:root {
  --color-bg: #f4f5f7;
  --color-surface: #ffffff;
  --color-border: #e0e2e7;
  --color-text: #1f2430;
  --color-text-muted: #6b7280;
  --color-primary: #2f6fed;
  --color-primary-dark: #1e54c4;
  --color-danger: #e0453e;
  --color-ventes: #1a9e5c;
  --color-achats: #c9532c;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--color-bg);
  color: var(--color-text);
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 720px;
  margin: 0 auto;
  background: var(--color-surface);
  box-shadow: 0 0 24px rgba(0,0,0,0.06);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-border);
}

.app-header h1 {
  font-size: 18px;
  margin: 0;
}

.month-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.month-picker input {
  font-size: 14px;
  padding: 4px 6px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
}

.tabs {
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  padding: 0 20px;
  gap: 4px;
}

.tab-btn {
  border: none;
  background: transparent;
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
}

.tab-btn.active {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
  font-weight: 600;
}

.tabs-total {
  margin-left: auto;
  font-size: 13px;
  color: var(--color-text-muted);
}

.entries-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.entries-table-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: 8px 20px;
}

.entries-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.entries-table thead th {
  text-align: left;
  font-size: 12px;
  color: var(--color-text-muted);
  font-weight: 500;
  padding: 6px 4px;
  position: sticky;
  top: 0;
  background: var(--color-surface);
}

.entries-table td {
  padding: 7px 4px;
  border-bottom: 1px solid var(--color-border);
}

.col-day { width: 70px; }
.col-amount { text-align: right; }
.col-actions { width: 36px; }

.entries-table td.col-amount {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.row-ventes td.col-amount { color: var(--color-ventes); }
.row-achats td.col-amount { color: var(--color-achats); }

.btn-delete {
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 2px 6px;
  border-radius: 4px;
}

.btn-delete:hover {
  color: var(--color-danger);
  background: #fdeceb;
}

.empty-state {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 13px;
  padding: 24px 0;
}

.entry-form {
  flex-shrink: 0;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 12px 20px;
  border-top: 1px solid var(--color-border);
  background: #fafbfc;
  position: relative;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field label {
  font-size: 11px;
  color: var(--color-text-muted);
}

.field input {
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 15px;
}

.field input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(47,111,237,0.15);
}

#dayInputField { width: 70px; }
.field-amount input { width: 100px; }

.field-multiplier {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--color-text-muted);
  white-space: nowrap;
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  cursor: pointer;
}

#multiplierValue {
  width: 98px;
}

#multiplierValue:disabled {
  background: #f2f3f5;
  color: var(--color-text-muted);
}

.btn-add {
  padding: 9px 16px;
  border: none;
  border-radius: 6px;
  background: var(--color-primary);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}

.btn-add:hover { background: var(--color-primary-dark); }

.form-error {
  position: absolute;
  bottom: -18px;
  left: 20px;
  color: var(--color-danger);
  font-size: 12px;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  flex-wrap: wrap;
  gap: 8px;
}

.toolbar-group {
  display: flex;
  gap: 8px;
  align-items: center;
}

.toolbar button, .file-btn {
  padding: 7px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #fff;
  font-size: 12.5px;
  cursor: pointer;
  color: var(--color-text);
}

.toolbar button:hover, .file-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.toolbar-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 2px;
}

.toolbar .icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
}

.toolbar .icon-btn svg {
  width: 16px;
  height: 16px;
  display: block;
}

.toolbar .btn-excel {
  background: #1d6f42;
  color: #fff;
  border-color: #1d6f42;
  font-weight: 600;
}

.toolbar .btn-excel:hover {
  background: #155432;
  color: #fff;
  border-color: #155432;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-backdrop.open { display: flex; }

.modal {
  background: #fff;
  border-radius: 10px;
  padding: 20px;
  width: 90%;
  max-width: 480px;
  max-height: 80vh;
  overflow-y: auto;
}

.modal h2 {
  margin: 0 0 10px;
  font-size: 16px;
}

.modal-body {
  font-size: 13.5px;
  color: var(--color-text);
  line-height: 1.5;
}

.modal-body ul {
  margin: 8px 0;
  padding-left: 18px;
  max-height: 200px;
  overflow-y: auto;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
}

.modal-actions button {
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background: #fff;
  cursor: pointer;
  font-size: 13px;
}

.modal-actions button.btn-danger {
  background: var(--color-danger);
  color: #fff;
  border-color: var(--color-danger);
}

.modal-actions button.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.settings-field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
}

.settings-field label {
  font-size: 13px;
  color: var(--color-text-muted);
}

.settings-field input {
  width: 70px;
  padding: 6px 8px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-transform: uppercase;
  text-align: center;
}

.settings-error {
  color: var(--color-danger);
  font-size: 12.5px;
  min-height: 16px;
}

.settings-divider {
  border-top: 1px solid var(--color-border);
  margin: 16px 0 10px;
}

.settings-subtitle {
  font-size: 12.5px;
  color: var(--color-text-muted);
  margin: 0 0 8px;
}

.constant-column-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.constant-column-row input.constant-col-letter {
  width: 56px;
  padding: 6px 8px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-transform: uppercase;
  text-align: center;
}

.constant-column-row input.constant-col-value {
  flex: 1;
  padding: 6px 8px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
}

.constant-column-row .btn-remove-constant {
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 15px;
  padding: 2px 6px;
  border-radius: 4px;
}

.constant-column-row .btn-remove-constant:hover {
  color: var(--color-danger);
  background: #fdeceb;
}

.btn-add-constant {
  padding: 6px 10px;
  border: 1px dashed var(--color-border);
  border-radius: 6px;
  background: #fff;
  font-size: 12.5px;
  cursor: pointer;
  color: var(--color-text-muted);
}

.btn-add-constant:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.toast-container {
  position: fixed;
  bottom: 16px;
  right: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 200;
}

.toast {
  background: #1f2430;
  color: #fff;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 13px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  animation: toast-in 0.15s ease-out;
}

.toast.error { background: var(--color-danger); }

@keyframes toast-in {
  from { transform: translateY(8px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}