/* ---------- Tokens ---------- */
:root {
  --teal: #0a9b8a;
  --teal-dark: #077567;
  --teal-light: #4fd6c3;
  --sky: #4fb8e8;
  --sky-light: #9bdcf5;
  --navy: #0a1f3d;
  --navy-mid: #123461;
  --navy-light: #1f4a85;
  --ink: #121826;
  --muted: #5c6678;
  --bg: #ffffff;
  --bg-soft: #f4f9fa;
  --bg-tint: #eef6f6;
  --border: #e4edf0;
  --radius: 18px;
  --shadow: 0 16px 40px rgba(10, 31, 61, 0.09);
  --shadow-lg: 0 24px 60px rgba(10, 31, 61, 0.14);
  --max-width: 1180px;
  --font: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-display: 'Plus Jakarta Sans', var(--font);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #081120;
    --bg-soft: #0c1826;
    --bg-tint: #0e1d2c;
    --ink: #eef3f8;
    --muted: #a7b3c4;
    --border: #1c2a3c;
    --shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.5);
  }
}

/* ---------- Reset ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.18; margin: 0 0 0.5em; color: var(--ink); letter-spacing: -0.015em; }
p { margin: 0 0 1em; color: var(--muted); }
ul { margin: 0; padding: 0; list-style: none; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--teal-dark);
  margin: 0 0 0.75em;
}

.text-gradient {
  color: var(--sky);
}

.hero-black {
  color: var(--sky);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 15px 30px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: linear-gradient(100deg, var(--teal), var(--sky));
  color: #fff;
  box-shadow: 0 10px 24px rgba(10, 155, 138, 0.32);
}
.btn-primary:hover { box-shadow: 0 16px 32px rgba(10, 155, 138, 0.42); }

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--navy);
}
.btn-ghost:hover { border-color: var(--teal); color: var(--teal-dark); }

.btn-light {
  background: #fff;
  color: var(--navy);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.25s ease;
}
.site-header.scrolled { box-shadow: 0 8px 24px rgba(10, 31, 61, 0.08); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  gap: 24px;
}
.brand { display: flex; align-items: center; }
.brand-logo { height: 34px; width: auto; }

.nav-desktop { display: flex; gap: 30px; margin-left: auto; }
.nav-desktop a { font-weight: 500; font-size: 0.95rem; color: var(--navy); }
.nav-desktop a:hover { color: var(--teal-dark); }

.nav-cta { margin-left: 24px; padding: 11px 22px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
}

.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 8px 24px 20px;
  border-top: 1px solid var(--border);
}
.nav-mobile a {
  padding: 12px 0;
  font-weight: 500;
  color: var(--navy);
  border-bottom: 1px solid var(--border);
}
.nav-mobile.open { display: flex; }

@media (max-width: 900px) {
  .nav-desktop, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 130px 0 70px;
  text-align: center;
  background: var(--bg-soft);
}
.hero-mesh {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(42% 55% at 18% 15%, rgba(10,155,138,0.20), transparent 70%),
    radial-gradient(38% 50% at 85% 10%, rgba(79,184,232,0.24), transparent 70%),
    radial-gradient(50% 60% at 50% 100%, rgba(10,31,61,0.06), transparent 70%);
}
.hero-inner { position: relative; z-index: 1; max-width: 780px; margin: 0 auto; }

.hero-chip {
  position: absolute;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--navy);
  opacity: 0;
  animation: chip-in 0.7s ease forwards, chip-drift 8s ease-in-out infinite;
}
.hero-chip::before {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(10,155,138,0.22), transparent 70%);
  z-index: -1;
  animation: chip-pulse 3.4s ease-in-out infinite;
}
.hero-chip svg {
  width: 18px;
  height: 18px;
  color: var(--teal-dark);
  animation: icon-spin 5s ease-in-out infinite;
}

.chip-1 { top: 15%; left: 5%; animation-delay: 0s, 0.4s; }
.chip-2 { top: 10%; right: 6%; animation-delay: 0.15s, 1.6s; }
.chip-2 svg { color: var(--navy-light); }
.chip-2::before { background: radial-gradient(circle, rgba(31,74,133,0.2), transparent 70%); }
.chip-3 { bottom: 22%; left: 8%; animation-delay: 0.3s, 2.8s; }
.chip-3 svg { color: var(--sky); }
.chip-3::before { background: radial-gradient(circle, rgba(79,184,232,0.22), transparent 70%); }
.chip-4 { bottom: 16%; right: 8%; animation-delay: 0.45s, 0.9s; }

@keyframes chip-in {
  from { opacity: 0; transform: scale(0.85) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
@keyframes chip-drift {
  0%   { transform: translate(0, 0) rotate(0deg); }
  25%  { transform: translate(7px, -18px) rotate(2deg); }
  50%  { transform: translate(-5px, -28px) rotate(-2deg); }
  75%  { transform: translate(-9px, -10px) rotate(1deg); }
  100% { transform: translate(0, 0) rotate(0deg); }
}
@keyframes chip-pulse {
  0%, 100% { opacity: 0.5; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.15); }
}
@keyframes icon-spin {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(14deg); }
}

