/* ==========================================================================
   TibCal.com — Universal Calculator Component System (tc-)
   BEM-styled, responsive, accessible, mobile-first shared calculator stylesheet.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Calculator Layout Container
   -------------------------------------------------------------------------- */
.calculator-layout,
.tc-calculator-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}

@media (min-width: 768px) {
  .calculator-layout,
  .tc-calculator-layout {
    grid-template-columns: 3fr 2fr;
    align-items: start;
  }

  .tc-calculator-layout--wide-form {
    grid-template-columns: 3fr 2fr;
  }
}

/* --------------------------------------------------------------------------
   Calculator Card & Header
   -------------------------------------------------------------------------- */
.tc-calculator-card,
.tc-calculator {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.tc-calculator-card__title,
.tc-calculator__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  line-height: 1.35;
  color: var(--color-text-main);
  margin-bottom: var(--space-2);
}

.tc-calculator__header {
  margin-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border-light);
  padding-bottom: var(--space-4);
}

.tc-calculator__subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Form & Field Grouping
   -------------------------------------------------------------------------- */
.tc-calculator__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.tc-calculator__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 640px) {
  .tc-calculator__grid--2col {
    grid-template-columns: repeat(2, 1fr);
  }
}

.tc-calculator__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.tc-calculator__field--full {
  grid-column: 1 / -1;
}

/* Labels & Hints */
.tc-calculator__label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.tc-calculator__label-optional {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  font-weight: var(--font-weight-regular);
}

/* Input Wrapper & Units */
.tc-calculator__input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.tc-calculator__unit {
  position: absolute;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  padding: 0 var(--space-3);
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  user-select: none;
}

.tc-calculator__unit--prefix {
  left: 0;
  border-right: none;
  border-top-left-radius: var(--radius-md);
  border-bottom-left-radius: var(--radius-md);
}

.tc-calculator__unit--suffix {
  right: 0;
  border-left: none;
  border-top-right-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}

/* Form Controls */
.tc-calculator__input,
.tc-calculator__select {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  color: var(--color-text-main);
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  appearance: none;
}

.tc-calculator__input-wrapper--has-prefix .tc-calculator__input {
  padding-left: 2.75rem;
}

.tc-calculator__input-wrapper--has-suffix .tc-calculator__input {
  padding-right: 2.75rem;
}

.tc-calculator__input:hover,
.tc-calculator__select:hover {
  border-color: #94a3b8;
}

.tc-calculator__input:focus,
.tc-calculator__select:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 var(--focus-ring-width) rgba(37, 99, 235, 0.2);
}

.tc-calculator__select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23475569'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.25rem 1.25rem;
  padding-right: 2.5rem;
}

/* --------------------------------------------------------------------------
   Standard Form Controls & Unit Selectors (.tc-form-group, .tc-input, etc.)
   -------------------------------------------------------------------------- */
.tc-form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2, 0.5rem);
  margin-bottom: var(--space-4, 1rem);
}

.tc-label {
  font-size: var(--font-size-sm, 0.875rem);
  font-weight: var(--font-weight-medium, 500);
  color: var(--color-text-main, #0f172a);
  display: block;
}

.tc-input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-2, 0.5rem);
  width: 100%;
}

.tc-input {
  flex: 1;
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: var(--font-size-base, 1rem);
  font-family: var(--font-family-base, inherit);
  color: var(--color-text-main, #0f172a);
  background-color: var(--color-bg-surface, #ffffff);
  border: 1px solid var(--color-border, #cbd5e1);
  border-radius: var(--radius-md, 0.375rem);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  min-height: 42px;
  box-sizing: border-box;
}

.tc-input:hover {
  border-color: #94a3b8;
}

.tc-input:focus {
  border-color: var(--color-primary, #2563eb);
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.tc-select,
.tc-unit-select {
  padding: 0.625rem 2.25rem 0.625rem 0.875rem;
  font-size: var(--font-size-base, 1rem);
  font-family: var(--font-family-base, inherit);
  color: var(--color-text-main, #0f172a);
  background-color: var(--color-bg-surface, #ffffff);
  border: 1px solid var(--color-border, #cbd5e1);
  border-radius: var(--radius-md, 0.375rem);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23475569'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.25rem 1.25rem;
  appearance: none;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  min-height: 42px;
  box-sizing: border-box;
}

