/* ============================================================
 * US Quant Site — Design System
 * Dark quantitative-trading dashboard vibe.
 * Tailwind is loaded via CDN at runtime; this CSS provides custom
 * tokens, layout primitives, and small custom components.
 * ============================================================ */

:root {
    --bg-canvas:    #0a0e17;
    --bg-panel:     #111827;
    --bg-panel-2:   #1f2937;
    --bg-elevated:  #243043;
    --line:         #2a3548;
    --line-soft:    #1d2738;
    --text-primary: #e6ecf5;
    --text-secondary:#9ca8be;
    --text-muted:   #6b7588;
    --accent:       #3b82f6;
    --accent-2:     #6366f1;
    --green:        #10b981;
    --green-bg:     rgba(16, 185, 129, .15);
    --red:          #ef4444;
    --red-bg:       rgba(239, 68, 68, .15);
    --amber:        #f59e0b;
    --amber-bg:     rgba(245, 158, 11, .15);
    --cyan:         #06b6d4;
    --violet:       #8b5cf6;
}

* { box-sizing: border-box; }
html, body { background: var(--bg-canvas); color: var(--text-primary); }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif; line-height: 1.55; -webkit-font-smoothing: antialiased; }

a { color: inherit; text-decoration: none; }

/* Card */
.q-card {
    background: var(--bg-panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 18px 20px;
    position: relative;
    transition: border-color .15s ease;
}
.q-card:hover { border-color: var(--line-elevated, #3a465c); }
.q-card .q-card-title { color: var(--text-secondary); font-size: 12px; letter-spacing: .04em; text-transform: uppercase; margin-bottom: 10px; }
.q-card .q-card-value { color: var(--text-primary); font-size: 28px; font-weight: 600; font-variant-numeric: tabular-nums; }
.q-card .q-card-sub { color: var(--text-muted); font-size: 12px; margin-top: 4px; }

/* Pills */
.q-pill { display: inline-flex; align-items: center; gap: 4px; padding: 2px 10px; border-radius: 999px; font-size: 11px; font-weight: 600; line-height: 18px; }
.q-pill.green   { background: var(--green-bg); color: var(--green); }
.q-pill.red     { background: var(--red-bg);   color: var(--red); }
.q-pill.amber   { background: var(--amber-bg); color: var(--amber); }
.q-pill.blue    { background: rgba(59,130,246,.15); color: #60a5fa; }
.q-pill.violet  { background: rgba(139,92,246,.15); color: #a78bfa; }
.q-pill.gray    { background: rgba(156,163,175,.15); color: #cbd5e1; }

/* Tab bar */
.q-tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.q-tab {
    padding: 8px 14px; border-radius: 8px; font-size: 13px; font-weight: 500;
    background: var(--bg-panel); color: var(--text-secondary);
    cursor: pointer; border: 1px solid var(--line); transition: all .15s;
}
.q-tab:hover { color: var(--text-primary); border-color: var(--accent); }
.q-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Signal light */
.q-signal { display: inline-flex; align-items: center; gap: 6px; }
.q-signal::before {
    content: ''; width: 8px; height: 8px; border-radius: 999px;
    box-shadow: 0 0 8px currentColor;
}
.q-signal.green  { color: var(--green); }
.q-signal.green::before  { background: var(--green); }
.q-signal.red    { color: var(--red); }
.q-signal.red::before    { background: var(--red); }
.q-signal.amber  { color: var(--amber); }
.q-signal.amber::before  { background: var(--amber); }
.q-signal.gray   { color: var(--text-muted); }
.q-signal.gray::before   { background: var(--text-muted); }

/* Tables */
.q-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.q-table thead th { color: var(--text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: .05em; font-size: 11px; padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--line); }
.q-table tbody td { padding: 10px; border-bottom: 1px solid var(--line-soft); color: var(--text-primary); font-variant-numeric: tabular-nums; }
.q-table tbody tr:hover { background: rgba(99,102,241,.05); }
.q-table tbody tr:last-child td { border-bottom: none; }

