*, *:before, *:after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  font-size: 62.5%;
  height: 100%;
  overflow: hidden;
}

.instant {
  -webkit-transition: 0 0 !important;
          transition: 0 0 !important;
}

.scene {
  position: relative;
  height: 100%;
  background: #fff;
  -webkit-transition: -webkit-transform 0.5s;
          transition: transform 0.5s;
  will-change: transform;
}
.scene.menu-visible .menu__btn {
  background: #000;
  color: #000;
}
.scene.menu-visible .menu__btn:after {
  -webkit-transform: scale(1.5) !important;
      -ms-transform: scale(1.5) !important;
          transform: scale(1.5) !important;
}
.scene.menu-visible .menu__heading {
  opacity: 0.6;
  -webkit-transition: opacity 0.5s 1.7s;
          transition: opacity 0.5s 1.7s;
}

/* 
.content {
  position: relative;
  height: 100%;
  -webkit-transition: -webkit-transform 0.6s, opacity 0.4s 0.1s;
          transition: transform 0.6s, opacity 0.4s 0.1s;
  will-change: transform, opacity;
}
 */
.content {
  position: relative;
  height: 100%;
  -webkit-transition: -webkit-transform 1.4s, opacity 0.6s 0.3s;
          transition: transform 1.4s, opacity 0.6s 0.3s;
  will-change: transform, opacity;
}
.content.inactive {
  opacity: 0;
  -webkit-transform: scale(0.9);
      -ms-transform: scale(0.9);
          transform: scale(0.9);
}

/* 
.back,
.front {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-transition: -webkit-transform 0.5s 0.5s;
          transition: transform 0.5s 0.5s;
  will-change: transform;
}
 */
.back,
.front {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-transition: -webkit-transform 1.3s 1.3s;
          transition: transform 1.3s 1.3s;
  will-change: transform;
}
/* 
.back__bg,
.front__bg {
  position: absolute;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  -webkit-transition: -webkit-transform 0.5s;
          transition: transform 0.5s;
  will-change: transform;
}
 */
.back__bg,
.front__bg {
  position: absolute;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  -webkit-transition: -webkit-transform 1.3s;
          transition: transform 1.3s;
  will-change: transform;
}
.back__bg-1,
.front__bg-1 {
  background-image: url(../images/001_rus_2015.jpg);
}
.back__bg-2,
.front__bg-2 {
  background-image: url(../images/002_rus_2015.jpg);
}
.back__bg-3,
.front__bg-3 {
  background-image: url(../images/003_rus_2015.jpg);
}
.back__bg-4,
.front__bg-4 {
  background-image: url(../images/004_rus_2015.jpg);
}
.back__bg-5,
.front__bg-5 {
  background-image: url(../images/005_rus_2015.jpg);
}
.back__bg-6,
.front__bg-6 {
  background-image: url(../images/006_rus_2015.jpg);
}
.back__bg-7,
.front__bg-7 {
  background-image: url(../images/007_rus_2015.jpg);
}
.back__bg-8,
.front__bg-8 {
  background-image: url(../images/008_rus_2015.jpg);
}
.back__bg-9,
.front__bg-9 {
  background-image: url(../images/009_rus_2015.jpg);
}
.back__bg-10,
.front__bg-10 {
  background-image: url(../images/010_rus_2015.jpg);
}
.back__bg-11,
.front__bg-11 {
  background-image: url(../images/011_rus_2015.jpg);
}
.back__bg-12,
.front__bg-12 {
  background-image: url(../images/012_rus_2015.jpg);
}
.back__bg-13,
.front__bg-13 {
  background-image: url(../images/013_rus_2015.jpg);
}
.back__bg-14,
.front__bg-14 {
  background-image: url(../images/014_rus_2015.jpg);
}
.back__bg-15,
.front__bg-15 {
  background-image: url(../images/015_rus_2015.jpg);
}
.back__bg-16,
.front__bg-16 {
  background-image: url(../images/016_rus_2015.jpg);
}
.back__bg-17,
.front__bg-17 {
  background-image: url(../images/017_rus_2015.jpg);
}
.back__bg-18,
.front__bg-18 {
  background-image: url(../images/018_rus_2015.jpg);
}
.back__bg-19,
.front__bg-19 {
  background-image: url(../images/019_rus_2015.jpg);
}
.back__bg-20,
.front__bg-20 {
  background-image: url(../images/020_rus_2015.jpg);
}
.back__bg-21,
.front__bg-21 {
  background-image: url(../images/021_rus_2015.jpg);
}
.back__bg-22,
.front__bg-22 {
  background-image: url(../images/022_rus_2015.jpg);
}
.back__bg-23,
.front__bg-23 {
  background-image: url(../images/023_rus_2015.jpg);
}
.back__bg-24,
.front__bg-24 {
  background-image: url(../images/024_rus_2015.jpg);
}
.back__bg-25,
.front__bg-25 {
  background-image: url(../images/025_rus_2015.jpg);
}
.back__bg-26,
.front__bg-26 {
  background-image: url(../images/026_rus_2015.jpg);
}
.back__bg-27,
.front__bg-27 {
  background-image: url(../images/027_rus_2015.jpg);
}
.back__bg-28,
.front__bg-28 {
  background-image: url(../images/028_rus_2015.jpg);
}
.back__bg-29,
.front__bg-29 {
  background-image: url(../images/029_rus_2015.jpg);
}

