/* ============================================
   Quick-Calculators.com — Design System
   Aesthetic: Bright Business-Chique
   Purple/blue/green accents on white
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Outfit:wght@300;400;500;600;700&display=swap');

/* --- Tokens --- */
:root {
  /* Base palette — clean and bright */
  --bg-deep: #ffffff;
  --bg-surface: #f7f8fc;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f2f8;
  --bg-input: #f5f6fa;

  /* Text — high contrast */
  --text-primary: #111827;
  --text-secondary: #4b5063;
  --text-muted: #7d829a;
  --text-inverse: #ffffff;

  /* Accent colors — purple, blue, green */
  --rainbow-1: #4f46e5;  /* indigo */
  --rainbow-2: #0ea5e9;  /* sky blue */
  --rainbow-3: #10b981;  /* emerald */
  --rainbow-4: #7c3aed;  /* violet */
  --rainbow-5: #6366f1;  /* purple-blue */

  /* Functional gradients */
  --gradient-rainbow: linear-gradient(
    135deg,
    var(--rainbow-4) 0%,
    var(--rainbow-1) 30%,
    var(--rainbow-2) 60%,
    var(--rainbow-3) 100%
  );

  --gradient-rainbow-subtle: linear-gradient(
    135deg,
    rgba(79, 70, 229, 0.06) 0%,
    rgba(14, 165, 233, 0.06) 50%,
    rgba(16, 185, 129, 0.06) 100%
  );

  --gradient-rainbow-glow: linear-gradient(
    135deg,
    rgba(79, 70, 229, 0.2) 0%,
    rgba(14, 165, 233, 0.2) 50%,
    rgba(16, 185, 129, 0.2) 100%
  );

  /* Borders & surfaces */
  --border-light: #e5e7ee;
  --border-hover: #d0d3de;
  --glass-border: var(--border-light);
  --glass-blur: 20px;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Typography */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'Outfit', system-ui, sans-serif;

  --text-xs: 0.8rem;
  --text-sm: 0.938rem;
  --text-base: 1.0625rem;
  --text-lg: 1.2rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.625rem;
  --text-3xl: 2.25rem;
  --text-4xl: 3rem;
  --text-5xl: 3.75rem;

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 500ms;
}

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

html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--text-primary);
  background-color: var(--bg-deep);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Subtle ambient color wash — dreamy touch on white */
body::after {
  content: '';
  position: fixed;
  top: -40%;
  left: -30%;
  width: 160%;
  height: 160%;
  background:
    radial-gradient(ellipse at 15% 10%, rgba(79, 70, 229, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 20%, rgba(14, 165, 233, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 90%, rgba(16, 185, 129, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
  animation: ambientDrift 30s ease-in-out infinite alternate;
}

@keyframes ambientDrift {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-2%, 1%) scale(1.02); }
  100% { transform: translate(1%, -1%) scale(0.98); }
}

/* --- Typography --- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }

p {
  color: var(--text-secondary);
  line-height: 1.75;
}

a {
  color: var(--rainbow-1);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
  color: var(--rainbow-4);
}

/* --- Layout --- */
.site-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.narrow-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* --- Navigation --- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: var(--space-md) 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--border-light);
}

.site-nav .site-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.site-logo .logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient-rainbow);
  transition: transform var(--duration-base) var(--ease-out);
}

.site-logo:hover .logo-mark {
  transform: scale(1.1);
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--text-xl);
  cursor: pointer;
  padding: var(--space-xs);
}

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--duration-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: var(--gradient-rainbow);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out);
}

.card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(79, 70, 229, 0.06);
}

.card:hover::before {
  opacity: 0.6;
}

/* --- Calculator Card --- */
.calculator-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  position: relative;
  box-shadow: 0 4px 24px rgba(79, 70, 229, 0.04);
}

.calculator-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-xl);
  padding: 1.5px;
  background: var(--gradient-rainbow);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.4;
}

/* --- Form Elements --- */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.02em;
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  transition: all var(--duration-fast) var(--ease-out);
  outline: none;
}

.form-input:focus,
.form-select:focus {
  border-color: var(--rainbow-1);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
  background: #fff;
}

.form-input::placeholder {
  color: var(--text-muted);
}

.input-wrapper {
  position: relative;
}

.input-suffix {
  position: absolute;
  right: var(--space-lg);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: var(--text-sm);
  pointer-events: none;
}

