/* ═══════════════════════════════════════════
   Fhemti Landing Page — Design System
   Mirrors fhemti/src/styles.css tokens
   ═══════════════════════════════════════════ */

/* ── Fonts ── */
/* Inter is loaded via <link> in index.html with media="print" swap trick for non-blocking load.
   Fallback: system-ui, -apple-system, sans-serif. */

/* ── Design Tokens ── */
:root {
  --color-primary:        #1E5E67;
  --color-primary-hover:  #174952;
  --color-primary-active: #0F3A42;
  --color-primary-light:  #E6F1F3;
  --color-secondary:      #D4832A;
  --color-secondary-hover:#B87022;
  --color-secondary-light:#FFF5EB;
  --color-bg:             #FAF9F6;
  --color-text:           #1A2E30;
  --color-text-muted:     #5B7A7D;
  --color-surface:        #FFFFFF;
  --color-border:         #E0DDD6;
  --color-success:        #5B8C5A;
  --color-error:          #D94A4A;

  --radius-sm: 0.5rem;
  --radius:    0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --shadow-sm: 0 1px 3px rgba(26,46,48,0.06);
  --shadow:    0 4px 12px rgba(26,46,48,0.08);
  --shadow-lg: 0 8px 30px rgba(26,46,48,0.10);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── Typography ── */
h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 4vw, 2.25rem); font-weight: 700; letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; font-weight: 600; }

/* ── Utility classes ── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}

/* Instances sits right after Hero — reduce the gap */
.hero + .section {
  padding-top: 1.5rem;
}

/* Consecutive sections — tighter spacing */
.section + .section {
  padding-top: 1.5rem;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.section-title {
  margin-bottom: 1rem;
  color: var(--color-text);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.text-center { text-align: center; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  cursor: pointer;
  border: none;
  transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
  text-align: center;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--color-primary);
  color: #FFF;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 16px rgba(30,94,103,0.3);
}

.btn-secondary {
  background: var(--color-secondary);
  color: #FFF;
}
.btn-secondary:hover {
  background: var(--color-secondary-hover);
  box-shadow: 0 4px 16px rgba(212,131,42,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary-light);
}

.btn-lg {
  padding: 0.9rem 2.25rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

/* ── Cards ── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.card-highlighted {
  border: 2px solid var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-light);
  position: relative;
}

.card-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: #FFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 1rem;
  border-radius: 999px;
  white-space: nowrap;
}

/* ── Grids ── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

/* ── Nav ── */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background: rgba(255,255,255,0.92);
}

.site-badge {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}
.site-badge:hover { color: var(--color-primary-hover); }

.lang-switcher {
  display: flex;
  gap: 0.25rem;
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 3px;
}

.lang-btn {
  padding: 0.35rem 0.7rem;
  font-size: 0.8rem;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.lang-btn:hover { color: var(--color-text); }
.lang-btn.active {
  background: var(--color-primary);
  color: #FFF;
}

/* ── Hero ── */
.hero {
  position: relative;
  padding: 3rem 1.5rem 4rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  overflow: hidden;
}

/* Language cloud (hero background) */
.lang-cloud {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 0;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  padding: 1rem 0;
}

/* Hide cloud when animations aren't supported or user prefers reduced motion */
@supports not (animation-name: test) {
  .lang-cloud { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .lang-cloud { display: none; }
}
.no-anim .lang-cloud { display: none; }

.lang-cloud-row {
  display: flex;
  gap: 1.25rem;
  white-space: nowrap;
  width: -webkit-max-content;
  width: -moz-max-content;
  width: max-content;
  -webkit-animation-name: langCloudScroll;
  animation-name: langCloudScroll;
  -webkit-animation-duration: var(--speed, 50s);
  animation-duration: var(--speed, 50s);
  -webkit-animation-timing-function: linear;
  animation-timing-function: linear;
  -webkit-animation-iteration-count: infinite;
  animation-iteration-count: infinite;
}

.lang-cloud-row.reverse {
  -webkit-animation-direction: reverse;
  animation-direction: reverse;
}

.lang-cloud-chip {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  opacity: 0.16;
  padding: 0.3rem 0.9rem;
  border: 1px solid var(--color-primary);
  border-radius: 999px;
  flex-shrink: 0;
}

@-webkit-keyframes langCloudScroll {
  0%   { -webkit-transform: translateX(0); transform: translateX(0); }
  100% { -webkit-transform: translateX(-50%); transform: translateX(-50%); }
}

@keyframes langCloudScroll {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.hero-wordmark {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.hero-logo {
  width: 72px;
  height: 72px;
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  object-fit: cover;
  flex-shrink: 0;
}

