/* ========================================================================
   Attacking Cloud Service Providers — interactive textbook
   Shared stylesheet. Dark "security console" theme.
   ======================================================================== */

:root{
  --bg:#0c1018;
  --bg-2:#121826;
  --bg-3:#1a2234;
  --panel:#151c2c;
  --ink:#d7dee8;
  --ink-dim:#9aa7bd;
  --ink-faint:#6b7a92;
  --line:#26314a;
  --line-soft:#1e2740;
  --cyan:#3fd0c9;
  --cyan-deep:#1f8f8a;
  --amber:#f0a93b;
  --red:#e5484d;
  --red-dim:#b4373b;
  --blue:#4f9cf0;
  --purple:#9d7be0;
  --green:#46c08a;
  --accent:var(--cyan);
  --header-bg:rgba(12,16,24,.94);
  --code-bg:#0a0d14;
  --code-ink:#d7dee8;
  --code-border:#222c44;
  --white:#ffffff;
  /* Prism token palette — dark */
  --t-comment:#7d8aa0;
  --t-punct:#b9c2d0;
  --t-tag:#e2777a;
  --t-funcname:#6196cc;
  --t-number:#f0a85a;
  --t-prop:#f8c555;
  --t-keyword:#c99cd6;
  --t-string:#8fd99a;
  --t-operator:#5fd0c9;
  --mono:"SF Mono",ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --sidebar-w:288px;
  --toc-w:230px;
}

/* ---- light theme ---- */
html[data-theme="light"]{
  --bg:#f4f6f9;
  --bg-2:#ffffff;
  --bg-3:#e9edf3;
  --panel:#ffffff;
  --ink:#1b2430;
  --ink-dim:#48566b;
  --ink-faint:#7a879c;
  --line:#d5dbe5;
  --line-soft:#e5e9f0;
  --cyan:#0c7f78;
  --cyan-deep:#0a605b;
  --amber:#b0700a;
  --red:#c23438;
  --red-dim:#9c2b2f;
  --blue:#2860c8;
  --purple:#6b4cc0;
  --green:#1c8a5c;
  --header-bg:rgba(255,255,255,.94);
  --code-bg:#f1f3f7;
  --code-ink:#2c3340;
  --code-border:#d8dde6;
  --white:#0c1018;
  /* Prism token palette — light */
  --t-comment:#7a869a;
  --t-punct:#586575;
  --t-tag:#c0392f;
  --t-funcname:#2860c8;
  --t-number:#b9580a;
  --t-prop:#9a6b00;
  --t-keyword:#7d3fb8;
  --t-string:#1c7d4d;
  --t-operator:#0a7d76;
}
html[data-theme="light"] body{color:var(--ink);}
html[data-theme="light"] h1.chapter-title,
html[data-theme="light"] .hero h1,
html[data-theme="light"] h2,
html[data-theme="light"] .callout-title,
html[data-theme="light"] .toc-card .tc-title{color:#0c1119;}
html[data-theme="light"] strong{color:#0c1119;}
html[data-theme="light"] .callout-case{background:#fbf6ec;}
html[data-theme="light"] .callout-lab{background:#eef7f1;}
html[data-theme="light"] .attack-flow .af-head,
html[data-theme="light"] thead th{background:#eef1f6;}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--serif);font-size:18px;line-height:1.72;
  -webkit-font-smoothing:antialiased;
}

/* ---- reading progress bar ---- */
#progress-bar{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  transition:width .1s linear;
}

/* ---- top header ---- */
header.topbar{
  position:fixed;top:0;left:0;right:0;height:54px;z-index:50;
  display:flex;align-items:center;gap:14px;padding:0 20px;
  background:var(--header-bg);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.theme-toggle{
  background:var(--bg-3);border:1px solid var(--line);color:var(--ink-dim);
  width:34px;height:32px;border-radius:7px;cursor:pointer;font-size:15px;
  display:grid;place-items:center;line-height:1;
}
.theme-toggle:hover{color:var(--cyan);border-color:var(--cyan-deep);}
.gh-link{
  background:var(--bg-3);border:1px solid var(--line);color:var(--ink-dim);
  width:34px;height:32px;border-radius:7px;
  display:grid;place-items:center;text-decoration:none;
}
.gh-link:hover{color:var(--cyan);border-color:var(--cyan-deep);}
.gh-link svg{display:block;}
header.topbar .brand{
  font-family:var(--mono);font-size:14px;font-weight:600;letter-spacing:.5px;
  color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:9px;
}
header.topbar .brand .logo{
  width:24px;height:24px;border:1.5px solid var(--cyan);border-radius:5px;
  display:grid;place-items:center;color:var(--cyan);font-size:13px;
}
header.topbar .brand b{color:var(--cyan);}
header.topbar .tag{
  font-family:var(--mono);font-size:11px;color:var(--ink-faint);
  border:1px solid var(--line);border-radius:20px;padding:2px 10px;
}
header.topbar .spacer{flex:1;}
#menu-toggle{
  display:none;background:none;border:1px solid var(--line);color:var(--ink);
  font-size:18px;border-radius:6px;width:36px;height:32px;cursor:pointer;
}

