/* Material Design & Responsive Styles for Invoice Entry */
:root {
  --primary: #1976d2;
  --primary-hover: #1565c0;
  --primary-light: #e3f2fd;
  --accent: #2e7d32;
  --accent-hover: #1b5e20;
  --bg-color: #f4f6f9;
  --card-bg: #ffffff;
  --text-main: #1f2937;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --input-border: #cbd5e1;
  --border-focus: #1976d2;
  --shadow-sm: 0 2px 6px rgba(0,0,0,0.06);
  --shadow-md: 0 6px 16px rgba(0,0,0,0.08);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  font-size: 1.05rem; /* ~17px readable desktop text */
  line-height: 1.6;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

.app-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem 1.5rem;
}

/* Material App Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border-color);
}

.app-header h1 {
  font-size: 1.85rem;
  font-weight: 700;
  margin: 0;
  color: #1a237e;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.header-actions {
  display: flex;
  gap: 1rem;
}

/* Material Stepper Indicator */
.stepper-nav {
  display: flex;
  justify-content: space-between;
  background: var(--card-bg);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  padding: 0.65rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
  overflow-x: auto;
}

.step-indicator {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.5rem;
  border-radius: 10px;
  cursor: pointer;
  border: none;
  background: transparent;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-muted);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.step-indicator .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #e2e8f0;
  color: #334155;
  margin-right: 0.65rem;
  font-size: 1rem;
  font-weight: 700;
}

.step-indicator.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(25, 118, 210, 0.35);
}

.step-indicator.active .step-number {
  background: #ffffff;
  color: var(--primary);
}

.step-indicator.completed .step-number {
  background: var(--accent);
  color: #ffffff;
}

/* Step Content Panes */
.form-step {
  display: none;
  animation: fadeIn 0.25s ease-in-out;
}

.form-step.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Material Cards */
.md-card {
  background: var(--card-bg);
  border-radius: 14px;
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

.md-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1.5px solid #f1f5f9;
}

.md-card-header h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0;
  color: #1e293b;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Chips for Suggestions */
.chip-group-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.65rem;
}

.chips-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 1.5rem;
  max-height: 220px;
  overflow-y: auto;
  padding: 0.25rem;
}

.suggestion-chip {
  background: var(--primary-light);
  color: var(--primary);
  border: 1.5px solid #bbdefb;
  border-radius: 24px;
  padding: 0.55rem 1.15rem;
  font-size: 0.98rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.suggestion-chip:hover {
  background: #bbdefb;
  transform: translateY(-1px);
}

.suggestion-chip:active {
  transform: scale(0.98);
}

.suggestion-chip.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* Form Controls */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.form-group-md {
  display: flex;
  flex-direction: column;
}

.form-group-md label {
  font-size: 1.05rem;
  font-weight: 600;
  color: #334155;
  margin-bottom: 0.5rem;
}

.form-group-md input,
.form-group-md textarea,
.form-group-md select {
  font-size: 1.05rem;
  padding: 0.8rem 1rem;
  min-height: 48px;
  border: 1.5px solid var(--input-border);
  border-radius: 9px;
  background-color: #fff;
  color: var(--text-main);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group-md textarea {
  font-size: 1.05rem;
  line-height: 1.6;
  padding: 0.85rem 1rem;
  min-height: 120px;
}

.form-group-md input:focus,
.form-group-md textarea:focus,
.form-group-md select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.18);
}

.split-input-row {
  display: flex;
  gap: 0.65rem;
}

.split-input-row input:first-child {
  flex: 3;
}

.split-input-row input:last-child {
  flex: 1.5;
}

/* Material Items Table (No horizontal scrolling on desktop) */
.items-table-container {
  width: 100%;
  overflow: visible;
  margin-top: 1.25rem;
}

.md-table {
  width: 100%;
  border-collapse: collapse;
  background: #ffffff;
  table-layout: fixed;
}

.md-table th {
  background: #f8fafc;
  color: #1e293b;
  font-weight: 700;
  font-size: 1.02rem;
  text-align: left;
  padding: 0.85rem 0.6rem;
  border-bottom: 2px solid var(--border-color);
  white-space: nowrap;
}

.md-table td {
  padding: 0.65rem 0.5rem;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: middle;
}

.md-table tr:hover {
  background-color: #f8fafc;
}

.md-table input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  min-height: 44px;
  border: 1.5px solid var(--input-border);
  border-radius: 7px;
  font-size: 1.02rem;
  box-sizing: border-box;
}

.md-table input:focus {
  outline: none;
  border-color: var(--border-focus);
}

.qty-unit-cell {
  display: flex;
  gap: 0.35rem;
  width: 100%;
  min-width: 0;
}

