:root {
  --ink: #262730;
  --muted: #6b6f7b;
  --line: #d5d7de;
  --accent: #ff4b4b;
  --callout: #1f4e9a;
  --callout-line: #8fa6cc;
  --callout-fill: #f3f5fa;
  --up: #1e8e3e;
  --down: #c5221f;
  --exc: #d08c00;
  --bg: #ffffff;
}

* { box-sizing: border-box; }
html, body { margin: 0; background: #f6f7f9; color: var(--ink); font-family: Lato, "Helvetica Neue", Arial, sans-serif; font-size: 14px; }
.app { max-width: 1440px; margin: 16px auto; padding: 14px 16px 16px; background: var(--bg); border: 1px solid var(--line); border-radius: 4px; }
.top { display: grid; grid-template-columns: 350px minmax(0, 1fr) auto; gap: 14px; align-items: center; margin-bottom: 12px; }
.guide-btn { font: 700 13px Lato, sans-serif; color: var(--accent); background: #fff; border: 1px solid var(--accent); border-radius: 3px; padding: 6px 14px; cursor: pointer; }
.guide-btn:hover { background: #fff1f1; }
/* guide mode */
.guide-spot { position: fixed; z-index: 60; border-radius: 5px; box-shadow: 0 0 0 9999px rgba(20, 22, 30, .55); outline: 2px solid var(--accent); pointer-events: none; transition: all .25s ease; }
.guide-card { position: fixed; z-index: 61; width: 300px; max-width: calc(100vw - 16px); background: #fff; border-radius: 6px; box-shadow: 0 10px 30px rgba(0,0,0,.25); padding: 14px 16px 12px; transition: left .25s ease, top .25s ease; }
.guide-count { font-size: 11.5px; color: var(--muted); margin-bottom: 2px; }
.guide-title { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.guide-text { font-size: 13px; line-height: 1.5; }
.guide-buttons { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; gap: 8px; }
.guide-buttons button { font: 700 13px Lato, sans-serif; border-radius: 3px; padding: 6px 12px; cursor: pointer; }
.guide-next { background: var(--accent); color: #fff; border: 1px solid var(--accent); margin-left: 6px; }
.guide-back { background: #fff; color: var(--ink); border: 1px solid var(--line); }
.guide-skip { background: none; border: none; color: var(--muted); padding-left: 0 !important; font-weight: 400 !important; }
.brand { margin: 0 0 0 2px; font-size: 26px; font-weight: 900; letter-spacing: -0.2px; }
.about { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.45; }
.brand span { color: var(--accent); }

.layout { display: grid; grid-template-columns: 350px minmax(0, 1fr); gap: 14px; align-items: start; }
.left { display: flex; flex-direction: column; gap: 12px; }
.right { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.bottom { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; align-items: stretch; }

.panel { border: 1px solid var(--line); border-radius: 3px; padding: 12px 12px 14px; background: #fff; min-width: 0; }
.panel header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.panel h2 { margin: 0; font-size: 17px; font-weight: 700; }

/* selects */
.select { position: relative; }
.select select { appearance: none; -webkit-appearance: none; width: 100%; font: inherit; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 3px; padding: 6px 28px 6px 9px; cursor: pointer; }
.select::after { content: "\25BC"; position: absolute; right: 9px; top: 50%; transform: translateY(-50%); font-size: 11px; pointer-events: none; }
.select select:focus { outline: 2px solid #ffd1d1; border-color: var(--accent); }
.fnrow { display: flex; gap: 8px; }
.fnrow .grow { flex: 1; min-width: 0; }
.fnrow .dir { width: 82px; }
.fnrow .dir select { font-weight: 700; }

/* data properties: key/value list */
.ds-about { color: var(--muted); font-size: 12px; margin: 5px 0 0 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.props { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 12px 0 2px; }
.props dt { color: var(--muted); }
.props dd { margin: 0; }
.props dd select { font: inherit; color: inherit; border: none; border-bottom: 1px dashed var(--line); background: transparent; padding: 0 2px; cursor: pointer; }

