/* =======================================================================
   TRADE-OFF STUDY  —  stylesheet
   =======================================================================

   Every selector is namespaced `ts-` (or scoped under `.ts-wrap`) so this can
   be dropped into an existing site without colliding. Only the colour tokens
   sit on :root; nothing else is global.

   Theming: tokens are redefined under `prefers-color-scheme: dark` and again
   under `:root[data-theme="dark"] / ["light"]`, so an explicit toggle beats the
   OS preference in both directions. Style through the tokens, never inside the
   media query, or the toggle stops working one way.
   ===================================================================== */

:root {
  --ts-paper:      #f2f5f4;
  --ts-card:       #ffffff;
  --ts-sunk:       #eaefee;
  --ts-rule:       #d2dcda;
  --ts-rule-soft:  #e3eae9;
  --ts-ink:        #0e1619;
  --ts-ink-soft:   #3d5158;
  --ts-ink-faint:  #6d8288;
  --ts-slate:      #35606e;
  --ts-brass:      #8a6414;
  --ts-good:       #1f6b4c;
  --ts-mid:        #7d6015;
  --ts-bad:        #93412f;
  --ts-shadow:     0 1px 2px rgba(14,22,25,.06), 0 8px 24px -14px rgba(14,22,25,.18);

  --ts-display: Georgia, "Iowan Old Style", "Source Serif 4", "Times New Roman", serif;
  --ts-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --ts-data: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ts-paper: #0c1214; --ts-card: #141d20; --ts-sunk: #101819;
    --ts-rule: #27373b; --ts-rule-soft: #1d2a2d;
    --ts-ink: #e6edec; --ts-ink-soft: #a8bcbe; --ts-ink-faint: #74898d;
    --ts-slate: #6ea3b3; --ts-brass: #d2a54e;
    --ts-good: #5fb98d; --ts-mid: #cba96a; --ts-bad: #e08469;
    --ts-shadow: 0 1px 2px rgba(0,0,0,.4), 0 10px 28px -16px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"] {
  --ts-paper: #0c1214; --ts-card: #141d20; --ts-sunk: #101819;
  --ts-rule: #27373b; --ts-rule-soft: #1d2a2d;
  --ts-ink: #e6edec; --ts-ink-soft: #a8bcbe; --ts-ink-faint: #74898d;
  --ts-slate: #6ea3b3; --ts-brass: #d2a54e;
  --ts-good: #5fb98d; --ts-mid: #cba96a; --ts-bad: #e08469;
  --ts-shadow: 0 1px 2px rgba(0,0,0,.4), 0 10px 28px -16px rgba(0,0,0,.6);
}
:root[data-theme="light"] {
  --ts-paper: #f2f5f4; --ts-card: #ffffff; --ts-sunk: #eaefee;
  --ts-rule: #d2dcda; --ts-rule-soft: #e3eae9;
  --ts-ink: #0e1619; --ts-ink-soft: #3d5158; --ts-ink-faint: #6d8288;
  --ts-slate: #35606e; --ts-brass: #8a6414;
  --ts-good: #1f6b4c; --ts-mid: #7d6015; --ts-bad: #93412f;
  --ts-shadow: 0 1px 2px rgba(14,22,25,.06), 0 8px 24px -14px rgba(14,22,25,.18);
}

.ts-wrap, .ts-wrap * { box-sizing: border-box; }
.ts-wrap {
  max-width: 1080px; margin: 0 auto; padding: 0 24px 72px;
  background: var(--ts-paper); color: var(--ts-ink);
  font-family: var(--ts-body); font-size: 15px; line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
.ts-wrap a { color: var(--ts-slate); text-decoration-thickness: 1px; text-underline-offset: 2px; }
.ts-wrap :focus-visible { outline: 2px solid var(--ts-brass); outline-offset: 2px; border-radius: 2px; }
.ts-num, .ts-wrap .num { font-family: var(--ts-data); font-variant-numeric: tabular-nums; }
.ts-dim { color: var(--ts-ink-faint); }
.ts-thin { display: block; font-size: 11.5px; color: var(--ts-ink-faint); margin-top: 4px; line-height: 1.5; }
.ts-thin.warn { color: var(--ts-bad); }
.ts-refhint { color: var(--ts-brass); }

