@import url('/styles/site-tokens.css?v=20261021theme1');
@import url('/assets/tutorials/baa2740a6b8eda-font-awesome.min.css');

.browser-support-icons {
    display: flex;
    float: right;
    justify-content: flex-end;
    align-items: center;
    gap: 7px;
    margin: 25px 0 14px 12px;
    font-size: 20px;
    line-height: 1;
    white-space: nowrap
}

.browser-support-icons .fa {
    position: relative;
    display: inline-block;
    width: 1.2em;
    height: 1.2em;
    line-height: 1.2em;
    text-align: center;
    vertical-align: middle
}

.browser-support-icons .fa-internet-explorer { color: #0078d7 }
.browser-support-icons .fa-firefox { color: #e66000 }
.browser-support-icons .fa-chrome { color: #4285f4 }
.browser-support-icons .fa-safari { color: #1684d6 }
.browser-support-icons .fa-opera { color: #e11b22 }

.browser-support-icons .is-incompatible::after {
    position: absolute;
    top: -2px;
    right: -3px;
    border: 1px solid #fff;
    border-radius: 50%;
    background: #fff;
    color: #c62828;
    content: "\f00d";
    font: 9px/1 FontAwesome
}

table.browsersupport .bsIE, table.browserref .bsIE,
table.browsersupport .bsFirefox, table.browserref .bsFirefox,
table.browsersupport .bsChrome, table.browserref .bsChrome,
table.browsersupport .bsSafari, table.browserref .bsSafari,
table.browsersupport .bsOpera, table.browserref .bsOpera,
table.browserref .bsEdge,
table.browsersupport .bsNoIE, table.browserref .bsNoIE,
table.browsersupport .bsNoFirefox, table.browserref .bsNoFirefox,
table.browsersupport .bsNoChrome, table.browserref .bsNoChrome,
table.browsersupport .bsNoSafari, table.browserref .bsNoSafari,
table.browsersupport .bsNoOpera, table.browserref .bsNoOpera,
table.browsersupport .bsPreIE, table.browserref .bsPreIE,
table.browsersupport .bsPreFirefox, table.browserref .bsPreFirefox,
table.browsersupport .bsPreChrome, table.browserref .bsPreChrome,
table.browsersupport .bsPreSafari, table.browserref .bsPreSafari,
table.browsersupport .bsPreOpera, table.browserref .bsPreOpera,
table.browserref .bsPreXVOpera,
table.bsReference [class*="bs"] {
    background-image: none
}

table.browsersupport td[class*="bs"], table.browsersupport th[class*="bs"],
table.browserref td[class*="bs"], table.browserref th[class*="bs"],
table.bsReference td[class*="bs"], table.bsReference th[class*="bs"] {
    position: relative
}

table.browsersupport .bsIE::before, table.browsersupport .bsNoIE::before, table.browsersupport .bsPreIE::before,
table.browserref .bsIE::before, table.browserref .bsNoIE::before, table.browserref .bsPreIE::before,
table.bsReference .bsIE::before, table.bsReference .bsNoIE::before, table.bsReference .bsPreIE::before { content: "\f26b" }
table.browsersupport .bsFirefox::before, table.browsersupport .bsNoFirefox::before, table.browsersupport .bsPreFirefox::before,
table.browserref .bsFirefox::before, table.browserref .bsNoFirefox::before, table.browserref .bsPreFirefox::before,
table.bsReference .bsFirefox::before, table.bsReference .bsNoFirefox::before, table.bsReference .bsPreFirefox::before { content: "\f269" }
table.browsersupport .bsChrome::before, table.browsersupport .bsNoChrome::before, table.browsersupport .bsPreChrome::before,
table.browserref .bsChrome::before, table.browserref .bsNoChrome::before, table.browserref .bsPreChrome::before,
table.bsReference .bsChrome::before, table.bsReference .bsNoChrome::before, table.bsReference .bsPreChrome::before { content: "\f268" }
table.browsersupport .bsSafari::before, table.browsersupport .bsNoSafari::before, table.browsersupport .bsPreSafari::before,
table.browserref .bsSafari::before, table.browserref .bsNoSafari::before, table.browserref .bsPreSafari::before,
table.bsReference .bsSafari::before, table.bsReference .bsNoSafari::before, table.bsReference .bsPreSafari::before { content: "\f267" }
table.browsersupport .bsOpera::before, table.browsersupport .bsNoOpera::before, table.browsersupport .bsPreOpera::before,
table.browserref .bsOpera::before, table.browserref .bsNoOpera::before, table.browserref .bsPreOpera::before,
table.bsReference .bsOpera::before, table.bsReference .bsNoOpera::before, table.bsReference .bsPreOpera::before,
table.browserref .bsPreXVOpera::before, table.bsReference .bsPreXVOpera::before { content: "\f26a" }
table.browserref .bsEdge::before { content: "\f282" }

table.browsersupport td[class*="bs"]::before,
table.browsersupport th[class*="bs"]::before,
