/* ----------------------------------------------------------------------
   DeltaTrack — production web app
   Government-tool aesthetic: high contrast, narrow palette, no animation.
   Diff/renderer rules are carried over verbatim from the now-retired prototype
   demo so the canonical-JSON renderer (js/renderer.js) styles identically; the layout
   (landing, upload, result) is new.
   ---------------------------------------------------------------------- */

:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-alt: #f0f2f5;
  --border: #d6dbe1;
  --border-strong: #aab2bd;
  --text: #1c1f23;
  --text-dim: #5a626d;
  --accent: #1f4f8b;
  --accent-dim: #e6edf6;
  --added: #1c6e3a;
  --added-bg: #e3f4e9;
  --removed: #a3261c;
  --removed-bg: #fbe4e1;
  --modified: #8a5b00;
  --modified-bg: #fff3d6;
  --moved: #4a3a8a;
  --moved-bg: #ece6fb;
  --shadow: 0 1px 2px rgba(20, 30, 50, 0.08);
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
}

button { font: inherit; cursor: pointer; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.9em; }
a { color: var(--accent); }

/* ---------- App bar ---------- */
.app-bar {
  display: grid;
  grid-template-columns: minmax(220px, auto) 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 10px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.app-bar__brand { display: flex; align-items: center; gap: 10px; }
.app-bar__home { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
.app-bar__logo { color: var(--accent); font-weight: 700; letter-spacing: -1px; }
.app-bar__name { font-weight: 600; }
.app-bar__bill { display: flex; flex-direction: column; min-width: 0; }
.bill-title { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bill-versions { font-size: 12px; color: var(--text-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.app-bar__actions { display: flex; align-items: center; gap: 12px; }

.view-toggle {
  display: inline-flex;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px;
}
.view-toggle[hidden] { display: none; }
.view-toggle__btn {
  background: transparent; border: 0; padding: 4px 10px;
  font-size: 13px; border-radius: 3px; color: var(--text-dim);
}
.view-toggle__btn.is-active { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }

.btn { padding: 6px 12px; border: 1px solid var(--border); background: var(--surface); border-radius: 4px; color: var(--text); }
.btn:hover { border-color: var(--border-strong); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn--primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn--primary:hover { background: #173d6f; border-color: #173d6f; }
.btn--primary:disabled { background: var(--accent); }

/* ---------- Landing ---------- */
.landing { max-width: 980px; margin: 0 auto; padding: 56px 24px 64px; }
.landing__intro { text-align: center; margin-bottom: 40px; }
.landing__title { font-size: 30px; line-height: 1.2; margin: 0 0 14px; }
.landing__lead { font-size: 16px; color: var(--text-dim); max-width: 680px; margin: 0 auto; }

.paths { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 720px) { .paths { grid-template-columns: 1fr; } }

.path-card {
  position: relative;
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 22px 22px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
}
.path-card--active { border-color: var(--accent); }
.path-card--active:hover { box-shadow: 0 4px 16px rgba(31, 79, 139, 0.18); transform: translateY(-1px); }
.path-card--disabled { opacity: 0.7; background: var(--surface-alt); cursor: not-allowed; }

.path-card__badge {
  display: inline-block;
  font-size: 10px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 2px 8px; border-radius: 999px; margin-bottom: 14px;
}
.path-card__badge--ready { background: var(--added-bg); color: var(--added); }
.path-card__badge--soon { background: var(--modified-bg); color: var(--modified); }
.path-card__title { font-size: 20px; margin: 0 0 4px; }
.path-card__tagline { font-weight: 600; color: var(--text); margin: 0 0 10px; }
.path-card__body { font-size: 14px; color: var(--text-dim); margin: 0 0 18px; }
.path-card__cta { font-weight: 600; color: var(--accent); }
.path-card__cta--disabled { color: var(--text-dim); font-weight: 500; }

.landing__sample { text-align: center; color: var(--text-dim); margin-top: 36px; }

/* ---------- Site footer ---------- */
.site-footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 24px 40px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 13px;
  color: var(--text-dim);
}
.site-footer p { margin: 0; line-height: 1.6; }
.site-footer a { color: var(--accent); }

/* ---------- Page shell (compare) ---------- */
.page { max-width: 1080px; margin: 0 auto; padding: 28px 24px 64px; }

/* ---------- Upload panel ---------- */
.upload-panel__title { font-size: 24px; margin: 0 0 10px; }
.upload-panel__lead { color: var(--text-dim); max-width: 720px; margin: 0 0 24px; }

.format-toggle {
  border: 0; margin: 0 0 16px; padding: 0;
  display: flex; align-items: center; gap: 14px;
}
.format-toggle__legend { float: left; font-size: 13px; font-weight: 600; color: var(--text); padding: 0; margin-right: 4px; }
.format-toggle__opt { font-size: 14px; color: var(--text); display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }

.upload-grid { display: grid; grid-template-columns: 1fr auto 1fr; gap: 16px; align-items: stretch; }
@media (max-width: 640px) { .upload-grid { grid-template-columns: 1fr; } .upload-arrow { display: none; } }

.upload-slot {
  border: 1.5px dashed var(--border-strong);
  border-radius: 6px;
  padding: 32px 16px;
  text-align: center;
  background: var(--surface);
  outline: none;
}
.upload-slot:hover, .upload-slot:focus-visible { border-color: var(--accent); background: var(--accent-dim); }
.upload-slot.is-dragover { border-color: var(--accent); background: var(--accent-dim); }
.upload-slot.has-file { border-style: solid; border-color: var(--added); background: var(--added-bg); }
.upload-slot__label { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.upload-slot__hint { font-size: 12px; color: var(--text-dim); }
.upload-slot__name { font-size: 12px; color: var(--added); font-weight: 600; margin-top: 8px; word-break: break-all; }
.upload-arrow { align-self: center; font-size: 24px; color: var(--text-dim); }