.back__bg.hidden {
  display: none;
}
.back__bg:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
}
.back__bg-1 {
  top: 0%;
}
.back__bg-2 {
  top: 100%;
}
.back__bg-3 {
  top: 200%;
}
.back__bg-4 {
  top: 300%;
}
.back__bg-5 {
  top: 400%;
}
.back__bg-6 {
  top: 500%;
}
.back__bg-7 {
  top: 600%;
}
.back__bg-8 {
  top: 700%;
}
.back__bg-9 {
  top: 800%;
}
.back__bg-10 {
  top: 900%;
}
.back__bg-11 {
  top: 1000%;
}
.back__bg-12 {
  top: 1100%;
}
.back__bg-13 {
  top: 1200%;
}
.back__bg-14 {
  top: 1300%;
}
.back__bg-15 {
  top: 1400%;
}
.back__bg-16 {
  top: 1500%;
}
.back__bg-17 {
  top: 1600%;
}
.back__bg-18 {
  top: 1700%;
}
.back__bg-19 {
  top: 1800%;
}
.back__bg-20 {
  top: 1900%;
}
.back__bg-21 {
  top: 2000%;
}
.back__bg-22 {
  top: 2100%;
}
.back__bg-23 {
  top: 2200%;
}
.back__bg-24 {
  top: 2300%;
}
.back__bg-25 {
  top: 2400%;
}
.back__bg-26 {
  top: 2500%;
}
.back__bg-27 {
  top: 2600%;
}
.back__bg-28 {
  top: 2700%;
}
.back__bg-29 {
  top: 2800%;
}

.front__bg {
  -webkit-transform: scale(0.8);
      -ms-transform: scale(0.8);
          transform: scale(0.8);
}
.front__bg.active {
  -webkit-transform: scale(1);
      -ms-transform: scale(1);
          transform: scale(1);
}
.front__bg:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.25);
}
.front__bg-0 {
  top: 100%;
}
.front__bg-1 {
  top: 0%;
}
.front__bg-2 {
  top: -100%;
}
.front__bg-3 {
  top: -200%;
}
.front__bg-4 {
  top: -300%;
}
.front__bg-5 {
  top: -400%;
}
.front__bg-6 {
  top: -500%;
}
.front__bg-7 {
  top: -600%;
}
.front__bg-8 {
  top: -700%;
}
.front__bg-9 {
  top: -800%;
}
.front__bg-10 {
  top: -900%;
}
.front__bg-11 {
  top: -1000%;
}
.front__bg-12 {
  top: -1100%;
}
.front__bg-13 {
  top: -1200%;
}
.front__bg-14 {
  top: -1300%;
}
.front__bg-15 {
  top: -1400%;
}
.front__bg-16 {
  top: -1500%;
}
.front__bg-17 {
  top: -1600%;
}
.front__bg-18 {
  top: -1700%;
}
.front__bg-19 {
  top: -1800%;
}
.front__bg-20 {
  top: -1900%;
}
.front__bg-21 {
  top: -2000%;
}
.front__bg-22 {
  top: -2100%;
}
.front__bg-23 {
  top: -2200%;
}
.front__bg-24 {
  top: -2300%;
}
.front__bg-25 {
  top: -2400%;
}
.front__bg-26 {
  top: -2500%;
}
.front__bg-27 {
  top: -2600%;
}
.front__bg-28 {
  top: -2700%;
}
.front__bg-29 {
  top: -2800%;
}