/* masthead */
.ts-masthead { padding: 46px 0 26px; border-bottom: 1px solid var(--ts-rule); }
.ts-mastrow { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.ts-eyebrow {
  font-size: 11px; letter-spacing: .13em; text-transform: uppercase;
  color: var(--ts-ink-faint); font-weight: 600; margin: 0;
}
.ts-verline {
  font-family: var(--ts-data); font-size: 10.5px; color: var(--ts-ink-faint);
  margin-left: auto;
}
.ts-masthead h1 {
  font-family: var(--ts-display); font-weight: 400;
  font-size: clamp(1.9rem, 4.6vw, 2.85rem); line-height: 1.06;
  letter-spacing: -.02em; margin: 0 0 14px; text-wrap: balance;
}
.ts-lede { max-width: 66ch; color: var(--ts-ink-soft); margin: 0; font-size: 16px; }

.ts-themeswitch {
  display: inline-flex; flex: 0 0 auto; overflow: hidden;
  border: 1px solid var(--ts-rule); border-radius: 100px; background: var(--ts-card);
}
.ts-themeswitch button {
  font: inherit; font-size: 11px; letter-spacing: .05em; padding: 5px 12px;
  border: 0; background: transparent; color: var(--ts-ink-faint); cursor: pointer;
}
.ts-themeswitch button + button { border-left: 1px solid var(--ts-rule-soft); }
.ts-themeswitch button:hover { color: var(--ts-ink); }
.ts-themeswitch button[aria-pressed="true"] {
  background: var(--ts-slate); color: var(--ts-paper); font-weight: 600;
}

/* panels */
.ts-stack { display: flex; flex-direction: column; gap: 26px; padding-top: 28px; }
.ts-panel {
  background: var(--ts-card); border: 1px solid var(--ts-rule);
  border-radius: 4px; box-shadow: var(--ts-shadow); overflow: hidden;
}
.ts-panel[hidden] { display: none; }
.ts-head {
  padding: 15px 22px 13px; border-bottom: 1px solid var(--ts-rule);
  display: flex; justify-content: space-between; align-items: baseline; gap: 14px;
}
.ts-head h2 {
  font-family: var(--ts-display); font-weight: 400; font-size: 1.16rem;
  margin: 0; letter-spacing: -.01em;
}
.ts-head p { margin: 0; font-size: 12px; color: var(--ts-ink-faint); text-align: right; }
.ts-body { padding: 20px 22px 22px; }
.ts-prompt { font-size: 13.5px; color: var(--ts-ink-soft); margin: 0 0 14px; max-width: 76ch; }
.ts-prompt b { color: var(--ts-ink); }

/* form */
.ts-wrap fieldset {
  border: 0; margin: 0; padding: 14px 0;
  border-top: 1px solid var(--ts-rule-soft);
}
.ts-wrap fieldset:first-of-type { border-top: 0; padding-top: 0; }
.ts-wrap legend {
  font-size: 10.5px; letter-spacing: .11em; text-transform: uppercase;
  color: var(--ts-ink-faint); font-weight: 700; padding: 0; margin-bottom: 10px;
}
.ts-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px 22px; align-items: start; padding: 14px 0;
  border-top: 1px solid var(--ts-rule-soft);
}
.ts-fld { display: block; }
.ts-lbl {
  display: flex; justify-content: space-between; align-items: baseline; gap: 8px;
  font-size: 12.5px; color: var(--ts-ink-soft); margin-bottom: 5px; font-weight: 500;
}
.ts-lbl b {
  font-family: var(--ts-data); font-variant-numeric: tabular-nums;
  color: var(--ts-ink); font-weight: 600;
}
.ts-wrap select, .ts-wrap input[type="number"], .ts-wrap input[type="text"] {
  width: 100%; padding: 7px 9px; font: inherit; font-size: 13.5px;
  color: var(--ts-ink); background: var(--ts-sunk);
  border: 1px solid var(--ts-rule); border-radius: 3px;
}
.ts-wrap input[type="range"] { width: 100%; accent-color: var(--ts-slate); margin: 2px 0 0; }
.ts-chk { display: flex; gap: 9px; align-items: flex-start; font-size: 13px; cursor: pointer; }
.ts-chk input { margin: 3px 0 0; accent-color: var(--ts-slate); flex: 0 0 auto; }
.ts-chk span { color: var(--ts-ink-soft); line-height: 1.45; }
.ts-modepick { display: flex; flex-direction: column; gap: 9px; }
.ts-bar { display: flex; align-items: center; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.ts-primary {
  font: inherit; font-size: 13px; font-weight: 600; padding: 8px 16px; cursor: pointer;
  background: var(--ts-slate); color: var(--ts-paper);
  border: 1px solid var(--ts-slate); border-radius: 3px;
}
.ts-primary:disabled { opacity: .5; cursor: default; }
.ts-ghost, .ts-presets button {
  font: inherit; font-size: 11.5px; padding: 4px 9px; cursor: pointer;
  background: var(--ts-sunk); color: var(--ts-ink-soft);
  border: 1px solid var(--ts-rule); border-radius: 100px;
}
.ts-ghost:hover, .ts-presets button:hover { border-color: var(--ts-slate); color: var(--ts-ink); }
.ts-presets { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.ts-ladder { display: block; margin-top: 5px; color: var(--ts-brass); }

