.hidden {
  display: none !important;
}

.max-h-0 {
  max-height: 0;
}

body.menu-open {
  overflow: hidden;
}

header {
  padding: 20px 32px;
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.logo-text {
  font-weight: 700;
  font-size: 24px;
  letter-spacing: -0.02em;
  color: var(--text-main);
  transition: opacity 0.32s ease, transform 0.32s ease;
  opacity: calc(1 - var(--header-progress));
  transform: translate3d(calc(var(--header-progress) * -10px), calc(var(--header-progress) * -8px), 0);
  white-space: nowrap;
}

.logo-image {
  position: relative;
  opacity: 1;
  transform:
    translate3d(calc(var(--header-progress) * 6px), 0, 0)
    rotate(calc(var(--logo-spin-progress) * 1turn))
    scale(calc(1 - (var(--header-progress) * 0.06)));
  transition: transform 0.42s cubic-bezier(0.22, 1, 0.36, 1), filter 0.32s ease;
  will-change: transform;
  max-width: 100%;
  margin: 0 auto;
  display: block;
  transform-origin: center;
  filter: drop-shadow(0 10px 18px rgba(0, 158, 161, calc(var(--logo-spin-progress) * 0.18)));
}

.logo-image::after {
  content: "";
  position: absolute;
  inset: -8px;
  border-radius: 999px;
  background: conic-gradient(
    from 180deg,
    rgba(0, 158, 161, 0) 0deg,
    rgba(0, 158, 161, 0.16) 90deg,
    rgba(96, 165, 250, 0.2) 180deg,
    rgba(0, 158, 161, 0) 315deg
  );
  opacity: calc(var(--logo-spin-progress) * 0.9);
  transform: scale(calc(0.82 + (var(--logo-spin-progress) * 0.18)));
  transition: opacity 0.32s ease, transform 0.42s cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
  z-index: -1;
}

section[id],
footer[id] {
  scroll-margin-top: var(--anchor-offset);
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
}

.nav-link:hover {
  color: var(--primary-color);
}

.nav-btn {
  padding: 10px 20px;
  background: var(--secondary-color);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: background 0.2s ease;
}

.nav-btn:hover {
  background: var(--secondary-hover);
  color: #fff;
  opacity: 1;
}

.mobile-toggle {
  display: none;
  width: 48px;
  min-width: 48px;
  height: 48px;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-size: 24px;
  color: var(--text-main);
  position: relative;
  z-index: 101;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.mobile-toggle span {
  pointer-events: none;
}

.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: 98;
  backdrop-filter: blur(4px);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 73px;
  left: 0;
  right: 0;
  padding-top: 10px;
  background: var(--bg-mobile-menu);
  border-bottom: 1px solid var(--border-color);
  z-index: 99;
  overflow: hidden;
  transition: max-height 0.3s ease-in-out;
  box-shadow: var(--shadow-md);
  max-height: 0;
}

.mobile-menu.menu-open {
  max-height: 500px;
}

.mobile-link {
  display: block;
  padding: 16px 32px;
  font-weight: 600;
  border-bottom: 1px solid #f0f0f0;
}

.mobile-link:last-child {
  border-bottom: none;
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }

  .mobile-toggle {
    display: block;
  }

  .mobile-overlay {
    display: block;
  }

  .mobile-menu {
    display: block;
  }
}