/* ============================================================
   RetireRichCalc — main.css
   Design system: DESIGN.md
   Fonts: Noto Serif (headings) + Noto Sans (body)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif:wght@400;600;700&family=Noto+Sans:wght@400;500;600;700&display=swap');

/* ── Design Tokens ── */
:root {
  --color-navy-dark:  #0F2447;
  --color-navy:       #1B3A6B;
  --color-blue:       #2E6DA4;
  --color-blue-light: #4A90D9;
  --color-blue-pale:  #EBF2FA;
  --color-blue-faint: #F4F8FD;
  --color-red:        #C41230;
  --color-white:      #FFFFFF;
  --color-gray-50:    #F9FAFB;
  --color-gray-100:   #F3F4F6;
  --color-gray-200:   #E5E7EB;
  --color-gray-400:   #9CA3AF;
  --color-gray-600:   #4B5563;
  --color-gray-700:   #374151;
  --color-gray-900:   #111827;
  --color-green:      #16A34A;
  --color-green-pale: #DCFCE7;

  --font-serif: 'Noto Serif', Georgia, 'Times New Roman', serif;
  --font-sans:  'Noto Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --space-1: 0.25rem;  --space-2: 0.5rem;   --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem;  --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem;  --space-12: 3rem;
  --space-16: 4rem;    --space-20: 5rem;    --space-24: 6rem;

  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   20px;
  --radius-full: 9999px;

  --shadow-sm:  0 1px 2px rgba(0,0,0,.05);
  --shadow-md:  0 4px 16px rgba(0,0,0,.08);
  --shadow-lg:  0 8px 28px rgba(0,0,0,.11);
  --shadow-xl:  0 16px 48px rgba(0,0,0,.14);

  --max-width:   1100px;
  --calc-width:  920px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.45, 0, 0.55, 1);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--color-gray-900);
  background: var(--color-white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--color-blue); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; cursor: pointer; }

/* ── Skip link ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-navy-dark);
  color: var(--color-white);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  z-index: 9999;
}
.skip-link:focus { top: var(--space-3); }

/* ── Layout ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* ═══════════════════════════════════════════
   SITE HEADER
   ═══════════════════════════════════════════ */
.site-header {
  background: var(--color-navy-dark);
  border-bottom: 3px solid var(--color-blue-light);
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: var(--shadow-md);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  gap: var(--space-4);
}

/* Logo */
.site-logo {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  flex-shrink: 0;
}
.site-logo:hover { text-decoration: none; }
.logo-text {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: -0.01em;
  line-height: 1.2;
}
.logo-sub {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-blue-light);
  margin-top: 1px;
}

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.nav-link {
  font-size: 0.8125rem;
  font-weight: 600;
  color: rgba(255,255,255,.82);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
  text-decoration: none;
}
.nav-link:hover {
  color: var(--color-white);
  background: rgba(255,255,255,.1);
  text-decoration: none;
}
.nav-link.active {
  color: var(--color-white);
  background: rgba(74,144,217,.2);
  border-bottom-color: var(--color-blue-light);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: var(--space-2);
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ═══════════════════════════════════════════
   HERO — Homepage
   ═══════════════════════════════════════════ */
.hero {
  background: linear-gradient(155deg, var(--color-navy-dark) 0%, var(--color-navy) 55%, #224f8a 100%);
  padding: var(--space-16) 0 var(--space-12);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(74,144,217,.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(46,109,164,.15) 0%, transparent 50%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-blue-light);
  background: rgba(74,144,217,.15);
  border: 1px solid rgba(74,144,217,.3);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-5);
}
.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(255,255,255,.78);
  max-width: 560px;
  margin: 0 auto var(--space-10);
  line-height: 1.65;
}

