/**
 * US Home Calcs — Vanilla CSS Design Token & Component System
 * Version: 1.0.0 | Specification: ushomecalcs-trd-20261030.md (§3 & §4)
 * Architecture: 21st.dev / Modern Tailwind Inspired, Zero Runtime Dependencies
 */

/* 1. CSS CUSTOM PROPERTIES (:root TOKENS - TRD §3) */
:root {
  --bg: #E9E4D8;
  --bg-soft: #D8D2C4;
  --card-bg: #F4EFE4;
  --card-alt: #E9E4D8;
  --ink: #1E1E1E;
  --ink-secondary: #5E5A52;
  --muted: #5E5A52;
  --ink-inverted: #E6E4D7;
  --border: #D2CBBB;
  --border-hover: #5E5A52;
  --border-focus: #2E2E2E;
  --accent: #2E2E2E;
  --accent-hover: #1E1E1E;
  --accent-ink: #E6E4D7;
  --accent-subtle: #D8D2C4;
  --accent-border: #D2CBBB;
  --warning-bg: #D8D2C4;
  --warning-border: #D2CBBB;
  --warning-ink: #1E1E1E;
  --radius-card: 12px;
  --radius-input: 8px;
  --radius-pill: 9999px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-card: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-drawer: 0 -4px 12px 0 rgb(0 0 0 / 0.08);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --touch-min: 44px;
  --container-max: 720px;
  --container-hub-max: 1080px;
  --drawer-height: 68px;
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* 2. BASE & BOX MODEL */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* 3. LAYOUT & CONTAINERS */
.diy-calc-container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 16px;
  padding-right: 16px;
}

.diy-calc-hub-container {
  width: 100%;
  max-width: var(--container-hub-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 16px;
  padding-right: 16px;
}

@media (max-width: 767.98px) {
  .diy-calc-container {
    padding-left: 14px;
    padding-right: 14px;
    padding-bottom: calc(84px + env(safe-area-inset-bottom, 0px));
  }
}

/* 4. 21st.dev CARD COMPONENT */
.diy-calc-card,
.calc-card {
  width: 100%;
  max-width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-card);
  margin-bottom: 24px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

@media (max-width: 640px) {
  .diy-calc-card,
  .calc-card {
    padding: 16px;
  }
}

.diy-calc-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin: 0 0 8px 0;
}

.diy-calc-promise {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.5;
  margin: 0 0 20px 0;
}

@media (min-width: 768px) {
  .diy-calc-title {
    font-size: 36px;
  }
}

/* Typography Scale: H2 Section Headings (TRD §3) */
h2,
.diy-calc-h2,
.calc-h2,
.diy-section-title {
  font-size: 22px;
  line-height: 1.2;
  font-weight: 700;
  color: var(--ink);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

@media (min-width: 1024px) {
  h2,
  .diy-calc-h2,
  .calc-h2,
  .diy-section-title {
    font-size: 26px;
  }
}

/* 5. FORM LAYOUT & INPUT CONTROLS */
.diy-form-grid,
.calc-form-grid {
  display: flex;
  flex-direction: column;
  gap: 18px;
  width: 100%;
}

.diy-form-row-2col,
.calc-form-row-2col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  width: 100%;
}

@media (min-width: 768px) {
  .diy-form-row-2col,
  .calc-form-row-2col {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

.diy-form-row-3col,
.calc-form-row-3col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  width: 100%;
}

@media (min-width: 768px) {
  .diy-form-row-3col,
  .calc-form-row-3col {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
}

.diy-calc-field,
.diy-form-group,
.calc-form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  margin: 0;
  padding: 0;
  border: none;
}

.diy-calc-label,
.diy-label,
.calc-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
  user-select: none;
}

.diy-label-hint,
.calc-label-hint {
  font-size: 13px;
  font-weight: 400;
  color: var(--muted);
}

.diy-helper-text,
.calc-helper-text {
  font-size: 13px;
  line-height: 1.4;
  color: var(--muted);
  margin-top: 4px;
  margin-bottom: 0;
}

