/* ── Variables ───────────────────────────────────────────── */
:root {
  --bg: #080811;
  --bg-2: #0e0e1c;
  --bg-3: #13132a;
  --card: rgba(255,255,255,0.04);
  --card-border: rgba(255,255,255,0.07);
  --primary: #6d28d9;
  --primary-light: #8b5cf6;
  --primary-glow: rgba(109,40,217,0.35);
  --accent: #0ea5e9;
  --accent-glow: rgba(14,165,233,0.3);
  --text: #f1f5f9;
  --text-muted: #64748b;
  --success: #10b981;
  --danger: #f43f5e;
  --warning: #f59e0b;
  --radius: 14px;
}

/* ── Global ──────────────────────────────────────────────── */
html, body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
}

/* Bootstrap dark overrides */
[data-bs-theme="dark"] {
  --bs-body-bg: var(--bg);
  --bs-body-color: var(--text);
  --bs-border-color: var(--card-border);
  --bs-card-bg: var(--card);
}

.text-muted { color: var(--text-muted) !important; }

/* ── Navbar ──────────────────────────────────────────────── */
.navbar-glass {
  background: rgba(8,8,17,0.85) !important;
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--card-border);
}

.navbar-brand-logo {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.nav-link { color: #94a3b8 !important; transition: color .2s; }
.nav-link:hover { color: var(--text) !important; }

.balance-badge {
  background: linear-gradient(135deg, rgba(109,40,217,0.3), rgba(14,165,233,0.2));
  border: 1px solid rgba(109,40,217,0.4);
  color: var(--primary-light);
  font-size: .8rem;
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 600;
}

/* ── Hero ────────────────────────────────────────────────── */
.hero-section {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-mesh {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 80% at 15% 50%, rgba(109,40,217,0.28) 0%, transparent 55%),
    radial-gradient(ellipse 50% 60% at 85% 15%, rgba(14,165,233,0.18) 0%, transparent 55%),
    radial-gradient(ellipse 60% 50% at 55% 90%, rgba(139,92,246,0.12) 0%, transparent 55%),
    var(--bg);
  animation: mesh-breathe 10s ease-in-out infinite;
}

@keyframes mesh-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: .75; }
}

.hero-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 48px 48px;
}

.text-gradient {
  background: linear-gradient(135deg, #a78bfa, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(109,40,217,0.2);
  border: 1px solid rgba(109,40,217,0.4);
  color: #a78bfa;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .5px;
}

.btn-primary-glow {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border: none;
  color: #fff;
  padding: 14px 32px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  transition: all .3s;
  box-shadow: 0 0 30px var(--primary-glow);
}
.btn-primary-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px var(--primary-glow), 0 8px 24px rgba(0,0,0,.3);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  padding: 13px 28px;
  border-radius: 12px;
  font-weight: 500;
  transition: all .25s;
}
.btn-ghost:hover {
  border-color: rgba(109,40,217,.5);
  color: var(--text);
  background: rgba(109,40,217,.08);
}

.trust-badges { gap: 32px; }
.trust-item { color: var(--text-muted); font-size: .85rem; }
.trust-item i { color: var(--primary-light); font-size: 1.1rem; }

/* ── Category Cards ──────────────────────────────────────── */
.cat-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  transition: all .3s;
  text-decoration: none;
  color: var(--text);
  display: block;
  overflow: hidden;
  position: relative;
}
.cat-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity .3s;
}
.cat-card:hover {
  transform: translateY(-4px);
  border-color: rgba(109,40,217,.5);
  box-shadow: 0 8px 32px rgba(109,40,217,.2);
  color: var(--text);
}
.cat-card:hover::before { opacity: .06; }
.cat-card .cat-icon {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, rgba(109,40,217,.25), rgba(14,165,233,.15));
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  color: var(--primary-light);
  margin: 0 auto 12px;
  transition: all .3s;
}
.cat-card:hover .cat-icon {
  background: linear-gradient(135deg, rgba(109,40,217,.5), rgba(14,165,233,.3));
  box-shadow: 0 0 20px var(--primary-glow);
}

