/*! normalize.css v3.0.3 | MIT License | git.io/normalize */
/**
 * 1. Set default font family to sans-serif.
 * 2. Prevent iOS text size adjust after orientation change, without disabling
 *    user zoom.
 */

html {
    font-family: sans-serif;
    /* 1 */

    -ms-text-size-adjust: 100%;
    /* 2 */

    -webkit-text-size-adjust: 100%;
    /* 2 */
}
/**
 * Remove default margin.
 */

body {
    margin: 0;
}
/* HTML5 display definitions
   ========================================================================== */
/**
 * Correct `block` display not defined for any HTML5 element in IE 8/9.
 * Correct `block` display not defined for `details` or `summary` in IE 10/11
 * and Firefox.
 * Correct `block` display not defined for `main` in IE 11.
 */

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
menu,
nav,
section,
summary {
    display: block;
}
/**
 * 1. Correct `inline-block` display not defined in IE 8/9.
 * 2. Normalize vertical alignment of `progress` in Chrome, Firefox, and Opera.
 */

audio,
canvas,
progress,
video {
    display: inline-block;
    /* 1 */

    vertical-align: baseline;
    /* 2 */
}
/**
 * Prevent modern browsers from displaying `audio` without controls.
 * Remove excess height in iOS 5 devices.
 */

audio:not([controls]) {
    display: none;
    height: 0;
}
/**
 * Address `[hidden]` styling not present in IE 8/9/10.
 * Hide the `template` element in IE 8/9/11, Safari, and Firefox < 22.
 */

[hidden],
template {
    display: none;
}
/* Links
   ========================================================================== */
/**
 * Remove the gray background color from active links in IE 10.
 */

a {
    background-color: transparent;
}
/**
 * Improve readability when focused and also mouse hovered in all browsers.
 */

a:active,
a:hover {
    outline: 0;
}
/* Text-level semantics
   ========================================================================== */
/**
 * Address styling not present in IE 8/9/10/11, Safari, and Chrome.
 */

abbr[title] {
    border-bottom: 1px dotted;
}
/**
 * Address style set to `bolder` in Firefox 4+, Safari, and Chrome.
 */

b,
strong {
    font-weight: bold;
}
/**
 * Address styling not present in Safari and Chrome.
 */

dfn {
    font-style: italic;
}
/**
 * Address variable `h1` font-size and margin within `section` and `article`
 * contexts in Firefox 4+, Safari, and Chrome.
 */

h1 {
    font-size: 2em;
    margin: 0.67em 0;
}
/**
 * Address styling not present in IE 8/9.
 */

mark {
    background: #ff0;
    color: #000;
}
/**
 * Address inconsistent and variable font size in all browsers.
 */

small {
    font-size: 80%;
}
/**
 * Prevent `sub` and `sup` affecting `line-height` in all browsers.
 */

sub,
sup {
    font-size: 75%;
    line-height: 0;
    position: relative;
    vertical-align: baseline;
}

sup {
    top: -0.5em;
}

sub {
    bottom: -0.25em;
}
/* Embedded content
   ========================================================================== */
/**
 * Remove border when inside `a` element in IE 8/9/10.
 */

img {
    border: 0;
}
/**
 * Correct overflow not hidden in IE 9/10/11.
 */

svg:not(:root) {
    overflow: hidden;
}
/* Grouping content
   ========================================================================== */
/**
 * Address margin not present in IE 8/9 and Safari.
 */

figure {
    margin: 1em 40px;
}
/**
 * Address differences between Firefox and other browsers.
 */

hr {
    -moz-box-sizing: content-box;
    box-sizing: content-box;
    height: 0;
}
/**
 * Contain overflow in all browsers.
 */

pre {
    overflow: auto;
}
/**
 * Address odd `em`-unit font size rendering in all browsers.
 */

code,
kbd,
pre,
samp {
    font-family: monospace, monospace;
    font-size: 1em;
}
/* Forms
   ========================================================================== */
/**
 * Known limitation: by default, Chrome and Safari on OS X allow very limited
 * styling of `select`, unless a `border` property is set.
 */
/**
 * 1. Correct color not being inherited.
 *    Known issue: affects color of disabled elements.
 * 2. Correct font properties not being inherited.
 * 3. Address margins set differently in Firefox 4+, Safari, and Chrome.
 */

