/* ==========================================================================
   SustainGHG - Methodology Prediction Engine
   Plain white, one green accent, generous spacing, big touch targets.
   Light only, deliberately - every colour is painted, nothing inherited.
   ========================================================================== */

:root {
  --paper:   #FFFFFF;
  --wash:    #F7F8F7;
  --ink:     #16181B;
  --ink-2:   #5C646B;
  --ink-3:   #949BA1;
  --line:    #E6E8E6;
  --line-2:  #D2D6D2;

  --green:      #0E6B4A;
  --green-dark: #0A5439;
  --green-wash: #F1F8F4;
  --green-line: #BEDCCC;

  --amber:      #8A5A0B;
  --amber-wash: #FDF8EF;
  --amber-line: #EBD9B8;

  --red:      #B3261E;
  --red-wash: #FDF4F3;
  --red-line: #EDC7C3;

  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --r: 8px;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--wash);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -.015em; text-wrap: balance; }
p, ul, ol { margin: 0; }
:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; border-radius: 4px; }

.page { max-width: 720px; margin: 0 auto; padding: 0 20px; }
.page.wide { max-width: 1000px; }

/* -------------------------------------------------------------- topbar --- */

.topbar { background: var(--paper); border-bottom: 1px solid var(--line); }
.topbar-inner {
  max-width: 1000px; margin: 0 auto; padding: 0 20px;
  height: 58px; display: flex; align-items: center; gap: 26px;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.brand-mark { color: var(--green); display: flex; }
.brand-name { font-size: 15px; }

.tabs { display: flex; gap: 22px; }
.tab {
  appearance: none; background: none; border: 0; cursor: pointer; font: inherit;
  font-size: 14px; color: var(--ink-2); padding: 19px 0 17px;
  border-bottom: 2px solid transparent;
}
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { color: var(--ink); font-weight: 500; border-bottom-color: var(--green); }

/* --------------------------------------------------------------- intro --- */

.intro { padding: 44px 0 26px; }
.intro h1 { font-size: 27px; line-height: 1.25; }
.intro p { color: var(--ink-2); margin-top: 10px; max-width: 60ch; }
.intro .stats { margin-top: 14px; font-size: 14px; color: var(--ink-2); }
.intro .stats b { color: var(--ink); }

/* ---------------------------------------------------------------- card --- */

.card {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--r); padding: 22px; margin-bottom: 18px;
}
.card-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 16px; }
.card-head h2 { font-size: 16px; }
.link {
  appearance: none; background: none; border: 0; cursor: pointer; font: inherit;
  font-size: 13.5px; color: var(--green); margin-left: auto; padding: 0;
  text-decoration: underline; text-underline-offset: 3px;
}
.link:hover { color: var(--green-dark); }

/* ------------------------------------------------------------ examples --- */

.examples { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 10px; }
.example {
  appearance: none; font: inherit; text-align: left; cursor: pointer;
  background: var(--paper); border: 1px solid var(--line-2); border-radius: var(--r);
  padding: 13px 15px; display: flex; flex-direction: column; gap: 4px;
  transition: border-color .14s, background .14s;
}
.example:hover { border-color: var(--green); background: var(--green-wash); }
.example[aria-pressed="true"] { border-color: var(--green); background: var(--green-wash); box-shadow: inset 0 0 0 1px var(--green); }
.example-name { font-size: 14px; font-weight: 600; line-height: 1.35; }
.example-desc { font-size: 12.5px; color: var(--ink-2); line-height: 1.45; }
.example-out {
  font-size: 12.5px; color: var(--green); display: inline-flex; align-items: center;
  gap: 4px; margin-top: 3px; font-weight: 500;
}
.example-out.warn { color: var(--amber); }

/* ---------------------------------------------------------------- form --- */

.form-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 15px 16px; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field-label { font-size: 13.5px; font-weight: 500; color: var(--ink); }
.field-sm .field-label { font-size: 13px; font-weight: 400; color: var(--ink-2); }