table.browserref td[class*="bs"]::before, table.browserref th[class*="bs"]::before,
table.bsReference td[class*="bs"]::before, table.bsReference th[class*="bs"]::before {
    display: inline-block;
    font: normal 18px/1 FontAwesome;
    vertical-align: middle
}

table.browsersupport .bsIE::before, table.browserref .bsIE::before, table.bsReference .bsIE::before,
table.browsersupport .bsNoIE::before, table.browserref .bsNoIE::before, table.bsReference .bsNoIE::before,
table.browsersupport .bsPreIE::before, table.browserref .bsPreIE::before, table.bsReference .bsPreIE::before { color: #0078d7 }
table.browsersupport .bsFirefox::before, table.browserref .bsFirefox::before, table.bsReference .bsFirefox::before,
table.browsersupport .bsNoFirefox::before, table.browserref .bsNoFirefox::before, table.bsReference .bsNoFirefox::before,
table.browsersupport .bsPreFirefox::before, table.browserref .bsPreFirefox::before, table.bsReference .bsPreFirefox::before { color: #e66000 }
table.browsersupport .bsChrome::before, table.browserref .bsChrome::before, table.bsReference .bsChrome::before,
table.browsersupport .bsNoChrome::before, table.browserref .bsNoChrome::before, table.bsReference .bsNoChrome::before,
table.browsersupport .bsPreChrome::before, table.browserref .bsPreChrome::before, table.bsReference .bsPreChrome::before { color: #4285f4 }
table.browsersupport .bsSafari::before, table.browserref .bsSafari::before, table.bsReference .bsSafari::before,
table.browsersupport .bsNoSafari::before, table.browserref .bsNoSafari::before, table.bsReference .bsNoSafari::before,
table.browsersupport .bsPreSafari::before, table.browserref .bsPreSafari::before, table.bsReference .bsPreSafari::before { color: #1684d6 }
table.browsersupport .bsOpera::before, table.browserref .bsOpera::before, table.bsReference .bsOpera::before,
table.browsersupport .bsNoOpera::before, table.browserref .bsNoOpera::before, table.bsReference .bsNoOpera::before,
table.browsersupport .bsPreOpera::before, table.browserref .bsPreOpera::before, table.bsReference .bsPreOpera::before,
table.browserref .bsPreXVOpera::before, table.bsReference .bsPreXVOpera::before { color: #e11b22 }
table.browserref .bsEdge::before { color: #0078d7 }

table.browsersupport .bsNoIE::after, table.browserref .bsNoIE::after, table.bsReference .bsNoIE::after,
table.browsersupport .bsNoFirefox::after, table.browserref .bsNoFirefox::after, table.bsReference .bsNoFirefox::after,
table.browsersupport .bsNoChrome::after, table.browserref .bsNoChrome::after, table.bsReference .bsNoChrome::after,
table.browsersupport .bsNoSafari::after, table.browserref .bsNoSafari::after, table.bsReference .bsNoSafari::after,
table.browsersupport .bsNoOpera::after, table.browserref .bsNoOpera::after, table.bsReference .bsNoOpera::after {
    position: absolute;
    top: 0;
    right: 2px;
    color: #c62828;
    content: "\f00d";
    font: normal 9px/1 FontAwesome
}

table.browsersupport .bsPreIE::after, table.browserref .bsPreIE::after, table.bsReference .bsPreIE::after { content: "-ms-" }
table.browsersupport .bsPreFirefox::after, table.browserref .bsPreFirefox::after, table.bsReference .bsPreFirefox::after { content: "-moz-" }
table.browsersupport .bsPreChrome::after, table.browserref .bsPreChrome::after, table.bsReference .bsPreChrome::after { content: "-webkit-" }
table.browsersupport .bsPreSafari::after, table.browserref .bsPreSafari::after, table.bsReference .bsPreSafari::after { content: "-webkit-" }
table.browsersupport .bsPreOpera::after, table.browserref .bsPreOpera::after, table.bsReference .bsPreOpera::after { content: "-o-" }
table.browserref .bsPreXVOpera::after, table.bsReference .bsPreXVOpera::after { content: "-xv-" }
table.browsersupport td[class*="bsPre"]::after,
table.browserref td[class*="bsPre"]::after,
table.bsReference td[class*="bsPre"]::after {
    position: absolute;
    right: 1px;
    bottom: 0;
    background: #fff;
    color: #555;
    font: 7px/1 Arial, sans-serif
}


/* Site chrome only: example output in an iframe keeps the lesson's own CSS. */
body.code-page {
    margin: 0;
    padding-top: var(--topbar) !important;
    background: var(--canvas);
    color: var(--ink);
    font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
}
.code-page *, .code-page *::before, .code-page *::after { box-sizing: border-box; }
.code-page { scroll-padding-top: 84px; }
.code-page button, .code-page input, .code-page select, .code-page textarea { font: inherit; }
