/* ============================================
   Header & Navigation
   ============================================ */
header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border-light);
  padding: calc(var(--spacing-unit) * 0.5) 0;
  margin-bottom: var(--spacing-3xl);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

/* In-progress banner (mobile only) */
#in-progress-banner-container {
  position: sticky;
  top: 0;
  z-index: 95;
  display: none; /* Hidden by default; enabled only for mobile via media query */
}

.in-progress-banner {
  background: linear-gradient(120deg,
    var(--color-primary),
    var(--color-primary-dark),
    var(--color-primary)
  );
  background-size: 200% 200%;
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-lg);
  animation: inProgressBannerGlow 8s ease-in-out infinite;
}

@keyframes inProgressBannerGlow {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.in-progress-banner-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  font-size: 0.875rem;
}

.in-progress-banner-label {
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.in-progress-banner-time {
  font-weight: 700;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

header h1 {
  margin: 0;
}

.app-logo a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.15em;
  text-decoration: none;
}

.app-logo-wordmark {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.app-logo-drive {
  color: var(--color-primary);
}

a:hover .app-logo-drive {
  color: var(--color-primary-dark);
}

.app-logo-50 {
  color: var(--color-text-secondary);
}

a:hover .app-logo-50 {
  color: var(--color-text);
}

.header-nav {
  position: relative;
}

header nav {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  flex-wrap: wrap;
}

header nav span {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
}

section header {
  z-index: 1;
  display: block;
  background: none;
  box-shadow: none;
  border: none;
  margin: 0 0 var(--spacing-md);
  font-size: 0.875rem;
  text-align: left;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* Mobile */
@media (max-width: 768px) {
  header {
    display: none;
  }

  header .container {
    padding: 0 var(--spacing-lg);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  header nav {
    width: 100%;
    justify-content: flex-start;
  }

  header nav span {
    display: none;
  }

  section header {
    font-size: 0.875rem;
    text-align: center;
  }

  /* Show in-progress banner only on mobile */
  #in-progress-banner-container {
    display: block;
  }
}

@media (max-width: 480px) {
  header h1 {
    font-size: 1.25rem;
  }

  header .container {
    padding: 0 var(--spacing-md);
  }
}

/* Dark mode header tweaks */
[data-theme="dark"] header,
body[data-theme="dark"] header {
  background-color: var(--color-surface);
  border-bottom-color: var(--color-border);
  box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.6), 0 1px 2px -1px rgb(0 0 0 / 0.7);
}