$fn = 64;

// --- PARAMETERS ---
stand_width = 60;      // Width of the stand
base_length = 85;      // Total depth of the base
backrest_length = 75;  // Length of the backrest
backrest_angle = 65;   // Angle of the backrest (degrees)
phone_gap = 14;        // Gap for the phone (fits most phones with cases)
lip_height = 15;       // Height of the front holding lip
thickness = 6;         // Thickness of the structural arms

// --- CALCULATED POINTS ---
// Offset by thickness/2 to keep all geometry positive and perfectly aligned
pt_front_top    = [thickness/2, thickness/2 + lip_height];
pt_front_bot    = [thickness/2, thickness/2];
pt_base_back    = [thickness/2 + base_length, thickness/2];

pt_backrest_bot = [thickness/2 + phone_gap + thickness, thickness/2];
pt_backrest_top = [
    pt_backrest_bot[0] + backrest_length * cos(backrest_angle),
    pt_backrest_bot[1] + backrest_length * sin(backrest_angle)
];

// --- MODULES ---
// Creates a thick line between two points with rounded ends
module skeleton_line(p1, p2, t) {
    hull() {
        translate(p1) circle(d=t);
        translate(p2) circle(d=t);
    }
}

// --- MAIN GEOMETRY ---
// Extruded and laid flat on its side for optimal 3D printing without supports
linear_extrude(height = stand_width) {
    union() {
        // Front holding lip
        skeleton_line(pt_front_bot, pt_front_top, thickness);
        
        // Bottom base
        skeleton_line(pt_front_bot, pt_base_back, thickness);
        
        // Angled backrest
        skeleton_line(pt_backrest_bot, pt_backrest_top, thickness);
        
        // Rear support leg (forms a stable A-frame)
        skeleton_line(pt_backrest_top, pt_base_back, thickness);
    }
}