.field-block { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line); }
.field-block.quiet { opacity: .9; }
.block-hint { font-size: 13px; color: var(--ink-2); margin-bottom: 14px; max-width: 62ch; }

input[type="text"], input[type="number"], input[type="search"], select {
  font: inherit; font-size: 14.5px; color: var(--ink);
  background: var(--paper); border: 1px solid var(--line-2);
  border-radius: 6px; padding: 9px 11px; width: 100%; height: 40px;
  transition: border-color .14s, box-shadow .14s;
}
input:hover, select:hover { border-color: var(--ink-3); }
input:focus, select:focus { outline: none; border-color: var(--green); box-shadow: 0 0 0 3px var(--green-wash); }
select {
  appearance: none; padding-right: 30px; cursor: pointer;
  background-image: linear-gradient(45deg, transparent 50%, currentColor 50%), linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position: right 14px center, right 9px center;
  background-size: 5px 5px, 5px 5px; background-repeat: no-repeat;
}
.pair { display: grid; grid-template-columns: 1fr 118px; gap: 7px; }

.actions { display: flex; align-items: center; gap: 12px; margin-top: 24px; flex-wrap: wrap; }

.btn {
  appearance: none; font: inherit; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 11px 18px; border-radius: 6px; font-size: 14.5px; font-weight: 500;
  border: 1px solid var(--line-2); background: var(--paper); color: var(--ink);
  transition: border-color .14s, background .14s;
}
.btn:hover { border-color: var(--ink-3); }
.btn-primary { background: var(--green); border-color: var(--green); color: #fff; padding: 12px 26px; font-size: 15px; }
.btn-primary:hover { background: var(--green-dark); border-color: var(--green-dark); }
.btn-quiet { border-color: transparent; color: var(--ink-2); background: none; }
.btn-quiet:hover { color: var(--ink); border-color: var(--line-2); }
.btn-sm { padding: 7px 12px; font-size: 13px; }

.stale {
  display: flex; gap: 9px; align-items: flex-start; margin-top: 20px;
  background: var(--amber-wash); border: 1px solid var(--amber-line);
  border-radius: 6px; padding: 11px 13px; font-size: 13.5px; color: var(--ink-2);
}
.stale > span:first-child { color: var(--amber); display: flex; padding-top: 2px; }

/* ------------------------------------------------------------ progress --- */

.progress {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--r);
  padding: 18px 22px; margin-bottom: 18px;
}
.prog-row { display: flex; align-items: center; gap: 11px; padding: 6px 0; font-size: 14.5px; color: var(--ink-2); }
.prog-ico { display: flex; width: 16px; justify-content: center; color: var(--ink-3); }
.prog-row.good { color: var(--ink); }
.prog-row.good .prog-ico { color: var(--green); }
.prog-row.bad { color: var(--red); }
.prog-row.bad .prog-ico { color: var(--red); }
.spinner {
  width: 12px; height: 12px; border-radius: 50%;
  border: 2px solid var(--line-2); border-top-color: var(--ink-3); animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* -------------------------------------------------------------- answer --- */

.answer {
  background: var(--paper); border: 1px solid var(--green-line);
  border-radius: var(--r); padding: 30px 26px 26px; text-align: center;
  animation: pop .3s ease;
}
@keyframes pop { from { opacity: 0; transform: translateY(6px); } }
.answer.warn { border-color: var(--amber-line); }
.answer.bad  { border-color: var(--red-line); }

.answer-mark {
  width: 46px; height: 46px; border-radius: 50%; margin: 0 auto 16px;
  display: grid; place-items: center;
  background: var(--green-wash); color: var(--green); border: 1px solid var(--green-line);
}
.answer.warn .answer-mark { background: var(--amber-wash); color: var(--amber); border-color: var(--amber-line); }
.answer.bad  .answer-mark { background: var(--red-wash); color: var(--red); border-color: var(--red-line); }

