/* ==========================================================================
   AMB Design - Tips Calculator by Hours
   Domain: https://amb-design.com
   Plain CSS3 (No Tailwind) - Responsive, Accessible, Print-Ready
   ========================================================================== */

:root {
  /* Color Palette - Light Theme (Default) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-accent-subtle: #ecfdf5;
  --bg-warning-subtle: #fffbeb;
  --bg-danger-subtle: #fef2f2;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-on-brand: #ffffff;

  --brand-primary: #059669;
  --brand-primary-hover: #047857;
  --brand-secondary: #0d9488;
  --brand-focus: rgba(5, 150, 105, 0.25);

  --accent-blue: #2563eb;
  --accent-amber: #d97706;
  --accent-danger: #dc2626;
  --accent-danger-hover: #b91c1c;

  --border-color: #e2e8f0;
  --border-strong: #cbd5e1;

  /* Shadows & Radius */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.05);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Layout */
  --container-max: 1200px;
  --header-height: 68px;
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #0b1120;
  --bg-secondary: #1e293b;
  --bg-tertiary: #0f172a;
  --bg-accent-subtle: rgba(16, 185, 129, 0.12);
  --bg-warning-subtle: rgba(245, 158, 11, 0.12);
  --bg-danger-subtle: rgba(239, 68, 68, 0.12);

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-on-brand: #ffffff;

  --brand-primary: #10b981;
  --brand-primary-hover: #059669;
  --brand-secondary: #14b8a6;
  --brand-focus: rgba(16, 185, 129, 0.35);

  --accent-blue: #3b82f6;
  --accent-amber: #f59e0b;
  --accent-danger: #ef4444;
  --accent-danger-hover: #dc2626;

  --border-color: #334155;
  --border-strong: #475569;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--brand-primary);
  color: var(--text-on-brand);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  z-index: 9999;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Typography Helpers */
h1, h2, h3, h4 {
  color: var(--text-primary);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

a {
  color: var(--brand-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--brand-primary-hover);
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 1rem;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 800;
  font-size: 1.2rem;
}

.brand-logo:hover {
  color: var(--brand-primary);
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  color: #ffffff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.brand-text span {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--brand-primary);
  background-color: var(--bg-tertiary);
}

.theme-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

/* Hero Section */
.hero-section {
  padding: 2.25rem 0 1.5rem;
  text-align: center;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--bg-accent-subtle);
  color: var(--brand-primary);
  border: 1px solid rgba(5, 150, 105, 0.25);
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.85rem;
}

.hero-section h1 {
  font-size: clamp(1.75rem, 3.5vw, 2.65rem);
  max-width: 800px;
  margin: 0 auto 0.75rem;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  max-width: 720px;
  margin: 0 auto 1.25rem;
}

.quick-presets {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.preset-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-right: 0.25rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-family: inherit;
  font-size: 0.925rem;
  font-weight: 600;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--brand-focus);
}

.btn-primary {
  background-color: var(--brand-primary);
  color: var(--text-on-brand);
}

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

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

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

.btn-subtle {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  border-color: var(--border-color);
  font-size: 0.82rem;
  padding: 0.4rem 0.8rem;
}

.btn-subtle:hover {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
  background-color: var(--bg-accent-subtle);
}

.btn-danger-outline {
  background-color: transparent;
  color: var(--accent-danger);
  border-color: rgba(220, 38, 38, 0.3);
}

.btn-danger-outline:hover {
  background-color: var(--bg-danger-subtle);
  border-color: var(--accent-danger);
}

.btn-icon-only {
  padding: 0.45rem;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
}

/* Main Calculator Layout */
.calculator-workspace {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 992px) {
  .calculator-workspace {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
}

/* Cards & Panels */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.15rem;
  font-weight: 700;
}

.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: var(--radius-full);
  background-color: var(--brand-primary);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 700;
}

/* Form Controls */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.label-hint {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix,
.input-suffix {
  position: absolute;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.95rem;
  pointer-events: none;
}

.input-prefix {
  left: 0.8rem;
}

.input-suffix {
  right: 0.8rem;
}

.form-control {
  width: 100%;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.75rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:hover {
  border-color: var(--text-muted);
}

.form-control:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px var(--brand-focus);
  background-color: var(--bg-secondary);
}

.has-prefix .form-control {
  padding-left: 2rem;
}

.has-suffix .form-control {
  padding-right: 2.25rem;
}

.input-lg {
  font-size: 1.2rem;
  font-weight: 700;
  padding-top: 0.7rem;
  padding-bottom: 0.7rem;
}

/* Advanced Options Drawer */
.advanced-options {
  margin-top: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-tertiary);
}

.advanced-options summary {
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
}

.advanced-options summary::-webkit-details-marker {
  display: none;
}

.advanced-options summary::after {
  content: "+";
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--brand-primary);
}

.advanced-options[open] summary::after {
  content: "−";
}

.advanced-options-body {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  border-bottom-left-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}

/* Toggle Switch Bar */
.mode-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border-color);
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--brand-primary);
  cursor: pointer;
}

/* Employee Roster Table / List */
.roster-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.roster-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.employee-row {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.1fr auto;
  gap: 0.65rem;
  align-items: end;
  padding: 0.85rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.employee-row.with-weights {
  grid-template-columns: 1.8fr 1.1fr 1fr 0.9fr auto;
}

.employee-row.with-wages {
  grid-template-columns: 1.8fr 1.1fr 1fr 1fr auto;
}

.employee-row.with-weights.with-wages {
  grid-template-columns: 1.6fr 1fr 0.9fr 0.85fr 0.95fr auto;
}

.employee-row:hover {
  border-color: var(--border-strong);
}

.employee-row:focus-within {
  border-color: var(--brand-primary);
  box-shadow: var(--shadow-sm);
}

