/* Personal Expense Tracker - Vanilla CSS Styles */

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

:root {
    /* Color Palette - Professional Financial App Theme */
    --primary-hue: 195;
    --primary-sat: 85%;
    --primary-light: 41%;
    --primary-glow-light: 51%;
    
    --success-hue: 145;
    --success-sat: 80%;
    --success-light: 42%;
    
    --warning-hue: 43;
    --warning-sat: 89%;
    --warning-light: 60%;
    
    --destructive-hue: 0;
    --destructive-sat: 75%;
    --destructive-light: 60%;
    
    /* Main Colors */
    --background: hsl(250, 50%, 99%);
    --foreground: hsl(215, 25%, 27%);
    --card: hsl(0, 0%, 100%);
    --card-foreground: hsl(215, 25%, 27%);
    --primary: hsl(var(--primary-hue), var(--primary-sat), var(--primary-light));
    --primary-glow: hsl(var(--primary-hue), var(--primary-sat), var(--primary-glow-light));
    --secondary: hsl(210, 11%, 96%);
    --secondary-foreground: hsl(215, 25%, 27%);
    --muted: hsl(210, 11%, 96%);
    --muted-foreground: hsl(215, 10%, 55%);
    --accent: hsl(var(--success-hue), var(--success-sat), var(--success-light));
    --success: hsl(var(--success-hue), var(--success-sat), var(--success-light));
    --warning: hsl(var(--warning-hue), var(--warning-sat), var(--warning-light));
    --destructive: hsl(var(--destructive-hue), var(--destructive-sat), var(--destructive-light));
    --border: hsl(214, 13%, 92%);
    --input-border: hsl(214, 13%, 92%);
    
    /* Shadows */
    --shadow-card: 0 4px 6px -1px hsla(215, 25%, 27%, 0.1), 0 2px 4px -1px hsla(215, 25%, 27%, 0.06);
    --shadow-hover: 0 10px 15px -3px hsla(215, 25%, 27%, 0.1), 0 4px 6px -2px hsla(215, 25%, 27%, 0.05);
    
    /* Spacing */
    --radius: 0.75rem;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(to bottom right, var(--background), hsl(250, 50%, 97%));
    color: var(--foreground);
    line-height: 1.6;
    min-height: 100vh;
}

.app {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
}

/* Header Styles */
.header {
    margin-bottom: var(--spacing-xl);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.header-title h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--foreground);
    margin-bottom: var(--spacing-xs);
}

.header-title p {
    color: var(--muted-foreground);
    font-size: 1rem;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    min-height: 2.5rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-gradient {
    background: linear-gradient(135deg, var(--primary), var(--primary-glow));
    color: white;
    box-shadow: var(--shadow-card);
}

.btn-gradient:hover:not(:disabled) {
    box-shadow: var(--shadow-hover);
    transform: translateY(-1px) scale(1.02);
}

.btn-outline {
    background: var(--card);
    color: var(--card-foreground);
    border: 1px solid var(--border);
}

.btn-outline:hover:not(:disabled) {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.btn-ghost {
    background: transparent;
    color: var(--muted-foreground);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--secondary);
    color: var(--secondary-foreground);
}

.icon {
    font-size: 1rem;
}

/* Summary Cards */
.summary-section {
    margin-bottom: var(--spacing-xl);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.summary-card {
    background: linear-gradient(145deg, var(--card), hsl(210, 11%, 98%));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-card);
    transition: all 0.3s ease;
}

.summary-card:hover {
    box-shadow: var(--shadow-hover);
}

.summary-card.today-card {
    border-left: 4px solid var(--accent);
}

.summary-card.week-card {
    border-left: 4px solid var(--primary);
}

.summary-card.month-card {
    border-left: 4px solid var(--success);
}

.summary-card.year-card {
    border-left: 4px solid var(--warning);
}

.summary-card.filtered-card {
    border-left: 4px solid var(--destructive);
}

.summary-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.summary-icon {
    font-size: 1rem;
}

.summary-title {
    font-size: 0.875rem;
    color: var(--muted-foreground);
    font-weight: 500;
}

.summary-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--card-foreground);
}

/* Highlights */
.highlights-section {
    margin-bottom: var(--spacing-xl);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.highlight-card {
    background: var(--card);
    border: 1px solid;
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-card);
}

.highlight-card.highest-card {
    background: linear-gradient(to bottom right, hsla(0, 75%, 60%, 0.05), hsla(0, 75%, 60%, 0.1));
    border-color: hsla(0, 75%, 60%, 0.2);
}

.highlight-card.lowest-card {
    background: linear-gradient(to bottom right, hsla(145, 80%, 42%, 0.05), hsla(145, 80%, 42%, 0.1));
    border-color: hsla(145, 80%, 42%, 0.2);
}

.highlight-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.highlight-icon {
    font-size: 1rem;
}

.highlight-title {
    font-size: 0.875rem;
    font-weight: 500;
}

.highest-card .highlight-title {
    color: var(--destructive);
}

.lowest-card .highlight-title {
    color: var(--success);
}

.highlight-amount {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.highlight-description {
    font-size: 0.875rem;
    color: var(--muted-foreground);
}