.answer-lead { font-size: 14px; color: var(--ink-2); }
.answer-name { font-size: 30px; line-height: 1.15; margin-top: 4px; color: var(--green); }
.answer-name.small { font-size: 22px; color: var(--ink); }
.answer.bad .answer-name { color: var(--red); }
.answer-why {
  font-size: 15px; color: var(--ink-2); line-height: 1.65;
  max-width: 54ch; margin: 14px auto 0;
}
.answer-why b { color: var(--ink); font-weight: 600; }

.answer-facts {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 0;
  margin-top: 24px; border: 1px solid var(--line); border-radius: 6px; overflow: hidden;
}
.fact { flex: 1 1 150px; padding: 12px 14px; border-right: 1px solid var(--line); }
.fact:last-child { border-right: 0; }
.fact-k { display: block; font-size: 12px; color: var(--ink-3); }
.fact-v { display: block; font-size: 14.5px; font-weight: 600; margin-top: 2px; }

.answer-tier {
  margin-top: 14px; font-size: 13.5px; color: var(--ink-2);
  display: inline-flex; align-items: center; gap: 6px;
}
.answer-tier svg { color: var(--ink-3); flex: none; }
.answer-actions { display: flex; justify-content: center; gap: 10px; margin-top: 26px; flex-wrap: wrap; }

.fixlist, .optionlist { list-style: none; padding: 0; margin: 20px auto 0; max-width: 46ch; text-align: left; }
.fixlist li {
  font-size: 14px; color: var(--ink-2); background: var(--red-wash);
  border: 1px solid var(--red-line); border-radius: 6px; padding: 10px 13px; margin-bottom: 8px;
}
.optionlist li { margin-bottom: 8px; }
.optbtn {
  appearance: none; font: inherit; cursor: pointer; width: 100%; text-align: left;
  display: flex; align-items: center; gap: 10px;
  background: var(--paper); border: 1px solid var(--line-2); border-radius: 6px; padding: 12px 14px;
  transition: border-color .14s, background .14s;
}
.optbtn:hover { border-color: var(--green); background: var(--green-wash); }
.opt-need { font-size: 14px; font-weight: 600; }
.opt-arrow { color: var(--ink-3); display: flex; }
.opt-meth { font-size: 13.5px; color: var(--ink-2); margin-left: auto; }

/* ------------------------------------------------------------- details --- */

.details { background: var(--paper); border: 1px solid var(--line); border-radius: var(--r); margin-top: 14px; }
.details > summary {
  list-style: none; cursor: pointer; padding: 15px 22px;
  display: flex; align-items: center; gap: 10px; font-size: 14.5px; font-weight: 500;
}
.details > summary::-webkit-details-marker { display: none; }
.details > summary:hover { color: var(--green); }
.sum-caret { margin-left: auto; color: var(--ink-3); display: flex; transition: transform .18s; }
.details[open] .sum-caret { transform: rotate(180deg); }
.details-body { padding: 4px 22px 24px; border-top: 1px solid var(--line); }

.det-block { padding-top: 22px; }
.det-block h3 { font-size: 14.5px; margin-bottom: 8px; }
.det-note { font-size: 13.5px; color: var(--ink-2); margin-bottom: 12px; max-width: 62ch; }
.det-note svg { color: var(--ink-3); vertical-align: -2px; }

.checklist { list-style: none; padding: 0; }
.checklist li {
  display: flex; align-items: center; gap: 9px; padding: 7px 0;
  border-bottom: 1px solid var(--line); font-size: 14px;
}
.checklist li:last-child { border-bottom: 0; }
.checklist li svg { color: var(--green); flex: none; }
.checklist li.warn svg { color: var(--amber); }
.checklist li.fail svg { color: var(--red); }
.checklist li em { margin-left: auto; font-style: normal; font-size: 12.5px; color: var(--ink-3); }

