:root {
  --bg: #0f1419;
  --panel: #161b22;
  --border: #262d36;
  --text: #e6edf3;
  --muted: #8a96a3;
  --accent: #4f8cff;
  --accent-hover: #6ba0ff;
  --good: #3fb950;
  --bad: #f85149;
  --radius: 10px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
header .brand { font-weight: 600; font-size: 16px; text-decoration: none; color: var(--text); }
header nav a { margin-left: 20px; color: var(--muted); text-decoration: none; }
header nav a:hover { color: var(--text); }

main { max-width: 1100px; margin: 32px auto; padding: 0 32px; }

h1 { margin: 0 0 16px; font-size: 24px; font-weight: 600; }
h2 { margin: 32px 0 12px; font-size: 17px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }

.muted { color: var(--muted); }
.small { font-size: 13px; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
.strong { font-weight: 600; }
.neg { color: var(--good); }   /* credits show green */
.empty { padding: 48px; text-align: center; color: var(--muted); border: 1px dashed var(--border); border-radius: var(--radius); }

/* Buttons */
.btn {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  text-decoration: none;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: white; }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.ghost { background: transparent; }

/* Hero / lists */
.hero { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }

table { width: 100%; border-collapse: collapse; }
thead th {
  text-align: left;
  padding: 10px 12px;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}
tbody td { padding: 10px 12px; border-bottom: 1px solid var(--border); }
tbody tr:hover { background: rgba(255,255,255,0.02); }
tbody form { margin: 0; display: inline; }

.bills tbody td a { color: var(--accent); text-decoration: none; }
.bills tbody td a.pdf-link { color: var(--muted); font-size: 13px; }
.bills tbody td a.pdf-link:hover { color: var(--text); text-decoration: underline; }
.bills tbody td a:hover { text-decoration: underline; }
.lines .group-row { background: rgba(79,140,255,0.06); font-weight: 500; }

/* Bill detail */
.bill-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 24px; }
.totals { text-align: right; }
.totals .big { font-size: 32px; font-weight: 700; }

.split-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 32px; }
.split-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.split-card .house-id { font-size: 12px; color: var(--muted); font-weight: 600; }
.split-card .house-label { font-size: 16px; font-weight: 600; margin-top: 4px; }
.split-card .house-amount { font-size: 28px; font-weight: 700; margin: 12px 0 4px; color: var(--accent); }
.split-card .members { list-style: none; padding: 0; margin: 12px 0 0; font-size: 13px; color: var(--muted); border-top: 1px solid var(--border); }
.split-card .members li { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px solid var(--border); }
.split-card .members li:last-child { border-bottom: none; }
.split-card .members .num { color: var(--text); font-variant-numeric: tabular-nums; }

.card-totals { margin: 8px 0 12px; padding: 8px 0 0; border-top: 1px solid var(--border); font-size: 13px; }
.card-totals div { display: flex; justify-content: space-between; padding: 3px 0; color: var(--muted); }
.card-totals dt { margin: 0; }
.card-totals dd { margin: 0; font-variant-numeric: tabular-nums; color: var(--text); }
.card-totals .grand { padding-top: 6px; margin-top: 4px; border-top: 1px solid var(--border); font-weight: 600; font-size: 14px; color: var(--text); }
.card-totals .grand dt, .card-totals .grand dd { color: var(--text); }

.line-picker { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.line-picker label { color: var(--muted); white-space: nowrap; }
.line-picker select { max-width: 420px; }

.line-detail {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 20px; max-width: 520px;
}
.ld-row { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px solid var(--border); font-size: 14px; }
.ld-row:last-child { border-bottom: none; }
.ld-row .num { font-variant-numeric: tabular-nums; }
.ld-row.neg .num { color: var(--good); }
.ld-row.grand { padding-top: 10px; margin-top: 6px; border-top: 2px solid var(--border); font-weight: 600; font-size: 16px; }
.ld-row.grand .num { color: var(--accent); }
.split-card .copy-btn { width: 100%; margin-top: 8px; }

/* Paid state */
.split-card.paid {
  border-color: var(--good);
  background: rgba(63,185,80,0.05);
}
.split-card.paid .house-amount { color: var(--good); }

.card-top-row { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 4px; }

.pay-toggle {
  padding: 5px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.pay-toggle:hover { border-color: var(--good); color: var(--good); }
.pay-toggle.is-paid { background: var(--good); border-color: var(--good); color: #000; font-weight: 600; }

/* Dashboard */
.dashboard { margin-bottom: 32px; }
.chart-wrap { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; max-height: 280px; }

.actions { margin-top: 24px; display: flex; gap: 8px; }

/* Status badges */
.status-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.status-badge.processed { background: rgba(63,185,80,0.15); color: var(--good); }
.status-badge.uploaded  { background: rgba(79,140,255,0.15); color: var(--accent); }
.status-badge.error     { background: rgba(248,81,73,0.15);  color: var(--bad); }

/* Error box */
.error-box {
  background: rgba(248,81,73,0.08);
  border: 1px solid var(--bad);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 16px;
  font-size: 14px;
  color: var(--bad);
}

/* Upload */
.upload-form { display: flex; flex-direction: column; gap: 16px; max-width: 480px; }
.dropzone {
  display: block;
  padding: 48px 24px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  color: var(--muted);
  background: var(--panel);
  transition: border-color 0.15s, color 0.15s;
}
.dropzone:hover, .dropzone.drag-over { border-color: var(--accent); color: var(--text); }
.dropzone.has-file { border-color: var(--good); color: var(--text); }

/* Progress bar */
.progress-bar-track {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.2s ease;
}
.progress-label { margin-top: 6px; }
.dropzone input { display: none; }

/* AI panel */
.ai-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 32px;
  min-height: 60px;
}
.ai-content {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
  white-space: pre-wrap;
}
.ai-spinner {
  color: var(--muted);
  font-size: 14px;
}
.ai-dots::after {
  content: '';
  animation: dots 1.2s steps(4, end) infinite;
}
@keyframes dots {
  0%   { content: ''; }
  25%  { content: '.'; }
  50%  { content: '..'; }
  75%  { content: '...'; }
}
.dashboard-ai { margin-bottom: 8px; }

/* Duplicate card */
.duplicate-card {
  background: rgba(248,81,73,0.06);
  border: 1px solid var(--bad);
  border-radius: var(--radius);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.dup-title { font-weight: 600; color: var(--bad); font-size: 15px; }
.dup-body { display: flex; flex-direction: column; gap: 6px; font-size: 14px; }
.dup-body div { display: flex; gap: 8px; }
.dup-label { color: var(--muted); min-width: 80px; }


/* Login */
.login-wrap { max-width: 360px; margin: 80px auto; }
.login-form { display: flex; flex-direction: column; gap: 16px; margin-top: 24px; }
.login-label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: var(--muted); }
.login-label input { margin-top: 2px; }
header nav button:hover { color: var(--text); }

/* Forms (settings) */
input, select {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 6px;
  font: inherit;
  width: 100%;
}
input:focus, select:focus { outline: none; border-color: var(--accent); }
code { background: var(--panel); padding: 2px 6px; border-radius: 4px; font-size: 12px; }