/* RockAuto Savings Research - Shared Architecture */
:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-subtle: #f1f5f9;
  --color-text-primary: #0f172a;
  --color-text-secondary: #334155;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-border-subtle: #cbd5e1;
  --color-brand-dark: #0f172a;
  --color-brand-blue: #0284c7;
  --color-brand-blue-hover: #0369a1;
  --color-brand-blue-bg: #f0f9ff;
  --color-confirmed-bg: #dcfce7;
  --color-confirmed-text: #15803d;
  --color-confirmed-border: #86efac;
  --color-mixed-bg: #fef3c7;
  --color-mixed-text: #b45309;
  --color-mixed-border: #fcd34d;
  --color-unconfirmed-bg: #f1f5f9;
  --color-unconfirmed-text: #475569;
  --color-unconfirmed-border: #cbd5e1;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --container-max-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-sans); font-size: 1rem; line-height: 1.65; color: var(--color-text-secondary); background-color: var(--color-bg); -webkit-font-smoothing: antialiased; }
.container { width: 100%; max-width: var(--container-max-width); margin: 0 auto; padding: 0 1.5rem; }
.site-header { background-color: var(--color-brand-dark); color: #ffffff; border-bottom: 1px solid rgba(255, 255, 255, 0.1); padding: 1rem 0; }
.header-inner { display: flex; justify-content: space-between; align-items: center; }
.site-brand { display: flex; align-items: center; gap: 0.75rem; text-decoration: none; color: #ffffff; }
.brand-badge { background-color: var(--color-brand-blue); color: #ffffff; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; padding: 0.2rem 0.5rem; border-radius: var(--radius-sm); }
.brand-name { font-size: 1.1rem; font-weight: 600; letter-spacing: -0.01em; }
.meta-tag { font-size: 0.8125rem; color: #94a3b8; font-family: var(--font-mono); }
.site-nav-links { display: flex; gap: 1.5rem; }
.site-nav-links a { color: #cbd5e1; text-decoration: none; font-size: 0.9rem; font-weight: 500; transition: color 0.15s ease; }
.site-nav-links a:hover { color: #ffffff; }
@media (max-width: 640px) { .site-nav-links { gap: 1rem; font-size: 0.85rem; } }
.hero-section { background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%); color: #ffffff; padding: 3.5rem 0 3rem; border-bottom: 1px solid var(--color-border); }
.hero-container { margin-bottom: 2.5rem; }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 2.5rem; align-items: center; margin-bottom: 2.5rem; }
.hero-image { display: flex; justify-content: center; }
.hero-image img { width: 100%; max-width: 420px; height: auto; border-radius: var(--radius-lg); box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.4); }
@media (min-width: 992px) {
  .hero-grid { grid-template-columns: 1fr 420px; }
  .hero-image { justify-content: flex-end; }
}
.hero-header { max-width: 900px; margin-bottom: 0; }
.topic-pill { display: inline-flex; align-items: center; gap: 0.4rem; background-color: rgba(2, 132, 199, 0.2); color: #38bdf8; border: 1px solid rgba(56, 189, 248, 0.3); font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; padding: 0.25rem 0.65rem; border-radius: 9999px; margin-bottom: 1.25rem; }
.hero-title { font-size: clamp(1.6rem, 3.2vw, 2.35rem); font-weight: 700; line-height: 1.25; color: #ffffff; letter-spacing: -0.02em; margin-bottom: 1.25rem; }
.hero-lead { font-size: 1.125rem; line-height: 1.6; color: #cbd5e1; }
.key-facts-panel { background-color: #ffffff; border-radius: var(--radius-lg); border: 1px solid var(--color-border); color: var(--color-text-primary); padding: 1.5rem 1.75rem; box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.15); }
.panel-header { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1.25rem; padding-bottom: 0.75rem; border-bottom: 2px solid var(--color-border); color: var(--color-brand-blue-hover); }
