/* ==========================================================================
   Components: Header & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(7, 12, 24, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(56, 189, 248, 0.12);
  z-index: 1000;
  transition: background var(--transition-normal);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  gap: 0.75rem;
}

.brand-logo__img {
  height: 48px;
  width: auto;
  display: block;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav__list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.75rem;
}

.site-nav__link {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
  padding: 0.5rem 0.25rem;
  position: relative;
}

.site-nav__link:hover,
.site-nav__link.active {
  color: var(--color-accent-cyan);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-cyan);
  transition: width var(--transition-fast);
}

.site-nav__link:hover::after,
.site-nav__link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-sm);
  color: #ffffff;
  padding: 0.5rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* ==========================================================================
   Hero Section & Wide Hero Layout
   ========================================================================== */

.hero {
  position: relative;
  padding: clamp(3rem, 7vw, 6rem) 0 clamp(4rem, 8vw, 7rem) 0;
  overflow: hidden;
  background: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.12) 0%, transparent 60%),
              radial-gradient(circle at 10% 70%, rgba(56, 189, 248, 0.08) 0%, transparent 50%),
              var(--color-bg-primary);
}

.hero--wide {
  padding: clamp(2.5rem, 5vw, 4rem) 0 clamp(3.5rem, 6vw, 5rem) 0;
  text-align: center;
}

.hero-wide-header {
  max-width: 920px;
  margin: 0 auto clamp(2rem, 4vw, 3rem) auto;
}

.hero-wide-image-wrapper {
  position: relative;
  width: 100%;
  max-height: 540px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid rgba(56, 189, 248, 0.25);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7), 0 0 35px rgba(56, 189, 248, 0.15);
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.hero-wide-image {
  width: 100%;
  height: clamp(300px, 45vw, 540px);
  object-fit: cover;
  object-position: center;
  display: block;
}

/* Operational Instructions Steps */
.instructions-section {
  text-align: left;
  margin-top: 2rem;
}

.instructions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.75rem;
  margin-top: 2.5rem;
}

.instruction-step-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.instruction-step-card:hover {
  border-color: var(--color-accent-cyan);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.instruction-step-number {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-accent-cyan);
  margin-bottom: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.instruction-step-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.6rem;
}

.instruction-step-desc {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.page-header-banner {
  padding: clamp(3rem, 6vw, 4.5rem) 0 clamp(2rem, 4vw, 3rem) 0;
  text-align: center;
  background: radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.18) 0%, transparent 70%),
              var(--color-bg-secondary);
  border-bottom: 1px solid rgba(56, 189, 248, 0.12);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  align-items: center;
  gap: clamp(2rem, 5vw, 4rem);
}

.hero__content {
  position: relative;
  z-index: 2;
}

.hero__badge-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.hero__title {
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: #ffffff;
  margin-bottom: 1.25rem;
}

.hero__title-accent {
  background: linear-gradient(135deg, #38bdf8, #60a5fa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__desc {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
  max-width: 580px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1.25rem;
  padding-top: 1.75rem;
  border-top: 1px solid rgba(56, 189, 248, 0.12);
}

.hero__stat-item {
  display: flex;
  flex-direction: column;
}

.hero__stat-value {
  font-size: 1.2rem;
  font-weight: 800;
  color: #ffffff;
  font-family: var(--font-mono);
}

.hero__stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.2rem;
}

.hero__media {
  position: relative;
}

.hero__image-wrapper {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid rgba(56, 189, 248, 0.25);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 30px rgba(56, 189, 248, 0.15);
  background: #020617;
}

.hero__image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.hero__image-wrapper:hover .hero__image {
  transform: scale(1.02);
}

.hero__floating-card {
  position: absolute;
  bottom: -15px;
  right: -15px;
  background: rgba(11, 19, 41, 0.92);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ==========================================================================
   Services Section
   ========================================================================== */

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.service-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-accent-cyan), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.service-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-card-border-hover);
  box-shadow: var(--shadow-glow);
}

.service-card:hover::before {
  opacity: 1;
}

.service-card__icon-box {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-cyan);
  margin-bottom: 1.5rem;
}

.service-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.75rem;
}

.service-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.service-card__list {
  list-style: none;
  border-top: 1px solid rgba(56, 189, 248, 0.1);
  padding-top: 1rem;
}

.service-card__list-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.84rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.service-card__list-item::before {
  content: '✓';
  color: var(--color-accent-cyan);
  font-weight: bold;
}

/* ==========================================================================
   About & Leadership Section
   ========================================================================== */

.about-intro {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-bottom: 3.5rem;
  position: relative;
}

.about-intro__text {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  max-width: 900px;
}

.leadership-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2.25rem;
}

.leader-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.leader-card:hover {
  border-color: var(--color-card-border-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.leader-card__media {
  position: relative;
  background: radial-gradient(circle at 50% 30%, rgba(56, 189, 248, 0.12) 0%, #030712 80%);
  padding: 1.5rem 1.5rem 0.75rem 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  border-bottom: 1px solid rgba(56, 189, 248, 0.15);
}

.leader-card__img {
  width: 100%;
  max-width: 280px;
  height: 340px;
  display: block;
  border-radius: var(--radius-md);
  object-fit: cover;
  object-position: top center;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(56, 189, 248, 0.25);
  transition: transform var(--transition-slow);
}

.leader-card:hover .leader-card__img {
  transform: scale(1.02);
  border-color: var(--color-accent-cyan);
}

