/* Cybersecurity Survival Notes: original, small documentation interface. No frameworks. */
:root {
  color-scheme: light;
  --page: #ffffff;
  --sidebar: #f7f8fa;
  --surface: #f7f8fa;
  --surface-hover: #eeeff2;
  --text: #424751;
  --strong: #171b22;
  --muted: #68717c;
  --border: #e3e5e8;
  --border-strong: #cbd0d7;
  --active-bg: #e9edf3;
  --code-bg: #20242b;
  --code-text: #f1f2f4;
  --link: #354e70;
  --shadow: 0 22px 65px rgba(17, 24, 39, .12);
  --header: 64px;
  --side: 263px;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', monospace;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #1c2026;
  --sidebar: #191d22;
  --surface: #252a31;
  --surface-hover: #303640;
  --text: #c3cbd4;
  --strong: #f0f2f5;
  --muted: #a0a9b5;
  --border: #343b44;
  --border-strong: #4b5664;
  --active-bg: #303842;
  --code-bg: #12161c;
  --code-text: #e9edf2;
  --link: #b4c8e7;
  --shadow: 0 26px 75px rgba(0,0,0,.39);
}
*,*::before,*::after { box-sizing: border-box; }
html { scroll-padding-top: 90px; scroll-behavior: smooth; }
body { margin: 0; background: var(--page); color: var(--text); font: 15px/1.75 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--strong); }
button,input { font: inherit; }
button { cursor: pointer; }
button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible { outline: 2px solid var(--link); outline-offset: 3px; }
[hidden] { display: none !important; }
.sr-only { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
.skip-link { position:fixed; z-index:100; top:-100px; left:12px; padding:8px 12px; border-radius:6px; background:var(--strong); color:var(--page); }
.skip-link:focus { top:12px; }
.topbar { position:sticky; z-index:30; top:0; height:var(--header); background:var(--page); border-bottom:1px solid var(--border); }
.topbar-inner { height:100%; display:flex; align-items:center; justify-content:space-between; max-width:1600px; margin:auto; gap:14px; padding:0 30px; }
.brand { min-width:0; font-weight:700; font-size:14px; letter-spacing:-.015em; line-height:1.2; color:var(--strong); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.top-actions { display:flex; align-items:center; gap:5px; flex-shrink:0; }
.quiet-button,.github-nav,.nav-button { border:1px solid transparent; border-radius:6px; padding:7px 10px; background:transparent; font-size:12px; color:var(--muted); line-height:1.5; white-space:nowrap; }
.quiet-button:hover,.github-nav:hover,.nav-button:hover { background:var(--surface-hover); color:var(--strong); }
.key-hint { margin-left:8px; padding:1px 5px; border:1px solid var(--border); border-radius:4px; font:11px var(--mono); color:var(--muted); }
.github-nav { color:var(--strong); }
.nav-button { display:none; }
.layout { max-width:1600px; margin:auto; display:grid; grid-template-columns:var(--side) minmax(0,1fr) 214px; min-height:calc(100vh - var(--header)); }
.sidebar { min-width:0; background:var(--sidebar); border-right:1px solid var(--border); }
.sidebar-inner { position:sticky; top:var(--header); max-height:calc(100vh - var(--header)); overflow-y:auto; padding:24px 17px 42px; scrollbar-width:thin; }
.nav-home,.nav-group > summary,.nav-item { font-size:13px; line-height:1.55; }
.nav-home { display:block; padding:9px 12px; border-radius:6px; font-weight:640; color:var(--strong); }
.nav-home:hover,.nav-group > summary:hover,.nav-item:hover { background:var(--surface-hover); }
.nav-group { margin:18px 0 0; }
.nav-group > summary { cursor:pointer; list-style:none; display:flex; gap:8px; align-items:center; justify-content:space-between; border-radius:6px; padding:7px 12px; font-weight:650; color:var(--strong); }
.nav-group > summary::after { content:'›'; font-size:19px; font-weight:400; line-height:1; color:var(--muted); transform:rotate(0deg); transition:transform .13s; }
.nav-group[open] > summary::after { transform:rotate(90deg); }
.nav-group > summary::-webkit-details-marker { display:none; }
.nav-list { display:flex; flex-direction:column; gap:2px; margin:5px 0 0; }
.nav-item { color:var(--muted); border-radius:6px; display:block; padding:6px 10px 6px 24px; }