/* ---- sidebar nav ---- */
nav.sidebar{
  position:fixed;top:54px;bottom:0;left:0;width:var(--sidebar-w);z-index:40;
  background:var(--bg-2);border-right:1px solid var(--line);
  overflow-y:auto;padding:20px 0 60px;
}
nav.sidebar .nav-head{
  font-family:var(--mono);font-size:11px;letter-spacing:1.5px;
  text-transform:uppercase;color:var(--ink-faint);padding:6px 22px 10px;
}
nav.sidebar a{
  display:flex;gap:11px;align-items:baseline;
  padding:8px 22px;text-decoration:none;color:var(--ink-dim);
  font-family:var(--sans);font-size:14px;line-height:1.4;
  border-left:2.5px solid transparent;
}
nav.sidebar a .ch-num{
  font-family:var(--mono);font-size:11.5px;color:var(--ink-faint);
  min-width:22px;text-align:right;
}
nav.sidebar a:hover{background:var(--bg-3);color:var(--ink);}
nav.sidebar a.active{
  background:linear-gradient(90deg,rgba(63,208,201,.13),transparent);
  border-left-color:var(--cyan);color:var(--ink);
}
nav.sidebar a.active .ch-num{color:var(--cyan);}
nav.sidebar .nav-sep{height:1px;background:var(--line-soft);margin:14px 22px;}

/* ---- main column ---- */
main{
  margin-left:var(--sidebar-w);margin-top:54px;
  padding:54px 0 90px;display:flex;justify-content:center;
}
.chapter,.home{width:100%;max-width:820px;padding:0 40px;}

/* ---- chapter header ---- */
.chapter-eyebrow{
  font-family:var(--mono);font-size:12.5px;letter-spacing:2px;
  text-transform:uppercase;color:var(--cyan);margin-bottom:14px;
}
h1.chapter-title{
  font-family:var(--sans);font-weight:800;font-size:42px;line-height:1.12;
  margin:0 0 18px;color:#fff;letter-spacing:-.5px;
}
.chapter-objective{
  font-family:var(--sans);font-size:16px;color:var(--ink-dim);
  border-left:3px solid var(--cyan-deep);padding:8px 0 8px 16px;margin:0 0 8px;
}
.chapter-meta{
  font-family:var(--mono);font-size:12px;color:var(--ink-faint);
  border-bottom:1px solid var(--line);padding-bottom:22px;margin-bottom:34px;
}

/* ---- typography ---- */
h2{
  font-family:var(--sans);font-weight:750;font-size:27px;line-height:1.25;
  color:#fff;margin:52px 0 16px;padding-top:10px;letter-spacing:-.3px;
}
h2 .sec-num{color:var(--cyan);font-family:var(--mono);font-size:18px;margin-right:10px;}
h3{
  font-family:var(--sans);font-weight:700;font-size:20px;
  color:var(--cyan);margin:34px 0 12px;
}
h4{font-family:var(--sans);font-weight:700;font-size:16px;color:var(--ink);margin:24px 0 8px;}
p{margin:0 0 18px;}
a{color:var(--cyan);text-decoration:none;border-bottom:1px solid rgba(63,208,201,.35);}
a:hover{border-bottom-color:var(--cyan);}
strong{color:#fff;font-weight:700;}
em{color:var(--ink);}
ul,ol{margin:0 0 18px;padding-left:26px;}
li{margin:6px 0;}
hr{border:none;border-top:1px solid var(--line);margin:40px 0;}
code{
  font-family:var(--mono);font-size:.86em;
  background:var(--bg-3);color:var(--amber);
  padding:2px 6px;border-radius:4px;border:1px solid var(--line-soft);
}
mark{background:rgba(240,169,59,.22);color:var(--amber);padding:0 3px;border-radius:3px;}

