/* ─── Site access gate (login modal) ─────────────────────────────────────── */
body.site-auth-locked {
  overflow: hidden;
}

.site-auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(1, 4, 14, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.site-auth-panel {
  width: 100%;
  max-width: 22rem;
  border-color: rgba(56, 189, 248, 0.18) !important;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.05) inset,
    0 1px 0 rgba(255, 255, 255, 0.06) inset,
    0 28px 64px -12px rgba(0, 0, 0, 0.55),
    0 0 48px -10px rgba(34, 211, 238, 0.14) !important;
}

/* Exam library: compact year / session rails */
.lib-year-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.lib-session-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.lib-session-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}

@media (min-width: 640px) {
  .lib-session-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .lib-session-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1280px) {
  .lib-session-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Subject tabs: scroll horizontally on phones; avoid clipped or shrunk tap targets */
.lib-subject-tab-scroll {
  overflow-x: auto;
  overflow-y: hidden;            /* explicit; avoids spec-forced overflow-y: auto */
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  scrollbar-width: none;         /* hide scrollbar — touch users swipe to scroll */
}
.lib-subject-tab-scroll::-webkit-scrollbar {
  display: none;
}

@media (min-width: 640px) {
  .lib-subject-tab-scroll {
    overflow: visible;
    scrollbar-width: auto;
  }
  .lib-subject-tab-scroll::-webkit-scrollbar {
    display: unset;
  }
}