.code-page a { text-decoration: none; }
.code-page a:focus-visible, .code-page button:focus-visible, .code-page input:focus-visible { outline: 3px solid #9cbffc; outline-offset: 3px; }
.code-topbar {
    position: fixed; z-index: 1050; inset: 0 0 auto; height: var(--topbar);
    display: flex; align-items: center; border-bottom: 1px solid var(--line);
    background: rgba(255,255,255,.96); box-shadow: 0 1px 12px rgba(18,32,58,.035);
    backdrop-filter: blur(14px); line-height: 1.4;
}
.code-topbar .code-brand {
    display: flex; flex: 0 0 var(--sidebar); align-items: center; gap: 11px; height: 100%;
    border-right: 1px solid var(--line); padding: 0 20px; color: var(--ink); font-size: 17px; font-weight: 700; white-space: nowrap;
}
.code-brand-mark { display: grid; place-items: center; width: 34px; height: 34px; flex: 0 0 34px; border-radius: 10px; background: linear-gradient(145deg,#4d91ff,#2d69dc); color: #fff; box-shadow: 0 8px 18px rgba(54,123,245,.25); }
.code-brand-mark svg { width: 20px; height: 20px; fill: currentColor; }
.code-topnav { display: flex; align-items: center; justify-content: flex-end; flex: 1; gap: 8px; padding: 0 22px; }
.code-topbar .code-topnav a { display: inline-flex; align-items: center; min-height: 38px; border: 1px solid transparent; border-radius: 10px; padding: 0 13px; color: #647087; font-size: 14px; font-weight: 600; white-space: nowrap; }
.code-topbar .code-topnav a:hover, .code-topbar .code-topnav a.active { border-color: #dbe5f4; background: #f8faff; color: var(--brand-dark); }
.code-menu-toggle { display: none; align-items: center; justify-content: center; flex: 0 0 44px; width: 44px; min-height: 44px; border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--brand-dark); cursor: pointer; }
.code-menu-toggle svg { width: 21px; height: 21px; }
.code-menu-mask { display: none; }
.code-page .tutorial-header, .code-legacy > .logo-search, .code-legacy > .navigation,
.code-legacy > [data-ossoft-course-return], .code-editor > .navbar, .code-web-editor > .navbar,
.code-legacy .right-column, .code-legacy > #footer, .code-legacy > .fixed-btn,
.code-reader > .tutorial-footer, .code-editor > footer { display: none !important; }
.code-reader .tutorial-layout, .code-legacy > .container.main {
    display: block; width: calc(100% - var(--sidebar)); max-width: 1440px;
    margin: 0 0 0 var(--sidebar); padding: 28px clamp(22px,3vw,48px) 36px;
}
.code-reader .tutorial-layout.code-no-sidebar { width: 100%; max-width: 1200px; margin: 0 auto; }
.code-radius #container { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; width: 100%; max-width: 780px; }
.code-radius #container .input_wrapper { position: static; width: auto; height: auto; text-align: left !important; }
.code-radius #container .input_wrapper label { display: block; margin-bottom: 5px; color: var(--text); font-size: 14px; }
.code-radius #container .input_wrapper input { position: static; width: 100% !important; min-height: 44px; border: 1px solid #dfe5ee; border-radius: 9px; padding: 8px 12px; background: #fff; color: var(--ink); text-align: left; font-size: 16px; }
.code-radius #input_wrapper_tl { grid-area: 1 / 1; }
.code-radius #input_wrapper_tr { grid-area: 1 / 2; }
.code-radius #input_wrapper_bl { grid-area: 3 / 1; }
.code-radius #input_wrapper_br { grid-area: 3 / 2; }
.code-radius #container #surface { grid-area: 2 / 1 / auto / -1; width: 100%; min-width: 0; border-color: var(--line); padding: 20px; background: #f8faff; box-shadow: none; }
.code-radius #container #surface textarea { width: 100%; height: 260px; border-color: var(--line); border-radius: 8px; padding: 12px; background: #fff; color: var(--ink); }
.code-legacy > .container.main > .row { display: block; width: 100%; max-width: none; margin: 0; padding: 0; }
.code-reader .tutorial-sidebar, .code-legacy .left-column {
    position: fixed; z-index: 1040; top: var(--topbar); left: 0; bottom: 0;
    display: block; float: none; width: var(--sidebar); max-height: none; height: auto;
    margin: 0; padding: 18px 12px 28px; overflow: auto; overscroll-behavior: contain;
    border: 0; border-right: 1px solid var(--line); border-radius: 0; background: #f8faff;
    color: var(--text); font-size: 14px; line-height: 1.6; scrollbar-width: thin;
}
.code-reader .tutorial-sidebar a, .code-legacy #leftcolumn a {
    display: block; float: none; min-height: 40px; margin: 2px 0; border: 0; border-radius: 9px;
