/* ============================================
   Concrete Calculator — Tool-specific styles
   Uses only CSS variables from /assets/css/style.css
   ============================================ */

/* ── Trust Chips ── */
.trust-chips {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 20px;
}
.trust-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--color-muted);
}
.trust-chip-icon {
  color: var(--color-primary);
  font-weight: 700;
}

/* ── Unit Toggle (pill) ── */
.unit-toggle {
  display: inline-flex;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 3px;
  margin-bottom: 28px;
}
.unit-toggle-btn {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  padding: 9px 24px;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.5px;
}
.unit-toggle-btn.active {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 2px 8px rgba(244, 100, 10, 0.3);
}
.unit-toggle-btn:hover:not(.active) {
  color: var(--color-text);
}

/* ── Shape Tabs ── */
.shape-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 28px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.shape-tabs::-webkit-scrollbar {
  display: none;
}
.shape-tab {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 12px 20px;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition);
  position: relative;
}
.shape-tab:hover {
  color: var(--color-text);
}
.shape-tab.active {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}
.shape-tab-icon {
  margin-right: 6px;
  font-size: 14px;
}

/* ── Input Panels ── */
.input-panel {
  display: none;
}
.input-panel.active {
  display: block;
}

/* ── Wastage Selector ── */
.wastage-section {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}
.wastage-select {
  max-width: 360px;
}

/* ── Calculate Button Row ── */
.calc-actions {
  margin-top: 28px;
}

/* ── Results Box ── */
.results-box {
  background: var(--color-surface2);
  border-left: 3px solid var(--color-yellow);
  border-radius: 10px;
  padding: 28px;
  margin-top: 36px;
  display: none;
}
.results-box.visible {
  display: block;
}
.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  transition: border-color var(--transition);
}
.result-card:hover {
  border-color: var(--color-border-hover);
}
.result-card.primary {
  border-left: 3px solid var(--color-primary);
}
.result-card-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 8px;
}
.result-card-value {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 600;
  color: var(--color-yellow);
  line-height: 1.1;
}
.result-card-unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 4px;
}

/* Bags sub-grid */
.bags-row {
  display: flex;
  gap: 16px;
  margin-top: 10px;
}
.bag-item {
  text-align: center;
  flex: 1;
}
.bag-item-value {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--color-yellow);
}
.bag-item-label {
  font-family: var(--font-body);
  font-size: 11px;
  color: var(--color-muted);
  margin-top: 2px;
}

/* Results note */
.results-note {
  font-size: 12px;
  color: var(--color-muted);
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
  line-height: 1.7;
}
.results-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 18px;
}

/* ── Inline validation error ── */
.field-error {
  font-size: 11px;
  color: var(--color-primary);
  margin-top: 4px;
  display: none;
}
.field-error.visible {
  display: block;
}
.form-input.input-error {
  border-color: var(--color-primary);
}

/* ── How-To Steps ── */
.howto-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.howto-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px;
  position: relative;
  overflow: hidden;
}
.howto-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-yellow));
}
.howto-number {
  font-family: var(--font-heading);
  font-size: 52px;
  color: var(--color-primary);
  opacity: 0.15;
  position: absolute;
  top: 10px;
  right: 18px;
  line-height: 1;
}
.howto-card h3 {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}
.howto-card p {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
}

/* ── FAQ Accordion ── */
.faq-list {
  max-width: 800px;
}
.faq-item {
  border-bottom: 1px solid var(--color-border);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: none;
  border: none;
  padding: 20px 0;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--transition);
  gap: 16px;
}
.faq-question:hover {
  color: var(--color-primary);
}
.faq-question.active {
  color: var(--color-primary);
}
.faq-chevron {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  transition: transform var(--transition);
  color: var(--color-muted);
}
.faq-question.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--color-primary);
}
.faq-answer {
  display: none;
  padding: 0 0 20px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.8;
}
.faq-answer.visible {
  display: block;
}

/* ── Ad Placeholders ── */
.ad-placeholder {
  background: var(--color-surface2);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-sm);
  margin: 0 auto;
}
.ad-leaderboard {
  width: 728px;
  height: 90px;
  max-width: 100%;
}
.ad-rectangle {
  width: 300px;
  height: 250px;
}
.ad-right {
  margin-left: auto;
  margin-right: 0;
}

/* ── Related Tools grid ── */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ── Copy feedback ── */
.copy-feedback {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-primary);
  opacity: 0;
  transition: opacity var(--transition);
  margin-right: 8px;
  align-self: center;
}
.copy-feedback.show {
  opacity: 1;
}

/* ═══════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════ */
@media (max-width: 900px) {
  .results-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .howto-grid {
    grid-template-columns: 1fr;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .results-grid {
    grid-template-columns: 1fr;
  }
  .ad-leaderboard {
    width: 320px;
    height: 50px;
  }
  .ad-rectangle {
    margin-left: auto;
    margin-right: auto;
  }
  .shape-tabs {
    gap: 0;
  }
  .shape-tab {
    padding: 10px 14px;
    font-size: 12px;
  }
  .trust-chips {
    flex-direction: column;
    gap: 8px;
  }
  .results-actions {
    justify-content: center;
    flex-wrap: wrap;
  }
  .bags-row {
    flex-direction: column;
    gap: 10px;
  }
  .bag-item {
    text-align: left;
    display: flex;
    align-items: center;
    gap: 10px;
  }
}

@media (max-width: 480px) {
  .result-card-value {
    font-size: 22px;
  }
  .bag-item-value {
    font-size: 18px;
  }
  .shape-tab {
    padding: 8px 10px;
    font-size: 11px;
  }
  .unit-toggle-btn {
    padding: 8px 16px;
    font-size: 12px;
  }
}

/* ═══════════════════════════════════════
   PRINT STYLES
   ═══════════════════════════════════════ */
@media print {
  body {
    background: #fff;
    color: #000;
  }
  .navbar,
  .footer,
  .ad-placeholder,
  .shape-tabs,
  .unit-toggle,
  .calc-actions,
  .results-actions,
  .trust-chips,
  .page-hero-badge,
  .breadcrumb,
  .nav-hamburger,
  .theme-toggle,
  .wastage-section,
  .howto-grid,
  .faq-list,
  .related-grid,
  .section-header,
  #faqSection,
  #howtoSection,
  #relatedSection,
  #adLeaderboard1,
  #adRectangle1,
  #adLeaderboard2 {
    display: none !important;
  }
  .results-box {
    display: block !important;
    border: 1px solid #ccc;
    border-left: 3px solid #F2B705;
    box-shadow: none;
  }
  .result-card {
    border: 1px solid #ddd;
    break-inside: avoid;
  }
  .result-card-value {
    color: #222;
  }
  .calculator-wrap {
    box-shadow: none;
    border: 1px solid #ccc;
  }
  .page-hero {
    background: none;
    padding: 20px 0;
  }
  .page-hero::after {
    display: none;
  }
}