:root {
  --navy: #011c42;
  --navy-2: #062f70;
  --cyan: #7CDDFE;
  --cyan-hot: #0f7ae5;
  --ink: #121212;
  --muted: #595959;
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --line: #e5e9ef;
  --topbar: #1a1a1a;
  --header: #0a0a0a;
  --radius: 2px;
  --max: 1600px;
  --font: "Poppins", system-ui, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
.wrap { width: min(100% - 2.5rem, var(--max)); margin-inline: auto; }
@media (min-width: 1400px) {
  .wrap { width: min(100% - 4rem, var(--max)); }
}

/* Top bar */
.topbar {
  background: var(--topbar);
  color: #fff;
  font-size: 0.85rem;
  overflow: hidden;
}
.topbar-inner,
.topbar .wrap {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 1rem;
  min-height: 48px;
  padding: 0;
  flex-wrap: nowrap;
}
.topbar-left {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  align-items: center;
  padding: 0.55rem 0;
  min-width: 0;
}
.topbar-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: inherit;
}
.topbar-icon {
  flex: 0 0 auto;
  display: block;
  color: currentColor;
}
.topbar-phone {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: stretch;
  margin-right: -1.25rem;
  padding: 0 1.15rem 0 1.4rem;
  background: var(--cyan);
  color: #000;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  font-size: 1.08rem;
  overflow: hidden;
  clip-path: polygon(11px 0, 100% 0, calc(100% - 11px) 100%, 0 100%);
  transition: background 0.2s ease;
  z-index: 1;
}
.topbar-phone-inner {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  white-space: nowrap;
}
.topbar-phone .topbar-icon {
  color: #000;
  width: 17px;
  height: 17px;
}
.topbar-phone::after,
.btn:not(.btn-ghost)::after {
  content: "";
  position: absolute;
  top: 0;
  left: -40%;
  width: 45%;
  height: 100%;
  background: linear-gradient(
    100deg,
    transparent 0%,
    rgba(255, 255, 255, 0.15) 35%,
    rgba(255, 255, 255, 0.7) 50%,
    rgba(255, 255, 255, 0.15) 65%,
    transparent 100%
  );
  transform: translateX(-130%);
  pointer-events: none;
}
.topbar-phone:hover,
.btn:not(.btn-ghost):hover {
  background: #a8ebff;
  color: #000;
}
.topbar-phone:hover::after,
.btn:not(.btn-ghost):hover::after {
  animation: btn-shine 0.85s ease;
}
@keyframes btn-shine {
  from { transform: translateX(-130%); }
  to { transform: translateX(280%); }
}
@media (max-width: 700px) {
  .topbar-inner,
  .topbar .wrap {
    flex-wrap: wrap;
    min-height: 0;
  }
  .topbar-phone {
    margin-right: 0;
    width: 100%;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  }
}

/* Primary site buttons = slanted cyan + shine (matches topbar phone CTA) */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  padding: 0.55rem 1.2rem 0.55rem 1.35rem;
  background: var(--cyan);
  color: #000;
  font-weight: 700;
  letter-spacing: 0.01em;
  border: 0;
  cursor: pointer;
  text-transform: uppercase;
  font-size: 1.08rem;
  overflow: hidden;
  clip-path: polygon(11px 0, 100% 0, calc(100% - 11px) 100%, 0 100%);
  transition: background 0.2s ease;
  text-decoration: none;
}
.btn-sm {
  padding: 0.4rem 0.95rem 0.4rem 1.05rem;
  font-size: 0.92rem;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

/* Exception: outline / non-primary actions (e.g. View Full Gallery) */
.btn-ghost {
  background: transparent;
  border: 2px solid var(--cyan);
  color: var(--cyan);
  clip-path: none;
  overflow: visible;
  padding: 0.55rem 1.25rem;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}
.btn-ghost::after {
  display: none !important;
}
.btn-ghost:hover {
  background: var(--cyan);
  color: #000;
}

