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

:root {
  --blue:    #2563eb;
  --blue-bg: rgba(37, 99, 235, 0.08);
  --green:   #16a34a;
  --amber:   #b45309;
  --red:     #dc2626;

  --text:        #111827;
  --text-muted:  #6b7280;
  --border:      #e5e7eb;
  --bg:          #ffffff;
  --bg-subtle:   #f9fafb;

  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

/* ── Header ── */
header {
  padding: 2rem 1.5rem 1.75rem;
  border-bottom: 1px solid var(--border);
  text-align: center;
}

header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

header p {
  color: var(--text-muted);
  margin-top: 0.25rem;
  font-size: 0.9375rem;
}

/* ── Main layout ── */
main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

/* ── Calculator grid ── */
.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* ── Panels ── */
.panel {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--text);
}

/* ── Inputs ── */
.input-group {
  margin-bottom: 1rem;
}

.input-group:last-child {
  margin-bottom: 0;
}

.input-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.375rem;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.875rem;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.prefix {
  position: absolute;
  left: 0.75rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  pointer-events: none;
  user-select: none;
}

input[type="number"] {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9375rem;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
  appearance: textfield;
  -moz-appearance: textfield;
}

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

.input-wrapper input[type="number"] {
  padding-left: 1.625rem;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px var(--blue-bg);
}

.inflation-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--blue);
  background: var(--blue-bg);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  margin-left: 0.375rem;
  vertical-align: middle;
}

.inflation-badge.fallback {
  color: #b45309;
  background: #fef3c7;
}

/* ── Result cards ── */
.result-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.125rem 1.25rem;
  margin-bottom: 0.875rem;
  box-shadow: var(--shadow);
}

.result-card:last-of-type {
  margin-bottom: 0;
}

.result-card.primary {
  border-color: var(--blue);
}

.result-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.result-value {
  font-size: 1.875rem;
  font-weight: 700;
  margin: 0.25rem 0 0.125rem;
  letter-spacing: -0.02em;
}

.result-card.primary .result-value {
  color: var(--blue);
}

.result-sub {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* ── Summary banner ── */
.summary {
  margin-top: 1rem;
  padding: 0.875rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  line-height: 1.6;
  min-height: 2.5rem;
}

.summary.on-track {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: var(--green);
}

.summary.behind {
  background: #fffbeb;
  border: 1px solid #fde68a;
  color: var(--amber);
}

.summary.warning {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--red);
}

/* ── Chart ── */
.chart-section {
  margin-top: 2rem;
}

.chart-container {
  position: relative;
  height: 360px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

/* ── Footer ── */
footer {
  text-align: center;
  padding: 1.75rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.8125rem;
  border-top: 1px solid var(--border);
}

/* ════════════════════════════════════════════════
   INDEX PAGE — site-level components
   (fire-calculator.html uses the rules above;
    index.html uses the rules below)
   ════════════════════════════════════════════════ */

/* ── Nav (multiple links) ── */
.site-header nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link[aria-current="page"] {
  background: var(--blue-bg);
  color: var(--blue);
}

/* ── Page title (calculator pages with site-header) ── */
.page-title {
  text-align: center;
  padding: 0 0 1.25rem;
}

.page-title h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-title p {
  color: var(--text-muted);
  margin-top: 0.25rem;
  font-size: 0.9375rem;
}

/* ── Result card state variants ── */
.result-card.survives { border-color: var(--green); }
.result-card.survives .result-value { color: var(--green); }
.result-card.depletes { border-color: var(--red); }
.result-card.depletes .result-value { color: var(--red); }

/* ── SS comparison ── */
.ss-comparison {
  margin-top: 0.875rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.ss-comparison h3 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.comparison-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  padding: 0.375rem 0;
  border-bottom: 1px solid var(--border);
}

.comparison-row:last-child { border-bottom: none; }
.comparison-label { color: var(--text-muted); }
.comparison-value.good { color: var(--green); font-weight: 600; }
.comparison-value.bad  { color: var(--red);   font-weight: 600; }