/* characteristic picker: levels inline, reference marked */
.ts-attrpick {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(268px, 1fr)); gap: 10px;
}
.ts-attrcell {
  display: flex; gap: 9px; align-items: flex-start; cursor: pointer;
  padding: 9px 11px; border: 1px solid var(--ts-rule-soft); border-radius: 3px;
  background: var(--ts-sunk); transition: border-color .12s, opacity .12s;
}
.ts-attrcell:hover { border-color: var(--ts-slate); }
.ts-attrcell input { margin: 2px 0 0; accent-color: var(--ts-slate); flex: 0 0 auto; }
.ts-attrcell.off { opacity: .5; }
.ts-attrcell.off:hover { opacity: .8; }
.ts-attrcell .nm {
  display: block; font-size: 12.5px; font-weight: 600; color: var(--ts-ink); margin-bottom: 3px;
}
.ts-attrcell .nm em {
  font-style: normal; font-weight: 400; color: var(--ts-ink-faint); font-size: 11px;
}
.ts-attrcell .lv { display: block; font-size: 11px; line-height: 1.55; color: var(--ts-ink-faint); }
.ts-attrcell .lv .ref { color: var(--ts-brass); }
.ts-attrcell .lv .sep { font-style: normal; opacity: .45; margin: 0 3px; }

/* adequacy / diagnostics strip */
.ts-adequacy {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  border: 1px solid var(--ts-rule); border-radius: 3px; overflow: hidden;
  background: var(--ts-sunk); margin: 16px 0 0;
}
.ts-adequacy div { padding: 10px 14px; border-right: 1px solid var(--ts-rule-soft); }
.ts-adequacy div:last-child { border-right: 0; }
.ts-adequacy dt {
  font-size: 10px; letter-spacing: .09em; text-transform: uppercase;
  color: var(--ts-ink-faint); font-weight: 600; margin-bottom: 3px;
}
.ts-adequacy dd {
  margin: 0; font-family: var(--ts-data); font-size: 16px; font-variant-numeric: tabular-nums;
}
.ts-adequacy dd.bad { color: var(--ts-bad); }
.ts-adequacy dd.ok { color: var(--ts-good); }

