:root {
    color-scheme: dark;
    font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at 10% 20%, #020617 0%, #000 60%);
    --panel-bg: rgba(8, 11, 25, 0.9);
    --panel-border: rgba(255, 255, 255, 0.12);
    --accent: #7dd3fc;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.app {
    position: relative;
    width: 100%;
    height: 100%;
}

.viewport {
    position: absolute;
    inset: 0;
}

.viewport canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

#fractalCanvas {
    background: #020617;
    cursor: grab;
}

#fractalCanvas.dragging {
    cursor: grabbing;
}

#zoomOverlay {
    pointer-events: none;
}

.controls {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    backdrop-filter: blur(8px);
    color: #fff;
    min-width: 220px;
}

.controls-body {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.controls.collapsed .controls-body {
    display: none;
}

.collapse-btn {
    align-self: flex-end;
    border-radius: 999px;
    border: 1px solid var(--panel-border);
    padding: 0.3rem 0.9rem;
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    cursor: pointer;
    font-size: 0.85rem;
}

.control-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

button,
select,
input[type="number"] {
    border-radius: 0.6rem;
    border: 1px solid var(--panel-border);
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    padding: 0.5rem 0.65rem;
    font-size: 0.95rem;
    transition: border-color 0.2s ease, color 0.2s ease;
}

button:hover,
select:focus-visible,
input[type="number"]:focus-visible {
    border-color: var(--accent);
    color: var(--accent);
    outline: none;
}

.inline {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    text-transform: uppercase;
    font-size: 0.8rem;
}

.toggle.active {
    border-color: var(--accent);
    background: rgba(125, 211, 252, 0.15);
    color: var(--accent);
}

label {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

@media (max-width: 640px) {
    .controls {
        width: calc(100% - 2rem);
    }

    .control-row {
        grid-template-columns: 1fr;
    }
}