.h2a-memory {
    margin-top: 24px;
    padding: 20px;
    border: 1px solid #b8c9d8;
    border-radius: 6px;
    background: #f7fafc;
}
.h2a-memory h3 { margin-top: 0; }
.h2a-memory-controls { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.h2a-memory-controls[hidden] { display: none; }
.h2a-memory-controls button:focus-visible { outline: 3px solid #172f48; outline-offset: 3px; }
.h2a-memory-status { padding: 12px; border-left: 4px solid #337ab7; background: #e9f2fa; }
.h2a-memory-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 40px minmax(0, 1fr);
    gap: 16px 8px;
    align-items: stretch;
}
.h2a-memory-stack-title { grid-area: 1 / 1; color: #245580; }
.h2a-memory-heap-title { grid-area: 1 / 3; color: #7b4c0b; }
.h2a-memory-car { grid-area: 2 / 1; }
.h2a-memory-no-target { grid-area: 2 / 3; align-self: center; color: #555; }
.h2a-memory-rectangle-pointer { grid-area: 3 / 1; }
.h2a-memory-rectangle-arrow { grid-area: 3 / 2; }
.h2a-memory-rectangle { grid-area: 3 / 3; }
.h2a-memory-student-pointer { grid-area: 4 / 1; }
.h2a-memory-student-arrow { grid-area: 4 / 2; }
.h2a-memory-student { grid-area: 4 / 3; }
.h2a-memory-card { padding: 14px; border: 2px solid #337ab7; border-radius: 6px; background: #fff; overflow-wrap: anywhere; }
.h2a-memory-card strong { display: block; margin-bottom: 10px; }
.h2a-memory-card p { margin: 10px 0; }
.h2a-memory-card span { display: block; margin-top: 10px; font-size: 13px; }
.h2a-memory-card code { white-space: normal; overflow-wrap: anywhere; }
.h2a-memory-rectangle, .h2a-memory-student { border-color: #9b681c; background: #fff9ee; }
.h2a-memory-arrow { align-self: center; text-align: center; font-size: 30px; color: #245580; }
.h2a-memory-card.is-freed { border-style: dashed; border-color: #777; background: #eee; color: #555; }
.h2a-memory-card.is-dangling { border-color: #a12622; background: #fff0ef; }
.h2a-memory-arrow.is-inactive { visibility: hidden; }
.h2a-memory-note { margin: 18px 0 0; color: #555; }
@media (max-width: 700px) {
    .h2a-memory { padding: 12px; }
    .h2a-memory-grid { grid-template-columns: minmax(0, 1fr); gap: 10px; }
    .h2a-memory-grid > * { grid-area: auto; }
    .h2a-memory-stack-title, .h2a-memory-heap-title { display: none; }
    .h2a-memory-card::before { content: 'PINO'; display: block; font-size: 12px; font-weight: bold; margin-bottom: 8px; }
    .h2a-memory-rectangle::before, .h2a-memory-student::before { content: 'KEKO'; }
    .h2a-memory-arrow { transform: rotate(90deg); line-height: 1; }
    .h2a-memory-no-target { margin-bottom: 14px; }
}