/* ── Product Cards ───────────────────────────────────────── */
.product-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all .3s;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  transform: translateY(-5px);
  border-color: rgba(109,40,217,.45);
  box-shadow: 0 12px 40px rgba(109,40,217,.18), 0 0 0 1px rgba(109,40,217,.15);
}
.product-img {
  height: 200px;
  object-fit: cover;
  width: 100%;
}
.product-img-wrap {
  position: relative;
  overflow: hidden;
}
.product-img-wrap::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 60px;
  background: linear-gradient(transparent, rgba(8,8,17,.6));
}
.product-body {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.product-cat {
  font-size: .72rem;
  color: var(--primary-light);
  text-transform: uppercase;
  letter-spacing: .8px;
  font-weight: 600;
}
.product-name {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: .9rem;
  line-height: 1.4;
  display: block;
  margin: 4px 0 auto;
}
.product-name:hover { color: var(--primary-light); }
.product-price { font-size: 1.15rem; font-weight: 700; color: var(--text); }
.product-old-price { color: var(--text-muted); text-decoration: line-through; font-size: .82rem; }
.badge-discount {
  background: linear-gradient(135deg, var(--danger), #c2185b);
  color: #fff;
  font-size: .7rem;
  padding: 3px 8px;
  border-radius: 6px;
  font-weight: 700;
}
.badge-stock-out {
  background: rgba(100,116,139,.25);
  color: var(--text-muted);
  border: 1px solid rgba(100,116,139,.3);
  font-size: .7rem;
  padding: 3px 8px;
  border-radius: 6px;
}
.badge-digital {
  background: rgba(14,165,233,.15);
  color: var(--accent);
  border: 1px solid rgba(14,165,233,.25);
  font-size: .68rem;
  padding: 2px 8px;
  border-radius: 6px;
  font-weight: 600;
  letter-spacing: .5px;
  text-transform: uppercase;
}
.btn-add-cart {
  background: linear-gradient(135deg, rgba(109,40,217,.3), rgba(14,165,233,.2));
  border: 1px solid rgba(109,40,217,.35);
  color: var(--primary-light);
  border-radius: 8px;
  padding: 7px 14px;
  font-size: .82rem;
  font-weight: 600;
  transition: all .25s;
  white-space: nowrap;
}
.btn-add-cart:hover {
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 0 20px var(--primary-glow);
}

/* ── Section titles ──────────────────────────────────────── */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--primary-light);
  margin-bottom: 8px;
}
.section-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -.4px;
}

/* ── Glass Card ──────────────────────────────────────────── */
.glass-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
}

/* ── Forms ───────────────────────────────────────────────── */
.form-control, .form-select {
  background: rgba(255,255,255,.06) !important;
  border: 1px solid var(--card-border) !important;
  color: var(--text) !important;
  border-radius: 10px;
}
.form-control:focus, .form-select:focus {
  border-color: rgba(109,40,217,.5) !important;
  box-shadow: 0 0 0 3px rgba(109,40,217,.15) !important;
  background: rgba(255,255,255,.08) !important;
}
.form-control::placeholder { color: var(--text-muted) !important; }
.form-label { color: #94a3b8; font-size: .85rem; font-weight: 500; }

/* ── Alerts ──────────────────────────────────────────────── */
.alert {
  background: rgba(255,255,255,.05) !important;
  border-radius: 10px !important;
}
.alert-success { border-left: 3px solid var(--success) !important; color: #6ee7b7 !important; }
.alert-danger  { border-left: 3px solid var(--danger) !important;  color: #fda4af !important; }
.alert-warning { border-left: 3px solid var(--warning) !important; color: #fcd34d !important; }
.alert-info    { border-left: 3px solid var(--accent) !important;  color: #7dd3fc !important; }

/* ── Pagination ──────────────────────────────────────────── */
.page-link {
  background: var(--card) !important;
  border-color: var(--card-border) !important;
  color: var(--text-muted) !important;
  border-radius: 8px !important;
  margin: 0 2px;
}
.page-link:hover, .page-item.active .page-link {
  background: var(--primary) !important;
  border-color: var(--primary) !important;
  color: #fff !important;
}

/* ── CTA Banner ──────────────────────────────────────────── */
.cta-banner {
  background: linear-gradient(135deg, rgba(109,40,217,.2), rgba(14,165,233,.12));
  border: 1px solid rgba(109,40,217,.25);
  border-radius: 20px;
}

/* ── Product detail ──────────────────────────────────────── */
.product-detail-img {
  border-radius: var(--radius);
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border: 1px solid var(--card-border);
}
.stock-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: .82rem;
  font-weight: 600;
}
.stock-pill.in-stock {
  background: rgba(16,185,129,.15);
  color: #6ee7b7;
  border: 1px solid rgba(16,185,129,.25);
}
.stock-pill.out-stock {
  background: rgba(244,63,94,.15);
  color: #fda4af;
  border: 1px solid rgba(244,63,94,.25);
}

/* ── Breadcrumb ──────────────────────────────────────────── */
.breadcrumb-item a { color: var(--text-muted); text-decoration: none; }
.breadcrumb-item a:hover { color: var(--primary-light); }
.breadcrumb-item.active { color: var(--text-muted); }
.breadcrumb-item + .breadcrumb-item::before { color: var(--text-muted); }

