/* ==========================================================================
   Construction Calculator – Calculator Styles
   Loaded only on /calculators/* pages.
   Depends on design tokens from styles.css.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Page Layout: Article + Sticky Widget
   -------------------------------------------------------------------------- */
.calc-page-layout {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 48px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 max(24px, env(safe-area-inset-right)) 0 max(24px, env(safe-area-inset-left));
  align-items: start;
}

.calc-article {
  min-width: 0;
}

.calc-sidebar {
  position: sticky;
  top: calc(100px + env(safe-area-inset-top));
  align-self: start;
  padding-bottom: 48px;
}

/* --------------------------------------------------------------------------
   Calculator Widget (Glass Card)
   -------------------------------------------------------------------------- */
.calc-widget {
  background: var(--surface-card);
  border: 1px solid var(--border-card);
  border-radius: var(--card-radius);
  padding: 24px;
  box-shadow:
    0 6px 24px rgba(0, 0, 0, 0.06),
    0 0 20px rgba(0, 0, 0, 0.03),
    inset 1px 1px 0 var(--lg-highlight),
    inset 0 0 5px rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
}

.calc-widget-header {
  margin-bottom: 20px;
}

.calc-widget-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

/* --------------------------------------------------------------------------
   Unit Switcher (Segmented Control)
   -------------------------------------------------------------------------- */
.calc-unit-switcher {
  display: flex;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 3px;
  gap: 2px;
}

.calc-unit-btn {
  flex: 1;
  padding: 6px 8px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  white-space: nowrap;
}

.calc-unit-btn:hover {
  color: var(--text-primary);
}

.calc-unit-btn.active {
  background: var(--surface-card);
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 0 0 1px var(--border-subtle);
}

/* --------------------------------------------------------------------------
   Input Fields
   -------------------------------------------------------------------------- */
.calc-inputs {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.calc-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.calc-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}

.calc-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-card);
  border-radius: 12px;
  background: var(--surface-card);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 500;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.calc-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-bg);
}

.calc-input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

.calc-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%236b7280' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
  cursor: pointer;
}

/* Number input: hide spinners */
.calc-input[type="number"]::-webkit-outer-spin-button,
.calc-input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.calc-input[type="number"] {
  -moz-appearance: textfield;
}

/* Input with suffix */
.calc-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.calc-input-wrap .calc-input {
  padding-right: 48px;
}

.calc-input-suffix {
  position: absolute;
  right: 14px;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  pointer-events: none;
}

/* Pitch input: "X in 12" */
.calc-pitch-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.calc-pitch-input {
  width: 80px;
  text-align: center;
}

.calc-pitch-label {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}

.calc-field-help {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   Results Display
   -------------------------------------------------------------------------- */
.calc-results {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 4px 0;
  margin-bottom: 20px;
}

.calc-result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  gap: 12px;
}

.calc-result-row:not(:last-child) {
  border-bottom: 1px solid var(--border-faint);
}

.calc-result-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.calc-result-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.calc-result-warn {
  color: #dc2626;
}

/* --------------------------------------------------------------------------
   Diagram Container
   -------------------------------------------------------------------------- */
.calc-diagram {
  margin-bottom: 20px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 20px;
  text-align: center;
}

.calc-diagram svg {
  max-width: 100%;
  height: auto;
}

/* --------------------------------------------------------------------------
   In-Widget App CTA
   -------------------------------------------------------------------------- */
.calc-app-cta {
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.calc-cta-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: 14px;
  text-decoration: none;
  transition: background 0.2s;
}

.calc-cta-link:hover {
  background: var(--bg-hover);
}

.calc-cta-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  flex-shrink: 0;
}

.calc-cta-text {
  flex: 1;
  min-width: 0;
}

.calc-cta-text strong {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.calc-cta-text span {
  font-size: 12px;
  color: var(--text-muted);
}

.calc-cta-badge {
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Article Content Styles
   -------------------------------------------------------------------------- */
.calc-hero {
  padding: calc(120px + env(safe-area-inset-top)) 0 40px;
}

.calc-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.calc-breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
}

.calc-breadcrumbs a:hover {
  color: var(--color-accent-light);
}

.calc-breadcrumbs .sep {
  color: var(--text-faint);
}

.calc-article h1 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
}

.calc-article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.calc-article h2 {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 700;
  color: var(--text-primary);
  margin: 48px 0 16px;
  letter-spacing: -0.02em;
}

.calc-article h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 32px 0 12px;
}

.calc-article p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: 16px;
}

.calc-article ul, .calc-article ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.calc-article li {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: 8px;
}

/* Key Takeaways Box */
.calc-takeaways {
  background: var(--color-accent-bg);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 12px 12px 0;
  padding: 20px 24px;
  margin-bottom: 32px;
}

.calc-takeaways h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 12px;
}

.calc-takeaways ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.calc-takeaways li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-body);
  padding-left: 20px;
  position: relative;
  margin-bottom: 6px;
}

.calc-takeaways li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* Table of Contents */
.calc-toc {
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 20px 24px;
  margin-bottom: 32px;
}

.calc-toc h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.calc-toc ol {
  list-style: decimal;
  padding-left: 20px;
  margin: 0;
}

.calc-toc li {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 2px;
}

.calc-toc a {
  color: var(--text-body);
  text-decoration: none;
}

.calc-toc a:hover {
  color: var(--color-accent-light);
}

/* Formula Block */
.calc-formula {
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 24px;
  text-align: center;
}

.calc-formula code {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  font-family: 'Inter', monospace;
  letter-spacing: 0.01em;
}

.calc-formula .formula-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Worked Example */
.calc-example {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 24px;
}