/* --- Range slider --- */
.form-range {
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--border-light);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  margin: var(--space-sm) 0;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--gradient-rainbow);
  cursor: pointer;
  border: 2px solid #fff;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-out);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--gradient-rainbow);
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
  box-shadow: 0 6px 24px rgba(79, 70, 229, 0.3);
  transform: translateY(-1px);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-rainbow);
  filter: brightness(1.15);
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-out);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary span {
  position: relative;
  z-index: 1;
}

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

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
}

.btn-lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}

/* Sticky CTA */
.sticky-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-top: 1px solid var(--border-light);
  z-index: 90;
  transform: translateY(100%);
  transition: transform var(--duration-base) var(--ease-out);
}

.sticky-cta.visible {
  transform: translateY(0);
}

.sticky-cta .btn {
  width: 100%;
}

/* --- Result display --- */
.result-display {
  text-align: center;
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  background: var(--gradient-rainbow-subtle);
  border: 1px solid var(--border-light);
  margin: var(--space-xl) 0;
}

.result-display .result-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.result-display .result-value {
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  color: var(--text-primary);
  line-height: 1;
}

.result-display .result-sub {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-top: var(--space-sm);
}

/* --- Chart container --- */
.chart-container {
  margin: var(--space-xl) 0 0;
  text-align: center;
  overflow: hidden;
}

.chart-container canvas {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.chart-title {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

/* --- Accordion --- */
.accordion {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
}

.accordion-item {
  border-bottom: 1px solid var(--border-light);
}

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-card);
  border: none;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: background var(--duration-fast) var(--ease-out);
}

.accordion-trigger:hover {
  background: var(--bg-surface);
}

.accordion-trigger .chevron {
  width: 20px;
  height: 20px;
  transition: transform var(--duration-base) var(--ease-out);
  flex-shrink: 0;
  color: var(--text-muted);
}

.accordion-item.open .accordion-trigger .chevron {
  transform: rotate(180deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-base) var(--ease-out);
}

.accordion-content-inner {
  padding: 0 var(--space-xl) var(--space-xl);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Comparison Table --- */
.comparison-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.comparison-table th {
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
  letter-spacing: 0.02em;
  border-bottom: 1px solid var(--border-light);
}

.comparison-table td {
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
  color: var(--text-secondary);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table tr:hover td {
  background: var(--bg-surface);
}

/* --- Tier badges --- */
.tier-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  border-radius: 100px;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.tier-badge.tier-1 {
  background: rgba(79, 70, 229, 0.08);
  color: var(--rainbow-1);
}

.tier-badge.tier-2 {
  background: rgba(14, 165, 233, 0.08);
  color: var(--rainbow-2);
}

.tier-badge.tier-3 {
  background: rgba(16, 185, 129, 0.08);
  color: var(--rainbow-3);
}

/* --- "Read also" blocks --- */
.read-also {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin: var(--space-xl) 0;
}

.read-also-item {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--duration-base) var(--ease-out);
}

.read-also-item:hover {
  background: var(--bg-surface);
  transform: translateX(4px);
  border-color: var(--border-hover);
}

.read-also-item .arrow {
  color: var(--text-muted);
  transition: color var(--duration-fast) var(--ease-out);
}

.read-also-item:hover .arrow {
  color: var(--rainbow-1);
}

/* --- Section spacing --- */
.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

.section-header p {
  font-size: var(--text-lg);
  max-width: 600px;
}

/* --- Footer --- */
.site-footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  border-top: 1px solid var(--border-light);
  margin-top: var(--space-3xl);
  background: var(--bg-surface);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand p {
  font-size: var(--text-sm);
  max-width: 300px;
}

.footer-links h4 {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-sm);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-light);
  font-size: var(--text-xs);
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* --- Page hero --- */
.page-hero {
  padding: var(--space-3xl) 0 var(--space-xl);
  text-align: center;
}

.page-hero h1 {
  margin-bottom: var(--space-md);
}

.page-hero .subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* Rainbow underline */
.rainbow-underline {
  position: relative;
  display: inline;
}

.rainbow-underline::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-rainbow);
  border-radius: 2px;
  opacity: 0.7;
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-in {
  animation: fadeInUp var(--duration-slow) var(--ease-out) both;
}

.animate-in-delay-1 { animation-delay: 100ms; }
.animate-in-delay-2 { animation-delay: 200ms; }
.animate-in-delay-3 { animation-delay: 300ms; }
.animate-in-delay-4 { animation-delay: 400ms; }
.animate-in-delay-5 { animation-delay: 500ms; }
.animate-in-delay-6 { animation-delay: 600ms; }

