/* ========================================
   Variables CSS
   ======================================== */
:root {
    /* Colores principales */
    --primary-color: #22c55e;
    --primary-dark: #16a34a;
    --primary-light: #86efac;

    /* Colores de estado */
    --income-color: #22c55e;
    --expense-color: #ef4444;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;

    /* Modo claro */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e5e5e5;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Otros */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Modo oscuro */
[data-theme="dark"] {
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* ========================================
   Reset y Base
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   Header
   ======================================== */
.header {
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.theme-toggle {
    background: var(--bg-secondary);
    border: none;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-primary);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: scale(1.05);
}

.theme-toggle svg {
    stroke-width: 2;
}

.sun-icon {
    display: block;
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

/* ========================================
   Balance Section
   ======================================== */
.balance-section {
    padding: 32px 0;
}

.balance-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    color: white;
    margin-bottom: 24px;
    animation: fadeInUp 0.5s ease;
}

.balance-label {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 8px;
}

.balance-amount {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 12px;
    animation: countUp 1s ease;
}

.balance-previous-month {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 20px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
}

.previous-month-label {
    font-size: 13px;
    opacity: 0.9;
    font-weight: 500;
}

.previous-month-amount {
    font-size: 16px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.95);
}

.balance-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.balance-item {
    background: rgba(255, 255, 255, 0.15);
    padding: 16px;
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.balance-item .label {
    display: block;
    font-size: 12px;
    opacity: 1;
    margin-bottom: 4px;
    font-weight: 500;
}

.balance-item .amount {
    display: block;
    font-size: 20px;
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.add-btn {
    width: 100%;
    padding: 16px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.add-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.add-btn:active {
    transform: translateY(0);
}

.add-btn svg {
    stroke-width: 2.5;
}

/* ========================================
   Filters
   ======================================== */
.filters-section {
    padding: 0 0 24px 0;
}

.filters {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 16px;
}

@media (min-width: 768px) {
    .filters {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

@media (min-width: 1200px) {
    .filters {
        grid-template-columns: 2fr repeat(5, 1fr) auto;
    }
}

.search-box {
    grid-column: 1 / -1;
}

@media (min-width: 768px) {
    .search-box {
        grid-column: 1 / 2;
    }
}

@media (min-width: 1200px) {
    .search-box {
        grid-column: 1 / 3;
    }
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box svg {
    position: absolute;
    left: 16px;
    color: var(--text-tertiary);
    stroke-width: 2;
}

.search-box input {
    width: 100%;
    padding: 12px 12px 12px 48px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-primary);
}

.filter-select,
.filter-date {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
    cursor: pointer;
}

.filter-select:focus,
.filter-date:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-primary);
}

#clearFilters {
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

#clearFilters svg {
    width: 16px;
    height: 16px;
}

.view-toggle {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.toggle-btn {
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

.toggle-btn:hover {
    background: var(--bg-secondary);
}

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

.toggle-btn svg {
    stroke-width: 2;
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    padding: 0 0 100px 0;
}

.transactions-view,
.chart-view {
    display: none;
}

.transactions-view.active,
.chart-view.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.transactions-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.transactions-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.transactions-count {
    font-size: 14px;
    color: var(--text-secondary);
}

.transactions-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Transaction Item */
.transaction-item {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
    animation: slideInRight 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.transaction-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--income-color);
}

.transaction-item.expense::before {
    background: var(--expense-color);
}

.transaction-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.transaction-info {
    flex: 1;
}

.transaction-category {
    display: inline-block;
    padding: 4px 12px;
    background: var(--bg-secondary);
    border-radius: 20px;
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.transaction-description {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.transaction-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.transaction-date {
    font-size: 13px;
    color: var(--text-tertiary);
}

.transaction-method {
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 6px;
    font-weight: 500;
}

.transaction-amount {
    font-size: 20px;
    font-weight: 700;
    margin-right: 12px;
}

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

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

.transaction-actions {
    display: flex;
    gap: 8px;
}

.btn-icon {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: var(--text-secondary);
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    transform: scale(1.1);
}

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

.btn-icon svg {
    stroke-width: 2;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-tertiary);
}