/* Header */
.site-header {
  background: var(--header);
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid rgba(124,221,254,.15);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.65rem 0; gap: 1rem;
}
.logo img { height: 58px; width: auto; }
.nav-desktop { display: none; gap: 1.35rem; align-items: center; }
.nav-desktop a { color: #fff; font-weight: 500; font-size: 0.92rem; }
.nav-desktop a:hover, .nav-desktop a.is-active { color: var(--cyan); }
.nav-desktop .has-sub { position: relative; }
.nav-desktop .submenu {
  display: none; position: absolute; top: 100%; left: 0; min-width: 240px;
  background: #111; padding: 0.5rem 0; border: 1px solid rgba(124,221,254,.2);
}
.nav-desktop .has-sub:hover .submenu { display: block; }
.nav-desktop .submenu a { display: block; padding: 0.55rem 1rem; color: #eee; }
.menu-toggle {
  background: transparent; border: 0; color: #fff; font-size: 1.6rem; cursor: pointer;
}
@media (min-width: 900px) {
  .nav-desktop { display: flex; }
  .menu-toggle { display: none; }
}

/* Mobile menu — slide-down open */
.nav-mobile {
  display: block;
  background: #0d0d0d;
  border-top: 1px solid rgba(255,255,255,.08);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition:
    max-height 0.38s ease,
    opacity 0.28s ease,
    transform 0.28s ease;
}
.nav-mobile.open {
  max-height: 26rem;
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.nav-mobile a {
  display: block; color: #fff; padding: 0.85rem 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.nav-mobile a:hover { color: var(--cyan); }
@media (min-width: 900px) {
  .nav-mobile,
  .nav-mobile.open {
    display: none;
    max-height: 0;
    opacity: 0;
    pointer-events: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .nav-mobile {
    transition: none;
    transform: none;
  }
}

/* Hero */
.hero {
  position: relative; min-height: min(78vh, 720px);
  color: #fff; display: grid; place-items: center; text-align: center;
  overflow: hidden;
}
.hero-slides { position: absolute; inset: 0; z-index: 0; }
.hero-slide {
  position: absolute; inset: 0; background-size: cover; background-position: center;
  opacity: 0; transition: opacity 1s ease; transform: scale(1.04);
}
.hero-slide.is-active { opacity: 1; transform: scale(1); transition: opacity 1s ease, transform 8s ease; }
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(180deg, rgba(0,0,0,.55), rgba(1,28,66,.72));
}
.hero-content {
  position: relative;
  z-index: 3;
  padding: 4rem 1.25rem 5.5rem;
  max-width: 1100px;
  width: 100%;
  margin-inline: auto;
  text-align: center;
}
.hero .hero-kicker {
  font-size: clamp(15px, 1.65vw, 22px) !important;
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0 auto 0.85rem;
  max-width: none;
  width: 100%;
  text-transform: uppercase;
  text-align: center;
  white-space: normal;
}
@media (max-width: 900px) {
  .hero .hero-kicker { font-size: 14px !important; letter-spacing: 0.05em; }
}
@media (max-width: 560px) {
  .hero .hero-kicker {
    font-size: 13px !important;
    letter-spacing: 0.04em;
  }
}
.hero-kicker span { color: var(--cyan); }
.hero h1 {
  font-size: clamp(1.85rem, 5.4vw, 4.05rem); line-height: 1.12; margin: 0 0 1.15rem; font-weight: 800;
  text-align: center;
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: normal;
  hyphens: manual;
}
/* Desktop: keep second line on one row; phones must wrap to avoid clipping */
.hero-line2 { white-space: nowrap; }
.hero-accent { color: var(--cyan); }
.hero p:not(.hero-kicker) {
  font-size: clamp(1.02rem, 1.5vw, 1.18rem);
  max-width: 850px;
  margin: 0 auto 1.4rem;
  opacity: .95;
  text-align: center;
}
.hero-content .btn {
  margin-inline: auto;
}
/* Watermark stays behind copy so text/CTA always win the stack */
.hero-watermark {
  position: absolute; right: 4%; bottom: 18%; width: min(220px, 28vw); opacity: .48;
  z-index: 1;
  pointer-events: none;
}
.hero-slash {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 110px;
  z-index: 4;
  line-height: 0;
  pointer-events: none;
}
@media (max-width: 700px) {
  .hero-content {
    padding: 3.25rem 1.35rem 5rem;
  }
  .hero h1 {
    font-size: clamp(1.7rem, 7.2vw, 2.35rem);
    line-height: 1.15;
  }
  .hero-line2 {
    white-space: normal;
  }
  .hero-watermark {
    z-index: 1;
    opacity: 0.34;
    right: 2%;
    bottom: 10%;
    width: min(150px, 38vw);
  }
}
.hero-slash svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* Feature strip under hero */
.feature-strip {
  display: grid; gap: 1.25rem; padding: 1.5rem 0 2.5rem;
  grid-template-columns: 1fr;
}
@media (min-width: 800px) {
  .feature-strip { grid-template-columns: repeat(3, 1fr); }
}
.feature-card {
  display: grid; grid-template-columns: 72px 1fr; gap: 1rem; align-items: start;
  padding: 1rem; background: var(--bg-soft); border-left: 3px solid var(--cyan);
}
.feature-card img { width: 64px; height: 64px; object-fit: contain; }
.feature-card h3 { margin: 0 0 .35rem; font-size: 0.95rem; color: var(--navy); letter-spacing: .03em; }
.feature-card p { margin: 0; font-size: 0.9rem; color: var(--muted); }

