*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --navy:        #1e3a8a;
  --navy-deep:   #172554;
  --navy-mid:    #2d4cad;
  --blue:        #2563eb;
  --blue-light:  #3b82f6;
  --orange:      #ea6b3a;
  --orange-dark: #c8531f;
  --ink:         #0f172a;
  --ink-2:       #1e293b;
  --muted:       #64748b;
  --muted-2:     #94a3b8;
  --bg:          #ffffff;
  --bg-soft:     #f7f9fc;
  --bg-card:     #ffffff;
  --border:      #e5e7eb;
  --border-soft: #eef1f5;
  --shadow-sm:   0 1px 2px rgba(15,23,42,0.05);
  --shadow:      0 4px 14px rgba(15,23,42,0.06);
  --shadow-lg:   0 18px 40px rgba(15,23,42,0.08);
  --radius:      14px;
  --radius-sm:   10px;
  --radius-lg:   20px;
  --max:         1180px;
  --font:        'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
picture { display: contents; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ── NAV ── */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner {
  max-width: var(--max); margin: 0 auto;
  display: flex; align-items: center; gap: 1.5rem;
  padding: 0.85rem 1.5rem;
}
.nav-logo img { height: 68px; width: auto; }
.nav-links {
  display: flex; gap: 1.75rem; list-style: none;
  margin-left: 2rem; flex: 1; justify-content: center;
}
.nav-links a {
  font-size: 0.92rem; font-weight: 500; color: var(--ink-2);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--blue); }
.nav-right { display: flex; align-items: center; gap: 1rem; }
.nav-phone {
  display: flex; align-items: center; gap: 0.45rem;
  font-size: 0.95rem; font-weight: 600; color: var(--ink);
}
.nav-phone svg { width: 16px; height: 16px; color: var(--blue); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  font-family: var(--font); font-weight: 600; font-size: 0.92rem;
  padding: 0.7rem 1.3rem; border-radius: 8px;
  border: 1px solid transparent; transition: transform 0.15s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
  cursor: pointer; white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn-orange {
  background: linear-gradient(180deg, #ee7644 0%, var(--orange) 100%);
  color: #fff; box-shadow: 0 6px 18px rgba(234,107,58,0.32);
}
.btn-orange:hover { transform: translateY(-1px); box-shadow: 0 10px 22px rgba(234,107,58,0.4); }
.btn-white { background: #fff; color: var(--ink); border-color: var(--border); }
.btn-white:hover { border-color: var(--navy); color: var(--navy); }
.btn-outline-white {
  background: transparent; color: #fff;
  border: 1px solid rgba(255,255,255,0.5);
}
.btn-outline-white:hover { background: rgba(255,255,255,0.12); border-color: #fff; }
.btn-lg { padding: 0.95rem 1.6rem; font-size: 0.98rem; }
.btn-block { width: 100%; }
.hamburger { display: none; background: none; border: none; padding: 6px; }
.hamburger span {
  display: block; width: 22px; height: 2px; background: var(--ink);
  margin: 4px 0; border-radius: 2px; transition: 0.25s;
}

/* ── HERO ── */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(110deg, var(--navy-deep) 0%, var(--navy) 35%, var(--blue) 100%);
  color: #fff;
  padding: 5.5rem 1.5rem 6rem;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(900px 460px at 85% -10%, rgba(255,255,255,0.18), transparent 60%),
    radial-gradient(700px 360px at 0% 110%, rgba(234,107,58,0.18), transparent 60%);
  pointer-events: none;
}
.hero::after {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}
.hero-inner {
  position: relative; z-index: 1;
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 4rem; align-items: center;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.18);
  padding: 0.4rem 0.85rem; border-radius: 999px;
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  color: #bfdbfe; margin-bottom: 1.25rem;
}
.hero-eyebrow .dot { width: 7px; height: 7px; background: var(--orange); border-radius: 50%; }
.hero h1 {
  font-size: clamp(2.4rem, 4.6vw, 3.8rem); font-weight: 800; line-height: 1.05;
  letter-spacing: -0.02em; margin-bottom: 1.1rem;
}
.hero h1 .accent { color: #fdba74; }
.hero-sub {
  font-size: 1.1rem; color: rgba(255,255,255,0.78); font-weight: 400;
  max-width: 560px; margin-bottom: 2rem;
}
.hero-actions { display: flex; gap: 0.85rem; flex-wrap: wrap; margin-bottom: 2.4rem; }
.hero-meta { display: flex; gap: 1.8rem; flex-wrap: wrap; }
.hero-meta-item {
  display: flex; align-items: center; gap: 0.55rem;
  font-size: 0.88rem; color: rgba(255,255,255,0.75);
  text-decoration: none;
}
.hero-meta-item:hover { color: #fff; }
.hero-meta-item svg { width: 18px; height: 18px; color: #fdba74; }

