html {
  font-size: 100%;
  line-height: 1.5em;
  font-family: sans-serif;
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}
button {
  overflow: visible;
  outline: none;
}
button,
select {
  text-transform: none;
}
[type="reset"],
[type="submit"],
button,
html [type="button"] {
  -webkit-appearance: button;
}
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner,
button::-moz-focus-inner {
  border-style: none;
  padding: 0;
}
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring,
button:-moz-focusring {
  outline: 1px dotted ButtonText;
}
body {
  margin: 0;
}
article,
aside,
details,
figcaption,
figure,
footer,
header,
main,
menu,
nav,
section,
summary {
  display: block;
}
audio,
canvas,
progress,
video {
  display: inline-block;
  *display: inline;
  *zoom: 1;
}
audio:not([controls]) {
  display: none;
  height: 0;
}
progress {
  vertical-align: baseline;
}
[hidden],
template {
  display: none;
}
a {
  background-color: transparent;
  -webkit-text-decoration-skip: objects;
  color: inherit;
  cursor: pointer;
  text-decoration: none;
}
a:active,
a:hover {
  outline-width: 0;
  text-decoration: none;
}
abbr[title] {
  border-bottom: none;
  text-decoration: underline;
  text-decoration: underline dotted;
}
b,
strong {
  font-weight: inherit;
  font-weight: bolder;
}
code,
kbd,
pre,
samp {
  font-family: monospace, monospace;
  font-size: 1em;
}
dfn {
  font-style: italic;
}
h1 {
  font-size: 2em;
  line-height: 1.5em;
  margin-top: 0.75em;
  margin-bottom: 0.75em;
}
h2 {
  font-size: 1.5em;
  line-height: 2em;
  margin-top: 1em;
  margin-bottom: 1em;
}
h3 {
  font-size: 1.17em;
  line-height: 1.28205em;
  margin-top: 1.28205em;
  margin-bottom: 1.28205em;
}
h4 {
  font-size: 1em;
  line-height: 1.5em;
  margin-top: 1.5em;
  margin-bottom: 1.5em;
}
h5 {
  font-size: 0.83em;
  line-height: 1.80723em;
  margin-top: 1.80723em;
  margin-bottom: 1.80723em;
}
h6 {
  font-size: 0.67em;
  line-height: 2.23881em;
  margin-top: 2.23881em;
  margin-bottom: 2.23881em;
}
mark {
  background-color: #ff0;
  color: #000;
}
small {
  font-size: 80%;
}
sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}
sub {
  bottom: -0.25em;
}
sup {
  top: -0.5em;
}
img {
  border-style: none;
  -ms-interpolation-mode: bicubic;
}
svg:not(:root) {
  overflow: hidden;
}
blockquote {
  margin: 1.5em 40px;
}
dl,
menu,
ol,
ul {
  margin: 1.5em 0;
}
dd {
  margin: 0 0 0 40px;
}
menu,
ol,
ul {
  padding: 0 0 0 40px;
}
nav ol,
nav ul {
  list-style: none;
  list-style-image: none;
}
figure {
  margin: 1.5em 40px;
}
hr {
  box-sizing: content-box;
  height: 0;
  overflow: visible;
}
p,
pre {
  margin: 1.5em 0;
}
form {
  margin: 0;
}
button,
input,
optgroup,
select,
textarea {
  font: inherit;
  margin: 0;
  *font-family: sans-serif;
  *vertical-align: middle;
}
button {
  overflow: visible;
}
button,
select {
  text-transform: none;
}
[type="reset"],
[type="submit"],
button,
html [type="button"] {
  -webkit-appearance: button;
}
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner,
button::-moz-focus-inner {
  border-style: none;
  padding: 0;
}
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring,
button:-moz-focusring {
  outline: 1px dotted ButtonText;
}
input {
  overflow: visible;
  line-height: normal;
}
[type="checkbox"],
[type="radio"] {
  box-sizing: border-box;
  padding: 0;
  *height: 13px;
  *width: 13px;
}
[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
  height: auto;
}
[type="search"] {
  -webkit-appearance: textfield;
  outline-offset: -2px;
}
[type="search"]::-webkit-search-cancel-button,
[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none;
}
::-webkit-input-placeholder {
  color: inherit;
  opacity: 0.54;
}
::-webkit-file-upload-button {
  -webkit-appearance: button;
  font: inherit;
}
fieldset {
  margin: 0 2px;
  border-color: silver;
  border-top-width: 0.0625em;
  border-bottom-width: 0.0625em;
  border-left-width: 0.0625em;
  border: solid;
  padding: 0.4625em 0.875em 0.9125em;
  border-right-width: 0.0625em;
}
legend {
  box-sizing: border-box;
  display: table;
  max-width: 100%;
  white-space: normal;
  color: inherit;
  padding: 0;
  *margin-left: -7px;
}
optgroup {
  font-weight: 700;
}
textarea {
  overflow: auto;
}