    padding: 9px 12px; background: transparent; color: #5c6880; font-size: 14px; line-height: 1.6;
    text-indent: 0; overflow-wrap: anywhere;
}
.code-reader .tutorial-sidebar a:hover, .code-legacy #leftcolumn a:hover,
.code-reader .tutorial-sidebar a.active, .code-legacy #leftcolumn a.code-current {
    background: var(--brand-soft); color: var(--brand-dark); text-decoration: none;
}
.code-reader .tutorial-sidebar a.active, .code-legacy #leftcolumn a.code-current { background: var(--brand-soft) !important; color: var(--brand-dark) !important; font-weight: 700; }
.code-page .code-sidebar-back, .code-reader .tutorial-sidebar .tutorial-back { display: block; margin: 0 0 14px; border-bottom: 1px solid var(--line); border-radius: 0; padding: 8px 12px 16px; color: var(--brand-dark); font-size: 14px; font-weight: 700; }
.code-legacy .left-column .tab { margin: 0; border: 0; padding: 8px 12px; background: transparent; color: var(--muted); font-size: 13px; }
.code-legacy .left-column .sidebar-box { width: auto; margin: 0; border: 0; padding: 0; background: transparent; }
.code-legacy #moon, .code-legacy #sun { display: none !important; }
.code-legacy .middle-column { float: none; width: 100%; margin: 0; padding: 0; }
.code-reader .tutorial-content, .code-legacy .middle-column > .article {
    min-width: 0; width: 100%; overflow: hidden; margin: 0; border: 1px solid var(--line); border-radius: 16px;
    padding: 28px clamp(20px,4vw,48px) 40px; background: var(--surface); box-shadow: 0 8px 28px rgba(26,43,70,.04);
}
.code-legacy .article-body { padding: 0; }
.code-reader .tutorial-content h1, .code-legacy .article-intro h1 { margin: 0 0 24px; color: var(--ink); font-size: clamp(25px,3vw,32px); font-weight: 700; line-height: 1.4; }
.code-reader .tutorial-content h1 span, .code-legacy .article-intro h1 span { color: var(--brand); }
.code-reader .tutorial-content h2, .code-legacy .article-intro h2 { margin: 30px 0 14px; border-bottom: 1px solid var(--line); padding-bottom: 10px; color: var(--ink); font-size: 23px; line-height: 1.5; }
.code-reader .tutorial-content h3, .code-legacy .article-intro h3 { margin: 24px 0 12px; color: var(--ink); font-size: 19px; }
.code-legacy .article-intro p { margin: 14px 0; font-size: 16px; line-height: 1.85; }
.code-page .article-intro { min-width: 0; color: var(--text); overflow-wrap: anywhere; }
.code-page .article-intro a { color: var(--brand-dark); }
.code-page .article-intro img { max-width: 100%; height: auto; }
.code-page .article-intro iframe { max-width: 100%; }
.code-page .article-intro .example { margin: 20px 0; border: 1px solid var(--line); border-radius: 12px; padding: 16px; background: #fafcff; }
.code-page :is(.article-intro, .tutorial-content) div.example:has(> h2.example_head + .example_result) {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    width: 100%;
    margin: 18px 0;
    border: 1px solid var(--line, #e7ebf2);
    border-radius: 10px;
    padding: 0;
    background: #fff;
    box-shadow: none;
}
.code-page :is(.article-intro, .tutorial-content) div.example:has(> h2.example_head + .example_result) > h2.example_head {
    min-height: 44px;
    margin: 0;
    border: 0;
    border-radius: 0;
    padding: 10px 14px;
    background: transparent;
    color: var(--ink, #172033);
    font: 600 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}
.code-page :is(.article-intro, .tutorial-content) div.example:has(> h2.example_head + .example_result) > .example_result {
    width: 100%;
    margin: 0;
    border: 0;
    border-top: 1px solid var(--line, #e7ebf2);
    border-radius: 0;
    padding: 14px;
    background: #f6f8fb;
}
.code-page :is(.article-intro, .tutorial-content) div.example:has(> h2.example_head + .example_result) > br { display: none; }
.code-page :is(.article-intro, .tutorial-content) div.example:has(> h2.example_head + .example_result) > a.tryitbtn {
    align-self: flex-start;
    min-height: 32px;
    margin: 10px 14px;
    border: 0;
    border-radius: 6px;
    padding: 5px 10px;
    background: var(--brand, #367bf5);
    color: #fff !important;
    font: 600 12px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    white-space: nowrap;
}
.code-page .article-intro pre, .code-page .article-intro .example_code { max-width: 100%; overflow: auto; border: 1px solid var(--line); border-radius: 9px; padding: 16px; background: #f6f8fb; color: var(--ink); font: 14px/1.75 SFMono-Regular,Consolas,"Liberation Mono",monospace; tab-size: 4; white-space: pre-wrap; overflow-wrap: anywhere; }