.hero-image-wrap {
  border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid rgba(255,255,255,0.16);
  box-shadow: 0 22px 50px rgba(0,0,0,0.28);
  aspect-ratio: 4 / 3;
}
.hero-image {
  width: 100%; height: 100%; object-fit: cover; display: block;
}
.hero-visual { display: block; }

/* ── GENERIC SECTION ── */
section { padding: 5rem 1.5rem; }
.section-inner { max-width: var(--max); margin: 0 auto; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 3rem; }
.section-head.left { text-align: left; margin-left: 0; }
.section-eyebrow {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--blue); margin-bottom: 0.9rem;
}
.section-title {
  font-size: clamp(1.85rem, 3.2vw, 2.55rem); font-weight: 800;
  letter-spacing: -0.02em; color: var(--ink); line-height: 1.15;
}
.section-sub {
  margin-top: 1rem; color: var(--muted); font-size: 1.02rem; line-height: 1.65;
}

/* ── ABOUT ── */
.about { background: #fff; }
.about-grid {
  display: grid; grid-template-columns: 0.95fr 1.05fr; gap: 3.5rem; align-items: center;
}
.about-media {
  border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--border-soft); box-shadow: var(--shadow-lg);
  background: var(--bg-soft);
}
.about-media img {
  width: 100%; display: block;
  height: 100%; min-height: 360px; max-height: 480px;
  object-fit: cover; object-position: center;
}
.about-content .section-head {
  text-align: left; margin: 0; max-width: none;
}
.about-content .section-sub { margin-top: 1rem; }
.about-content .section-sub + .section-sub { margin-top: 0.85rem; }

/* ── WHY INTELAIR (split layout) ── */
.why { background: var(--bg-soft); }
.why-grid {
  display: grid; grid-template-columns: 1fr 1.15fr; gap: 4rem; align-items: start;
}
.why-left .section-eyebrow { margin-bottom: 0.6rem; }
.why-left h2 {
  font-size: clamp(1.9rem, 3.2vw, 2.6rem); font-weight: 800; line-height: 1.12;
  letter-spacing: -0.02em; margin-bottom: 1rem; color: var(--ink);
}
.why-left p { color: var(--muted); font-size: 1rem; line-height: 1.7; margin-bottom: 1.8rem; }
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem; }
.stat-card {
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.3rem; text-align: center;
}
.stat-num {
  font-size: 1.85rem; font-weight: 800; color: var(--blue);
  letter-spacing: -0.02em; line-height: 1;
  display: inline-flex; align-items: center; gap: 0.25rem;
}
.stat-num .star { color: #fbbf24; font-size: 1.4rem; }
.stat-label { display: block; margin-top: 0.45rem; color: var(--muted); font-size: 0.85rem; }
.stat-label a { color: inherit; text-decoration: none; }
.stat-label a:hover { color: var(--blue); }

.why-cards {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}
.why-card {
  background: #fff; border: 1px solid var(--border-soft);
  border-radius: var(--radius); padding: 1.4rem; box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
}
.why-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.why-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: #ffe7d8; color: var(--orange);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 0.85rem;
}
.why-icon svg { width: 20px; height: 20px; }
.why-card h4 {
  font-size: 1rem; font-weight: 700; color: var(--ink); margin-bottom: 0.4rem;
  line-height: 1.3;
}
.why-card p { font-size: 0.88rem; color: var(--muted); line-height: 1.55; }

/* ── SERVICES ── */
.services { background: var(--bg-soft); }
.card-grid-3 {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem;
}
.svc-card {
  background: #fff; border: 1px solid var(--border-soft);
  border-radius: var(--radius); padding: 1.7rem; position: relative;
  box-shadow: var(--shadow-sm); transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.svc-card:hover {
  transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: #d1d9e6;
}
.svc-badge {
  position: absolute; top: 1rem; right: 1rem;
  background: var(--orange); color: #fff;
  font-size: 0.7rem; font-weight: 600; padding: 0.25rem 0.65rem;
  border-radius: 999px; letter-spacing: 0.02em;
}
.svc-icon {
  width: 44px; height: 44px; border-radius: 11px;
  background: linear-gradient(140deg, var(--blue) 0%, var(--navy) 100%);
  color: #fff; display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.1rem;
  box-shadow: 0 8px 18px rgba(37,99,235,0.25);
}
.svc-icon svg { width: 22px; height: 22px; }
.svc-card h3 {
  font-size: 1.1rem; font-weight: 700; color: var(--ink); margin-bottom: 0.5rem;
}
.svc-card p { font-size: 0.92rem; color: var(--muted); line-height: 1.6; }