button,
input,
optgroup,
select,
textarea {
    color: inherit;
    /* 1 */

    font: inherit;
    /* 2 */

    margin: 0;
    /* 3 */
}
/**
 * Address `overflow` set to `hidden` in IE 8/9/10/11.
 */

button {
    overflow: visible;
}
/**
 * Address inconsistent `text-transform` inheritance for `button` and `select`.
 * All other form control elements do not inherit `text-transform` values.
 * Correct `button` style inheritance in Firefox, IE 8/9/10/11, and Opera.
 * Correct `select` style inheritance in Firefox.
 */

button,
select {
    text-transform: none;
}
/**
 * 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
 *    and `video` controls.
 * 2. Correct inability to style clickable `input` types in iOS.
 * 3. Improve usability and consistency of cursor style between image-type
 *    `input` and others.
 */

button,
html input[type="button"],
/* 1 */

input[type="reset"],
input[type="submit"] {
    -webkit-appearance: button;
    /* 2 */

    cursor: pointer;
    /* 3 */
}
/**
 * Re-set default cursor for disabled elements.
 */

button[disabled],
html input[disabled] {
    cursor: default;
}
/**
 * Remove inner padding and border in Firefox 4+.
 */

button::-moz-focus-inner,
input::-moz-focus-inner {
    border: 0;
    padding: 0;
}
/**
 * Address Firefox 4+ setting `line-height` on `input` using `!important` in
 * the UA stylesheet.
 */

input {
    line-height: normal;
}
/**
 * It's recommended that you don't attempt to style these elements.
 * Firefox's implementation doesn't respect box-sizing, padding, or width.
 *
 * 1. Address box sizing set to `content-box` in IE 8/9/10.
 * 2. Remove excess padding in IE 8/9/10.
 */

input[type="checkbox"],
input[type="radio"] {
    box-sizing: border-box;
    /* 1 */

    padding: 0;
    /* 2 */
}
/**
 * Fix the cursor style for Chrome's increment/decrement buttons. For certain
 * `font-size` values of the `input`, it causes the cursor style of the
 * decrement button to change from `default` to `text`.
 */

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    height: auto;
}
/**
 * 1. Address `appearance` set to `searchfield` in Safari and Chrome.
 * 2. Address `box-sizing` set to `border-box` in Safari and Chrome
 *    (include `-moz` to future-proof).
 */

input[type="search"] {
    -webkit-appearance: textfield;
    /* 1 */

    -moz-box-sizing: content-box;
    -webkit-box-sizing: content-box;
    /* 2 */

    box-sizing: content-box;
}
/**
 * Remove inner padding and search cancel button in Safari and Chrome on OS X.
 * Safari (but not Chrome) clips the cancel button when the search input has
 * padding (and `textfield` appearance).
 */

input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-decoration {
    -webkit-appearance: none;
}
/**
 * Define consistent border, margin, and padding.
 */

fieldset {
    border: 1px solid #c0c0c0;
    margin: 0 2px;
    padding: 0.35em 0.625em 0.75em;
}
/**
 * 1. Correct `color` not being inherited in IE 8/9/10/11.
 * 2. Remove padding so people aren't caught out if they zero out fieldsets.
 */

legend {
    border: 0;
    /* 1 */

    padding: 0;
    /* 2 */
}
/**
 * Remove default vertical scrollbar in IE 8/9/10/11.
 */

textarea {
    overflow: auto;
}
/**
 * Don't inherit the `font-weight` (applied by a rule above).
 * NOTE: the default cannot safely be changed in Chrome and Safari on OS X.
 */

optgroup {
    font-weight: bold;
}
/* Tables
   ========================================================================== */
/**
 * Remove most spacing between table cells.
 */

table {
    border-collapse: collapse;
    border-spacing: 0;
}

td,
th {
    padding: 0;
}

html,
body {
    width: 100%;
    min-height: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

html {
    max-height: 100%;
    font-size: 62.5%;
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
    background: #fff;
    font-family: 'Helvetica Neue', Helvetica, 'microsoft yahei', Arial, sans-serif;
    background: #837e7a url(../images/firmware_bg.jpg) no-repeat top right;
}

a {
    text-decoration: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    margin: 0;
    padding: 0;
}

ul,
li {
    margin: 0;
    padding: 0;
    list-style-type: none;
}

.clearfix:before,
.clearfix:after {
    content: " ";
    display: table;
}

.clearfix:after {
    clear: both;
}

.clearfix {
    *zoom: 1;
}

.hide {
    display: none !important;
}

body {
    position: relative;
}

.main {}

.w_980 {
    width: 64%;
    max-width: 64rem;
    padding: 2rem;
    margin: 3rem auto 1rem;
    background: #fff;
    border-radius: .5rem;
}