.code-page .article-intro a.tryitbtn, .code-page .article-intro a.tryitbtn:visited, .code-page .article-intro a.tryit, .code-page .article-intro a.showbtn {
    display: inline-flex; align-items: center; min-height: 40px; border: 0; border-radius: 9px; padding: 7px 16px; background: var(--brand); color: #fff !important; font-size: 14px; line-height: 1.5;
}
.code-page .article-intro a.tryitbtn:hover { background: var(--brand-dark); }
.code-table-scroll { max-width: 100%; overflow-x: auto; overscroll-behavior-x: contain; margin: 20px 0; }
.code-page .code-table-scroll table { display: table; width: 100%; max-width: none; margin: 0; border-collapse: collapse; font-size: 14px; }
.code-page .code-table-scroll th, .code-page .code-table-scroll td { min-width: 80px; border: 1px solid var(--line); padding: 10px 12px; color: var(--text); line-height: 1.7; }
.code-page .code-table-scroll th { background: #f3f6fb; color: var(--ink); }
.code-page .code-table-scroll tr:nth-child(even) td { background: #fafbfe; }
.code-page .previous-next-links { display: flex; justify-content: space-between; gap: 16px; margin: 18px 0; border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; background: #f8faff; box-shadow: none; }
.code-page .previous-next-links a { color: var(--brand-dark); }
.code-page .runoob-quiz-container { padding: 8px 0; }
.code-page .runoob-quiz-card { border: 1px solid var(--line); box-shadow: none; }
.code-page .runoob-quiz-option { padding: 14px; font-size: 16px; overflow-wrap: anywhere; }
.code-page .runoob-quiz-option:hover { border-color: var(--brand); box-shadow: none; transform: none; }
.code-page .runoob-quiz-option-letter { flex: 0 0 32px; }
.code-page .runoob-quiz-option.selected .runoob-quiz-option-letter, .code-page .runoob-quiz-progress-bar, .code-page .runoob-quiz-btn-primary { background: var(--brand); }
.code-page .runoob-quiz-btn-primary:hover { background: var(--brand-dark); }
.code-page .runoob-quiz-btn { min-height: 44px; border-radius: 9px; font-size: 14px; }
.code-page .runoob-quiz-question-number { background: var(--brand-soft); color: var(--brand-dark); }
.code-page .runoob-quiz-score-display { color: var(--brand); }
.code-page .runoob-quiz-explanation.show { max-height: none; }
.code-breadcrumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; margin: 0 0 18px; color: var(--muted); font-size: 13px; line-height: 1.6; }
.code-breadcrumbs a { color: var(--brand-dark); }
.code-footer { display: flex; justify-content: space-between; gap: 20px; margin: 32px 0 0; border-top: 1px solid var(--line); padding: 20px 0 0; color: var(--muted); font-size: 12px; }
.code-footer a { color: var(--brand-dark); }
.code-page .code-ad-obsolete, .code-page .code-ad[hidden] { display: none !important; }
.code-ad { clear: both; width: 100%; min-width: 0; margin: 28px auto 0; border: 1px solid var(--line); border-radius: 12px; padding: 12px; background: var(--surface); text-align: center; }
.code-ad-label { display: block; margin-bottom: 8px; color: var(--muted); font-size: 11px; line-height: 1.5; text-align: center; }
.code-ad .adsbygoogle { display: block; min-height: 100px; margin: 0 auto; text-align: center; }
.code-editor > .container, .code-web-editor > .container, .code-demo > .code-demo-content {
    width: 100%; max-width: 1600px; margin: 0 auto; padding: 26px clamp(14px,3vw,40px);
}
.code-editor > .container > .row, .code-editor > .container > .row-fluid { display: flex; align-items: stretch; flex-wrap: wrap; margin: 0 -10px; }
.code-editor > .container > .row > [class*='col-'], .code-editor > .container > .row-fluid > [class*='col-'] { min-width: 0; float: none; padding: 0 10px; }
.code-editor .panel, .code-web-editor .panel { overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: 0 8px 28px rgba(26,43,70,.04); }
.code-editor .panel-heading, .code-web-editor .panel-heading { border-bottom: 1px solid var(--line); padding: 14px; background: #f8faff; color: var(--ink); }
.code-editor .panel-body { padding: 14px; }
.code-editor .btn, .code-web-editor .btn { min-height: 40px; border-radius: 9px; font-size: 14px; }
.code-editor .btn-success, .code-web-editor .btn-success, .code-web-editor .btn-primary { border-color: var(--brand); background: var(--brand); color: #fff; }
.code-editor .btn-success:hover, .code-web-editor .btn-success:hover { background: var(--brand-dark); }
