:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #162033;
  --muted: #6d7890;
  --border: #e5e9f2;
  --primary: #3b82f6;
  --primary-2: #2563eb;
  --chip: #eef3ff;
  --danger: #dc2626;
  --success: #16a34a;
  --shadow: 0 10px 30px rgba(20, 30, 60, 0.08);
}
body.dark {
  --bg: #0d1220;
  --card: #141b2d;
  --text: #eef2ff;
  --muted: #9aa5c1;
  --border: #27314a;
  --primary: #60a5fa;
  --primary-2: #3b82f6;
  --chip: #1a2440;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.page { max-width: 1400px; margin: 0 auto; padding: 20px; }
.grid { display: grid; gap: 18px; }
.top-grid { grid-template-columns: 1.15fr 1fr; }
.main-grid { grid-template-columns: 1.5fr 0.75fr; align-items: start; }
.bottom-grid { grid-template-columns: 1fr 1fr; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 22px;
  box-shadow: var(--shadow);
}
.hero { display: flex; justify-content: space-between; gap: 16px; align-items: start; margin-bottom: 18px; }
.eyebrow { color: var(--primary); font-weight: 700; font-size: 12px; text-transform: uppercase; letter-spacing: 0.12em; }
h1, h2, h3 { margin: 0 0 10px; }
h1 { font-size: 34px; }
h2 { font-size: 18px; }
p, .help, .muted { color: var(--muted); }
.help { margin-bottom: 14px; font-size: 13px; }
label { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 600; }
input, textarea, select {
  width: 100%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 12px 14px;
  border-radius: 14px;
  outline: none;
  font-size: 14px;
}
textarea { resize: vertical; }
input:focus, textarea:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,.12); }
.btn {
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  font-weight: 700;
  cursor: pointer;
  transition: .18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: white; }
.btn-secondary { background: var(--chip); color: var(--text); border: 1px solid var(--border); }
.file-btn input { display: none; }
.upload-row, .row-actions, .add-person-row, .section-title-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.section-title-row { justify-content: space-between; }
.form-grid { display: grid; gap: 14px; grid-template-columns: repeat(2, minmax(0,1fr)); }
.preview-wrap { margin-top: 14px; min-height: 220px; border: 1px dashed var(--border); border-radius: 18px; display: grid; place-items: center; overflow: hidden; background: rgba(127,127,127,.03); }
.preview-wrap img { max-width: 100%; max-height: 360px; display: none; }
.status { margin-top: 12px; }
.items-list { display: flex; flex-direction: column; gap: 14px; }
.item-card {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 14px;
  background: rgba(127,127,127,.03);
}
.item-top { display: grid; grid-template-columns: 2fr .7fr 1fr auto; gap: 10px; align-items: end; }
.people-picker { margin-top: 12px; }
.people-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 999px;
  padding: 8px 12px;
  display: inline-flex;
  gap: 8px;
  align-items: center;
  cursor: pointer;
  user-select: none;
}
.pill.active { background: var(--chip); border-color: var(--primary); }
.pill input { width: auto; margin: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.chip {
  padding: 10px 12px;
  background: var(--chip);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.chip button, .icon-btn { border: 0; background: transparent; color: var(--danger); cursor: pointer; font-size: 18px; }
.results { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }
.result-card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 12px 14px;
  background: rgba(127,127,127,.03);
}
.totals-box { margin-top: 14px; border-top: 1px solid var(--border); padding-top: 14px; }
.totals-box > div, .export-total-row { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.grand-line, .export-total-row { font-size: 18px; font-weight: 800; }
.bill-card-export { border: 1px solid var(--border); border-radius: 22px; padding: 18px; background: linear-gradient(180deg, rgba(59,130,246,.08), transparent 40%), var(--card); }
.bill-head { display: flex; justify-content: space-between; align-items: start; gap: 16px; margin-bottom: 14px; }
.badge { background: var(--chip); border: 1px solid var(--border); padding: 8px 12px; border-radius: 999px; font-weight: 800; }
.export-line { display: flex; justify-content: space-between; gap: 10px; padding: 10px 0; border-bottom: 1px dashed var(--border); }
hr { border: 0; border-top: 1px solid var(--border); margin: 18px 0; }
.small-note { font-size: 12px; color: var(--muted); margin-top: 8px; }
@media (max-width: 1100px) {
  .top-grid, .main-grid, .bottom-grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .page { padding: 14px; }
  .hero { flex-direction: column; }
  .form-grid, .item-top { grid-template-columns: 1fr; }
}