/* bluish theme variables (local to this page) */
:root {
    --color-bg:           #0d0d1a;
    --color-primary:      #00aaff;
    --color-primary-dim:  #0055aa;
    --color-primary-bright: #88ddff;
    --color-accent:       #ffaa00;
    --color-text:         #e0e0e0;
    --color-text-dim:     #888888;
    --font-mono: 'Courier New', Courier, monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    background: var(--color-bg);
    overflow: hidden;
    width: 100vw;
    height: 100vh;
}

/* fullscreen canvas — animation sits behind everything */
#cnv {
    position: fixed;
    top: 0; left: 0;
    width: 100vw;
    height: 100vh;
    display: block;
}

/* --- Gear button --- */
#gear-btn {
    position: fixed;
    top: 10px;
    right: 10px;
    background: transparent;
    border: 1px solid var(--color-primary-dim);
    color: var(--color-primary);
    width: 32px;
    height: 32px;
    padding: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.45;
    transition: opacity 0.2s, border-color 0.2s;
    z-index: 100;
}
#gear-btn:hover {
    opacity: 1;
    border-color: var(--color-primary);
}

/* --- Settings panel --- */
#settings-panel {
    display: none;
    position: fixed;
    top: 10px;
    right: 10px;
    background: rgba(13, 13, 26, 0.92);
    border: 1px solid var(--color-primary-dim);
    box-shadow: 0 0 20px rgba(0, 170, 255, 0.08);
    color: var(--color-text);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.05em;
    padding: 14px 16px 12px;
    z-index: 100;
    min-width: 230px;
}

.sp-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.sp-row label {
    width: 46px;
    flex-shrink: 0;
    color: var(--color-text-dim);
    letter-spacing: 0.08em;
}

.sp-row span {
    width: 26px;
    text-align: right;
    flex-shrink: 0;
    color: var(--color-primary);
}

.sp-row input[type="range"] {
    flex: 1;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.sp-row select {
    flex: 1;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--color-primary-dim);
    color: var(--color-primary);
    font-family: inherit;
    font-size: inherit;
    padding: 2px 0;
    cursor: pointer;
    outline: none;
}

.sp-row select option {
    background: var(--color-bg);
    color: var(--color-text);
}

#sp-hide {
    display: block;
    width: 100%;
    margin-top: 6px;
    background: transparent;
    border: 1px solid var(--color-primary-dim);
    color: var(--color-text-dim);
    font-family: inherit;
    font-size: inherit;
    letter-spacing: 0.12em;
    padding: 4px;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
}
#sp-hide:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}