.emp-field label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.emp-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding-bottom: 2px;
}

.emp-preview-pill {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding-top: 0.5rem;
  margin-top: 0.25rem;
  border-top: 1px dashed var(--border-color);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.emp-payout-highlight {
  font-weight: 700;
  color: var(--brand-primary);
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

@media (max-width: 680px) {
  .employee-row,
  .employee-row.with-weights,
  .employee-row.with-wages,
  .employee-row.with-weights.with-wages {
    grid-template-columns: 1fr 1fr;
  }

  .emp-name-col {
    grid-column: 1 / -1;
  }

  .emp-actions {
    grid-column: 1 / -1;
    justify-content: flex-end;
  }
}

.roster-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

/* Shift Time Helper Modal / Popover Box */
.time-helper-box {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
}

.time-helper-title {
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 0.65rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Sticky Results Dashboard */
.results-panel {
  position: sticky;
  top: calc(var(--header-height) + 1.25rem);
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.kpi-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.kpi-card.kpi-highlight {
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  color: #ffffff;
  border: none;
}

.kpi-card.kpi-highlight .kpi-label,
.kpi-card.kpi-highlight .kpi-sub {
  color: rgba(255, 255, 255, 0.88);
}

.kpi-card.kpi-highlight .kpi-value {
  color: #ffffff;
}

.kpi-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.kpi-value {
  font-size: 1.55rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-primary);
  line-height: 1.2;
}

.kpi-sub {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* Deduction Notice Banner */
.pool-summary-banner {
  background-color: var(--bg-accent-subtle);
  border: 1px solid rgba(5, 150, 105, 0.25);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.pool-summary-row {
  display: flex;
  justify-content: space-between;
  font-weight: 500;
}

.pool-summary-row.total {
  font-weight: 700;
  color: var(--brand-primary);
  border-top: 1px dashed rgba(5, 150, 105, 0.3);
  padding-top: 0.35rem;
  margin-top: 0.2rem;
}

/* Results Breakdown Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.results-table th,
.results-table td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.results-table th {
  background-color: var(--bg-tertiary);
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

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

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

.results-table tfoot td {
  background-color: var(--bg-tertiary);
  font-weight: 700;
  border-top: 2px solid var(--border-strong);
}

.num-col {
  text-align: right;
  font-family: var(--font-mono);
}

.role-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

/* Visual Share Bar Chart */
.share-chart {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.chart-row {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.chart-row-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 600;
}

.chart-bar-track {
  width: 100%;
  height: 10px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.chart-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--brand-primary), var(--brand-secondary));
  border-radius: var(--radius-full);
  transition: width 250ms ease;
}

/* Cash Bill Denomination Breakdown */
.bills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(76px, 1fr));
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.bill-chip {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.45rem;
  text-align: center;
}

.bill-denom {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand-primary);
}

.bill-count {
  display: block;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-primary);
}

/* Export & Action Buttons Grid */
.export-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.65rem;
  margin-top: 1rem;
}

/* Toast Notification */
.toast-notification {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background-color: var(--text-primary);
  color: var(--bg-secondary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 600;
  z-index: 1000;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease;
}

.toast-notification.show {
  opacity: 1;
  transform: translateY(0);
}

/* Saved Shifts History Section */
.saved-shifts-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.85rem;
  margin-top: 0.85rem;
}

.saved-shift-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.9rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.65rem;
}

.saved-shift-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Content & Educational Sections */
.content-section {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border-color);
}

.section-header {
  max-width: 760px;
  margin-bottom: 2rem;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--brand-primary);
  margin-bottom: 0.4rem;
}

.section-header h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  margin-bottom: 0.65rem;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.feature-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Formula Callout Box */
.formula-box {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--brand-primary);
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.formula-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  background-color: var(--bg-tertiary);
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  margin: 0.75rem 0;
  color: var(--brand-primary);
  overflow-x: auto;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  max-width: 880px;
}

.faq-item {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item summary {
  padding: 1.1rem 1.25rem;
  font-weight: 700;
  font-size: 1.02rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--brand-primary);
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 1.25rem 1.25rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

.faq-answer p + p {
  margin-top: 0.75rem;
}

/* Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0 2rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col h4 {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--brand-primary);
}

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Print Stylesheet for Tip Distribution Sheet */
.print-only-header {
  display: none;
}

@media print {
  body {
    background: #ffffff !important;
    color: #000000 !important;
    font-size: 11pt;
  }

  .site-header,
  .hero-section .quick-presets,
  .hero-section .badge-pill,
  .calculator-inputs-column,
  .export-actions,
  .content-section,
  .site-footer,
  .no-print {
    display: none !important;
  }

  .print-only-header {
    display: block !important;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid #000000;
  }

  .calculator-workspace {
    display: block !important;
    margin: 0 !important;
  }

  .results-panel {
    position: static !important;
  }

  .card {
    box-shadow: none !important;
    border: 1px solid #cccccc !important;
    padding: 1rem !important;
    margin-bottom: 1rem !important;
  }

  .kpi-card.kpi-highlight {
    background: #f0f0f0 !important;
    color: #000000 !important;
    border: 1px solid #000000 !important;
  }

  .kpi-card.kpi-highlight .kpi-label,
  .kpi-card.kpi-highlight .kpi-value,
  .kpi-card.kpi-highlight .kpi-sub {
    color: #000000 !important;
  }

  .signature-lines {
    display: grid !important;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2.5rem;
    padding-top: 1rem;
  }

  .signature-box {
    border-top: 1px solid #000000;
    padding-top: 0.35rem;
    font-size: 9pt;
  }
}

.signature-lines {
  display: none;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
}