/* ---- the cold open ---- */
.cold-open{
  font-family:var(--serif);font-size:19px;line-height:1.74;
  color:var(--ink);background:linear-gradient(180deg,var(--bg-2),transparent);
  border-left:3px solid var(--amber);border-radius:0 8px 8px 0;
  padding:22px 26px;margin:0 0 36px;
}
.cold-open::before{
  content:"⌖ FIELD NOTE";display:block;
  font-family:var(--mono);font-size:11px;letter-spacing:2px;
  color:var(--amber);margin-bottom:10px;
}
.cold-open p:last-child{margin-bottom:0;}

/* ---- callouts ---- */
.callout{
  position:relative;margin:26px 0;padding:18px 20px 18px 22px;
  border-radius:9px;border:1px solid var(--line);
  background:var(--panel);font-family:var(--sans);font-size:15.5px;line-height:1.62;
}
.callout-label{
  display:flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:1.5px;
  text-transform:uppercase;font-weight:700;margin-bottom:8px;cursor:pointer;
  user-select:none;
}
.callout-label .twirl{
  margin-left:auto;transition:transform .2s;color:var(--ink-faint);font-size:13px;
}
.callout.collapsed .callout-label .twirl{transform:rotate(-90deg);}
.callout.collapsed .callout-body{display:none;}
.callout-body>*:last-child{margin-bottom:0;}
.callout-title{font-family:var(--sans);font-weight:700;color:#fff;}
.callout-concept{border-left:4px solid var(--blue);}
.callout-concept .callout-label{color:var(--blue);}
.callout-note{border-left:4px solid var(--cyan);}
.callout-note .callout-label{color:var(--cyan);}
.callout-pitfall{border-left:4px solid var(--red);}
.callout-pitfall .callout-label{color:var(--red);}
.callout-case{border-left:4px solid var(--amber);background:#16161f;}
.callout-case .callout-label{color:var(--amber);}
.callout-war{border-left:4px solid var(--purple);}
.callout-war .callout-label{color:var(--purple);}
.callout-lab{border-left:4px solid var(--green);background:#0f1a16;}
.callout-lab .callout-label{color:var(--green);}

/* ---- code blocks (Prism — theme-aware) ---- */
pre[class*="language-"],
code[class*="language-"]{color:var(--code-ink);}
pre[class*="language-"]{
  margin:22px 0;padding:16px 18px;border-radius:9px;
  border:1px solid var(--code-border);background:var(--code-bg) !important;
  font-size:13.5px;line-height:1.6;overflow:auto;position:relative;
}
:not(pre)>code[class*="language-"]{background:var(--code-bg);}
pre[class*="language-"] code{background:none;border:none;padding:0;font-size:13.5px;color:inherit;}

/* Prism token palette — dark (default). Overridden for light below. */
.token.comment,.token.block-comment,.token.prolog,.token.doctype,.token.cdata{color:var(--t-comment);}
.token.punctuation{color:var(--t-punct);}
.token.tag,.token.attr-name,.token.namespace,.token.deleted{color:var(--t-tag);}
.token.function-name{color:var(--t-funcname);}
.token.boolean,.token.number,.token.function{color:var(--t-number);}
.token.property,.token.class-name,.token.constant,.token.symbol{color:var(--t-prop);}
.token.selector,.token.important,.token.atrule,.token.keyword,.token.builtin{color:var(--t-keyword);}
.token.string,.token.char,.token.attr-value,.token.regex,.token.variable{color:var(--t-string);}
.token.operator,.token.entity,.token.url{color:var(--t-operator);background:none;}
.token.inserted{color:var(--green);}
.token.bold,.token.important{font-weight:700;}
.token.italic{font-style:italic;}

