/* ===================================================
   Ledger — design tokens
   Palette: paper ledger + graph grid + amber ink stamp
=================================================== */
:root {
  --paper:      #F7F5EE;
  --paper-dim:  #EFEBDE;
  --ink:        #1C2321;
  --ink-soft:   #5B6360;
  --line:       #D8D3C4;
  --line-strong:#B9B29C;
  --amber:      #C98A2C;
  --amber-deep: #A8701C;
  --teal:       #2F6F6B;
  --teal-deep:  #1E4C49;
  --danger:     #B3452C;
  --card-bg:    #FFFFFF;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body:    'IBM Plex Sans', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;

  --radius: 3px;
  --shadow-card: 0 1px 0 var(--line), 0 8px 20px -14px rgba(28,35,33,0.35);
}

* { 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;
}

a { color: inherit; text-decoration: none; }

/* Graph paper backdrop — the signature texture */
.grid-backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 40%, transparent 90%);
}

/* ---------------- Topbar ---------------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  border-bottom: 1px solid var(--line);
  background: rgba(247,245,238,0.9);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
}
.brand-mark {
  color: var(--amber);
  font-size: 18px;
}
.topnav { display: flex; align-items: center; gap: 14px; }
.nav-link { font-weight: 500; color: var(--ink-soft); font-size: 14px; }
.nav-link:hover { color: var(--ink); }
.nav-user {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover { background: var(--teal-deep); }
.btn-ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--ink); }
.btn-amber {
  background: var(--amber);
  color: var(--card-bg);
}
.btn-amber:hover { background: var(--amber-deep); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-block { width: 100%; justify-content: center; }
.btn-sm { padding: 6px 12px; font-size: 13px; }

/* ---------------- Layout shells ---------------- */
.main-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 48px 40px 80px;
  min-height: calc(100vh - 140px);
}
.footer {
  display: flex;
  justify-content: space-between;
  padding: 20px 40px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-soft);
  font-family: var(--font-mono);
}
.footer-dim { opacity: 0.6; }

/* ---------------- Flash messages ---------------- */
.flash-stack { margin-bottom: 24px; display: flex; flex-direction: column; gap: 8px; }
.flash {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  border-left: 3px solid var(--ink);
  background: var(--card-bg);
}
.flash-error { border-left-color: var(--danger); color: var(--danger); }
.flash-success { border-left-color: var(--teal); color: var(--teal-deep); }

/* ---------------- Hero (landing) ---------------- */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
  padding: 40px 0 72px;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber-deep);
  margin-bottom: 14px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: 46px;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}
.hero p.lede {
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 0 0 30px;
}
.hero-actions { display: flex; gap: 12px; }

/* Ledger stamp / receipt preview graphic in hero */
.receipt {
  background: var(--card-bg);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  border-radius: var(--radius);
  padding: 22px 24px;
  font-family: var(--font-mono);
  position: relative;
  transform: rotate(-1.2deg);
}
.receipt::before {
  content: "";
  position: absolute;
  top: -10px; left: 20px; right: 20px;
  height: 10px;
  background: repeating-linear-gradient(90deg, var(--paper) 0 6px, transparent 6px 12px);
  border-top: 1px dashed var(--line-strong);
}
.receipt-title {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-bottom: 1px dashed var(--line-strong);
  padding-bottom: 10px;
  margin-bottom: 12px;
}
.receipt-row {
  display: flex;
  justify-content: space-between;
  font-size: 13.5px;
  padding: 5px 0;
}
.receipt-row span:first-child { color: var(--ink-soft); }
.receipt-row span:last-child { font-weight: 600; }
.receipt-total {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--ink);
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  color: var(--teal-deep);
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 12px;
}
.steps-vertical {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.step {
  border-top: 2px solid var(--ink);
  padding-top: 14px;
}
.step-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--amber-deep);
  margin-bottom: 8px;
}
.step h3 { font-family: var(--font-display); font-size: 17px; margin: 0 0 6px; }
.step p { color: var(--ink-soft); font-size: 14px; margin: 0; }

/* ---------------- Auth forms ---------------- */
.auth-shell {
  max-width: 400px;
  margin: 40px auto;
}
.auth-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 36px 32px;
}
.auth-card h1 {
  font-family: var(--font-display);
  font-size: 24px;
  margin: 0 0 6px;
}
.auth-card .sub {
  color: var(--ink-soft);
  font-size: 14px;
  margin: 0 0 26px;
}
.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
}
.field input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 14px;
  background: var(--paper);
}
.field input:focus {
  outline: 2px solid var(--teal);
  outline-offset: 1px;
  border-color: var(--teal);
}
.auth-foot {
  margin-top: 18px;
  font-size: 13px;
  color: var(--ink-soft);
  text-align: center;
}

/* ---------------- Workbench (dashboard) ---------------- */
.workbench {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}
.panel {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 28px;
  margin-bottom: 24px;
}
.panel h2 {
  font-family: var(--font-display);
  font-size: 18px;
  margin: 0 0 4px;
}
.panel .panel-sub { color: var(--ink-soft); font-size: 13px; margin: 0 0 20px; }

.dropzone {
  border: 2px dashed var(--line-strong);
  border-radius: var(--radius);
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--amber);
  background: rgba(201,138,44,0.06);
}
.dropzone-icon { font-size: 28px; color: var(--amber-deep); margin-bottom: 8px; }
.dropzone p { margin: 4px 0; font-size: 14px; color: var(--ink-soft); }
.dropzone .filename-display {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--teal-deep);
}

.selector-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 12px;
}
.check-tile {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  background: var(--paper);
}
.check-tile.checked {
  border-color: var(--teal);
  background: rgba(47,111,107,0.06);
}
.check-tile input { margin-top: 2px; }
.check-tile .tile-name { font-weight: 600; display: block; }
.check-tile .tile-type {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.stat-toggle-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.stat-pill {
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 13px;
  font-family: var(--font-mono);
  cursor: pointer;
  background: var(--paper);
}
.stat-pill.checked {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

/* Result cards */
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 8px;
}
.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.stat-card-head {
  background: var(--ink);
  color: var(--paper);
  padding: 10px 16px;
  font-family: var(--font-display);
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.stat-card-head .col-type {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  color: var(--amber);
  letter-spacing: 0.06em;
}
.stat-card-body { padding: 8px 16px 14px; }
.stat-line {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px dotted var(--line);
  font-size: 13.5px;
}
.stat-line:last-child { border-bottom: none; }
.stat-line .k { color: var(--ink-soft); font-family: var(--font-mono); font-size: 12px; }
.stat-line .v { font-family: var(--font-mono); font-weight: 600; }
.stat-card-chart { padding: 12px 16px 18px; border-top: 1px solid var(--line); }

/* History sidebar */
.history-list { display: flex; flex-direction: column; gap: 10px; }
.history-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-size: 13px;
  background: var(--paper);
}
.history-item a { font-weight: 600; }
.history-item .hist-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
  margin-top: 3px;
}
.empty-note { color: var(--ink-soft); font-size: 13px; }

/* Download bar */
.download-bar {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

/* Loading */
.loader-line {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber-deep);
  display: none;
}
.loader-line.active { display: block; }

/* Responsive */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; }
  .workbench { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .main-shell { padding: 32px 20px 60px; }
  .topbar { padding: 16px 20px; }
}

/* Focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}