:root {
  --bg: #0f1115;
  --panel: #181b22;
  --border: #262b35;
  --text: #e6e8eb;
  --muted: #8b93a1;
  --accent: #4c8bf5;
  --green: #2ecc71;
  --red: #e74c3c;
  --atm: #2a2f3a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.4;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.fast-toggle {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
}

.fast-toggle:hover {
  color: var(--text);
  border-color: var(--accent);
}

.fast-toggle.active {
  background: rgba(241, 196, 15, 0.15);
  border-color: #f1c40f;
  color: #f1c40f;
}

.ist-clock {
  font-size: 0.8rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  white-space: nowrap;
}

.market-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: var(--border);
  color: var(--muted);
  white-space: nowrap;
}

.market-badge.open {
  background: rgba(46, 204, 113, 0.15);
  color: var(--green);
}

.market-badge.closed {
  background: rgba(231, 76, 60, 0.15);
  color: var(--red);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.stat-value {
  font-size: 1.15rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.stat-value.muted-value {
  color: var(--muted);
}

.stat-sub {
  font-size: 0.68rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

thead th {
  background: var(--panel);
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.5rem 0.75rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
}

.group-row th {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text);
}

tbody td {
  padding: 0.5rem 0.75rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

/* Faint zebra striping so each row's values are easy to follow across. Striped
   on the ROW so per-cell backgrounds (PCR shades) always paint on top; the ATM
   row keeps its own highlight via a more specific rule below. */
tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.025);
}

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

.strike-col {
  text-align: center !important;
  font-weight: 600;
  color: var(--accent);
  background: rgba(76, 139, 245, 0.05);
}

tbody tr.atm-row {
  background: var(--atm);
}

.atm-row .strike-col {
  color: var(--text);
  background: rgba(76, 139, 245, 0.2);
}

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

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

/* Green = PUT, Red = CALL — the single colour convention used everywhere. */
.put-side {
  color: var(--green);
}

.call-side {
  color: var(--red);
}

/* CALL / PUT group headers tinted to match the column colours. */
.call-head {
  color: var(--red) !important;
}

.put-head {
  color: var(--green) !important;
}

/* Per-strike PCR columns: visually set apart from the chain (lighter text,
   narrower, with a divider line) so they read as a small add-on, not part of
   the core OI grid. The cell BACKGROUND carries the colour on a 4-step ramp. */
.pcr-head,
.pcr-col {
  color: var(--muted) !important;
  font-weight: 500;
  font-size: 0.68rem;
}

.pcr-col,
.pcr-cell {
  width: 1%;
  white-space: nowrap;
  padding-left: 0.4rem !important;
  padding-right: 0.4rem !important;
}

.pcr-cell {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
}

/* A faint divider line separating the PCR add-on from the chain proper. */
.pcr-divider {
  border-left: 2px solid var(--border);
}

/* 4-step PCR shade ramp. Light = mild skew, dark = strong skew.
   Green = put-heavy (support), red = call-heavy (resistance). */
.pcr-green-light {
  background: rgba(46, 204, 113, 0.16);
  color: var(--text);
}

.pcr-green-dark {
  background: rgba(46, 204, 113, 0.42);
  color: #eafff2;
}

.pcr-red-light {
  background: rgba(231, 76, 60, 0.16);
  color: var(--text);
}

.pcr-red-dark {
  background: rgba(231, 76, 60, 0.42);
  color: #ffecea;
}

.pcr-na {
  color: var(--muted);
}

/* Explanatory help box under the chain. */
.help-box {
  margin-top: 1rem;
  padding: 0.9rem 1.1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.55;
}

.help-box p {
  margin: 0 0 0.5rem;
}

.help-box ul {
  margin: 0 0 0.5rem;
  padding-left: 1.1rem;
}

.help-box li {
  margin-bottom: 0.35rem;
}

.help-box b {
  color: var(--text);
}

.help-tip {
  margin-bottom: 0 !important;
  font-style: italic;
}

.legend-put {
  color: var(--green);
  font-weight: 600;
}

.legend-call {
  color: var(--red);
  font-weight: 600;
}

.empty {
  text-align: center !important;
  color: var(--muted);
  padding: 1.5rem !important;
}

