/* ═══════════════════════════════════════════════════════════════════════════
   Phivote - /backtest page. Builds on theme.css.
   Viz: stat tiles + a single-hue equity line (hairline zero axis, endpoint
   marker with surface ring + direct label). Values wear text tokens.
   ═══════════════════════════════════════════════════════════════════════════ */

.bt-wrap { padding: 42px 0 70px; }
.bt-head { max-width: 720px; margin-bottom: 30px; }
.bt-eyebrow { display: inline-block; font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin-bottom: 12px; }
.bt-head h1 { font-size: clamp(30px, 4.5vw, 44px); letter-spacing: -0.03em; line-height: 1.06; margin-bottom: 14px; }
.bt-head p { color: var(--txt-2); font-size: 15px; line-height: 1.7; }
.bt-head em { font-style: italic; color: var(--accent); }

/* Controls */
.bt-controls { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; margin-bottom: 10px; }
.bt-controls label { display: flex; flex-direction: column; gap: 6px; font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--txt-3); }
.bt-controls #btSymbols { min-width: 340px; font-family: var(--font-mono); font-size: 12.5px; }
.bt-status { font-size: 12px; color: var(--txt-3); min-height: 18px; margin-bottom: 24px; }

/* KPI tiles */
.bt-tiles { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin-bottom: 16px; }
.bt-tile { display: flex; flex-direction: column; gap: 4px; padding: 14px 16px; background: var(--bg-panel); border: 1px solid var(--line); border-radius: var(--r); }
.bt-tile .l { font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--txt-3); }
.bt-tile .v { font-size: 26px; font-weight: 700; letter-spacing: -0.02em; color: var(--txt); }
.bt-tile .s { font-size: 11px; color: var(--txt-3); }

/* Cards */
.bt-grid { display: grid; grid-template-columns: 7fr 5fr; gap: 14px; margin-bottom: 14px; align-items: stretch; }
.bt-card { background: var(--bg-panel); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 20px; margin-bottom: 14px; }
.bt-grid .bt-card { margin-bottom: 0; }
.bt-card h2 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.09em; color: var(--txt-3); font-weight: 700; margin-bottom: 14px; }
.bt-note { text-transform: none; letter-spacing: 0; font-weight: 500; color: var(--txt-4); margin-inline-start: 6px; }

.bt-eq { height: 220px; }
.bt-eq canvas { width: 100%; height: 100%; display: block; }

/* Tables */
.bt-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.bt-table th { text-align: start; font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--txt-3); padding: 6px 10px; border-bottom: 1px solid var(--line); }
.bt-table td { padding: 8px 10px; border-bottom: 1px solid var(--line); color: var(--txt-2); }
.bt-table tr:last-child td { border-bottom: 0; }
.bt-table .up { color: var(--long); }
.bt-table .down { color: var(--short); }
.bt-band-note { font-size: 12px; color: var(--txt-3); margin-top: 10px; line-height: 1.6; }
.bt-scroll { overflow-x: auto; }
.bt-side { font-family: var(--font-mono); font-size: 10.5px; font-weight: 700; padding: 2px 8px; border-radius: 999px; }
.bt-side.long { color: var(--long); background: var(--long-dim); }
.bt-side.short { color: var(--short); background: var(--short-dim); }
.bt-out { font-family: var(--font-mono); font-size: 11px; }
.bt-out.win { color: var(--long); }
.bt-out.loss { color: var(--short); }
.bt-out.expired, .bt-out.open { color: var(--txt-3); }

/* Methodology + error */
.bt-method { border: 1px dashed var(--line-mid); border-radius: var(--r-lg); padding: 18px 20px; }
.bt-method h3 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.09em; color: var(--txt-3); margin-bottom: 10px; }
.bt-method p { font-size: 12.5px; color: var(--txt-2); line-height: 1.7; }
.bt-caveat { margin-top: 10px; color: var(--txt-3) !important; }
.bt-error { border: 1px solid rgba(255, 77, 109, 0.35); background: var(--short-dim); border-radius: var(--r-lg); padding: 22px 24px; max-width: 640px; }
.bt-error h2 { font-size: 17px; margin-bottom: 8px; }
.bt-error p { font-size: 13.5px; color: var(--txt-2); line-height: 1.65; }
.hide { display: none !important; }

.bt-foot { border-top: 1px solid var(--line); padding: 18px 0 34px; }
.bt-foot .container { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 12.5px; color: var(--txt-3); }
.bt-foot a { color: var(--txt-2); }

@media (max-width: 900px) {
  .bt-tiles { grid-template-columns: repeat(2, 1fr); }
  .bt-grid { grid-template-columns: 1fr; }
  .bt-controls #btSymbols { min-width: 0; width: 100%; }
  .bt-controls label:first-child { width: 100%; }
}