/* ── Cart ────────────────────────────────────────────────── */
.cart-item-row {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}
.cart-summary {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  position: sticky;
  top: 90px;
}

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  background: var(--bg-2);
  border-top: 1px solid var(--card-border);
}
.site-footer a { color: var(--text-muted); text-decoration: none; transition: color .2s; }
.site-footer a:hover { color: var(--primary-light); }

/* ── Auth pages ──────────────────────────────────────────── */
.auth-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 40px;
  max-width: 440px;
  width: 100%;
}
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse 70% 70% at 10% 60%, rgba(109,40,217,.15) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 90% 10%, rgba(14,165,233,.1) 0%, transparent 60%),
    var(--bg);
}

/* ── Wallet ──────────────────────────────────────────────── */
.wallet-balance-card {
  background: linear-gradient(135deg, rgba(109,40,217,.3) 0%, rgba(14,165,233,.15) 100%);
  border: 1px solid rgba(109,40,217,.4);
  border-radius: 20px;
  padding: 36px;
  position: relative;
  overflow: hidden;
}
.wallet-balance-card::before {
  content: '';
  position: absolute;
  top: -40%; right: -10%;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(139,92,246,.3), transparent 70%);
}
.wallet-balance-value {
  font-size: 3rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -1px;
}
.crypto-selector .crypto-opt {
  background: var(--card);
  border: 2px solid var(--card-border);
  border-radius: 12px;
  padding: 12px 16px;
  cursor: pointer;
  transition: all .25s;
  text-align: center;
}
.crypto-selector input:checked + .crypto-opt {
  border-color: var(--primary);
  background: rgba(109,40,217,.15);
  color: var(--primary-light);
}
.address-box {
  background: rgba(0,0,0,.3);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 12px 16px;
  font-family: monospace;
  font-size: .82rem;
  color: var(--accent);
  word-break: break-all;
  cursor: pointer;
  transition: border-color .2s;
}
.address-box:hover { border-color: rgba(14,165,233,.4); }

/* ── Activity ticker ──────────────────────────────────────── */
.ticker-strip {
  background: rgba(109,40,217,.06);
  border-top: 1px solid rgba(109,40,217,.12);
  border-bottom: 1px solid rgba(109,40,217,.12);
  overflow: hidden;
  white-space: nowrap;
  padding: 10px 0;
}
.ticker-inner {
  display: inline-flex;
  animation: ticker-scroll 40s linear infinite;
}
.ticker-inner:hover { animation-play-state: paused; }
@keyframes ticker-scroll {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 32px;
  font-size: .8rem;
  color: var(--text-muted);
  border-right: 1px solid var(--card-border);
}
.ticker-item strong { color: var(--text); }
.ticker-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--success);
  flex-shrink: 0;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(16,185,129,.5); }
  50%       { box-shadow: 0 0 0 5px rgba(16,185,129,0); }
}

/* ── Stats strip ──────────────────────────────────────────── */
.stats-strip { background: var(--bg-2); }
.stat-item { text-align: center; padding: 36px 16px; }
.stat-value {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -1px;
  background: linear-gradient(135deg, #a78bfa, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  display: block;
}
.stat-label {
  font-size: .82rem;
  color: var(--text-muted);
  margin-top: 8px;
  font-weight: 500;
}

/* ── Product card shimmer on hover ────────────────────────── */
.product-card::before {
  content: '';
  position: absolute;
  top: 0; left: -80%;
  width: 50%; height: 100%;
  background: linear-gradient(to right, transparent 0%, rgba(255,255,255,.045) 50%, transparent 100%);
  transform: skewX(-20deg);
  pointer-events: none;
  z-index: 1;
}
.product-card:hover::before { animation: card-shimmer .65s ease forwards; }
@keyframes card-shimmer {
  0%   { left: -80%; }
  100% { left: 130%; }
}

/* ── How it works ─────────────────────────────────────────── */
.how-step { text-align: center; padding: 24px 16px; }
.how-step-icon {
  width: 60px; height: 60px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(109,40,217,.25), rgba(14,165,233,.15));
  border: 1px solid rgba(109,40,217,.35);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-light);
  margin: 0 auto 18px;
  transition: all .3s;
}
.how-step:hover .how-step-icon {
  box-shadow: 0 0 24px var(--primary-glow);
  background: linear-gradient(135deg, rgba(109,40,217,.45), rgba(14,165,233,.25));
}
.how-step-title { font-weight: 700; font-size: .95rem; margin-bottom: 6px; }
.how-step-desc  { font-size: .82rem; color: var(--text-muted); line-height: 1.6; }

/* ── Page fade-in ─────────────────────────────────────────── */
@keyframes page-fadein {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
body { animation: page-fadein .35s ease both; }