/* ── INDUSTRIES ── */
.industries { background: var(--bg-soft); }
.ind-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem;
}
.ind-card {
  background: #fff; border: 1px solid var(--border-soft);
  border-radius: var(--radius); padding: 1.4rem;
  box-shadow: var(--shadow-sm); transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.ind-card:hover {
  transform: translateY(-3px); box-shadow: var(--shadow); border-color: #d1d9e6;
}
.ind-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(140deg, var(--blue) 0%, var(--navy) 100%);
  color: #fff; display: flex; align-items: center; justify-content: center;
  margin-bottom: 0.9rem;
  box-shadow: 0 6px 14px rgba(37,99,235,0.22);
}
.ind-icon svg { width: 20px; height: 20px; }
.ind-card h4 {
  font-size: 0.98rem; font-weight: 700; color: var(--ink); line-height: 1.3;
}
.ind-card p { font-size: 0.82rem; color: var(--muted); margin-top: 0.3rem; }

/* ── PROJECTS ── */
.projects { background: #fff; }
.project-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1rem;
}
.project-item {
  grid-column: span 2;
  position: relative;
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  aspect-ratio: 4 / 3;
}
.project-item--wide {
  grid-column: span 4;
  aspect-ratio: 16 / 10;
}
.project-item--feature {
  grid-column: span 6;
  aspect-ratio: 16 / 9;
}
.project-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.45s ease;
}
.project-item:hover img { transform: scale(1.04); }
.project-item figcaption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 1.6rem 1.1rem 1rem;
  background: linear-gradient(180deg, transparent 0%, rgba(15,23,42,0.78) 100%);
  color: #fff;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.project-item figcaption strong {
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.project-item figcaption span {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.78);
}

/* ── SERVICE AREAS ── */
.areas { background: var(--bg-soft); }

/* ── CONTACT ── */
.contact {
  background: linear-gradient(110deg, var(--navy-deep) 0%, var(--navy) 45%, var(--blue) 100%);
  color: #fff; position: relative; overflow: hidden;
}
.contact::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(700px 380px at 100% 0%, rgba(255,255,255,0.10), transparent 60%),
    radial-gradient(700px 380px at 0% 100%, rgba(234,107,58,0.14), transparent 60%);
  pointer-events: none;
}
.contact-inner { position: relative; z-index: 1; max-width: var(--max); margin: 0 auto; }
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 3rem; align-items: start; }
.contact-info .section-eyebrow { color: #bfdbfe; }
.contact-info h2 {
  font-size: clamp(1.85rem, 3.2vw, 2.55rem); font-weight: 800; color: #fff;
  line-height: 1.15; letter-spacing: -0.02em; margin-bottom: 1rem;
}
.contact-info > p {
  color: rgba(255,255,255,0.78); font-size: 1rem; line-height: 1.65; margin-bottom: 2rem;
  max-width: 480px;
}
.contact-blocks { display: flex; flex-direction: column; gap: 0.85rem; }
.contact-block {
  display: flex; align-items: center; gap: 1rem;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius); padding: 1rem 1.15rem;
}
.contact-block-icon {
  width: 42px; height: 42px; border-radius: 10px;
  background: var(--orange); color: #fff;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.contact-block-icon.subtle { background: rgba(255,255,255,0.14); }
.contact-block-icon svg { width: 18px; height: 18px; }
.contact-block-text { line-height: 1.35; }
.contact-block-text small {
  display: block; font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(255,255,255,0.6); font-weight: 600; margin-bottom: 0.2rem;
}
.contact-block-text strong { font-weight: 600; color: #fff; font-size: 0.98rem; }
.contact-block-text a { color: #fff; text-decoration: underline; text-underline-offset: 3px; }
.contact-block-text a:hover { color: #bfdbfe; }

/* Form card */
.contact-form-card {
  background: #fff; color: var(--ink);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: 0 25px 55px rgba(15,23,42,0.28);
}
.contact-form-card h3 {
  font-size: 1.35rem; font-weight: 800; color: var(--ink); margin-bottom: 1.3rem;
  letter-spacing: -0.01em;
}
.form-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.85rem; margin-bottom: 0.85rem;
}
.form-group { margin-bottom: 0.85rem; display: flex; flex-direction: column; }
.form-group label {
  font-size: 0.85rem; font-weight: 500; color: var(--ink-2); margin-bottom: 0.4rem;
}
.form-group input,
.form-group textarea {
  font-family: var(--font); font-size: 0.95rem; color: var(--ink);
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border); border-radius: 8px; background: #fff;
  outline: none; transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: #cbd5e1; }
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--blue); box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}
.form-group textarea { resize: vertical; min-height: 110px; line-height: 1.5; }
.form-submit {
  width: 100%; padding: 0.95rem 1rem;
  background: linear-gradient(180deg, #ee7644 0%, var(--orange) 100%);
  color: #fff; border: none; border-radius: 8px;
  font-size: 1rem; font-weight: 600; cursor: pointer;
  box-shadow: 0 8px 20px rgba(234,107,58,0.35);
  transition: transform 0.15s, box-shadow 0.2s;
  margin-top: 0.4rem;
}
.form-submit:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 12px 26px rgba(234,107,58,0.42); }
.form-submit:disabled { opacity: 0.7; cursor: not-allowed; }
.form-footnote {
  text-align: center; font-size: 0.82rem; color: var(--muted);
  margin-top: 0.85rem;
}
.form-footnote a { color: var(--blue); font-weight: 600; }
.form-message {
  margin-top: 0.85rem; padding: 0.75rem 0.95rem; border-radius: 8px;
  font-size: 0.9rem; display: none;
}
.form-message.success {
  background: #ecfdf5; border: 1px solid #6ee7b7; color: #047857; display: block;
}
.form-message.error {
  background: #fef2f2; border: 1px solid #fca5a5; color: #b91c1c; display: block;
}