/* Text-Navigation mit Nummerierung und Beschriftung der Bilder */
.nav {
  position: absolute;
  left: 0;
  bottom: 20%;
  width: 100%;
  text-align: center;
}
.nav__el {
  display: inline-block;
  position: relative;
  font-size: 2.0rem;
  height: 3.0rem;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.0);
  font-family: "Open Sans", Helvetica, Arial, sans-serif;
  margin: 1rem 2rem;
  padding-left: 1.5rem;
  cursor: pointer;
  overflow: hidden;
}
.nav__el-clone {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  -webkit-transition: -webkit-transform 0.5s;
          transition: transform 0.5s;
  will-change: transform;
  -webkit-transform: translateX(-100%);
      -ms-transform: translateX(-100%);
          transform: translateX(-100%);
}
.nav__el-clone > div {
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
  -webkit-transition: -webkit-transform 0.5s;
          transition: transform 0.5s;
  will-change: transform;
  -webkit-transform: translateX(100%);
      -ms-transform: translateX(100%);
          transform: translateX(100%);
}
.nav__el.active:after {
  -webkit-transform: scale(1);
      -ms-transform: scale(1);
          transform: scale(1);
}
.nav__el.active .nav__el-clone {
  -webkit-transform: scale(1);
      -ms-transform: scale(1);
          transform: scale(1);
  -webkit-transition: -webkit-transform 6s 2s;
          transition: transform 6s 2s;
}
.nav__el.active .nav__el-clone .nav__el {
  -webkit-transform: scale(1);
      -ms-transform: scale(1);
          transform: scale(1);
  -webkit-transition: -webkit-transform 6s 2s;
          transition: transform 6s 2s;
}
.nav__el:before {
  position: absolute;
  top: 50%;
  margin-top: -1rem;
  left: -0.3rem;
  font-size: 1.5rem;
  -webkit-transform: rotate(-90deg);
      -ms-transform: rotate(-90deg);
          transform: rotate(-90deg);
}
.nav__el:after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: rgba(255, 255, 255, 0.75);
  -webkit-transition: -webkit-transform 1.5s;
          transition: transform 1.5s;
  -webkit-transform: scale(0);
      -ms-transform: scale(0);
          transform: scale(0);
}
/* Vergabe der um 90 Grad gedrehten Bildnummern */
.nav__el-1:before {
  content: "01";
}
.nav__el-2:before {
  content: "02";
}
.nav__el-3:before {
  content: "03";
}
.nav__el-4:before {
  content: "04";
}
.nav__el-5:before {
  content: "05";
}
.nav__el-6:before {
  content: "06";
}
.nav__el-7:before {
  content: "07";
}
.nav__el-8:before {
  content: "08";
}
.nav__el-9:before {
  content: "09";
}
.nav__el-10:before {
  content: "10";
}
.nav__el-11:before {
  content: "11";
}
.nav__el-12:before {
  content: "12";
}
.nav__el-13:before {
  content: "13";
}
.nav__el-14:before {
  content: "14";
}
.nav__el-15:before {
  content: "15";
}
.nav__el-16:before {
  content: "16";
}
.nav__el-17:before {
  content: "17";
}
.nav__el-18:before {
  content: "18";
}
.nav__el-19:before {
  content: "19";
}
.nav__el-20:before {
  content: "20";
}
.nav__el-21:before {
  content: "21";
}
.nav__el-22:before {
  content: "22";
}
.nav__el-23:before {
  content: "23";
}
.nav__el-24:before {
  content: "24";
}
.nav__el-25:before {
  content: "25";
}
.nav__el-26:before {
  content: "26";
}
.nav__el-27:before {
  content: "27";
}
.nav__el-28:before {
  content: "28";
}
.nav__el-29:before {
  content: "29";
}

