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

:root {
  --paper:       #faf8f2;
  --paper-dark:  #f2efe4;
  --ink:         #2c2825;
  --ink-light:   #7a7267;
  --rule:        #e8e4d8;
  --accent:      #3d6b9e;
  --accent-hover:#2f5480;
  --danger:      #c0392b;
  --shadow:      0 2px 8px rgba(0,0,0,.10), 0 8px 32px rgba(0,0,0,.07);
  --radius:      12px;
  --font:        'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
  min-height: 100vh;
  background: #d9d4c7;
  background-image:
    radial-gradient(circle at 20% 20%, #cdc8ba 0%, transparent 60%),
    radial-gradient(circle at 80% 80%, #bfbaa8 0%, transparent 60%);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 48px 16px 80px;
  font-family: var(--font);
  color: var(--ink);
}

/* ── Notebook ─────────────────────────────────────────────────────────────── */
.notebook {
  width: 100%;
  max-width: 680px;
  background: var(--paper);
  border-radius: var(--radius);
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(0,0,0,.04);
  overflow: hidden;
  position: relative;
}

/* Spiral binding effect */
.notebook::before {
  content: '';
  position: absolute;
  top: 0; left: 36px;
  width: 2px; height: 100%;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 22px,
    #c8c2b0 22px,
    #c8c2b0 24px
  );
  opacity: .5;
  pointer-events: none;
}

/* ── Header ───────────────────────────────────────────────────────────────── */
.notebook-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 28px 20px 56px;
  background: var(--paper-dark);
  border-bottom: 2px solid var(--rule);
}

.notebook-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -.5px;
  color: var(--ink);
}

.subtitle {
  font-size: .8rem;
  color: var(--ink-light);
  margin-top: 2px;
}

/* ── Settings ─────────────────────────────────────────────────────────────── */
.settings-wrapper {
  position: relative;
}

.settings-btn {
  background: none;
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 7px;
  cursor: pointer;
  color: var(--ink-light);
  display: flex;
  align-items: center;
  transition: background .15s, color .15s;
}
.settings-btn:hover {
  background: var(--rule);
  color: var(--ink);
}

.settings-popover {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 14px 16px;
  box-shadow: 0 4px 16px rgba(0,0,0,.12);
  min-width: 180px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.settings-popover[hidden] { display: none; }

.settings-label {
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ink-light);
}

.currency-select {
  padding: 6px 10px;
  border: 1px solid var(--rule);
  border-radius: 7px;
  font-size: .88rem;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  cursor: pointer;
  outline: none;
  transition: border-color .15s;
}
.currency-select:focus { border-color: var(--accent); }

/* ── Sheet ────────────────────────────────────────────────────────────────── */
.sheet-wrapper {
  padding: 0 28px 0 56px;
}

.sheet {
  width: 100%;
  border-collapse: collapse;
  margin-top: 4px;
}

/* Ruled lines via tr backgrounds */
.sheet thead tr {
  border-bottom: 2px solid var(--accent);
}

.sheet th {
  padding: 14px 10px 10px;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--ink-light);
  text-align: left;
}

.sheet tbody tr {
  border-bottom: 1px solid var(--rule);
  transition: background .1s;
}
.sheet tbody tr:hover { background: rgba(0,0,0,.018); }

.sheet td {
  padding: 2px 4px;
}

.col-item  { width: 44%; }
.col-price { width: 22%; }
.col-person{ width: 28%; }
.col-delete{ width: 6%; }

.cell-input {
  width: 100%;
  background: none;
  border: none;
  outline: none;
  font-family: var(--font);
  /* 16px prevents iOS Safari from zooming on focus */
  font-size: 16px;
  color: var(--ink);
  padding: 9px 6px;
  transition: background .15s;
  border-radius: 5px;
}
.cell-input:focus {
  background: rgba(61, 107, 158, .07);
}
.cell-input.price-input {
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.cell-input::placeholder { color: #bbb; }