.qty-unit-cell input {
  min-width: 0;
}

.qty-unit-cell input:first-child {
  flex: 3;
}

.qty-unit-cell input:last-child {
  flex: 2;
}

.particulars-cell {
  min-width: 0;
  width: 100%;
}

.item-amount-cell {
  font-weight: 700;
  white-space: nowrap;
  font-size: 1.15rem;
  color: #1e3a8a;
  text-align: right;
  padding-right: 0.65rem !important;
}

.actions-cell {
  white-space: nowrap;
  text-align: center;
}

.icon-btn {
  background: transparent;
  border: none;
  font-size: 1.35rem;
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s;
}

.icon-btn:hover {
  background: #f1f5f9;
}

.icon-btn.delete-btn {
  color: #dc2626;
}

.icon-btn.copy-btn {
  color: #2563eb;
}

.mobile-field-label,
.mobile-sno-badge,
.mobile-amount-label {
  display: none;
}

/* Totals Summary Card */
.totals-summary-card {
  background: #f8fafc;
  border: 1.5px solid var(--border-color);
  border-radius: 14px;
  padding: 1.5rem 2rem;
  margin-top: 1.75rem;
}

.totals-row {
  display: flex;
  justify-content: space-between;
  padding: 0.45rem 0;
  font-size: 1.1rem;
  color: #475569;
}

.grand-total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0 0.5rem 0;
  margin-top: 0.75rem;
  border-top: 2.5px dashed #cbd5e1;
  font-size: 1.65rem;
  font-weight: 800;
  color: #1a237e;
}

/* Material Navigation Buttons */
.step-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2.25rem;
  padding-top: 1rem;
}

.btn-md {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-size: 1.1rem;
  font-weight: 600;
  padding: 0.85rem 1.85rem;
  min-height: 50px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none !important;
  user-select: none;
}

.btn-primary-md {
  background-color: var(--primary);
  color: #ffffff !important;
  box-shadow: 0 3px 8px rgba(25, 118, 210, 0.35);
}

.btn-primary-md:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 6px 14px rgba(25, 118, 210, 0.45);
}

.btn-secondary-md {
  background-color: #ffffff;
  color: #334155 !important;
  border: 1.5px solid var(--border-color);
}

.btn-secondary-md:hover {
  background-color: #f8fafc;
  border-color: #94a3b8;
}

.btn-accent-md {
  background-color: var(--accent);
  color: #ffffff !important;
  box-shadow: 0 3px 8px rgba(46, 125, 50, 0.35);
}

.btn-accent-md:hover {
  background-color: var(--accent-hover);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .app-container {
    padding: 1rem 0.75rem 3rem 0.75rem;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .app-header h1 {
    font-size: 1.45rem;
  }

  .stepper-nav {
    padding: 0.35rem;
  }

  .step-indicator {
    padding: 0.65rem 0.5rem;
    font-size: 0.95rem;
  }

  .step-indicator .step-title {
    display: none;
  }

  .step-indicator.active .step-title {
    display: inline;
  }

  .md-card {
    padding: 1.25rem 1rem;
    border-radius: 12px;
  }

  .form-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .step-actions {
    flex-direction: column;
    gap: 0.85rem;
  }

  .step-actions button,
  .step-actions a {
    width: 100%;
  }

  .grand-total-row {
    font-size: 1.35rem;
  }

  /* Transform table into responsive cards on mobile (NO horizontal scroll) */
  .items-table-container {
    overflow: visible;
  }

  .md-table.items-entry-table,
  .md-table.items-entry-table thead,
  .md-table.items-entry-table tbody,
  .md-table.items-entry-table tr,
  .md-table.items-entry-table th,
  .md-table.items-entry-table td {
    display: block;
    width: 100% !important;
    box-sizing: border-box;
  }

  .md-table.items-entry-table thead {
    display: none;
  }

  .md-table.items-entry-table tr {
    background: #ffffff;
    border: 1.5px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1.25rem;
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
    position: relative;
  }

  .desktop-sno {
    display: none;
  }

  .mobile-field-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-bottom: 0.3rem;
  }

  .mobile-sno-badge {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.95rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 14px;
    margin-bottom: 0.5rem;
  }

  .col-actions {
    position: absolute;
    top: 0.85rem;
    right: 0.85rem;
    display: flex;
    gap: 0.45rem;
  }

  .col-sno {
    padding: 0 0 0.35rem 0 !important;
    border: none !important;
  }

  .col-particulars {
    padding: 0.35rem 0 0.65rem 0 !important;
    border: none !important;
  }

  .col-qty,
  .col-hsn,
  .col-rate {
    padding: 0.45rem 0 !important;
    border: none !important;
  }

  .col-amount {
    margin-top: 0.75rem;
    padding: 0.75rem 0.85rem !important;
    background: #f8fafc;
    border-radius: 8px;
    border: 1.5px dashed #cbd5e1 !important;
    text-align: right !important;
    font-size: 1.15rem !important;
  }

  .mobile-amount-label {
    display: inline;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-right: 0.35rem;
  }
}