/* --- Responsive --- */
@media (max-width: 768px) {
  html {
    font-size: 16px;
  }

  :root {
    --text-4xl: 2.125rem;
    --text-5xl: 2.625rem;
    --text-3xl: 1.625rem;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border-light);
    padding: var(--space-lg);
    gap: var(--space-md);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .calculator-card {
    padding: var(--space-lg);
  }

  .read-also {
    grid-template-columns: 1fr;
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .page-hero {
    padding: var(--space-2xl) 0 var(--space-lg);
  }
}

@media (min-width: 769px) {
  .read-also {
    grid-template-columns: 1fr 1fr;
  }
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.text-gradient {
  background: var(--gradient-rainbow);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

/* --- Calculator Dropdown Menu --- */
.calc-menu-wrapper {
  position: relative;
}

.calc-menu-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.calc-menu-trigger:hover {
  color: var(--text-primary);
}

.calc-menu-chevron {
  transition: transform var(--duration-fast) var(--ease-out);
}

.calc-menu-dropdown.open + .calc-menu-trigger .calc-menu-chevron,
.calc-menu-wrapper:has(.calc-menu-dropdown.open) .calc-menu-chevron {
  transform: rotate(180deg);
}

.calc-menu-dropdown {
  position: absolute;
  top: calc(100% + var(--space-sm));
  right: 0;
  min-width: 280px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 40px rgba(79, 70, 229, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
  padding: var(--space-sm);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
  transition: all var(--duration-fast) var(--ease-out);
  z-index: 110;
}

.calc-menu-dropdown.open {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}

.calc-menu-group {
  padding: var(--space-xs) 0;
}

.calc-menu-group + .calc-menu-group {
  border-top: 1px solid var(--border-light);
  margin-top: var(--space-xs);
  padding-top: var(--space-sm);
}

.calc-menu-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: var(--space-xs) var(--space-md);
  margin-bottom: var(--space-xs);
}

.calc-menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--duration-fast) var(--ease-out);
}

.calc-menu-item:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
}

.calc-menu-item.active {
  background: var(--gradient-rainbow-subtle);
  color: var(--text-primary);
  font-weight: 500;
}

.calc-menu-emoji {
  font-size: 1em;
  width: 1.5em;
  text-align: center;
  flex-shrink: 0;
}

/* On mobile: hide dropdown, show hamburger list instead */
@media (max-width: 768px) {
  .calc-menu-wrapper {
    display: none;
  }
}

/* On desktop: hide nav-links (hamburger list), use dropdown */
@media (min-width: 769px) {
  .nav-links {
    display: none !important;
  }

  .nav-toggle {
    display: none;
  }
}

/* --- Language Switcher Button --- */
.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: 100px;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.lang-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.lang-btn-flag {
  font-size: 1.1em;
}

.lang-btn-name {
  display: none;
}

@media (min-width: 480px) {
  .lang-btn-name {
    display: inline;
  }
}

/* --- Language Overlay --- */
.lang-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-out);
}

.lang-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.lang-overlay-inner {
  width: 90%;
  max-width: 640px;
  max-height: 80vh;
  overflow-y: auto;
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: 0 24px 80px rgba(79, 70, 229, 0.1);
  transform: scale(0.95) translateY(10px);
  transition: transform var(--duration-base) var(--ease-out);
}

.lang-overlay.open .lang-overlay-inner {
  transform: scale(1) translateY(0);
}

.lang-overlay-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}

.lang-overlay-header h3 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
}

.lang-overlay-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-xs);
  transition: color var(--duration-fast) var(--ease-out);
}

.lang-overlay-close:hover {
  color: var(--text-primary);
}

/* --- Language Grid --- */
.lang-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
}

@media (min-width: 480px) {
  .lang-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.lang-grid-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  transition: all var(--duration-fast) var(--ease-out);
  position: relative;
}

.lang-grid-item:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
}

.lang-grid-item.active {
  background: var(--gradient-rainbow-subtle);
  color: var(--text-primary);
  font-weight: 500;
}

.lang-grid-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 25%;
  bottom: 25%;
  width: 2px;
  background: var(--gradient-rainbow);
  border-radius: 1px;
}

.lang-grid-item.unavailable {
  opacity: 0.35;
  cursor: default;
}

.lang-grid-item.unavailable:hover {
  background: none;
  color: var(--text-secondary);
}

.lang-grid-flag {
  font-size: 1.2em;
  flex-shrink: 0;
}

.lang-grid-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lang-grid-soon {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-left: auto;
  font-style: italic;
}