/* ---- annotated code (hover-to-explain line markers) ---- */
.annotated-code{
  margin:22px 0;padding:14px 16px;border-radius:9px;
  border:1px solid var(--code-border);background:var(--code-bg);
  font-family:var(--mono);font-size:13.5px;line-height:2;
  color:var(--code-ink);overflow:visible;
}
.acode-line{white-space:pre-wrap;overflow-wrap:anywhere;position:relative;}
.acode-mark{
  position:relative;display:inline-flex;align-items:center;justify-content:center;
  width:17px;height:17px;margin-left:7px;vertical-align:middle;
  font-family:var(--sans);font-size:10.5px;font-weight:700;
  color:var(--bg);background:var(--accent);border-radius:50%;
  cursor:help;user-select:none;
}
.acode-mark:hover,.acode-mark:focus{background:var(--amber);outline:none;}
.acode-note{
  display:none;position:absolute;z-index:20;top:25px;right:0;width:300px;
  white-space:normal;text-align:left;
  font-family:var(--sans);font-size:12.5px;line-height:1.55;font-weight:400;
  color:var(--ink);background:var(--panel);
  border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:7px;padding:10px 12px;
  box-shadow:0 10px 28px rgba(0,0,0,.45);
}
.acode-mark:hover .acode-note,.acode-mark:focus .acode-note{display:block;}
.acode-note code{font-family:var(--mono);font-size:11.5px;color:var(--accent);}
.acode-hint{margin:2px 0 22px;font-family:var(--sans);font-size:12px;color:var(--ink-faint);}

.code-wrap{position:relative;}
.copy-btn{
  position:absolute;top:8px;right:8px;z-index:2;
  font-family:var(--mono);font-size:10.5px;letter-spacing:1px;
  background:var(--bg-3);color:var(--ink-dim);border:1px solid var(--line);
  border-radius:5px;padding:4px 9px;cursor:pointer;opacity:0;transition:opacity .15s;
}
.code-wrap:hover .copy-btn{opacity:1;}
.copy-btn:hover{color:var(--cyan);border-color:var(--cyan-deep);}
.copy-btn.done{color:var(--green);border-color:var(--green);}

/* ---- attack-flow (numbered steps) ---- */
.attack-flow{
  margin:26px 0;border:1px solid var(--line);border-radius:9px;
  background:var(--bg-2);overflow:hidden;
}
.attack-flow .af-head{
  font-family:var(--mono);font-size:11px;letter-spacing:1.5px;text-transform:uppercase;
  color:var(--amber);background:#16161f;padding:9px 18px;border-bottom:1px solid var(--line);
}
.attack-flow ol{margin:0;padding:14px 18px 14px 16px;counter-reset:af;list-style:none;}
.attack-flow ol li{
  position:relative;padding:9px 0 9px 44px;margin:0;
  font-family:var(--sans);font-size:15px;border-bottom:1px dashed var(--line-soft);
}
.attack-flow ol li:last-child{border-bottom:none;}
.attack-flow ol li::before{
  counter-increment:af;content:counter(af);
  position:absolute;left:0;top:9px;width:28px;height:28px;
  display:grid;place-items:center;border-radius:50%;
  background:var(--bg-3);border:1.5px solid var(--amber);color:var(--amber);
  font-family:var(--mono);font-size:13px;font-weight:700;
}

/* ---- figures / diagrams ---- */
figure{
  margin:28px 0;padding:18px;background:var(--bg-2);
  border:1px solid var(--line);border-radius:9px;text-align:center;
}
figure img,figure svg,figure object{max-width:100%;height:auto;border-radius:5px;}
figure.screenshot img{border:1px solid var(--line);}
figcaption{
  font-family:var(--sans);font-size:13px;color:var(--ink-dim);
  margin-top:12px;line-height:1.5;text-align:left;
}
figcaption .fig-label{color:var(--cyan);font-family:var(--mono);
  font-size:11px;letter-spacing:1px;text-transform:uppercase;margin-right:8px;}

/* ---- tables ---- */
.tbl-wrap{overflow-x:auto;margin:24px 0;}
table{
  width:100%;border-collapse:collapse;font-family:var(--sans);font-size:14.5px;
  background:var(--bg-2);border:1px solid var(--line);border-radius:8px;overflow:hidden;
}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line-soft);
  vertical-align:top;}
thead th{
  background:#16161f;color:var(--cyan);font-family:var(--mono);
  font-size:12px;letter-spacing:.5px;text-transform:uppercase;
}
tbody tr:last-child td{border-bottom:none;}
tbody tr:hover{background:var(--bg-3);}

/* ---- the six-part lens chips ---- */
.lens-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:24px 0;}
.lens-card{
  background:var(--bg-2);border:1px solid var(--line);border-radius:9px;padding:15px 17px;
}
.lens-card .lens-n{
  font-family:var(--mono);font-size:12px;color:var(--cyan);font-weight:700;
}
.lens-card h4{margin:4px 0 6px;color:#fff;}
.lens-card p{font-family:var(--sans);font-size:13.5px;color:var(--ink-dim);margin:0;}