/* Sections */
.section { padding: 3.5rem 0; }
.section.alt { background: var(--bg-soft); }
.section-dark {
  background: linear-gradient(135deg, var(--navy), var(--navy-2));
  color: #fff;
}
.section-label {
  font-size: 0.8rem; letter-spacing: .18em; color: var(--cyan-hot); font-weight: 700; margin: 0 0 .4rem;
}
.section-dark .section-label { color: var(--cyan); }
.section h2 {
  margin: 0 0 1rem; font-size: clamp(1.6rem, 3vw, 2.2rem); color: var(--navy);
}
.section-dark h2 { color: #fff; }
.lead { font-size: 1.15rem; font-weight: 600; margin: 0 0 1rem; }
.split {
  display: grid; gap: 2rem; align-items: center;
}
@media (min-width: 900px) {
  .split { grid-template-columns: 1.05fr 0.95fr; }
  .split.reverse { grid-template-columns: 0.95fr 1.05fr; }
  .split.reverse .split-copy { order: 2; }

  /* About home: tall image fills column height; section height unchanged */
  #about-home .split {
    align-items: stretch;
  }
  #about-home .about-media {
    position: relative;
    min-height: 0;
    overflow: hidden;
  }
  #about-home .about-media img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    filter: brightness(1.22) contrast(1.04);
  }
  #about-home .split-copy {
    text-align: right;
  }
  #about-home .split-copy > p:last-child {
    display: flex;
    justify-content: flex-end;
  }
}
.values { display: grid; gap: 1rem; margin-top: 1.5rem; }
@media (min-width: 700px) { .values { grid-template-columns: repeat(3, 1fr); } }
.value {
  background: #fff; border: 1px solid var(--line); padding: 1.1rem; text-align: center;
}
.value img { width: 56px; height: 56px; margin: 0 auto .7rem; object-fit: contain; }
.value h3 { margin: 0 0 .35rem; font-size: 0.88rem; color: var(--navy); }
.value p { margin: 0; font-size: 0.86rem; color: var(--muted); }

/* Services cards */
.cards-3 { display: grid; gap: 1.25rem; }
@media (min-width: 800px) { .cards-3 { grid-template-columns: repeat(3, 1fr); } }
.featured-services h2 {
  text-align: center;
}
.svc-card {
  background: #fff; border: 1px solid var(--line); overflow: hidden;
  transition: transform .2s, box-shadow .2s;
}
.svc-card:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(1,28,66,.12); }
.svc-card img { width: 100%; aspect-ratio: 16/11; object-fit: cover; }
.svc-card .body { padding: 1.1rem 1.15rem 1.35rem; }
.svc-card h3 { margin: 0 0 .5rem; font-size: 1rem; color: var(--navy); letter-spacing: .04em; }
.svc-card p { margin: 0 0 1rem; font-size: 0.9rem; color: var(--muted); }

/* Promo */
.promo {
  position: relative; min-height: 320px; display: grid; place-items: center; text-align: center; color: #fff;
  background-size: cover; background-position: center;
}
.promo::before {
  content: ""; position: absolute; inset: 0; background: rgba(1,28,66,.72);
}
.promo .wrap { position: relative; z-index: 1; padding: 3rem 1rem; }
.promo h2 { color: #fff; margin-bottom: .5rem; }
.promo p { max-width: 520px; margin: 0 auto 1.25rem; }

/* Other services chips */
.chips { display: flex; flex-wrap: wrap; gap: .75rem; }
.chip {
  padding: .7rem 1rem; background: #fff; border: 1px solid var(--line);
  font-weight: 600; font-size: 0.9rem; color: var(--navy);
}
.other-services {
  text-align: center;
}
.other-services .chips {
  justify-content: center;
}

