:root {
    --primary: #0056b3;
    --secondary: #f8f9fa;
    --accent: #e67e22;
    --dark: #2c3e50;
    --text: #333;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    line-height: 1.6;
    color: var(--text);
    background-color: #fff;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary), #003366);
    color: white;
    padding: 10px 0;
    text-align: center;
}

.hero h1 { font-size: 2.5rem; margin-bottom: 10px; }
.subtitle { font-size: 1.2rem; opacity: 0.9; }

/* Disclaimer */
.disclaimer {
    background: #fff3cd;
    color: #856404;
    text-align: center;
    padding: 15px 0;
    border-bottom: 1px solid #ffeeba;
}

/* About Section */
.about { padding: 10px 0; background: var(--secondary); }
.grid { display: flex; gap: 30px; }
.card-text { flex: 1; }

/* Projects Grid */
.projects { padding: 20px 0; text-align: center; }
.grid-projects {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.project-card {
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 20px;
    transition: transform 0.3s ease;
    background: white;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.project-card:hover { transform: translateY(-5px); }

.img-placeholder1 {
    height: 150px;
    background: #eee;
    background-image: url("img1.png");
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border-radius: 5px;
    margin-bottom: 15px;
    color: #ccc;
}
.img-placeholder2 {
    height: 150px;
    background: #eee;
    background-image: url("img2.png");
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border-radius: 5px;
    margin-bottom: 15px;
    color: #ccc;
}
.img-placeholder3 {
    height: 150px;
    background: #eee;
    background-image: url("img3.png");
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border-radius: 5px;
    margin-bottom: 15px;
    color: #ccc;
}

.authors { font-style: italic; color: #666; margin-bottom: 5px; }
.tech { font-weight: bold; color: var(--primary); margin-bottom: 20px; }

.btn {
    display: inline-block;
    background: var(--accent);
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
}

.btn:hover { background: #d35400; }

/* Footer */
footer {
    background: var(--dark);
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
}