/* Modern SpendWise - Advanced UI Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Modern Color Palette */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-glass: rgba(255, 255, 255, 0.8);
    --bg-overlay: rgba(0, 0, 0, 0.5);
    
    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-inverse: #ffffff;
    
    /* Border & Shadows */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --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);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #ec4899 0%, #f43f5e 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    
    /* Spacing & Sizing */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Legacy Variables */
    --primary-color: var(--primary);
    --primary-hover: var(--primary-dark);
    --danger-color: var(--danger);
    --danger-hover: #dc2626;
    --border-color: var(--border-light);
    --card-bg: var(--bg-primary);
    --bg-color: var(--bg-secondary);
    --radius: var(--radius-md);
    --transition: all var(--transition-normal);
}

/* Dark Mode Variables */
body.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-glass: rgba(30, 41, 59, 0.8);
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-light: #334155;
    --border-medium: #475569;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
    --gradient-glass: linear-gradient(135deg, rgba(15, 23, 42, 0.8) 0%, rgba(30, 41, 59, 0.8) 100%);
    
    /* Legacy Variables */
    --border-color: var(--border-light);
    --card-bg: var(--bg-primary);
    --bg-color: var(--bg-secondary);
}

/* Base Styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    font-weight: 400;
    overflow-x: hidden;
    transition: background var(--transition-normal);
}

/* App Container */
.app-container {
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Animated Background */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    background: var(--gradient-primary);
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 300px;
    height: 300px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    top: 60%;
    right: 10%;
    animation-delay: 3s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    bottom: 20%;
    left: 30%;
    animation-delay: 5s;
}

.shape-4 {
    width: 250px;
    height: 250px;
    top: 30%;
    right: 30%;
    animation-delay: 7s;
}

.shape-5 {
    width: 180px;
    height: 180px;
    bottom: 10%;
    right: 20%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-30px) rotate(90deg); }
    50% { transform: translateY(20px) rotate(180deg); }
    75% { transform: translateY(-20px) rotate(270deg); }
}

/* Navigation Bar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-normal);
}

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

.brand-icon {
    font-size: 2rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.brand-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.brand-text span {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

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

.theme-toggle {
    background: var(--gradient-glass);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 1.25rem;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.nav-menu-btn {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

.nav-menu-btn:hover {
    background: var(--bg-tertiary);
}

/* Main Content */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    gap: var(--spacing-2xl);
    display: flex;
    flex-direction: column;
}

/* Hero Section */
.hero-section {
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    color: var(--text-inverse);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
}

.hero-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    animation: slideInLeft 0.6s ease;
}

.hero-text p {
    font-size: 1.125rem;
    opacity: 0.9;
    animation: slideInLeft 0.8s ease;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    animation: slideInRight 0.8s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.stat-card {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 140px;
    transition: all var(--transition-normal);
}

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

.stat-icon {
    font-size: 2rem;
    opacity: 0.8;
}

.stat-content h3 {
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0.9;
    margin: 0;
}

.stat-amount {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Quick Add Section */
.quick-add-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

.quick-add-section:hover {
    box-shadow: var(--shadow-lg);
}

.expand-btn {
    background: var(--gradient-primary);
    border: none;
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.25rem;
    transition: all var(--transition-normal);
}

.expand-btn:hover {
    transform: scale(1.1);
}

/* Modern Forms */
.expense-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.form-group {
    position: relative;
}

.floating-label {
    margin-bottom: var(--spacing-lg);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) var(--spacing-md);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-normal);
    outline: none;
}

.form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input:focus + .form-label,
.form-input:not(:placeholder-shown) + .form-label {
    top: -8px;
    left: var(--spacing-md);
    font-size: 0.75rem;
    background: var(--bg-primary);
    padding: 0 var(--spacing-sm);
    color: var(--primary);
}

.form-label {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 1rem;
    pointer-events: none;
    transition: all var(--transition-normal);
    z-index: 1;
}

.form-label.required::after {
    content: ' *';
    color: var(--danger);
}

.form-helper {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
    display: block;
}

.currency-symbol {
    position: absolute;
    left: var(--spacing-md);
    top: calc(var(--spacing-md) + 1.2rem);
    color: var(--text-secondary);
    font-weight: 500;
    pointer-events: none;
    z-index: 2;
    line-height: 1;
    font-size: 1rem;
}

/* Hide currency symbol when label is floating (input has focus or has value) */
.form-input:focus ~ .currency-symbol,
.form-input:not(:placeholder-shown) ~ .currency-symbol {
    display: none;
}

/* Only show currency symbol when label is in place (input empty and not focused) */
.form-input:placeholder-shown:not(:focus) ~ .currency-symbol {
    display: block;
}

.form-group input[type="number"] {
    padding-left: calc(var(--spacing-xl) + 8px);
}

/* Move label to the right to avoid overlap with currency symbol when in place */
.form-group:has(.currency-symbol) .form-label {
    left: calc(var(--spacing-md) + 20px);
}

/* When label floats up, move it back to normal position */
.form-group:has(.currency-symbol) .form-input:focus + .form-label,
.form-group:has(.currency-symbol) .form-input:not(:placeholder-shown) + .form-label {
    left: var(--spacing-md);
}

