/* Trading School - one stylesheet, no framework, phone first. */

:root {
  --ink: #16202e;
  --ink-soft: #46586f;
  --ink-dim: #6b7c92;
  --paper: #fbfaf7;
  --card: #ffffff;
  --rule: #e4e2dc;
  --rule-soft: #eeece7;
  --navy: #14243d;
  --gold: #a9781f;
  --gold-soft: #f4ecd9;
  --up: #0f8a5f;
  --down: #c23b32;
  --accent: #2f5fb3;
  --shadow: 0 1px 2px rgba(20,36,61,.06), 0 8px 24px rgba(20,36,61,.06);
  --radius: 12px;
  --maxw: 760px;

  --chart-bg: #ffffff;
  --chart-grid: #ecebe6;
  --chart-axis: #8b93a1;
  --chart-text: #16202e;
  --chart-up: #0f8a5f;
  --chart-down: #c23b32;
  --chart-up-fill: rgba(15,138,95,.5);
  --chart-down-fill: rgba(194,59,50,.5);
  --chart-line: #14243d;
  --chart-cross: #9aa3b0;
  --chart-zone: rgba(47,95,179,.08);
}

html[data-theme="dark"] {
  --ink: #e8e9ec;
  --ink-soft: #b3bcc9;
  --ink-dim: #8e99a8;
  --paper: #0f141c;
  --card: #161d28;
  --rule: #26303e;
  --rule-soft: #1d2531;
  --navy: #cfd8e6;
  --gold: #d6a751;
  --gold-soft: #2a2416;
  --accent: #7aa5f0;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);

  --chart-bg: #161d28;
  --chart-grid: #232d3b;
  --chart-axis: #7d8798;
  --chart-text: #e8e9ec;
  --chart-up: #35b483;
  --chart-down: #e2645a;
  --chart-up-fill: rgba(53,180,131,.45);
  --chart-down-fill: rgba(226,100,90,.45);
  --chart-line: #9fc0ff;
  --chart-cross: #6b7686;
  --chart-zone: rgba(122,165,240,.10);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.62 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- chrome ---- */
.top {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 12px;
  padding: 10px clamp(12px, 3vw, 22px);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.brand { display: flex; align-items: center; gap: 9px; color: var(--ink); font-weight: 650; letter-spacing: -.01em; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 19px; height: 19px; border-radius: 3px;
  background:
    linear-gradient(135deg, transparent 49%, var(--gold) 49% 56%, transparent 56%),
    linear-gradient(180deg, var(--navy), color-mix(in srgb, var(--navy) 70%, var(--accent)));
}
.top-nav { display: flex; gap: 16px; margin-left: auto; font-size: 14.5px; }
.top-nav a { color: var(--ink-soft); }
.top-nav a.on { color: var(--ink); font-weight: 600; }
.menu-btn, .theme-btn {
  border: 1px solid var(--rule); background: var(--card); color: var(--ink-soft);
  border-radius: 8px; width: 34px; height: 32px; font-size: 15px; cursor: pointer; flex: none;
}
.menu-btn { display: none; }
.theme-btn { margin-left: 8px; }

@media (max-width: 720px) {
  .top-nav { display: none; }
  .menu-btn { display: block; }
  .brand-name { font-size: 15px; }
}

.drawer { position: fixed; inset: 52px 0 0 0; z-index: 39; background: var(--paper); overflow: auto; }
.drawer-inner { padding: 14px clamp(14px, 4vw, 22px) 60px; }
.drawer a { display: block; padding: 11px 4px; border-bottom: 1px solid var(--rule-soft); color: var(--ink); font-size: 17px; }

.app { max-width: var(--maxw); margin: 0 auto; padding: 20px clamp(14px, 4vw, 22px) 60px; }
.loading { color: var(--ink-dim); padding: 40px 0; }

.foot {
  max-width: var(--maxw); margin: 0 auto; padding: 22px clamp(14px, 4vw, 22px) 44px;
  border-top: 1px solid var(--rule); color: var(--ink-dim); font-size: 13px;
}
.foot-dim { margin-top: 6px; color: var(--ink-dim); opacity: .85; }

/* ---- type ---- */
h1 { font-size: clamp(25px, 5.2vw, 33px); line-height: 1.2; letter-spacing: -.02em; margin: 0 0 6px; }
h2 { font-size: clamp(19px, 3.6vw, 22px); line-height: 1.3; letter-spacing: -.01em; margin: 30px 0 10px; }
h3 { font-size: 16.5px; margin: 22px 0 6px; }
p { margin: 0 0 14px; }
.lede { color: var(--ink-soft); font-size: 17.5px; margin-bottom: 20px; }
.eyebrow { font-size: 12px; text-transform: uppercase; letter-spacing: .09em; color: var(--gold); font-weight: 650; }
code { font: 13.5px/1.5 ui-monospace, "SF Mono", Menlo, Consolas, monospace; background: var(--rule-soft); padding: 1px 5px; border-radius: 4px; }
ul, ol { margin: 0 0 14px; padding-left: 22px; }
li { margin: 5px 0; }
strong { font-weight: 640; }