/* ---- citations ---- */
sup.cite{font-size:.66em;line-height:0;}
sup.cite a{
  color:var(--cyan);border:none;font-family:var(--mono);
  background:rgba(63,208,201,.12);padding:1px 4px;border-radius:3px;
}
sup.cite a:hover{background:rgba(63,208,201,.28);}
/* case tag attached to a citation — superscript, matches [N] but in amber */
sup.case-cite{font-size:.66em;line-height:0;margin-left:2px;}
sup.case-cite a{
  color:var(--amber);border:none;font-family:var(--mono);text-decoration:none;
  background:rgba(240,169,59,.14);padding:1px 4px;border-radius:3px;
}
sup.case-cite a:hover{background:rgba(240,169,59,.32);}
.references{
  margin-top:48px;border-top:1px solid var(--line);padding-top:24px;
  font-family:var(--sans);font-size:13.5px;color:var(--ink-dim);
}
.references h2{font-size:20px;margin-top:0;}
.references ol{padding-left:30px;}
.references li{margin:9px 0;line-height:1.55;}
.references li::marker{color:var(--cyan-deep);font-family:var(--mono);}
.references a{word-break:break-word;}

/* ---- quiz ---- */
.quiz{
  margin:34px 0;border:1px solid var(--line);border-radius:11px;
  background:var(--bg-2);overflow:hidden;
}
.quiz-head{
  font-family:var(--mono);font-size:12px;letter-spacing:1.5px;text-transform:uppercase;
  color:var(--green);background:#0f1a16;padding:12px 20px;border-bottom:1px solid var(--line);
}
.quiz-q{padding:18px 20px;border-bottom:1px solid var(--line-soft);}
.quiz-q:last-of-type{border-bottom:none;}
.quiz-q .q-text{font-family:var(--sans);font-weight:600;font-size:15.5px;margin-bottom:12px;}
.quiz-q .q-text .qn{color:var(--green);font-family:var(--mono);margin-right:8px;}
.quiz-opt{
  display:block;font-family:var(--sans);font-size:14.5px;
  padding:9px 13px;margin:7px 0;border:1px solid var(--line);border-radius:7px;
  cursor:pointer;color:var(--ink-dim);transition:.12s;
}
.quiz-opt:hover{border-color:var(--cyan-deep);color:var(--ink);}
.quiz-opt.correct{border-color:var(--green);background:rgba(70,192,138,.13);color:#fff;}
.quiz-opt.wrong{border-color:var(--red);background:rgba(229,72,77,.13);color:#fff;}
.quiz-opt .mk{font-family:var(--mono);font-size:12px;margin-right:9px;color:var(--ink-faint);}
.quiz-explain{
  margin-top:11px;font-family:var(--sans);font-size:13.5px;line-height:1.55;
  color:var(--ink-dim);background:var(--bg-3);border-radius:7px;padding:11px 14px;
  display:none;border-left:3px solid var(--green);
}
.quiz-explain.show{display:block;}
.quiz-q.short .quiz-reveal{
  font-family:var(--mono);font-size:12px;letter-spacing:1px;
  background:var(--bg-3);color:var(--green);border:1px solid var(--green);
  border-radius:6px;padding:6px 13px;cursor:pointer;
}
.quiz-q.short .quiz-answer{display:none;margin-top:11px;}
.quiz-q.short .quiz-answer.show{display:block;}

/* ---- attacker checklist / defender mirror ---- */
.checklist{
  margin:24px 0;padding:18px 20px;border-radius:9px;
  background:var(--bg-2);border:1px solid var(--line);
}
.checklist .cl-head{
  font-family:var(--mono);font-size:11.5px;letter-spacing:1.5px;text-transform:uppercase;
  color:var(--amber);margin-bottom:10px;
}
.checklist.defender .cl-head{color:var(--green);}
.checklist ul{list-style:none;padding:0;margin:0;}
.checklist li{
  font-family:var(--sans);font-size:14.5px;padding:6px 0 6px 26px;position:relative;
}
.checklist li::before{
  content:"▸";position:absolute;left:4px;color:var(--amber);
}
.checklist.defender li::before{content:"✓";color:var(--green);}

/* ---- key-takeaways box ---- */
.takeaways{
  margin:30px 0;border:1px dashed var(--cyan-deep);border-radius:10px;
  background:linear-gradient(180deg,rgba(63,208,201,.06),transparent);
  padding:18px 22px;
}
.takeaways .tk-head{
  font-family:var(--mono);font-size:11.5px;letter-spacing:1.5px;text-transform:uppercase;
  color:var(--cyan);margin-bottom:8px;
}

