:root {
    --background: #111827; /* bg-gray-900 */
    --foreground: #f9fafb; /* bg-gray-50 */
    --card: #1f2937; /* bg-gray-800 */
    --card-border: #374151; /* bg-gray-700 */
    --primary: #8b5cf6; /* violet-500 */
    --primary-hover: #7c3aed; /* violet-600 */
    --input-bg: #374151; /* bg-gray-700 */
    --input-border: #4b5563; /* border-gray-600 */
    --input-focus-border: var(--primary);
}

body {
    background-color: var(--background);
    color: var(--foreground);
    font-family: 'Inter', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Tampilan Login */
.login-card {
    background-color: var(--card);
    border-radius: 0.75rem;
    padding: 2.5rem;
    border: 1px solid var(--card-border);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.1);
}

/* Styling Form Input */
.form-input {
    width: 100%;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--foreground);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.3);
}

/* Styling Tombol */
.btn {
    font-weight: 600;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.2);
}
.btn-primary:active {
    transform: translateY(0);
}

/* Sidebar Styling */
.sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    transition: background-color 0.2s, color 0.2s;
    cursor: pointer;
    font-weight: 500;
    color: #d1d5db; /* gray-300 */
}
.sidebar-link:hover {
    background-color: var(--card);
    color: white;
}
.sidebar-link.active {
    background-color: var(--primary);
    color: white;
    font-weight: 600;
}
.sidebar-link i {
    width: 20px;
    height: 20px;
}

/* Main Content Styling */
#main-content {
    background-color: #0d111c; /* slightly darker than bg */
}

/* Spinner untuk Loading */
.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Transisi Fade In/Out */
.hidden {
    display: none;
    opacity: 0;
}