/* Shared session gate: a quiet exercise book, not simulated progress. */
.gm-session-loading {
    position: fixed;
    inset: 0;
    z-index: 60;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    padding: 32px;
    background: #fbf6ea;
    color: #13233f;
    text-align: center;
}
.gm-session-loading[hidden] { display: none; }
.gm-session-loading .gm-boot-mark { width: 112px; height: 112px; object-fit: contain; opacity: 1; mix-blend-mode: multiply; }
.gm-session-loading .gm-session-label { margin: 0; font: 600 18px/1.5 "Space Grotesk", sans-serif; }
.gm-session-book {
    position: relative;
    display: block;
    width: 116px;
    height: 78px;
    margin: 4px 0 8px;
    border: 2px solid #13233f;
    border-radius: 5px 5px 9px 9px;
    background: #fffdf8;
    box-shadow: 0 5px 0 #edcf83, 0 7px 0 #13233f;
    perspective: 400px;
}
.gm-session-book::before, .gm-session-book::after {
    content: "";
    position: absolute;
    top: 14px;
    width: 32px;
    height: 1px;
    background: #b9ae90;
    box-shadow: 0 10px 0 #b9ae90, 0 20px 0 #b9ae90, 0 30px 0 #b9ae90;
}
.gm-session-book::before { left: 11px; }
.gm-session-book::after { right: 11px; }
.gm-session-book i {
    position: absolute;
    z-index: 1;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 50%;
    border-left: 1px solid #ba795f;
    border-right: 1px solid #b9ae90;
    border-radius: 0 4px 6px 0;
    background: #f1e6cb;
    transform-origin: left center;
    animation: gmSessionPage 2.4s cubic-bezier(.22, .61, .36, 1) infinite;
}
@keyframes gmSessionPage {
    0%, 15% { transform: rotateY(0deg); }
    65%, 100% { transform: rotateY(-180deg); }
}
@media (prefers-reduced-motion: reduce) {
    .gm-session-book i { animation: none; transform: rotateY(-150deg); }
}