:root {
    /* Dark Theme (Default) */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --border: #334155;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);

    --font-main: 'Inter', sans-serif;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #059669;
    --danger: #dc2626;
    --warning: #d97706;
    --border: #e2e8f0;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    zoom: 0.9;
    line-height: 1.5;
    transition: background-color 0.3s, color 0.3s;
    min-height: 100vh;
}

/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 0.5rem 1rem;
    /* Reduced padding to match main content */
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.header-left h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

#last-updated {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.header-controls {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-group label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

select {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

select:hover {
    border-color: var(--accent);
}

select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* Refresh Button */
#refresh-btn {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background-color 0.2s;
}

#refresh-btn:hover {
    background-color: var(--accent-hover);
}

#refresh-btn:active {
    transform: translateY(1px);
}

.btn-icon {
    font-size: 1rem;
    transition: transform 0.5s;
}

#refresh-btn.loading .btn-icon {
    animation: spin 1s linear infinite;
}

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

/* Theme Toggle */
.theme-toggle {
    position: relative;
    width: 48px;
    height: 24px;
}

.theme-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-toggle label {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-tertiary);
    transition: .4s;
    border-radius: 24px;
}

.theme-toggle label:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

.theme-toggle input:checked+label {
    background-color: var(--accent);
}

.theme-toggle input:checked+label:before {
    transform: translateX(24px);
}

/* Main Content */
main {
    padding: 1rem;
    /* Reduced padding */
    max-width: 98%;
    /* Increased max-width to nearly full screen */
    margin: 0 auto;
}

.table-container {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow-x: auto;
    /* Enable horizontal scroll */
    box-shadow: var(--shadow);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

th {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    font-weight: 600;
    text-align: left;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
    position: sticky;
    top: 0;
    transition: color 0.2s;
}

th:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

td {
    padding: 1rem 1.25rem;
    /* Increased padding */
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
    vertical-align: middle;
    white-space: nowrap;
    /* Prevent wrapping for cleaner look */
}

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

tr:hover {
    background-color: var(--bg-tertiary);
}

/* Column Specifics */
.symbol-cell {
    font-weight: 700;
    color: var(--text-primary);
}

.name-sub {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.price-cell {
    font-family: 'Inter', monospace;
    /* Monospace for numbers alignment */
    font-weight: 600;
}

.change-cell {
    font-weight: 600;
}

.alpha-cell {
    font-weight: 600;
    font-family: 'Inter', monospace;
}

.positive {
    color: var(--success);
}

.negative {
    color: var(--danger);
}

/* Group Headers */
.group-header {
    background-color: var(--bg-tertiary) !important;
    border-top: 2px solid var(--border);
    border-bottom: 2px solid var(--border);
}

.group-header td {
    padding: 0.75rem 1.25rem !important;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    font-weight: 700;
}

.group-header:hover {
    background-color: var(--bg-tertiary) !important;
}

.trend-cell {
    width: 120px;
    padding: 0.5rem;
}

.sparkline-canvas {
    width: 100%;
    height: 40px;
}

.rsi-cell {
    font-weight: 600;
}

.rsi-overbought {
    color: var(--danger);
}

.rsi-oversold {
    color: var(--success);
}

.signal-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.signal-buy {
    background-color: rgba(16, 185, 129, 0.2);
    color: var(--success);
}

.signal-sell {
    background-color: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

/* Sort Icons */
.sort-icon::after {
    content: '↕';
    margin-left: 0.5rem;
    opacity: 0.3;
    font-size: 0.75rem;
}

th.asc .sort-icon::after {
    content: '↑';
    opacity: 1;
    color: var(--accent);
}

th.desc .sort-icon::after {
    content: '↓';
    opacity: 1;
    color: var(--accent);
}

/* Popup Chart */
.chart-popup {
    display: none;
    position: fixed;
    /* top and left will be set by JavaScript */
    width: 600px;
    height: 400px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
    z-index: 100;
    padding: 1.5rem;
    animation: fadeIn 0.2s ease-out;
    pointer-events: none;
}

.chart-popup.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.popup-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1rem;
}

#popup-title {
    font-size: 1.5rem;
    font-weight: 700;
}

#popup-price {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent);
}

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