.highlight-box h3 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 1rem;
}

/* ===================================
   Buttons & Links
   =================================== */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background-color: var(--secondary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
}

.btn:hover {
    background-color: #2980b9;
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--success-color);
}

.btn-secondary:hover {
    background-color: #229954;
}

/* ===================================
   Footer
   =================================== */
.site-footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

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

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a,
.footer-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover,
.footer-link:hover {
    color: var(--white);
    text-decoration: underline;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .tagline {
        font-size: 0.9rem;
    }
    
    .nav-menu {
        flex-direction: column;
    }
    
    .nav-menu a {
        text-align: center;
        border-bottom: 1px solid var(--border-color);
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
}