/* reset.css - 重置浏览器默认样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.5;
    color: #333;
    background-color: #fff;
}

article, aside, details, figcaption, figure, 
footer, header, hgroup, main, menu, nav, section {
    display: block;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
}

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

a {
    color: inherit;
    text-decoration: none;
    background-color: transparent;
}

a:hover {
    text-decoration: none;
}

img {
    border-style: none;
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

button, input, optgroup, select, textarea {
    font-family: inherit;
    font-size: 100%;
    line-height: 1.15;
    margin: 0;
}

button, input {
    overflow: visible;
}

button, select {
    text-transform: none;
}

button, [type="button"], [type="reset"], [type="submit"] {
    -webkit-appearance: button;
    appearance: button;
}

button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
    border-style: none;
    padding: 0;
}

button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
    outline: 1px dotted ButtonText;
}

textarea {
    overflow: auto;
}

[type="checkbox"],
[type="radio"] {
    box-sizing: border-box;
    padding: 0;
}

[type="search"] {
    -webkit-appearance: textfield;
    appearance: textfield;
    outline-offset: -2px;
}

[type="search"]::-webkit-search-decoration {
    -webkit-appearance: none;
}

::-webkit-file-upload-button {
    -webkit-appearance: button;
    font: inherit;
}

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

hr {
    box-sizing: content-box;
    height: 0;
    overflow: visible;
}

pre {
    font-family: monospace, monospace;
    font-size: 1em;
}

b, strong {
    font-weight: bolder;
}

code, kbd, samp {
    font-family: monospace, monospace;
    font-size: 1em;
}

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;
}

/* 移除iOS输入框内阴影 */
input, textarea {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

/* 移除数字输入框的上下箭头 */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* 修复IE11的隐藏滚动条问题 */
textarea {
    overflow: auto;
}

/* 修复Chrome自动填充背景色 */
input:-webkit-autofill,
input:-webkit-autofill:hover, 
input:-webkit-autofill:focus,
textarea:-webkit-autofill,
textarea:-webkit-autofill:hover,
textarea:-webkit-autofill:focus,
select:-webkit-autofill,
select:-webkit-autofill:hover,
select:-webkit-autofill:focus {
    -webkit-box-shadow: 0 0 0px 1000px white inset !important;
    box-shadow: 0 0 0px 1000px white inset !important;
}

/* 隐藏视觉上但保留屏幕阅读器可访问 */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* 清除浮动 */
.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

/* 打印样式 */
@media print {
    *,
    *::before,
    *::after {
        text-shadow: none !important;
        box-shadow: none !important;
    }
    
    a:not(.btn) {
        text-decoration: underline;
    }
    
    abbr[title]::after {
        content: " (" attr(title) ")";
    }
    
    pre {
        white-space: pre-wrap !important;
    }
    
    pre,
    blockquote {
        border: 1px solid #999;
        page-break-inside: avoid;
    }
    
    thead {
        display: table-header-group;
    }
    
    tr,
    img {
        page-break-inside: avoid;
    }
    
    p,
    h2,
    h3 {
        orphans: 3;
        widows: 3;
    }
    
    h2,
    h3 {
        page-break-after: avoid;
    }
}