/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  transition: background var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.97);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
}

.logo img {
  height: 2.25rem;
  width: auto;
}

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

.nav-desktop a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition);
  position: relative;
}

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

.nav-desktop a.active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-desktop a.active::after {
  content: '';
  position: absolute;
  bottom: -0.375rem;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

/* 有横图 Banner 的内页：顶栏透明时导航用浅色，避免 active 与蓝底同色 */
body:has(.page-banner) .site-header:not(.scrolled) .nav-desktop a {
  color: rgba(255, 255, 255, 0.88);
}

body:has(.page-banner) .site-header:not(.scrolled) .nav-desktop a:hover {
  color: #fff;
}

body:has(.page-banner) .site-header:not(.scrolled) .nav-desktop a.active {
  color: #fff;
}

body:has(.page-banner) .site-header:not(.scrolled) .nav-desktop a.active::after {
  background: var(--color-accent);
  height: 3px;
}

body:has(.page-banner) .site-header:not(.scrolled) .logo {
  color: #fff;
}

body:has(.page-banner) .site-header:not(.scrolled) .nav-toggle {
  color: #fff;
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--color-primary);
}

.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1001;
  pointer-events: none;
}

.nav-mobile.open {
  pointer-events: auto;
}

.nav-mobile-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  opacity: 0;
  transition: opacity var(--transition);
}

.nav-mobile.open .nav-mobile-overlay {
  opacity: 1;
}

.nav-mobile-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(18rem, 85vw);
  height: 100%;
  background: var(--color-surface);
  padding: 5rem 1.5rem 2rem;
  transform: translateX(100%);
  transition: transform var(--transition);
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
}

.nav-mobile.open .nav-mobile-panel {
  transform: translateX(0);
}

.nav-mobile-panel a {
  display: block;
  padding: 0.875rem 0;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}

.nav-mobile-panel a.active {
  color: var(--color-primary);
  font-weight: 600;
  background: rgba(33, 115, 244, 0.08);
  margin: 0 -0.75rem;
  padding-left: 0.75rem;
  padding-right: 0.75rem;
  border-radius: var(--radius-sm);
}

.nav-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  font-size: 1.25rem;
  color: var(--color-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:hover {
  transform: scale(1.02);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(33, 115, 244, 0.35);
}

.btn-primary:hover {
  background: var(--color-secondary);
  box-shadow: 0 6px 24px rgba(33, 115, 244, 0.45);
}

.btn-accent {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(244, 160, 36, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

/* Footer */
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 3.5rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-brand .logo {
  color: #fff;
  margin-bottom: 1rem;
}

.footer-brand p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: #94a3b8;
}

.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer-col a {
  display: block;
  font-size: 0.9375rem;
  color: #94a3b8;
  padding: 0.375rem 0;
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid #334155;
  text-align: center;
  font-size: 0.875rem;
  color: #64748b;
}

.footer-disclaimer {
  font-size: 0.8125rem;
  color: #64748b;
  margin-top: 0.75rem;
  line-height: 1.6;
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1100;
  background: var(--color-surface);
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.1);
  padding: 1.25rem 0;
  transform: translateY(100%);
  transition: transform var(--transition);
}

.cookie-banner.show {
  transform: translateY(0);
}

.cookie-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.cookie-text {
  flex: 1;
  min-width: 15rem;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

.cookie-text a {
  color: var(--color-primary);
  text-decoration: underline;
}

.cookie-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.cookie-actions .btn {
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
}

.btn-decline {
  background: var(--color-border);
  color: var(--color-text);
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 900;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: var(--shadow-hover);
  opacity: 0;
  visibility: hidden;
  transform: translateY(1rem);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-secondary);
  transform: scale(1.05);
}

@media (max-width: 767px) {
  .nav-desktop {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-mobile {
    display: block;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .cookie-inner {
    flex-direction: column;
    align-items: stretch;
  }

  .cookie-actions {
    flex-direction: column;
  }

  .cookie-actions .btn {
    width: 100%;
  }
}

@media (min-width: 768px) and (max-width: 1199px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}