/* ============================================================
   快捷键说明弹层
   ============================================================ */
.shortcut-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 3500;
    background: rgba(0, 0, 0, .68);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.shortcut-overlay:target { display: flex; }

.shortcut-box {
    width: 100%;
    max-width: 420px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem 1.6rem 1.3rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: 0 24px 64px rgba(0, 0, 0, .55);
    animation: shortcutIn .3s var(--ease) both;
    max-height: 85vh;
    overflow-y: auto;
}

@keyframes shortcutIn {
    from { opacity: 0; transform: translateY(12px) scale(.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.shortcut-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    font-size: 1.02rem;
    font-weight: 700;
    color: #fff;
}

.shortcut-close {
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface-hover);
    color: var(--text-muted);
    font-size: 0.8rem;
    transition: border-color .25s var(--ease), color .25s var(--ease),
        background .25s var(--ease);
}

.shortcut-close:hover {
    border-color: var(--pink-border);
    background: var(--pink-soft);
    color: var(--pink);
}

.shortcut-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.shortcut-group {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.shortcut-group-title {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding-bottom: 0.2rem;
    border-bottom: 1px dashed var(--border);
}

.shortcut-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--text-dim);
    flex-wrap: wrap;
}

.shortcut-row span {
    margin-left: 0.3rem;
}

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 26px;
    height: 24px;
    padding: 0 0.4rem;
    border-radius: 6px;
    border: 1px solid var(--border-light);
    background: var(--bg);
    color: var(--text);
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
    font-size: 0.72rem;
    font-weight: 600;
    box-shadow: 0 1px 0 rgba(0, 0, 0, .4);
}

.shortcut-btn {
    align-self: stretch;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    border: 1px solid var(--blue-border);
    background: var(--blue-soft);
    color: var(--blue);
    font-size: 0.82rem;
    font-weight: 600;
    transition: background .25s var(--ease), border-color .25s var(--ease);
}

.shortcut-btn:hover {
    background: rgba(96, 165, 250, .2);
    border-color: var(--blue);
    color: #fff;
}

@media (max-width: 640px) {
    .shortcut-box { padding: 1.3rem 1.1rem 1.1rem; }
    .shortcut-title { font-size: 0.95rem; }
}