/**
 * Base Styles - Reset and foundational elements
 */

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

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: var(--color-bg);
    font-family: var(--font-family);
    color: var(--color-line);
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-base);
}

/* Canvas Container */
#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-canvas);
}

#oscilloscope {
    width: min(100vw, 100vh);
    height: min(100vw, 100vh);
    display: block;
}

/* Start Screen */
#startScreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--color-bg);
    z-index: var(--z-overlay);
}

/* Scale Ruler */
.scale-ruler {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 5px 10px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    text-align: center;
    display: flex;
    align-items: center;
    gap: 5px;
    z-index: var(--z-ruler);
    transition: opacity var(--transition-slow);
}

.scale-line {
    display: inline-block;
    height: 2px;
    width: 60px;
    background: linear-gradient(
        to right,
        white 0%, white 20%, transparent 20%, transparent 40%,
        white 40%, white 60%, transparent 60%, transparent 80%,
        white 80%, white 100%
    );
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.controls-hidden {
    opacity: 0;
    pointer-events: none;
}

.controls-visible {
    opacity: 1;
    pointer-events: all;
}