/* -------------------------------------------------------------
   EXPENSE TRACKER - MODERN STYLING (GLASSMORPHISM & DARK NEON)
   ------------------------------------------------------------- */

/* Custom Variables */
:root {
    --bg-gradient-start: #0a0b10;
    --bg-gradient-end: #12131c;
    --panel-bg: rgba(22, 24, 37, 0.65);
    --panel-border: rgba(255, 255, 255, 0.08);
    --panel-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --primary: #8b5cf6;
    --primary-glow: rgba(139, 92, 246, 0.3);
    --secondary: #6366f1;
    --secondary-glow: rgba(99, 102, 241, 0.15);
    
    /* Category Colors */
    --color-food: #10b981;
    --color-food-glow: rgba(16, 185, 129, 0.15);
    
    --color-travel: #0ea5e9;
    --color-travel-glow: rgba(14, 165, 233, 0.15);
    
    --color-shopping: #8b5cf6;
    --color-shopping-glow: rgba(139, 92, 246, 0.15);
    
    --color-bills: #f59e0b;
    --color-bills-glow: rgba(245, 158, 11, 0.15);
    
    --color-other: #64748b;
    --color-other-glow: rgba(100, 116, 139, 0.15);
    
    --success: #10b981;
    --danger: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.2);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* App Container Layout */
.app-container {
    display: grid;
    grid-template-columns: 320px 1fr;
    min-height: 100vh;
    width: 100%;
}

/* Glassmorphism Panel Template */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--panel-shadow);
    padding: 24px;
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.glass-panel:hover {
    border-color: rgba(255, 255, 255, 0.15);
}

/* Sidebar Styling */
.sidebar {
    background: rgba(10, 11, 16, 0.85);
    border-right: 1px solid var(--panel-border);
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    overflow-y: auto;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo-icon {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px var(--primary-glow);
}

.brand h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 22px;
    font-weight: 700;
    background: linear-gradient(135deg, #fff, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Forms & Inputs styling */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
    font-weight: 600;
    pointer-events: none;
    font-size: 15px;
}

.input-group input {
    padding-left: 28px;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 15px;
    transition: all var(--transition-fast);
    outline: none;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 16px;
    padding-right: 40px;
    cursor: pointer;
}

select option {
    background-color: #12131c;
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    border: none;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.45);
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Main Content Area */
.main-content {
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 32px;
    overflow-y: auto;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.main-header h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff, #93c5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 15px;
}

.header-date {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--panel-border);
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Stats Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 20px;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
}

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-details {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.stat-value {
    font-family: 'Outfit', sans-serif;
    font-size: 28px;
    font-weight: 700;
    margin-top: 2px;
}

/* Color Themes for Stat Cards */
.stat-card.income::before {
    background: var(--success);
}
.stat-card.income .stat-icon {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}
.stat-card.income .stat-value {
    color: var(--success);
}

.stat-card.expenses::before {
    background: var(--danger);
}
.stat-card.expenses .stat-icon {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}
.stat-card.expenses .stat-value {
    color: var(--danger);
}

.stat-card.balance::before {
    background: var(--primary);
}
.stat-card.balance .stat-icon {
    background: rgba(139, 92, 246, 0.1);
    color: var(--primary);
}
.stat-card.balance .stat-value {
    color: var(--text-primary);
}
.stat-card.balance.negative-balance::before {
    background: var(--danger);
}
.stat-card.balance.negative-balance .stat-value {
    color: var(--danger);
}

/* Middle Layout Split */
.tracker-layout {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 24px;
    align-items: start;
}

/* History Section */
.history-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: 480px;
}

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

.section-header h3,
.insights-section h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 20px;
    font-weight: 600;
}

/* Custom Select wrapper in Header */
.filter-wrapper {
    min-width: 160px;
}

.filter-wrapper select {
    padding: 8px 32px 8px 12px;
    font-size: 14px;
    border-radius: var(--radius-sm);
}

/* Expense List container & elements */
.expense-list-container {
    position: relative;
    flex-grow: 1;
}

.expense-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 450px;
    overflow-y: auto;
    padding-right: 6px;
}

/* Custom scrollbar */
.expense-list::-webkit-scrollbar,
.sidebar::-webkit-scrollbar,
.main-content::-webkit-scrollbar {
    width: 6px;
}
.expense-list::-webkit-scrollbar-track,
.sidebar::-webkit-scrollbar-track,
.main-content::-webkit-scrollbar-track {
    background: transparent;
}
.expense-list::-webkit-scrollbar-thumb,
.sidebar::-webkit-scrollbar-thumb,
.main-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}
.expense-list::-webkit-scrollbar-thumb:hover,
.sidebar::-webkit-scrollbar-thumb:hover,
.main-content::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Expense Item Card */
.expense-item {
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    align-items: center;
    gap: 16px;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    animation: fadeIn var(--transition-normal);
}

