html,
body {
    margin: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: Arial, Helvetica, sans-serif;
    background: #070b14;
    color: #f3f6fb;
}

* {
    box-sizing: border-box;
}

.app-shell {
    display: flex;
    width: 100%;
    height: 100%;
}

.sidebar {
    width: 330px;
    min-width: 330px;
    padding: 20px;
    overflow-y: auto;
    background: rgba(8, 14, 26, 0.97);
    border-right: 1px solid rgba(255, 255, 255, 0.09);
    z-index: 3;
}

.brand h1 {
    margin: 0 0 8px;
    font-size: 28px;
}

.brand p,
.note p {
    margin: 0;
    color: #b8c3d9;
    line-height: 1.45;
}

.panel {
    margin-top: 16px;
    padding: 16px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.045);
}

.panel h2 {
    margin: 0 0 14px;
    font-size: 18px;
}

.field-label {
    display: block;
    margin: 12px 0 7px;
    color: #c9d5ea;
    font-size: 14px;
}

input,
select,
button {
    width: 100%;
    min-height: 42px;
    border-radius: 8px;
    font-size: 14px;
}

input,
select {
    padding: 10px 12px;
    border: 1px solid rgba(255, 255, 255, 0.13);
    background: rgba(0, 0, 0, 0.28);
    color: #ffffff;
}

button {
    margin-top: 10px;
    border: 0;
    padding: 10px 12px;
    cursor: pointer;
    background: #2c7df0;
    color: #ffffff;
}

button:hover {
    filter: brightness(1.08);
}

.toggle {
    display: flex;
    gap: 10px;
    align-items: center;
    margin: 12px 0;
    color: #dbe6ff;
    cursor: pointer;
}

.toggle input {
    width: 18px;
    min-height: 18px;
}

.status-box {
    min-height: 42px;
    padding: 10px 12px;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.28);
    color: #d7e3ff;
}

.viewer-wrap {
    position: relative;
    flex: 1;
    min-width: 0;
    background:
        radial-gradient(circle at 70% 25%, rgba(65, 92, 145, 0.18), transparent 32%),
        #030712;
}

#solar-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

#label-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.planet-label {
    position: absolute;
    transform: translate(-50%, -50%);
    padding: 3px 7px;
    border-radius: 8px;
    background: rgba(5, 9, 17, 0.68);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: #edf4ff;
    font-size: 12px;
    white-space: nowrap;
    text-shadow: 0 1px 3px #000;
}

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

    .sidebar {
        width: 100%;
        min-width: 100%;
        max-height: 48vh;
        border-right: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.09);
    }
}