.w_980 img {
    max-width: 100%;
    height: auto;
}

.title h2 {
    font-size: 3.6rem;
    font-weight: bold;
    line-height: 3.8rem;
    letter-spacing: .5rem;
    display: block;
    text-align: center;
}

.content {
    max-width: 64rem;
    font-size: 1.6rem;
    line-height: 2.2rem;
    color: #333;
    margin: 0rem auto;
    padding: 1.5rem .5rem;
    border-bottom: 1px dashed #efefef;
}

.content h2 {
    color: #f53d00;
    display: block;
    text-align: center;
    font-size: 1.8rem;
    border-bottom: 1px dashed #efefef;
    padding-bottom: .5rem;
    line-height: 2.4rem;
}

.content h3 {
    display: block;
    text-align: center;
    font-size: 1.6rem;
    color: #666;
    margin-top: .5rem;
    margin-bottom: 1rem;
    font-weight: lighter;
}

.content h4 {
    font-size: 1.8rem;
    line-height: 2.4rem;
    margin: .5rem 0;
}

#sn_number {
    display: block;
    height: 4rem;
    width: 28rem;
    font-size: 1.6rem;
    line-height: 4rem;
    margin: 1rem auto;
    padding: 0;
    text-align: center;
    border: 1px solid #e0e0e0;
    color: #666;
    text-transform: uppercase;
}

#get_link_btn {
    display: block;
    height: 4rem;
    width: 28rem;
    font-size: 1.8rem;
    line-height: 4rem;
    background-color: #24C3F0;
    color: white;
    border-radius: .3rem;
    border: 0 none;
    margin: 1rem auto;
}

#get_link_btn:hover,
#get_link_btn:active {
    background: #136DD1;
}

#download_btn {
    display: block;
    margin: 0rem auto .5rem;
    text-align: center;
}

.download_url {
    display: block;
    text-align: center;
    font-size: 1.6rem;
    font-weight: lighter;
    line-height: 2.2rem;
    border: 1px dashed #e3e3e3;
}

.download_url h4 {
    font-size: 1.6rem;
    color: #666;
    line-height: 2.4rem;
}

.new_url {
    display: block;
    font-size: 1.4rem;
    line-height: 1.8rem;
    color: #333;
    margin: .5rem 0;
    padding: 0rem 1.5rem;
    word-wrap: break-word;
    font-weight: normal;
}

.update_memo ul {
    padding: .5rem 0;
}

.update_memo ul li {
    display: block;
    line-height: 2.4rem;
}

.sn_field {
    border-bottom: 1px dashed #efefef;
    padding: 1rem .5rem;
}

.a_link {
    margin-top: 3rem;
}

.help {
    padding: .5rem;
    color: #595959
}

.help p {
    font-size: 1.6rem;
    margin: .5rem 0;
    line-height: 2.2rem;
}

.help p a {
    margin: 0 .5rem;
    display: inline-block;
    padding: .2rem .5rem;
    color: #fff;
    background: #37CC35;
    border-radius: .3rem
}

.help p a:hover,
.help p a:active {
    background: #0054CF
}
/*固件升级教程*/

.firmware_guide h2 {
    display: block;
    text-align: center;
    font-size: 3.2rem;
    font-weight: bold;
}

.copyright {
    display: block;
    font-size: 1.4rem;
    margin: 1rem auto;
    text-align: center;
    color: #fff;
    height: 2rem;
    line-height: 2rem;
    text-align: center;
}

.btn-back-update{
  display: block;
  max-width: 20rem;
  margin:0 auto;
  font-size: 1.8rem;
  line-height: 4rem;
  color:#fff;
  border-radius: .3rem;
  width: 80%;
  height: 4rem;
  background: #E72519;
}

@media only screen and (max-width: 421px) {
    .w_980 {
        width: 80%;
    }
    .title h2 {
        font-size: 2.4rem;
        line-height: 2.8rem
    }
}