.code-editor .CodeMirror { height: 58vh; min-height: 340px; max-height: 800px; border: 1px solid var(--line); border-radius: 9px; font-size: 14px; line-height: 1.65; }
.code-editor #iframeResult { height: 58vh; min-height: 340px; border-radius: 8px; }
.code-editor .alert { margin: 0 0 18px; border-radius: 10px; font-size: 14px; }
.code-web-editor .modal-dialog { max-width: calc(100vw - 24px); }
.code-web-editor #ossoft-content { margin-left: 0; margin-right: 0; }
.code-web-editor #ossoft-content > .col-md-12 { padding-left: 0; padding-right: 0; }
.code-web-editor .jqx-splitter { border-color: var(--line); }
.code-web-editor .CodeMirror { font-size: 14px; line-height: 1.65; }
.code-web-editor .windowLabel .label { border-radius: 6px; background: var(--brand-soft); color: var(--brand-dark); }
.code-page.code-tool { padding-top: 0 !important; }
@media (max-width: 900px) {
    .code-topnav { gap: 2px; padding: 0 14px; }
    .code-topbar .code-topnav a { padding: 0 10px; }
    .code-topbar .code-topnav .code-nav-recent, .code-topbar .code-topnav .code-nav-favorites { display: none; }
}
@media (max-width: 760px) {
    body.code-page { --topbar: 58px; }
    .code-topbar { padding: 0 12px; gap: 8px; }
    .code-topbar .code-brand { min-width: 0; flex: 1; gap: 8px; width: auto; border: 0; padding: 0; font-size: 16px; }
    .code-brand-mark { width: 31px; height: 31px; flex-basis: 31px; border-radius: 9px; }
    .code-topnav { flex: 0 0 auto; padding: 0; }
    .code-topbar .code-topnav a { min-height: 44px; padding: 0 10px; font-size: 13px; }
    .code-topnav .code-nav-home, .code-topnav .code-nav-editor { display: none !important; }
    .code-menu-toggle { display: inline-flex; }
    .code-reader .tutorial-layout, .code-legacy > .container.main { width: 100%; margin: 0; padding: 18px 13px 28px; }
    .code-reader .tutorial-sidebar, .code-legacy .left-column { width: min(300px,86vw); max-height: none; transform: translateX(-105%); transition: transform .2s ease; box-shadow: 20px 0 45px rgba(25,40,68,.15); }
    .code-menu-open { overflow: hidden; }
    .code-menu-open .tutorial-sidebar, .code-menu-open .left-column { transform: translateX(0); }
    .code-menu-mask { position: fixed; z-index: 1035; inset: var(--topbar) 0 0; display: block; visibility: hidden; opacity: 0; width: 100%; border: 0; background: rgba(17,27,45,.38); transition: opacity .2s ease; }
    .code-menu-open .code-menu-mask { visibility: visible; opacity: 1; }
    .code-reader .tutorial-sidebar a, .code-legacy #leftcolumn a { min-height: 44px; padding-top: 11px; padding-bottom: 11px; }
    .code-reader .tutorial-content, .code-legacy .middle-column > .article { border-radius: 14px; padding: 22px 17px 28px; }
    .code-reader .tutorial-content h2, .code-legacy .article-intro h2 { font-size: 21px; }
    .code-page .runoob-quiz-content { padding: 14px; }
    .code-page .runoob-quiz-question-text { font-size: 18px; }
    .code-legacy .article-intro .tutorialimage { float: none !important; width: auto !important; min-width: 0 !important; margin: 10px 0 !important; }
    .code-page .previous-next-links { padding: 10px; font-size: 13px; }
    .code-footer { flex-direction: column; gap: 8px; }
    .code-ad { margin-top: 22px; padding: 10px; }
    .code-editor > .container, .code-web-editor > .container { padding: 18px 13px; }
    .code-editor > .container > .row, .code-editor > .container > .row-fluid { margin: 0; }
    .code-editor > .container > .row > [class*='col-'], .code-editor > .container > .row-fluid > [class*='col-'] { width: 100%; padding: 0; }
    .code-editor .panel-heading { padding: 10px; }
    .code-editor .btn, .code-web-editor .btn { min-height: 44px; }
    .code-editor .CodeMirror, .code-editor #iframeResult { height: 360px; min-height: 280px; }
    .code-editor #textareaCode, .code-web-editor textarea { font-size: 16px; }
    .code-web-editor #splitContainer, .code-web-editor #leftSplitter, .code-web-editor #rightSplitter { display: flex !important; flex-direction: column; position: relative !important; width: 100% !important; height: auto !important; overflow: visible !important; }
    .code-web-editor #splitContainer > div, .code-web-editor #leftSplitter > div, .code-web-editor #rightSplitter > div { position: relative !important; inset: auto !important; width: 100% !important; min-width: 0 !important; height: auto !important; min-height: 0 !important; overflow: visible !important; }
    .code-web-editor .jqx-splitter-splitbar-vertical, .code-web-editor .jqx-splitter-splitbar-horizontal { display: none !important; }