.nav-home.active,.nav-item.active { background:var(--active-bg); color:var(--strong); font-weight:670; }
.main { min-width:0; }
.content { margin:0 auto; max-width:875px; padding:45px clamp(25px,4.1vw,66px) 64px; }
.home h1 { margin:0 0 34px; color:var(--strong); font-size:clamp(28px,3.1vw,39px); line-height:1.2; letter-spacing:-.04em; font-weight:730; }
.topic-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:16px; }
.topic { background:var(--page); border:1px solid var(--border); border-radius:9px; padding:23px 24px 21px; transition:border-color .13s, box-shadow .13s; }
.topic:hover { border-color:var(--border-strong); box-shadow:0 3px 12px rgba(0,0,0,.025); }
.topic h2 { margin:0 0 14px; font-size:17px; line-height:1.35; color:var(--strong); letter-spacing:-.015em; font-weight:680; }
.topic ul { list-style:none; margin:0; padding:0; }
.topic li { margin:0; }
.topic li a { display:block; padding:5px 0; color:var(--muted); font-size:13.5px; line-height:1.5; }
.topic li a:hover { color:var(--link); text-decoration:underline; text-underline-offset:4px; }
.breadcrumbs { display:flex; align-items:center; gap:11px; margin:0 0 20px; color:var(--muted); font-size:12px; }
.breadcrumbs a:hover { text-decoration:underline; }
.article h1 { margin:0 0 31px; font-size:clamp(29px,3.2vw,39px); font-weight:730; color:var(--strong); line-height:1.23; letter-spacing:-.036em; }
.md-body { overflow-wrap:break-word; }
.md-body > :first-child { margin-top:0; }
.md-body h2,.md-body h3,.md-body h4,.md-body h5 { color:var(--strong); font-weight:660; letter-spacing:-.015em; scroll-margin-top:90px; line-height:1.35; }
.md-body h2 { margin:42px 0 17px; padding-top:18px; border-top:1px solid var(--border); font-size:23px; }
.md-body h3 { margin:31px 0 12px; font-size:18px; }
.md-body h4 { margin:22px 0 9px; font-size:15px; }
.md-body p { margin:13px 0 17px; }
.md-body ul,.md-body ol { padding-left:23px; margin:12px 0 20px; }
.md-body li { margin:5px 0; padding-left:3px; }
.md-body li::marker { color:var(--muted); }
.md-body strong { color:var(--strong); font-weight:690; }
.md-body a { color:var(--link); text-decoration:underline; text-decoration-color:var(--border-strong); text-underline-offset:3px; }
.md-body a:hover { text-decoration-color:currentColor; }
.md-body blockquote { margin:24px 0; padding:3px 0 3px 16px; border-left:3px solid var(--border-strong); color:var(--muted); }
.md-body hr { margin:30px 0; border:0; border-top:1px solid var(--border); }
.md-body :not(pre)>code { padding:2px 5px; background:var(--surface); border:1px solid var(--border); border-radius:4px; font:.84em/1.6 var(--mono); color:var(--strong); }
.md-body table { display:block; overflow-x:auto; max-width:100%; border-collapse:collapse; width:max-content; min-width:min(100%,590px); margin:22px 0; font-size:13px; line-height:1.55; }
.md-body th,.md-body td { border:1px solid var(--border); padding:10px 12px; min-width:85px; text-align:left; vertical-align:top; }
.md-body th { background:var(--surface); color:var(--strong); font-weight:660; }
.md-body img { max-width:100%; height:auto; }
.md-body input[type=checkbox] { accent-color:var(--link); }
.heading-anchor { padding:0 7px; color:var(--muted); opacity:0; font-size:.75em; text-decoration:none!important; }
.md-body h2:hover .heading-anchor,.md-body h3:hover .heading-anchor,.heading-anchor:focus { opacity:1; }
.code-block { overflow:hidden; margin:23px 0 27px; background:var(--code-bg); color:var(--code-text); border-radius:7px; border:1px solid var(--border-strong); }
.code-bar { height:37px; display:flex; align-items:center; padding:0 12px 0 18px; border-bottom:1px solid #404650; color:#aab2be; font:11px var(--mono); }
.copy-code { margin-left:auto; padding:5px 8px; border:0; background:transparent; border-radius:4px; color:#cbd3dd; font:11px var(--mono); }
.copy-code:hover { background:#353d48; color:#fff; }
.md-body pre { overflow:auto; margin:0; padding:17px 19px; tab-size:4; font:12.5px/1.7 var(--mono); white-space:pre; }
.md-body pre code { padding:0; border:0; background:transparent; color:var(--code-text); font:inherit; }
.md-body pre .c,.md-body pre .c1,.md-body pre .cm { color:#9aa4af; }
