.app {
    padding: 1rem;
}

.panel {
    display: flex;
    gap: 1rem;
    align-items: stretch;
    max-width: 1400px;
    margin: 0 auto;
}

.viewer {
    flex: 1;
    min-width: 0;
}

.viewer iframe {
    width: 100%;
    height: 70vh;
    min-height: 420px;
    border: 0;
    border-radius: 8px;
    background: #111;
}

.sidebar {
    width: 320px;
    flex-shrink: 0;
}

.sidebar h2 {
    margin-top: 0;
}

.sidebar--intro {
    opacity: 0.7;
    font-size: 0.9rem;
}

.modules {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.module {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 0.75rem;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.06);
    cursor: pointer;
    user-select: none;
    transition: background 0.15s;
}

.module:hover {
    background: rgba(255, 255, 255, 0.12);
}

.module input {
    accent-color: #1caad9;
}

.module--key {
    margin-left: auto;
    min-width: 1.5rem;
    padding: 0.1rem 0.35rem;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    background: rgba(0, 0, 0, 0.35);
    font-family: inherit;
    font-size: 0.75rem;
    text-align: center;
    opacity: 0.85;
}

.module--none span {
    opacity: 0.6;
    font-style: italic;
}

.module--sub {
    margin-left: 1.5rem;
    background: rgba(28, 170, 217, 0.12);
    font-size: 0.9rem;
}

.slot {
    margin-bottom: 1.2rem;
}

.slot h3 {
    margin: 0 0 0.5rem;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.65;
}

.loading {
    opacity: 0.6;
    font-style: italic;
}

@media (max-width: 900px) {
    .panel {
        flex-direction: column;
    }

    .sidebar {
        width: auto;
    }
}