/* ── Fonts ──────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Tokens ─────────────────────────────────────────────────── */
:root {
  --bg:       #06090F;
  --surface:  #0C1220;
  --surface2: #111A2B;
  --border:   #1C2D44;
  --border2:  #254060;
  --text:     #C8D8E8;
  --text2:    #587898;
  --text3:    #2A3F58;

  --intent:   #32C96A;
  --execute:  #A87CF8;
  --observe:  #34BCFA;
  --resource: #F0A82A;
  --katalog:  #F59E0B;
  --red:      #F87171;

  --font: 'DM Sans', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ── Scroll reveal ───────────────────────────────────────────── */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .55s ease, transform .55s ease;
}
[data-reveal].revealed {
  opacity: 1;
  transform: none;
}
[data-reveal][data-delay="1"] { transition-delay: .1s; }
[data-reveal][data-delay="2"] { transition-delay: .2s; }
[data-reveal][data-delay="3"] { transition-delay: .3s; }
[data-reveal][data-delay="4"] { transition-delay: .4s; }
[data-reveal][data-delay="5"] { transition-delay: .5s; }

/* ── NAV ──────────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: env(safe-area-inset-top, 0);
  z-index: 200;
  border-bottom: 1px solid var(--border);
  background: rgba(6,9,15,.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-inner {
  max-width: 1200px; margin: 0 auto; padding-inline: 28px;
  height: 60px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}

.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 17px; letter-spacing: -.3px; flex-shrink: 0;
}

.nav-logo img { width: 28px; height: 28px; border-radius: 6px; }

.nav-links { display: flex; align-items: center; gap: 2px; }

.nav-link {
  padding: 6px 12px; border-radius: 6px;
  font-size: 14px; font-weight: 500; color: var(--text2);
  transition: color .15s, background .15s;
}
.nav-link:hover { color: var(--text); background: var(--surface2); }

.nav-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

.nav-search {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 14px;
  background: var(--surface); border: 1px solid var(--border2); border-radius: 8px;
  font-size: 13px; color: var(--text3); min-width: 185px; cursor: text;
}

.kbd {
  margin-left: auto; font-size: 11px; font-family: var(--mono);
  background: var(--surface2); border: 1px solid var(--border2); border-radius: 4px; padding: 1px 6px;
}

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 8px;
  font-size: 14px; font-weight: 600; font-family: var(--font);
  border: none; cursor: pointer;
  transition: opacity .15s, transform .1s; white-space: nowrap;
}
.btn:hover { opacity: .84; }
.btn:active { transform: scale(.97); }

.btn-primary  { background: var(--observe); color: #06090F; }
.btn-ghost    { background: var(--surface); border: 1px solid var(--border2); color: var(--text2); }
.btn-ghost:hover { color: var(--text); background: var(--surface2); }
.btn-outline  { background: transparent; border: 1px solid var(--border2); color: var(--text); }
.btn-outline:hover { background: var(--surface2); }

/* ── LAYOUT ───────────────────────────────────────────────────── */
.w { max-width: 1200px; margin: 0 auto; padding-inline: 28px; }

/* ── HERO ─────────────────────────────────────────────────────── */
.hero {
  text-align: center; padding-block: 88px 72px;
  position: relative; overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute; top: -250px; left: 50%; transform: translateX(-50%);
  width: 1000px; height: 700px;
  background:
    radial-gradient(ellipse 700px 400px at 40% 60%, rgba(52,188,250,.05) 0%, transparent 60%),
    radial-gradient(ellipse 500px 350px at 70% 40%, rgba(168,124,248,.04) 0%, transparent 60%);
  pointer-events: none;
}

.hero-inner { position: relative; max-width: 820px; margin: 0 auto; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(52,188,250,.07); border: 1px solid rgba(52,188,250,.2); border-radius: 100px;
  padding: 5px 16px 5px 10px;
  font-size: 12px; color: var(--observe); font-weight: 500; margin-bottom: 28px;
  font-family: var(--mono);
}

