/* ---------------------------------------------------------------------
   Tokens
   Palette: ink navy + blueprint gray-blue paper + brass accent + a
   contour-line green for "matched/good" states. Deliberately not the
   cream+terracotta or near-black+neon looks — this is meant to read like
   a surveyor's field ledger, not a generic SaaS gradient page.
------------------------------------------------------------------------ */
:root {
  --ink: #16233f;
  --ink-soft: #3c4d6e;
  --paper: #eef1f6;
  --paper-raised: #ffffff;
  --line: #cdd6e4;
  --line-soft: #e2e7f0;
  --brass: #b96f24;
  --brass-dark: #8f551b;
  --moss: #2f6b4f;
  --moss-bg: #e6f0ea;
  --rust: #a33b2d;
  --rust-bg: #f7e7e3;

  --font-display: "Newsreader", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
}

body {
  min-height: 100vh;
  position: relative;
}

@media (prefers-reduced-motion: no-preference) {
  .primary-btn, .export-btn, .unit-btn, .layer-card, .dropzone { transition: all 0.15s ease; }
}

/* Subtle contour-line texture behind the whole page, evoking topographic
   survey sheets. Pure decoration, kept faint. */
.survey-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    repeating-radial-gradient(circle at 12% 8%, transparent 0, transparent 38px, rgba(22,35,63,0.035) 39px, transparent 40px),
    repeating-radial-gradient(circle at 92% 82%, transparent 0, transparent 52px, rgba(22,35,63,0.03) 53px, transparent 54px);
  background-color: var(--paper);
}

/* ---------------------------------------------------------------------
   Header
------------------------------------------------------------------------ */
.topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(238,241,246,0.9);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { color: var(--brass); flex-shrink: 0; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 21px;
  letter-spacing: 0.01em;
}
.brand-tag {
  font-size: 12.5px;
  color: var(--ink-soft);
  margin-top: 1px;
}
.topbar-note {
  font-size: 12px;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  text-align: right;
  max-width: 220px;
}

/* ---------------------------------------------------------------------
   Layout
------------------------------------------------------------------------ */
.sheet {
  max-width: 920px;
  margin: 0 auto;
  padding: 36px 24px 60px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.panel {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}
.panel-head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  margin: 0 0 3px;
}
.panel-head p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13.5px;
}
.step-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--brass);
  border: 1px solid var(--brass);
  border-radius: 5px;
  padding: 2px 7px;
  flex-shrink: 0;
  margin-top: 2px;
}
#panel-results .panel-head {
  align-items: center;
  flex-wrap: wrap;
}
#panel-results .panel-head > div { flex: 1; }

/* ---------------------------------------------------------------------
   Base layer selection cards
------------------------------------------------------------------------ */
.layer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}
.layer-skeleton {
  height: 84px;
  border-radius: var(--radius);
  background: linear-gradient(90deg, var(--line-soft) 25%, #eceff4 37%, var(--line-soft) 63%);
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
}
@keyframes shimmer { from { background-position: 100% 0; } to { background-position: 0 0; } }

.layer-card {
  border: 1px solid var(--line);
  border-left: 4px solid var(--card-color, var(--brass));
  border-radius: var(--radius);
  padding: 13px 14px;
  cursor: pointer;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--paper-raised);
}
.layer-card:hover { border-color: var(--ink-soft); }
.layer-card.is-selected {
  background: #faf8f3;
  box-shadow: inset 0 0 0 1px var(--card-color, var(--brass));
}
.layer-card.is-unavailable { opacity: 0.5; cursor: not-allowed; }
.layer-card input[type="checkbox"] { margin-top: 3px; accent-color: var(--brass); }
.layer-card-title { font-weight: 600; font-size: 14px; }
.layer-card-desc { font-size: 12.5px; color: var(--ink-soft); margin-top: 2px; }
.layer-card-flag { font-size: 11px; color: var(--rust); margin-top: 4px; font-family: var(--font-mono); }