.rulelist { list-style: none; padding: 0; }
.rulelist li {
  display: flex; align-items: flex-start; gap: 10px; padding: 11px 12px;
  border: 1px solid var(--line); border-radius: 6px; margin-bottom: 7px; font-size: 14px;
}
.rulelist li.hit { border-color: var(--green-line); background: var(--green-wash); }
.rulelist .rl-ico { display: flex; padding-top: 3px; color: var(--ink-3); }
.rulelist li.hit .rl-ico { color: var(--green); }
.rulelist li.miss .rl-ico { color: var(--red); }
.rulelist li.lower .rl-ico { color: var(--amber); }
.rl-main { display: flex; flex-direction: column; min-width: 0; }
.rl-why { font-size: 13px; color: var(--ink-2); }
.rl-verdict { margin-left: auto; font-size: 12.5px; color: var(--ink-2); white-space: nowrap; padding-top: 2px; }
.rulelist li.hit .rl-verdict { color: var(--green); font-weight: 600; }

.trace { margin: 0; padding-left: 20px; }
.trace li { font-size: 13.5px; padding: 4px 0; color: var(--ink-2); }
.trace li .tr-t { color: var(--ink); }
.trace li .tr-v { display: block; color: var(--ink-2); }
.trace li.ok::marker { color: var(--green); }
.trace li.no::marker { color: var(--red); }

.det-foot {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--line);
}
.det-meta { font-size: 12.5px; color: var(--ink-3); }
.det-foot .btn { margin-left: auto; }

/* --------------------------------------------------------------- table --- */

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 6px; }
table.dt { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 540px; }
table.dt th {
  text-align: left; font-size: 12px; font-weight: 500; color: var(--ink-3);
  padding: 10px 14px; border-bottom: 1px solid var(--line); background: var(--wash); white-space: nowrap;
}
table.dt td { padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.dt tr:last-child td { border-bottom: 0; }
table.dt tr.is-hit { background: var(--green-wash); }
table.dt tr.is-dim td { color: var(--ink-3); }
.c-pri { width: 56px; color: var(--ink-3); }
.c-meth { width: 180px; }
.c-res { width: 128px; }
.needs { display: flex; flex-wrap: wrap; gap: 5px; align-items: center; }
.need { font-size: 13px; color: var(--ink-2); }
.need.ok { color: var(--green); font-weight: 600; }
.need.miss { color: var(--red); }
.need-plus { color: var(--ink-3); font-size: 12px; }
.rule-note { font-size: 12.5px; color: var(--ink-3); margin-top: 5px; max-width: 54ch; }
.res { font-size: 12.5px; color: var(--ink-3); }
.res.ok { color: var(--green); font-weight: 600; }
.res.low { color: var(--amber); }
.res.no { color: var(--red); }

/* ------------------------------------------------------------- library --- */

.lib-bar { display: flex; gap: 12px; align-items: center; margin-bottom: 22px; flex-wrap: wrap; }
.lib-bar input { max-width: 340px; }
.filters { display: flex; gap: 6px; flex-wrap: wrap; }
.filter {
  appearance: none; font: inherit; font-size: 13.5px; cursor: pointer;
  padding: 8px 14px; border-radius: 999px; border: 1px solid var(--line-2);
  background: var(--paper); color: var(--ink-2);
}
.filter:hover { border-color: var(--ink-3); color: var(--ink); }
.filter[aria-pressed="true"] { background: var(--green); border-color: var(--green); color: #fff; }

.cat { background: var(--paper); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; margin-bottom: 16px; }
.cat-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 14px; flex-wrap: wrap; }
.cat-head h2 { font-size: 16px; }
.cat-meta { font-size: 13px; color: var(--ink-3); margin-left: auto; }
.empty { color: var(--ink-2); padding: 30px 0; }