.badge-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--observe); flex-shrink: 0;
  animation: blink 2.5s ease infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  55%       { opacity: .25; }
}

h1 {
  font-size: clamp(36px, 5.5vw, 58px);
  font-weight: 700; line-height: 1.06; letter-spacing: -2px;
  margin-bottom: 22px; text-wrap: balance;
}

.dim { color: var(--text2); font-weight: 300; }

.hero-sub {
  font-size: clamp(16px, 1.8vw, 18px); color: var(--text2); font-weight: 300;
  line-height: 1.7; max-width: 600px; margin: 0 auto 36px;
}

.hero-sub strong { color: var(--text); font-weight: 500; }

.hero-actions {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; flex-wrap: wrap; margin-bottom: 28px;
}

.btn-lg { padding: 12px 28px; font-size: 15px; border-radius: 10px; }

.hero-install {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 10px 16px;
  font-family: var(--mono); font-size: 13.5px; color: var(--text2);
}
.hero-install .p { color: var(--text3); user-select: none; }
.hero-install .cmd { color: var(--text); }
.hero-install .pkg { color: var(--observe); }

.copy-btn {
  background: none; border: none; cursor: pointer;
  color: var(--text3); padding: 0; transition: color .15s;
}
.copy-btn:hover { color: var(--observe); }

/* ── THREE RUNTIME SERVICES ─────────────────────────────────────── */
.runtime-services {
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.rs-grid {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, 1fr);
}

.rs-item {
  padding: 44px 36px; border-right: 1px solid var(--border);
}
.rs-item:last-child { border-right: none; }

.rs-kw {
  font-size: 10px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase;
  font-family: var(--mono); margin-bottom: 10px;
}

.rs-title {
  font-size: 20px; font-weight: 700; letter-spacing: -.4px; margin-bottom: 10px;
}

.rs-desc {
  font-size: 14px; color: var(--text2); line-height: 1.65; max-width: 280px;
}

/* ── SECTION CHROME ─────────────────────────────────────────────── */
.label {
  display: inline-block; font-size: 10px; font-weight: 600; letter-spacing: .12em;
  text-transform: uppercase; font-family: var(--mono); margin-bottom: 10px;
}

h2 {
  font-size: clamp(26px, 3.5vw, 38px); font-weight: 700;
  letter-spacing: -.7px; text-wrap: balance;
}

.sub {
  font-size: 16px; color: var(--text2); font-weight: 300; line-height: 1.65;
}

/* ── CODE WINDOW ─────────────────────────────────────────────────── */
.cw {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden; box-shadow: 0 20px 50px rgba(0,0,0,.5);
}

.cw-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 16px;
  background: rgba(255,255,255,.02); border-bottom: 1px solid var(--border);
}
.cw-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.cw-name {
  font-size: 12px; color: var(--text2); font-family: var(--mono);
  margin: 0 auto; transform: translateX(-22px);
}

pre, code { font-family: var(--mono); font-size: 13px; line-height: 1.75; }

.cb { padding: 20px 22px; overflow-x: auto; }

/* syntax */
.k  { color: var(--observe); }
.s  { color: var(--intent); }
.v  { color: var(--resource); }
.c  { color: var(--text3); font-style: italic; }
.t  { color: var(--execute); }
.p  { color: var(--text2); }
.pr { color: var(--text3); user-select: none; }
.kw { color: var(--observe); }

/* ── QUICK START ─────────────────────────────────────────────────── */
.qs { padding-block: 80px; }

.qs-wrap {
  display: grid; grid-template-columns: 1fr 1.5fr;
  gap: 64px; align-items: start;
}

.qs-selectors { display: flex; flex-direction: column; gap: 14px; margin-block: 24px 0; }

.qs-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

.qs-lbl {
  font-size: 12px; color: var(--text2); font-weight: 500; width: 64px; flex-shrink: 0;
}

