/* Ultron Trading System - Dark Theme */
:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a1f2e;
    --bg-card-hover: #222838;
    --bg-input: #0d1117;
    --border: #2d3748;
    --border-light: #374151;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-green: #10b981;
    --accent-green-bright: #34d399;
    --accent-red: #ef4444;
    --accent-red-bright: #f87171;
    --accent-blue: #3b82f6;
    --accent-blue-bright: #60a5fa;
    --accent-gold: #f59e0b;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
}

/* Sidebar */
.sidebar {
    width: 240px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.sidebar-logo {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-logo .logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent-gold), #f97316);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 800;
    color: #000;
}

.sidebar-logo h1 {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-gold), #f97316);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
}

.nav-section {
    margin-bottom: 24px;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 0 12px 8px;
    letter-spacing: 0.5px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.15s;
    font-size: 14px;
    font-weight: 500;
}

.nav-item:hover { background: var(--bg-card); color: var(--text-primary); }
.nav-item.active { background: var(--accent-blue); color: #fff; }
.nav-item .icon { font-size: 18px; width: 22px; text-align: center; }

/* Mode Badge */
.mode-badge {
    margin: 12px;
    padding: 10px;
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 700;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.mode-badge.paper { background: rgba(59, 130, 246, 0.15); color: var(--accent-blue-bright); border: 1px solid rgba(59, 130, 246, 0.3); }
.mode-badge.live { background: rgba(239, 68, 68, 0.15); color: var(--accent-red-bright); border: 1px solid rgba(239, 68, 68, 0.3); animation: pulse-live 2s infinite; }

@keyframes pulse-live {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Main Content */
.main-content {
    margin-left: 240px;
    flex: 1;
    padding: 24px;
    min-height: 100vh;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-header h2 {
    font-size: 24px;
    font-weight: 700;
}

/* Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: all 0.2s;
}

.stat-card:hover { border-color: var(--border-light); background: var(--bg-card-hover); }

.stat-card .label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.stat-card .value {
    font-size: 24px;
    font-weight: 700;
}

.stat-card .sub {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.positive { color: var(--accent-green-bright); }
.negative { color: var(--accent-red-bright); }
.neutral { color: var(--text-secondary); }

/* Tables */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 24px;
    overflow: hidden;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.card-body { padding: 0; }
.card-body.padded { padding: 20px; }

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

th {
    text-align: left;
    padding: 12px 16px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
    background: rgba(0,0,0,0.2);
}

td {
    padding: 12px 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
}

tr:last-child td { border-bottom: none; }
tr:hover { background: var(--bg-card-hover); }

/* Buttons */
.btn {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: none;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary { background: var(--accent-blue); color: #fff; }
.btn-primary:hover { background: var(--accent-blue-bright); }
.btn-success { background: var(--accent-green); color: #fff; }
.btn-success:hover { background: var(--accent-green-bright); }
.btn-danger { background: var(--accent-red); color: #fff; }
.btn-danger:hover { background: var(--accent-red-bright); }
.btn-ghost { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--bg-card); color: var(--text-primary); }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 15px; }

/* Toggle switch */
.toggle {
    position: relative;
    width: 44px;
    height: 24px;
    display: inline-block;
}

.toggle input { display: none; }

.toggle .slider {
    position: absolute;
    inset: 0;
    background: var(--border);
    border-radius: 24px;
    cursor: pointer;
    transition: 0.2s;
}

.toggle .slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    left: 3px;
    top: 3px;
    background: white;
    border-radius: 50%;
    transition: 0.2s;
}

.toggle input:checked + .slider { background: var(--accent-green); }
.toggle input:checked + .slider::before { transform: translateX(20px); }

/* Forms */
input[type="text"], input[type="number"], input[type="password"], select, textarea {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: 10px 14px;
    font-size: 14px;
    width: 100%;
    transition: border-color 0.15s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
}

label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group { margin-bottom: 16px; }

/* Strategy Cards */
.strategy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

.strategy-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: all 0.2s;
}

.strategy-card:hover { border-color: var(--accent-blue); }
.strategy-card.enabled { border-color: var(--accent-green); }

.strategy-card .header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.strategy-card .name {
    font-size: 16px;
    font-weight: 700;
}

.strategy-card .desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.5;
}

.strategy-card .pairs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.pair-tag {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue-bright);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    display: none;
}

.modal-overlay.active { display: flex; }

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    padding: 24px;
}

.modal h3 { margin-bottom: 20px; }

/* Toast */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 14px;
    box-shadow: var(--shadow);
    animation: slideIn 0.3s ease;
    max-width: 360px;
}

.toast.success { border-left: 3px solid var(--accent-green); }
.toast.error { border-left: 3px solid var(--accent-red); }
.toast.info { border-left: 3px solid var(--accent-blue); }

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

/* Chart container */
.chart-container {
    width: 100%;
    height: 300px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar { width: 60px; }
    .sidebar .nav-item span, .sidebar-logo h1, .nav-section-title { display: none; }
    .main-content { margin-left: 60px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .strategy-grid { grid-template-columns: 1fr; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* Loading */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    color: var(--text-muted);
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 12px;
}

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

/* Engine status dot */
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 6px;
}

.status-dot.running { background: var(--accent-green); box-shadow: 0 0 6px var(--accent-green); }
.status-dot.stopped { background: var(--accent-red); }

/* Backtest results */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
}

.result-item {
    text-align: center;
    padding: 16px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
}

.result-item .val {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
}

.result-item .lbl {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}

.tab {
    padding: 12px 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: all 0.15s;
}

.tab:hover { color: var(--text-primary); }
.tab.active { color: var(--accent-blue); border-bottom-color: var(--accent-blue); }

/* Two-column layout */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

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