.upload-error {
  margin-top: 16px; padding: 10px 14px;
  background: var(--removed-bg); color: var(--removed);
  border: 1px solid #efc4be; border-radius: 4px; font-size: 13px;
}
.upload-success {
  margin-top: 16px; padding: 10px 14px;
  background: var(--added-bg); color: var(--added);
  border: 1px solid #b8dfc4; border-radius: 4px; font-size: 13px;
}
.upload-actions { margin-top: 20px; display: flex; align-items: center; gap: 14px; }
.upload-note { font-size: 12px; color: var(--text-dim); }

/* ---------- Result ---------- */
.result__toolbar {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 10px 0 16px; border-bottom: 1px solid var(--border); margin-bottom: 16px;
}
.result__title { font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-dim); margin: 0; }
.filter-row { font-size: 13px; cursor: pointer; }
.filter-row input { margin-right: 6px; }
.content { }
.content__loading { color: var(--text-dim); padding: 40px 0; }

.summary-bar { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.summary-pill {
  font-size: 12px; padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface);
  display: inline-flex; gap: 6px; align-items: center;
}
.summary-pill__count { font-weight: 700; }
.summary-pill--added .summary-pill__count { color: var(--added); }
.summary-pill--removed .summary-pill__count { color: var(--removed); }
.summary-pill--modified .summary-pill__count { color: var(--modified); }
.summary-pill--moved .summary-pill__count { color: var(--moved); }

.empty-state { padding: 40px 0; color: var(--text-dim); text-align: center; }

/* ---------- Diff marks (shared between views) ---------- */
ins.diff-add { background: var(--added-bg); color: var(--added); text-decoration: none; padding: 1px 2px; border-radius: 2px; }
del.diff-del { background: var(--removed-bg); color: var(--removed); text-decoration: line-through; padding: 1px 2px; border-radius: 2px; }

/* ---------- Per-change view (default) ---------- */
.change-list { display: flex; flex-direction: column; gap: 14px; }
.change-block {
  background: var(--surface); border: 1px solid var(--border);
  border-left-width: 4px; border-radius: 4px; padding: 12px 16px; box-shadow: var(--shadow);
}
.change-block--added { border-left-color: var(--added); }
.change-block--removed { border-left-color: var(--removed); }
.change-block--modified { border-left-color: var(--modified); }
.change-block--moved { border-left-color: var(--moved); }

.change-block__head { font-size: 12px; color: var(--text-dim); margin-bottom: 8px; display: flex; flex-wrap: wrap; gap: 6px; align-items: baseline; }
.change-block__head .loc { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.change-block__head .section-num { font-weight: 700; color: var(--text); }
.change-block__head em { color: var(--text-dim); }

.change-tag { font-size: 10px; font-weight: 700; letter-spacing: 0.05em; padding: 2px 6px; border-radius: 3px; }
.change-tag--added    { background: var(--added-bg);    color: var(--added); }
.change-tag--removed  { background: var(--removed-bg);  color: var(--removed); }
.change-tag--modified { background: var(--modified-bg); color: var(--modified); }
.change-tag--moved    { background: var(--moved-bg);    color: var(--moved); }

.change-block__body { font-size: 14px; line-height: 1.65; white-space: pre-wrap; word-wrap: break-word; }
.change-block__body .muted { color: var(--text-dim); }

.move-callout { font-size: 12px; color: var(--moved); background: var(--moved-bg); border-radius: 3px; padding: 4px 8px; margin: 0 0 8px; }

.amounts { margin-top: 10px; font-size: 12px; border-top: 1px solid var(--border); padding-top: 8px; }
.amounts__title { font-weight: 600; color: var(--text-dim); font-size: 11px; letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 4px; }
.amount-row { display: flex; gap: 8px; align-items: baseline; }
.amount-row__old { color: var(--removed); text-decoration: line-through; }
.amount-row__arrow { color: var(--text-dim); }
.amount-row__new { color: var(--added); font-weight: 600; }
.amount-row__delta { color: var(--text-dim); font-size: 11px; margin-left: 6px; }

/* ---------- Full-bill tracked-changes view ---------- */
.full-bill-meta { font-size: 11px; color: var(--text-dim); margin-bottom: 10px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.full-bill {
  background: var(--surface); border: 1px solid var(--border); border-radius: 4px;
  padding: 24px 28px; font-size: 13px; line-height: 1.55;
  font-family: ui-monospace, "SF Mono", Menlo, "Cascadia Mono", Consolas, monospace;
  max-width: 920px; box-shadow: var(--shadow);
  white-space: pre-wrap; word-wrap: break-word; tab-size: 4;
}
.moved-mark { background: var(--moved-bg); color: var(--moved); border-radius: 2px; padding: 1px 2px; border-bottom: 1px dashed var(--moved); }

.removed-appendix {
  margin-top: 24px; padding: 16px 20px; background: var(--surface);
  border: 1px solid var(--border); border-left: 4px solid var(--removed);
  border-radius: 4px; max-width: 920px; box-shadow: var(--shadow);
}
.removed-appendix__title { margin: 0 0 4px; font-size: 14px; color: var(--removed); }
.removed-appendix__note { margin: 0 0 12px; font-size: 12px; color: var(--text-dim); }
.removed-block { margin-top: 10px; font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 13px; line-height: 1.55; }
.removed-block__head { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-size: 11px; color: var(--text-dim); margin-bottom: 4px; letter-spacing: 0.04em; text-transform: uppercase; }
.removed-block del.diff-del { white-space: pre-wrap; display: block; padding: 8px 10px; }