/* ── Page Header (calculator pages) ── */
.page-header {
  background: linear-gradient(180deg, var(--color-navy-dark) 0%, var(--color-navy) 100%);
  padding: var(--space-10) 0 var(--space-8);
  border-bottom: 3px solid var(--color-blue-light);
}
.page-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.page-breadcrumb {
  font-size: 0.75rem;
  color: rgba(255,255,255,.5);
  margin-bottom: var(--space-3);
}
.page-breadcrumb a { color: rgba(255,255,255,.5); }
.page-breadcrumb a:hover { color: var(--color-white); }
.page-eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-blue-light);
  margin-bottom: var(--space-3);
}
.page-title {
  font-family: var(--font-serif);
  font-size: clamp(1.625rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.page-desc {
  font-size: 1rem;
  color: rgba(255,255,255,.7);
  max-width: 520px;
  line-height: 1.6;
}

/* ═══════════════════════════════════════════
   CALCULATOR LAYOUT
   ═══════════════════════════════════════════ */
.calc-section {
  background: var(--color-gray-50);
  padding: var(--space-12) 0 var(--space-16);
}
.calc-wrap {
  max-width: var(--calc-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-8);
  align-items: start;
}

/* Inputs panel */
.calc-inputs {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
}
.calc-inputs-heading {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--color-blue-pale);
}

/* Results panel */
.calc-results {
  background: var(--color-navy-dark);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-xl);
  position: sticky;
  top: 84px;
}

/* ── Input Group ── */
.input-group { margin-bottom: var(--space-7); }
.input-group:last-child { margin-bottom: 0; }

.input-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-2);
}
.input-label-text {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-gray-700);
}
.input-value-display {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-blue);
  background: var(--color-blue-pale);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  min-width: 80px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ── Slider ── */
.slider-wrap { position: relative; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
  background: var(--color-gray-200);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-navy);
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-navy), var(--shadow-md);
  cursor: pointer;
  transition: transform 0.15s var(--ease-out), box-shadow 0.15s;
}
input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-navy);
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-navy), var(--shadow-md);
  cursor: pointer;
  transition: transform 0.15s var(--ease-out);
}
input[type="range"]:hover::-webkit-slider-thumb,
input[type="range"]:focus::-webkit-slider-thumb {
  transform: scale(1.18);
  box-shadow: 0 0 0 2px var(--color-navy), 0 4px 16px rgba(27,58,107,.45);
}
input[type="range"]:hover::-moz-range-thumb {
  transform: scale(1.18);
}

.slider-minmax {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-2);
}
.slider-min, .slider-max {
  font-size: 0.7rem;
  color: var(--color-gray-400);
}

/* ── Results Panel ── */
.result-eyebrow {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-blue-light);
  margin-bottom: var(--space-3);
}
.result-primary { margin-bottom: var(--space-5); }
.result-number {
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  transition: all 0.3s var(--ease-out);
}
.result-sub {
  font-size: 0.875rem;
  color: rgba(255,255,255,.6);
  margin-top: var(--space-2);
}
.result-divider {
  height: 1px;
  background: rgba(255,255,255,.1);
  margin: var(--space-5) 0;
}
.result-stats { display: flex; flex-direction: column; gap: var(--space-4); }
.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-2);
}
.stat-label {
  font-size: 0.8125rem;
  color: rgba(255,255,255,.58);
  line-height: 1.4;
}
.stat-value {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-white);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.stat-value.accent { color: var(--color-blue-light); }
.stat-value.green  { color: #4ADE80; }

/* Progress bar */
.result-bar-section { margin-top: var(--space-5); }
.result-bar-labels {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-2);
  font-size: 0.7rem;
  color: rgba(255,255,255,.45);
}
.result-bar-track {
  height: 8px;
  background: rgba(255,255,255,.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.result-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-blue-light) 0%, #7DD3FC 100%);
  transition: width 0.5s var(--ease-out);
  min-width: 4px;
}

/* ── Share Button ── */
.btn-share {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-3) var(--space-5);
  margin-top: var(--space-6);
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--radius-md);
  color: var(--color-white);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  text-decoration: none;
}
.btn-share:hover {
  background: rgba(255,255,255,.18);
  border-color: rgba(255,255,255,.4);
  text-decoration: none;
  color: var(--color-white);
}