.chips { display: flex; gap: 6px; flex-wrap: wrap; }

.chip {
  padding: 5px 14px; border-radius: 6px; font-size: 13px; font-weight: 500;
  cursor: pointer; border: 1px solid var(--border2); background: var(--surface2); color: var(--text2);
  font-family: var(--font); transition: all .15s;
}
.chip:hover { border-color: var(--observe); color: var(--text); }
.chip.on    { background: rgba(52,188,250,.1); border-color: var(--observe); color: var(--observe); }

.qs-note {
  font-size: 12px; color: var(--text3); margin-top: 16px; line-height: 1.5;
  font-family: var(--mono);
}

/* ── SUPER-OPERATOR ──────────────────────────────────────────────── */
.super { padding-block: 80px; }

.super-split {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 72px; align-items: start;
}

.inc-trigger {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: 8px;
  background: rgba(168,124,248,.08); border: 1px solid rgba(168,124,248,.25);
  color: var(--execute); font-size: 14px; font-weight: 600; font-family: var(--font);
  cursor: pointer; transition: background .15s, border-color .15s;
}
.inc-trigger:hover { background: rgba(168,124,248,.14); border-color: rgba(168,124,248,.4); }

/* ── MODAL ─────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(6,9,15,.75); backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center; padding: 24px;
  opacity: 0; pointer-events: none;
  transition: opacity .2s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal-box {
  background: var(--surface2); border: 1px solid var(--border2); border-radius: 16px;
  padding: 28px; max-width: 780px; width: 100%;
  transform: translateY(12px); transition: transform .2s;
  max-height: 90vh; overflow-y: auto;
}
.modal-overlay.open .modal-box { transform: none; }

.modal-hd {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 16px;
  margin-bottom: 24px;
}

.modal-title { font-size: 20px; font-weight: 700; letter-spacing: -.3px; }

.modal-close {
  background: var(--surface); border: 1px solid var(--border2); border-radius: 7px;
  color: var(--text2); padding: 6px; cursor: pointer; flex-shrink: 0;
  transition: color .15s, border-color .15s;
}
.modal-close:hover { color: var(--text); border-color: var(--text3); }

.inc-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;
}

.inc-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px; transition: border-color .2s;
}
.inc-card:hover { border-color: var(--border2); }

.inc-name { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 3px; }
.inc-sub  { font-size: 11.5px; color: var(--text3); line-height: 1.4; }

/* ── CODE TABS ──────────────────────────────────────────────────── */
.cw-tabs {
  display: flex; align-items: center; gap: 2px;
  padding: 8px 12px; background: rgba(255,255,255,.02); border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.cw-tab {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 6px; border: none; cursor: pointer;
  font-size: 13px; font-weight: 500; font-family: var(--font);
  background: none; color: var(--text3); transition: all .15s;
}
.cw-tab:hover { color: var(--text2); background: var(--surface2); }
.cw-tab.on { background: var(--surface2); color: var(--text); }

.cw-badge {
  margin-left: auto; font-size: 10px; font-weight: 600; letter-spacing: .06em;
  font-family: var(--mono); color: var(--intent);
  background: rgba(50,201,106,.08); border: 1px solid rgba(50,201,106,.2);
  border-radius: 4px; padding: 3px 9px;
}

.cw-panel-hd {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px; border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,.01);
}

.cw-fname { font-family: var(--mono); font-size: 12px; color: var(--text2); }

.cw-pill {
  font-size: 11px; font-weight: 500; font-family: var(--mono);
  color: var(--intent); white-space: nowrap;
}

/* ── CONTROL CENTER ─────────────────────────────────────────────── */
.cc-section { padding-block: 80px; }

.cc-inner {
  display: grid; grid-template-columns: 1fr 1.2fr;
  gap: 64px; align-items: center;
}

.cc-feats { display: flex; flex-direction: column; gap: 18px; }

.cc-feat { display: flex; gap: 14px; align-items: flex-start; }

.cc-feat svg { flex-shrink: 0; margin-top: 2px; }

.cc-feat-title { font-size: 14px; font-weight: 600; margin-bottom: 3px; }
.cc-feat-desc  { font-size: 13px; color: var(--text2); line-height: 1.6; }

