/* ===== Theme tokens ===== */
:root {
  color-scheme: dark;
  --bg: #0e1116;
  --surface: #131720;
  --surface-2: #1b2230;
  --border: #222833;
  --border-2: #2c3648;
  --text: #d6dae0;
  --muted: #8b95a3;
  --faint: #6b7482;
  --accent: #4fc3f7;
  --up: #4ade80;
  --down: #f87171;
  --warn: #f0a13b;
  --ltp: #e6b95c;
  --grid: #1a2029;
  --row-border: #171c24;
  --atm-bg: #1c2740;
  --strike-bg: #10141b;
  --ce-grp-bg: #0f1a13;
  --pe-grp-bg: #1a0f0f;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --pill-ok-bg: #10331f; --pill-ok-fg: #4ade80; --pill-ok-bd: #1d6b3a;
  --pill-bad-bg: #3a1414; --pill-bad-fg: #f87171; --pill-bad-bd: #7f1d1d;
  --pill-unk-bg: #2a2f39; --pill-unk-fg: #9aa4b2;
  --numtint: #c2c9d4;
  --bar-op: .30;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-2: #f1f3f5;
  --border: #e2e6ea;
  --border-2: #cbd2da;
  --text: #1a1f26;
  --muted: #667085;
  --faint: #98a2b3;
  --accent: #0284c7;
  --up: #16a34a;
  --down: #dc2626;
  --warn: #b45309;
  --ltp: #b45309;
  --grid: #eef1f4;
  --row-border: #eaedf1;
  --atm-bg: #dbeafe;
  --strike-bg: #f3f5f8;
  --ce-grp-bg: #e7f6ec;
  --pe-grp-bg: #fdeaea;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --pill-ok-bg: #dcfce7; --pill-ok-fg: #15803d; --pill-ok-bd: #86efac;
  --pill-bad-bg: #fee2e2; --pill-bad-fg: #b91c1c; --pill-bad-bd: #fca5a5;
  --pill-unk-bg: #e5e8ec; --pill-unk-fg: #667085;
  --numtint: #475467;
  --bar-op: .22;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 14px/1.4 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
header { padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--surface); }
header h1 { margin: 0; font-size: 18px; color: var(--accent); }
.titlebar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.authbar { display: flex; gap: 8px; align-items: center; }
.pill { font-size: 12px; padding: 4px 10px; border-radius: 999px; border: 1px solid transparent; }
.pill-ok { background: var(--pill-ok-bg); color: var(--pill-ok-fg); border-color: var(--pill-ok-bd); }
.pill-bad { background: var(--pill-bad-bg); color: var(--pill-bad-fg); border-color: var(--pill-bad-bd); }
.pill-unknown { background: var(--pill-unk-bg); color: var(--pill-unk-fg); }
#authbtn { padding: 6px 12px; }
.controls { display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: flex-end; }
label { display: flex; flex-direction: column; gap: 3px; font-size: 11px; color: var(--muted); }
select, input, button {
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border-2); border-radius: 6px;
  padding: 6px 8px; font-size: 13px;
}
button { background: var(--primary); border-color: var(--primary); color: #fff; cursor: pointer; padding: 7px 16px; align-self: flex-end; }
button:hover { background: var(--primary-hover); }
#opt-controls { display: contents; }
#status { font-size: 12px; color: var(--warn); align-self: flex-end; }
main { padding: 12px 16px; }
#chart { width: 100%; height: calc(100vh - 130px); min-height: 420px; }

/* theme toggle */
.theme-toggle { background: var(--surface-2); color: var(--text); border: 1px solid var(--border-2); padding: 6px 10px; align-self: center; }
.theme-toggle:hover { background: var(--border-2); }

/* --- Option chain page --- */
.navlink { font-size: 12px; color: var(--muted); text-decoration: none; margin-left: 10px; }
.navlink:hover { color: var(--accent); }
.mono { font-variant-numeric: tabular-nums; font-family: ui-monospace, Menlo, Consolas, monospace; }
.replay { display: flex; gap: 6px; align-items: flex-end; flex-wrap: wrap; }
.replay button { padding: 6px 10px; background: var(--surface-2); border-color: var(--border-2); color: var(--text); }
.replay button:hover { background: var(--border-2); }
#btnPlay { background: #16a34a; border-color: #16a34a; color: #fff; }
#btnPlay:hover { background: #15803d; }
.scrubber { display: flex; gap: 12px; align-items: center; margin-top: 8px; }
#slider { flex: 1; accent-color: var(--accent); }
#spotbox { color: var(--accent); }
#scrubtime { color: var(--warn); min-width: 44px; }

