:root {
    --primary: #1e3a8a;
    --secondary: #0284c7;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --danger: #dc2626;
    --success: #16a34a;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { background-color: var(--bg); color: var(--text); padding-bottom: 40px; }

header {
    background-color: var(--primary);
    color: white;
    padding: 1.5rem;
    text-align: center;
}

header h1 { font-size: 1.5rem; }

nav {
    background: #0f172a;
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 10px;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.9rem;
}

nav a:hover { background: rgba(255,255,255,0.2); }

.container { max-width: 900px; margin: 2rem auto; padding: 0 1rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }

.card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    border: 1px solid #e2e8f0;
    margin-bottom: 1.5rem;
}

.card h2 { font-size: 1.25rem; color: var(--primary); margin-bottom: 1rem; }

.btn {
    display: block;
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    background-color: var(--secondary);
    color: white;
    font-weight: bold;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    margin-top: 0.5rem;
}

.btn:hover { opacity: 0.9; }
.btn-danger { background-color: var(--danger); }
.btn-success { background-color: var(--success); }
.btn-dark { background-color: #334155; }

.mural-item {
    background: #f1f5f9;
    padding: 0.8rem;
    border-radius: 6px;
    margin-bottom: 0.8rem;
    border-left: 4px solid var(--secondary);
}

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.3rem; font-weight: 600; }
.form-group input, .form-group textarea {
    width: 100%; padding: 0.6rem; border: 1px solid #ccc; border-radius: 6px;
}

table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
th, td { border: 1px solid #ddd; padding: 8px; text-align: left; }
th { background-color: #f2f2f2; }