.hero-brand {
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.03em;
}

.hero-tagline {
  font-size: clamp(1.6rem, 5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-text);
  max-width: 700px;
}

.hero-tagline em {
  font-style: normal;
  color: var(--color-primary);
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 520px;
  line-height: 1.6;
}

.hero-credit {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--color-secondary-light);
  color: var(--color-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.4rem 1rem;
  border-radius: 999px;
}

/* Hero special-offer pill — glowing amber, shown only when an offer is active */
.hero-offer-banner {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.45rem 1.25rem;
  border-radius: 999px;
  margin-top: 0.65rem;
  text-decoration: none;
  box-shadow: 0 0 18px rgba(245, 158, 11, 0.35);
  animation: hero-offer-pulse 2.5s ease-in-out infinite;
}

@keyframes hero-offer-pulse {
  0%, 100% { box-shadow: 0 0 18px rgba(245, 158, 11, 0.35); }
  50%      { box-shadow: 0 0 28px rgba(245, 158, 11, 0.55); }
}

/* ── Phonetics Showcase (app mockup) ── */
.showcase-app-mockup {
  max-width: 720px;
  margin: 0 auto;
}

.showcase-input-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
}

.showcase-input-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.showcase-input-text {
  font-size: 1rem;
  color: var(--color-text);
  font-style: italic;
}

.showcase-result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow);
}

.showcase-result-header {
  margin-bottom: 0.75rem;
}

.showcase-result-lang {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary);
}

.showcase-translation-main {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.6;
  margin-bottom: 0.5rem;
  text-align: start;
}

.showcase-phonetic {
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 0.75rem;
}

.showcase-context-note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-border);
}

/* Breakdown boxes */
.showcase-breakdowns-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.showcase-breakdown-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.showcase-breakdown {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 0.85rem;
  box-shadow: var(--shadow-sm);
}

.breakdown-arabic,
.breakdown-native {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.2rem;
  line-height: 1.6;
}

.breakdown-phonetic {
  font-family: 'Courier New', monospace;
  font-size: 0.8rem;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}

.breakdown-meaning {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 0.3rem;
}

.breakdown-note {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  line-height: 1.45;
}

/* VS note */
.showcase-vs {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  background: #fef3e3;
  border: 1px solid var(--color-secondary-light);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.showcase-vs-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.showcase-vs em {
  font-style: normal;
  font-weight: 600;
  color: var(--color-primary);
}

/* ── Comparison Table ── */
.comparison-table {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.comparison-table th,
.comparison-table td {
  padding: 0.85rem 1rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
  font-weight: 700;
  color: var(--color-text);
  font-size: 0.95rem;
}

.comparison-table th:first-child,
.comparison-table td:first-child {
  text-align: left;
  font-weight: 500;
}

.comparison-table .col-fhemti {
  background: var(--color-primary-light);
  border-radius: var(--radius) var(--radius) 0 0;
}

.comparison-table .check { color: var(--color-success); font-weight: 700; }
.comparison-table .cross { color: var(--color-text-muted); }

.comparison-table tbody tr:hover {
  background: rgba(230,241,243,0.4);
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ── Value Props ── */
.value-prop {
  text-align: center;
  padding: 2rem 1.5rem;
}

.value-prop-icon {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
  display: block;
}

.value-prop h3 {
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.value-prop p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ── Emotional Hook ── */
.emotional-hook {
  background: var(--color-primary);
  color: #FFF;
  text-align: center;
  padding: 4rem 1.5rem;
  border-radius: var(--radius-xl);
  margin: 0 1.5rem;
}

.emotional-hook h2 {
  color: #FFF;
  max-width: 650px;
  margin: 0 auto 1rem;
}

.emotional-hook p {
  color: rgba(255,255,255,0.85);
  max-width: 550px;
  margin: 0 auto 1.5rem;
  font-size: 1.05rem;
  line-height: 1.7;
}

.emotional-hook .btn {
  color: var(--color-primary);
  background: #FFF;
}
.emotional-hook .btn:hover {
  background: var(--color-primary-light);
}

/* ── How It Works ── */
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 800;
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.step-card {
  text-align: center;
  padding: 2rem 1.5rem;
}

.step-card h3 {
  margin-bottom: 0.5rem;
}

.step-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ── Pricing ── */
.pricing-card {
  text-align: center;
  display: flex;
  flex-direction: column;
}

.pricing-amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-text);
  margin: 0.5rem 0 0.25rem;
}

.pricing-amount .currency {
  font-size: 1.25rem;
  font-weight: 600;
  vertical-align: super;
}

.pricing-credits {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.pricing-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  flex: 1;
}

