:root {
    --primary-color: #5bc0de; /* biru muda */
    --primary-color-dark: #31b0d5;
    --background-color: #e9f7fc;
    --text-color: #0a3d62;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    transition: background-color 0.3s ease;
}

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

h1, h2, h3 {
    font-weight: 700;
}

.card {
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(91, 192, 222, 0.3);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 8px var(--primary-color);
}

.table thead {
    background-color: var(--primary-color);
    color: white;
}

.navbar {
    background-color: var(--primary-color);
}

.navbar-brand, .nav-link, .navbar-text {
    color: white !important;
}

a {
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}