/* Input Group with Suffix (>= 44px hit target) */
.diy-calc-input-group,
.diy-input-group,
.calc-input-group {
  display: flex;
  align-items: stretch;
  width: 100%;
  min-height: 48px;
  height: 48px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  overflow: hidden;
}

.diy-calc-input-group:focus-within,
.diy-input-group:focus-within,
.calc-input-group:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(22, 101, 52, 0.18);
  outline: none;
}

.diy-calc-input,
.diy-input-bare,
.diy-input,
.calc-input {
  flex: 1 1 auto;
  min-width: 0;
  width: 100%;
  min-height: 44px;
  height: 100%;
  border: none;
  background: transparent;
  padding: 0 14px;
  font-family: inherit;
  font-size: 16px; /* Prevents iOS auto-zoom */
  font-weight: 500;
  color: var(--ink);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.diy-input-standalone {
  display: block;
  width: 100%;
  min-height: 48px;
  height: 48px;
  padding: 0 14px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  font-family: inherit;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.diy-input-standalone:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(22, 101, 52, 0.18);
}

.diy-calc-suffix,
.diy-input-addon,
.calc-suffix {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  background-color: var(--bg-soft);
  border-left: 1px solid var(--border);
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  user-select: none;
  pointer-events: none;
}

/* Custom Select Dropdowns */
.diy-select-wrap,
.calc-select-wrap {
  position: relative;
  width: 100%;
}

.diy-calc-select,
.diy-select,
.calc-select {
  display: block;
  width: 100%;
  min-height: 48px;
  height: 48px;
  padding: 0 40px 0 14px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  font-family: inherit;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  box-shadow: var(--shadow-sm);
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.diy-calc-select:focus,
.diy-select:focus,
.calc-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(22, 101, 52, 0.18);
  outline: none;
}

.diy-select-arrow,
.calc-select-arrow {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--muted);
  pointer-events: none;
}

/* 6. RADIO-CHIP PRESETS (Multi-Modal A11y) */
.diy-calc-chip-group,
.diy-chip-group,
.calc-chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  width: 100%;
  margin-top: 4px;
}

.diy-calc-chip-wrap,
.diy-chip,
.calc-chip {
  display: inline-flex;
  cursor: pointer;
  user-select: none;
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
}

.diy-calc-chip-input,
.diy-chip-input,
.calc-chip-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
  opacity: 0;
  pointer-events: none;
}

.diy-calc-chip,
.diy-chip-label,
.calc-chip-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  min-width: 44px;
  padding: 8px 16px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-fast);
}

.diy-calc-chip:hover,
.diy-chip:hover .diy-chip-label,
.calc-chip:hover .calc-chip-label {
  border-color: var(--border-hover);
  background-color: var(--bg-soft);
}

.diy-calc-chip-input:focus-visible + .diy-calc-chip,
.diy-chip-input:focus-visible + .diy-chip-label,
.diy-chip:has(.diy-chip-input:focus-visible) .diy-chip-label,
.calc-chip:has(.calc-chip-input:focus-visible) .calc-chip-label {
  border-color: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 3px rgba(22, 101, 52, 0.20);
}

.diy-calc-chip-input:checked + .diy-calc-chip,
.diy-calc-chip.is-active,
.diy-chip-input:checked + .diy-chip-label,
.diy-chip:has(.diy-chip-input:checked) .diy-chip-label,
.calc-chip-input:checked + .calc-chip-label,
.calc-chip:has(.calc-chip-input:checked) .calc-chip-label {
  border-color: var(--accent);
  background-color: var(--accent-subtle);
  color: var(--accent);
  font-weight: 600;
  border-width: 1.5px;
  box-shadow: 0 0 0 1px var(--accent);
}

.diy-chip-check,
.calc-chip-check {
  display: none;
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: var(--accent);
}

