/* ============================================================
   MOTOPLUTONE.COM — Composotipo (Stile unificato dalla.com)
   Layered: fonts → tokens → reset → typography → layout
            → nav → footer → utility components
   ============================================================ */

@import url('/static/fonts.css');

/* ── DESIGN TOKENS ── */
:root {
  --bg:        #F4EFE6;
  --ink:       #1C1714;
  --linen:     #7A6E63;
  --rule:      #D6CEBF;
  --accent:    #1A3A4A;
  --accent-lt: #2a5a72;

  --serif: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --sans:  'DM Sans', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --mono:  'JetBrains Mono', 'SF Mono', Menlo, monospace;

  --pad-h: 3rem;
  --pad-v: 5rem;
  --max-w: 1300px;
  --rule-thin: 1px solid var(--rule);
}

@media (max-width: 720px) {
  :root { --pad-h: 1.25rem; --pad-v: 3rem; }
}
@media (min-width: 721px) and (max-width: 1024px) {
  :root { --pad-h: 2rem; --pad-v: 4rem; }
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Grain overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  background-size: 128px;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.6;
}

img, picture, video { max-width: 100%; height: auto; display: block; }

/* ── TYPOGRAPHY ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--serif);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.005em;
  color: var(--ink);
}
h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); margin: 0 0 1.25rem; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); margin: 2.5rem 0 1.25rem; }
h3 { font-size: clamp(1.25rem, 2.2vw, 1.5rem); margin: 1.5rem 0 0.75rem; }
h4 { font-size: 1.15rem; margin: 1.25rem 0 0.5rem; }
h1 em, h2 em, h3 em { font-style: italic; color: var(--accent); }

p { margin: 0 0 1rem; max-width: 64ch; }

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: var(--rule);
  transition: color 0.2s, text-decoration-color 0.2s;
}
a:hover { color: var(--accent-lt); text-decoration-color: var(--accent-lt); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

strong { font-weight: 500; }
em { font-style: italic; }

code, pre {
  font-family: var(--mono);
  font-size: 0.9em;
}
code { background: var(--rule); padding: 0.1em 0.35em; }
pre { background: var(--rule); padding: 1rem; overflow-x: auto; margin: 1rem 0; }

hr { border: 0; border-top: var(--rule-thin); margin: 2rem 0; }

/* ── LAYOUT ── */
main {
  display: block;
  flex: 1;
}

main > section, main > article {
  padding-left: var(--pad-h);
  padding-right: var(--pad-h);
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-h);
}

.section {
  padding: var(--pad-v) var(--pad-h);
  border-top: var(--rule-thin);
}
.section:first-child { border-top: 0; }
.full-bleed { padding-left: 0 !important; padding-right: 0 !important; }

/* ── NAVBAR ── */
.topnav {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.5rem var(--pad-h);
  border-bottom: var(--rule-thin);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}

.topnav .brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.topnav .logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.topnav .logo-text {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
}
.topnav .logo-text em {
  font-style: italic;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2.25rem;
  list-style: none;
  align-items: baseline;
  padding: 0;
  margin: 0;
  flex: 1;
  justify-content: center;
}
.nav-links li { padding: 0; }
.nav-links li::before { display: none; }
.nav-links a {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--linen);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.is-active {
  color: var(--ink);
  font-weight: 500;
}

.nav-lang {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  position: relative;
}
.nav-lang summary {
  cursor: pointer;
  list-style: none;
  color: var(--accent);
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
}
.nav-lang summary::-webkit-details-marker { display: none; }
.nav-lang summary::after { content: '▾'; font-size: 0.6em; color: var(--linen); }
.nav-lang[open] summary::after { content: '▴'; }
.nav-lang-menu {
  position: absolute;
  top: calc(100% + 0.6rem);
  right: 0;
  background: var(--bg);
  border: var(--rule-thin);
  padding: 0.75rem;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, minmax(6.5rem, 1fr));
  gap: 0.2rem 0.4rem;
  font-size: 0.65rem;
  z-index: 200;
  min-width: 28rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}
@media (max-width: 768px) {
  .nav-lang-menu {
    grid-template-columns: repeat(2, minmax(6rem, 1fr));
    min-width: 16rem;
    right: 0;
  }
}
.nav-lang-menu li { padding: 0; margin: 0; }
.nav-lang-menu a {
  color: var(--linen);
  text-decoration: none;
  padding: 0.35rem 0.65rem;
  display: block;
  text-align: left;
  letter-spacing: 0.08em;
}
.nav-lang-menu a:hover, .nav-lang-menu a.is-current {
  color: var(--ink);
  background: var(--rule);
}

