$fn = 64;

// --- Parameters ---
card_width = 73;             // 70mm card + 3mm clearance for Tarot size
card_length = 123;           // 120mm card + 3mm clearance
tray_height = 40;            // Internal depth of the tray
wall = 2.5;                  // Sturdy wall thickness
base = 2;                    // Base thickness
inner_corner_r = 2.0;        // Inner corner radius to protect card edges
corner_r = inner_corner_r + wall; // Outer corner radius for uniform wall thickness

// --- Derived Dimensions ---
outer_w = card_width + (wall * 2);
outer_l = card_length + (wall * 2);
outer_h = tray_height + base;

difference() {
    // Main Body with rounded corners
    hull() {
        for(x = [-1, 1], y = [-1, 1]) {
            translate([
                x * (outer_w/2 - corner_r), 
                y * (outer_l/2 - corner_r), 
                0
            ]) cylinder(r=corner_r, h=outer_h);
        }
    }

    // Card Cavity with rounded corners
    hull() {
        for(x = [-1, 1], y = [-1, 1]) {
            translate([
                x * (card_width/2 - inner_corner_r), 
                y * (card_length/2 - inner_corner_r), 
                base
            ]) cylinder(r=inner_corner_r, h=outer_h + 1);
        }
    }

    // Long-edge finger cutouts (Left & Right walls for easy grabbing)
    hull() {
        translate([0, 0, base + 25])
            rotate([0, 90, 0])
            cylinder(r=25, h=outer_w + 2, center=true);
        translate([0, 0, outer_h + 25])
            rotate([0, 90, 0])
            cylinder(r=25, h=outer_w + 2, center=true);
    }

    // Short-edge finger cutouts (Front & Back walls for easy tilting)
    hull() {
        translate([0, 0, base + 20])
            rotate([90, 0, 0])
            cylinder(r=20, h=outer_l + 2, center=true);
        translate([0, 0, outer_h + 20])
            rotate([90, 0, 0])
            cylinder(r=20, h=outer_l + 2, center=true);
    }
}