/* blue info boxes */
.infobox { border: 1px solid var(--callout-line); background: var(--callout-fill); border-radius: 3px; }
.formula { margin-top: 10px; padding: 8px 8px 8px; font-size: 12.5px; }
.formula .head { margin-bottom: 9px; }
.formula table { border-collapse: collapse; }
.formula td { padding: 1px 12px 1px 0; vertical-align: top; }
.formula td:first-child { font-weight: 700; white-space: nowrap; }

/* tolerance sliders */
.tol { margin: 4px 0 16px; }
.tol:last-child { margin-bottom: 6px; }
.tol-name { font-weight: 700; font-size: 14.5px; }
.tol-desc { color: var(--muted); font-size: 12px; margin-top: 1px; }
.tol-row { display: flex; align-items: center; gap: 14px; margin-top: 6px; padding-left: 6px; }
.tol-row input { flex: 1; }
.tol-row output { width: 42px; text-align: right; color: var(--accent); font-weight: 700; font-size: 14.5px; }

.tol.off { opacity: .4; }
.tol.off input[type=range]::-webkit-slider-thumb { cursor: default; }
.tol.off input[type=range]::-moz-range-thumb { cursor: default; }
input[type=range] { -webkit-appearance: none; appearance: none; height: 16px; background: transparent; margin: 0; --pct: 50%; }
input[type=range]::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: linear-gradient(to right, var(--accent) var(--pct), var(--line) var(--pct)); }
input[type=range]::-moz-range-track { height: 4px; border-radius: 2px; background: linear-gradient(to right, var(--accent) var(--pct), var(--line) var(--pct)); }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: var(--accent); border: none; margin-top: -5px; cursor: pointer; }
input[type=range]::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); border: none; cursor: pointer; }

.run { width: 100%; border: none; border-radius: 3px; background: var(--accent); color: #fff; font: 700 15px Lato, sans-serif; padding: 10px; cursor: pointer; }
.run:hover { background: #f03a3a; }
.run:disabled { background: #f5a3a3; cursor: default; }
.pin { display: flex; align-items: center; justify-content: center; width: 28px; height: 26px; padding: 0; color: var(--accent); background: #fff; border: 1px solid var(--accent); border-radius: 3px; cursor: pointer; }
.pin svg { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linejoin: round; transform: rotate(45deg); transition: transform .15s; }
.pin[aria-pressed=true] { color: #fff; background: var(--accent); }
.pin[aria-pressed=true] svg { fill: currentColor; transform: none; }
.pin:disabled { color: #f5a3a3; border-color: #f5a3a3; background: #fff; cursor: default; }

/* context specification */
.dbody { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 18px; align-items: start; }
.axes { display: grid; grid-template-columns: 96px minmax(0, 1fr) 40px; align-items: center; column-gap: 10px; row-gap: 7px; }
.axes .th { font-size: 12px; font-weight: 700; padding-bottom: 6px; border-bottom: 1px solid var(--line); margin-bottom: 4px; }
.axes .num { text-align: right; }
.yslider { position: relative; display: flex; align-items: center; gap: 8px; padding-top: 14px; }
.yslider .bound { color: var(--muted); font-size: 12px; flex: none; }
.dual { position: relative; flex: 1; height: 16px; }
.dual .track { position: absolute; left: 0; right: 0; top: 6px; height: 4px; border-radius: 2px; background: var(--line); }
.dual .fill { position: absolute; top: 6px; height: 4px; background: var(--accent); }
.dual input { position: absolute; left: 0; top: 0; width: 100%; pointer-events: none; }
.dual input::-webkit-slider-runnable-track { background: transparent; }
.dual input::-moz-range-track { background: transparent; }
.dual input::-webkit-slider-thumb { pointer-events: auto; }
.dual input::-moz-range-thumb { pointer-events: auto; }
.dual .val { position: absolute; top: -16px; transform: translateX(-50%); color: var(--accent); font-weight: 700; font-size: 12px; white-space: nowrap; }