.expense-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.08);
    transform: translateX(2px);
}

/* Category Badge Icon */
.item-category-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Category icon colors dynamically mapped classes */
.cat-food {
    background: var(--color-food-glow);
    color: var(--color-food);
}
.cat-travel {
    background: var(--color-travel-glow);
    color: var(--color-travel);
}
.cat-shopping {
    background: var(--color-shopping-glow);
    color: var(--color-shopping);
}
.cat-bills {
    background: var(--color-bills-glow);
    color: var(--color-bills);
}
.cat-other {
    background: var(--color-other-glow);
    color: var(--color-other);
}

.item-details {
    display: flex;
    flex-direction: column;
}

.item-name {
    font-weight: 600;
    font-size: 15px;
    color: var(--text-primary);
}

.item-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px;
}

.item-category-label {
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 500;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.cat-food-label { background: rgba(16, 185, 129, 0.1); color: var(--color-food); }
.cat-travel-label { background: rgba(14, 165, 233, 0.1); color: var(--color-travel); }
.cat-shopping-label { background: rgba(139, 92, 246, 0.1); color: var(--color-shopping); }
.cat-bills-label { background: rgba(245, 158, 11, 0.1); color: var(--color-bills); }
.cat-other-label { background: rgba(100, 116, 139, 0.1); color: var(--color-other); }

.item-amount {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 17px;
    color: var(--text-primary);
    margin-right: 8px;
}

/* Delete Button */
.btn-delete {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-delete:hover {
    color: var(--danger);
    background: var(--danger-glow);
}

/* No data state styling */
.no-data-alert {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    text-align: center;
    color: var(--text-secondary);
    padding: 64px 20px;
    border: 2px dashed rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
}

.no-data-alert svg {
    color: var(--text-muted);
}

/* Visual Insights & Graph Section */
.insights-section {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.insights-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 28px;
}

.chart-box {
    position: relative;
    width: 180px;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.donut-chart {
    width: 100%;
    height: 100%;
}

.donut-bg {
    stroke: rgba(255, 255, 255, 0.03);
}

.donut-fill {
    stroke: var(--primary);
    stroke-linecap: round;
    transition: stroke-dashoffset 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.chart-text {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.chart-percentage {
    font-family: 'Outfit', sans-serif;
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
}

.chart-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

/* Legend items for insights */
.legend {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.legend-placeholder {
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
    padding: 16px 0;
}

.legend-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    padding: 10px 14px;
    transition: all var(--transition-fast);
}

.legend-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.legend-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.legend-color {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-category {
    font-weight: 500;
    font-size: 14px;
    color: var(--text-primary);
}

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

.legend-value {
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 14px;
}

.legend-percent {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 500;
    min-width: 36px;
    text-align: right;
}

/* Screen reader only utility class */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* -------------------------------------------------------------
   ANIMATIONS & KEYFRAMES
   ------------------------------------------------------------- */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.expense-item.deleting {
    animation: fadeOut var(--transition-fast) forwards;
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(0.95);
        height: 0;
        padding-top: 0;
        padding-bottom: 0;
        margin-top: 0;
        margin-bottom: 0;
        border-width: 0;
    }
}

/* -------------------------------------------------------------
   RESPONSIVENESS (MEDIA QUERIES)
   ------------------------------------------------------------- */

/* Tablet view styling */
@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--panel-border);
        flex-direction: row;
        flex-wrap: wrap;
        align-items: flex-start;
        padding: 24px;
    }
    
    .brand {
        flex: 1 1 100%;
        margin-bottom: 0;
    }
    
    .income-panel,
    .expense-form-panel {
        flex: 1 1 calc(50% - 12px);
        min-width: 280px;
    }
    
    .main-content {
        padding: 24px;
    }
    
    .tracker-layout {
        grid-template-columns: 1fr;
    }
}

/* Mobile view styling */
@media (max-width: 768px) {
    .sidebar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .income-panel,
    .expense-form-panel {
        flex: 1 1 100%;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .main-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .header-date {
        align-self: flex-start;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .filter-wrapper {
        width: 100%;
    }
    
    .filter-wrapper select {
        width: 100%;
    }
    
    .insights-container {
        flex-direction: column;
        gap: 20px;
    }
}