.panel-header h2 { font-size: 1.15rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em; color: var(--color-text-primary); }
.facts-grid { list-style: none; display: flex; flex-direction: column; gap: 0.85rem; }
.fact-item { display: flex; flex-direction: column; gap: 0.15rem; padding-left: 1.15rem; position: relative; }
.fact-item::before { content: "•"; position: absolute; left: 0; top: 0; color: var(--color-brand-blue); font-weight: 700; }
.fact-full { padding-top: 0.85rem; margin-top: 0.15rem; border-top: 1px dashed var(--color-border); }
.fact-label { font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em; color: var(--color-text-muted); }
.fact-value { font-size: 0.95rem; color: var(--color-text-primary); font-weight: 500; }

@media (min-width: 640px) {
  .fact-item { flex-direction: row; align-items: baseline; gap: 0.5rem; flex-wrap: wrap; }
  .fact-label { min-width: 165px; flex-shrink: 0; }
}
.page-content { padding-top: 3rem; padding-bottom: 4rem; }
.content-block { margin-bottom: 3.5rem; }
.section-heading { margin-bottom: 1.5rem; }
.section-heading h2, .content-block h2 { font-size: 1.5rem; font-weight: 700; color: var(--color-text-primary); letter-spacing: -0.015em; margin-bottom: 0.75rem; }
.section-lead { font-size: 1.05rem; color: var(--color-text-secondary); line-height: 1.6; max-width: 960px; }
.meta-status-bar { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.85rem; font-size: 0.875rem; color: var(--color-text-muted); }
.text-slate-light { color: #94a3b8; }
.status-indicator { width: 8px; height: 8px; border-radius: 50%; background-color: var(--color-confirmed-text); }
.table-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); overflow: hidden; }
.table-responsive { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.data-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.9375rem; }
.data-table th { background-color: var(--color-surface-subtle); color: var(--color-text-primary); font-weight: 600; font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.04em; padding: 0.875rem 1rem; border-bottom: 1px solid var(--color-border); white-space: nowrap; }
.data-table td { padding: 0.875rem 1rem; border-bottom: 1px solid var(--color-border); vertical-align: middle; }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background-color: rgba(2, 132, 199, 0.02); }
.col-code { min-width: 190px; }
.col-action { width: 90px; }
.col-expires { min-width: 110px; }
.col-evidence { min-width: 320px; }
.code-badge { font-family: var(--font-mono); font-size: 0.9375rem; font-weight: 700; color: var(--color-brand-dark); letter-spacing: 0.02em; background-color: #f1f5f9; padding: 0.25rem 0.5rem; border-radius: var(--radius-sm); border: 1px solid var(--color-border); }
.btn-copy { display: inline-flex; align-items: center; justify-content: center; gap: 0.35rem; background-color: var(--color-surface); border: 1px solid var(--color-border-subtle); color: var(--color-text-secondary); font-size: 0.8125rem; font-weight: 600; padding: 0.35rem 0.7rem; border-radius: var(--radius-sm); cursor: pointer; transition: all 0.15s ease-in-out; min-height: 34px; }
.btn-copy:hover { background-color: var(--color-brand-blue); color: #ffffff; border-color: var(--color-brand-blue); }
.btn-copy:focus-visible { outline: 2px solid var(--color-brand-blue); outline-offset: 2px; }
.btn-copy.copied { background-color: var(--color-confirmed-text); color: #ffffff; border-color: var(--color-confirmed-text); }
.cell-expires { font-family: var(--font-mono); font-size: 0.875rem; color: var(--color-text-secondary); white-space: nowrap; }
.cell-evidence { line-height: 1.45; }
