:root {
    --primary-color: #cbc2ed;
    --secondary-color: #07e3d5;

    --background-color: #e5eff2;
    --text-color: #0f0e0e;

    --font-family: 'Arial', sans-serif;
    --font-size: 16px;
    --border-radius: 4px;
}

body {
    width: 100vw;
    height: 100vh;
    background: var(--background-color);
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    overflow: hidden;

    position: relative;
}

/* ── Gravity base ── */
.gravity {
    position: relative;
}

/* ── Horizontal menu ── */
.horizontal-menu {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);

    display: flex;
    flex-direction: row;
    gap: 1px;

    box-sizing: border-box;
}

.horizontal-menu a {
    display: flex;
    align-items: center;
    justify-content: center;

    padding: 20px 40px;

    /* ── Glassmorphism ── */
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(14px) saturate(1.4);
    -webkit-backdrop-filter: blur(14px) saturate(1.4);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow:
        0 4px 24px rgba(0, 0, 0, 0.06),
        inset 0 1px 0 rgba(255, 255, 255, 0.35);

    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-decoration: none;
    text-transform: uppercase;

    border-radius: 0;
    transition: background 0.25s ease, box-shadow 0.25s ease;
}

.horizontal-menu a:first-child {
    border-radius: 10px 0 0 10px;
}

.horizontal-menu a:last-child {
    border-radius: 0 10px 10px 0;
}

/* ── Vertical menu (kept for reference) ── */
.vertical-menu {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);

    background: var(--primary-color);
    grid-area: left;

    display: inline-flex;
    flex-direction: column;
    justify-content: center;
}

main {
    background: var(--background-color);
    grid-area: content;
    box-sizing: border-box;
}