:root {
    --bg-color: #191919;
    --sidebar-bg: #121212;
    --card-bg: #202020;
    --text-color: #ededed;
    --text-muted: #888888;
    --border-color: #333333;
    --input-bg: #1a1a1a;
    --accent-color: #7b68ee;
    /* Premium Violet/Blue */
    --accent-hover: #6a5acd;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-stack);
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
    font-size: 14px;
}

.app-container {
    display: flex;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 300px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    flex-shrink: 0;
    overflow-y: auto;
}

.sidebar-header h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.input-row {
    display: flex;
    gap: 12px;
}

.input-group.half {
    flex: 1;
}

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

input,
select {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 10px 12px;
    border-radius: 6px;
    font-family: inherit;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

input:focus,
select:focus {
    border-color: var(--accent-color);
}

/* Remove Arrows/Spinners */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type=number] {
    -moz-appearance: textfield;
}

/* Dark Mode for Dropdown Options */
select option {
    background-color: #191919;
    color: #ededed;
}

/* Fix for Focus/Hover states in some browsers */
select:focus>option:checked {
    background: #6366f1 !important;
    color: white !important;
}

/* Merged Input Group */
.merged-input-group {
    display: flex;
    align-items: center;
    /* Vertically center items */
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: border-color 0.2s;
    overflow: hidden;
    /* Ensure children don't overflow corners */
}

.merged-input-group:focus-within {
    border-color: var(--accent-color);
}

.merged-input-group select {
    width: 80px;
    /* Fixed compact width */
    flex-shrink: 0;
    border: none;
    background-color: transparent;
    padding: 10px 8px;
    /* Slightly tighter padding */
    text-align: center;
    cursor: pointer;
    outline: none;
}

.merged-input-group select:focus {
    border-color: transparent;
}

.merged-input-group input {
    flex-grow: 1;
    border: none;
    background-color: transparent;
    text-align: left;
    padding: 10px 12px 10px 16px;
    outline: none;
    border-left: 1px solid #333;
    /* Subtle separator */
}

.merged-input-group input:focus {
    border-color: transparent;
    border-left: 1px solid #333;
}

button#simulateBtn {
    width: 100%;
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    font-size: 14px;
    margin-top: 12px;
    transition: opacity 0.2s, background-color 0.2s;
}

button#simulateBtn:hover {
    background-color: var(--accent-hover);
}

/* Main Content */
.main-content {
    flex-grow: 1;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    overflow-y: auto;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.card-header h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-color);
}

.card-body {
    padding: 20px;
}

/* Chart */
.chart-card {
    position: relative;
    flex-grow: 1;
    /* Takes available space */
    height: 60vh;
    /* Explicit height hook for Chart.js */
    min-height: 400px;
    width: 100%;
}

.chart-card .card-body {
    flex-grow: 1;
    display: flex;
    /* Flex context for inner canvas */
    position: relative;
    height: 100%;
    overflow: hidden;
}

canvas#equityChart {
    width: 100% !important;
    height: 100% !important;
}

/* Stats */
.stats-card {
    flex-shrink: 0;
}

.stats-table {
    width: 100%;
    border-collapse: collapse;
}

.stats-table td {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
}

.stats-table tr:last-child td {
    border-bottom: none;
}

.stats-table td:first-child {
    color: var(--text-muted);
    font-weight: 500;
}

.stats-table td:last-child {
    text-align: right;
    color: var(--text-color);
    font-family: 'SF Mono', 'Segoe UI Mono', 'Roboto Mono', monospace;
    /* Monospace for numbers */
    font-variant-numeric: tabular-nums;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #333;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #444;
}