/* ---------------------------------------------------------------------
   Unit toggle
------------------------------------------------------------------------ */
.unit-toggle { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.unit-btn {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 9px 16px;
  border: none;
  background: var(--paper-raised);
  color: var(--ink-soft);
  cursor: pointer;
  border-right: 1px solid var(--line);
}
.unit-btn:last-child { border-right: none; }
.unit-btn.is-active { background: var(--ink); color: #fff; }

/* ---------------------------------------------------------------------
   Upload
------------------------------------------------------------------------ */
.dropzone {
  border: 1.5px dashed var(--line);
  border-radius: var(--radius);
  padding: 30px 20px;
  text-align: center;
  cursor: pointer;
  color: var(--ink-soft);
}
.dropzone:hover, .dropzone:focus-visible { border-color: var(--brass); color: var(--ink); outline: none; }
.dropzone.is-dragover { border-color: var(--brass); background: #fbf5ec; }
.dropzone svg { color: var(--brass); margin-bottom: 8px; }
.dropzone-text { font-size: 14px; }
.dropzone-text strong { color: var(--ink); }
.dropzone-file {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--moss);
}

.layer-choice { margin-top: 16px; padding: 14px; background: var(--paper); border-radius: 8px; }
.layer-choice p { margin: 0 0 8px; font-size: 13.5px; }
.layer-choice select {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  background: #fff;
}

.primary-btn {
  margin-top: 18px;
  background: var(--ink);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.primary-btn:disabled { background: var(--line); color: var(--ink-soft); cursor: not-allowed; }
.primary-btn:not(:disabled):hover { background: var(--brass-dark); }
.btn-spinner {
  width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

.status-line { margin-top: 12px; font-size: 13.5px; }
.status-line.is-error {
  color: var(--rust);
  background: var(--rust-bg);
  padding: 10px 13px;
  border-radius: 8px;
  white-space: pre-line;
}
.status-line.is-good { color: var(--moss); }

/* ---------------------------------------------------------------------
   Results
------------------------------------------------------------------------ */
.export-row { display: flex; align-items: center; gap: 6px; }
.export-label { font-size: 12px; color: var(--ink-soft); font-family: var(--font-mono); margin-right: 2px; }
.export-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  border: 1px solid var(--line);
  background: var(--paper-raised);
  border-radius: 6px;
  padding: 6px 11px;
  cursor: pointer;
  color: var(--ink);
}
.export-btn:hover { border-color: var(--brass); color: var(--brass-dark); }

.result-table-wrap { margin-top: 22px; }
.result-table-wrap:first-child { margin-top: 0; }
.result-table-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 8px;
  padding-left: 12px;
  border-left: 4px solid var(--tbl-color, var(--brass));
}
.result-table-head h3 { font-family: var(--font-display); font-size: 16px; font-weight: 600; margin: 0; }
.result-table-head .rt-total { font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-soft); }

table.ledger { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.ledger th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  padding: 6px 10px;
  border-bottom: 1px solid var(--ink);
}
table.ledger th.num, table.ledger td.num { text-align: right; }
table.ledger td { padding: 8px 10px; border-bottom: 1px solid var(--line-soft); font-family: var(--font-mono); }
table.ledger td.cat-name { font-family: var(--font-body); }
table.ledger tr:last-child td { border-bottom: 1px solid var(--line); }
.bar-cell { display: flex; align-items: center; gap: 8px; }
.bar-track { flex: 1; height: 6px; background: var(--line-soft); border-radius: 3px; overflow: hidden; min-width: 40px; }
.bar-fill { height: 100%; background: var(--tbl-color, var(--brass)); border-radius: 3px; }
.zero-row td { color: var(--ink-soft); opacity: 0.65; }

.page-footer {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px 50px;
  font-size: 12px;
  color: var(--ink-soft);
  text-align: center;
}

@media (max-width: 620px) {
  .sheet { padding: 24px 14px 40px; }
  .panel { padding: 20px 18px; }
  .topbar-inner { padding: 14px 18px; }
  .topbar-note { display: none; }
}