/* ── FOOTER ── */
footer { background: #fff; border-top: 1px solid var(--border-soft); padding: 3rem 1.5rem 1.8rem; }
.footer-inner { max-width: var(--max); margin: 0 auto; }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem;
  padding-bottom: 2.5rem;
}
.footer-brand img { height: 38px; margin-bottom: 1.1rem; }
.footer-brand p { color: var(--muted); font-size: 0.92rem; line-height: 1.65; max-width: 360px; margin-bottom: 1.2rem; }
.footer-brand .legal { font-size: 0.85rem; color: var(--ink-2); }
.footer-brand .legal strong { font-weight: 600; color: var(--ink); }
.footer-col h4 {
  font-size: 0.95rem; font-weight: 700; color: var(--ink); margin-bottom: 1rem;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.55rem; }
.footer-col ul li,
.footer-col ul li a {
  font-size: 0.9rem; color: var(--muted); line-height: 1.45;
}
.footer-col ul li.with-icon a {
  color: var(--ink-2);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.footer-col ul li a:hover { color: var(--blue); }
.footer-col ul li.with-icon {
  display: flex; align-items: flex-start; gap: 0.55rem;
}
.footer-col ul li.with-icon svg {
  width: 15px; height: 15px; color: var(--blue); flex-shrink: 0; margin-top: 3px;
}
.footer-col h4.sub { margin-top: 1.4rem; }
.footer-bottom {
  border-top: 1px solid var(--border-soft); padding-top: 1.4rem;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.6rem;
  font-size: 0.82rem; color: var(--muted);
}

/* ── MOBILE MENU ── */
.mobile-menu { display: none; }

/* ── RESPONSIVE ── */
@media (max-width: 980px) {
  .nav-links { display: none; }
  .nav-phone { display: none; }
  .hamburger { display: inline-flex; }
  .mobile-menu {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    background: #fff; border-bottom: 1px solid var(--border-soft);
    padding: 1.2rem 1.5rem; box-shadow: var(--shadow);
  }
  .mobile-menu.open { display: block; }
  .mobile-menu ul { list-style: none; display: flex; flex-direction: column; gap: 0.9rem; }
  .mobile-menu ul li a { font-weight: 600; color: var(--ink-2); }
  .mobile-menu .mm-phone {
    display: flex; align-items: center; gap: 0.5rem; margin-top: 1rem; padding-top: 1rem;
    border-top: 1px solid var(--border-soft); color: var(--ink); font-weight: 700;
  }
  .mobile-menu .mm-phone svg { width: 16px; height: 16px; color: var(--blue); }

  .hero-inner { grid-template-columns: 1fr; gap: 2.5rem; }
  .why-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .about-media img { max-height: 360px; min-height: 280px; }
  .card-grid-3 { grid-template-columns: 1fr 1fr; }
  .ind-grid { grid-template-columns: 1fr 1fr; }
  .project-grid { grid-template-columns: 1fr 1fr; }
  .project-item,
  .project-item--wide,
  .project-item--feature { grid-column: span 1; aspect-ratio: 4 / 3; }
  .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  section { padding: 3.5rem 1.25rem; }
  .hero { padding: 4rem 1.25rem 4.5rem; }
  .card-grid-3, .ind-grid, .why-cards, .project-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .nav-logo img { height: 56px; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
}

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── BACK TO TOP ── */
.back-to-top {
  position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 90;
  width: 48px; height: 48px; border-radius: 12px; border: none;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(180deg, #ee7644 0%, var(--orange) 100%);
  color: #fff; cursor: pointer;
  box-shadow: 0 8px 22px rgba(234,107,58,0.4);
  opacity: 0; visibility: hidden; pointer-events: none;
  transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s, box-shadow 0.2s;
}
.back-to-top svg { width: 22px; height: 22px; }
.back-to-top.visible {
  opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(234,107,58,0.48);
}
.back-to-top.visible:hover { transform: translateY(-2px); }