/* Stat block */
.q-stat { display: flex; flex-direction: column; gap: 4px; }
.q-stat .label { font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-muted); }
.q-stat .value { font-size: 18px; font-weight: 600; font-variant-numeric: tabular-nums; }

/* Header / nav */
.q-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 24px; border-bottom: 1px solid var(--line);
    background: var(--bg-panel); position: sticky; top: 0; z-index: 50;
    backdrop-filter: blur(8px);
}
.q-logo { font-weight: 700; font-size: 18px; color: var(--text-primary); display: inline-flex; align-items: center; gap: 8px; }
.q-logo .badge { background: var(--accent); color: #fff; font-size: 10px; padding: 2px 6px; border-radius: 4px; letter-spacing: .05em; }
.q-nav { display: flex; gap: 4px; align-items: center; }
.q-nav a {
    color: var(--text-secondary); padding: 8px 14px; border-radius: 8px; font-size: 14px; font-weight: 500;
    transition: all .15s;
}
.q-nav a:hover { color: var(--text-primary); background: var(--bg-panel-2); }
.q-nav a.active { color: var(--text-primary); background: var(--bg-panel-2); border: 1px solid var(--accent); }

/* Main container */
main { padding: 24px; max-width: 1440px; margin: 0 auto; }

/* Footer */
.q-footer { padding: 30px 24px; color: var(--text-muted); font-size: 12px; text-align: center; border-top: 1px solid var(--line); margin-top: 40px; }

/* Number formatting */
.q-num { font-variant-numeric: tabular-nums; }
.q-pos { color: var(--green); }
.q-neg { color: var(--red); }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--bg-elevated); border-radius: 4px; }
::-webkit-scrollbar-track { background: transparent; }

/* ECharts darkmode tweaks */
.echarts-for-leader { background: transparent !important; }

/* Strategy card list */
.q-strategy-card {
    background: var(--bg-panel); border: 1px solid var(--line); border-radius: 12px;
    padding: 18px; transition: all .2s; cursor: pointer;
}
.q-strategy-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.q-strategy-card .name { font-size: 16px; font-weight: 600; color: var(--text-primary); margin-bottom: 4px; }
.q-strategy-card .meta { font-size: 12px; color: var(--text-muted); margin-bottom: 10px; }
.q-strategy-card .desc { color: var(--text-secondary); font-size: 13px; line-height: 1.6; }
.q-strategy-card .stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }

/* Loader */
.q-loader { display: inline-block; width: 32px; height: 32px; border: 3px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Section heading */
.q-section-h { margin: 24px 0 14px; display: flex; align-items: center; gap: 10px; }
.q-section-h h2 { font-size: 18px; font-weight: 600; color: var(--text-primary); }
.q-section-h .line { flex: 1; height: 1px; background: var(--line); }

/* Modal */
.q-modal { position: fixed; inset: 0; background: rgba(0,0,0,.6); z-index: 100; display: none; align-items: center; justify-content: center; backdrop-filter: blur(4px); }
.q-modal.open { display: flex; }
.q-modal-body { background: var(--bg-panel); border-radius: 14px; padding: 24px; max-width: 900px; width: 90%; max-height: 85vh; overflow-y: auto; border: 1px solid var(--line); }

/* Form */
.q-input, .q-select {
    background: var(--bg-canvas); color: var(--text-primary); border: 1px solid var(--line);
    border-radius: 6px; padding: 8px 12px; font-size: 13px; width: 100%;
}
.q-input:focus, .q-select:focus { outline: none; border-color: var(--accent); }
.q-label { font-size: 12px; color: var(--text-secondary); margin-bottom: 6px; display: block; }
.q-btn { background: var(--accent); color: #fff; padding: 9px 18px; border-radius: 8px; font-size: 13px; font-weight: 600; border: none; cursor: pointer; transition: opacity .15s; }
.q-btn:hover { opacity: .9; }
.q-btn.secondary { background: var(--bg-panel-2); border: 1px solid var(--line); color: var(--text-primary); }

/* Responsive */
@media (max-width: 768px) {
    .q-header { flex-direction: column; align-items: flex-start; gap: 12px; }
    .q-nav { width: 100%; overflow-x: auto; }
    main { padding: 16px; }
}