/* ---- home ---- */
.hero { padding: 6px 0 4px; }
.hero h1 { margin-bottom: 10px; }
.stat-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 26px; }
.stat {
  border: 1px solid var(--rule); border-radius: 10px; background: var(--card);
  padding: 8px 12px; font-size: 13px; color: var(--ink-soft);
}
.stat b { display: block; font-size: 18px; color: var(--ink); font-weight: 650; letter-spacing: -.01em; }

.mod-list { display: grid; gap: 10px; }
.mod {
  display: block; border: 1px solid var(--rule); border-radius: var(--radius);
  background: var(--card); padding: 14px 16px; color: inherit; box-shadow: var(--shadow);
}
.mod:hover { text-decoration: none; border-color: color-mix(in srgb, var(--accent) 40%, var(--rule)); }
.mod-top { display: flex; align-items: baseline; gap: 10px; }
.mod-n { font: 600 12px/1 ui-monospace, monospace; color: var(--gold); letter-spacing: .06em; }
.mod-title { font-weight: 650; font-size: 17px; letter-spacing: -.01em; }
.mod-blurb { color: var(--ink-soft); font-size: 14.5px; margin-top: 4px; }
.mod-meta { display: flex; gap: 12px; align-items: center; margin-top: 9px; font-size: 12.5px; color: var(--ink-dim); }
.bar { height: 4px; border-radius: 3px; background: var(--rule); flex: 1; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--up); }

/* ---- lesson ---- */
.crumb { font-size: 13px; color: var(--ink-dim); margin-bottom: 10px; }
.crumb a { color: var(--ink-dim); }
.lesson-nav { display: flex; gap: 10px; margin: 34px 0 0; padding-top: 18px; border-top: 1px solid var(--rule); }
.lesson-nav a, .btn, button.btn {
  border: 1px solid var(--rule); border-radius: 9px; background: var(--card);
  padding: 9px 14px; font: inherit; font-size: 14.5px; color: var(--ink); cursor: pointer;
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--navy); color: var(--paper); border-color: var(--navy); }
html[data-theme="dark"] .btn.primary { background: var(--accent); color: #0f141c; border-color: var(--accent); }
.btn.small { padding: 6px 10px; font-size: 13px; }
.btn[disabled] { opacity: .5; cursor: default; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.spacer { flex: 1; }

.note, .warn, .key {
  border-radius: 10px; padding: 12px 14px; margin: 16px 0; font-size: 15px;
  border: 1px solid var(--rule); background: var(--card);
}
.note b, .warn b, .key b { display: block; margin-bottom: 3px; }
.note { border-left: 3px solid var(--accent); }
.warn { border-left: 3px solid var(--down); }
.key { border-left: 3px solid var(--gold); background: var(--gold-soft); }
html[data-theme="dark"] .key { background: var(--gold-soft); }

.formula {
  border: 1px solid var(--rule); border-radius: 10px; background: var(--card);
  padding: 12px 14px; margin: 16px 0;
}
/* white-space: pre is load-bearing. Formula blocks are written as multi-line
   strings and without it every one of them collapsed into a run-on sentence. */
.formula .f { font: 13.5px/1.65 ui-monospace, Menlo, Consolas, monospace; color: var(--ink); overflow-x: auto; white-space: pre; }
.formula .plain { font-size: 14px; color: var(--ink-soft); margin-top: 7px; }
.formula .mean { font-size: 14px; color: var(--ink-soft); margin-top: 7px; border-top: 1px dashed var(--rule); padding-top: 7px; }

.tbl-wrap { overflow-x: auto; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--rule-soft); }
th { font-weight: 640; color: var(--ink-soft); font-size: 12.5px; text-transform: uppercase; letter-spacing: .05em; white-space: nowrap; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
tr:last-child td { border-bottom: none; }
.up { color: var(--up); }
.down { color: var(--down); }

.ask { border: 1px solid var(--rule); border-radius: 10px; margin: 16px 0; background: var(--card); overflow: hidden; }
.ask summary { padding: 11px 14px; cursor: pointer; font-weight: 600; font-size: 15px; list-style: none; }
.ask summary::-webkit-details-marker { display: none; }
.ask summary:before { content: "?"; display: inline-block; width: 18px; height: 18px; line-height: 18px; text-align: center; border-radius: 50%; background: var(--gold); color: #fff; font-size: 12px; margin-right: 8px; }
.ask .body { padding: 0 14px 12px; font-size: 15px; color: var(--ink-soft); }

