:root {
    --card-padding: var(--space-4);
    --card-radius: 12px;
    --ruler-tick-width: 1.5px;
    --ruler-tick-height: 10px;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-5) var(--space-3);
}

#demo-01 {
    width: 100%;
    max-width: 580px;
}

/* ---- Card ---- */

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--card-radius);
    padding: var(--card-padding);
    position: relative;
    overflow: hidden;
}

/* Subtle graph-paper grid */
.card::before {
    --line-color: color(from var(--border) srgb r g b / 0.04);
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--line-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--line-color) 1px, transparent 1px);
    background-size: var(--space-2) var(--space-2);
    pointer-events: none;
}

.card__label {
    display: block;
    font-size: 0.7em;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: var(--space-2);
    position: relative;
}

.card__footer {
    display: flex;
    justify-content: flex-end;
    margin-top: var(--space-1);
}

.card__footer button {
    font-size: 0.875em;
}

/* ---- Text specimen ---- */

#movie-quote {
    position: relative;
    margin-bottom: var(--space-0);
    white-space: nowrap;
}

#movie-quote span {
    font-family: "Lora", Georgia, serif;
    font-size: 1.4em;
    font-weight: 400;
    color: var(--text);
    display: inline-block;
    position: relative;
    padding-block: var(--space-1);
}

/* ---- Measurement ruler ---- */

.measurement-row {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
}

#ruler {
    position: relative;
    width: 0;
    min-width: 2px;
    height: 1px;
    background: var(--accent);
    transition: width 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Left tick */
#ruler::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: var(--ruler-tick-width);
    height: var(--ruler-tick-height);
    background: var(--accent);
    border-radius: 1px;
}

/* Right tick */
#ruler::after {
    content: "";
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: var(--ruler-tick-width);
    height: var(--ruler-tick-height);
    background: var(--accent);
    border-radius: 1px;
}

#display-size {
    font-family: monospace;
    font-size: 0.8em;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: -0.02em;
}