.tc-select {
  width: 100%;
}

.tc-unit-select {
  flex-shrink: 0;
  min-width: 140px;
  max-width: 220px;
  background-color: var(--color-bg-subtle, #f8fafc);
}

.tc-select:hover,
.tc-unit-select:hover {
  border-color: #94a3b8;
}

.tc-select:focus,
.tc-unit-select:focus {
  border-color: var(--color-primary, #2563eb);
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

/* Range & Checkbox Controls */
.tc-calculator__range {
  width: 100%;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.tc-calculator__radio-group,
.tc-calculator__checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-1);
}

.tc-calculator__radio-label,
.tc-calculator__checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-main);
  cursor: pointer;
}

/* Help & Validation Messages */
.tc-calculator__help {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  margin-top: var(--space-1);
}

.tc-calculator__error {
  font-size: var(--font-size-xs);
  color: var(--color-error);
  font-weight: var(--font-weight-medium);
  margin-top: var(--space-1);
  display: none;
}

.tc-calculator__field--error .tc-calculator__input,
.tc-calculator__field--error .tc-calculator__select {
  border-color: var(--color-error);
  background-color: var(--color-error-bg);
}

.tc-calculator__field--error .tc-calculator__error {
  display: block;
}

/* --------------------------------------------------------------------------
   Action Buttons
   -------------------------------------------------------------------------- */
.tc-calculator__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.tc-calculator__calculate {
  flex: 2;
  min-width: 140px;
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  transition: background-color 0.15s ease;
}

.tc-calculator__calculate:hover {
  background-color: var(--color-primary-hover);
}

.tc-calculator__calculate:disabled,
.tc-calculator__calculate--loading {
  opacity: 0.7;
  cursor: not-allowed;
}

.tc-calculator__reset {
  flex: 1;
  min-width: 100px;
  background-color: var(--color-bg-subtle);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.tc-calculator__reset:hover {
  background-color: #e2e8f0;
  border-color: var(--color-text-light);
}

/* --------------------------------------------------------------------------
   Results Display System
   -------------------------------------------------------------------------- */
.tc-results {
  background-color: var(--color-primary-light);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.tc-results--hidden {
  display: none !important;
}

.tc-results__header {
  border-bottom: 1px solid #dbeafe;
  padding-bottom: var(--space-3);
}

.tc-results__title {
  font-size: var(--font-size-lg);
  color: #1e40af;
  margin-bottom: 0;
}

/* Primary Result Card */
.tc-results__primary {
  background-color: var(--color-bg-surface);
  border: 1px solid #93c5fd;
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  text-align: center;
}

.tc-results__primary-label {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
  display: block;
}

.tc-results__primary-value {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: #1e3a8a;
  font-family: var(--font-family-mono);
  line-height: 1.1;
}

/* Secondary Results Grid */
.tc-results__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-3);
}

.tc-results__item {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

.tc-results__label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  display: block;
  margin-bottom: var(--space-1);
}

.tc-results__value {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-main);
  font-family: var(--font-family-mono);
}

.tc-results__explanation {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
  border-top: 1px solid #dbeafe;
  padding-top: var(--space-3);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Universal Content Sections (Formula, Worked Examples, Tips, FAQ)
   -------------------------------------------------------------------------- */
.tc-calculator-content,
.tc-calculator-faq,
.tc-content-section {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-bottom: var(--space-8);
  box-shadow: var(--shadow-sm);
}

.tc-content-section:empty {
  display: none !important;
}

.tc-calculator-content h2,
.tc-calculator-faq__title,
.tc-content-section__title {
  font-size: var(--font-size-xl);
  color: var(--color-text-main);
  margin-top: var(--space-6);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border-light);
}