/* Menü-Button oben rechts: faltet sich über fast die gesamte Bildschirmfläche aus */
/* z-index muss auf n(Bilder)+1 eingestellt sein, damit er auf jeden Fall im Vordergrund erscheint */
.menu__btn {
  z-index: 30;
  position: absolute;
  top: 5%;
  right: 5%;
  width: 5.2rem;
  height: 5.2rem;
  border: 2px solid;
  color: #fff;
  overflow: hidden;
  cursor: pointer;
  -webkit-transition: background-color 0.5s;
          transition: background-color 0.5s;
}
.menu__btn:hover:after {
  -webkit-transform: scale(1);
      -ms-transform: scale(1);
          transform: scale(1);
}
.menu__btn:hover .menu__btn-line:nth-child(1) {
  -webkit-animation: animateMenuBtn 0.7s 0s;
          animation: animateMenuBtn 0.7s 0s;
}
.menu__btn:hover .menu__btn-line:nth-child(2) {
  -webkit-animation: animateMenuBtn 0.7s 0.2s;
          animation: animateMenuBtn 0.7s 0.2s;
}
.menu__btn:hover .menu__btn-line:nth-child(3) {
  -webkit-animation: animateMenuBtn 0.7s 0.4s;
          animation: animateMenuBtn 0.7s 0.4s;
}
.menu__btn:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0.5rem solid #fff;
  -webkit-transition: -webkit-transform 0.6s;
          transition: transform 0.6s;
  will-change: transform;
  -webkit-transform: scale(1.5);
      -ms-transform: scale(1.5);
          transform: scale(1.5);
}
.menu__btn-inner {
  position: absolute;
  top: 1.6rem;
  left: 1.2rem;
  width: 2.4rem;
  height: 1.6rem;
  overflow: hidden;
}
.menu__btn-line {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: #fff;
}
.menu__btn-line:nth-child(1) {
  top: 0;
}
.menu__btn-line:nth-child(2) {
  top: 0.7rem;
}
.menu__btn-line:nth-child(3) {
  top: 1.4rem;
}
.menu__block {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
  text-align: center;
}
.menu__block.visible {
  display: block;
}
.menu__block-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-image: url(../images/030_rus_2015.jpg);
}
.menu__block-svg {
  overflow: visible;
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.menu__block-svgPath {
  fill: rgba(255,255,255, 0.5);
}
.menu__heading {
  position: absolute;
  max-width: 100rem;
  top: 20%;
  left: 50%;
  -webkit-transform: translateX(-50%) translateY(-50%);
      -ms-transform: translateX(-50%) translateY(-50%);
          transform: translateX(-50%) translateY(-50%);
  font-family: "Open Sans", Helvetica, Arial, sans-serif;
  font-size: 2rem;
  color: rgba(0, 0, 0, 0.5);
  text-transform: uppercase;
  opacity: 0;
  -webkit-transition: opacity 0.3s;
          transition: opacity 0.3s;
  text-align: center;
}

@-webkit-keyframes animateMenuBtn {
  49.9% {
    -webkit-transform: translateX(100%);
            transform: translateX(100%);
  }
  50% {
    -webkit-transform: translateX(-100%);
            transform: translateX(-100%);
  }
  100% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
}

@keyframes animateMenuBtn {
  49.9% {
    -webkit-transform: translateX(100%);
            transform: translateX(100%);
  }
  50% {
    -webkit-transform: translateX(-100%);
            transform: translateX(-100%);
  }
  100% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
}