/* ============================================================
   FieldSolver — "Reloading Manual"
   A printed ballistics load-data page. One spot color (oxblood),
   tabular figures as the hero, engineered slab + plex type.
   ============================================================ */

:root {
  /* Paper & ink */
  --paper:        #efe9dc;  /* bone stock */
  --paper-sunk:   #e6dfcf;  /* recessed wells, table head */
  --card:         #f6f2e8;  /* raised sheet */
  --ink:          #1a1714;  /* warm near-black */
  --ink-2:        #5b5347;  /* secondary text */
  --ink-3:        #8c8268;  /* captions, muted figures */

  /* The one spot color */
  --oxblood:      #7a2417;
  --oxblood-hi:   #94301f;
  --oxblood-wash: rgba(122, 36, 23, 0.06);

  /* Rules */
  --rule:         rgba(26, 23, 20, 0.16);
  --rule-strong:  rgba(26, 23, 20, 0.34);

  /* Type */
  --font-display: "Zilla Slab", Georgia, "Times New Roman", serif;
  --font-sans:    "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  --maxw: 60rem;
}

/* ---- reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background-color: var(--paper);
  /* faint paper tooth */
  background-image:
    radial-gradient(circle at 15% 8%, rgba(122,36,23,0.018), transparent 60%),
    radial-gradient(circle at 85% 92%, rgba(26,23,20,0.02), transparent 55%);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--oxblood); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
h1, h2, h3 { margin: 0; font-family: var(--font-display); font-weight: 700; }
p { margin: 0; }

/* ---- shared layout ---- */
.page { max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }
.tnum { font-variant-numeric: tabular-nums; font-feature-settings: "tnum" 1; }

/* ============================================================
   MASTHEAD
   ============================================================ */
.masthead {
  border-bottom: 1px solid var(--ink);
  box-shadow: 0 2px 0 var(--oxblood);   /* double-rule under the title */
  margin-bottom: 2.25rem;
}
.masthead__bar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.4rem 0 1.1rem;
  flex-wrap: wrap;
}
.masthead__title {
  font-size: clamp(1.6rem, 4.5vw, 2.4rem);
  letter-spacing: 0.02em;
  line-height: 0.95;
  text-transform: uppercase;
  color: var(--ink);
}
.masthead__title a { color: inherit; }
.masthead__title a:hover { text-decoration: none; color: var(--oxblood); }
.masthead__title .dot { color: var(--oxblood); }
.masthead__meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
  text-align: right;
}
.masthead__meta .sep { color: var(--oxblood); padding: 0 0.35em; }

/* logged-in user controls live in the masthead */
.userline {
  display: flex; align-items: center; gap: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--ink-2);
}
.userline form { margin: 0; }

/* ============================================================
   TYPE FURNITURE
   ============================================================ */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--oxblood);
  margin-bottom: 0.5rem;
}
.page-title {
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  line-height: 1.05;
  letter-spacing: 0.01em;
}
.lede {
  max-width: 46ch;
  color: var(--ink-2);
  font-size: 1rem;
  margin-top: 0.6rem;
}
.pagehead { margin-bottom: 2rem; }
.pagehead--split {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
}

/* ============================================================
   FORM — the load workup spec sheet
   ============================================================ */
.workup { display: grid; gap: 1.75rem; }

.spec {
  border: 1px solid var(--rule);
  background: var(--card);
}
.spec__head {
  display: flex; align-items: baseline; gap: 0.6rem;
  padding: 0.7rem 1.1rem;
  border-bottom: 1px solid var(--rule);
  background: var(--paper-sunk);
}
.spec__no {
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--oxblood); letter-spacing: 0.05em;
}
.spec__title {
  font-family: var(--font-display); font-weight: 700;
  font-size: 0.92rem; letter-spacing: 0.13em; text-transform: uppercase;
  color: var(--ink);
}
.spec__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  background: var(--card);
}
.field {
  background: var(--card);
  padding: 0.85rem 1.1rem 1rem;
  display: flex; flex-direction: column;
  /* hairlines drawn per-field so empty trailing tracks stay paper */
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.field label {
  font-size: 0.72rem; letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--ink-2); font-weight: 500; margin-bottom: 0.4rem;
}
.field .unit { color: var(--ink-3); }

input, select {
  font-family: var(--font-mono);
  font-size: 0.98rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: 0;
  padding: 0.5rem 0.6rem;
  width: 100%;
}
input:hover, select:hover { border-color: var(--ink-2); }
input:focus, select:focus {
  outline: none;
  border-color: var(--oxblood);
  box-shadow: inset 0 -2px 0 var(--oxblood);
}
select { cursor: pointer; }