/* Contact form */
.form-grid { display: grid; gap: .85rem; max-width: 640px; }
.form-grid input, .form-grid textarea {
  width: 100%; padding: .85rem 1rem; border: 1px solid var(--line);
  font: inherit; background: #fff;
}
.form-grid textarea { min-height: 140px; resize: vertical; }
.form-note { font-size: 0.85rem; color: var(--muted); margin-top: .5rem; }

/* Gallery — wide before/after composites from legacy site */
.gallery-grid {
  display: grid; gap: .75rem;
  grid-template-columns: 1fr;
}
@media (min-width: 560px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .gallery-grid { grid-template-columns: repeat(3, 1fr); } }
.gallery-grid a {
  display: block; overflow: hidden; aspect-ratio: 1235 / 809; background: #111;
  cursor: zoom-in;
  border-radius: 2px;
}
.gallery-grid img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .35s ease;
}
@media (hover: hover) {
  .gallery-grid a:hover img { transform: scale(1.04); }
}

/* Fullscreen lightbox */
.lb {
  position: fixed; inset: 0; z-index: 200;
  display: none; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, 0.94);
  padding: max(0.75rem, env(safe-area-inset-top)) max(0.75rem, env(safe-area-inset-right)) max(0.75rem, env(safe-area-inset-bottom)) max(0.75rem, env(safe-area-inset-left));
  -webkit-tap-highlight-color: transparent;
}
.lb.is-open { display: flex; }
.lb__stage {
  position: relative;
  width: min(100%, 1200px);
  height: min(82vh, 860px);
  display: grid;
  place-items: center;
  touch-action: pan-y;
}
.lb__img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.45);
}
.lb__btn {
  position: absolute;
  z-index: 2;
  border: 0;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 1.45rem;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  backdrop-filter: blur(4px);
}
.lb__btn:hover,
.lb__btn:focus-visible {
  background: var(--cyan);
  color: #000;
  outline: none;
}
.lb__close { top: 0.65rem; right: 0.65rem; font-size: 1.7rem; }
.lb__prev { left: 0.35rem; top: 50%; transform: translateY(-50%); }
.lb__next { right: 0.35rem; top: 50%; transform: translateY(-50%); }
.lb__count {
  position: absolute;
  left: 50%;
  bottom: 0.35rem;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: rgba(0, 0, 0, 0.35);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
}
body.lb-lock { overflow: hidden; }
@media (max-width: 700px) {
  .lb__stage { height: min(78vh, 720px); width: 100%; }
  .lb__btn { width: 44px; height: 44px; }
  .lb__prev { left: 0.15rem; }
  .lb__next { right: 0.15rem; }
}
@media (prefers-reduced-motion: reduce) {
  .gallery-grid img { transition: none; }
}

/* Page hero */
.page-hero {
  min-height: 260px; display: grid; place-items: end start;
  background-size: cover; background-position: center; color: #fff; position: relative;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(1,28,66,.85), rgba(1,28,66,.35));
}
.page-hero .wrap { position: relative; z-index: 1; padding: 3.5rem 0 2rem; }
.page-hero h1 { margin: 0; font-size: clamp(1.8rem, 4vw, 2.8rem); }

/* Service page */
.svc-list { list-style: none; padding: 0; margin: 0 0 1.5rem; }
.svc-list li { margin: 0 0 .45rem; }
.svc-list a { color: var(--navy-2); font-weight: 600; }
.svc-list a:hover { color: var(--cyan-hot); }

/* Footer */
.site-footer {
  background: #0a0a0a; color: #ddd; padding: 3rem 0 1.5rem; font-size: 0.92rem;
}
.footer-grid {
  display: grid; gap: 1.75rem;
}
@media (min-width: 800px) {
  .footer-grid { grid-template-columns: 1.3fr 1fr 1fr 1fr; }
}
.site-footer h4 {
  margin: 0 0 .8rem; color: var(--cyan); font-size: 0.85rem; letter-spacing: .12em;
}
.site-footer a:hover { color: var(--cyan); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: 0 0 .4rem; }
.footer-bottom {
  margin-top: 2rem; padding-top: 1rem; border-top: 1px solid rgba(255,255,255,.1);
  display: flex; flex-wrap: wrap; gap: .75rem 1.25rem; justify-content: space-between;
  font-size: 0.82rem; color: #999;
}
.social-row {
  display: flex; flex-wrap: wrap; gap: 0.85rem; align-items: center; margin-top: 0.55rem;
}
.social-row a {
  display: inline-flex; width: 36px; height: 36px; align-items: center; justify-content: center;
  transition: transform .15s ease, opacity .15s ease;
}
.social-row a:hover { transform: translateY(-2px); opacity: 0.85; }
.social-row img {
  width: 28px; height: 28px; object-fit: contain;
  filter: brightness(0) invert(1);
}