.tc-calculator-content h2:first-child,
.tc-calculator-faq__title:first-child {
  margin-top: 0;
}

.tc-calculator-content h3 {
  font-size: var(--font-size-lg);
  color: var(--color-text-main);
  margin-top: var(--space-5);
  margin-bottom: var(--space-3);
}

.tc-calculator-content p,
.tc-content-section__lead {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
}

.tc-calculator-content ul,
.tc-calculator-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
}

.tc-calculator-content li {
  margin-bottom: var(--space-2);
}

/* Data & Comparison Tables inside Content */
.tc-content-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  font-size: var(--font-size-sm);
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.tc-content-table th,
.tc-content-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}

.tc-content-table th {
  background-color: var(--color-bg-subtle);
  color: var(--color-text-main);
  font-weight: var(--font-weight-semibold);
}

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

.tc-formula-box {
  background-color: var(--color-bg-subtle);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-4) var(--space-5);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-base);
  color: var(--color-text-main);
  margin: var(--space-4) 0;
}

.tc-example-box {
  background-color: #f8fafc;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-4) 0;
}

.tc-faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .tc-faq-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.tc-faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.tc-faq-item {
  border-bottom: 1px solid var(--color-border-light);
  padding-bottom: var(--space-4);
}

.tc-faq-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.tc-faq-question {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-main);
  margin-bottom: var(--space-2);
}

.tc-faq-answer {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Results Action Buttons (Copy, Print, Share)
   -------------------------------------------------------------------------- */
.tc-results__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid #dbeafe;
}

.tc-btn-action {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family-base);
  color: #1e40af;
  background-color: var(--color-bg-surface);
  border: 1px solid #93c5fd;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.tc-btn-action:hover {
  background-color: #dbeafe;
  color: #1e3a8a;
  border-color: #60a5fa;
}

.tc-btn-action:active {
  transform: translateY(1px);
}

.tc-btn-action svg {
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Dynamic Result Card Variations (.tc-result-card, .tc-result-value, etc.)
   -------------------------------------------------------------------------- */
.tc-result-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4, 1rem);
}

.tc-result-title {
  font-size: var(--font-size-lg, 1.125rem);
  font-weight: var(--font-weight-semibold, 600);
  color: #1e40af;
  margin-bottom: 0;
  border-bottom: 1px solid #dbeafe;
  padding-bottom: var(--space-3, 0.75rem);
}

.tc-result-primary {
  background-color: var(--color-bg-surface, #ffffff);
  border: 1px solid #93c5fd;
  border-radius: var(--radius-md, 0.375rem);
  padding: var(--space-4, 1rem) var(--space-5, 1.25rem);
  text-align: center;
}

.tc-result-value {
  font-size: var(--font-size-3xl, 1.875rem);
  font-weight: var(--font-weight-bold, 700);
  color: #1e3a8a;
  font-family: var(--font-family-mono, monospace);
  line-height: 1.1;
  display: block;
}

.tc-result-unit {
  font-size: var(--font-size-sm, 0.875rem);
  color: var(--color-text-muted, #64748b);
  margin-top: var(--space-1, 0.25rem);
  display: block;
}

.tc-result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-3, 0.75rem);
}

.tc-result-item {
  background-color: var(--color-bg-surface, #ffffff);
  border: 1px solid var(--color-border-light, #e2e8f0);
  border-radius: var(--radius-sm, 0.25rem);
  padding: var(--space-3, 0.75rem);
  display: flex;
  flex-direction: column;
  gap: var(--space-1, 0.25rem);
}

.tc-result-label {
  font-size: var(--font-size-xs, 0.75rem);
  color: var(--color-text-muted, #64748b);
  font-weight: var(--font-weight-medium, 500);
}

.tc-result-subvalue {
  font-size: var(--font-size-base, 1rem);
  font-weight: var(--font-weight-semibold, 600);
  color: var(--color-text-main, #0f172a);
}