.status-pill { display: inline-block; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; padding: 0.15rem 0.45rem; border-radius: var(--radius-sm); margin-right: 0.4rem; }
.status-confirmed { background-color: var(--color-confirmed-bg); color: var(--color-confirmed-text); border: 1px solid var(--color-confirmed-border); }
.status-mixed { background-color: var(--color-mixed-bg); color: var(--color-mixed-text); border: 1px solid var(--color-mixed-border); }
.status-unconfirmed { background-color: var(--color-unconfirmed-bg); color: var(--color-unconfirmed-text); border: 1px solid var(--color-unconfirmed-border); }
.evidence-text { font-size: 0.875rem; color: var(--color-text-secondary); }
.table-footnote { margin-top: 1rem; font-size: 0.875rem; color: var(--color-text-secondary); line-height: 1.55; display: flex; flex-direction: column; gap: 0.6rem; }
.editorial-panel { background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 2rem; box-shadow: var(--shadow-sm); }
.editorial-panel p + p { margin-top: 1rem; }
.section-transition { font-weight: 500; color: var(--color-text-primary); border-top: 1px solid var(--color-border); padding-top: 1rem; }
.calculation-callout { background-color: #f8fafc; border-left: 4px solid var(--color-brand-blue); border-top: 1px solid var(--color-border); border-right: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); border-radius: 0 var(--radius-md) var(--radius-md) 0; padding: 1.25rem 1.5rem; margin: 1.5rem 0; }
.calc-badge { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-brand-blue); margin-bottom: 0.35rem; }
.editorial-subpanel { display: flex; flex-direction: column; gap: 1rem; }
.priority-list { display: flex; flex-direction: column; gap: 1rem; margin: 1.5rem 0; }
.priority-card { display: flex; gap: 1.25rem; background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 1.25rem 1.5rem; box-shadow: var(--shadow-sm); }
.priority-num { flex-shrink: 0; width: 32px; height: 32px; background-color: var(--color-brand-dark); color: #ffffff; font-weight: 700; font-size: 0.95rem; display: flex; align-items: center; justify-content: center; border-radius: 50%; }
.priority-body h3 { font-size: 1.05rem; font-weight: 700; color: var(--color-text-primary); margin-bottom: 0.35rem; }
.priority-body p { font-size: 0.9375rem; line-height: 1.55; color: var(--color-text-secondary); }
.note-box { background-color: #fffbeb; border: 1px solid #fde68a; border-radius: var(--radius-md); padding: 1.25rem 1.5rem; margin: 1.5rem 0; color: #92400e; }
.note-title { display: flex; align-items: center; gap: 0.4rem; font-weight: 700; font-size: 0.9375rem; margin-bottom: 0.35rem; color: #78350f; }
.note-box p { font-size: 0.9375rem; line-height: 1.55; color: #92400e; }
.mt-4 { margin-top: 1rem; }
.troubleshooting-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; margin-bottom: 1.5rem; }
.troubleshoot-card { background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 1.25rem; box-shadow: var(--shadow-sm); }
.troubleshoot-header { display: flex; align-items: center; gap: 0.5rem; color: var(--color-brand-blue); margin-bottom: 0.5rem; }
.troubleshoot-header h3 { font-size: 1rem; font-weight: 700; color: var(--color-text-primary); }
.troubleshoot-card p { font-size: 0.875rem; color: var(--color-text-secondary); line-height: 1.5; }
.fallback-callout { background-color: var(--color-brand-blue-bg); border: 1px solid #bae6fd; border-radius: var(--radius-md); padding: 1rem 1.25rem; font-size: 0.9375rem; color: #0369a1; }
.faq-accordion { display: flex; flex-direction: column; gap: 0.75rem; }
.faq-item { background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-sm); }
.faq-question { display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.25rem; font-weight: 600; font-size: 1rem; color: var(--color-text-primary); cursor: pointer; list-style: none; user-select: none; }
