/**
 * Flying Toasters, based on after-dark-css:
 * https://github.com/bryanbraun/after-dark-css
 *
 * HTML & CSS copyright Bryan Braun, MIT license
 * Original screensaver & images copyright Berkeley Systems
 */
#toasters {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: -2;
}

#toasters .toaster, #toasters .toast {
    position: absolute;
    width: 64px;
    height: 64px;
}
#toasters .toaster {
    background-image: url("toaster-sprite.gif");
}
#toasters .toast {
    background-image: url("toast1.gif");
}

/**
 * Toaster animations.
 *
 * t1 is fastest, t2 is mid speed & flaps out of sequence with t1,
 * t3 is the common speed, t4 is a delayed batch at the fastest
 * speed, and t5-t9 are delayed batches at the common speed.
 */
.t1 { animation: flap .2s steps(4) infinite alternate, fly 16s linear infinite; }
.t2 { animation: flap .2s steps(4) infinite alternate-reverse, fly 25.6s linear infinite; }
.t3 { animation: flap .2s steps(4) infinite alternate, fly 38.4s linear infinite; }
.t4 { animation: flap .2s steps(4) infinite alternate, fly 16s 8s linear infinite; }
.t5 { animation: flap .2s steps(4) infinite alternate-reverse, fly 38.4s 6.4s linear infinite; }
.t6 { animation: flap .2s steps(4) infinite alternate, fly 38.4s 12.8s linear infinite; }
.t7 { animation: flap .2s steps(4) infinite alternate-reverse, fly 38.4s 19.2s linear infinite; }
.t8 { animation: flap .2s steps(4) infinite alternate, fly 38.4s 25.6s linear infinite; }
.t9 { animation: flap .2s steps(4) infinite alternate-reverse, fly 38.4s 32s linear infinite; }

/* Toast animations: tst1 fast, tst2 mid, tst3 common, tst4 delayed. */
.tst1 { animation: fly 16s linear infinite; }
.tst2 { animation: fly 25.6s linear infinite; }
.tst3 { animation: fly 38.4s linear infinite; }
.tst4 { animation: fly 38.4s 19.2s linear infinite; }

/**
 * Starting positions, one per object so they don't overlap,
 * in percentages so they suit any window size. Organized into
 * reverse "L" shaped batches to keep a constant flow.
 */
/* Batch 1 (-10% to -20%), top edge right to left */
.p6 { right: -2%; top: -17%; }
.p7 { right: 10%; top: -19%; }
.p8 { right: 20%; top: -18%; }
.p9 { right: 30%; top: -20%; }
.p10 { right: 40%; top: -21%; }
.p11 { right: 50%; top: -18%; }
.p12 { right: 60%; top: -20%; }
/* Right side, top to bottom */
.p13 { right: -17%; top: 10%; }
.p14 { right: -19%; top: 20%; }
.p15 { right: -21%; top: 30%; }
.p16 { right: -23%; top: 50%; }
.p17 { right: -25%; top: 70%; }

/* Batch 2 (-20% to -40%), top edge right to left */
.p18 { right: 0%; top: -26%; }
.p19 { right: 10%; top: -20%; }
.p20 { right: 20%; top: -36%; }
.p21 { right: 30%; top: -24%; }
.p22 { right: 40%; top: -33%; }
.p23 { right: 60%; top: -40%; }
/* Right side, top to bottom */
.p24 { right: -26%; top: 10%; }
.p25 { right: -36%; top: 30%; }
.p26 { right: -29%; top: 50%; }

/* Batch 3 (-40% to -60%), top edge right to left */
.p27 { right: 0; top: -46%; }
.p28 { right: 10%; top: -56%; }
.p29 { right: 20%; top: -49%; }
.p30 { right: 30%; top: -60%; }
/* Right side, top to bottom */
.p31 { right: -46%; top: 10%; }
.p32 { right: -56%; top: 20%; }
.p33 { right: -49%; top: 30%; }

@keyframes flap {
    from { background-position: 0px; }
    to { background-position: -256px; }
}

/* Moving 1600px down, to accommodate large screens. The real
   toasters fly an isometric 2:1 path, so twice as far across. */
@keyframes fly {
    from { transform: translate(0, 0); }
    to { transform: translate(-3200px, 1600px); }
}