/* Variables CSS para modo claro y oscuro */
:root {
    --primary-color: #4CAF50;
    --primary-light: #81C784;
    --primary-dark: #388E3C;
    --secondary-color: #FF9800;
    --income-color: #4CAF50;
    --expense-color: #F44336;
    --background-color: #F5F5F5;
    --surface-color: #FFFFFF;
    --text-color: #212121;
    --text-secondary: #757575;
    --border-color: #E0E0E0;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --bottom-nav-height: 70px;
}

/* Modo oscuro */
[data-theme="dark"] {
    --primary-color: #66BB6A;
    --primary-light: #81C784;
    --primary-dark: #388E3C;
    --secondary-color: #FFB74D;
    --income-color: #66BB6A;
    --expense-color: #EF5350;
    --background-color: #121212;
    --surface-color: #1E1E1E;
    --text-color: #E0E0E0;
    --text-secondary: #9E9E9E;
    --border-color: #333333;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Estilos generales */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    padding-bottom: var(--bottom-nav-height); /* Espacio para el menú inferior */
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-md) calc(var(--bottom-nav-height) + var(--spacing-md));
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-color);
}

.theme-toggle button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-color);
    padding: var(--spacing-xs);
    border-radius: 50%;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
}

.theme-toggle button:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .theme-toggle button:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Contenido principal */
.main-content {
    min-height: calc(100vh - 200px); /* Ajuste para el menú inferior */
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

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

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

/* Sección de resumen */
.balance-section {
    margin-bottom: var(--spacing-lg);
}

.balance-card {
    background-color: var(--surface-color);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    text-align: center;
    border-top: 6px solid var(--primary-color);
}

.balance-card h2 {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.balance-amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: var(--spacing-xs);
}

.balance-period {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Sección de próximos gastos */
.upcoming-section {
    margin-bottom: var(--spacing-lg);
}

.upcoming-section h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.upcoming-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-sm);
}

.upcoming-item {
    background-color: var(--surface-color);
    border-radius: var(--radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    border-left: 4px solid var(--expense-color);
}

.upcoming-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.upcoming-description {
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.upcoming-amount {
    font-weight: 700;
    color: var(--expense-color);
    margin-top: auto;
}

.empty-upcoming {
    grid-column: 1 / -1;
    background-color: var(--surface-color);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow);
    color: var(--text-secondary);
}

.empty-upcoming i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    opacity: 0.5;
}

/* Encabezados de formularios */
.form-header, .history-header {
    background-color: var(--surface-color);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
    border-top: 6px solid var(--primary-color);
}

.form-header h2, .history-header h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
}

.form-header p, .history-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Formularios de transacciones */
.transaction-form {
    background-color: var(--surface-color);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.form-group {
    flex: 1;
    min-width: 200px;
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
    font-weight: 500;
}

.form-group select,
.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--surface-color);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn-submit {
    width: 100%;
    padding: 0.9rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.income-btn {
    background-color: var(--income-color);
    color: white;
}

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

.expense-btn {
    background-color: var(--expense-color);
    color: white;
}

.expense-btn:hover {
    background-color: #D32F2F;
}

/* Historial de transacciones */
.history-filters {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.filter-btn {
    padding: 0.5rem 1rem;
    background-color: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.9rem;
}

.filter-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.history-list {
    background-color: var(--surface-color);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s;
}

.history-item:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .history-item:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

.history-item:last-child {
    border-bottom: none;
}

.history-item.income {
    border-left: 4px solid var(--income-color);
}

.history-item.expense {
    border-left: 4px solid var(--expense-color);
}

.history-info {
    flex: 1;
}

.history-category {
    font-weight: 600;
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.history-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.history-date {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.history-amount {
    font-weight: 700;
    font-size: 1.1rem;
}

.history-amount.income {
    color: var(--income-color);
}

.history-amount.expense {
    color: var(--expense-color);
}

.history-actions {
    display: flex;
    gap: 0.5rem;
    margin-left: 1rem;
}

.history-actions button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1rem;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
}

.history-actions button:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--text-color);
}

[data-theme="dark"] .history-actions button:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.empty-history {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-secondary);
}

.empty-history i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    opacity: 0.5;
}

/* Menú inferior */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--surface-color);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 0.5rem 0;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 100;
    height: var(--bottom-nav-height);
    max-width: 800px;
    margin: 0 auto;
    border-top: 1px solid var(--border-color);
    border-radius: 20px 20px 0 0;
    width: calc(100% - 2rem);
    left: 1rem;
    right: 1rem;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.3s;
    flex: 1;
    max-width: 25%;
}

.nav-item i {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.nav-item span {
    font-size: 0.75rem;
    font-weight: 500;
}

.nav-item.active {
    color: var(--primary-color);
    background-color: rgba(76, 175, 80, 0.1);
}

.nav-item:hover:not(.active) {
    color: var(--text-color);
    background-color: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .nav-item:hover:not(.active) {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-md) 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: var(--spacing-lg);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

#reset-data {
    color: var(--expense-color);
    cursor: pointer;
    text-decoration: underline;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--surface-color);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    max-width: 400px;
    width: 90%;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: var(--bottom-nav-height);
}

.modal-content h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.modal-content p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

.modal-buttons button {
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s;
}

#cancel-delete, #cancel-reset {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

#confirm-delete, #confirm-reset {
    background-color: var(--expense-color);
    border: none;
    color: white;
}

#cancel-delete:hover, #cancel-reset:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

#confirm-delete:hover, #confirm-reset:hover {
    background-color: #C62828;
}

/* Estilos para selectores de día */
.month-calendar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
    gap: 0.5rem;
    padding: 1rem;
    background-color: rgba(76, 175, 80, 0.05);
    border-radius: 8px;
}

.calendar-day-btn {
    padding: 0.5rem 0.3rem;
    border: 2px solid var(--border-color);
    background-color: var(--surface-color);
    color: var(--text-color);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
    font-size: 0.9rem;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calendar-day-btn:hover {
    border-color: var(--primary-color);
    background-color: rgba(76, 175, 80, 0.1);
}

.calendar-day-btn.selected {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.days-of-week-picker {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    padding: 1rem;
    background-color: rgba(76, 175, 80, 0.05);
    border-radius: 8px;
}

.days-of-week-picker label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 500;
}

.days-of-week-picker input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-sm) var(--spacing-sm) calc(var(--bottom-nav-height) + var(--spacing-sm));
    }
    
    .balance-amount {
        font-size: 2.5rem;
    }
    
    .upcoming-list {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .form-group {
        min-width: 100%;
    }
    
    .nav-item span {
        font-size: 0.7rem;
    }
    
    /* En mobile, el menú ocupa todo el ancho sin bordes redondeados */
    .bottom-nav {
        border-radius: 0;
        width: 100%;
        left: 0;
        right: 0;
    }
}

@media (max-width: 480px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .theme-toggle {
        align-self: flex-end;
        margin-top: -3.5rem;
    }
    
    .balance-amount {
        font-size: 2rem;
    }
    
    .history-filters {
        flex-wrap: wrap;
    }
    
    .nav-item i {
        font-size: 1.3rem;
    }
    
    .nav-item span {
        font-size: 0.65rem;
    }
}