.delete-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: #ccc;
  font-size: 1rem;
  padding: 8px;
  border-radius: 5px;
  transition: color .15s, background .15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.delete-btn:hover { color: var(--danger); background: #fdecea; }

/* ── Split Section ────────────────────────────────────────────────────────── */
.split-section {
  border-top: 2px solid var(--rule);
  background: var(--paper-dark);
  padding: 20px 28px 28px 56px;
}

.split-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}

.split-tabs {
  display: flex;
  gap: 8px;
}

.split-tab {
  padding: 8px 18px;
  border-radius: 20px;
  border: 1.5px solid var(--rule);
  background: none;
  font-family: var(--font);
  font-size: .85rem;
  color: var(--ink-light);
  cursor: pointer;
  transition: all .15s;
}
.split-tab:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.split-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

/* ── Results ──────────────────────────────────────────────────────────────── */
.split-results {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.result-empty {
  color: var(--ink-light);
  font-size: .88rem;
  font-style: italic;
  padding: 8px 0;
}

/* Equal split */
.equal-summary {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.total-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: .93rem;
  color: var(--ink-light);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}
.total-line .amount {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--ink);
}

.per-person-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
}
.per-person-line .amount {
  font-size: 1.35rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.people-count {
  font-size: .8rem;
  color: var(--ink-light);
  font-weight: 400;
  margin-left: 4px;
}

/* By person */
.person-cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.person-card {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 10px;
  overflow: hidden;
}

.person-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--paper-dark);
  border-bottom: 1px solid var(--rule);
}

.person-name {
  font-weight: 700;
  font-size: .93rem;
}
.person-name.unassigned { color: var(--ink-light); font-style: italic; }

.person-total {
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.person-items {
  padding: 6px 0;
}

.person-item-row {
  display: flex;
  justify-content: space-between;
  padding: 5px 14px;
  font-size: .85rem;
  color: var(--ink);
}
.person-item-row + .person-item-row {
  border-top: 1px solid var(--rule);
}
.person-item-row .item-price {
  font-variant-numeric: tabular-nums;
  color: var(--ink-light);
}

.grand-total-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 4px;
  padding: 10px 0 0;
  border-top: 2px solid var(--rule);
  font-size: .88rem;
  color: var(--ink-light);
}
.grand-total-row .amount {
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* ── Copy Button ──────────────────────────────────────────────────────────── */
.copy-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1.5px solid var(--rule);
  border-radius: 8px;
  background: none;
  font-family: var(--font);
  font-size: .82rem;
  color: var(--ink-light);
  cursor: pointer;
  white-space: nowrap;
  transition: border-color .15s, color .15s, background .15s;
  flex-shrink: 0;
}
.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(61,107,158,.05);
}
.copy-btn.copied {
  border-color: #2e7d52;
  color: #2e7d52;
  background: rgba(46,125,82,.07);
}

/* ── Autocomplete Dropdown ────────────────────────────────────────────────── */
.autocomplete-dropdown {
  position: absolute;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,.13);
  z-index: 200;
  min-width: 140px;
  overflow: hidden;
  display: none;
}
.autocomplete-dropdown.visible { display: block; }

.autocomplete-item {
  padding: 9px 14px;
  font-size: .9rem;
  font-family: var(--font);
  color: var(--ink);
  cursor: pointer;
  transition: background .1s;
}
.autocomplete-item + .autocomplete-item {
  border-top: 1px solid var(--rule);
}
.autocomplete-item:hover,
.autocomplete-item.highlighted {
  background: rgba(61,107,158,.09);
  color: var(--accent);
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 480px) {
  body { padding: 16px 8px 60px; }
  .notebook::before { left: 20px; }
  .notebook-header,
  .sheet-wrapper,
  .split-section { padding-left: 36px; }
  .col-item  { width: 42%; }
  .col-price { width: 24%; }
  .col-person{ width: 28%; }
}