.diy-calc-chip-input:checked + .diy-calc-chip .diy-chip-check,
.diy-calc-chip.is-active .diy-chip-check,
.diy-chip-input:checked + .diy-chip-label .diy-chip-check,
.diy-chip:has(.diy-chip-input:checked) .diy-chip-check,
.calc-chip-input:checked + .calc-chip-label .calc-chip-check {
  display: inline-block;
}

/* 7. LIVE RESULT PANEL & BREAKDOWNS */
.diy-calc-result-panel,
.diy-result-card,
.calc-result-panel {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 20px;
  margin-top: 24px;
}

.diy-calc-result-headline,
.calc-metric-headline {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--accent);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  margin: 0 0 6px 0;
}

.diy-calc-result-sub,
.calc-metric-subline {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.4;
  margin: 0 0 16px 0;
}

.diy-calc-breakdown-list,
.calc-breakdown-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

.diy-calc-breakdown-row,
.calc-breakdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}

.diy-calc-breakdown-label,
.calc-breakdown-label {
  color: var(--ink-secondary);
}

.diy-calc-breakdown-value,
.calc-breakdown-value {
  font-weight: 600;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* Empty / Prompt State (TRD §4.2) */
.diy-calc-prompt,
.diy-result-empty,
.calc-empty-prompt {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 32px 20px;
  background-color: var(--bg-soft);
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-card);
  margin-top: 20px;
}

.diy-empty-icon {
  width: 44px;
  height: 44px;
  color: var(--muted);
  margin-bottom: 12px;
}

.diy-empty-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px 0;
}

.diy-empty-text {
  font-size: 14px;
  line-height: 1.45;
  color: var(--muted);
  margin: 0;
  max-width: 380px;
}

/* Callout Banners */
.diy-calc-callout,
.diy-callout,
.calc-callout {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border-radius: var(--radius-input);
  font-size: 14px;
  line-height: 1.45;
  margin-top: 16px;
}

.diy-calc-callout-warning,
.diy-callout-warning,
.calc-callout-warning {
  background-color: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--warning-ink);
}

.diy-callout-info {
  background-color: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e40af;
}

/* 8. SHOPPING LIST & ACTION BUTTONS */
.diy-calc-shopping-list,
.calc-shopping-list-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
  margin-top: 24px;
  margin-bottom: 24px;
}

.diy-calc-shopping-title,
.calc-shopping-list-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 16px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.diy-calc-items-list,
.calc-shopping-list-items {
  list-style: none;
  padding: 0;
  margin: 0 0 20px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.diy-calc-items-list li,
.calc-shopping-list-items li,
.diy-calc-buy-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  font-size: 15px;
  color: var(--ink);
  line-height: 1.4;
}

.diy-calc-buy-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 14px;
  white-space: nowrap;
}

/* Action Buttons (Touch Target >= 44x44px) */
.diy-calc-btn-group,
.calc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.diy-calc-btn,
.diy-btn,
.calc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  min-width: 44px;
  padding: 12px 20px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.25;
  border-radius: var(--radius-input);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  user-select: none;
  border: 1px solid transparent;
}

.diy-calc-btn-primary,
.diy-btn-primary,
.calc-btn-primary {
  background-color: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.08);
}

.diy-calc-btn-primary:hover,
.diy-btn-primary:hover,
.calc-btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
}

.diy-calc-btn-primary:focus-visible,
.diy-btn-primary:focus-visible,
.calc-btn-primary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 3px rgba(22, 101, 52, 0.25);
}

.diy-calc-btn-outline,
.diy-btn-outline,
.calc-btn-outline {
  background-color: var(--bg);
  color: var(--ink);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.diy-calc-btn-outline:hover,
.diy-btn-outline:hover,
.calc-btn-outline:hover {
  background-color: var(--bg-soft);
  border-color: var(--border-hover);
  color: var(--ink);
}

.diy-calc-btn-outline:focus-visible,
.diy-btn-outline:focus-visible,
.calc-btn-outline:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.diy-calc-btn.is-copied,
.diy-btn.is-copied,
.calc-btn.is-copied {
  background-color: var(--accent-subtle) !important;
  color: var(--accent) !important;
  border-color: var(--accent) !important;
}