.cc-mock-wrap {
  border-radius: 14px; overflow: hidden;
  border: 1px solid var(--border); box-shadow: 0 24px 60px rgba(0,0,0,.55);
}

.cc-mock { background: var(--surface); font-family: var(--mono); font-size: 12px; }

.cc-mock-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 14px; background: var(--surface2); border-bottom: 1px solid var(--border);
}
.cc-dot-r { width:9px;height:9px;border-radius:50%;background:#FF5F57;flex-shrink:0; }
.cc-dot-y { width:9px;height:9px;border-radius:50%;background:#FEBC2E;flex-shrink:0; }
.cc-dot-g { width:9px;height:9px;border-radius:50%;background:#28C840;flex-shrink:0; }
.cc-mock-url { font-size:11px;color:var(--text3);margin-left:6px; }

.cc-mock-body { display: flex; min-height: 280px; }

.cc-mock-sidebar {
  width: 140px; flex-shrink: 0;
  background: var(--surface2); border-right: 1px solid var(--border);
  padding: 14px 0;
}
.cc-mock-logo { font-size:11px;color:var(--observe);font-weight:700;padding:0 14px 12px; }
.cc-mock-nav { padding: 7px 14px; font-size:11px;color:var(--text3); cursor:default; }
.cc-mock-nav.on { background:rgba(52,188,250,.07);color:var(--observe); }

.cc-mock-main { flex:1; padding: 14px; overflow: hidden; }

.cc-mock-hd {
  display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;
}
.cc-mock-name { font-size:12px;font-weight:700;color:var(--text); }
.cc-mock-status { font-size:11px; }
.cc-mock-status.green { color:var(--intent); }

.cc-mock-stats {
  display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-bottom:12px;
}
.cc-stat {
  background:var(--bg);border:1px solid var(--border);border-radius:6px;
  padding:8px;text-align:center;
}
.cc-stat-n { display:block;font-size:16px;font-weight:700;color:var(--text);font-family:var(--mono); }
.cc-stat-l { display:block;font-size:10px;color:var(--text3);margin-top:2px; }

.cc-mock-cards { display:grid;grid-template-columns:1fr 1fr;gap:6px; }

.cc-crd {
  background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:8px;
}
.cc-crd.yellow { border-color:rgba(240,168,42,.2); }
.cc-crd-name { font-size:11px;font-weight:700;color:var(--text);margin-bottom:3px; }
.cc-crd-st { font-size:10px;margin-bottom:5px; }
.cc-crd-st.green { color:var(--intent); }
.cc-crd-st.yellow { color:var(--resource); }
.cc-bar-wrap { height:3px;background:var(--border);border-radius:2px;margin-bottom:5px;overflow:hidden; }
.cc-bar-fill { height:100%;background:var(--intent);border-radius:2px; }
.cc-crd-detail { font-size:10px;color:var(--text3); }

/* ── GATEWAY ─────────────────────────────────────────────────────── */
.gateway { padding-block: 80px; }

.gw-split {
  display: grid; grid-template-columns: 1fr 1.1fr;
  gap: 64px; align-items: start;
}

.caller-list {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 24px;
}

.caller-item {
  display: flex; align-items: center; gap: 10px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 9px;
  padding: 12px 14px; font-size: 13.5px; color: var(--text2); font-weight: 500;
}

.caller-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }

/* ── REGISTRY ────────────────────────────────────────────────────── */
.registry {
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  background: var(--surface); padding-block: 72px;
}

.reg-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }

.reg-kinds {
  display: flex; flex-direction: column; gap: 8px; margin-top: 24px;
}

.reg-kind {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface2); border: 1px solid var(--border); border-radius: 9px;
  padding: 12px 16px; text-decoration: none; color: inherit;
  transition: border-color .2s;
}
a.reg-kind:hover { border-color: var(--observe); }