.leader-card__content {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.leader-card__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  align-self: flex-start;
}

.leader-card__name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.25rem;
}

.leader-card__title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-accent-cyan);
  margin-bottom: 1rem;
}

.leader-card__bio {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.leader-card__scope {
  border-top: 1px solid rgba(56, 189, 248, 0.1);
  padding-top: 1rem;
}

.leader-card__scope-title {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.leader-card__scope-list {
  list-style: none;
}

.leader-card__scope-item {
  font-size: 0.84rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.leader-card__scope-item::before {
  content: '▸';
  color: var(--color-accent-cyan);
}

/* ==========================================================================
   Gallery Section & Lightbox
   ========================================================================== */

.gallery-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.filter-btn {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--color-text-secondary);
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-accent-blue);
  color: #ffffff;
  border-color: var(--color-accent-cyan);
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.4);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.gallery-card {
  position: relative;
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-normal);
  aspect-ratio: 16 / 10;
}

.gallery-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent-cyan);
  box-shadow: var(--shadow-glow);
}

.gallery-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-slow);
}

.gallery-card:hover .gallery-card__img {
  transform: scale(1.05);
}

.gallery-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(2, 6, 23, 0.95) 0%, rgba(2, 6, 23, 0.3) 50%, transparent 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.25rem;
  opacity: 0.9;
  transition: opacity var(--transition-fast);
}

.gallery-card__tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-accent-cyan);
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.4rem;
}

.gallery-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.25rem;
}

.gallery-card__action {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Lightbox Modal */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(2, 6, 23, 0.95);
  backdrop-filter: blur(16px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.lightbox.is-open {
  display: flex;
  opacity: 1;
}

.lightbox__dialog {
  position: relative;
  max-width: 900px;
  width: 100%;
  background: #0b1329;
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8);
}

.lightbox__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #ffffff;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all var(--transition-fast);
}

.lightbox__close:hover {
  background: var(--color-status-live);
  border-color: var(--color-status-live);
  transform: rotate(90deg);
}

.lightbox__media-box {
  background: #020617;
  display: flex;
  align-items: center;
  justify-content: center;
  max-height: 60vh;
  overflow: hidden;
}

.lightbox__img {
  max-width: 100%;
  max-height: 60vh;
  object-fit: contain;
}

.lightbox__details {
  padding: 1.5rem 2rem;
  border-top: 1px solid rgba(56, 189, 248, 0.15);
}

.lightbox__title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.5rem;
}

.lightbox__caption {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.lightbox__nav-btn {
  position: absolute;
  top: 45%;
  transform: translateY(-50%);
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #ffffff;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lightbox__nav-btn:hover {
  background: var(--color-accent-blue);
  border-color: var(--color-accent-cyan);
}

.lightbox__nav-btn--prev { left: 1rem; }
.lightbox__nav-btn--next { right: 1rem; }

/* ==========================================================================
   Contact Section & Form
   ========================================================================== */

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.contact-info-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.75rem, 3.5vw, 2.5rem);
  display: flex;
  flex-direction: column;
}

.contact-info-card__title {
  font-size: 1.5rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.75rem;
}

.contact-info-card__desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
}

.contact-channel-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.contact-channel {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-channel__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-cyan);
  flex-shrink: 0;
}

.contact-channel__label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.contact-channel__val {
  font-size: 1.125rem;
  font-weight: 700;
  color: #ffffff;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.contact-channel__val:hover {
  color: var(--color-accent-cyan);
}

/* Contact Form */
.contact-form-container {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.75rem, 4vw, 2.75rem);
  position: relative;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 0.45rem;
}

.form-label .required {
  color: var(--color-status-live);
  margin-left: 0.2rem;
}

.form-control {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  background: rgba(7, 12, 24, 0.7);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-md);
  color: #ffffff;
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent-cyan);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.25);
  background: rgba(11, 19, 41, 0.85);
}

.form-control.is-invalid {
  border-color: var(--color-status-live);
  box-shadow: 0 0 10px rgba(239, 68, 68, 0.2);
}

.form-feedback {
  font-size: 0.8rem;
  color: #f87171;
  margin-top: 0.35rem;
  display: none;
}

.form-feedback.is-visible {
  display: block;
}

/* Honeypot field for anti-spam */
.form-hp {
  display: none !important;
  visibility: hidden !important;
}

.form-status-alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
  display: none;
}

.form-status-alert--success {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #34d399;
}

.form-status-alert--error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: #f87171;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: #040711;
  border-top: 1px solid rgba(56, 189, 248, 0.12);
  padding: 4rem 0 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand__desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-top: 1rem;
  max-width: 320px;
}

.footer-col__title {
  font-size: 0.9375rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #ffffff;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
}

.footer-links__item {
  margin-bottom: 0.65rem;
}

.footer-links__link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-links__link:hover {
  color: var(--color-accent-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(56, 189, 248, 0.08);
  padding-top: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer-disclaimer {
  font-size: 0.75rem;
  color: #64748b;
  margin-top: 0.5rem;
}

/* ==========================================================================
   Floating Mobile Call Action
   ========================================================================== */

.floating-dial {
  display: none;
  position: fixed;
  bottom: 1rem;
  left: 1rem;
  right: 1rem;
  z-index: 990;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.7);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--color-accent-blue);
  border-color: var(--color-accent-cyan);
  transform: translateY(-3px);
}