@media (max-width: 640px) {
  .diy-calc-btn-group,
  .calc-actions {
    flex-direction: column;
  }

  .diy-calc-btn,
  .diy-btn,
  .calc-btn {
    width: 100%;
  }
}

/* 9. STICKY MOBILE RESULT DRAWER (<768px - TRD §4.3) */
.diy-calc-sticky-drawer,
#calc-sticky-drawer {
  display: none;
}

@media (max-width: 767.98px) {
  .diy-calc-sticky-drawer,
  #calc-sticky-drawer {
    display: block;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--bg);
    border-top: 1px solid var(--border);
    box-shadow: var(--shadow-drawer);
    transform: translateY(100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }

  .diy-calc-sticky-drawer.is-active:not(.is-dismissed),
  #calc-sticky-drawer.is-active:not(.is-dismissed) {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .diy-calc-sticky-drawer.is-dismissed,
  #calc-sticky-drawer.is-dismissed {
    display: none !important;
  }

  .diy-calc-sticky-drawer .drawer-inner,
  #calc-sticky-drawer .drawer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 16px;
    max-width: 720px;
    margin: 0 auto;
  }

  .diy-calc-sticky-drawer .drawer-info,
  #calc-sticky-drawer .drawer-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
  }

  .diy-calc-sticky-drawer .drawer-label,
  #calc-sticky-drawer .drawer-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
    line-height: 1.2;
  }

  .diy-calc-sticky-drawer .drawer-headline,
  .diy-calc-drawer-val,
  #calc-sticky-drawer .drawer-headline {
    font-size: 17px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.25;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .diy-calc-sticky-drawer .drawer-actions,
  #calc-sticky-drawer .drawer-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
  }

  .diy-calc-sticky-drawer .drawer-jump-link,
  #calc-sticky-drawer .drawer-jump-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 14px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    background-color: var(--accent);
    color: var(--accent-ink);
    border-radius: var(--radius-input);
    transition: background-color var(--transition-fast);
  }

  .diy-calc-sticky-drawer .drawer-jump-link:hover,
  .diy-calc-sticky-drawer .drawer-jump-link:focus-visible,
  #calc-sticky-drawer .drawer-jump-link:hover,
  #calc-sticky-drawer .drawer-jump-link:focus-visible {
    background-color: var(--accent-hover);
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }

  .diy-calc-drawer-close,
  .diy-calc-sticky-drawer .drawer-dismiss-btn,
  #calc-sticky-drawer .drawer-dismiss-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    padding: 0;
    background: transparent;
    border: none;
    color: var(--muted);
    font-size: 22px;
    line-height: 1;
    border-radius: var(--radius-input);
    cursor: pointer;
    transition: color var(--transition-fast), background-color var(--transition-fast);
  }

  .diy-calc-drawer-close:hover,
  .diy-calc-sticky-drawer .drawer-dismiss-btn:hover,
  #calc-sticky-drawer .drawer-dismiss-btn:hover {
    color: var(--ink);
    background-color: var(--bg-soft);
  }

  body.has-sticky-drawer {
    padding-bottom: calc(var(--drawer-height, 68px) + env(safe-area-inset-bottom, 0px)) !important;
  }
}

/* 10. HUB GRID & FAQ ACCORDIONS */
.diy-calc-hub-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
  margin-bottom: 32px;
}

@media (min-width: 640px) {
  .diy-calc-hub-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (min-width: 1024px) {
  .diy-calc-hub-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

.diy-calc-tool-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.diy-calc-tool-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.diy-calc-tool-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.diy-calc-tool-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 8px 0;
}

.diy-calc-tool-card-desc {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.45;
  margin: 0 0 16px 0;
  flex: 1;
}

.diy-calc-tool-card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.diy-calc-faq-group,
.diy-faq-group,
.faq-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  margin-top: 24px;
  margin-bottom: 24px;
}