/* Mobile Nav Toggle */
.nav-toggle, .nav-toggle-label { display: none; }

@media (max-width: 768px) {
  .topnav {
    flex-wrap: wrap;
    padding: 1rem var(--pad-h);
    align-items: center;
  }
  .nav-toggle-label {
    display: block;
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink);
    cursor: pointer;
    margin-left: auto;
    padding: 0.35rem 0.6rem;
    border: 1px solid var(--rule);
  }
  .nav-toggle-label::before { content: 'Menu'; }
  .nav-toggle:checked ~ .nav-toggle-label::before { content: 'Chiudi'; }
  .nav-links {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    width: 100%;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: var(--rule-thin);
    justify-content: flex-start;
  }
  .nav-toggle:checked ~ .nav-links { display: flex; }
  .nav-links a { font-size: 0.85rem; }
  .nav-lang { margin-left: auto; }
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.85rem 1.75rem;
  text-decoration: none;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--bg);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  cursor: pointer;
}
.btn:hover { background: var(--accent-lt); color: var(--bg); border-color: var(--accent-lt); }
.btn .arrow { transition: transform 0.2s; display: inline-block; }
.btn:hover .arrow { transform: translateX(4px); }

.btn-ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--rule);
}
.btn-ghost:hover { background: var(--accent); color: var(--bg); border-color: var(--accent); }

/* ── EYEBROW & SECTION HEADERS ── */
.eyebrow {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--accent);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.25rem;
}
.eyebrow::before {
  content: '';
  display: block;
  width: 2rem;
  height: 1px;
  background: var(--accent);
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 300;
  line-height: 1.1;
  margin: 0;
}
.section-title em { font-style: italic; color: var(--accent); }

.section-link {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: gap 0.2s, color 0.2s;
}
.section-link:hover { gap: 0.85rem; color: var(--accent-lt); }

.breadcrumb {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--linen);
  margin: 1.5rem 0 1.25rem;
}
.breadcrumb a { color: var(--linen); text-decoration: none; }
.breadcrumb a:hover { color: var(--ink); }

/* ── HERO (dalla.com split layout) ── */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 0;
  min-height: 65vh;
  padding: 0;
  align-items: stretch;
  overflow: hidden;
  border-bottom: var(--rule-thin);
}

.hero-text {
  padding: clamp(2.5rem, 5vw, 4.5rem) clamp(1.5rem, 3vw, 3.5rem) clamp(2.5rem, 5vw, 4.5rem) var(--pad-h);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-title {
  font-family: var(--serif);
  font-size: clamp(2.75rem, 6vw, 5.25rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 1.5rem;
}
.hero-title em { font-style: italic; color: var(--accent); }

.hero-sub {
  font-size: 1rem;
  color: var(--linen);
  max-width: 44ch;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.hero-image {
  position: relative;
  background: var(--ink);
  overflow: hidden;
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  position: absolute;
  inset: 0;
}
.hero-number {
  position: absolute;
  bottom: 1.5rem;
  right: 1.75rem;
  font-family: var(--serif);
  font-size: clamp(6rem, 12vw, 12rem);
  font-weight: 300;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255,255,255,0.15);
  line-height: 1;
  pointer-events: none;
  user-select: none;
  z-index: 1;
}

@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .hero-text {
    padding: 2.5rem var(--pad-h);
    order: 2;
  }
  .hero-image {
    min-height: 40vh;
    order: 1;
  }
}

/* ── METRICS / HIGHLIGHTS STRIP ── */
.highlight-strip {
  display: flex;
  flex-wrap: wrap;
  border-bottom: var(--rule-thin);
  background: var(--bg);
}
.highlight-item {
  flex: 1 1 12rem;
  padding: 1.25rem var(--pad-h);
  border-right: var(--rule-thin);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.highlight-item:last-child { border-right: 0; }
.highlight-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--linen);
}
.highlight-val {
  font-family: var(--serif);
  font-size: 1.2rem;
  color: var(--ink);
  font-weight: 400;
}
.highlight-val em {
  font-style: italic;
  color: var(--accent);
}
@media (max-width: 720px) {
  .highlight-item { border-right: 0; border-bottom: var(--rule-thin); padding: 1rem var(--pad-h); }
}

/* ── TEXT CARDS GRID (Quaderno style) ── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0;
  border-top: var(--rule-thin);
  border-left: var(--rule-thin);
  margin-top: 1.5rem;
}
.text-card {
  padding: 2.25rem 2rem;
  border-right: var(--rule-thin);
  border-bottom: var(--rule-thin);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: background 0.2s;
  background: transparent;
}
.text-card:hover { background: rgba(214,206,191,0.3); }
.text-card-eyebrow {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--linen);
  margin: 0;
}
.text-card h3 {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 400;
  margin: 0;
  line-height: 1.2;
}
.text-card p {
  font-size: 0.92rem;
  color: var(--linen);
  line-height: 1.6;
  margin: 0;
  max-width: none;
}

/* ── PHOTO GRID (dalla.com square & overlay style) ── */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 2px;
  list-style: none;
  padding: 0;
  margin: 2rem 0;
  background: var(--rule);
}
@media (max-width: 720px) {
  .photo-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}
.photo-thumb {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  background: var(--ink);
  margin: 0;
  padding: 0;
  list-style: none;
}
.photo-thumb a {
  display: block;
  width: 100%;
  height: 100%;
  position: relative;
  text-decoration: none;
}
.photo-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.photo-thumb:hover img { transform: scale(1.05); }

