/* ─── LEDGER PRECISION — InvoiceFlow Design System ─────────────────────────
   Typefaces : IBM Plex Mono (display / UI) + Inter (body copy)
   Philosophy: precision over friendliness — the aesthetic of the ledger book
   ────────────────────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Inter:wght@400;500;600&display=swap');

/* ─── Tokens ──────────────────────────────────────────────────────────────── */
:root {
  /* Palette */
  --paper:     #F7F6F1;   /* off-white parchment — page background */
  --surface:   #FFFFFF;   /* card / modal surface */
  --ledger:    #192919;   /* deep forest green — sidebar / wordmark */
  --ledger-h:  #0F1A0F;   /* deeper green on hover */
  --accent:    #2A6040;   /* forest green — primary actions */
  --accent-h:  #1E4A30;   /* darker accent on hover */
  --ink:       #151512;   /* warm near-black body text */
  --ink-mid:   #4A4A40;   /* medium prose / secondary text */
  --ink-soft:  #8A8A7A;   /* de-emphasized labels */
  --border:    #DDDDD0;   /* ruled lines */

  /* Semantic colors */
  --amber:     #8B6914;
  --amber-bg:  #FDF3DC;
  --amber-br:  #E0C070;
  --red:       #B22828;
  --red-bg:    #FCEAEA;
  --red-br:    #E0AAAA;
  --green:     #2A6040;
  --green-bg:  #EAF5EE;
  --green-br:  #A0CEB0;
  --blue:      #1D4ED8;
  --blue-bg:   #EFF6FF;
  --blue-br:   #BFDBFE;

  /* Shape */
  --radius:    4px;
  --radius-lg: 6px;
  --shadow:    0 1px 2px rgba(0,0,0,.05), 0 3px 12px rgba(0,0,0,.05);
  --shadow-lg: 0 16px 48px rgba(0,0,0,.2);

  /* Type */
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --font-body: 'Inter', system-ui, sans-serif;
}

/* ─── Motion preference ───────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

/* ─── Reset ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ─── Auth screens ────────────────────────────────────────────────────────── */
.auth-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
  background: var(--paper);
}
.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 44px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
}
.auth-logo {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ledger);
  margin-bottom: 6px;
}
.auth-logo span { color: var(--ink-soft); }
.auth-sub        { color: var(--ink-mid); font-size: 13px; margin-bottom: 32px; }
.auth-card h2 {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -.01em;
  margin-bottom: 24px;
}
.auth-switch     { text-align: center; margin-top: 20px; font-size: 13px; color: var(--ink-mid); }
.auth-switch a   { color: var(--accent); text-decoration: none; font-weight: 600; }
.auth-switch a:hover { text-decoration: underline; }
.demo-box {
  margin: 20px 0;
  padding: 14px 16px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-mid);
  line-height: 1.8;
}

/* ─── App shell ───────────────────────────────────────────────────────────── */
.app { display: grid; grid-template-columns: 232px 1fr; min-height: 100vh; }

/* ─── Sidebar ─────────────────────────────────────────────────────────────── */
.sidebar {
  background: var(--ledger);
  padding: 24px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.sidebar-logo {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: #FFFFFF;
  margin-bottom: 32px;
  padding: 0 10px;
  line-height: 1.4;
}
.sidebar-logo span { color: rgba(255,255,255,.38); }

.nav-section-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255,255,255,.28);
  padding: 16px 10px 4px;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius);
  text-decoration: none;
  color: rgba(255,255,255,.6);
  font-size: 13px;
  font-weight: 500;
  transition: background-color .15s, color .15s;
}
.nav-link:hover  { background: rgba(255,255,255,.08); color: #FFFFFF; }
.nav-link.active { background: rgba(255,255,255,.14); color: #FFFFFF; }
.nav-link:focus-visible {
  outline: 2px solid rgba(255,255,255,.55);
  outline-offset: 1px;
}
.nav-link .icon { font-size: 14px; width: 20px; text-align: center; flex-shrink: 0; }
.nav-spacer     { flex: 1; }
.nav-user {
  padding: 12px;
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  margin-top: 8px;
}
.nav-user-name {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: #FFFFFF;
}
.nav-user-role {
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(255,255,255,.4);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-top: 2px;
}

/* ─── Main content ────────────────────────────────────────────────────────── */
.main           { padding: 36px 40px; overflow-y: auto; }
.page-header    { margin-bottom: 28px; }
.page-header h1 {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--ink);
}
.page-header p { color: var(--ink-mid); font-size: 13px; margin-top: 4px; }

