.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(247, 249, 252, 0.82);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid rgba(35, 48, 115, 0.07);
  transition:
    background var(--dur-base) var(--ease-smooth),
    box-shadow var(--dur-base) var(--ease-smooth);
}

.site-header.scrolled {
  background: rgba(247, 249, 252, 0.97);
  box-shadow: var(--shadow-md);
  border-bottom-color: rgba(35, 48, 115, 0.12);
}

.nav-inner {
  display: flex;
  align-items: center;
  height: var(--nav-height);
  gap: var(--space-8);
}

.nav-brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-brand-logo {
  height: 40px;
  width: auto;
}

.nav-collapse {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: 1;
  gap: var(--space-6);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-soft);
  white-space: nowrap;
  transition:
    color var(--dur-fast) var(--ease-smooth),
    background var(--dur-fast) var(--ease-smooth);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: var(--space-4);
  right: var(--space-4);
  height: 2px;
  border-radius: 2px;
  background: var(--color-yellow);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease-spring);
}

.nav-link:hover {
  color: var(--color-navy);
  background: rgba(35, 48, 115, 0.05);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.nav-link.active {
  color: var(--color-navy);
  font-weight: 600;
}

.nav-link--admin {
  background: rgba(35, 48, 115, 0.06);
  color: var(--color-navy);
  font-weight: 600;
}

.nav-link--admin:hover {
  background: var(--color-navy);
  color: var(--color-white);
}

.nav-link--admin::after {
  display: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.nav-hello {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-light);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-soft);
}

.nav-hello::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4caf50;
  flex-shrink: 0;
}

.nav-hello strong {
  color: var(--color-navy);
  font-weight: 700;
}

.nav-logout {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-soft);
  background: none;
  border: 1.5px solid transparent;
  transition: all var(--dur-fast) var(--ease-smooth);
}

.nav-logout:hover {
  color: #d32f2f;
  border-color: rgba(211, 47, 47, 0.22);
  background: rgba(211, 47, 47, 0.05);
}

.nav-btn-login {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-navy);
  border: 2px solid rgba(35, 48, 115, 0.2);
  background: transparent;
  transition: all var(--dur-fast) var(--ease-smooth);
}

.nav-btn-login:hover {
  border-color: var(--color-navy);
  background: rgba(35, 48, 115, 0.05);
}

.nav-btn-register {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-navy);
  background: var(--color-yellow);
  border: none;
  box-shadow: 0 4px 14px rgba(255, 202, 87, 0.38);
  transition: all var(--dur-base) var(--ease-smooth);
}

.nav-btn-register:hover {
  background: var(--color-yellow-dark);
  box-shadow: 0 6px 20px rgba(255, 202, 87, 0.55);
  transform: translateY(-2px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-navy);
  border-radius: 2px;
  transform-origin: center;
  transition:
    transform var(--dur-base) var(--ease-smooth),
    opacity var(--dur-base) var(--ease-smooth),
    width var(--dur-base) var(--ease-smooth);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
  width: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.page-body {
  flex: 1;
  padding-top: var(--nav-height);
}

.site-footer {
  background: var(--color-navy);
  color: rgba(255, 255, 255, 0.75);
  padding-top: var(--space-16);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 88, 163, 0.5) 0%, transparent 70%);
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: -60px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(143, 195, 227, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  height: 40px;
  margin-bottom: var(--space-5);
  filter: brightness(1.5);
  opacity: 1;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}

.footer-brand-name span {
  color: var(--color-sky);
}

.footer-tagline {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.65;
  max-width: 28ch;
  margin-bottom: var(--space-6);
}

.footer-socials {
  display: flex;
  gap: var(--space-3);
}

.footer-social-link {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--dur-fast) var(--ease-smooth);
}

.footer-social-link:hover {
  background: var(--color-yellow);
  border-color: var(--color-yellow);
  color: var(--color-navy);
  transform: translateY(-3px);
}

.footer-col-title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-5);
}

.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-nav-list a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.55);
  transition: color var(--dur-fast) var(--ease-smooth);
}

.footer-nav-list a::before {
  content: "";
  width: 0;
  height: 1px;
  background: var(--color-yellow);
  transition: width var(--dur-fast) var(--ease-smooth);
}

.footer-nav-list a:hover {
  color: var(--color-white);
}

.footer-nav-list a:hover::before {
  width: 12px;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.footer-contact-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: rgba(255, 202, 87, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 15px;
}

.footer-contact-text {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.5;
}

.footer-contact-text strong {
  display: block;
  color: var(--color-white);
  font-weight: 600;
  margin-bottom: 2px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  padding-block: var(--space-5);

  & .docs-collapse {
    display: flex;
    gap: 5px;

    a {
      font-size: var(--text-xs);
      color: rgba(255, 255, 255, 0.4);
      letter-spacing: 0.02em;
      transition: color var(--dur-fast) var(--ease-smooth);

      &:hover {
        color: var(--color-white);
      }
    }
  }
}

.footer-copyright {
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.02em;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
  }
}

@media screen and (max-width: 830px) {
  .footer-bottom {
    justify-content: center;
  }
}

@media (max-width: 700px) {
  .nav-toggle {
    display: flex;
  }

  .nav-collapse {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--space-4);
    background: rgba(247, 249, 252, 0.98);
    backdrop-filter: blur(20px);
    padding: var(--space-5) var(--space-6) var(--space-6);
    border-bottom: 1px solid rgba(35, 48, 115, 0.1);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(-12px);
    pointer-events: none;
    transition:
      opacity var(--dur-base) var(--ease-smooth),
      transform var(--dur-base) var(--ease-smooth);
  }

  .nav-collapse.open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
  }

  .nav-actions {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
  }
}

@media screen and (max-width: 560px) {
  .footer-bottom {
    & .docs-collapse {
      display: none;
    }
  }
}