/* ============================================
   CSS VARIABLES & RESET
   ============================================ */
:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-secondary: #475569;
  --color-secondary-hover: #334155;
  --color-danger: #dc2626;
  --color-danger-light: #fef2f2;
  --color-success: #16a34a;
  --color-success-light: #f0fdf4;
  --color-warning: #d97706;
  --color-warning-light: #fffbeb;
  --color-bg: #f1f5f9;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --transition: 150ms ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
}

/* ============================================
   LAYOUT
   ============================================ */
#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-brand h1 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
}

.header-icon {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.header-nav {
  display: flex;
  gap: 2px;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 0.87rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-btn svg {
  width: 16px;
  height: 16px;
}

.nav-btn:hover {
  background: var(--color-bg);
  color: var(--color-text);
}

.nav-btn.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.app-main {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
}

/* ============================================
   VIEWS
   ============================================ */
.view {
  display: none;
}

.view.active {
  display: block;
}

.view-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.view-header h2 {
  font-size: 1.4rem;
  font-weight: 700;
}

.view-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

.card-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.card-header h3 {
  font-size: 0.93rem;
  font-weight: 600;
  color: var(--color-text);
}

.card-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.card-actions select {
  padding: 7px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.87rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
  max-width: 240px;
}

.card-actions select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.card-body {
  padding: 16px 20px;
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
  margin-bottom: 12px;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-group input[readonly] {
  background: var(--color-bg);
  color: var(--color-text-secondary);
}

.form-group textarea {
  resize: vertical;
}

.form-group-checkbox {
  padding: 12px 0 4px;
}

.checkbox-label {
  display: flex !important;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  cursor: pointer;
  flex-shrink: 0;
}

.form-hint {
  display: block;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: 4px;
  padding-left: 26px;
}

.input-with-action {
  display: flex;
  gap: 4px;
  align-items: center;
}

.input-with-action input {
  flex: 1;
}

.btn-input-action {
  padding: 6px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
}

.btn-input-action svg {
  width: 15px;
  height: 15px;
}

.btn-input-action.editing {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.form-row {
  display: grid;
  gap: 12px;
}

.form-row.cols-2 { grid-template-columns: 1fr 1fr; }
.form-row.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
.form-row.cols-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }

.form-row .form-group {
  margin-bottom: 12px;
}

.form-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 8px;
  padding: 16px 0;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.87rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn-sm svg {
  width: 14px;
  height: 14px;
}

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

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

.btn-secondary {
  background: var(--color-secondary);
  color: #fff;
  border-color: var(--color-secondary);
}

.btn-secondary:hover {
  background: var(--color-secondary-hover);
  border-color: var(--color-secondary-hover);
}

.btn-outline {
  background: var(--color-surface);
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.btn-outline:hover {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

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

.btn-danger:hover {
  background: #b91c1c;
  border-color: #b91c1c;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: none;
  padding: 6px;
}

.btn-ghost:hover {
  color: var(--color-danger);
  background: var(--color-danger-light);
}

/* ============================================
   LINE ITEMS
   ============================================ */
.line-items-header {
  display: grid;
  grid-template-columns: 1fr 70px 100px 80px 110px 40px;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 4px;
}

.line-items-header span {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.line-item {
  display: grid;
  grid-template-columns: 1fr 70px 100px 80px 110px 40px;
  gap: 8px;
  padding: 6px 0;
  align-items: start;
  border-bottom: 1px solid var(--color-border);
}

.line-item:last-child {
  border-bottom: none;
}

.line-item input,
.line-item textarea {
  width: 100%;
  padding: 7px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.87rem;
  font-family: inherit;
  color: var(--color-text);
  transition: border-color var(--transition);
}

.line-item textarea {
  resize: vertical;
  min-height: 38px;
}

.line-item input:focus,
.line-item textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.line-item input[type="number"] {
  text-align: right;
}

.line-item .li-total-value {
  text-align: right;
  font-weight: 600;
  font-size: 0.87rem;
  color: var(--color-text);
  padding-right: 4px;
}

.btn-add-line {
  margin-top: 10px;
  width: 100%;
  justify-content: center;
  border-style: dashed;
}

/* ============================================
   TOTALS
   ============================================ */
.card-totals {
  border-color: var(--color-primary-light);
  background: linear-gradient(135deg, #f8faff, var(--color-surface));
}

.totals-grid {
  display: flex;
  justify-content: flex-end;
}

.totals-summary {
  min-width: 280px;
}

.totals-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 0.9rem;
}

.totals-row span:first-child {
  color: var(--color-text-secondary);
}

.totals-row span:last-child {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.totals-row-final {
  border-top: 2px solid var(--color-primary);
  margin-top: 6px;
  padding-top: 10px;
  font-size: 1.05rem;
}