/* ── Site nav header ── */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 3.5rem;
  border-bottom: 1px solid var(--border);
  /* override calculator's centered header */
  text-align: left;
}

.nav-logo {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

.nav-logo:hover { color: var(--blue); }

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.375rem 0.75rem;
  border-radius: 6px;
  transition: background 0.12s, color 0.12s;
}

.nav-link:hover {
  background: var(--bg-subtle);
  color: var(--text);
}

/* ── Home main ── */
.home-main {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
}

.hero-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--text);
}

.hero-sub {
  margin-top: 1rem;
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

/* ── CTA buttons ── */
.cta-group {
  display: flex;
  gap: 0.875rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.375rem;
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: opacity 0.15s, box-shadow 0.15s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 1px 4px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover { opacity: 0.9; box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35); }

.btn-secondary {
  background: var(--bg);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(.btn-disabled) { border-color: #9ca3af; color: var(--text); }

.btn-disabled {
  opacity: 0.6;
  cursor: default;
  pointer-events: none;
}

.coming-soon-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

/* ── Stats strip ── */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.stat-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--blue);
}

.stat-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  margin-top: 0.25rem;
}

.stat-source {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ── How it works ── */
.how-section { padding-bottom: 1rem; }

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.75rem;
  color: var(--text);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.step {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.step-number {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
}

.step-body {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── Site footer ── */
.site-footer {
  text-align: center;
  padding: 1.75rem 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.site-footer a {
  color: var(--blue);
  text-decoration: none;
}

.site-footer a:hover { text-decoration: underline; }

/* ── SEO Content (calculator pages) ── */
.seo-content {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.seo-section {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
}

.seo-section h2 {
  font-size: 1.1875rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  color: var(--text);
}

.seo-section p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 0.875rem;
}

.seo-section p:last-child { margin-bottom: 0; }

/* ── How-to steps ── */
.how-to-steps {
  list-style: none;
  counter-reset: step-counter;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.how-to-steps li {
  counter-increment: step-counter;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.how-to-steps li::before {
  content: counter(step-counter);
  min-width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.how-to-steps li strong { color: var(--text); }

/* ── FAQ ── */
.faq-list {
  display: flex;
  flex-direction: column;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}

.faq-item:first-child { padding-top: 0; }
.faq-item:last-child  { border-bottom: none; padding-bottom: 0; }

.faq-item dt {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.faq-item dd {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-left: 0;
}

/* ── Blog grid ── */
.blog-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.blog-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.blog-card:hover {
  border-color: #9ca3af;
  box-shadow: var(--shadow);
}

.blog-card-body {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.blog-card-title {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 0;
}

.blog-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.blog-card-footer {
  border-top: 1px solid var(--border);
  padding-top: 0.875rem;
}

.blog-read-more {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
}

.blog-read-more:hover { text-decoration: underline; }

/* ── Responsive ── */
@media (max-width: 720px) {
  /* calculator page */
  header { padding: 1.5rem 1rem 1.25rem; }
  header h1 { font-size: 1.4rem; }
  main { padding: 1.25rem 1rem 2rem; }
  .calculator-grid { grid-template-columns: 1fr; gap: 1rem; }
  .input-row { grid-template-columns: 1fr; gap: 0; }
  .input-row .input-group { margin-bottom: 1rem; }
  .result-value { font-size: 1.5rem; }
  .chart-container { height: 280px; padding: 0.875rem; }

  /* calculator page title */
  .page-title { padding: 0 0 1rem; }
  .page-title h1 { font-size: 1.4rem; }

  /* seo content */
  .seo-section { padding: 1.25rem 1.25rem; }

  /* index page */
  .site-header { padding: 0 1rem; }
  .home-main { padding: 0 1rem 3rem; }
  .hero { padding: 2.5rem 0 2rem; }
  .stats-strip { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; gap: 1.25rem; }
  .cta-group { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
}