    .code-web-editor .CodeMirror { height: 260px !important; min-height: 260px; }
    .code-web-editor #output, .code-web-editor #iframeResult { height: 360px !important; min-height: 360px; }
    .code-web-editor .panel-heading form { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
    .code-web-editor .panel-heading .form-control { max-width: 100%; font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) { .code-page *, .code-page *::before, .code-page *::after { scroll-behavior: auto !important; transition: none !important; } }

/* Compact tutorial examples: heading, code and a small run action below. */
.code-page :is(.article-intro, .tutorial-content) div.example.example-compact {
    position: relative;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    width: 100%;
    margin: 18px 0;
    scroll-margin-top: 84px;
    border: 1px solid var(--line, #e7ebf2);
    border-radius: 10px;
    padding: 0;
    background: #fff;
    box-shadow: none;
}
.code-page :is(.article-intro, .tutorial-content) .example-compact > h2,
.code-page :is(.article-intro, .tutorial-content) .example-compact > h3 {
    min-width: 0;
    min-height: 44px;
    margin: 0;
    border: 0;
    border-radius: 0;
    padding: 10px 56px 10px 14px;
    background: transparent;
    color: var(--ink, #172033);
    font: 600 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}
.code-page :is(.article-intro, .tutorial-content) .example-compact:has(> .browser-support-icons + :is(h2.example, h2.example_head)) {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
}
.code-page :is(.article-intro, .tutorial-content) .example-compact:has(> .browser-support-icons + :is(h2.example, h2.example_head)) > :is(h2.example, h2.example_head) {
    flex: 1 1 0;
    order: 1;
}
.code-page :is(.article-intro, .tutorial-content) .example-compact:has(> .browser-support-icons + :is(h2.example, h2.example_head)) > .browser-support-icons {
    float: none;
    width: auto;
    flex: 0 0 auto;
    order: 2;
    margin: 0 14px 0 8px;
}
.code-page :is(.article-intro, .tutorial-content) .example-compact:has(> .browser-support-icons + :is(h2.example, h2.example_head)) > :not(.browser-support-icons):not(:is(h2.example, h2.example_head)):not(a.showbtn):not(a.tryitbtn):not(a.tryit):not(a[href^="/try/"]) {
    flex: 0 0 100%;
    order: 3;
}
.code-page :is(.article-intro, .tutorial-content) .example-compact:has(> .browser-support-icons + :is(h2.example, h2.example_head)) > :is(a.showbtn, a.tryitbtn, a.tryit, a[href^="/try/"]) {
    flex: 0 0 auto;
    order: 4;
}
.code-page :is(.article-intro, .tutorial-content) .example-compact > :is(.example_code, pre) {
    width: 100%;
    min-width: 0;
    min-height: 0;
    margin: 0;
    border: 0;
    border-top: 1px solid var(--line, #e7ebf2);
    border-radius: 0;
    padding: 12px 14px;
    background: #f6f8fb;
    box-shadow: none;
    font: 13px/1.7 SFMono-Regular, Consolas, "Liberation Mono", monospace;
    tab-size: 4;
    word-break: normal;
}
.code-page :is(.article-intro, .tutorial-content) .example-compact > :is(.example_code, pre):has(> .hl-main) { white-space: normal; }
.code-page :is(.article-intro, .tutorial-content) .example-compact .hl-main {
    margin: 0;
    border: 0;
    padding: 0;
    background: transparent;
    font: inherit;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}
.code-page :is(.article-intro, .tutorial-content) .example-compact > :is(.example_code, pre):first-child { border-top: 0; }
.code-page :is(.article-intro, .tutorial-content) .example-compact > h4 { min-height: 44px; margin: 0; border: 0; padding: 10px 56px 10px 14px; background: transparent; font-size: 15px; line-height: 1.5; }
.code-page :is(.article-intro, .tutorial-content) .example-compact > p { margin: 0; padding: 8px 14px; }
.code-page :is(.article-intro, .tutorial-content) .example-compact > br { display: none; }
.code-page :is(.article-intro, .tutorial-content) .example-compact > .example-copy { position: absolute; top: 6px; right: 10px; }
.code-page :is(.article-intro, .tutorial-content) .example-copy {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    margin: 0;
    border: 1px solid transparent;
    border-radius: 6px;
    padding: 0;
    background: transparent;
    color: #617086;
    font: 12px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    cursor: pointer;
}
.code-page :is(.article-intro, .tutorial-content) .example-copy[hidden] { display: none; }