/* Filters */
.filters-section {
    margin-bottom: var(--spacing-xl);
}

.filters-card {
    background: linear-gradient(145deg, var(--card), hsl(210, 11%, 98%));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
}

.filters-content {
    padding: var(--spacing-lg);
}

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

.search-input-container {
    position: relative;
    flex: 1;
    min-width: 200px;
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted-foreground);
    font-size: 0.875rem;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 2.5rem;
    border: 1px solid var(--input-border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    background: var(--card);
    color: var(--card-foreground);
    transition: all 0.2s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.12);
}

.period-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--input-border);
    border-radius: var(--radius);
    background: var(--card);
    color: var(--card-foreground);
    font-size: 0.875rem;
    cursor: pointer;
    min-width: 140px;
}

.period-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.12);
}

.expanded-filters {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
}

.filters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    align-items: end;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.filter-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--card-foreground);
}

.filter-select,
.date-input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--input-border);
    border-radius: var(--radius);
    background: var(--card);
    color: var(--card-foreground);
    font-size: 0.875rem;
}

.filter-select:focus,
.date-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.12);
}

.date-range {
    display: flex;
    gap: var(--spacing-sm);
}

.filter-actions {
    display: flex;
    align-items: end;
}

/* Main Content */
.main-content {
    margin-bottom: var(--spacing-xl);
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
}

@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* Chart Section */
.chart-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chart-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--foreground);
}

.chart-controls {
    display: flex;
    gap: var(--spacing-xs);
}

.chart-btn {
    width: 2rem;
    height: 2rem;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--card);
    color: var(--muted-foreground);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
}

.chart-btn:hover {
    background: var(--secondary);
    color: var(--secondary-foreground);
}

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

.chart-card {
    background: linear-gradient(145deg, var(--card), hsl(210, 11%, 98%));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-card);
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-legend {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
}

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

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.legend-text {
    color: var(--muted-foreground);
    font-size: 0.75rem;
}

/* Expenses Section */
.expenses-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.expenses-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--foreground);
}

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

.expense-card {
    background: linear-gradient(145deg, var(--card), hsl(210, 11%, 98%));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-card);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.expense-card:hover {
    box-shadow: var(--shadow-hover);
}

.expense-card:hover .expense-actions {
    opacity: 1;
}

.expense-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.expense-info {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    flex: 1;
}

.expense-icon {
    font-size: 1.5rem;
    margin-top: var(--spacing-xs);
}

.expense-details h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--card-foreground);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.expense-category {
    display: inline-block;
    background: var(--secondary);
    color: var(--secondary-foreground);
    padding: 2px var(--spacing-sm);
    border-radius: calc(var(--radius) * 0.5);
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.expense-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    font-size: 0.875rem;
    color: var(--muted-foreground);
}

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

.expense-amount-value {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--card-foreground);
}

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

.expense-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.expense-action-btn {
    width: 2rem;
    height: 2rem;
    padding: 0;
    border: none;
    border-radius: var(--radius);
    background: transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
}

.expense-action-btn.edit-btn:hover {
    background: hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.1);
    color: var(--primary);
}

.expense-action-btn.delete-btn:hover {
    background: hsla(var(--destructive-hue), var(--destructive-sat), var(--destructive-light), 0.1);
    color: var(--destructive);
}

/* No Data State */
.no-data {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--muted-foreground);
    background: linear-gradient(145deg, var(--card), hsl(210, 11%, 98%));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    min-height: 200px;
}

.no-data div:first-child {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.no-data p {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.no-data small {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal-content {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-hover);
    width: 100%;
    max-width: 400px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--card-foreground);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Form Styles */
.expense-form {
    padding: var(--spacing-lg);
}

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

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--card-foreground);
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--input-border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    background: var(--card);
    color: var(--card-foreground);
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.12);
}

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

.error-message {
    font-size: 0.75rem;
    color: var(--destructive);
    margin-top: var(--spacing-xs);
    display: none;
}

.error-message.show {
    display: block;
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: var(--destructive);
}

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

.form-actions .btn:first-child {
    flex: 1;
}

/* Toast Styles */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-hover);
    max-width: 350px;
    animation: slideInRight 0.3s ease;
    position: relative;
    overflow: hidden;
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--destructive);
}

.toast-header {
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
}

.toast-message {
    font-size: 0.875rem;
    color: var(--muted-foreground);
}

.toast-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--muted-foreground);
    font-size: 1rem;
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: calc(var(--radius) * 0.5);
}

.toast-close:hover {
    background: var(--secondary);
}

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

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .app {
        padding: var(--spacing-md);
    }
    
    .header-content {
        flex-direction: column;
        align-items: stretch;
    }
    
    .summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .filters-row {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-input-container {
        min-width: auto;
    }
    
    .period-select {
        min-width: auto;
    }
    
    .filters-grid {
        grid-template-columns: 1fr;
    }
    
    .date-range {
        flex-direction: column;
    }
    
    .expense-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .expense-actions {
        opacity: 1;
        align-self: flex-end;
    }
    
    .expense-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }
    
    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    .toast {
        max-width: none;
    }
}

@media (max-width: 480px) {
    .summary-grid {
        grid-template-columns: 1fr;
    }
    
    .highlights-grid {
        grid-template-columns: 1fr;
    }
    
    .chart-card {
        height: 250px;
    }
}