:root {
    --primary: #2c3e50;
    --accent: #27ae60;
    --bg: #f4f6f7;
    --card-bg: #ffffff;
    --danger: #e74c3c;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: #333;
}

header {
    background: var(--primary);
    color: white;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 { margin: 0; font-size: 1.5rem; }

.project-controls { display: flex; gap: 1rem; }
.project-controls select { padding: 0.5rem; border-radius: 4px; border: none; font-size: 1rem; }
.project-controls button { margin: 0; background: var(--accent); color: white; border: none; padding: 0.5rem 1rem; border-radius: 4px; cursor: pointer; }

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

h2 {
    border-bottom: 2px solid var(--accent);
    padding-bottom: 0.5rem;
    margin-top: 2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: center;
}

.stat-card h3 { margin: 0; color: #7f8c8d; font-size: 0.9rem; text-transform: uppercase; }
.stat-card p { font-size: 2.5rem; font-weight: bold; margin: 0.5rem 0 0; color: var(--primary); }

.grid-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.obs-card {
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.obs-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-content {
    padding: 1rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: bold;
    color: white;
}

.badge.conflict {
    background: var(--danger);
}

#sparql-playground textarea {
    width: 100%;
    height: 150px;
    font-family: monospace;
    padding: 1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 0.5rem;
}

button:hover {
    background: #219150;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    background: white;
}

th, td {
    padding: 0.75rem;
    border: 1px solid #ddd;
    text-align: left;
}

th {
    background: #eee;
}

/* Modal */
.modal {
    display: none; 
    position: fixed; 
    z-index: 10; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(0,0,0,0.4); 
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto; 
    padding: 20px;
    border: 1px solid #888;
    width: 80%; 
    max-width: 500px;
    border-radius: 8px;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
}

.modal input {
    width: 100%;
    padding: 0.5rem;
    margin: 1rem 0;
    font-size: 1rem;
}