:root {
    --primary: #C8102E;
    --secondary: #1D428A;
    --text: #1f2937;
    --muted: #64748b;
    --line: #d8dee8;
    --panel: #ffffff;
    --bg: #f5f7fb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background: var(--bg);
}

.viewer-shell {
    width: min(1180px, calc(100vw - 32px));
    margin: 0 auto;
    padding: 24px 0;
}

.viewer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-bottom: 18px;
    border-bottom: 3px solid var(--primary);
}

.viewer-header h1 {
    margin: 0 0 4px;
    font-size: 2rem;
    line-height: 1.15;
    color: var(--secondary);
}

.viewer-header p {
    margin: 0;
    color: var(--muted);
    font-size: 0.98rem;
}

.status-pill {
    flex: 0 0 auto;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 8px 12px;
    color: var(--secondary);
    background: var(--panel);
    font-weight: 700;
    font-size: 0.82rem;
    text-transform: uppercase;
}

.viewer-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    grid-template-areas:
        "slice controls"
        "three controls";
    gap: 24px;
    align-items: start;
    padding-top: 24px;
}

.canvas-panel,
.three-panel,
.controls-panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 6px 24px rgba(15, 23, 42, 0.08);
}

.canvas-panel {
    grid-area: slice;
    display: grid;
    gap: 12px;
    padding: 16px;
}

.three-panel {
    grid-area: three;
}

.controls-panel {
    grid-area: controls;
}

#fusion-canvas {
    display: block;
    width: 100%;
    max-height: calc(100vh - 190px);
    background: #000;
    border-radius: 6px;
    image-rendering: auto;
}

#three-view {
    width: 100%;
    height: min(520px, 62vh);
    min-height: 360px;
    overflow: hidden;
    background: #05070b;
    border-radius: 6px;
}

#three-view canvas {
    display: block;
}

.slice-readout {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding-top: 12px;
    color: var(--muted);
    font-size: 0.92rem;
}

.slice-controls {
    display: grid;
    grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
    gap: 12px;
    align-items: end;
    padding-top: 4px;
}

.slice-slider-group {
    min-width: 0;
}

.controls-panel {
    display: grid;
    gap: 18px;
    padding: 18px;
}

.control-group {
    display: grid;
    gap: 8px;
}

.control-group label {
    color: var(--secondary);
    font-weight: 700;
    font-size: 0.9rem;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
    cursor: ew-resize;
}

.segmented {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    padding: 4px;
    border-radius: 8px;
    background: #e9eef7;
}

.segmented.two-up {
    grid-template-columns: repeat(2, 1fr);
}

.segmented button {
    border: 0;
    border-radius: 6px;
    padding: 9px 8px;
    background: transparent;
    color: var(--muted);
    font-weight: 700;
    cursor: pointer;
}

.segmented button.active {
    color: #fff;
    background: var(--secondary);
}

.metadata-list {
    display: grid;
    gap: 12px;
    margin: 0;
}

.metadata-list div {
    padding-top: 12px;
    border-top: 1px solid var(--line);
}

.metadata-list dt {
    margin-bottom: 4px;
    color: var(--secondary);
    font-weight: 800;
    font-size: 0.82rem;
    text-transform: uppercase;
}

.metadata-list dd {
    margin: 0;
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.45;
}

@media (max-width: 860px) {
    .viewer-shell {
        width: min(100vw - 16px, 560px);
        padding: 12px 0;
    }

    .viewer-layout {
        grid-template-columns: 1fr;
        grid-template-areas:
            "slice"
            "controls"
            "three";
        gap: 14px;
        padding-top: 14px;
    }

    .viewer-header {
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
        padding-bottom: 12px;
    }

    .viewer-header h1 {
        font-size: 1.45rem;
    }

    .viewer-header p {
        font-size: 0.9rem;
    }

    .canvas-panel,
    .controls-panel {
        padding: 10px;
    }

    #fusion-canvas {
        max-height: none;
        border-radius: 5px;
    }

    .slice-readout {
        align-items: flex-start;
        flex-direction: column;
        gap: 4px;
        padding-top: 0;
        font-size: 0.84rem;
    }

    .slice-controls {
        grid-template-columns: 1fr;
        gap: 10px;
        padding-top: 0;
    }

    .controls-panel {
        gap: 12px;
    }

    .metadata-list {
        gap: 8px;
    }

    #three-view {
        min-height: 320px;
    }
}