:root {
    --bg: #0f1419;
    --panel: #1a2332;
    --text: #e8eef6;
    --muted: #9aa8b8;
    --line: #2a3a4e;
    --accent: #5b9fd4;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    background: radial-gradient(900px 420px at 0% -10%, #1d3a55 0%, transparent 55%), var(--bg);
    font-family: "SF Pro Text", "PingFang SC", "Hiragino Sans GB", sans-serif;
    color-scheme: dark;
}

a { color: #7eb6e8; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 28px 20px 48px; }

header h1 { margin: 8px 0 4px; font-size: 28px; font-weight: 600; }

.sub { margin: 0; color: var(--muted); }

.layout {
    display: grid;
    grid-template-columns: minmax(280px, 1fr) 320px;
    gap: 20px;
    margin-top: 22px;
    align-items: start;
}

.stage { width: 100%; max-width: 780px; }

canvas {
    width: 100%;
    aspect-ratio: 1;
    display: block;
    background: #070910;
    border: 1px solid var(--line);
    border-radius: 12px;
    cursor: grab;
    touch-action: none;
}

canvas.dragging { cursor: grabbing; }

.status { min-height: 2.6em; margin: 10px 2px 0; color: var(--muted); font-size: 13px; }

.panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 14px;
    position: sticky;
    top: 16px;
    max-height: calc(100vh - 32px);
    overflow: auto;
}

.panel h2 { margin: 2px 0 12px; font-size: 16px; }

.field { margin-bottom: 12px; }

.label-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-size: 13px;
}

output {
    color: var(--accent);
    font-family: ui-monospace, Menlo, monospace;
    font-size: 12px;
}

.hint { margin: 6px 0 0; color: var(--muted); font-size: 12px; }

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

.check { display: flex; gap: 8px; align-items: center; font-size: 14px; }

.presets, .button-row { display: flex; flex-wrap: wrap; gap: 6px; }

button {
    font: inherit;
    color: var(--text);
    background: #121a24;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 7px 10px;
    cursor: pointer;
}

button:hover { border-color: var(--accent); }

.notes { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }

.notes ul { margin: 0; padding-left: 18px; }

kbd {
    font-family: ui-monospace, Menlo, monospace;
    border: 1px solid #3a4c62;
    border-bottom-width: 2px;
    border-radius: 4px;
    padding: 0 5px;
    background: #121a24;
    color: var(--text);
}

@media (max-width: 900px) {
    .layout { grid-template-columns: 1fr; }
    .panel { position: static; max-height: none; }
}