html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: Arial, Helvetica, sans-serif;
    background: #0b1220;
    color: #f3f6fb;
}

* {
    box-sizing: border-box;
}

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

.sidebar {
    width: 320px;
    min-width: 320px;
    background: rgba(10, 18, 32, 0.96);
    border-right: 1px solid rgba(255, 255, 255, 0.08);
    padding: 20px;
    overflow-y: auto;
}

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

.brand p {
    margin: 0 0 24px;
    color: #b8c3d9;
    line-height: 1.5;
}

.panel {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: 14px;
    padding: 16px;
    margin-bottom: 16px;
}

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

.toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    cursor: pointer;
}

button {
    width: 100%;
    margin-bottom: 10px;
    padding: 12px 14px;
    border: 0;
    border-radius: 10px;
    font-size: 15px;
    cursor: pointer;
    background: #2c7df0;
    color: #fff;
}

button:hover {
    filter: brightness(1.05);
}

#status-box {
    min-height: 42px;
    padding: 10px 12px;
    border-radius: 10px;
    background: rgba(0, 0, 0, 0.25);
    color: #d7e3ff;
}

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

#cesiumContainer {
    width: 100%;
    height: 100%;
}

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

    .sidebar {
        width: 100%;
        min-width: 100%;
        height: 280px;
        border-right: 0;
        border-bottom: 1px solid rgba(255,255,255,0.08);
    }
}

.field-label {
    display: block;
    margin: 12px 0 6px;
    font-size: 14px;
    color: #c9d5ea;
}

select {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.12);
    background: rgba(0,0,0,0.25);
    color: #ffffff;
    font-size: 14px;
    margin-bottom: 8px;
}