:root {
    /* Color Palette - Gold/Slate */
    --gold-500: #d4af37;
    --gold-600: #c5a028;
    --gold-100: #fbf7e6;
    
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-600: #475569;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    
    --bg-color: var(--slate-50);
    --panel-bg: #ffffff;
    --text-main: var(--slate-900);
    --text-muted: var(--slate-600);
    --border-color: var(--slate-200);
    
    --metric-bg: var(--slate-50);
    --metric-border: var(--slate-200);
    
    --chart-grid: rgba(0, 0, 0, 0.05);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --shadow-premium: 0 10px 25px -5px rgba(0,0,0,0.05), 0 8px 10px -6px rgba(0,0,0,0.01);
    
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.4);
    
    --transition: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-color: #0b0f19;
    --panel-bg: var(--slate-900);
    --text-main: var(--slate-50);
    --text-muted: var(--slate-300);
    --border-color: var(--slate-800);
    
    --metric-bg: rgba(30, 41, 59, 0.5);
    --metric-border: var(--slate-800);
    
    --chart-grid: rgba(255, 255, 255, 0.05);
    
    --glass-bg: rgba(15, 23, 42, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.2);
    --shadow-premium: 0 10px 25px -5px rgba(0,0,0,0.4);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    transition: background-color var(--transition), color var(--transition);
    min-height: 100vh;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
}

/* Header */
header {
    margin-bottom: 2rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--gold-500);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.025em;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.icon-btn:hover {
    color: var(--text-main);
    background: var(--metric-bg);
}

/* Dashboard Layout */
.dashboard {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 1.5rem;
    align-items: start;
}

@media (max-width: 1024px) {
    .dashboard {
        grid-template-columns: 1fr;
    }
}

/* Panels */
.panel {
    background: var(--panel-bg);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: all var(--transition);
}

.panel:hover {
    box-shadow: var(--shadow-premium);
}

.panel h2 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.panel-header h2 {
    margin-bottom: 0;
}

/* Inputs */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

select, input[type="number"] {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.9375rem;
    transition: all var(--transition);
    appearance: none;
}

select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

[data-theme="dark"] select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23cbd5e1' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
}

select:focus, input[type="number"]:focus {
    outline: none;
    border-color: var(--gold-500);
    box-shadow: 0 0 0 2px rgba(212, 175, 55, 0.2);
}

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

.input-with-currency .currency-symbol {
    position: absolute;
    left: 1rem;
    color: var(--text-muted);
    font-weight: 500;
    pointer-events: none;
}

.input-with-currency input {
    padding-left: 2rem;
    font-size: 1.125rem;
    font-weight: 600;
}

.highlight-input {
    background: var(--metric-bg);
    padding: 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

/* Toggle Group */
.toggle-group {
    display: flex;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    padding: 0.25rem;
}

.toggle-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    border-radius: calc(var(--radius-sm) - 2px);
    cursor: pointer;
    transition: all var(--transition);
}

.toggle-btn.active {
    background: var(--panel-bg);
    color: var(--text-main);
    box-shadow: var(--shadow-sm);
}

/* Range Slider */
input[type="range"] {
    width: 100%;
    margin-top: 1rem;
    opacity: 0.8;
    transition: opacity var(--transition);
    cursor: pointer;
    background: transparent;
    appearance: none;
}

input[type="range"]:hover {
    opacity: 1;
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--gold-500);
    margin-top: -6px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Results Section */
.results-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
}

.metric-card {
    background: var(--panel-bg);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.metric-card.primary {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.1) 0%, rgba(212, 175, 55, 0.02) 100%);
    border-color: rgba(212, 175, 55, 0.3);
}

.metric-card h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.metric-card .metric-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.025em;
    margin-bottom: 0.25rem;
}

.metric-card.primary .metric-value {
    color: var(--gold-600);
}

[data-theme="dark"] .metric-card.primary .metric-value {
    color: var(--gold-500);
}

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

/* Chart */
.chart-panel {
    min-height: 350px;
}

.chart-wrapper {
    position: relative;
    height: 300px;
    width: 100%;
}

/* Table */
.breakdown-panel {
    overflow: hidden;
}

.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

th, td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border-color);
    text-align: left;
}

th {
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

th.text-right, td.text-right {
    text-align: right;
}

tr:hover td {
    background: var(--metric-bg);
}

.total-row {
    background: var(--metric-bg);
}

.total-row td {
    border-bottom: none;
    border-top: 2px solid var(--border-color);
    padding-top: 1rem;
}

.total-row.highlight td {
    color: var(--text-main);
    font-size: 1.0625rem;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.05));
}

.amount-cell {
    font-variant-numeric: tabular-nums;
    font-weight: 500;
}

.amount-cell.negative {
    color: #ef4444;
}

/* Buttons */
.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--gold-500);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition);
}

.action-btn:hover {
    background: var(--gold-600);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(212, 175, 55, 0.2);
}

.toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    background: var(--slate-800);
    color: white;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    font-weight: 500;
    font-size: 0.875rem;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}