$fn = 64;

// --- Parameters ---
card_width = 41;
card_length = 63;
tolerance = 3;       // Clearance for easy card insertion and sleeves

wall = 2.5;          // Outer wall thickness
base_t = 3;          // Base floor thickness
tray_h = 35;         // Total height of the tray
tilt_angle = 6;      // Angle to tilt cards backward

stack_lip = 2;       // Height of the bottom stacking lip
stack_tol = 0.4;     // Clearance for modular stacking

// --- Calculated Dimensions ---
in_w = card_width + tolerance;
in_l = card_length + tolerance;
out_w = in_w + wall * 2;
out_l = in_l + wall * 2;

// --- Main Model ---
union() {
    difference() {
        // Main outer body
        cube([out_w, out_l, tray_h]);

        // Inner card cavity
        translate([wall, wall, base_t])
            cube([in_w, in_l, tray_h]);

        // Front thumb cutout
        translate([out_w / 2, 0, base_t + 15]) {
            translate([0, 0, tray_h / 2])
                cube([24, wall * 4, tray_h], center = true);
            rotate([90, 0, 0])
                cylinder(h = wall * 4, d = 24, center = true);
        }

        // Left finger cutout
        translate([0, out_l / 2, base_t + 16]) {
            translate([0, 0, tray_h / 2])
                cube([wall * 4, 30, tray_h], center = true);
            rotate([0, 90, 0])
                cylinder(h = wall * 4, d = 30, center = true);
        }

        // Right finger cutout
        translate([out_w, out_l / 2, base_t + 16]) {
            translate([0, 0, tray_h / 2])
                cube([wall * 4, 30, tray_h], center = true);
            rotate([0, 90, 0])
                cylinder(h = wall * 4, d = 30, center = true);
        }
    }

    // Internal wedge to tilt cards backward
    translate([wall, wall, base_t])
        hull() {
            cube([in_w, in_l, 0.01]);
            cube([in_w, 0.01, in_l * tan(tilt_angle)]);
        }

    // Bottom stacking lip
    translate([wall + stack_tol, wall + stack_tol, -stack_lip])
        cube([in_w - stack_tol * 2, in_l - stack_tol * 2, stack_lip + 0.01]);
}