.code-page :is(.article-intro, .tutorial-content) .example-copy svg { display: block; width: 16px; height: 16px; flex-shrink: 0; }
.code-page :is(.article-intro, .tutorial-content) .example-copy-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.code-page :is(.article-intro, .tutorial-content) .example-copy:hover { border-color: #dce3ec; background: #fff; color: var(--brand-dark, #2463d4); }
.code-page :is(.article-intro, .tutorial-content) .example-copy:disabled { opacity: .6; cursor: wait; }
.code-page :is(.article-intro, .tutorial-content) .example-copy.is-copied { border-color: #c4e2d2; background: #f0faf4; color: #247449; }
.code-page :is(.article-intro, .tutorial-content) .example-copy.is-copy-error { border-color: #f0d4d4; background: #fff5f5; color: #a64b4b; }
.code-page :is(.article-intro, .tutorial-content) .tutorial-code-block { position: relative; margin: 14px 0; }
.code-page :is(.article-intro, .tutorial-content) .tutorial-code-block > :is(pre, .example_code) {
    width: 100%;
    min-height: 48px;
    margin: 0;
    padding: 12px 56px 12px 14px;
    font: 13px/1.7 SFMono-Regular, Consolas, "Liberation Mono", monospace;
    tab-size: 4;
}
.code-page :is(.article-intro, .tutorial-content) .tutorial-code-block > :is(.example_code, pre) { max-width: 100%; overflow: auto; border: 1px solid var(--line, #e7ebf2); border-radius: 9px; background: #f6f8fb; color: var(--ink, #172033); white-space: pre-wrap; overflow-wrap: anywhere; word-break: normal; }
.code-page :is(.article-intro, .tutorial-content) .tutorial-code-block .hl-main { margin: 0; border: 0; padding: 0; background: transparent; font: inherit; white-space: pre-wrap; overflow-wrap: anywhere; }
.code-page :is(.article-intro, .tutorial-content) .tutorial-code-block > :is(.example_code, pre):has(> .hl-main) { white-space: normal; }
.code-page :is(.article-intro, .tutorial-content) .example-compact > .tutorial-code-block { margin: 0; }
.code-page :is(.article-intro, .tutorial-content) .example-compact > .tutorial-code-block > :is(pre, .example_code) { border-width: 1px 0 0; border-radius: 0; }
.code-page :is(.article-intro, .tutorial-content) .example-compact > .tutorial-code-block:first-child > :is(pre, .example_code) { border-top: 0; }
.code-page :is(.article-intro, .tutorial-content) .tutorial-code-block > .example-copy {
    position: absolute;
    top: 7px;
    right: 10px;
    margin: 0;
}
.code-page :is(.article-intro, .tutorial-content) :is(.example-compact > :is(a.showbtn, a.tryitbtn, a.tryit, a[href^="/try/"]), .tutorial-code-block > .example-run) {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    align-self: flex-start;
    min-height: 32px;
    margin: 10px 14px;
    border: 0;
    border-radius: 6px;
    padding: 5px 10px;
    background: var(--brand, #367bf5);
    color: #fff;
    font: 600 12px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    white-space: nowrap;
}
@media (max-width: 480px) {
    .code-page :is(.article-intro, .tutorial-content) div.example:has(> h2.example_head + .example_result) > h2.example_head { min-height: 48px; padding: 10px; font-size: 13px; }
    .code-page :is(.article-intro, .tutorial-content) div.example:has(> h2.example_head + .example_result) > a.tryitbtn { min-height: 40px; margin: 10px; }
    .code-page :is(.article-intro, .tutorial-content) .example-compact > h2,
    .code-page :is(.article-intro, .tutorial-content) .example-compact > h3,
    .code-page :is(.article-intro, .tutorial-content) .example-compact > h4 { min-height: 48px; padding: 10px 64px 10px 10px; font-size: 13px; }
    .code-page :is(.article-intro, .tutorial-content) .example-compact > :is(.example_code, pre) { padding: 10px; }
    .code-page :is(.article-intro, .tutorial-content) .example-copy { width: 40px; height: 40px; min-height: 40px; }
    .code-page :is(.article-intro, .tutorial-content) .example-compact > .example-copy { top: 4px; right: 8px; }
    .code-page :is(.article-intro, .tutorial-content) :is(.example-compact > :is(a.showbtn, a.tryitbtn, a.tryit, a[href^="/try/"]), .tutorial-code-block > .example-run) { min-height: 40px; margin: 10px; }
    .code-page :is(.article-intro, .tutorial-content) .tutorial-code-block > :is(pre, .example_code) { min-height: 52px; padding-right: 62px; padding-left: 10px; }
    .code-page :is(.article-intro, .tutorial-content) .tutorial-code-block > .example-copy { top: 6px; right: 8px; min-height: 40px; }
}