@media (max-width: 1100px) {
  .hero-chip { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .hero-chip, .hero-chip::before, .hero-chip svg {
    animation: chip-in 0.01s forwards;
  }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 28px;
}
.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(100deg, var(--teal), var(--sky));
  box-shadow: 0 0 0 4px rgba(10, 155, 138, 0.15);
}

.hero h1 {
  font-size: clamp(2.3rem, 5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--navy);
}
.hero-sub {
  font-size: 1.12rem;
  max-width: 620px;
  margin: 0 auto 2.2em;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-metrics {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 36px;
}
.metric { display: flex; flex-direction: column; gap: 4px; min-width: 100px; }
.metric-number {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 800;
  background: linear-gradient(100deg, var(--teal), var(--sky));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.metric-label { font-size: 0.82rem; color: var(--muted); font-weight: 500; }
.metric-divider { width: 1px; height: 40px; background: var(--border); }

@media (max-width: 760px) {
  .metric-divider { display: none; }
  .hero-metrics { gap: 24px 40px; }
}

/* ---------- Trust strip ---------- */
.trust-strip {
  background: linear-gradient(100deg, var(--navy), var(--navy-mid));
  padding: 20px 0;
}
.trust-inner p {
  margin: 0;
  color: #d9e6f2;
  text-align: center;
  font-size: 0.95rem;
}
.trust-inner strong { color: #fff; }

/* ---------- Section head ---------- */
.section-head {
  max-width: 660px;
  margin: 0 auto 56px;
  text-align: center;
}
.section-head h2 {
  font-size: clamp(1.75rem, 3.4vw, 2.4rem);
  font-weight: 800;
  color: var(--navy);
}
.section-sub { font-size: 1.05rem; }

/* ---------- Services ---------- */
.services { padding: 110px 0 100px; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}
.card {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}
.card-number {
  position: absolute;
  top: 28px;
  right: 32px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--border);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.card.featured {
  background: linear-gradient(165deg, var(--bg-tint), var(--bg));
  border-color: rgba(10, 155, 138, 0.25);
}
.card h3 { font-size: 1.25rem; font-weight: 800; }
.card > p { font-size: 0.97rem; margin-bottom: 18px; }

.card-list {
  display: grid;
  gap: 10px;
}
.card-list li {
  position: relative;
  padding-left: 22px;
  font-size: 0.9rem;
  color: var(--muted);
}
.card-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: linear-gradient(100deg, var(--teal), var(--sky));
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: #fff;
}
.card-icon svg { width: 27px; height: 27px; }
.icon-cloud { background: linear-gradient(135deg, var(--teal), var(--teal-dark)); }
.icon-data { background: linear-gradient(135deg, var(--sky), #2f8fc2); }
.icon-testing { background: linear-gradient(135deg, var(--teal-dark), var(--navy)); }
.icon-staffing { background: linear-gradient(135deg, var(--navy-mid), var(--navy)); }

@media (max-width: 860px) {
  .card-grid { grid-template-columns: 1fr; }
}

/* ---------- Process ---------- */
.process { padding: 100px 0; background: var(--bg-soft); }
.process-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 28px;
  position: relative;
}
.process-step {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
}
.process-number {
  display: block;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--teal-dark);
  margin-bottom: 14px;
}
.process-icon {
  width: 46px;
  height: 46px;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--teal), var(--sky));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.process-icon svg { width: 23px; height: 23px; }
.process-step h3 { font-size: 1.05rem; font-weight: 700; color: var(--navy); }
.process-step p { font-size: 0.92rem; margin-bottom: 0; }

/* ---------- Industries ---------- */
.industries { position: relative; overflow: hidden; padding: 100px 0; }
.industries-mesh {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(40% 60% at 90% 10%, rgba(79,184,232,0.14), transparent 70%),
              radial-gradient(35% 55% at 5% 90%, rgba(10,155,138,0.12), transparent 70%);
}
.industries .container { position: relative; z-index: 1; }
.industry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 26px;
  max-width: 920px;
  margin: 0 auto;
}
.industry-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow);
}
.industry-card h3 { font-size: 1.2rem; font-weight: 800; }
.industry-card p { font-size: 0.95rem; margin-bottom: 0; }

/* ---------- Partners ---------- */
.partners { padding: 70px 0; }
.partners-label {
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
  margin: 0 0 32px;
}
.partners-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
}
.partner-badge {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 26px;
  min-width: 300px;
}
.partner-mark {
  width: 46px;
  height: 46px;
  min-width: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border);
}
.partner-mark svg { width: 24px; height: 24px; }
.partner-mark-oracle { color: #c74634; }
.partner-mark-ms svg { width: 22px; height: 22px; }
.partner-copy { display: flex; flex-direction: column; gap: 2px; }
.partner-name { font-weight: 800; color: var(--navy); font-size: 0.98rem; }
.partner-desc { font-size: 0.82rem; color: var(--muted); }

