:root {
    --primary-color: #0d6efd;
    --bg-color: #f8f9fa;
    --text-color: #333;
    --card-bg: #ffffff;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

.navbar {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background-color: var(--card-bg);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.icon-large {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

/* Animasi Simulasi */
.state-box {
    display: inline-block;
    padding: 10px 20px;
    margin: 10px;
    border-radius: 8px;
    background-color: #e9ecef;
    font-weight: bold;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.state-box.active {
    background-color: var(--primary-color);
    color: white;
    transform: scale(1.1);
    box-shadow: 0 0 15px rgba(13, 110, 253, 0.5);
}

.state-box.accept {
    background-color: #198754;
    color: white;
    border-color: #198754;
}

.state-box.reject {
    background-color: #dc3545;
    color: white;
    border-color: #dc3545;
}

.arrow-down {
    text-align: center;
    font-size: 1.5rem;
    color: #6c757d;
    margin: 5px 0;
}

.simulation-container {
    max-height: 500px;
    overflow-y: auto;
    padding: 20px;
    background: #fff;
    border-radius: 10px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}

footer {
    background-color: #343a40;
    color: #fff;
    padding: 20px 0;
    margin-top: auto;
}