/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --bg-dark: #0D0D0D;
    --bg-light: #FFFFFF;
    --card-bg: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --text-dark: #1A1A1A;
    
    /* Gradient Colors */
    --gradient-purple: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-blue: linear-gradient(135deg, #6B73FF 0%, #000DFF 100%);
    --gradient-pink: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-teal: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-green: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    
    /* Shadows */
    --shadow-soft: 0 8px 32px rgba(31, 38, 135, 0.37);
    --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-fab: 0 8px 24px rgba(107, 115, 255, 0.4);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Typography */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;
    
    /* Transitions */
    --transition: all 0.3s ease-in-out;
}

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

body.light-theme {
    background: var(--bg-light);
    color: var(--text-dark);
    --text-primary: #1A1A1A;
    --text-secondary: #6B6B6B;
    --card-bg: rgba(0, 0, 0, 0.05);
    --glass-bg: rgba(255, 255, 255, 0.8);
}

/* App Container */
.app-container {
    min-height: 100vh;
    padding-bottom: 80px; /* Space for bottom nav */
}

/* Header Styles */
.app-header {
    padding: var(--spacing-lg) var(--spacing-md);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.app-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.sync-btn, .add-btn, .back-btn, .close-btn {
    background: var(--card-bg);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.sync-btn:hover, .add-btn:hover, .back-btn:hover, .close-btn:hover {
    background: var(--gradient-blue);
    transform: translateY(-2px);
}

.profile-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-purple);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

/* Period Toggle */
.period-toggle {
    display: flex;
    margin: var(--spacing-md);
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xs);
    backdrop-filter: blur(10px);
}

.toggle-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.toggle-btn.active {
    background: var(--gradient-blue);
    color: white;
    box-shadow: var(--shadow-soft);
}

/* Dashboard Cards */
.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-md);
    padding: 0 var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-blue);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.expense-card::before { background: var(--gradient-pink); }
.income-card::before { background: var(--gradient-green); }
.upcoming-card::before { background: var(--gradient-teal); }
.balance-card::before { background: var(--gradient-purple); }

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--gradient-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: white;
}

.expense-card .card-icon { background: var(--gradient-pink); }
.income-card .card-icon { background: var(--gradient-green); }
.upcoming-card .card-icon { background: var(--gradient-teal); }
.balance-card .card-icon { background: var(--gradient-purple); }

.card-content h3 {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.card-content .amount {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
}

/* Charts Section */
.charts-section {
    padding: 0 var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.chart-container {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.chart-container h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-md);
    font-weight: 600;
}

.chart-container canvas {
    max-width: 100%;
    height: auto;
}

/* Floating Action Button */
.fab-container {
    position: fixed;
    bottom: 100px;
    right: var(--spacing-md);
    z-index: 1000;
}

.fab {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    position: relative;
}

.main-fab {
    background: var(--gradient-blue);
    box-shadow: var(--shadow-fab);
}

.main-fab:hover {
    transform: scale(1.1);
}

.fab-menu {
    position: absolute;
    bottom: 70px;
    right: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    transform: translateY(20px);
}

.fab-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.fab-menu .fab {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-right: var(--spacing-lg);
    border-radius: var(--radius-lg);
    width: auto;
    min-width: 140px;
    justify-content: flex-start;
    padding-left: var(--spacing-md);
}

.expense-fab { background: var(--gradient-pink); }
.income-fab { background: var(--gradient-green); }
.upcoming-fab { background: var(--gradient-teal); }

.fab-menu span {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-around;
    padding: var(--spacing-sm) 0;
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    transition: var(--transition);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    min-width: 60px;
}

.nav-item:hover, .nav-item.active {
    color: var(--text-primary);
    background: var(--card-bg);
}

.nav-item i {
    margin-bottom: var(--spacing-xs);
}

.nav-item span {
    font-size: var(--font-size-xs);
    font-weight: 500;
}

/* Filters Section */
.filters-section {
    padding: var(--spacing-md);
    background: var(--card-bg);
    margin: var(--spacing-md);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px);
}

.filter-group {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.filter-select, .date-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    background: #000000;
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}

.date-filter {
    display: flex;
    gap: var(--spacing-md);
}

/* Expense List */
.expense-list {
    padding: 0 var(--spacing-md);
}

.expense-item {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition);
}

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

.expense-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.expense-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--gradient-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.expense-details h4 {
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.expense-details p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.expense-amount {
    text-align: right;
}

.expense-amount .amount {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
}

.expense-amount .method {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    padding: var(--spacing-md);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-header h3 {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Form Styles */
.expense-form, .income-form, .upcoming-form, .quick-add-form {
    padding: var(--spacing-lg);
}

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

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

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    background: var(--glass-bg);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    transition: var(--transition);
    font-size: var(--font-size-md);
}

.form-group select{
    background-color: #000000;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: #6B73FF;
    box-shadow: 0 0 0 3px rgba(107, 115, 255, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.btn-primary, .btn-secondary {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: var(--gradient-blue);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

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

/* Quick Add Modal Specific Styles */
.quick-add-modal .modal-content {
    max-width: 400px;
}

.quick-add-form .form-group {
    margin-bottom: var(--spacing-sm);
}

.quick-add-form .form-group input,
.quick-add-form .form-group select {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.quick-add-form .btn-primary,
.quick-add-form .btn-secondary {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* Responsive Design */
@media (max-width: 768px) {
    .dashboard-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .filter-group {
        flex-direction: column;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .fab-menu .fab {
        min-width: 120px;
        font-size: var(--font-size-xs);
    }
    
    .quick-add-modal .modal-content {
        max-width: 95%;
        margin: 0 var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .dashboard-cards {
        /* grid-template-columns: 1fr; */
        grid-template-columns: repeat(2, 1fr);

    }
    
    .period-toggle {
        margin: var(--spacing-sm);
    }
    
    .expense-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .expense-amount {
        text-align: left;
        width: 100%;
    }
    
    .fab-menu .fab {
        min-width: 100px;
    }
}

/* Loading States */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid #6B73FF;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

/* Success Message */
.success-message {
    background: var(--gradient-green);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Error Message */
.error-message {
    background: var(--gradient-pink);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.3s ease-in-out;
}

.slide-up {
    animation: slideUp 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.mt-0 { margin-top: 0; }
.hidden { display: none; }
.show { display: block; }