/* ---------- About ---------- */
.about { padding: 100px 0; }
.about-inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-copy h2 {
  font-size: clamp(1.75rem, 3.2vw, 2.3rem);
  font-weight: 800;
  color: var(--navy);
}
.about-stats {
  display: grid;
  gap: 16px;
}
.stat {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.stat-icon {
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--teal), var(--sky));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}
.stat-icon svg { width: 22px; height: 22px; }
.stat-text {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0;
  padding-top: 2px;
}
.stat-text strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 2px;
}

@media (max-width: 860px) {
  .about-inner { grid-template-columns: 1fr; }
}

/* ---------- Why ---------- */
.why { padding: 100px 0; background: var(--bg-soft); }
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}
.why-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 28px;
}
.why-icon {
  width: 46px;
  height: 46px;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--navy), var(--navy-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.why-icon svg { width: 23px; height: 23px; }
.why-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
}
.why-item p { margin-bottom: 0; font-size: 0.95rem; }

/* ---------- CTA ---------- */
.cta {
  position: relative;
  overflow: hidden;
  background: linear-gradient(125deg, var(--navy), var(--navy-mid) 60%, var(--navy-light));
  padding: 90px 0;
  text-align: center;
}
.cta-mesh {
  position: absolute;
  inset: 0;
  background: radial-gradient(45% 70% at 80% 0%, rgba(79,184,232,0.28), transparent 70%),
              radial-gradient(40% 60% at 10% 100%, rgba(10,155,138,0.22), transparent 70%);
  pointer-events: none;
}
.cta-inner { position: relative; z-index: 1; }
.cta h2 { color: #fff; font-size: clamp(1.7rem, 3.4vw, 2.2rem); }
.cta p { color: #c6d4e5; max-width: 520px; margin: 0 auto 2em; }

/* ---------- Contact ---------- */
.contact { padding: 100px 0; }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 48px;
}
.contact-details {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.contact-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--teal-dark);
  font-weight: 700;
}
.contact-item a,
.contact-item span {
  font-size: 1.05rem;
  color: var(--navy);
  font-weight: 600;
}
.contact-item a:hover { color: var(--teal-dark); }

.contact-form {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.contact-form input,
.contact-form textarea {
  font-family: var(--font);
  width: 100%;
  padding: 13px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  font-size: 0.95rem;
  resize: vertical;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--teal);
}
.form-note { font-size: 0.9rem; color: var(--teal-dark); margin: 0; min-height: 1.2em; }
.form-note.is-error { color: #c0392b; }
.form-note a { color: inherit; text-decoration: underline; font-weight: 700; }

.hp-field { position: absolute; left: -9999px; top: -9999px; }

.btn[disabled] { opacity: 0.65; cursor: not-allowed; transform: none !important; }

@media (max-width: 860px) {
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}

.contact-map {
  margin-top: 40px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.contact-map iframe { display: block; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy); padding-top: 64px; }
.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-col { display: flex; flex-direction: column; gap: 12px; }
.footer-col h4 {
  color: #fff;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 4px;
}
.footer-col a, .footer-col span { color: #c3d2e3; font-size: 0.92rem; }
.footer-col a:hover { color: var(--sky-light); }
.footer-brand-col { max-width: 320px; }
.footer-logo { height: 30px; filter: brightness(0) invert(1); margin-bottom: 4px; }
.footer-brand-col p { color: #9fb2c9; font-size: 0.85rem; margin: 0; }

.footer-bottom { padding: 22px 0; }
.footer-bottom p { color: #7f93ab; font-size: 0.82rem; margin: 0; }
.footer-bottom a { color: #9fb2c9; }
.footer-bottom a:hover { color: var(--sky-light); }

@media (max-width: 860px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer-top { grid-template-columns: 1fr; }
}

/* ---------- Legal pages ---------- */
.legal { padding: 70px 0 100px; }
.legal-inner { max-width: 760px; margin: 0 auto; }
.legal-inner h1 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 800;
  color: var(--navy);
}
.legal-updated { font-size: 0.88rem; color: var(--muted); margin-bottom: 2.5em; }
.legal-inner h2 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--navy);
  margin-top: 2em;
}
.legal-inner p, .legal-inner li { font-size: 0.98rem; }
.legal-list { display: grid; gap: 8px; margin: 1em 0; }
.legal-list li { position: relative; padding-left: 20px; }
.legal-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: linear-gradient(100deg, var(--teal), var(--sky));
}
.legal-inner a { color: var(--teal-dark); font-weight: 600; }
.legal-inner a:hover { color: var(--navy); }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(100deg, var(--teal), var(--sky));
  color: #fff;
  box-shadow: 0 10px 24px rgba(10, 155, 138, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
  z-index: 60;
}
.back-to-top svg { width: 20px; height: 20px; }
.back-to-top.visible { opacity: 1; visibility: visible; transform: none; }