.sn-nav {
  --sn-ink: #182235;
  --sn-ink-soft: #304056;
  --sn-primary: #2155ff;
  --sn-primary-dark: #153dbf;
  --sn-accent: #c76d2a;
  --sn-paper: rgba(255, 253, 248, 0.94);
  --sn-paper-strong: rgba(255, 253, 248, 0.98);
  --sn-line: rgba(188, 174, 152, 0.48);
  --sn-line-strong: rgba(188, 174, 152, 0.8);
  --sn-shadow: 0 18px 36px rgba(24, 34, 53, 0.1);
  --sn-shadow-soft: 0 12px 26px rgba(24, 34, 53, 0.08);
  position: sticky;
  top: 0;
  z-index: 30;
  background: linear-gradient(180deg, rgba(255, 253, 248, 0.96) 0%, rgba(249, 243, 235, 0.92) 100%);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--sn-line);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.55);
}

.sn-nav-wrap {
  width: min(1200px, 92%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
}

.sn-brand {
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--sn-ink);
  text-decoration: none;
  font-size: 2rem;
  line-height: 1;
}

.sn-brand span {
  color: var(--sn-primary);
}

.sn-menu {
  display: flex;
  list-style: none;
  gap: 6px;
  margin: 0;
  padding: 0;
  align-items: center;
  flex-wrap: nowrap;
}

.sn-menu a {
  color: var(--sn-ink-soft);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 10px 12px;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.sn-menu a:hover {
  background: rgba(33, 85, 255, 0.08);
  color: var(--sn-primary-dark);
  transform: translateY(-1px);
}

.sn-research {
  position: relative;
}

.sn-research > summary {
  list-style: none;
  color: var(--sn-ink-soft);
  font-weight: 700;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  padding: 10px 12px;
  border-radius: 999px;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.sn-research > summary::-webkit-details-marker {
  display: none;
}

.sn-research > summary::after {
  content: "\25BE";
  margin-left: 6px;
  font-size: 0.82rem;
}

.sn-research[open] > summary::after {
  content: "\25B4";
}

.sn-research.is-active > summary,
.sn-research[open] > summary,
.sn-research > summary:hover {
  background: rgba(33, 85, 255, 0.08);
  color: var(--sn-primary-dark);
  transform: translateY(-1px);
}

.sn-research-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  min-width: 290px;
  background: var(--sn-paper-strong);
  border: 1px solid var(--sn-line);
  border-radius: 18px;
  box-shadow: var(--sn-shadow);
  padding: 10px;
  display: grid;
  gap: 4px;
  z-index: 40;
}

.sn-research-menu a {
  display: block;
  color: var(--sn-ink-soft);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.92rem;
  padding: 10px 12px;
  border-radius: 12px;
}

.sn-research-menu a:hover {
  background: rgba(33, 85, 255, 0.08);
  color: var(--sn-primary-dark);
}

.sn-research-menu a.active {
  background: rgba(24, 34, 53, 0.08);
  color: var(--sn-ink);
}

.sn-menu-toggle {
  display: none;
  border: 1px solid var(--sn-line-strong);
  background: var(--sn-paper-strong);
  color: var(--sn-ink);
  border-radius: 14px;
  padding: 8px 10px;
  cursor: pointer;
  font-weight: 800;
  line-height: 1;
  min-width: 44px;
  min-height: 44px;
  box-shadow: var(--sn-shadow-soft);
}

.sn-menu-toggle-icon {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
}

.sn-menu-toggle-icon span {
  width: 18px;
  height: 2px;
  background: var(--sn-ink);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.sn-menu-toggle.is-open .sn-menu-toggle-icon span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.sn-menu-toggle.is-open .sn-menu-toggle-icon span:nth-child(2) {
  opacity: 0;
}

.sn-menu-toggle.is-open .sn-menu-toggle-icon span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.sn-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sn-mobile-menu {
  display: block;
  position: fixed;
  inset: 0;
  background: rgba(10, 14, 22, 0.56);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 35;
}

.sn-mobile-menu.open {
  opacity: 1;
  pointer-events: auto;
}

.sn-mobile-wrap {
  position: absolute;
  right: 0;
  top: 0;
  width: min(88vw, 360px);
  height: 100%;
  background: linear-gradient(180deg, rgba(255, 253, 248, 0.99) 0%, rgba(248, 243, 235, 0.97) 100%);
  border-left: 1px solid var(--sn-line);
  padding: 78px 16px 18px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.25s ease;
  box-shadow: -18px 0 36px rgba(24, 34, 53, 0.12);
}

.sn-mobile-menu.open .sn-mobile-wrap {
  transform: translateX(0);
}

.sn-mobile-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.sn-mobile-list a {
  display: block;
  color: var(--sn-ink);
  text-decoration: none;
  font-weight: 700;
  padding: 13px 10px;
  min-height: 48px;
  border-bottom: 1px solid rgba(188, 174, 152, 0.46);
  border-radius: 10px;
}

.sn-mobile-list .sn-mobile-cta {
  margin-top: 8px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: linear-gradient(135deg, var(--sn-accent), #f08c41);
  color: #fff;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 14px 28px rgba(199, 109, 42, 0.22);
}

body.sn-menu-open {
  overflow: hidden;
}

@media (max-width: 1180px) {
  .sn-nav-wrap {
    width: min(1200px, 96%);
    gap: 12px;
  }

  .sn-brand {
    font-size: 1.86rem;
  }

  .sn-menu {
    gap: 2px;
  }

  .sn-menu a,
  .sn-research > summary {
    font-size: 0.89rem;
    padding: 9px 10px;
  }

  .sn-research-menu a {
    font-size: 0.9rem;
  }
}

@media (max-width: 768px) {
  .sn-nav-wrap {
    width: min(1200px, calc(100% - 28px));
    padding: 12px 0;
  }

  .sn-brand {
    font-size: 1.8rem;
  }

  .sn-menu {
    display: none;
  }

  .sn-menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .sn-research-menu {
    position: static;
    min-width: 0;
    box-shadow: none;
    margin-top: 8px;
  }

  .sn-nav-wrap {
    position: relative;
    z-index: 40;
  }
}

@media (min-width: 769px) {
  .sn-mobile-menu {
    display: none;
  }
}