/* optional atmosphere drawer */
.drawer { border: 1px dashed var(--rule-strong); background: transparent; }
.drawer > summary {
  list-style: none; cursor: pointer; user-select: none;
  padding: 0.7rem 1.1rem;
  font-family: var(--font-display); font-weight: 700;
  font-size: 0.92rem; letter-spacing: 0.13em; text-transform: uppercase;
  color: var(--ink); display: flex; align-items: center; gap: 0.55rem;
}
.drawer > summary::-webkit-details-marker { display: none; }
.drawer > summary::before {
  content: "+"; font-family: var(--font-mono); color: var(--oxblood);
  font-weight: 600; font-size: 1.1em; line-height: 1;
}
.drawer[open] > summary::before { content: "\2212"; } /* minus */
.drawer[open] > summary { border-bottom: 1px solid var(--rule); }
.drawer .spec__grid { border-top: none; }

/* ---- button ---- */
.btn {
  font-family: var(--font-display); font-weight: 700;
  font-size: 0.95rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--paper); background: var(--oxblood);
  border: none; border-radius: 0; cursor: pointer;
  padding: 0.8rem 1.6rem;
  display: inline-flex; align-items: center; gap: 0.6rem;
  transition: background-color 0.15s ease, transform 0.05s ease;
}
.btn:hover { background: var(--oxblood-hi); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--block { width: 100%; justify-content: center; }
.btn .arrow { font-family: var(--font-mono); }

.formfoot { display: flex; align-items: center; gap: 1.2rem; }
.formfoot .note {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-3);
  letter-spacing: 0.03em;
}

/* ============================================================
   RESULTS
   ============================================================ */

/* workup summary header — like the header band of a manual's data page */
.workcard {
  border: 1px solid var(--ink);
  margin-bottom: 1.75rem;
}
.workcard__top {
  display: flex; align-items: baseline; gap: 0.6rem; flex-wrap: wrap;
  padding: 0.7rem 1.1rem;
  background: var(--ink); color: var(--paper);
}
.workcard__label {
  font-family: var(--font-mono); font-size: 0.68rem;
  letter-spacing: 0.22em; text-transform: uppercase; opacity: 0.7;
}
.workcard__quarry {
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.05rem; letter-spacing: 0.1em; text-transform: uppercase;
}
.workcard__dl {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  margin: 0; background: var(--card);
}
.workcard__dl > div {
  background: var(--card); padding: 0.6rem 1.1rem;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.workcard__dl dt {
  font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-2); margin-bottom: 0.15rem;
}
.workcard__dl dd {
  margin: 0; font-family: var(--font-mono); font-variant-numeric: tabular-nums;
  font-size: 0.95rem; color: var(--ink);
}

/* tally badges */
.tally { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.5rem; }
.badge {
  font-family: var(--font-mono); font-size: 0.72rem;
  letter-spacing: 0.04em; text-transform: uppercase;
  padding: 0.3rem 0.65rem; border: 1px solid var(--rule-strong);
}
.badge .n { font-weight: 600; }
.badge--pass { color: var(--ink); border-color: var(--ink); }
.badge--rej  { color: var(--ink-3); border-style: dashed; }
.badge--reason { color: var(--ink-2); border-color: var(--rule); }