.diy-calc-faq-item,
.diy-faq-item,
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  background: var(--bg);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.diy-calc-faq-item[open],
.diy-faq-item[open],
.faq-item[open] {
  border-color: var(--border-hover);
}

.diy-calc-faq-summary,
.diy-faq-summary,
.faq-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  padding: 14px 18px;
  font-family: inherit;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.diy-calc-faq-summary::-webkit-details-marker,
.diy-faq-summary::-webkit-details-marker,
.faq-summary::-webkit-details-marker {
  display: none;
}

.diy-calc-faq-summary::after,
.diy-faq-summary::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform var(--transition-fast);
  margin-left: 12px;
  flex-shrink: 0;
}

.diy-calc-faq-item[open] .diy-calc-faq-summary::after,
.diy-faq-item[open] .diy-faq-summary::after {
  transform: rotate(-135deg);
}

.diy-calc-faq-summary:focus-visible,
.diy-faq-summary:focus-visible,
.faq-summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.diy-calc-faq-content,
.diy-faq-content,
.faq-content {
  padding: 0 18px 16px 18px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-secondary);
}

/* 11. INK-SAVER PRINT STYLESHEET (@media print - TRD §4.3) */
.diy-calc-print-header,
.calc-print-header {
  display: none;
}

@media print {
  *, *::before, *::after {
    background: transparent !important;
    color: #000000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  body {
    font-size: 11pt !important;
    line-height: 1.4 !important;
    padding: 10mm 15mm !important;
    margin: 0 !important;
  }

  header, footer, nav,
  .site-header, .site-footer,
  .calc-form, .diy-calc-form,
  .diy-calc-input-group, .diy-input-group, .calc-input-group,
  .diy-calc-chip-group, .diy-chip-group, .calc-chip-group,
  .diy-calc-sticky-drawer, #calc-sticky-drawer,
  .diy-calc-btn-group, .calc-actions,
  .diy-calc-how, .how-it-works,
  .diy-calc-related, .related-tools-section,
  .diy-calc-faq-group, .faq-section,
  .consent-banner, #cookie-banner,
  .no-print {
    display: none !important;
  }

  .diy-calc-print-header,
  .calc-print-header {
    display: block !important;
    border-bottom: 2pt solid #000000 !important;
    padding-bottom: 8pt !important;
    margin-bottom: 14pt !important;
  }

  .diy-calc-print-title,
  .calc-print-header .print-brand {
    font-size: 16pt !important;
    font-weight: 700 !important;
    margin: 0 0 4pt 0 !important;
  }

  .diy-calc-print-meta,
  .calc-print-header .print-meta {
    font-size: 10pt !important;
    color: #444444 !important;
  }

  .diy-calc-shopping-list,
  .calc-shopping-list-card {
    border: none !important;
    padding: 0 !important;
    margin: 0 !important;
    box-shadow: none !important;
  }

  .diy-calc-shopping-title,
  .calc-shopping-list-title {
    font-size: 14pt !important;
    font-weight: 700 !important;
    margin-bottom: 8pt !important;
  }

  .diy-calc-items-list,
  .calc-shopping-list-items {
    list-style: square !important;
    margin-left: 20pt !important;
    padding: 0 !important;
  }

  .diy-calc-items-list li,
  .calc-shopping-list-items li,
  .diy-calc-buy-item {
    border: none !important;
    background: transparent !important;
    padding: 4pt 0 !important;
    font-size: 11pt !important;
    display: list-item !important;
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .diy-calc-buy-badge {
    border: 1pt solid #000000 !important;
    padding: 1pt 4pt !important;
    font-weight: bold !important;
  }

  .calc-print-disclaimer {
    display: block !important;
    margin-top: 20pt !important;
    padding-top: 8pt !important;
    border-top: 1pt solid #cccccc !important;
    font-size: 9pt !important;
    color: #555555 !important;
    font-style: italic !important;
  }
}

/* 12. REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}