* {
  margin: 0;
  padding: 0;
}
.menu {
  font-size: 0;
  position: absolute;
  right: 10px;
  top: 10px;
  z-index: 1;
}
.menu button {
  cursor: pointer;
  background: none;
  border: none;
  height: 36px;
  margin: 0 8px;
  -webkit-transition: opacity 0.6s;
  transition: opacity 0.6s;
  opacity: 0.7;
  padding: 0;
  width: 36px;
}
.menu button:hover {
  opacity: 1;
}
.menu .email,
.menu .wechat,
.menu .weibo {
  background-image: url("../image/sprite_share.bc0f4494.png");
  background-repeat: no-repeat;
}
.menu .wechat {
  background-size: 36px;
  background-position: 0 -26px;
}
.menu .weibo {
  background-size: 36px;
  background-position: 0 -63px;
}
.menu .email {
  background-size: 54px;
  background-position: 0 0;
}
.download {
  padding: 60px 0;
  text-align: center;
}

.download .txt {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 6.125px;
}

@media screen and (max-width: 576px) {
  .download .txt {
    letter-spacing: 3px;
  }
}

.download img {
  margin-top: 30px;
  height: 180px;
  width: 180px;
}

.footer {
  background: #444;
  font-size: 12px;
  padding: 55px 10px;
}
.footer .link-list {
  color: #fff;
  font-size: 0;
  /* margin: 0 0 10px; */
  padding: 0;
  line-height: 2.3;
  text-align: center;
}
.footer .link-list li {
  display: inline-block;
}
@media screen and (max-width: 576px) {
  .footer .nav {
    margin-bottom: 10px;
  }
}

.footer .copyright {
  color: #aaa;
  text-align: center;
}
.footer,
.footer a,
.footer span {
  font-size: 12px;
  color: #fff;
}

.an {
  position: relative;
  top: 5px;
  margin-right: 5px;
}
.footer .nav {
  /* margin-bottom: 10px; */
}
@media screen and (max-width: 576px) {
  /* .footer .nav li {
    margin: 0 10px;
  } */
  .footer p {
    text-align: center;
  }
}
.rich_text {
  width: 768px;
  margin: 0 auto;
}
.rich_text * {
  font-size: 14px;
  letter-spacing: 2px;
  color: #888;
  line-height: 25px;
  text-align: center;
  max-width: 100%;
}

@media screen and (max-width: 768px) {
  .rich_text {
    width: 80%;
    margin: 0 auto;
  }
}
.l_mask {
  display: none;
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: 2;
}
.l_mask .mask {
  position: fixed;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.3);
  z-index: 2;
}
.l_mask .content {
  background-color: #fff;
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 3;
  padding: 20px 20px 0 20px;
  border-radius: 8px;
}
.l_mask .content img {
  display: block;
}
.l_mask .content .txt {
  padding: 10px 0 20px 0;
  text-align: center;
  font-size: 13px;
}
.mask_hide {
  animation: hide 1s;
}
.mask_in {
  animation: in 1s;
}

.mask_out {
  animation: out 0.8s;
}
@keyframes show {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
    display: block;
  }
}
@keyframes hide {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    display: none;
  }
}

@keyframes in {
  0% {
    opacity: 0;
    transform: translate(-50%, -70%);
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}

@keyframes out {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -30%);
  }
}
@media screen and (max-width: 576px) {
  .footer .link-list {
    line-height: 1.5;
  }
}

.video-list .video .title {
  font-size: 16px;
  font-weight: 700;
}
.video-list .video .meta {
  font-size: 13px;
  line-height: 19px;
  height: 19px;
  margin-top: 10px;
}
/* 12-15 */
.box {
  height: 100%;
}
.top-screen .content .logo1 {
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translateX(-50%);
}
.top-screen .content .logo1 img {
  width: 310px;
}

@media screen and (max-width: 576px) {
  .top-screen .content .logo1 img {
    width: 210px;
  }
}

.top-screen .content .txt-y img {
  width: 350px;
  position: absolute;
  top: 54%;
  left: 50%;
  transform: translateX(-50%);
}

@media screen and (max-width: 576px) {
  .top-screen .content .txt-y img {
    width: 280px;
  }
}
.top-screen .content .txt {
  font-size: 20px;
  letter-spacing: 6px;
  margin-top: 20px;
  opacity: 0.7;
}

.smallBox {
  position: absolute;
  top: 67%;
  left: 50%;
  transform: translateX(-50%);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 3px;
  cursor: pointer;
}
.smallBox .smallBoxBox {
  background-color: rgba(255, 255, 255, 0.3);
  display: flex;
  align-items: center;
  padding: 10px 10px;
  color: #fff;
  font-size: 15px;
  letter-spacing: 2px;
  opacity: 0.8;
}

.smallBox .smallBoxBox img {
  width: 26px;
  height: 26px;
  margin-right: 15px;
}
.download {
  text-align: center;
}

@media screen and (max-width: 576px) {
  .download .txt {
    font-size: 15px;
  }
}
.download .smallBox {
  position: static;
  border: 1px solid rgba(0, 0, 0);
  padding: 3px;
  display: inline-block;
  cursor: pointer;
  margin: 50px auto 0;
  transform: none;
}
.download .smallBoxBox {
  background-color: rgba(0, 0, 0);
}
.smallBox .smallBoxBox img {
  margin: 0;
  margin-right: 15px;
}
.l_mask .content > img {
  width: 270px;
  height: 270px;
}