table.chain { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
table.chain th, table.chain td { padding: 3px 8px; text-align: right; font-size: 12.5px; border-bottom: 1px solid var(--row-border); }
table.chain thead .grp th { text-align: center; padding: 6px; font-size: 12px; letter-spacing: .06em; }
table.chain .grp .ce { color: var(--up); background: var(--ce-grp-bg); }
table.chain .grp .pe { color: var(--down); background: var(--pe-grp-bg); }
table.chain .cols th { color: var(--muted); font-weight: 600; position: sticky; top: 0; background: var(--surface); }
.strikehdr, td.strike { text-align: center; font-weight: 700; color: var(--text); background: var(--strike-bg); }
tr.atm { background: var(--atm-bg); }
tr.atm td.strike { color: var(--accent); }
td.ltp { color: var(--ltp); }
td.up { color: var(--up); }
td.down { color: var(--down); }
.oicell { position: relative; }
.oicell.itm { background: color-mix(in srgb, var(--accent) 8%, transparent); }
.oicell .bar { position: absolute; top: 2px; bottom: 2px; opacity: .18; z-index: 0; }
.oicell .bar.ce { right: 0; background: var(--up); }
.oicell .bar.pe { left: 0; background: var(--down); }
.oicell .oival { position: relative; z-index: 1; }

/* --- Login page --- */
.login-wrap { display: flex; min-height: 90vh; align-items: center; justify-content: center; }
.login-card { text-align: center; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 36px 40px; max-width: 360px; }
.login-card h1 { color: var(--accent); margin: 0 0 4px; }
.login-card .sub { color: var(--muted); margin: 0 0 20px; }
.login-card .pill { display: inline-block; margin-bottom: 18px; }
.login-card button { width: 100%; background: #ff6a00; border-color: #ff6a00; padding: 11px; font-size: 15px; }
.login-card button:hover { background: #e65f00; }
.login-card .hint { color: var(--faint); font-size: 11px; margin: 16px 0 0; }

/* --- Stats page --- */
.sec { color: var(--muted); font-weight: 600; font-size: 13px; margin: 18px 0 8px; }
table.stats td, table.stats th { text-align: right; }
table.stats .l { text-align: left; }
table.stats tr.clickable { cursor: pointer; }
table.stats tr.clickable:hover { background: var(--grid); }

/* --- Login form fields --- */
.login-card input { width: 100%; margin-bottom: 12px; padding: 11px; font-size: 15px; }
.login-card button[type=submit] { background: var(--primary); border-color: var(--primary); }
.login-card button[type=submit]:hover { background: var(--primary-hover); }
.loginmsg { color: var(--down); font-size: 12px; min-height: 16px; margin-top: 10px; }

/* --- Live toggle --- */
.livechk { flex-direction: row; align-items: center; gap: 5px; color: var(--up); font-size: 13px; align-self: flex-end; padding-bottom: 6px; }
.livechk input { width: auto; }

/* --- Dashboard --- */
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 18px; }
.kpi { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.kpi-label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.kpi-val { font-size: 22px; font-weight: 700; margin: 4px 0 2px; font-variant-numeric: tabular-nums; }
.kpi-sub { font-size: 11px; color: var(--faint); }
.kpi.good .kpi-val { color: var(--up); }
.kpi.bad .kpi-val { color: var(--down); }

.dash-cols { display: grid; grid-template-columns: 1fr 280px; gap: 16px; align-items: start; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 8px 14px 14px; }
.panel .sec { margin-top: 12px; }
.panel.narrow .levels { margin-bottom: 6px; }
.level { display: flex; justify-content: space-between; padding: 5px 8px; border-bottom: 1px solid var(--grid); font-variant-numeric: tabular-nums; }
.lvl-strike { font-weight: 700; }
.lvl-oi.ce { color: var(--up); }
.lvl-oi.pe { color: var(--down); }

.profile { display: flex; flex-direction: column; gap: 1px; }
.prow { display: grid; grid-template-columns: 1fr 70px 1fr; align-items: center; font-size: 11.5px; font-variant-numeric: tabular-nums; }
.prow.atm { background: var(--atm-bg); border-radius: 4px; }
.prow.atm .pstrike { color: var(--accent); }
.pstrike { text-align: center; font-weight: 700; }
.pe-side { position: relative; display: flex; justify-content: flex-end; align-items: center; padding-right: 6px; height: 18px; }
.ce-side { position: relative; display: flex; justify-content: flex-start; align-items: center; padding-left: 6px; height: 18px; }
.pe-bar { position: absolute; right: 0; top: 2px; bottom: 2px; background: var(--down); opacity: var(--bar-op); border-radius: 2px 0 0 2px; }
.ce-bar { position: absolute; left: 0; top: 2px; bottom: 2px; background: var(--up); opacity: var(--bar-op); border-radius: 0 2px 2px 0; }
.pe-num, .ce-num { position: relative; z-index: 1; color: var(--numtint); }
@media (max-width: 760px) { .dash-cols { grid-template-columns: 1fr; } }