/**
 * Shared site header — matches index.html sticky bar, nav, and mobile drawer.
 * Scope .btn-link under .site-header so card/footer buttons are unaffected.
 */
.site-header {
  border-bottom: 1px solid rgba(226, 232, 240, 0.75);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-header .logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: inherit;
}

.site-header .logo img {
  height: 38px;
  width: auto;
  display: block;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.top-nav a {
  color: #64748b;
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 500;
}

.top-nav a:hover {
  color: #4da6e7;
}

.site-header .btn-link {
  text-decoration: none;
  border: 1px solid #e2e8f0;
  color: #1e293b;
  padding: 0.6rem 1rem;
  border-radius: 12px;
  font-weight: 600;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.site-header .btn-link:hover {
  border-color: #4da6e7;
  color: #1d4ed8;
}

.mobile-nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  background: #fff;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex-direction: column;
  cursor: pointer;
}

.mobile-nav-toggle span {
  width: 18px;
  height: 2px;
  background: #334155;
  border-radius: 2px;
  transition: 0.2s ease;
}

.mobile-nav-toggle.active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.mobile-nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-nav-toggle.active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 1200px) {
  .top-nav {
    gap: 0.6rem;
  }

  .top-nav a {
    font-size: 0.8rem;
  }
}

@media (max-width: 992px) {
  .mobile-nav-toggle {
    display: flex;
  }

  .top-nav {
    position: fixed;
    top: 70px;
    right: -100%;
    width: min(320px, 86vw);
    height: calc(100vh - 70px);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(16px) saturate(160%);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
    border-left: 1px solid #e2e8f0;
    box-shadow: -12px 0 32px rgba(15, 23, 42, 0.12);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 0.2rem;
    padding: 1rem;
    overflow-y: auto;
    transition: right 0.25s ease;
    z-index: 120;
  }

  .top-nav.active {
    right: 0;
  }

  .top-nav a:not(.btn-link),
  .top-nav .btn-link {
    display: block;
    width: 100%;
    font-size: 0.95rem;
    padding: 0.7rem 0.55rem;
    border-radius: 10px;
    box-sizing: border-box;
  }

  .top-nav .btn-link {
    margin-top: 0.4rem;
    text-align: center;
  }
}