.empty-state svg {
    stroke-width: 1.5;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 16px;
    margin-bottom: 8px;
}

.empty-subtitle {
    font-size: 14px !important;
    opacity: 0.7;
}

/* ========================================
   Chart View
   ======================================== */
.chart-header {
    margin-bottom: 24px;
}

.chart-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.chart-container {
    background: var(--bg-primary);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

#expenseChart {
    max-width: 400px;
    max-height: 400px;
}

.chart-legend {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}

.legend-item {
    background: var(--bg-primary);
    padding: 16px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 12px;
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

.legend-label {
    flex: 1;
    font-size: 14px;
    color: var(--text-secondary);
}

.legend-amount {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.legend-percentage {
    font-size: 12px;
    color: var(--text-tertiary);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 16px 0;
    z-index: 50;
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.05);
}

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

.footer-info {
    font-size: 14px;
    color: var(--text-tertiary);
}

/* ========================================
   Buttons
   ======================================== */
.btn-primary {
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    padding: 12px 24px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--text-tertiary);
}

.btn-secondary svg,
.btn-primary svg {
    stroke-width: 2;
}

/* ========================================
   Modal
   ======================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fadeIn 0.2s ease;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: scaleIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-close svg {
    stroke-width: 2;
}

/* ========================================
   Form
   ======================================== */
form {
    padding: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    transition: var(--transition);
    font-family: 'Poppins', sans-serif;
}

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

.input-with-icon {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    font-weight: 600;
}

.input-with-icon input {
    padding-left: 40px;
}

/* Type Selector */
.type-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.type-option input[type="radio"] {
    display: none;
}

.type-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    background: var(--bg-secondary);
}

.type-label svg {
    stroke-width: 2;
}

.type-option input[type="radio"]:checked + .type-label {
    border-color: var(--primary-color);
    background: var(--primary-light);
    color: var(--primary-dark);
}

.type-label.income {
    color: var(--income-color);
}

.type-label.expense {
    color: var(--expense-color);
}

.type-option input[type="radio"]:checked + .type-label.income {
    background: rgba(34, 197, 94, 0.1);
    border-color: var(--income-color);
}

.type-option input[type="radio"]:checked + .type-label.expense {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--expense-color);
}

/* Form Actions */
.form-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 24px;
}

/* ========================================
   Install Prompt
   ======================================== */
.install-prompt {
    position: fixed;
    bottom: -200px;
    left: 20px;
    right: 20px;
    max-width: 500px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 20px;
    z-index: 1001;
    transition: bottom 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.install-prompt.active {
    bottom: 20px;
}

.install-content {
    display: flex;
    align-items: center;
    gap: 16px;
}

.install-content > div {
    flex: 1;
}

.install-content strong {
    display: block;
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.install-content p {
    font-size: 14px;
    color: var(--text-secondary);
}

.close-install {
    position: absolute;
    top: 8px;
    right: 8px;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-tertiary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.close-install:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* ========================================
   Toast Notifications
   ======================================== */
.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 1002;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    background: var(--bg-primary);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    animation: slideInRight 0.3s ease;
    border-left: 4px solid var(--primary-color);
}

.toast.success {
    border-left-color: var(--income-color);
}

.toast.error {
    border-left-color: var(--expense-color);
}

.toast.info {
    border-left-color: #3b82f6;
}

.toast-message {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.toast-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

/* ========================================
   Responsive Design
   ======================================== */
@media (min-width: 640px) {
    .filters {
        grid-template-columns: 2fr 1fr 1fr auto;
    }

    .balance-amount {
        font-size: 56px;
    }
}

@media (min-width: 768px) {
    .balance-card {
        padding: 40px;
    }

    .chart-container {
        padding: 48px;
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 40px;
    }

    .balance-details {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ========================================
   Scrollbar Personalizado
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ========================================
   Loading State
   ======================================== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ========================================
   Utility Classes
   ======================================== */
.text-center {
    text-align: center;
}

.hidden {
    display: none !important;
}

.fade-out {
    animation: fadeOut 0.3s ease forwards;
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: scale(0.9);
    }
}