/* ─── Stats row ───────────────────────────────────────────────────────────── */
.stats-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 28px; }
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.stat-value {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -.02em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--ink-soft);
  margin-top: 5px;
  text-transform: uppercase;
  letter-spacing: .1em;
}
.stat-card.accent .stat-value { color: var(--accent); }
.stat-card.green  .stat-value { color: var(--green);  }
.stat-card.red    .stat-value { color: var(--red);    }
.stat-card.amber  .stat-value { color: var(--amber);  }
.stat-card.blue   .stat-value { color: var(--blue);   }

/* ─── Cards & tables ─────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card-header {
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  background: var(--paper);
}
.card-header h3 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--ink-soft);
}
.table-wrap { overflow-x: auto; }
table       { width: 100%; border-collapse: collapse; }
th {
  padding: 10px 16px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: .1em;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  background: var(--paper);
  user-select: none;
}
th[onclick]           { cursor: pointer; }
th[onclick]:hover     { color: var(--accent); }
th[onclick]:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  vertical-align: middle;
}
tr:last-child td { border-bottom: none; }
/* Ledger alternating rows */
tbody tr:nth-child(even) td { background: #FAFAF7; }
tbody tr:hover td { background: rgba(42,96,64,.05) !important; }

/* ─── Forms ──────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 18px; }
label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .09em;
  margin-bottom: 6px;
  color: var(--ink-mid);
}
input[type=text],
input[type=email],
input[type=password],
input[type=number],
input[type=date],
input[type=file],
select,
textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--ink);
  background: var(--surface);
  transition: border-color .15s, box-shadow .15s;
  outline: none;
  font-family: var(--font-body);
}
input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(42,96,64,.12);
}
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(42,96,64,.12);
}
input[type=file] { padding: 8px; cursor: pointer; font-family: var(--font-mono); font-size: 11px; }
textarea         { resize: vertical; min-height: 80px; }
.form-hint       { font-size: 12px; color: var(--ink-soft); margin-top: 4px; }
.form-hint a     { color: var(--accent); text-decoration: none; }
.form-hint a:hover { text-decoration: underline; }
.two-col         { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ─── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .07em;
  text-transform: uppercase;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  transition: background-color .15s, border-color .15s, color .15s;
  line-height: 1;
  white-space: nowrap;
}
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-primary        { background: var(--accent);   color: #fff; border-color: var(--accent); }
.btn-primary:hover  { background: var(--accent-h); border-color: var(--accent-h); }
.btn-outline        { background: transparent; color: var(--accent); border-color: var(--border); }
.btn-outline:hover  { border-color: var(--accent); background: rgba(42,96,64,.06); }
.btn-danger         { background: var(--red-bg); color: var(--red); border-color: var(--red-br); }
.btn-danger:hover   { background: #f5d8d8; }
.btn-green          { background: var(--green-bg); color: var(--green); border-color: var(--green-br); }
.btn-green:hover    { background: #d5ecdf; }
.btn-red            { background: var(--red-bg);  color: var(--red);   border-color: var(--red-br); }
.btn-red:hover      { background: #f5d8d8; }
.btn-sm             { padding: 5px 10px; font-size: 10px; }

/* ─── Badges ─────────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 7px;
  border-radius: var(--radius);   /* square, not pills */
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  border: 1px solid;
}
.badge-pending  { background: var(--amber-bg); color: var(--amber); border-color: var(--amber-br); }
.badge-approved { background: var(--green-bg); color: var(--green); border-color: var(--green-br); }
.badge-declined { background: var(--red-bg);   color: var(--red);   border-color: var(--red-br);   }
.badge-paid     { background: var(--blue-bg);  color: var(--blue);  border-color: var(--blue-br);  }

/* ─── Role badges ────────────────────────────────────────────────────────── */
.badge-role-admin  { background: #F5F0FF; color: #6D28D9; border-color: #C4B5FD; border-radius: var(--radius); font-family: var(--font-mono); font-size: 10px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; border-width: 1px; border-style: solid; padding: 2px 7px; display: inline-block; }
.badge-role-ap-mgr { background: var(--blue-bg);  color: var(--blue);  border-color: var(--blue-br);  border-radius: var(--radius); font-family: var(--font-mono); font-size: 10px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; border-width: 1px; border-style: solid; padding: 2px 7px; display: inline-block; }
.badge-role-ap     { background: var(--green-bg); color: var(--green); border-color: var(--green-br); border-radius: var(--radius); font-family: var(--font-mono); font-size: 10px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; border-width: 1px; border-style: solid; padding: 2px 7px; display: inline-block; }
.badge-role-user   { background: var(--paper); color: var(--ink-mid); border-color: var(--border);    border-radius: var(--radius); font-family: var(--font-mono); font-size: 10px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; border-width: 1px; border-style: solid; padding: 2px 7px; display: inline-block; }