.ms { position: relative; min-height: 30px; border: 1px solid var(--line); border-radius: 3px; padding: 3px 26px 3px 4px; display: flex; flex-wrap: wrap; gap: 3px; align-items: center; cursor: pointer; background: #fff; }
.ms::after { content: "\25BC"; position: absolute; right: 9px; top: 50%; transform: translateY(-50%); font-size: 10px; color: var(--muted); }
.ms .placeholder { color: var(--muted); font-size: 12.5px; padding-left: 4px; }
.vchip { display: inline-flex; align-items: center; gap: 4px; background: #ffe4e4; border: 1px solid #ff8181; border-radius: 2px; padding: 1px 5px; font-size: 12px; font-weight: 700; white-space: nowrap; }
.vchip .x { color: var(--ink); font-weight: 400; cursor: pointer; padding: 0 1px; }
.vchip .x:hover { color: var(--accent); }
.ms-menu { position: absolute; z-index: 20; left: -1px; right: -1px; top: calc(100% + 2px); background: #fff; border: 1px solid var(--line); border-radius: 3px; box-shadow: 0 6px 18px rgba(0,0,0,.12); max-height: 280px; overflow: auto; padding: 4px 0; cursor: default; }
.ms-menu label { display: flex; align-items: center; gap: 8px; padding: 4px 10px; font-size: 13px; cursor: pointer; }
.ms-menu label:hover { background: #f4f5f8; }
.ms-menu input { accent-color: var(--accent); }
.ms-menu .cat { font-size: 11px; font-weight: 700; color: var(--muted); padding: 6px 10px 2px; text-transform: uppercase; letter-spacing: .3px; }

.ctxbox { padding: 10px 12px; }
.ctxbox .lab { font-size: 12px; font-weight: 700; }
.ctxbox .big { font-size: 28px; font-weight: 900; line-height: 1.1; }
.ctxbox .sub { color: var(--muted); font-size: 12px; margin-bottom: 10px; }
.ctxbox .warn { color: var(--down); font-size: 12px; margin-top: 6px; }

/* robust ranking */
.result { position: relative; min-height: 120px; }
.summary { margin: -2px 0 8px; display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.summary .order-note { color: var(--muted); font-size: 11.5px; }
.note { color: var(--muted); font-size: 12px; margin: -4px 0 8px; }
.tiers { display: grid; grid-template-columns: 62px minmax(0, 1fr); align-content: start; }   /* rows keep their height when there are few tiers */
.tiers { overflow-y: auto; }
/* always-visible scrollbars (overlay scrollbars hide until scrolled) */
.tiers::-webkit-scrollbar, .gridwrap::-webkit-scrollbar { width: 9px; height: 9px; }
.tiers::-webkit-scrollbar-track, .gridwrap::-webkit-scrollbar-track { background: #f1f2f5; border-radius: 5px; }
.tiers::-webkit-scrollbar-thumb, .gridwrap::-webkit-scrollbar-thumb { background: #b9bcc6; border-radius: 5px; }
.tiers::-webkit-scrollbar-thumb:hover, .gridwrap::-webkit-scrollbar-thumb:hover { background: #9a9eab; }
@supports not selector(::-webkit-scrollbar) { .tiers, .gridwrap { scrollbar-color: #b9bcc6 #f1f2f5; } }
.tiers .tl { font-size: 12.5px; font-weight: 700; padding: 6px 0; border-bottom: 1px solid #e6e7eb; }
.tiers .tc { display: grid; align-content: start; grid-template-columns: repeat(4, minmax(0, 150px)); gap: 3px 6px; padding: 5px 0; border-bottom: 1px solid #e6e7eb; }
.tiers .tl:nth-last-child(2), .tiers .tc:last-child { border-bottom: none; }
.chip { font-size: 12.5px; font-weight: 700; text-align: center; padding: 1px 4px; border: 1px solid; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chip.cu { border: 2px solid var(--up); padding: 0 3px; }
.chip.cd { border: 2px solid var(--down); padding: 0 3px; }
.chip.cb { border: 2px solid var(--exc); padding: 0 3px; }
.chip b { font-weight: 400; margin-right: 2px; }
.up { color: var(--up); } .down { color: var(--down); } .exc { color: var(--exc); }
.arrows-legend { display: flex; gap: 28px; font-size: 12.5px; margin-top: 12px; }
.arrows-legend b { font-weight: 400; }
.empty { color: var(--muted); padding: 24px 0; }
.stale .result, .stale .gridwrap { opacity: .4; }
.busy { color: var(--muted); }

