:root {
    --gray-dark: #333;
    --gray-medium: #666;
    --gray-light: #e0e0e0;
    --gray-bg: #f5f5f5;
    --white: #ffffff;
    --black: #000000;
    --border-color: #cccccc;
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--white);
    color: var(--gray-dark);
    line-height: 1.6;
}

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

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.py-40 { padding-top: 40px; padding-bottom: 40px; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--gray-medium);
    color: var(--white);
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: var(--gray-dark);
}

.btn-primary {
    background-color: var(--gray-dark);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--gray-dark);
    color: var(--gray-dark);
}

.btn-outline:hover {
    background-color: var(--gray-dark);
    color: var(--white);
}

/* Header & Nav */
header {
    background-color: var(--gray-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-placeholder {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--black);
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-dark);
    font-weight: 500;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--black);
    text-decoration: underline;
}

/* Hero Section */
.hero {
    background-color: var(--gray-light);
    padding: 60px 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--black);
}

.hero p {
    font-size: 1.2rem;
    color: var(--gray-medium);
    max-width: 800px;
    margin: 0 auto 30px;
}

.hero-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
}

/* Cards & Placeholders */
.card {
    border: 1px solid var(--border-color);
    padding: 20px;
    background-color: var(--white);
    border-radius: 4px;
}

.img-placeholder {
    background-color: var(--gray-light);
    width: 100%;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-medium);
    font-weight: bold;
    margin-bottom: 15px;
    border: 1px dashed var(--gray-medium);
}

/* Footer */
footer {
    background-color: var(--gray-dark);
    color: var(--white);
    padding: 40px 0;
    margin-top: 60px;
}

footer h3 {
    margin-bottom: 15px;
    border-bottom: 1px solid var(--gray-medium);
    padding-bottom: 10px;
}

footer p, footer li, footer a {
    color: #ccc;
    margin-bottom: 10px;
}

footer ul {
    list-style: none;
}

footer a { text-decoration: none; }
footer a:hover { color: var(--white); }

/* Responsive */
@media (max-width: 768px) {
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .navbar {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-links {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
}