.rk-badge {
  font-family: var(--mono); font-size: 11px; font-weight: 600;
  padding: 3px 8px; border-radius: 4px; flex-shrink: 0;
}

.rk-desc { font-size: 13px; color: var(--text2); }

/* ── THREE CORE COMPONENTS ───────────────────────────────────────── */
.components { padding-block: 80px; }

.comp-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 40px;
}

.comp-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 28px; display: block; text-decoration: none; color: inherit;
  transition: border-color .2s, transform .2s;
}
a.comp-card:hover { border-color: var(--observe); transform: translateY(-2px); }

.comp-label {
  font-size: 10px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase;
  font-family: var(--mono); margin-bottom: 10px;
}

.comp-card h3 { font-size: 18px; font-weight: 700; letter-spacing: -.3px; margin-bottom: 8px; }
.comp-card p  { font-size: 14px; color: var(--text2); line-height: 1.65; }

/* ── COMMUNITY ───────────────────────────────────────────────────── */
.community {
  background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  padding-block: 80px; text-align: center;
}

.com-actions {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; flex-wrap: wrap; margin-top: 32px;
}

.btn-com { padding: 11px 24px; font-size: 15px; border-radius: 9px; }

/* ── RESOURCES ───────────────────────────────────────────────────── */
.resources { padding-block: 72px; }

.res-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 40px;
}

.res-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 26px; cursor: pointer; transition: border-color .2s, transform .2s;
}
.res-card:hover { border-color: var(--border2); transform: translateY(-2px); }

.res-head { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 12px; }

.res-icon { font-size: 20px; }
.res-arrow { font-size: 18px; color: var(--text3); }

.res-card h3 { font-size: 16px; font-weight: 600; letter-spacing: -.2px; margin-bottom: 6px; }
.res-card p  { font-size: 13.5px; color: var(--text2); line-height: 1.6; }

/* ── ECOSYSTEM ───────────────────────────────────────────────────── */
.ecosystem { padding-block: 48px 64px; }

.eco-lbl {
  font-size: 11px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  font-family: var(--mono); color: var(--text3); margin-bottom: 16px;
}

.eco-tags { display: flex; gap: 7px; flex-wrap: wrap; }

.eco-tag {
  padding: 6px 14px; border-radius: 6px;
  background: var(--surface); border: 1px solid var(--border);
  font-size: 13px; color: var(--text2); font-weight: 500; transition: all .15s;
}
.eco-tag:hover { border-color: var(--border2); color: var(--text); }

/* ── FOOTER ──────────────────────────────────────────────────────── */
footer.landing-footer { border-top: 1px solid var(--border); padding-block: 36px; }

.foot {
  max-width: 1200px; margin: 0 auto; padding-inline: 28px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}

.foot-copy { font-size: 13px; color: var(--text3); }

.foot-links { list-style: none; display: flex; gap: 20px; }
.foot-links a { font-size: 13px; color: var(--text3); transition: color .15s; }
.foot-links a:hover { color: var(--text2); }

/* ── RESPONSIVE ──────────────────────────────────────────────────── */
@media (max-width: 1000px) {
  .rs-grid, .qs-wrap, .super-split, .gw-split, .reg-inner, .comp-grid, .cc-inner { grid-template-columns: 1fr; }
  .rs-item { border-right: none; border-bottom: 1px solid var(--border); }
  .rs-item:last-child { border-bottom: none; }
  .res-grid { grid-template-columns: 1fr; }
  .nav-links, .nav-search { display: none; }
  .inc-grid { grid-template-columns: 1fr 1fr; }
  .modal-box { padding: 20px; }
}

@media (max-width: 600px) {
  .caller-list { grid-template-columns: 1fr; }
  h1 { letter-spacing: -1.2px; }
  .hero { padding-block: 60px 48px; }
  .inc-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* ── Back to top ─────────────────────────────────────────────── */
#back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text2);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s, border-color 0.2s;
  z-index: 90;
}
#back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}
#back-to-top:hover {
  border-color: var(--observe);
  color: var(--observe);
  transform: translateY(-2px);
}