:root {
    --bg: #0b0f1a;
    --panel: #121a2b;
    --text: #e8efff;
    --muted: #9fb0d6;
    --border: #2c3b61;
    --btn: #1b2742;
    --btn-text: #e8efff;
    --link: #9ec1ff;
    --canvas-bg: #000;
}

html[data-theme="light"] {
    --bg: #eef3ff;
    --panel: #ffffff;
    --text: #10203f;
    --muted: #4f638f;
    --border: #c8d6f5;
    --btn: #e7eeff;
    --btn-text: #10203f;
    --link: #204ea8;
    --canvas-bg: #000;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    min-height: 100%;
}

.container {
    width: min(1280px, 95vw);
    margin: 0 auto;
}

.topbar {
    border-bottom: 1px solid var(--border);
    background: var(--panel);
    position: sticky;
    top: 0;
    z-index: 20;
}

.topbar-row {
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.topnav {
    display: flex;
    gap: 14px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-link {
    color: var(--link);
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 6px 10px;
}

.nav-link:hover,
.nav-link.active {
    border-color: var(--border);
    background: color-mix(in srgb, var(--panel) 65%, var(--bg) 35%);
}

.theme-toggle {
    border: 1px solid var(--border);
    background: var(--btn);
    color: var(--btn-text);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
}

.page-content {
    display: grid;
    gap: 14px;
    padding: 14px 0 24px;
}

.page-panel {
    border: 1px solid var(--border);
    background: var(--panel);
    border-radius: 12px;
    padding: 14px;
}

.canvas-wrap {
    display: grid;
    place-items: center;
    margin-top: 8px;
}

canvas {
    background: var(--canvas-bg);
    border: 1px solid var(--border);
    max-width: 100%;
    height: auto;
    display: block;
    outline: none;
}

.muted {
    color: var(--muted);
}