/* questionnaire */
.ts-progtrack {
  height: 5px; background: var(--ts-sunk); border-radius: 100px; overflow: hidden;
  margin-bottom: 18px; border: 1px solid var(--ts-rule-soft);
}
.ts-progfill { height: 100%; background: var(--ts-brass); border-radius: 100px; width: 0; }
.ts-cards { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(178px, 1fr)); }
.ts-card {
  border: 1px solid var(--ts-rule); border-radius: 4px; background: var(--ts-sunk);
  cursor: pointer; display: flex; flex-direction: column; min-width: 0;
}
.ts-card:hover { border-color: var(--ts-slate); }
.ts-card.marked {
  border-color: var(--ts-brass);
  background: color-mix(in srgb, var(--ts-brass) 8%, var(--ts-sunk));
}
.ts-cardhead {
  display: flex; align-items: center; gap: 9px; padding: 10px 12px;
  border-bottom: 1px solid var(--ts-rule-soft);
}
.ts-badge {
  width: 21px; height: 21px; border-radius: 50%; display: grid; place-items: center;
  font-family: var(--ts-data); font-size: 11px; font-weight: 700; flex: 0 0 auto;
  border: 1px solid var(--ts-rule); color: var(--ts-ink-faint); background: var(--ts-card);
}
.ts-card.marked .ts-badge { background: var(--ts-brass); border-color: var(--ts-brass); color: var(--ts-paper); }
.ts-pay {
  font-family: var(--ts-data); font-size: 15.5px; font-weight: 600;
  color: var(--ts-brass); font-variant-numeric: tabular-nums; margin-left: auto;
}
.ts-cardrows { padding: 9px 12px 12px; display: flex; flex-direction: column; gap: 7px; margin: 0; }
.ts-cardrows dt {
  font-size: 9.5px; letter-spacing: .07em; text-transform: uppercase;
  color: var(--ts-ink-faint); font-weight: 600;
}
.ts-cardrows dd { margin: 0; font-size: 12.5px; line-height: 1.35; }
.ts-scale { display: grid; grid-template-columns: repeat(5, 1fr); gap: 3px; padding: 0 10px 11px; margin-top: auto; }
.ts-ratebtn {
  font: inherit; font-family: var(--ts-data); font-size: 11.5px; padding: 5px 0; cursor: pointer;
  background: var(--ts-card); color: var(--ts-ink-soft);
  border: 1px solid var(--ts-rule); border-radius: 2px;
}
.ts-ratebtn:hover { border-color: var(--ts-slate); color: var(--ts-ink); }
.ts-ratebtn.on { background: var(--ts-brass); border-color: var(--ts-brass); color: var(--ts-paper); font-weight: 700; }

/* importance bars */
.ts-impbar {
  display: grid; grid-template-columns: 22px minmax(0,1fr) 118px 96px 58px;
  gap: 12px; align-items: center; font-size: 13px; margin-bottom: 9px;
}
.ts-impbar .rk {
  font-family: var(--ts-data); font-size: 11.5px; color: var(--ts-ink-faint);
  text-align: right; font-variant-numeric: tabular-nums;
}
.ts-impbar .tr { height: 9px; background: var(--ts-sunk); border-radius: 1px; overflow: hidden; }
/* display:block matters: a nested span stays inline, and width/height do not
   apply to non-replaced inline boxes, so the fill would render as nothing. */
.ts-impbar .fl { display: block; height: 100%; background: var(--ts-slate); border-radius: 1px; }
.ts-impbar .vl {
  font-family: var(--ts-data); font-size: 12.5px; text-align: right;
  color: var(--ts-brass); font-weight: 600; font-variant-numeric: tabular-nums;
}
.ts-impbar .vl .se { display: block; font-weight: 400; font-size: 11px; color: var(--ts-ink-faint); }
.ts-conf {
  font-size: 9.5px; letter-spacing: .06em; text-transform: uppercase; font-weight: 700;
  padding: 1px 5px; border-radius: 100px; border: 1px solid currentColor;
  justify-self: end; white-space: nowrap;
}
.ts-conf.hi { color: var(--ts-good); }
.ts-conf.md { color: var(--ts-mid); }
.ts-conf.lo { color: var(--ts-bad); }
@media (max-width: 620px) {
  .ts-impbar { grid-template-columns: 20px minmax(0,1fr) 88px 54px; }
  .ts-impbar .tr { display: none; }
}

/* part-worth table */
.ts-pw { width: 100%; border-collapse: collapse; font-size: 13px; }
.ts-pw th {
  text-align: left; font-size: 10px; letter-spacing: .09em; text-transform: uppercase;
  color: var(--ts-ink-faint); font-weight: 700; padding: 0 8px 8px 0;
  border-bottom: 1px solid var(--ts-rule);
}
.ts-pw th.r, .ts-pw td.r { text-align: right; }
.ts-pw td { padding: 6px 8px 6px 0; border-bottom: 1px solid var(--ts-rule-soft); }
.ts-pw tr.attr td {
  font-weight: 600; padding-top: 13px; border-bottom: 1px solid var(--ts-rule);
  font-family: var(--ts-display); font-size: 14.5px;
}
.ts-pw td.ref { color: var(--ts-ink-faint); font-style: italic; }
.ts-pw td.num {
  font-family: var(--ts-data); font-variant-numeric: tabular-nums; white-space: nowrap;
}
.ts-pw td.num.up { color: var(--ts-good); }
.ts-pw td.num.down { color: var(--ts-bad); }
.ts-pw .se { color: var(--ts-ink-faint); font-size: 11px; display: block; font-weight: 400; }