/* ---- charts ---- */
.figure { margin: 18px 0 22px; }
.tsc { border: 1px solid var(--rule); border-radius: 10px; background: var(--chart-bg); overflow: hidden; }
.tsc-readout { padding: 7px 10px 5px; font-size: 12px; color: var(--ink-soft); border-bottom: 1px solid var(--rule-soft); line-height: 1.5; }
.tsc-readout b { color: var(--ink); font-weight: 640; }
.tsc-sep { margin: 0 7px; opacity: .4; }
.tsc-dim { color: var(--ink-dim); }
.tsc-canvas-wrap { position: relative; }
.tsc canvas { display: block; width: 100%; touch-action: pan-y; cursor: crosshair; }
.tsc canvas.tsc-grabbing { cursor: grabbing; }
.tsc-note { padding: 7px 10px; font-size: 12.5px; color: var(--down); border-top: 1px solid var(--rule-soft); }
.tsc-marknote { margin-top: 3px; color: var(--ink); }
.fig-cap { font-size: 13.5px; color: var(--ink-soft); margin-top: 8px; }
.fig-cap b { color: var(--ink); }
.chart-tools { display: flex; flex-wrap: wrap; gap: 6px; margin: 9px 0 0; }
.chip {
  border: 1px solid var(--rule); background: var(--card); color: var(--ink-soft);
  border-radius: 999px; padding: 4px 11px; font-size: 12.5px; cursor: pointer;
}
.chip.on { background: var(--navy); color: var(--paper); border-color: var(--navy); }
html[data-theme="dark"] .chip.on { background: var(--accent); color: #0f141c; border-color: var(--accent); }
select, input[type="number"], input[type="text"], input[type="date"], textarea {
  border: 1px solid var(--rule); border-radius: 8px; background: var(--card); color: var(--ink);
  padding: 7px 9px; font: inherit; font-size: 14px; max-width: 100%;
}
label.field { display: inline-flex; flex-direction: column; gap: 4px; font-size: 12.5px; color: var(--ink-soft); margin: 0 10px 10px 0; }
.field-row { display: flex; flex-wrap: wrap; align-items: flex-end; }

/* ---- quiz / cards / drills ---- */
.q-card { border: 1px solid var(--rule); border-radius: var(--radius); background: var(--card); padding: 16px; box-shadow: var(--shadow); }
.q-stem { font-size: 17px; font-weight: 600; margin-bottom: 14px; letter-spacing: -.01em; }
.opt {
  display: block; width: 100%; text-align: left; border: 1px solid var(--rule);
  border-radius: 9px; background: var(--paper); padding: 11px 13px; margin-bottom: 8px;
  font: inherit; font-size: 15px; color: var(--ink); cursor: pointer;
}
.opt:hover { border-color: var(--accent); }
.opt.right { border-color: var(--up); background: color-mix(in srgb, var(--up) 10%, var(--card)); }
.opt.wrong { border-color: var(--down); background: color-mix(in srgb, var(--down) 10%, var(--card)); }
.opt.dim { opacity: .55; }
.why { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--rule-soft); font-size: 14.5px; color: var(--ink-soft); }
.progress-line { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--ink-dim); margin-bottom: 12px; }

.card-face {
  border: 1px solid var(--rule); border-radius: var(--radius); background: var(--card);
  padding: 26px 20px; min-height: 190px; display: flex; flex-direction: column;
  justify-content: center; text-align: center; box-shadow: var(--shadow); cursor: pointer;
}
.card-q { font-size: 19px; font-weight: 600; letter-spacing: -.01em; }
.card-a { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--rule-soft); font-size: 16px; color: var(--ink-soft); text-align: left; }
.card-hint { margin-top: 14px; font-size: 12.5px; color: var(--ink-dim); }

.drill-list { display: grid; gap: 9px; }
.drill { border: 1px solid var(--rule); border-radius: 10px; background: var(--card); padding: 13px 15px; }
.drill-kind { font-size: 11.5px; text-transform: uppercase; letter-spacing: .08em; color: var(--gold); font-weight: 650; }
.verdict { margin-top: 12px; padding: 11px 13px; border-radius: 9px; font-size: 14.5px; }
.verdict.good { background: color-mix(in srgb, var(--up) 12%, var(--card)); border: 1px solid color-mix(in srgb, var(--up) 40%, var(--rule)); }
.verdict.bad { background: color-mix(in srgb, var(--down) 10%, var(--card)); border: 1px solid color-mix(in srgb, var(--down) 35%, var(--rule)); }

/* ---- lab ---- */
.lab-grid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.kpi { border: 1px solid var(--rule); border-radius: 10px; background: var(--card); padding: 11px 13px; }
.kpi span { display: block; font-size: 12px; color: var(--ink-dim); }
.kpi b { font-size: 19px; font-weight: 650; letter-spacing: -.01em; font-variant-numeric: tabular-nums; }
.busy { color: var(--ink-dim); font-size: 14px; padding: 8px 0; }

.pill { display: inline-block; font-size: 11.5px; padding: 2px 8px; border-radius: 999px; background: var(--rule-soft); color: var(--ink-soft); margin-left: 6px; }
.done-tick { color: var(--up); font-weight: 700; }

hr.sep { border: none; border-top: 1px solid var(--rule); margin: 26px 0; }

@media print { .top, .foot, .lesson-nav, .chart-tools { display: none; } }