.faq-question::-webkit-details-marker { display: none; }
.faq-chevron { transition: transform 0.2s ease; color: var(--color-text-muted); flex-shrink: 0; }
.faq-item[open] .faq-chevron { transform: rotate(180deg); }
.faq-answer { padding: 0 1.25rem 1.25rem; font-size: 0.9375rem; color: var(--color-text-secondary); line-height: 1.6; }
.trust-section { background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 2rem; box-shadow: var(--shadow-sm); }
.trust-header { display: flex; align-items: center; gap: 0.6rem; color: var(--color-brand-blue); margin-bottom: 0.75rem; }
.trust-header h2 { margin-bottom: 0; }
.trust-status-list { list-style-type: none; margin: 1.25rem 0; display: flex; flex-direction: column; gap: 0.6rem; }
.trust-status-list li { padding-left: 1.25rem; position: relative; font-size: 0.9375rem; }
.trust-status-list li::before { content: "•"; position: absolute; left: 0; color: var(--color-brand-blue); font-weight: bold; }
.trust-summary-panel { background-color: var(--color-surface-subtle); border-radius: var(--radius-sm); padding: 1.25rem; margin-top: 1.5rem; border-left: 3px solid var(--color-brand-dark); }
.inline-cta-panel { margin-top: 1.25rem; }
.editorial-link-btn { display: inline-flex; align-items: center; gap: 0.5rem; background-color: var(--color-surface-subtle); color: var(--color-brand-blue-hover); border: 1px solid var(--color-border); padding: 0.65rem 1rem; border-radius: var(--radius-md); text-decoration: none; font-weight: 600; font-size: 0.9375rem; transition: all 0.15s ease-in-out; }
.editorial-link-btn:hover { background-color: var(--color-brand-blue); color: #ffffff; border-color: var(--color-brand-blue); }
.editorial-link-btn svg { transition: transform 0.15s ease; }
.editorial-link-btn:hover svg { transform: translateX(3px); }
.warning-callout { background-color: #fff1f2; border-left: 4px solid #e11d48; border-top: 1px solid #fecdd3; border-right: 1px solid #fecdd3; border-bottom: 1px solid #fecdd3; border-radius: 0 var(--radius-md) var(--radius-md) 0; padding: 1.25rem 1.5rem; margin: 1.5rem 0; color: #9f1239; }
.warning-header { display: flex; align-items: center; gap: 0.45rem; font-size: 0.9375rem; font-weight: 700; margin-bottom: 0.35rem; color: #881337; }
.warning-callout p { font-size: 0.9375rem; line-height: 1.55; color: #9f1239; }
.copy-toast { position: fixed; bottom: 2rem; right: 2rem; background-color: var(--color-brand-dark); color: #ffffff; padding: 0.75rem 1.25rem; border-radius: var(--radius-md); font-size: 0.875rem; font-weight: 500; box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2); transform: translateY(100px); opacity: 0; visibility: hidden; transition: all 0.25s ease-in-out; z-index: 9999; }
.copy-toast.show { transform: translateY(0); opacity: 1; visibility: visible; }
.site-footer { background-color: var(--color-brand-dark); color: #94a3b8; border-top: 1px solid rgba(255, 255, 255, 0.1); padding: 2.5rem 0; font-size: 0.8125rem; line-height: 1.6; }
.footer-content { max-width: 900px; }
.footer-nav-links { display: flex; flex-wrap: wrap; gap: 0.85rem 1.5rem; margin-bottom: 1rem; }
.footer-nav-links a { color: #cbd5e1; text-decoration: none; font-size: 0.875rem; font-weight: 500; }
.footer-nav-links a:hover { color: #ffffff; }
@media (max-width: 768px) {
  .hero-section { padding: 2.25rem 0 2rem; }
  .key-facts-panel { padding: 1.25rem; }
  .facts-grid { grid-template-columns: 1fr; }
  .editorial-panel, .trust-section { padding: 1.25rem; }
  .priority-card { flex-direction: column; gap: 0.75rem; }
  .btn-copy { width: 100%; min-height: 44px; }
  .copy-toast { left: 1rem; right: 1rem; bottom: 1rem; text-align: center; }
}