:root {
  --main-bg-color: #e9e8e8;
  --btn-bg-color: #fefefe;
  --btn-fnt-color: #2e2f33;
  --btn-border: #e8e8e8;
  --hover-color: #276efa;
  --secondary-gray: #747577;

  --btn-hover-bg-color: #f5f5f5;

  --success-color: #155724;
  --success-bg-color: #d4edda;
  --success-brdr: #d6e9c6;

  --info-color: #31708f;
  --info-bg-color: #d9edf7;
  --info-brdr: #bce8f1;

  --error-color: #a94442;
  --error-bg-color: #f2dede;
  --error-brdr: #ebccd1;
}

.hidden {
  display: none;
}

.file-selector {
  height: 0;
  overflow: hidden;
  width: 0;
}

.file-selector + label {
  padding: 1em;
  border-radius: 5px;
  display: grid;
  place-items: center;

  width: 100%;
  height: 100%;
}

.file-selector + label:hover {
  cursor: pointer;
}

#file-transfer-status {
  text-align: center;
  border-radius: 5px;
  border: 1px solid transparent;
  padding: 5px;
}

#file-transfer-status.success {
  background-color: var(--success-bg-color);
  color: var(--success-color);
  border-color: var(--success-brdr);
}

#file-transfer-status.error {
  background-color: var(--error-bg-color);
  color: var(--error-color);
  border-color: var(--error-brdr);
}

#file-transfer-status.info {
  background-color: var(--info-bg-color);
  color: var(--info-color);
  border-color: var(--info-brdr);
}

html {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

button.btn {
  background-color: var(--btn-bg-color);
  border: 1px solid var(--btn-border);
  border-radius: 5px;
  color: var(--btn-fnt-color);
  padding: 10px;
  font-size: 16px;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);

  transition: all 0.2s ease-in-out;
}

button.btn:disabled {
  background-color: #f5f5f5;
  color: #bdbdbd;
  cursor: not-allowed;
}

button.btn:hover:not([disabled]) {
  color: var(--btn-fnt-color);
  background-color: var(--btn-hover-bg-color);
}

button.btn:disabled:hover {
  background-color: #f5f5f5;
  color: #bdbdbd;
  cursor: not-allowed;
  border-color: none;
}

body {
  font-family: "Open Sans", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: #333;
  background-color: var(--main-bg-color);
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.main {
  width: 100%;
  max-width: 600px;
  padding: 1em;
  display: flex;
  flex-direction: column;
}

.upload-container {
  display: flex;
  flex-direction: column;
  padding: 1em;
  background-color: #fff;
  border-radius: 5px;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
  margin: 1em 0;
}

.upload-text {
  text-align: center;
}

.upload-area {
  border: 2px dashed #c3c3c3;
  border-radius: 5px;
  margin-bottom: 1em;
  transition: all 0.2s ease-in-out;

  display: grid;
  place-items: center;
}

.upload-area:hover {
  cursor: pointer;
  border-color: var(--hover-color);
  color: var(--hover-color) !important;
}

.pair {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
}

.pair .icon {
  background-color: #fff;
  border-radius: 50%;
  padding: 1em;
  display: grid;
  place-items: center;
}

.ws-connection {
  visibility: hidden;
}

#me {
  color: var(--secondary-gray);
}

small {
  color: var(--secondary-gray);
}

#preview {
  width: 100px;
  margin: 1em;
}

.highlight {
  border-color: var(--hover-color);
  color: var(--hover-color) !important;
}

.loading-container {
  display: grid;
  place-items: center;
}

.loading {
  position: relative;
  width: 80px;
  height: 80px;
}
.loading div {
  position: absolute;
  border: 4px solid #fff;
  opacity: 1;
  border-radius: 50%;
  animation: loading 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}
.loading div:nth-child(2) {
  animation-delay: -0.5s;
}

.download-area {
  display: none;
  place-items: center;

  margin-bottom: 1em;
}

#download-button {
  display: none;
  background-color: #198754;
  border-color: #146c43;
  color: #fff;
}

#download-button:hover {
  background-color: #146c43;
  border-color: #3d8b67;
}

span#filename {
  color: var(--secondary-gray);
  font-weight: lighter;
  text-align: center;
}

@keyframes loading {
  0% {
    top: 36px;
    left: 36px;
    width: 0;
    height: 0;
    opacity: 0;
  }
  4.9% {
    top: 36px;
    left: 36px;
    width: 0;
    height: 0;
    opacity: 0;
  }
  5% {
    top: 36px;
    left: 36px;
    width: 0;
    height: 0;
    opacity: 1;
  }
  100% {
    top: 0px;
    left: 0px;
    width: 72px;
    height: 72px;
    opacity: 0;
  }
}