.footnote {
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
}

/* --- intraday trend section --------------------------------------------- */

.trend-section {
  margin-top: 2rem;
}

.trend-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.trend-header h2 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
}

.trend-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.trend-controls button {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
}

.trend-controls button:hover {
  color: var(--text);
  border-color: var(--accent);
}

.trend-controls button.active {
  background: rgba(76, 139, 245, 0.18);
  color: var(--text);
  border-color: var(--accent);
}

.trend-hint {
  font-size: 0.74rem;
  color: var(--muted);
  margin: 0 0 0.75rem;
  line-height: 1.5;
}

.trend-wrap {
  overflow-x: auto;
}

.trend-table {
  font-size: 0.8rem;
  border-collapse: separate;
  border-spacing: 0;
}

.trend-table th,
.trend-table td {
  padding: 0.35rem 0.55rem;
  text-align: right;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

.trend-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
}

/* Freeze the strike column so it stays visible while scrolling time. */
.trend-corner,
.trend-strike {
  position: sticky;
  left: 0;
  z-index: 2;
  text-align: left !important;
  font-weight: 600;
  background: var(--panel);
  color: var(--accent);
}

.trend-corner {
  z-index: 3;
  color: var(--muted);
}

.trend-cell {
  font-variant-numeric: tabular-nums;
}

.trend-cell.empty-cell {
  color: var(--border);
}

.trend-cell.atm-cell {
  background: rgba(76, 139, 245, 0.08);
}

.trend-pcr-row .trend-cell {
  color: var(--text);
}

.trend-pcr-row td {
  border-top: 2px solid var(--border);
  font-weight: 600;
}

/* --- last-30-min tape --------------------------------------------------- */

.tape-table {
  font-size: 0.85rem;
}

.tape-table th {
  text-align: right;
}

.tape-table td {
  padding: 0.45rem 0.75rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}

.tape-table tbody tr:first-child {
  background: rgba(76, 139, 245, 0.06);
}

.tape-table .empty-cell {
  color: var(--muted);
}

/* Per-strike "calls / puts added" header sublabel. */
.tape-table th .th-sub {
  display: block;
  font-size: 0.62rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: none;
  letter-spacing: 0;
}

/* Flow cell: strike label on top, "calls / puts" added below; faint tint by
   which side built faster. */
.tape-flow.positive {
  background: rgba(46, 204, 113, 0.1);
}

.tape-flow.negative {
  background: rgba(231, 76, 60, 0.1);
}

.tape-flow .flow-strike {
  display: block;
  font-size: 0.68rem;
  color: var(--muted);
  font-weight: 600;
}

.tape-flow .flow-vals {
  display: block;
}

.tape-flow .flow-call {
  color: var(--red);
}

.tape-flow .flow-put {
  color: var(--green);
}

.tape-flow .flow-sep {
  color: var(--muted);
}

.tape-flow.atm-cell {
  outline: 1px solid rgba(76, 139, 245, 0.35);
  outline-offset: -1px;
}

.tape-flow.atm-cell .flow-strike {
  color: var(--accent);
}

/* ATM column: bold, and emphasised on the rows where it stepped (trend). */
.tape-atm {
  font-weight: 600;
}

.tape-atm.atm-moved {
  font-weight: 700;
}

.tape-atm.atm-moved.positive {
  background: rgba(46, 204, 113, 0.14);
}

.tape-atm.atm-moved.negative {
  background: rgba(231, 76, 60, 0.14);
}

/* Near-the-money PCR columns: the value sits above its step-over-step move. */
.tape-pcr {
  text-align: center;
  white-space: nowrap;
}

.tape-pcr-val {
  font-weight: 600;
}

.tape-pcr-move {
  display: block;
  font-size: 0.72em;
  opacity: 0.85;
}

.tape-pcr-move.positive {
  color: #1e7e45;
}

.tape-pcr-move.negative {
  color: #b03124;
}

@media (max-width: 480px) {
  .topbar h1 {
    font-size: 0.95rem;
  }
  .container {
    padding: 1rem;
  }
}