:root {
    --brand-primary: #FF002B;
    --brand-secondary: #BBD4EC;
    --brand-accent: #FFEA52;
    --text-dark: #060E16;
    --text-light: #FFFFFF;
    --bg-light-gradient: linear-gradient(135deg, #FFFFFF, #BBD4EC);
    --bg-red-gradient: linear-gradient(52deg, #FF002B, #FFC3C0);

    --font-family-system: system-ui, -apple-system, 'Segoe UI', sans-serif;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-pill: 999px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body {
    font-family: var(--font-family-system);
    margin: 0;
    padding: 0;
    background: var(--bg-light-gradient);
    color: var(--text-dark);
    line-height: 1.6;
}

#app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Navbar */
.navbar {
    background-color: var(--brand-primary);
    color: var(--text-light);
    padding: var(--spacing-sm) var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-light);
    font-weight: 700;
    font-size: 1.5rem;
}

.logo {
    height: 32px;
    margin-right: var(--spacing-sm);
}

.brand-name {
    background: var(--bg-red-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    font-size: 1.5rem; /* Adjusted for better visibility */
}


.navbar nav a {
    color: var(--text-light);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    transition: background-color 0.3s ease, color 0.3s ease;
    font-weight: 500;
}

.navbar nav a:hover,
.navbar nav a.active {
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--brand-accent);
}

/* Main Content */
main {
    flex-grow: 1;
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}

.content-section {
    display: none;
    animation: fadeIn 0.5s ease-out;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

h1 {
    font-size: 2.5rem;
    color: var(--brand-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    background: var(--bg-red-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
}

h2 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

/* Cards */
.card {
    background-color: var(--text-light);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--brand-secondary);
}

/* Dashboard */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    text-align: center;
}

.stat-card h2 {
    font-size: 1.2rem;
    color: var(--brand-primary);
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
}

.chart-card {
    position: relative;
}

/* Forms */
.data-form {
    background-color: var(--text-light);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--brand-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl) auto;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-dark);
}

.input-field,
.select-field,
textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--brand-secondary);
    border-radius: var(--border-radius-sm);
    font-family: var(--font-family-system);
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.input-field:focus,
.select-field:focus,
textarea:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(255, 0, 43, 0.2);
    outline: none;
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-pill);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background-color: var(--brand-primary);
    color: var(--text-light);
}

.btn-primary:hover {
    background-color: darken(var(--brand-primary), 10%); /* Placeholder for darker shade */
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--brand-secondary);
    color: var(--text-dark);
    border: 1px solid var(--brand-secondary);
}

.btn-secondary:hover {
    background-color: darken(var(--brand-secondary), 5%); /* Placeholder for darker shade */
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.btn-danger {
    background-color: #dc3545; /* Bootstrap danger red */
    color: var(--text-light);
}

.btn-danger:hover {
    background-color: #c82333;
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    text-align: center;
    font-weight: 500;
}

.form-message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Filter Controls */
.filter-controls {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--text-light);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--brand-secondary);
}

.filter-controls .input-field,
.filter-controls .select-field {
    flex: 1 1 200px;
    min-width: 150px;
}

.filter-controls .btn {
    flex-shrink: 0;
}

/* Data Table */
.table-responsive {
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--text-light);
    border-radius: var(--border-radius-lg);
    overflow: hidden; /* Ensures rounded corners apply to table */
    box-shadow: var(--shadow-md);
}

.data-table th,
.data-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--brand-secondary);
}

.data-table th {
    background-color: var(--brand-secondary);
    color: var(--text-dark);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.data-table tbody tr:hover {
    background-color: rgba(var(--brand-secondary), 0.3);
}

.data-table .actions button {
    margin-right: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
    border-radius: var(--border-radius-sm);
}

/* Pagination */
.pagination-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--text-light);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--brand-secondary);
}

.pagination-controls button {
    background-color: var(--brand-secondary);
    color: var(--text-dark);
    border: 1px solid var(--brand-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.pagination-controls button:hover:not(:disabled) {
    background-color: var(--brand-primary);
    color: var(--text-light);
    transform: translateY(-2px);
}

.pagination-controls button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.pagination-controls span {
    font-weight: 600;
    padding: 0 var(--spacing-sm);
}

/* Modal */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1000; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--text-light);
    margin: auto;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    max-width: 500px;
    width: 90%;
    border: 1px solid var(--brand-secondary);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close-button {
    color: var(--text-dark);
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-md);
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
}

.close-button:hover,
.close-button:focus {
    color: var(--brand-primary);
    text-decoration: none;
}

.modal-content h2 {
    margin-top: 0;
    color: var(--brand-primary);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* Loading Skeletons */
.loading-skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    border-radius: var(--border-radius-sm);
    color: transparent; /* Hide text */
    pointer-events: none; /* Prevent interaction */
}

.loading-skeleton-text {
    height: 1.2em;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    border-radius: var(--border-radius-sm);
    width: 100%;
    display: block;
}

.stat-value.loading-skeleton {
    height: 2.5rem;
    width: 70%;
    margin: 0 auto;
}

#revenue-list .loading-skeleton-text {
    height: 2.5rem; /* Height of a table row */
    margin-bottom: 0;
    border-bottom: 1px solid var(--brand-secondary);
}
#revenue-list .loading-skeleton-text:last-child {
    border-bottom: none;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    .navbar nav {
        width: 100%;
        display: flex;
        justify-content: space-around;
    }
    .navbar nav a {
        flex-grow: 1;
        text-align: center;
        padding: var(--spacing-sm);
    }

    h1 {
        font-size: 2rem;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .filter-controls {
        flex-direction: column;
    }

    .filter-controls .input-field,
    .filter-controls .select-field,
    .filter-controls .btn {
        width: 100%;
        flex: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }

    .navbar nav a {
        font-size: 0.9rem;
    }

    h1 {
        font-size: 1.8rem;
    }

    .stat-value {
        font-size: 2rem;
    }

    .data-table th,
    .data-table td {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }

    .data-table .actions button {
        margin-right: var(--spacing-xs);
        padding: var(--spacing-xs);
        font-size: 0.75rem;
    }
}