/* ============================================================
   LoanRig.com — Shared Design System v2
   Dark theme · Mobile-first · No external dependencies
   All CSS lives here — no exceptions.
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --bg: #121212;
  --surface: #1e1e1e;
  --surface-2: #2a2a2a;
  --border: #333;
  --text: #f0f0f0;
  --text-muted: #aaa;
  --muted: #888;
  --accent: #22c55e;
  --accent-hover: #4ade80;
  --accent-2: #f59e0b;
  --danger: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
  --max-w: 960px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }

img { max-width: 100%; height: auto; display: block; }

/* --- Typography --- */
h1 { font-size: 1.75rem; font-weight: 700; line-height: 1.25; color: #fff; }
h2 { font-size: 1.35rem; font-weight: 600; line-height: 1.3; color: #fff; margin-bottom: 0.75rem; }
h3 { font-size: 1.1rem; font-weight: 600; line-height: 1.4; color: var(--text); margin-bottom: 0.5rem; }
p  { margin-bottom: 1rem; color: #ccc; }

/* --- Layout --- */
.container { width: 100%; max-width: var(--max-w); margin: 0 auto; padding: 0 1rem; }
main, .calc-page { flex: 1; padding: 0 1rem 3rem; max-width: var(--max-w); margin: 0 auto; width: 100%; }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  background: #1a1a1a;
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1rem;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.logo:hover { color: #fff; }
.logo .accent { color: var(--accent); }
.logo-icon { font-size: 1.2rem; }

/* Main nav (desktop) */
.main-nav {
  display: none;
  gap: 1.5rem;
}
.main-nav a {
  color: #ccc;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}
.main-nav a:hover,
.main-nav a[aria-current="page"] { color: var(--accent); }

/* Legacy nav-links class */
.nav-links {
  display: none;
  list-style: none;
  gap: 1.5rem;
}
.nav-links a {
  color: #ccc;
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-links a:hover { color: var(--accent); }

/* Mobile menu toggle */
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-size: 1.2rem;
}

/* Mobile nav */
.mobile-nav {
  display: none;
  background: #1a1a1a;
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1rem 1rem;
}
.mobile-nav.open { display: block; }
.mobile-nav a {
  display: block;
  padding: 0.6rem 0;
  color: #ccc;
  font-size: 0.95rem;
  border-bottom: 1px solid #222;
}
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav a:hover { color: var(--accent); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  text-align: center;
  padding: 2.5rem 0 1.5rem;
}
.hero h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}
.hero p,
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================================
   CARDS
   ============================================================ */
.card,
.calc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.card h2,
.calc-card h2 { margin-bottom: 1rem; }

/* ============================================================
   CALCULATOR GRID (2-col on desktop)
   ============================================================ */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

/* ============================================================
   FORM INPUTS
   ============================================================ */

/* --- New-style input groups (auto-loan / compound) --- */
.input-group {
  margin-bottom: 1.25rem;
}
.input-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: #ccc;
  margin-bottom: 0.35rem;
}

.input-group input[type="text"],
.input-group input[type="number"],
.input-group select {
  width: 100%;
  padding: 0.7rem 0.85rem;
  background: var(--bg);
  border: 1px solid #444;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  font-family: var(--font);
  transition: border-color 0.2s;
  -moz-appearance: textfield;
}
.input-group input:focus,
.input-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.input-group input[type="number"]::-webkit-inner-spin-button,
.input-group input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.input-group select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23888' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  padding-right: 2.5rem;
}

/* Prefix / Suffix wrappers */
.input-with-prefix,
.input-with-suffix {
  position: relative;
  display: flex;
  align-items: center;
}
.input-with-prefix input { padding-left: 1.8rem; width: 100%; }
.input-with-suffix input { padding-right: 3rem; width: 100%; }

.prefix, .suffix {
  position: absolute;
  color: var(--muted);
  font-size: 0.95rem;
  pointer-events: none;
}
.prefix { left: 0.85rem; }
.suffix { right: 0.85rem; }

/* --- Legacy form-group (homepage/older pages) --- */
.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: #ccc;
  margin-bottom: 0.35rem;
}
.form-group input[type="number"],
.form-group input[type="text"],
.form-group select {
  width: 100%;
  padding: 0.7rem 0.85rem;
  background: var(--bg);
  border: 1px solid #444;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  font-family: var(--font);
  transition: border-color 0.2s;
  -moz-appearance: textfield;
}
.form-group input:focus,
.form-group select:focus { outline: none; border-color: var(--accent); }

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 1rem;
}

.form-hint {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

/* Legacy input-wrap */
.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.input-prefix, .input-suffix {
  position: absolute;
  color: var(--muted);
  font-size: 0.95rem;
  pointer-events: none;
}
.input-prefix { left: 0.85rem; }
.input-suffix { right: 0.85rem; }
.input-wrap input.has-prefix { padding-left: 1.7rem; }
.input-wrap input.has-suffix { padding-right: 2.5rem; }