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  background: var(--color-navy-dark);
  color: var(--color-white);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255,255,255,.12);
  opacity: 0;
  transition: opacity 0.25s, transform 0.25s var(--ease-out);
  pointer-events: none;
  z-index: 1000;
  white-space: nowrap;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ═══════════════════════════════════════════
   HOMEPAGE — More Calculators Grid
   ═══════════════════════════════════════════ */
.more-calcs {
  background: var(--color-white);
  padding: var(--space-16) 0;
}
.section-heading {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}
.section-sub {
  font-size: 1rem;
  color: var(--color-gray-600);
  max-width: 500px;
  margin-bottom: var(--space-8);
  line-height: 1.6;
}
.calc-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.calc-card-link {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-7);
  text-decoration: none;
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s, border-color 0.2s;
  box-shadow: var(--shadow-sm);
}
.calc-card-link:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-blue-light);
  text-decoration: none;
}
.calc-card-icon {
  width: 48px;
  height: 48px;
  background: var(--color-blue-pale);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  flex-shrink: 0;
}
.calc-card-icon svg { width: 22px; height: 22px; }
.calc-card-title {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: var(--space-2);
  line-height: 1.35;
}
.calc-card-desc {
  font-size: 0.875rem;
  color: var(--color-gray-600);
  line-height: 1.55;
  flex: 1;
}
.calc-card-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-4);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-blue);
}

/* ── Trust Bar ── */
.trust-bar {
  background: var(--color-blue-pale);
  border-top: 1px solid rgba(74,144,217,.2);
  border-bottom: 1px solid rgba(74,144,217,.2);
  padding: var(--space-4) 0;
}
.trust-bar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  flex-wrap: wrap;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-navy);
}
.trust-item svg { width: 16px; height: 16px; color: var(--color-blue); flex-shrink: 0; }

/* ═══════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════ */
.site-footer {
  background: var(--color-navy-dark);
  border-top: 3px solid var(--color-blue-light);
  padding: var(--space-12) 0 var(--space-6);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-8);
}
.footer-logo { margin-bottom: var(--space-4); }
.footer-desc {
  font-size: 0.875rem;
  color: rgba(255,255,255,.55);
  line-height: 1.65;
  max-width: 280px;
}
.footer-col-title {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,.45);
  margin-bottom: var(--space-4);
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.footer-links a {
  font-size: 0.875rem;
  color: rgba(255,255,255,.6);
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--color-white); text-decoration: none; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: var(--space-5);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  flex-wrap: wrap;
}
.footer-copyright {
  font-size: 0.75rem;
  color: rgba(255,255,255,.35);
}
.footer-disclaimer {
  font-size: 0.7rem;
  color: rgba(255,255,255,.28);
  max-width: 440px;
  line-height: 1.55;
  text-align: right;
}

/* ═══════════════════════════════════════════
   AD UNIT
   ═══════════════════════════════════════════ */
.ad-unit {
  margin: var(--space-8) 0;
  text-align: center;
}
.ad-unit ins { display: block; }

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */
@media (max-width: 900px) {
  .calc-grid { grid-template-columns: 1fr; }
  .calc-results { position: static; }
  .calc-cards-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > div:first-child { grid-column: 1 / -1; }
  .footer-desc { max-width: 100%; }
}

@media (max-width: 640px) {
  .header-inner { padding: var(--space-3) var(--space-4); }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-navy-dark);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3) var(--space-4) var(--space-4);
    border-top: 1px solid rgba(255,255,255,.1);
    box-shadow: var(--shadow-lg);
    gap: var(--space-1);
  }
  .site-nav.open { display: flex; }
  .site-header { position: relative; }
  .nav-toggle { display: flex; }
  .calc-cards-grid { grid-template-columns: 1fr; }
  .calc-inputs { padding: var(--space-5); }
  .calc-results { padding: var(--space-5); }
  .footer-grid { grid-template-columns: 1fr; }
  .trust-bar-inner { gap: var(--space-4); }
  .footer-bottom { flex-direction: column; }
  .footer-disclaimer { text-align: left; }
  .hero { padding: var(--space-12) 0 var(--space-10); }
}

@media (max-width: 420px) {
  .result-number { font-size: 2.25rem; }
}