/* ─── Alert messages ─────────────────────────────────────────────────────── */
.alert {
  padding: 11px 16px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 24px;
  border: 1px solid;
}
.alert-success { background: var(--green-bg); color: var(--green); border-color: var(--green-br); }
.alert-error   { background: var(--red-bg);   color: var(--red);   border-color: var(--red-br);   }

/* ─── Upload zone ────────────────────────────────────────────────────────── */
.upload-zone {
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background-color .15s;
  background: var(--paper);
}
.upload-zone:hover,
.upload-zone.drag {
  border-color: var(--accent);
  background: rgba(42,96,64,.04);
}
.upload-zone:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.upload-zone .uz-icon { font-size: 28px; margin-bottom: 10px; }
.upload-zone p        { color: var(--ink-mid); font-size: 13px; }
.upload-zone small    { color: var(--ink-soft); font-size: 11px; font-family: var(--font-mono); letter-spacing: .04em; }

/* ─── Filter tabs ────────────────────────────────────────────────────────── */
.filter-tabs { display: flex; gap: 0; }
.filter-tab {
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
  transition: color .15s;
  border-bottom: 2px solid transparent;
}
.filter-tab:hover  { color: var(--accent); }
.filter-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.filter-tab:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* ─── Modal ──────────────────────────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(21,21,18,.52);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}
.modal h3 {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: -.01em;
}
.modal-actions { display: flex; gap: 10px; margin-top: 24px; justify-content: flex-end; }
.modal-wide    { max-width: 860px; }

/* ─── Empty state ────────────────────────────────────────────────────────── */
.empty      { padding: 60px 20px; text-align: center; color: var(--ink-soft); }
.empty-icon { font-size: 32px; margin-bottom: 12px; }
.empty p    { font-family: var(--font-mono); font-size: 12px; letter-spacing: .04em; }

/* ─── Misc helpers ───────────────────────────────────────────────────────── */
.file-name  { display: flex; align-items: center; gap: 6px; }
.amount-col {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.text-soft { color: var(--ink-soft); font-size: 12px; }

/* ─── Preview link ───────────────────────────────────────────────────────── */
.preview-link       { color: var(--accent); text-decoration: none; font-weight: 500; }
.preview-link:hover { text-decoration: underline; }
.preview-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

/* ─── Form section title ─────────────────────────────────────────────────── */
.form-section-title {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--ink-soft);
  margin: 28px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* ─── Required asterisk ──────────────────────────────────────────────────── */
.required { color: var(--red); margin-left: 2px; }

/* ─── Due date colour coding ─────────────────────────────────────────────── */
.due-date        { font-family: var(--font-mono); font-size: 12px; font-weight: 500; white-space: nowrap; }
.due-date small  { font-weight: 400; font-size: 10px; opacity: .75; display: block; margin-top: 1px; }
.due-black { color: var(--ink); }
.due-yellow { color: var(--amber); background: var(--amber-bg); padding: 2px 6px; border-radius: var(--radius); }
.due-red    { color: var(--red);   background: var(--red-bg);   padding: 2px 6px; border-radius: var(--radius); }

/* ─── Sort icons ─────────────────────────────────────────────────────────── */
.sort-icon { opacity: .35; margin-left: 4px; }
th.sort-asc  .sort-icon,
th.sort-desc .sort-icon { opacity: 1; color: var(--accent); }

/* ─── Paid stat card ──────────────────────────────────────────────────────── */
.stat-card.blue .stat-value { color: var(--blue); }

/* ─── Inline bar chart ───────────────────────────────────────────────────── */
.bar-chart { display: flex; align-items: flex-end; gap: 12px; height: 160px; }

/* ─── Two/three column layout helpers ───────────────────────────────────── */
.three-col { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  .app       { grid-template-columns: 1fr; }
  .sidebar   { display: none; }
  .main      { padding: 20px 16px; }
  .two-col   { grid-template-columns: 1fr; }
  .three-col { grid-template-columns: 1fr; }
}