/* Range slider */
.form-group input[type="range"] {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 3px;
  outline: none;
  margin-top: 0.5rem;
}
.form-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
}
.form-group input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  cursor: pointer;
}

/* ============================================================
   RESULTS
   ============================================================ */
.result-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.25rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}
.result-hero .result-label {
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.25rem;
}
.result-hero .result-value {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 0;
  border-bottom: 1px solid #2a2a2a;
  font-size: 0.95rem;
}
.result-row span:first-child { color: #ccc; }
.result-row span:last-child { font-weight: 600; color: var(--text); }

.result-row.total-row {
  border-bottom: none;
  border-top: 2px solid var(--accent);
  margin-top: 0.5rem;
  padding-top: 0.75rem;
}
.result-row.total-row span:last-child { color: var(--accent); font-size: 1.05rem; }

/* Legacy result grid */
.result-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.result-item {
  text-align: center;
  padding: 1rem;
  background: #161616;
  border-radius: var(--radius-sm);
  border: 1px solid #2a2a2a;
}
.result-label {
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.35rem;
}
.result-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
}
.result-value.large { font-size: 2rem; }
.result-sub {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.2rem;
}

/* ============================================================
   DONUT CHART
   ============================================================ */
.chart-container {
  width: 100%;
  max-width: 220px;
  margin: 1.5rem auto 1rem;
  text-align: center;
}
.donut-chart {
  width: 100%;
  height: auto;
}
.chart-legend {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 0.75rem;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: #ccc;
}
.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.dot-principal { background: var(--accent); }
.dot-interest { background: var(--accent-2); }

/* ============================================================
   AMORTIZATION TABLE
   ============================================================ */
.amort-card { /* extends .card */ }

.amort-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.amort-header h2 { margin-bottom: 0; }

.btn-toggle {
  background: none;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-family: var(--font);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.btn-toggle:hover {
  background: var(--accent);
  color: var(--bg);
}

.table-wrap {
  overflow-x: auto;
  margin-top: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.amort-table,
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.amort-table th,
.data-table th {
  background: #1a1a1a;
  color: #aaa;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
  padding: 0.7rem 0.85rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}
.amort-table th:first-child,
.data-table th:first-child { text-align: left; }

.amort-table td,
.data-table td {
  padding: 0.6rem 0.85rem;
  text-align: right;
  color: #ccc;
  border-bottom: 1px solid #222;
}
.amort-table td:first-child,
.data-table td:first-child { text-align: left; color: var(--text); }

.amort-table tbody tr:hover,
.data-table tbody tr:hover { background: #1a1a1a; }

.table-toggle {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--accent);
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font);
}
.table-toggle:hover { color: var(--accent-hover); }

/* ============================================================
   AFFILIATE SECTION
   ============================================================ */
.affiliate-card h2 { margin-bottom: 0.5rem; }
.affiliate-card p { font-size: 0.95rem; color: #ccc; margin-bottom: 1rem; }

.affiliate-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}
.aff-link {
  display: block;
  text-align: center;
  padding: 0.85rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: border-color 0.2s, background 0.2s;
}
.aff-link:hover {
  border-color: var(--accent);
  background: #1a2e1a;
  color: var(--text);
}

/* Legacy product cards */
.product-section { margin-bottom: 2rem; }
.product-section h2 { margin-bottom: 1rem; }
.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.product-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  transition: border-color 0.2s;
}
.product-card:hover { border-color: var(--accent); }
.product-img {
  width: 80px; height: 80px;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}
.product-info { flex: 1; }
.product-info h3 { font-size: 0.95rem; margin-bottom: 0.3rem; }
.product-info p { font-size: 0.82rem; color: var(--muted); margin-bottom: 0.5rem; }
.product-link { display: inline-block; font-size: 0.82rem; font-weight: 600; color: var(--accent); }
.product-link:hover { color: var(--accent-hover); }

/* ============================================================
   FAQ — <details> / <summary>
   ============================================================ */
.faq-card h2 { margin-bottom: 1rem; }

.faq-card details {
  border-bottom: 1px solid var(--border);
}
.faq-card details:last-of-type { border-bottom: none; }