/* notes, insights, equivalence */
.ts-note {
  background: var(--ts-sunk); border: 1px solid var(--ts-rule);
  border-left: 3px solid var(--ts-slate); border-radius: 3px;
  padding: 14px 18px; font-size: 13px; color: var(--ts-ink-soft); margin-bottom: 12px;
}
.ts-note.bad { border-left-color: var(--ts-bad); }
.ts-note.warn { border-left-color: var(--ts-mid); }
.ts-note h3 {
  font-size: 12px; letter-spacing: .06em; text-transform: uppercase;
  color: var(--ts-ink); margin: 0 0 7px; font-weight: 700;
}
.ts-note p { margin: 0; }
.ts-rec {
  border: 1px solid var(--ts-rule); border-radius: 3px; padding: 14px 16px;
  background: var(--ts-sunk); margin-bottom: 14px;
}
.ts-rec h4 {
  font-family: var(--ts-display); font-weight: 400; font-size: 1.07rem; margin: 0 0 7px;
}
.ts-rec p { margin: 0; font-size: 12.5px; color: var(--ts-ink-soft); }
.ts-rec p b { color: var(--ts-ink); font-weight: 600; }
.ts-empty { color: var(--ts-ink-faint); font-size: 13px; margin: 0; }

.ts-eqgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 700px) { .ts-eqgrid { grid-template-columns: 1fr; } }
.ts-eqcol h4 {
  font-size: 10.5px; letter-spacing: .09em; text-transform: uppercase;
  color: var(--ts-ink-faint); font-weight: 700; margin: 0 0 9px;
}
.ts-eqcol label { display: block; margin-bottom: 8px; font-size: 12px; color: var(--ts-ink-soft); }
.ts-eqcol select { margin-top: 3px; }
.ts-verdict {
  margin-top: 18px; padding: 15px 18px; border-radius: 3px;
  background: var(--ts-sunk); border: 1px solid var(--ts-rule);
  border-left: 3px solid var(--ts-brass);
}
.ts-verdict .ts-big {
  font-family: var(--ts-data); font-size: clamp(1.25rem, 3.4vw, 1.75rem); font-weight: 600;
  color: var(--ts-brass); letter-spacing: -.02em; font-variant-numeric: tabular-nums;
}
.ts-verdict p { margin: 6px 0 0; font-size: 13px; color: var(--ts-ink-soft); }

/* keys */
.ts-keyrow { display: flex; gap: 8px; align-items: stretch; flex-wrap: wrap; margin-top: 6px; }
.ts-keyrow input {
  flex: 1 1 260px; min-width: 0; font-family: var(--ts-data); font-size: 12px;
}
.ts-keyrow button { flex: 0 0 auto; }
.ts-fp { font-family: var(--ts-data); font-size: 12.5px; color: var(--ts-brass); font-weight: 600; }

/* method */
.ts-method { font-size: 12.5px; color: var(--ts-ink-faint); }
.ts-method h3 {
  font-family: var(--ts-display); font-weight: 400; font-size: 1.05rem;
  color: var(--ts-ink); margin: 0 0 8px;
}
.ts-method h3 + p { margin-top: 0; }
.ts-method p { margin: 0 0 9px; max-width: 78ch; }
.ts-method p.ts-ref { padding-left: 14px; border-left: 2px solid var(--ts-rule); }
.ts-method ul { margin: 0 0 9px; padding-left: 20px; max-width: 78ch; }
.ts-method li { margin-bottom: 4px; }
.ts-method code {
  font-family: var(--ts-data); font-size: 12px; background: var(--ts-card);
  padding: 1px 4px; border-radius: 2px; border: 1px solid var(--ts-rule-soft);
}

@media (prefers-reduced-motion: no-preference) {
  .ts-impbar .fl, .ts-progfill { transition: width .28s cubic-bezier(.4,0,.2,1); }
}