/* tools.css — Tools / calculators pages.
   Requires common.css to be loaded BEFORE this file. The top nav, account
   menu, search container, sidebar overlay, hero and mobile nav/footer
   behaviour live in common.css; only tools-specific overrides are kept here. */

*, *::before, *::after { box-sizing: border-box; }
:root {
  color-scheme: light;
  --primary: #7c3aed;
  --primary-hover: #6d28d9;
}

/* ── Top nav / hero overrides (base rules are in common.css) ── */
[data-topnav] { z-index: 201; }

.hero h1 { margin-bottom: 0.5rem; }
.hero p { max-width: 500px; margin: 0 auto; }
.hero .accent { color: var(--primary); }

@media (max-width: 768px) {
  .nav-links.mobile-open { z-index: 201; }
  .hero p { font-size: 0.9375rem; }
}

.page-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem 2rem;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.tool-card {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.5rem;
  text-decoration: none;
  color: var(--foreground);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
  background: #fff;
}
.tool-card:hover {
  border-color: var(--primary);
  box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05);
  transform: translateY(-2px);
}
.tool-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}
.tool-card h3 {
  font-size: 1.125rem;
  margin: 0 0 0.5rem;
  font-weight: 600;
}
.tool-card p {
  font-size: 0.875rem;
  color: var(--foreground-light);
  margin: 0;
  line-height: 1.6;
}

.tab-bar {
  display: flex;
  gap: 0;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.tab-bar::-webkit-scrollbar { display: none; }
.tab-btn {
  flex-shrink: 0;
  padding: 0.75rem 1.5rem;
  background: none;
  border: none;
  color: var(--foreground-light);
  font-size: 0.9375rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.tab-btn:hover { color: var(--foreground); }
.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}
.tab-pane { display: none; }
.tab-pane.active { display: block; }

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}
@media (max-width: 900px) {
  .calc-layout { grid-template-columns: 1fr; }
}

.calc-card {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.25rem;
}
.calc-card h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.calc-card h2 .badge {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.125rem 0.5rem;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  opacity: 0.85;
}

.form-group { margin-bottom: 1rem; }
.form-group label {
  display: block;
  font-size: 0.8125rem;
  color: var(--foreground-light);
  margin-bottom: 0.375rem;
  font-weight: 500;
}
.form-group .input-wrap { position: relative; }
.form-group .input-wrap .prefix {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--foreground-light);
  font-size: 0.8125rem;
  pointer-events: none;
}
.form-group .input-wrap .suffix {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--foreground-light);
  font-size: 0.8125rem;
  pointer-events: none;
}
.form-group input[type="number"] {
  width: 100%;
  padding: 0.5rem 0.75rem 0.5rem 1.75rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  font-size: 0.9375rem;
  -moz-appearance: textfield;
}
.form-group input[type="number"]:focus {
  outline: none;
  border-color: var(--primary);
}
.form-group input[type="number"]::-webkit-outer-spin-button,
.form-group input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.form-group input[type="range"] {
  width: 100%;
  margin-top: 0.25rem;
}
.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.6875rem;
  color: var(--foreground-light);
  margin-top: 0.125rem;
}

.calc-btn {
  width: 100%;
  margin-top: 0.5rem;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 1rem 0;
}
.result-item {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem;
  text-align: center;
}
.result-item .ri-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--foreground-light);
  margin-bottom: 0.25rem;
}
.result-item .ri-value {
  font-size: 1.375rem;
  font-weight: 700;
}
.result-item .ri-value.primary { color: var(--primary); }
.result-item .ri-value.green { color: #059669; }
.result-item .ri-value.amber { color: #d97706; }
.result-item .ri-value.blue { color: #2563eb; }
.result-item.full { grid-column: 1 / -1; }

.chart-wrap {
  display: flex;
  justify-content: center;
  margin: 1rem 0;
  position: relative;
}
.chart-wrap canvas { max-width: 200px; max-height: 200px; }
.chart-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  pointer-events: none;
}
.chart-center .cc-label {
  font-size: 0.625rem;
  color: var(--foreground-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.chart-center .cc-value {
  font-size: 1.125rem;
  font-weight: 700;
}

.legend {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  color: var(--foreground-light);
}
.legend-item .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.table-section { margin-top: 1.25rem; }
.table-section h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.table-controls {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}
.table-controls label { font-size: 0.8125rem; color: var(--foreground-light); }
.table-controls input[type="number"] {
  width: 80px;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  font-size: 0.8125rem;
}
.table-controls select {
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  font-size: 0.8125rem;
}

