:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --border: #d9e0e7;
  --text: #1f2933;
  --muted: #52616b;
  --accent: #2f80ed;
  --accent-strong: #1c65c1;
  --success: #166534;
  --radius: 10px;
  --shadow: 0 6px 24px -12px rgba(0, 0, 0, 0.3);
  --header-height: 120px;
  --tab-height-mobile: 56px;
  --tab-height-desktop: 64px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.hidden {
  display: none !important;
}

.app-header {
  padding: 1.5rem 1.25rem 0.75rem;
  text-align: center;
  height: var(--header-height);
  min-height: var(--header-height);
  box-sizing: border-box;
}

.app-header h1 {
  margin: 0;
  font-size: 1.8rem;
  letter-spacing: -0.02em;
}

.app-header p {
  margin: 0.25rem 0 0;
  color: var(--muted);
}

.container {
  width: 100vw;
  margin: 0;
  padding: 0 1rem 1.25rem;
  display: grid;
  grid-template-columns: minmax(0, 1080px);
  justify-content: center;
  justify-items: center;
  gap: 1rem;
  height: calc(100vh - var(--header-height) - var(--tab-height-mobile));
  overflow-y: auto;
  box-sizing: border-box;
}

.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--tab-height-mobile);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--card);
  border-top: 1px solid var(--border);
  box-shadow: 0 -4px 18px -14px rgba(0, 0, 0, 0.4);
  z-index: 10;
}

.tab-button {
  border: none;
  background: transparent;
  padding: 0.75rem 0.5rem;
  font-weight: 700;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}

.tab-button.active {
  color: var(--accent-strong);
  background: rgba(47, 128, 237, 0.08);
}

.tab-panel {
  width: min(90vw, 720px);
  max-width: 720px;
  min-width: 280px;
  margin: 0 auto;
  justify-self: center;
  display: block;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

small {
  color: var(--muted);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.75rem 1rem;
}

label {
  display: flex;
  flex-direction: column;
  font-weight: 600;
  color: var(--muted);
  gap: 0.35rem;
  font-size: 0.95rem;
}

input,
textarea,
select,
button {
  font: inherit;
}

input,
select,
textarea {
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #f9fafb;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47, 128, 237, 0.15);
}

textarea {
  resize: vertical;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 0.65rem 1rem;
  background: var(--accent);
  color: white;
  font-weight: 700;
  transition: background 0.2s ease, transform 0.05s ease;
}

button:hover {
  background: var(--accent-strong);
  color: var(--card)
}

button:active {
  transform: translateY(1px);
}

button.secondary {
  background: #e7eef5;
  color: #1f2933;
}

button.secondary:hover {
  background: #d9e6f2;
}

.form-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.full-width {
  grid-column: 1 / -1;
}

.inline-field {
  display: inline-flex;
  gap: 0.35rem;
  align-items: center;
  width: 100%;
}

.inline-field input {
  flex: 1;
  min-width: 0;
}

.inline-field button {
  flex-shrink: 0;
}

.barcode-type-select {
  margin-top: 0.35rem;
  width: 100%;
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  overflow: hidden;
}

.modal-content {
  background: #fff;
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-width: 340px;
  align-items: center;
  max-width: min(520px, 92vw);
  overflow: visible;
}

.close-modal {
  position: absolute;
  top: 0.35rem;
  right: 0.35rem;
}

.utility-actions {
  margin-top: 0.75rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.voucher-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.voucher-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem;
  background: #fbfcfe;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  position: relative;
}

.voucher-card.collapsed {
  cursor: pointer;
}

.voucher-card header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.35rem;
  position: relative;
}

.expand-icon {
  text-align: end;
}

.chevron {
  font-size: 1.15rem;
  color: var(--muted);
  transition: transform 0.2s ease;
  display: inline-block;
}

.voucher-card.collapsed .chevron {
  transform: rotate(0deg);
}

.voucher-card.expanded .chevron {
  transform: rotate(90deg);
}

.voucher-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.balance-line {
  display: block;
}

.voucher-expiry {
  color: #b42318;
  font-weight: 600;
  font-size: 0.95rem;
}

.badge.badge-ghost {
  background: #eef2f6;
  color: var(--muted);
}

.badge.badge-warning {
  background: #fff8e1;
  color: #a05a00;
}

.voucher-meta {
  text-align: end;
  font-size: 0.95rem;
  color: var(--muted);
}

.voucher-meta-row {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  align-items: flex-start;
}

.voucher-expenses {
  font-size: 0.95rem;
  color: var(--muted);
}

.note-display {
  margin: 0.5rem 0;
  font-size: 0.95rem;
  color: var(--muted);
  display: flex;
  gap: 0.35rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: #eef4ff;
  border-radius: 999px;
  padding: 0.15rem 0.5rem;
  color: #1c3d7a;
  font-weight: 700;
  font-size: 0.9rem;
}

.voucher-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.voucher-actions-compact {
  align-items: flex-end;
  gap: 0.35rem;
  flex-wrap: nowrap;
}

.icon-btn {
  padding: 0.6rem 0.7rem;
  min-width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.barcode-btn {
  background: #eef2f6;
  color: var(--muted);
  padding:0.25rem 0.5rem;
  display: inline-flex;
}

.barcode-btn:hover {
  background: #e0e6ee;
}

.voucher-actions input,
.voucher-actions textarea {
  background: white;
  flex: 1;
}

.voucher-actions textarea {
  min-height: 60px;
}

.voucher-toggle {
  margin-left: auto;
}

.button-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

.button-ghost:hover {
  background: #eef2f6;
}

.payment-list {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem;
  margin: 0.75rem 0;
}

.payment-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem;
  background: #fbfcfe;
}

.payment-amount {
  font-weight: 700;
  color: #b42318;
}

.payment-amount.positive {
  color: var(--success);
}

.toast {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(var(--tab-height-mobile) + 12px);
  background: var(--success);
  color: white;
  padding: 0.65rem 1rem;
  border-radius: 10px;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 30;
}

.toast.visible {
  opacity: 1;
}

#barcodeCanvas {
  display: block;
  max-width: 90vw;
  max-height: 70vh;
}

.barcode-vertical {
  transform: rotate(90deg);
  transform-origin: center;
  max-width: none;
  min-width: auto;
  max-height: 90vh;
  width: auto;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0.5rem 0;
}

@media (min-width: 900px) {
  .tab-bar {
    position: sticky;
    top: 0;
    bottom: auto;
    height: var(--tab-height-desktop);
    border-top: none;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
  }

  .container {
    grid-template-columns: 1fr;
    height: calc(100vh - var(--header-height) - var(--tab-height-desktop));
  }

  .toast {
    bottom: 20px;
  }
}