/* -------------------------------------------------------------- footer --- */

.pagefoot { border-top: 1px solid var(--line); margin-top: 46px; padding: 30px 0 46px; background: var(--paper); }
.foot-lead { font-size: 14px; color: var(--ink-2); max-width: 62ch; }
.foot-lead b { color: var(--ink); font-weight: 600; }
.foot-points { list-style: none; padding: 0; display: flex; gap: 24px; flex-wrap: wrap; margin-top: 16px; }
.foot-points li { font-size: 13.5px; color: var(--ink-2); position: relative; padding-left: 16px; }
.foot-points li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--green);
}
.foot-meta { font-size: 12.5px; color: var(--ink-3); margin-top: 20px; }

/* ---------------------------------------------------------- responsive --- */

@media (max-width: 640px) {
  .intro { padding: 30px 0 20px; }
  .intro h1 { font-size: 23px; }
  .card { padding: 18px; }
  .answer { padding: 26px 18px 22px; }
  .answer-name { font-size: 25px; }
  .details-body, .details > summary { padding-left: 16px; padding-right: 16px; }
  .examples { grid-template-columns: 1fr; }
  .rl-verdict { display: none; }
  .topbar-inner { gap: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important; animation-iteration-count: 1 !important;
    transition-duration: .001ms !important; scroll-behavior: auto !important;
  }
}

/* ----------------------------------------------------- rule provenance --- */

.c-src { width: 190px; }
.src { font-size: 12px; cursor: help; border-bottom: 1px dotted var(--line-2); }
.src.ok { color: var(--ink-2); }
.src.todo { color: var(--amber); }
.src-note { font-size: 12.5px; color: var(--ink-3); margin-top: 12px; max-width: 66ch; }
.src-note code { font-size: 12px; color: var(--ink-2); }

/* ------------------------------------------------------------- evidence --- */

.ev-bar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.ev-bar input { flex: 1 1 320px; height: 44px; font-size: 15px; }
.ev-examples { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-top: 14px; }
.ev-examples > span { font-size: 13px; color: var(--ink-3); }
.ev-eg {
  appearance: none; font: inherit; font-size: 12.5px; cursor: pointer;
  padding: 5px 11px; border-radius: 999px; border: 1px solid var(--line-2);
  background: var(--paper); color: var(--ink-2);
}
.ev-eg:hover { border-color: var(--green); color: var(--green); background: var(--green-wash); }

.ev-results { display: flex; flex-direction: column; gap: 12px; margin-bottom: 18px; }
.ev-hit {
  background: var(--paper); border: 1px solid var(--line);
  border-left: 3px solid var(--green); border-radius: var(--r); padding: 16px 18px;
}
.ev-cite { display: flex; flex-direction: column; gap: 2px; }
.ev-cite b { font-size: 14.5px; }
.ev-cite span { font-size: 12.5px; color: var(--ink-3); }
.ev-warn {
  margin-top: 8px; font-size: 12.5px; font-weight: 500; color: var(--red);
  background: var(--red-wash); border: 1px solid var(--red-line);
  border-radius: 5px; padding: 5px 9px; display: inline-block;
}
.ev-warn.amber { color: var(--amber); background: var(--amber-wash); border-color: var(--amber-line); }
.ev-sec { margin-top: 9px; font-size: 12.5px; color: var(--ink-2); }
.ev-text { margin-top: 10px; font-size: 14px; line-height: 1.65; color: var(--ink-2); }
.ev-text mark { background: var(--green-wash); color: var(--ink); padding: 0 2px; border-radius: 2px; }

.ev-pub { margin-bottom: 18px; }
.ev-pub:last-child { margin-bottom: 0; }
.ev-pub h3 { font-size: 13px; color: var(--ink-3); font-weight: 500; margin-bottom: 8px; }
.ev-pub ul { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.ev-pub li { font-size: 13.5px; display: flex; gap: 10px; flex-wrap: wrap; align-items: baseline; }
.ev-pub li b { font-weight: 500; }
.ev-pub li span { font-size: 12.5px; color: var(--ink-3); }