.faq-card summary {
  padding: 1rem 0;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
}
.faq-card summary::-webkit-details-marker { display: none; }
.faq-card summary::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--accent);
  flex-shrink: 0;
  margin-left: 1rem;
  transition: transform 0.2s;
}
.faq-card details[open] summary::after { content: '−'; }
.faq-card details p {
  padding: 0 0 1rem;
  color: #ccc;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Legacy FAQ */
.faq-section { margin-top: 2rem; margin-bottom: 2rem; }
.faq-section h2 { margin-bottom: 1rem; }
.faq-item { border-bottom: 1px solid var(--border); padding: 1rem 0; }
.faq-item:last-child { border-bottom: none; }
.faq-question {
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-size: 1rem;
  font-family: var(--font);
  padding: 0;
}
.faq-question::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--accent);
  flex-shrink: 0;
  margin-left: 1rem;
}
.faq-item.open .faq-question::after { content: '−'; }
.faq-answer {
  display: none;
  padding-top: 0.75rem;
  color: #ccc;
  font-size: 0.95rem;
  line-height: 1.7;
}
.faq-item.open .faq-answer { display: block; }

/* ============================================================
   AD SLOTS
   ============================================================ */
.ad-slot,
.ad-container {
  margin: 1.5rem 0;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ============================================================
   HOMEPAGE
   ============================================================ */
.tool-categories { margin-bottom: 3rem; }
.category-section { margin-bottom: 2.5rem; }
.category-section h2 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}
.tool-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  transition: border-color 0.2s, background 0.2s;
}
.tool-card:hover { border-color: var(--accent); background: #1a2e1a; }
.tool-card .icon { font-size: 1.3rem; flex-shrink: 0; }
.tool-card-text { flex: 1; }
.tool-card-text h3 { font-size: 0.95rem; font-weight: 600; color: var(--text); margin-bottom: 0.15rem; }
.tool-card-text p { font-size: 0.8rem; color: var(--muted); margin: 0; }
.tool-card .arrow { color: #555; font-size: 1.1rem; flex-shrink: 0; transition: color 0.2s; }
.tool-card:hover .arrow { color: var(--accent); }

/* ============================================================
   BREADCRUMB
   ============================================================ */
.breadcrumb { padding: 0.75rem 0; font-size: 0.85rem; color: var(--muted); }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .separator { margin: 0 0.4rem; }

/* ============================================================
   BOOKMARK BAR
   ============================================================ */
.bookmark-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.bookmark-bar h1 { flex: 1; }
.bookmark-actions { display: flex; gap: 0.5rem; flex-shrink: 0; padding-top: 0.25rem; }
.btn-icon {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: #ccc;
  width: 38px; height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s, color 0.2s;
}
.btn-icon:hover { background: var(--surface-2); color: var(--accent); }

/* ============================================================
   TABS
   ============================================================ */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.25rem;
}
.tab-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  font-family: var(--font);
  padding: 0.6rem 1.25rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ============================================================
   RELATED TOOLS
   ============================================================ */
.related-tools { margin-bottom: 2.5rem; }
.related-tools h2 { margin-bottom: 1rem; }
.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}
.related-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: border-color 0.2s, background 0.2s;
}
.related-link:hover { border-color: var(--accent); background: #1a2e1a; color: var(--text); }
.related-link .icon { font-size: 1.2rem; flex-shrink: 0; }

/* ============================================================
   DISCLAIMER
   ============================================================ */
.disclaimer {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  background: #1a1a1a;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: background 0.2s;
}
.btn-primary:hover { background: var(--accent-hover); color: var(--bg); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: #0d0d0d;
  border-top: 1px solid var(--border);
  padding: 2rem 0 1.5rem;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1rem;
  text-align: center;
}
.footer-inner p {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 0.75rem;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}
.footer-nav a {
  font-size: 0.85rem;
  color: var(--muted);
}
.footer-nav a:hover { color: var(--accent); }

/* Legacy footer grid */
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1rem;
}
.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.75rem;
}
.footer-col p { font-size: 0.85rem; color: var(--muted); margin-bottom: 0; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.4rem; }
.footer-col ul a { font-size: 0.85rem; color: var(--muted); }
.footer-col ul a:hover { color: var(--accent); }

.footer-bottom {
  max-width: var(--max-w);
  margin: 2rem auto 0;
  padding: 1rem 1rem 0;
  border-top: 1px solid #222;
  text-align: center;
  font-size: 0.8rem;
  color: #666;
}

/* ============================================================
   404 PAGE
   ============================================================ */
.error-page { text-align: center; padding: 5rem 1rem; }
.error-page h1 { font-size: 4rem; color: var(--accent); margin-bottom: 0.5rem; }
.error-page p { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 2rem; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (min-width: 640px) {
  .form-row { grid-template-columns: 1fr 1fr; }
  .result-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
  .affiliate-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .calc-grid { grid-template-columns: 1fr 1fr; }
  h1 { font-size: 2rem; }
  .hero h1 { font-size: 2.5rem; }
}

@media (min-width: 900px) {
  .main-nav { display: flex; }
  .nav-links { display: flex; }
  .menu-toggle { display: none; }
  .result-grid { grid-template-columns: repeat(3, 1fr); }
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .related-grid { grid-template-columns: repeat(3, 1fr); }
  .tool-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(4, 1fr); }
}