.photo-thumb .photo-badge {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  padding: 0.2rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(28,23,20,0.8);
  color: #ffffff;
  border-radius: 2px;
  z-index: 2;
}

.photo-thumb .photo-title {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(28,23,20,0.9) 0%, rgba(28,23,20,0.4) 60%, transparent 100%);
  padding: 1.5rem 0.85rem 0.65rem;
  color: rgba(255,255,255,0.95);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
  margin: 0;
}
.photo-thumb:hover .photo-title { opacity: 1; }

/* ── SINGLE PHOTO / MEDIA DETAIL VIEW ── */
.photo-view {
  max-width: var(--max-w);
  margin: 0 auto;
}

.photo-view .photo-title {
  font-family: var(--serif);
  font-size: clamp(1.85rem, 4vw, 3rem);
  font-weight: 300;
  line-height: 1.1;
  margin: 0.5rem 0 1.5rem;
}

.photo-main {
  margin: 1.5rem 0 2rem;
  background: var(--ink);
  text-align: center;
  border: 1px solid var(--rule);
}
.photo-main img, .photo-main video, .photo-main iframe {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
  max-height: 75vh;
  object-fit: contain;
}
.photo-main iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  max-height: 75vh;
}

.photo-description {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--ink);
  line-height: 1.6;
  margin: 0 0 2.5rem;
  max-width: 68ch;
}

.photo-tags { margin: 2rem 0; }
.photo-tag-row {
  display: grid;
  grid-template-columns: 12rem 1fr;
  gap: 1rem 1.5rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-bottom: var(--rule-thin);
}
.photo-tags .photo-tag-row:first-child { border-top: var(--rule-thin); }
.photo-tag-row .label {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--linen);
}
.photo-tag-row .value {
  font-size: 0.95rem;
  color: var(--ink);
}
@media (max-width: 720px) {
  .photo-tag-row { grid-template-columns: 1fr; gap: 0.4rem; padding: 0.85rem 0; }
}

.photo-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: center;
  margin: 3rem 0 0;
  padding: 2rem 0;
  border-top: var(--rule-thin);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.photo-nav a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
.photo-nav a:hover { color: var(--accent-lt); }
.photo-nav .photo-prev { text-align: left; }
.photo-nav .photo-up { text-align: center; padding: 0 1rem; color: var(--linen); }
.photo-nav .photo-next { text-align: right; }
@media (max-width: 720px) {
  .photo-nav { grid-template-columns: 1fr; gap: 1rem; }
  .photo-nav .photo-prev, .photo-nav .photo-up, .photo-nav .photo-next { text-align: center; }
}

/* ── LINK LIST (numbered dalla.com style) ── */
.link-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 5rem);
}
@media (max-width: 768px) {
  .link-grid { grid-template-columns: 1fr; gap: 2rem; }
}
.link-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: var(--rule-thin);
}
.link-list li {
  padding: 0;
  margin: 0;
  border-bottom: var(--rule-thin);
}
.link-list a {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 1.25rem;
  padding: 1.1rem 0;
  text-decoration: none;
  color: var(--ink);
  transition: opacity 0.2s, color 0.2s;
}
.link-list a:hover { opacity: 0.7; color: var(--accent); }
.link-list .num {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--linen);
  letter-spacing: 0.08em;
}
.link-list .name {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 400;
  line-height: 1.3;
}
.link-list .meta {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--linen);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── CONTACT FORM (dalla.com field-based style) ── */
.contact-page {
  max-width: 780px;
  margin: 0 auto;
}
.contact-intro {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--linen);
  margin-bottom: 2.5rem;
  line-height: 1.6;
}
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.field span {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--linen);
}
.field input, .field textarea {
  background: transparent;
  border: 1px solid var(--rule);
  padding: 0.85rem 1rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink);
  border-radius: 0;
  transition: border-color 0.2s;
}
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.alert {
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  border: 1px solid;
}
.alert-success {
  background: rgba(42, 90, 114, 0.08);
  border-color: var(--accent);
  color: var(--accent);
}
.alert-error {
  background: rgba(180, 40, 40, 0.08);
  border-color: #b42828;
  color: #b42828;
}

/* ── FOOTER (dalla.com exact format) ── */
.site-footer {
  padding: 2.5rem var(--pad-h);
  border-top: var(--rule-thin);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 4rem;
}
.footer-logo {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--linen);
  text-decoration: none;
}
.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}
.footer-links a {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--linen);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--ink); }
.footer-copy {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--linen);
  letter-spacing: 0.06em;
}
.footer-disclaimer {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--linen);
  line-height: 1.7;
  max-width: 70ch;
  padding: 1.5rem var(--pad-h) 2.5rem;
  border-top: var(--rule-thin);
  margin: 0;
}

/* ── BACK TO TOP ── */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--bg);
  border: 1px solid var(--rule);
  padding: 0.6rem 1rem;
  text-decoration: none;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.3s, transform 0.3s, color 0.2s, background 0.2s;
  z-index: 50;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.back-to-top:hover { color: var(--bg); background: var(--accent); border-color: var(--accent); }