:root {
    --primary-color: #0a192f; /* Deep Navy */
    --secondary-color: #112240; /* Lighter Navy for cards */
    --accent-color: #64ffda; /* Teal for minimal highlights (can be changed to corporate blue #007bff) */
    --text-primary: #ccd6f6; /* Off-white text */
    --text-secondary: #8892b0; /* Muted text */
    --bg-light: #f8f9fa; /* Light background for Business version sections */
    --corporate-blue: #0d6efd; /* Bootstrap primary blue */
}

body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: #333;
    line-height: 1.6;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.5px;
}

.text-navy {
    color: var(--primary-color);
}

.text-muted-custom {
    color: #6c757d;
}

/* Navbar */
.navbar-custom {
    background-color: var(--primary-color);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    color: white !important;
}

.nav-link {
    color: rgba(255,255,255,0.8) !important;
    font-weight: 500;
    margin-left: 1rem;
    transition: color 0.3s;
}

.nav-link:hover, .nav-link.active {
    color: #fff !important;
    text-decoration: underline;
    text-underline-offset: 5px;
}

.btn-switch-version {
    border: 1px solid rgba(255,255,255,0.3);
    color: white;
    padding: 0.375rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.btn-switch-version:hover {
    background-color: rgba(255,255,255,0.1);
    color: white;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.hero-subtitle {
    color: var(--accent-color); /* Or a soft blue */
    font-family: monospace;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2rem;
}

/* Cards (Universal) */
.project-card {
    border: none;
    background: #fff;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
    height: 100%;
    border-radius: 8px;
    overflow: hidden;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.card-header-img {
    height: 160px;
    background-color: #e9ecef;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #adb5bd;
    font-size: 3rem;
}

.card-body {
    padding: 1.5rem;
}

.tech-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.35em 0.65em;
    border-radius: 4px;
    background-color: #e3f2fd;
    color: #0d47a1;
    margin-right: 5px;
    margin-bottom: 5px;
    display: inline-block;
}

/* Business Version Specifics */
.business-card {
    border-left: 4px solid var(--primary-color);
}

.stat-box {
    background-color: #f8f9fa;
    border-radius: 6px;
    padding: 10px;
    text-align: center;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.stat-label {
    font-size: 0.8rem;
    color: #6c757d;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-list {
    list-style: none;
    padding-left: 0;
}

.metric-list li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.metric-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: green;
    font-weight: bold;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: rgba(255,255,255,0.7);
    padding: 3rem 0;
    font-size: 0.9rem;
}

footer a {
    color: white;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Utilities */
.section-title {
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: var(--primary-color);
    margin-top: 10px;
}

.bg-light-custom {
    background-color: #f8f9fa;
}