/* ---- Color & Typography Variables ---- */
:root {
  --primary-bg: #f8f9fa;
  --surface-1: #ffffff;
  --surface-2: #f5f6f7;
  --border-light: #e0e3e8;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-muted: #999999;
  --accent-orange: #f88e30;
  --accent-green: #5fc857;
  --accent-blue: #2563eb;
  --highlight: #ff9f43;
  --success: #10b981;
  --warning: #ff9f43;
  --error: #ef4444;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: "Courier New", Courier, monospace;

  --spacing-xs: 0.375rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 1.5rem;
  --spacing-2xl: 1.5rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.625rem;

  --transition: 150ms ease-out;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--primary-bg);
  min-height: 100vh;
}

/* ---- Container & Layout ---- */
.calculator-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--spacing-lg);
}

.calculator-header {
  grid-column: 1 / -1;
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.demo-banner {
  display: inline-block;
  margin-bottom: var(--spacing-xs);
  padding: 0.3rem 0.55rem;
  border-radius: var(--radius-sm);
  border: 1px solid #f3b27a;
  background: #fff3e5;
  color: #9a4e04;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.demo-meta-link {
  color: var(--accent-blue);
  font-weight: 600;
  text-decoration: none;
}

.demo-meta-link:hover {
  text-decoration: underline;
}

.calculator-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.calculator-header .lead {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ---- Main Grid ---- */
.calculator-form {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  margin-bottom: 0;
}

.calculator-summary {
  position: sticky;
  top: var(--spacing-lg);
  height: fit-content;
}

@media (min-width: 1024px) {
  .calculator-container {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--spacing-lg);
  }

  .calculator-form {
    grid-column: 1;
  }

  .calculator-summary {
    grid-column: 2;
    grid-row: 2;
  }
}

/* ---- Form Sections ---- */
.form-section {
  grid-column: 1 / -1;
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-sm) var(--spacing-md);
}

.section-title {
  grid-column: 1 / -1;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-orange);
  margin-bottom: var(--spacing-xs);
  margin-top: 0;
}

.section-title:first-child {
  margin-top: 0;
}

/* ---- Form Groups ---- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-group-wide {
  grid-column: 1 / -1;
}

.form-group label {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.8rem;
}

.form-group input,
.form-group select {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--surface-2);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.85rem;
  transition: border-color var(--transition), background-color var(--transition);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent-blue);
  background: var(--surface-1);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.form-group input::placeholder {
  color: var(--text-muted);
}

.form-group small {
  margin-top: 0;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.section-note {
  grid-column: 4;
  align-self: end;
  padding: var(--spacing-sm);
  border: 1px dashed var(--border-light);
  border-radius: var(--radius-sm);
  background: rgba(248, 142, 48, 0.04);
  color: var(--text-secondary);
  font-size: 0.75rem;
  line-height: 1.4;
}

/* ---- Checkbox Group ---- */
.checkbox-group {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--spacing-xs);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  padding: var(--spacing-xs) 0;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition);
  font-size: 0.85rem;
}

.checkbox-label:hover {
  background: rgba(248, 142, 48, 0.05);
}

.checkbox-label input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  cursor: pointer;
  accent-color: var(--accent-green);
  flex-shrink: 0;
}

.checkbox-label input[type="checkbox"]:focus {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

/* ---- Buttons ---- */
.btn-quote {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  background: var(--accent-orange);
  border: 1px solid #d97706;
  border-radius: var(--radius-md);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-quote:hover {
  background: #ea7e1a;
  border-color: #c96a08;
}

.btn-quote:active {
  transform: scale(0.98);
}

/* ---- Summary Panel ---- */
.summary-panel {
  background: linear-gradient(135deg, var(--surface-1) 0%, var(--surface-2) 100%);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.summary-panel h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-orange);
  margin-bottom: var(--spacing-md);
}

/* ---- Cost Rows ---- */
.cost-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-xs) 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.8rem;
  gap: var(--spacing-sm);
}

.cost-row .label {
  color: var(--text-secondary);
  min-width: 0;
  flex: 1;
}

.cost-row .value {
  color: var(--text-primary);
  font-weight: 500;
  font-family: var(--font-family-mono);
  text-align: right;
  white-space: nowrap;
}

.cost-row.primary {
  border-bottom: 2px solid var(--accent-orange);
  border-top: 1px solid var(--border-light);
  padding: var(--spacing-sm) 0;
  margin: var(--spacing-md) 0 var(--spacing-sm) 0;
}

.cost-row.primary .label {
  font-weight: 600;
  color: var(--text-primary);
}

.cost-row.primary .value {
  color: var(--accent-orange);
  font-size: 0.9rem;
}

.cost-row.secondary .value {
  color: var(--accent-green);
}

.cost-row.highlight {
  background: rgba(248, 142, 48, 0.08);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  border-bottom: none;
  margin: var(--spacing-xs) -var(--spacing-md);
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.cost-row.highlight .label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.8rem;
}

.cost-row.highlight .value {
  color: var(--accent-orange);
  font-size: 0.95rem;
  font-weight: 700;
}

/* ---- Divider ---- */
.summary-panel hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: var(--spacing-sm) 0;
}

/* ---- Summary Details ---- */
.summary-details {
  background: rgba(248, 142, 48, 0.02);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  font-size: 0.75rem;
}

.summary-details p {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
  color: var(--text-secondary);
  gap: var(--spacing-sm);
}

.summary-details p:last-child {
  margin-bottom: 0;
}

.summary-details strong {
  color: var(--text-primary);
}

/* ---- Responsive ---- */
@media (max-width: 1400px) {
  .calculator-form {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .calculator-container {
    padding: var(--spacing-md);
    grid-template-columns: 1fr;
  }

  .calculator-header h1 {
    font-size: 1.5rem;
  }

  .calculator-header .lead {
    font-size: 0.85rem;
  }

  .calculator-summary {
    position: static;
    margin-top: 0;
  }

  .calculator-form {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-note {
    grid-column: 1 / -1;
    align-self: start;
  }

  .checkbox-group {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .form-section {
    grid-column: 1 / -1;
  }

  .cost-row.highlight {
    margin: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .calculator-container {
    padding: var(--spacing-md);
  }

  .calculator-header h1 {
    font-size: 1.25rem;
  }

  .calculator-header .lead {
    font-size: 0.8rem;
  }

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

  .section-note {
    grid-column: 1;
  }

  .checkbox-group {
    grid-template-columns: 1fr;
  }

  .form-group label {
    font-size: 0.75rem;
  }

  .form-group input,
  .form-group select {
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
  }

  .summary-panel {
    padding: var(--spacing-md);
  }

  .cost-row {
    font-size: 0.75rem;
  }

  .cost-row.highlight .value {
    font-size: 0.9rem;
  }
}

/* ---- Print Styles ---- */
@media print {
  body {
    background: white;
    color: black;
  }

  .calculator-container,
  .calculator-form,
  .calculator-summary {
    all: revert;
  }

  .form-section {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .btn-quote {
    display: none;
  }
}