.calc-example h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.calc-example .example-steps {
  list-style: none;
  padding: 0;
  margin: 0;
}

.calc-example .example-steps li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border-faint);
  font-size: 14px;
}

.calc-example .example-steps li:last-child {
  border-bottom: none;
}

.calc-example .example-steps strong {
  color: var(--text-primary);
}

/* Code Requirements Table */
.calc-code-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--border-card);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 24px;
  font-size: 14px;
}

.calc-code-table thead {
  background: var(--bg-subtle);
}

.calc-code-table th {
  text-align: left;
  padding: 12px 16px;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-card);
}

.calc-code-table td {
  padding: 10px 16px;
  color: var(--text-body);
  border-bottom: 1px solid var(--border-faint);
}

.calc-code-table tr:last-child td {
  border-bottom: none;
}

/* In-article CTA */
.calc-inline-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--surface-card);
  border: 1px solid var(--border-card);
  border-radius: var(--card-radius);
  padding: 24px;
  margin: 32px 0;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.calc-inline-cta img.cta-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  flex-shrink: 0;
}

.calc-inline-cta .cta-body {
  flex: 1;
}

.calc-inline-cta .cta-body strong {
  display: block;
  font-size: 16px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.calc-inline-cta .cta-body span {
  font-size: 14px;
  color: var(--text-secondary);
}

.calc-inline-cta .cta-btn {
  flex-shrink: 0;
}

/* FAQ Section */
.calc-faq {
  margin-top: 48px;
}

.calc-faq h2 {
  margin-top: 0;
}

.calc-faq-item {
  border-bottom: 1px solid var(--border-subtle);
  padding: 20px 0;
}

.calc-faq-item:first-of-type {
  border-top: 1px solid var(--border-subtle);
}

.calc-faq-q {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.calc-faq-a {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

/* --------------------------------------------------------------------------
   Calculator Hub Page
   -------------------------------------------------------------------------- */
.calc-hub-hero {
  text-align: center;
  padding: calc(120px + env(safe-area-inset-top)) 24px 48px;
}

.calc-hub-hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.calc-hub-hero p {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Hub Search */
.calc-hub-search {
  position: relative;
  max-width: 480px;
  margin: 28px auto 0;
}

.calc-hub-search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.calc-hub-search-input {
  width: 100%;
  padding: 14px 44px 14px 46px;
  border: 1px solid var(--border-card);
  border-radius: 16px;
  background: var(--surface-card);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 500;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.calc-hub-search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-bg), 0 2px 8px rgba(0, 0, 0, 0.04);
}

.calc-hub-search-input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

.calc-hub-search-clear {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: var(--bg-subtle);
  color: var(--text-secondary);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
}

.calc-hub-search-clear:hover {
  background: var(--border-card);
  color: var(--text-primary);
}

.calc-hub-search-count {
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 12px;
}

.calc-hub-section {
  max-width: var(--max-width);
  margin: 0 auto 48px;
  padding: 0 max(24px, env(safe-area-inset-right)) 0 max(24px, env(safe-area-inset-left));
}

.calc-hub-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.calc-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

.calc-hub-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--surface-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.calc-hub-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.1);
  transform: translateY(-2px);
}

.calc-hub-card-icon {
  width: 36px;
  height: 36px;
  background: var(--color-accent-bg);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-accent);
}

.calc-hub-card-icon svg {
  width: 18px;
  height: 18px;
}

.calc-hub-card-body {
  flex: 1;
  min-width: 0;
}

.calc-hub-card-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.calc-hub-card-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 2px;
}

.calc-hub-card-arrow {
  color: var(--text-faint);
  flex-shrink: 0;
  transition: color 0.2s, transform 0.2s;
}

.calc-hub-card:hover .calc-hub-card-arrow {
  color: var(--color-accent);
  transform: translateX(2px);
}

/* Coming soon state */
.calc-hub-card.coming-soon {
  opacity: 0.55;
  pointer-events: none;
}

.calc-hub-card.coming-soon .calc-hub-card-name::after {
  content: 'Soon';
  display: inline-block;
  margin-left: 8px;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  padding: 1px 6px;
  border-radius: 4px;
  vertical-align: middle;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1023px) {
  .calc-page-layout {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: calc(100px + env(safe-area-inset-top));
  }

  .calc-sidebar {
    position: relative;
    top: auto;
    max-height: none;
    order: -1; /* Widget on top on mobile */
  }
}

@media (max-width: 767px) {
  .calc-page-layout {
    padding: calc(100px + env(safe-area-inset-top)) 16px 0;
    gap: 24px;
  }

  .calc-widget {
    padding: 20px 16px;
    border-radius: 20px;
  }

  .calc-unit-switcher {
    border-radius: 8px;
  }

  .calc-unit-btn {
    font-size: 11px;
    padding: 5px 6px;
  }

  .calc-input {
    padding: 9px 12px;
    font-size: 16px; /* prevent iOS zoom */
  }

  .calc-hub-grid {
    grid-template-columns: 1fr;
  }

  .calc-hub-card {
    padding: 14px 16px;
  }

  .calc-inline-cta {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }

  .calc-article h1 {
    font-size: 26px;
  }

  .calc-code-table {
    font-size: 13px;
  }

  .calc-code-table th,
  .calc-code-table td {
    padding: 8px 12px;
  }
}

/* --------------------------------------------------------------------------
   Print
   -------------------------------------------------------------------------- */
@media print {
  .calc-sidebar {
    position: relative;
    top: auto;
  }

  .calc-app-cta,
  .calc-inline-cta,
  .calc-unit-switcher {
    display: none;
  }
}