/* THE LOAD-DATA TABLE — signature element */
.datawrap { overflow-x: auto; margin-bottom: 2.25rem; }
.datatable {
  width: 100%; border-collapse: collapse; min-width: 38rem;
  font-variant-numeric: tabular-nums;
}
.datatable caption {
  text-align: left;
  font-family: var(--font-mono); font-size: 0.68rem;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--oxblood);
  padding-bottom: 0.55rem;
}
.datatable thead th {
  font-family: var(--font-sans); font-weight: 600;
  font-size: 0.66rem; letter-spacing: 0.09em; text-transform: uppercase;
  color: var(--ink-2);
  text-align: right; padding: 0.45rem 0.9rem 0.5rem;
  border-bottom: 2px solid var(--ink);
  white-space: nowrap;
}
.datatable thead th.col-rank { text-align: center; width: 2.5rem; }
.datatable thead th.col-name { text-align: left; }
.datatable tbody td {
  font-family: var(--font-mono); font-size: 0.92rem;
  text-align: right; padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--rule); color: var(--ink);
  white-space: nowrap;
}
.datatable tbody tr:last-child td { border-bottom: 1px solid var(--ink); }
.datatable .col-rank { text-align: center; color: var(--ink-3); }
.datatable .col-name {
  text-align: left; font-family: var(--font-display);
  font-weight: 600; font-size: 1rem; letter-spacing: 0.03em; color: var(--ink);
  text-transform: uppercase;       /* headstamp */
  white-space: normal;
}
.datatable .col-sub {
  text-align: left; font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--ink-2); letter-spacing: 0.02em;
}

/* recommended row */
.datatable tr.is-top { background: var(--oxblood-wash); }
.datatable tr.is-top .col-rank { color: var(--oxblood); font-weight: 600; }
.datatable tr.is-top .col-name { color: var(--oxblood); }
.rec-tag {
  display: inline-block; vertical-align: middle;
  font-family: var(--font-mono); font-size: 0.58rem; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--paper); background: var(--oxblood);
  padding: 0.12rem 0.45rem; margin-left: 0.55rem;
}

/* row reveal (one-time, gentle) */
.datatable tbody tr { opacity: 0; animation: rowin 0.4s ease forwards; }
@keyframes rowin { to { opacity: 1; } }

/* chart */
.chart-frame {
  border: 1px solid var(--rule); background: var(--card);
  padding: 1.2rem 1.3rem 1.4rem;
}
.chart-frame__title {
  font-family: var(--font-mono); font-size: 0.68rem;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-2);
  margin-bottom: 0.9rem;
}

/* empty state */
.empty {
  border: 1px solid var(--rule-strong); border-left: 3px solid var(--oxblood);
  background: var(--card); padding: 1.6rem 1.5rem;
}
.empty h2 {
  font-size: 1.1rem; letter-spacing: 0.02em; margin-bottom: 0.4rem;
}
.empty p { color: var(--ink-2); font-size: 0.95rem; }
.empty .back { display: inline-block; margin-top: 1rem; font-family: var(--font-mono);
  font-size: 0.78rem; letter-spacing: 0.04em; }

.backlink {
  font-family: var(--font-mono); font-size: 0.78rem;
  letter-spacing: 0.05em; text-transform: uppercase;
}

/* ============================================================
   AUTH
   ============================================================ */
.auth { max-width: 24rem; margin: 3.5rem auto 0; }
.auth__head { text-align: center; margin-bottom: 1.5rem; }
.auth__head .page-title { font-size: 1.7rem; }
.auth__card { border: 1px solid var(--ink); background: var(--card); padding: 1.6rem 1.4rem; }
.auth__card .field { background: transparent; padding: 0 0 1.1rem; }
.auth__card .field:last-of-type { padding-bottom: 1.3rem; }
.auth__alt { text-align: center; margin-top: 1.1rem; font-size: 0.85rem; color: var(--ink-2); }

.alert {
  border: 1px solid var(--oxblood); border-left: 3px solid var(--oxblood);
  background: var(--oxblood-wash); color: var(--oxblood);
  font-size: 0.85rem; padding: 0.65rem 0.9rem; margin-bottom: 1.1rem;
  font-family: var(--font-mono); letter-spacing: 0.02em;
}

/* page footer colophon */
.colophon {
  margin: 3.5rem 0 2rem;
  padding-top: 1rem; border-top: 1px solid var(--rule);
  font-family: var(--font-mono); font-size: 0.68rem;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem;
}

/* ============================================================
   ACCESSIBILITY
   ============================================================ */
:focus-visible { outline: 2px solid var(--oxblood); outline-offset: 2px; }
input:focus-visible, select:focus-visible { outline: none; }

@media (prefers-reduced-motion: reduce) {
  .datatable tbody tr { opacity: 1; animation: none; }
  * { scroll-behavior: auto !important; }
}

@media (max-width: 540px) {
  .page { padding: 0 1rem; }
  .masthead__meta { text-align: left; }
  .pagehead--split { align-items: flex-start; }
}