.table-wrap {
  overflow-x: auto;
  max-height: 400px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}
.table-wrap table { width: 100%; border-collapse: collapse; font-size: 0.8125rem; }
.table-wrap th {
  position: sticky;
  top: 0;
  background: #fff;
  z-index: 1;
  padding: 0.5rem 0.75rem;
  text-align: right;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.table-wrap th:first-child { text-align: left; }
.table-wrap td {
  padding: 0.375rem 0.75rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
}
.table-wrap td:first-child { text-align: left; color: var(--foreground-light); }
.table-wrap tbody tr:hover td { background: var(--background-alt); }
.table-wrap tbody tr:last-child td { border-bottom: none; }

.info-section {
  margin-top: 2rem;
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}
.info-section .disclaimer {
  font-size: 0.75rem;
  color: var(--foreground-light);
  background: var(--background-alt);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}
.info-section h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
}
.info-section h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.25rem 0 0.5rem;
}
.info-section p {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--foreground);
  margin: 0 0 1rem;
}
.info-section ul {
  margin: 0.5rem 0 1rem;
  padding-left: 1.25rem;
}
.info-section li {
  font-size: 0.875rem;
  line-height: 1.7;
  margin: 0.375rem 0;
}
.info-section .formula {
  background: var(--background-alt);
  padding: 1rem;
  border-radius: 0.5rem;
  font-family: 'Courier New', monospace;
  font-size: 0.8125rem;
  line-height: 1.8;
  margin: 0.75rem 0;
  overflow-x: auto;
}
.info-section .example {
  background: var(--background-alt);
  padding: 1rem;
  border-radius: 0.5rem;
  margin: 0.75rem 0;
  font-size: 0.875rem;
  line-height: 1.7;
}

/* Sidebar Layout */
.calc-page-layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .calc-page-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.calc-sidebar {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem;
  background: #fff;
  position: sticky;
  top: 80px;
}

@media (max-width: 1024px) {
  .calc-sidebar {
    position: static;
    padding: 0.75rem;
  }
}
.sidebar-title {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--foreground-light);
  font-weight: 700;
  margin: 0 0 1rem;
}

.sidebar-menu {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  text-decoration: none;
  color: var(--foreground);
  border-radius: 0.375rem;
  font-size: 0.9375rem;
  transition: background 0.2s, color 0.2s;
}

.sidebar-link:hover {
  background: var(--background-alt);
}
.sidebar-link.active {
  background: var(--primary);
  color: #fff;
  font-weight: 500;
}
.sidebar-link .icon {
  font-size: 1.125rem;
}

@media (max-width: 480px) { .results-grid { grid-template-columns: 1fr; } }
.calc-card { min-width: 0; }
.calc-content { min-width: 0; }

/* Sidebar Accordion Mobile */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.sidebar-title { margin-bottom: 0 !important; }
.sidebar-toggle-btn {
  display: none;
  background: var(--background-alt);
  border: 1px solid var(--border);
  padding: 0.375rem 0.75rem;
  border-radius: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--foreground);
  align-items: center;
  gap: 0.375rem;
}

@media (max-width: 1024px) {
  .sidebar-toggle-btn { display: flex; }
  .sidebar-menu-wrapper {
    display: none;
  }
  .sidebar-menu-wrapper.open {
    display: block;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
  }
}

/* FAQ Section Redesign */
.faq-wrap { margin-top: 1rem; padding-top: 0; }
.faq-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--foreground);
  font-weight: 700;
}
.faq-item {
  margin-bottom: 1rem;
}
.faq-item details {
  background: var(--background-alt);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
  transition: all 0.2s ease;
}
.faq-item details[open] {
  background: #fff;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}
.faq-item summary {
  padding: 1.25rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--foreground);
  font-size: 1rem;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: '▼';
  font-size: 0.875rem;
  color: var(--foreground-light);
  transition: transform 0.3s ease;
}
.faq-item details[open] summary::after {
  transform: rotate(180deg);
  color: var(--primary);
}
.faq-item .faq-answer {
  padding: 0 1.5rem 1.5rem 1.5rem;
  font-size: 0.9375rem;
  color: var(--foreground-light);
  line-height: 1.7;
}