.gallery-cta {
  margin-top: 1.25rem;
  display: flex;
  justify-content: center;
  text-align: center;
}
.gallery-home h2 {
  text-align: center;
}
.contact-intro {
  text-align: center;
}
.contact-intro .form-grid {
  margin-inline: auto;
  text-align: left;
}
.contact-intro .form-grid .btn {
  justify-self: center;
}
.hp-field {
  position: absolute !important;
  left: -9999px !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
}
.form-status {
  display: none;
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
}
.form-status.show { display: block; }
.form-status.ok { color: #0a7a3a; }
.form-status.err { color: #b42318; }
.form-grid { position: relative; }

/* Mobile centering / polish (MASTER 2026-10-01; About page 2026-10-05) */
@media (max-width: 799px) {
  #about-home .split-copy,
  #about-home .split-copy p,
  #about-home .split-copy h2 {
    text-align: center;
  }
  #about-home .split-copy .btn {
    margin-inline: auto;
  }
  #about-home .split-copy > p:last-child {
    display: flex;
    justify-content: center;
  }
  #about-home .values {
    justify-items: center;
  }

  /* About page: center hero title + intro copy */
  #about-hero {
    place-items: end center;
  }
  #about-hero .wrap,
  #about-hero h1 {
    text-align: center;
    width: 100%;
  }

  /* Gallery page: center hero title on mobile */
  #gallery-hero {
    place-items: end center;
  }
  #gallery-hero .wrap,
  #gallery-hero h1 {
    text-align: center;
    width: 100%;
  }
  #about-page .split-copy,
  #about-page .split-copy h2,
  #about-page .split-copy p {
    text-align: center;
  }
  #about-page .split-copy .btn {
    display: flex;
    width: max-content;
    margin-inline: auto;
  }

  /* Service pages: center copy + CTA on mobile only */
  .svc-page .svc-copy,
  .svc-page .svc-copy h2,
  .svc-page .svc-copy h3,
  .svc-page .svc-copy p {
    text-align: center;
  }
  .svc-page .svc-list {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .svc-page .svc-copy .btn {
    display: flex;
    width: max-content;
    margin-inline: auto;
  }

  .featured-services h2,
  .featured-services .svc-card .body {
    text-align: center;
  }
  .featured-services .svc-card .body .btn,
  .featured-services .svc-card .body .btn-sm {
    margin-inline: auto;
  }

  .other-services h2,
  .other-services .chips {
    text-align: center;
  }
  .other-services .chips {
    justify-content: center;
  }

  .contact-intro h2,
  .contact-intro > p {
    text-align: center;
  }

  /* Contact page: center intro copy only (form unchanged) */
  .contact-page .contact-copy,
  .contact-page .contact-copy h2,
  .contact-page .contact-copy p {
    text-align: center;
  }

  .gallery-home h2,
  .gallery-cta {
    text-align: center;
  }
  .gallery-cta {
    display: flex;
    justify-content: center;
  }

  .site-footer,
  .footer-grid > div,
  .footer-bottom {
    text-align: center;
  }
  .footer-grid > div ul {
    padding: 0;
  }
  .social-row {
    justify-content: center;
  }
  .footer-bottom {
    justify-content: center;
  }
}

/* Back to top — thicker chevron, optically centered in circle */
.back-top {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 40;
  width: 46px; height: 46px; border-radius: 50%; border: 0;
  background: var(--cyan); color: transparent; font-size: 0; cursor: pointer;
  opacity: 0; pointer-events: none; transition: opacity .2s, background .2s;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  line-height: 0;
}
.back-top::before {
  content: "";
  display: block;
  width: 13px;
  height: 13px;
  border-left: 4px solid #000;
  border-top: 4px solid #000;
  /* rotate makes geometric center sit high — nudge down into true center */
  transform: translateY(4px) rotate(45deg);
  box-sizing: border-box;
  margin: 0;
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { background: #a8ebff; }