/* where this ranking holds */
#panelF { min-width: 250px; }
.fgrid { border-collapse: separate; border-spacing: 2px; margin: 0 auto; }
.fgrid th.yr { height: 44px; vertical-align: bottom; padding: 0; }
.fgrid th.yr div { transform: translate(6px, -2px) rotate(-45deg); transform-origin: left bottom; width: 14px; white-space: nowrap; font-weight: 400; font-size: 12px; color: var(--muted); }
.fgrid td.rl { text-align: right; font-size: 12.5px; padding-right: 8px; white-space: nowrap; }
.fgrid td.c { text-align: center; font-weight: 700; font-size: 15px; cursor: default; }
.fgrid td.G { background: #d2ead8; color: var(--up); }
.fgrid td.Y { background: #f5e5c0; color: var(--exc); }
.fgrid td.R { background: #f6d3d2; color: var(--down); font-weight: 400; }
.fgrid td.c:hover { outline: 2px solid var(--ink); }
.flegend { margin: 16px auto 0; font-size: 12.5px; display: table; }
.flegend div { margin: 4px 0; }
.flegend b { display: inline-block; width: 18px; text-align: center; margin-right: 4px; }

.tip { position: fixed; z-index: 50; max-width: 320px; background: #262730; color: #fff; font-size: 12px; line-height: 1.45; padding: 8px 10px; border-radius: 4px; pointer-events: none; box-shadow: 0 4px 14px rgba(0,0,0,.2); }
.tip ol { list-style: none; margin: 0; padding: 0; column-gap: 14px; }
.tip li { break-inside: avoid; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; line-height: 1.4; }
.tip li.tb { border-top: 1px solid rgba(255,255,255,.45); padding-top: 1px; margin-top: 1px; }
.tip li .rk { display: inline-block; min-width: 22px; color: rgba(255,255,255,.55); text-align: right; margin-right: 6px; }
.tip li b { font-weight: 700; margin-right: 3px; }
.tip li .tu { color: #34d058; } .tip li .td { color: #ff3b30; }
.tip .more { color: rgba(255,255,255,.6); margin-top: 3px; }

/* desktop: the page is as tall as the left column; panels E and F fill the rest and scroll inside */
@media (min-width: 1101px) {
  .layout { align-items: stretch; }
  .right { contain: size; }
  .bottom { flex: 1 1 0; min-height: 0; grid-template-rows: minmax(0, 1fr); }
  #panelE, #panelF { display: flex; flex-direction: column; min-height: 0; }
  #panelE .result { flex: 1 1 0; min-height: 0; display: flex; flex-direction: column; }
  #panelE .tiers { flex: 1 1 0; min-height: 0; padding-right: 6px; }
  #panelF .gridwrap { flex: 1 1 0; min-height: 0; overflow: auto; }
}
@media (max-width: 1100px) {
  .tiers { max-height: 70vh; padding-right: 6px; }
  .top { grid-template-columns: 1fr; gap: 6px; }
  .guide-btn { justify-self: start; }
  .layout { grid-template-columns: 1fr; }
  .bottom { grid-template-columns: 1fr; }
  .dbody { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .app { margin: 0; border: none; padding: 12px 16px; }
  .tiers .tc { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .axes { grid-template-columns: 80px minmax(0, 1fr) 28px; }
}

/* footer: disclaimer, credit, copyright */
.foot { margin-top: 14px; padding-top: 10px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11.5px; line-height: 1.5; }
.foot p { margin: 0 0 4px; }
.foot a { color: inherit; text-decoration: underline; text-decoration-color: var(--line); }
.foot a:hover { color: var(--ink); }
.foot .disclaimer b { color: var(--ink); font-weight: 700; }