.md-body pre .s,.md-body pre .s1,.md-body pre .s2 { color:#dfc3a5; }
.md-body pre .k,.md-body pre .kn,.md-body pre .kd { color:#c0ccde; }
.toc { position:sticky; top:var(--header); align-self:start; max-height:calc(100vh - var(--header)); overflow-y:auto; padding:38px 20px 25px 10px; font-size:12px; }
.toc-label { display:block; font-weight:650; color:var(--strong); margin-bottom:13px; }
.toc-item { display:block; padding:6px 12px; border-left:1px solid var(--border); color:var(--muted); line-height:1.5; }
.toc-item:hover { color:var(--strong); border-color:var(--border-strong); }
.pager { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:13px; margin:54px 0 25px; }
.pager-link { padding:15px 17px; border:1px solid var(--border); border-radius:7px; }
.pager-link:hover { border-color:var(--border-strong); background:var(--surface); }
.pager-link span { display:block; font-size:11px; color:var(--muted); margin-bottom:5px; }
.pager-link strong { font-size:13px; color:var(--strong); }
.source-link { margin-top:42px; font-size:12px; color:var(--muted); }
.source-link a:hover { text-decoration:underline; }
.footer { display:flex; justify-content:flex-end; gap:10px; margin-top:65px; padding-top:18px; border-top:1px solid var(--border); color:var(--muted); font-size:11px; }
.footer nav { display:flex; flex-wrap:wrap; gap:18px; }
.footer a:hover { color:var(--strong); text-decoration:underline; }
.search-overlay { position:fixed; z-index:80; inset:0; display:flex; align-items:flex-start; justify-content:center; padding:12vh 18px 25px; background:rgba(10,15,22,.5); }
.search-panel { width:min(100%,590px); max-height:82vh; overflow:hidden; background:var(--page); border:1px solid var(--border-strong); border-radius:9px; box-shadow:var(--shadow); }
.search-top { padding:12px; display:flex; align-items:center; gap:8px; border-bottom:1px solid var(--border); }
.search-top input { flex:1; min-width:0; padding:7px 9px; border:0; outline:none; background:var(--page); color:var(--strong); font-size:16px; }
.search-top button { padding:5px 10px; border-radius:5px; border:1px solid var(--border); background:var(--surface); font-size:12px; color:var(--text); }
.search-results { max-height:min(55vh,460px); overflow-y:auto; padding:6px; }
.search-results > p { margin:16px; color:var(--muted); font-size:13px; }
.search-item { display:block; padding:12px 13px; border-radius:5px; }
.search-item:hover,.search-item.selected { background:var(--surface-hover); }
.search-item strong { display:block; color:var(--strong); font-size:13px; font-weight:660; }
.search-item span { display:block; color:var(--muted); font-size:11px; }
@media(max-width:1250px) { .layout { grid-template-columns:var(--side) minmax(0,1fr); } .toc { display:none; } }
@media(max-width:800px) {
  :root { --header:58px; }
  .topbar-inner { padding:0 15px; gap:8px; }
  .brand { font-size:13px; }
  .top-actions { gap:0; }
  .quiet-button,.github-nav { padding:7px; font-size:12px; }
  .github-nav { display:none; }
  .key-hint { display:none; }
  .nav-button { display:block; padding:7px 8px 7px 0; color:var(--strong); }
  .layout { display:block; }
  .sidebar { position:fixed; z-index:50; top:var(--header); bottom:0; left:0; width:min(83vw,300px); background:var(--sidebar); transform:translateX(-110%); transition:transform .15s ease; box-shadow:none; }
  .sidebar.open { transform:translateX(0); box-shadow:var(--shadow); }
  .scrim:not([hidden]) { position:fixed; z-index:40; inset:var(--header) 0 0; background:rgba(0,0,0,.38); }
  .content { padding:32px 23px 55px; max-width:850px; }
}
@media(max-width:550px) {
  .topbar-inner { gap:4px; }
  .brand { font-size:12px; }
  .quiet-button { font-size:11px; padding:6px 5px; }
  .topic-grid { grid-template-columns:1fr; gap:12px; }
  .topic { padding:20px 20px 19px; }
  .home h1 { font-size:30px; margin-bottom:25px; }
  .article h1 { font-size:30px; }
  .content { padding:30px 18px 46px; }
  .pager { grid-template-columns:1fr; }
  .footer { margin-top:48px; }
}
@media(prefers-reduced-motion:reduce) { *,*::before,*::after { scroll-behavior:auto!important; transition:none!important; } }