/* Modern Buttons */
.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-secondary:hover {
    background: var(--border-light);
    transform: translateY(-1px);
}

.btn-danger {
    background: var(--gradient-secondary);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-danger:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Analytics Section */
.analytics-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
}

.period-selector {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--bg-tertiary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
}

.period-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    color: var(--text-secondary);
}

.period-btn.active {
    background: var(--bg-primary);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.analytics-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.chart-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.chart-container h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.category-chart {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.insights-container h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.insight-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.insight-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-normal);
}

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

.insight-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
}

.insight-content h4 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0 0 var(--spacing-xs) 0;
}

.insight-content p {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

/* Actions Bar */
.actions-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.filter-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
}

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

.search-input {
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) var(--spacing-xl);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    width: 250px;
    transition: all var(--transition-normal);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    width: 300px;
}

.search-icon {
    position: absolute;
    left: var(--spacing-sm);
    color: var(--text-tertiary);
}

.filter-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* Expenses Section */
.expenses-section {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
}

.view-toggle {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--bg-tertiary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
}

.view-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    color: var(--text-secondary);
}

.view-btn.active {
    background: var(--bg-primary);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.expenses-container {
    margin-top: var(--spacing-lg);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.empty-state p {
    margin-bottom: var(--spacing-lg);
}

.expense-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-normal);
    animation: slideInUp 0.3s ease;
}

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

.expense-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.expense-details {
    flex: 1;
}

.expense-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

.expense-amount {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.expense-category {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.expense-date {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.expense-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-delete {
    background: var(--gradient-secondary);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-delete:hover {
    transform: scale(1.05);
}

/* Floating Action Button */
.fab {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: var(--shadow-xl);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-xl);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-light);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

.loading-spinner p {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Category Chart Bars */
.category-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.category-label {
    min-width: 80px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.bar-container {
    flex: 1;
    height: 24px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}

.bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 12px;
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: var(--spacing-sm);
    position: relative;
    overflow: hidden;
}

.bar-fill::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.bar-amount {
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        padding: var(--spacing-md);
    }
    
    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-stats {
        justify-content: center;
        width: 100%;
    }
    
    .analytics-grid {
        grid-template-columns: 1fr;
    }
    
    .actions-bar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-controls {
        justify-content: center;
    }
    
    .search-input {
        width: 100%;
    }
    
    .search-input:focus {
        width: 100%;
    }
    
    .expense-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .expense-actions {
        width: 100%;
        justify-content: flex-end;
    }
    
    .fab {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .hero-text h2 {
        font-size: 2rem;
    }
    
    .stat-card {
        min-width: 120px;
        padding: var(--spacing-md);
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .period-selector {
        flex-wrap: wrap;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-20 { margin-top: var(--spacing-lg); }
.mb-20 { margin-bottom: var(--spacing-lg); }
.fade-in { animation: fadeIn 0.5s ease; }

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

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

/* Header */
header {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 8px;
    font-weight: 700;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.dark-mode-toggle {
    position: absolute;
    top: 0;
    right: 0;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.dark-mode-toggle:hover {
    background-color: var(--border-color);
}

/* Sections */
section {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

section h2 {
    margin-bottom: 20px;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
}

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

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

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    background: var(--card-bg);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

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

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

.btn-danger {
    background: var(--gradient-secondary);
    color: white;
}

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

.btn-delete {
    background: var(--gradient-secondary);
    color: white;
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-delete:hover {
    transform: scale(1.05);
}

/* Summary Cards */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.summary-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: 24px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.summary-card h3 {
    font-size: 1rem;
    margin-bottom: 8px;
    opacity: 0.9;
}

.summary-card p {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
}

/* Filter Controls */
.filter-controls {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-controls select {
    flex: 1;
    min-width: 200px;
}

/* Category Breakdown */
.category-bars {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.category-bar {
    display: flex;
    align-items: center;
    gap: 16px;
}

.category-label {
    min-width: 100px;
    font-weight: 500;
    color: var(--text-primary);
}

.bar-container {
    flex: 1;
    height: 24px;
    background-color: var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}

.bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
    border-radius: 12px;
    transition: width 0.5s ease;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 8px;
}

.bar-amount {
    color: white;
    font-size: 0.875rem;
    font-weight: 500;
}

/* Expense List */
.expenses-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.expense-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-normal);
    animation: slideInUp 0.3s ease;
}

.expense-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.expense-details {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.expense-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.expense-meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    align-items: center;
}

.expense-amount {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.expense-category {
    background: var(--gradient-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.expense-date {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.expense-actions {
    display: flex;
    align-items: center;
}

.no-expenses {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px;
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 16px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    section {
        padding: 20px;
    }
    
    .summary-cards {
        grid-template-columns: 1fr;
    }
    
    .filter-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-controls select {
        min-width: auto;
    }
    
    .expense-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .expense-actions {
        width: 100%;
        justify-content: flex-end;
    }
    
    .expense-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.75rem;
    }
    
    section {
        padding: 16px;
    }
    
    .dark-mode-toggle {
        position: static;
        margin: 16px auto 0;
        display: block;
        width: fit-content;
    }
}

/* Animations */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}