.pricing-card .btn {
  width: 100%;
  margin-top: auto;
}

/* Offer badge on pricing cards */
.offer-badge {
  display: inline-block;
  background: var(--color-secondary-light);
  color: var(--color-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  vertical-align: middle;
  margin-left: 0.35rem;
}

/* Offer banner above pricing grid */
.offer-banner {
  background: var(--color-secondary-light);
  border: 1px solid var(--color-secondary);
  color: var(--color-secondary);
  border-radius: var(--radius-lg);
  padding: 0.85rem 1.25rem;
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

/* Strikethrough old credits */
.old-credits {
  text-decoration: line-through;
  color: var(--color-text-muted);
  font-weight: 400;
}

/* New/bonus credits */
.new-credits {
  color: var(--color-secondary);
  font-weight: 700;
}

/* Credit cost summary row */
.credit-costs-row span.cost-sep {
  color: var(--color-text-muted);
  opacity: 0.4;
}

/* ── Button flags (SEO cross-links) ── */
.btn .fi {
  margin-right: 0.25rem;
  vertical-align: middle;
  border-radius: 2px;
}

/* ── Instances ── */
.instance-card {
  text-align: center;
  padding: 1.25rem;
  transition: border-color 0.2s;
  position: relative;
}

.instance-card-link {
  text-decoration: none;
  display: flex;
  align-items: center;
  color: inherit;
}

.instance-card:hover {
  border-color: var(--color-primary);
}

.instance-flag-col {
  flex: 0 0 25%;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.instance-flag-col .fi {
  font-size: 1.5rem;
  border-radius: 3px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.08);
  line-height: 1;
}

.instance-text-col {
  flex: 1;
  text-align: center;
  min-width: 0;
}

.instance-name {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.instance-info-link {
  position: absolute;
  top: 0.4rem;
  right: 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-decoration: none;
  opacity: 0.6;
  transition: opacity 0.2s, color 0.2s;
  line-height: 1;
}

.instance-card:hover .instance-info-link {
  opacity: 0.8;
}

.instance-info-link:hover {
  opacity: 1 !important;
  color: var(--color-primary);
}

.instance-url {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ── Coming Soon ── */
.instances-coming-soon {
  text-align: center;
  margin-top: 2rem;
}

.coming-soon-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.coming-soon-chip {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border: 1px dashed var(--color-border);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  background: var(--color-bg);
}

/* ── FAQ ── */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 0;
}

.faq-q {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.35rem;
  font-size: 1rem;
}

.faq-a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.faq-grid {
  max-width: 700px;
  margin: 0 auto;
}

/* ── Footer ── */
.site-footer {
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.site-footer a {
  color: var(--color-text-muted);
  margin: 0 0.75rem;
}
.site-footer a:hover { color: var(--color-primary); }

.site-footer .footer-contact {
  margin-top: 0.75rem;
  font-size: 0.8rem;
}

/* ── Free CTA banner ── */
.free-cta {
  background: var(--color-secondary-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.free-cta strong {
  color: var(--color-secondary);
  font-size: 1.15rem;
}

.free-cta p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  max-width: 450px;
}

/* ── Content pages (privacy, terms, cv) ── */
.content {
  flex: 1;
  max-width: 720px;
  margin: 2rem auto;
  padding: 2rem;
}
.content h1 { font-size: 2rem; margin-bottom: 1rem; color: var(--color-text); }
.content h2 { font-size: 1.3rem; margin: 1.5rem 0 0.5rem; color: var(--color-text); }
.content p, .content li { margin-bottom: 0.5rem; color: var(--color-text); }
.content ul { padding-left: 1.5rem; margin-bottom: 1rem; list-style: disc; }
.content a { color: var(--color-primary); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .section { padding: 2.5rem 0; }

  .showcase-breakdown-grid {
    grid-template-columns: 1fr;
  }

  .site-nav {
    padding: 0.75rem 1rem;
  }

  .emotional-hook {
    margin: 0 0.75rem;
    border-radius: var(--radius-lg);
    padding: 2.5rem 1rem;
  }

  .comparison-table {
    font-size: 0.8rem;
  }
  .comparison-table th,
  .comparison-table td {
    padding: 0.6rem 0.5rem;
  }
}

@media (max-width: 480px) {
  .btn-group {
    flex-direction: column;
  }
  .btn-group .btn {
    width: 100%;
  }
  .hero-logo {
    width: 80px;
    height: 80px;
  }

  .site-footer {
    text-align: center;
    padding: 1.5rem 1rem;
  }
  .site-footer div {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }
  .site-footer a {
    margin: 0;
  }
}

/* ── Back to top button ── */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 100;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  color: white;
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover {
  background: var(--color-primary-hover);
}
@media (max-width: 480px) {
  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
  }
}