.totals-row-final span:first-child {
  color: var(--color-text);
  font-weight: 700;
}

.totals-row-final span:last-child {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.1rem;
}

.totals-row-discount span {
  color: var(--color-danger);
}

.totals-discount-input {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.totals-discount-input label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.totals-discount-input input {
  width: 80px;
  padding: 6px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.87rem;
  font-family: inherit;
  text-align: right;
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.totals-discount-input input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* ============================================
   MODAL
   ============================================ */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
}

.modal.active {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 30px;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 820px;
  max-height: calc(100vh - 60px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1rem;
  font-weight: 600;
}

.modal-actions {
  display: flex;
  gap: 8px;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

/* ============================================
   HISTORY
   ============================================ */
.search-input {
  padding: 7px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.87rem;
  font-family: inherit;
  width: 200px;
  transition: border-color var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.view-actions select {
  padding: 7px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.87rem;
  font-family: inherit;
  background: var(--color-surface);
  cursor: pointer;
}

.history-list {
  overflow-x: auto;
}

.clients-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.client-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.client-item:hover {
  box-shadow: var(--shadow);
}

/* History table */
.history-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  font-size: 0.87rem;
}

.history-table thead th {
  padding: 10px 14px;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: var(--color-bg);
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}

.history-table tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.history-table tbody tr:last-child td {
  border-bottom: none;
}

.history-table tbody tr:hover {
  background: var(--color-bg);
}

.history-table .cell-amount {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.history-table .cell-actions {
  text-align: right;
  white-space: nowrap;
}

.history-table .cell-actions .btn-ghost svg {
  width: 15px;
  height: 15px;
}

.history-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-invoice { background: var(--color-primary-light); color: var(--color-primary); }
.badge-quote { background: var(--color-warning-light); color: var(--color-warning); }
.badge-draft { background: #f1f5f9; color: var(--color-text-muted); }
.badge-sent { background: var(--color-primary-light); color: var(--color-primary); }
.badge-paid { background: var(--color-success-light); color: var(--color-success); }

.status-select {
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 0.73rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  cursor: pointer;
  appearance: auto;
}

.status-select.status-draft {
  background: #f1f5f9;
  color: var(--color-text-muted);
}

.status-select.status-sent {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.status-select.status-paid {
  background: var(--color-success-light);
  color: var(--color-success);
}

/* Client items */
.client-item-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.client-item-name {
  font-weight: 600;
  font-size: 0.93rem;
}

.client-item-details {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.client-item-actions {
  display: flex;
  gap: 4px;
}

.empty-state {
  text-align: center;
  color: var(--color-text-muted);
  padding: 48px 20px;
  font-size: 0.93rem;
}

/* ============================================
   LOGO UPLOAD
   ============================================ */
.logo-upload {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.logo-upload input[type="file"] {
  font-size: 0.8rem;
}

.logo-preview {
  width: 80px;
  height: 80px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--color-bg);
}

.logo-preview img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* ============================================
   TOAST
   ============================================ */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: var(--radius);
  background: var(--color-text);
  color: #fff;
  font-size: 0.87rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: toast-in 300ms ease;
  max-width: 360px;
}

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

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

.toast.toast-out {
  animation: toast-out 200ms ease forwards;
}

@keyframes toast-in {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes toast-out {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(100%); opacity: 0; }
}

/* ============================================
   FIRST-RUN BANNER
   ============================================ */
.first-run-banner {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 500;
  animation: toast-in 400ms ease;
}

.first-run-content {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-primary-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.first-run-content svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.first-run-content p {
  font-size: 0.87rem;
  color: var(--color-text-secondary);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    height: auto;
    padding: 12px 16px;
    gap: 8px;
  }

  .header-nav {
    width: 100%;
    overflow-x: auto;
  }

  .nav-btn span {
    display: none;
  }

  .app-main {
    padding: 16px;
  }

  .form-row.cols-3,
  .form-row.cols-4 {
    grid-template-columns: 1fr 1fr;
  }

  .line-items-header,
  .line-item {
    grid-template-columns: 1fr 55px 80px 65px 90px 36px;
    gap: 4px;
  }

  .form-actions {
    flex-wrap: wrap;
  }

  .view-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .view-actions {
    width: 100%;
  }

  .search-input {
    flex: 1;
    width: auto;
  }

  .modal.active {
    padding: 10px;
  }

  .first-run-content {
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .form-row.cols-2,
  .form-row.cols-3,
  .form-row.cols-4 {
    grid-template-columns: 1fr;
  }

  .line-items-header {
    display: none;
  }

  .line-item {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 12px 0;
  }

  .card-actions {
    flex-wrap: wrap;
  }
}