/* ── Scroll reveal ────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .55s ease, transform .55s ease;
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ── Toast notifications ──────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 28px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
.nexshop-toast {
  pointer-events: all;
  background: rgba(14,14,28,.96);
  border: 1px solid rgba(109,40,217,.35);
  border-radius: 14px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 290px;
  max-width: 340px;
  box-shadow: 0 8px 32px rgba(0,0,0,.5), 0 0 0 1px rgba(109,40,217,.15);
  backdrop-filter: blur(20px);
  transform: translateX(120%);
  opacity: 0;
  transition: transform .35s cubic-bezier(.34,1.56,.64,1), opacity .35s ease;
}
.nexshop-toast.show {
  transform: translateX(0);
  opacity: 1;
}
.nexshop-toast.hiding {
  transform: translateX(120%);
  opacity: 0;
}
.toast-img {
  width: 44px; height: 44px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
  border: 1px solid rgba(255,255,255,.1);
}
.toast-icon-wrap {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-size: 1.1rem;
}
.toast-icon-wrap.success { background: rgba(16,185,129,.2); color: #6ee7b7; }
.toast-icon-wrap.error   { background: rgba(244,63,94,.2);  color: #fda4af; }
.toast-body { flex: 1; min-width: 0; }
.toast-title { font-weight: 700; font-size: .82rem; color: var(--text); margin-bottom: 1px; }
.toast-msg   { font-size: .78rem; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.toast-close {
  background: none; border: none; color: var(--text-muted);
  padding: 0 2px; font-size: 1rem; cursor: pointer; flex-shrink: 0;
  transition: color .2s;
}
.toast-close:hover { color: var(--text); }

/* ── Cart icon bounce ─────────────────────────────────────── */
@keyframes cart-bounce {
  0%, 100% { transform: scale(1); }
  30%       { transform: scale(1.35) rotate(-8deg); }
  60%       { transform: scale(0.9) rotate(4deg); }
}
.cart-bounce { animation: cart-bounce .5s ease; }

/* ── Badge pop ────────────────────────────────────────────── */
@keyframes badge-pop {
  0%, 100% { transform: translate(-50%,-50%) scale(1); }
  50%       { transform: translate(-50%,-50%) scale(1.6); }
}
.badge-pop { animation: badge-pop .3s ease; }

/* ── Ripple ───────────────────────────────────────────────── */
.btn-primary-glow, .btn-add-cart { overflow: hidden; }
.ripple {
  position: absolute;
  border-radius: 50%;
  width: 80px; height: 80px;
  margin: -40px 0 0 -40px;
  background: rgba(255,255,255,.25);
  transform: scale(0);
  animation: ripple-anim .65s linear;
  pointer-events: none;
}
@keyframes ripple-anim {
  to { transform: scale(4); opacity: 0; }
}

/* ── Button add-to-cart success state ─────────────────────── */
.btn-add-cart.added {
  background: linear-gradient(135deg, rgba(16,185,129,.35), rgba(16,185,129,.2)) !important;
  border-color: rgba(16,185,129,.5) !important;
  color: #6ee7b7 !important;
}

/* ── Scrollbar ───────────────────────────────────────────────  */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(109,40,217,.4); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* ── Dropdown ────────────────────────────────────────────── */
.dropdown-menu {
  background: #1a1a2e !important;
  border: 1px solid var(--card-border) !important;
  border-radius: 12px !important;
}
.dropdown-item { color: #94a3b8 !important; }
.dropdown-item:hover { background: rgba(109,40,217,.15) !important; color: var(--text) !important; }
.dropdown-divider { border-color: var(--card-border) !important; }

/* ── Image lightbox ─────────────────────────────────────── */
.product-detail-img { cursor: zoom-in; transition: transform .2s; }
.product-detail-img:hover { transform: scale(1.02); }

.img-lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.92);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
  backdrop-filter: blur(4px);
}
.img-lightbox.active { display: flex; }
.img-lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: 12px;
  box-shadow: 0 0 80px rgba(109,40,217,.4);
  animation: lightboxIn .2s ease;
}
@keyframes lightboxIn {
  from { opacity: 0; transform: scale(.92); }
  to   { opacity: 1; transform: scale(1); }
}

/* ── Back to top ────────────────────────────────────────── */
#back-to-top {
  position: fixed;
  bottom: 28px;
  left: 28px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
  color: #fff;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .3s, transform .3s;
  z-index: 999;
  box-shadow: 0 4px 20px rgba(109,40,217,.4);
}
#back-to-top.visible { opacity: 1; transform: translateY(0); }
#back-to-top:hover { transform: translateY(-2px); box-shadow: 0 6px 28px rgba(109,40,217,.6); }