/* ---- footer prev/next ---- */
footer.chapter-nav{
  margin-left:var(--sidebar-w);border-top:1px solid var(--line);
  background:var(--bg-2);padding:26px 40px;display:flex;justify-content:space-between;gap:20px;
}
footer.chapter-nav a{
  display:block;border:1px solid var(--line);border-radius:9px;padding:13px 18px;
  font-family:var(--sans);max-width:46%;background:var(--bg-3);
}
footer.chapter-nav a:hover{border-color:var(--cyan-deep);}
footer.chapter-nav .fn-dir{
  font-family:var(--mono);font-size:11px;letter-spacing:1.5px;text-transform:uppercase;
  color:var(--ink-faint);
}
footer.chapter-nav .fn-title{color:var(--ink);font-weight:600;font-size:15px;margin-top:3px;}
footer.chapter-nav a.next{text-align:right;margin-left:auto;}

/* ======================= HOME / INDEX PAGE ======================= */
.hero{
  text-align:center;padding:30px 0 16px;border-bottom:1px solid var(--line);margin-bottom:36px;
}
.hero img.banner{max-width:100%;border-radius:12px;margin-bottom:24px;}
.hero h1{
  font-family:var(--sans);font-weight:800;font-size:46px;line-height:1.1;
  color:#fff;margin:6px 0 10px;letter-spacing:-.5px;
}
.hero .sub{font-family:var(--sans);font-size:18px;color:var(--ink-dim);max-width:620px;
  margin:0 auto 18px;}
.hero .pills{display:flex;gap:9px;justify-content:center;flex-wrap:wrap;}
.hero .pill{
  font-family:var(--mono);font-size:11.5px;color:var(--cyan);
  border:1px solid var(--line);border-radius:20px;padding:4px 12px;
}
.thesis{
  background:var(--panel);border:1px solid var(--line);border-left:4px solid var(--red);
  border-radius:10px;padding:20px 24px;margin:28px 0;font-family:var(--sans);font-size:16px;
}
.thesis .th-label{
  font-family:var(--mono);font-size:11.5px;letter-spacing:1.5px;text-transform:uppercase;
  color:var(--red);margin-bottom:8px;
}
.toc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:24px 0;}
.toc-card{
  display:block;background:var(--bg-2);border:1px solid var(--line);border-radius:10px;
  padding:16px 18px;text-decoration:none;border-bottom:1px solid var(--line);
}
.toc-card:hover{border-color:var(--cyan-deep);background:var(--bg-3);}
.toc-card .tc-num{
  font-family:var(--mono);font-size:12px;color:var(--cyan);font-weight:700;
}
.toc-card .tc-title{
  font-family:var(--sans);font-weight:700;font-size:16.5px;color:#fff;margin:4px 0 6px;
}
.toc-card .tc-desc{font-family:var(--sans);font-size:13px;color:var(--ink-dim);line-height:1.5;}
.toc-card .tc-part{
  font-family:var(--mono);font-size:10px;letter-spacing:1px;text-transform:uppercase;
  color:var(--amber);
}

html[data-theme="light"] .lens-card h4{color:#0c1119;}

/* ---- right-side in-page TOC (auto-built by book.js) ---- */
nav.toc-right{
  position:fixed;top:54px;right:0;bottom:0;width:var(--toc-w);z-index:30;
  overflow-y:auto;padding:26px 18px 60px;border-left:1px solid var(--line);
  background:var(--bg);
}
nav.toc-right .toc-head{
  font-family:var(--mono);font-size:10.5px;letter-spacing:1.5px;
  text-transform:uppercase;color:var(--ink-faint);margin-bottom:12px;
}
nav.toc-right a{
  display:block;text-decoration:none;border:none;
  font-family:var(--sans);font-size:12.5px;line-height:1.4;
  color:var(--ink-faint);padding:5px 10px;border-left:2px solid var(--line-soft);
}
nav.toc-right a.lvl-3{padding-left:22px;font-size:12px;}
nav.toc-right a:hover{color:var(--ink);}
nav.toc-right a.active{color:var(--cyan);border-left-color:var(--cyan);
  background:linear-gradient(90deg,rgba(63,208,201,.10),transparent);}

/* ---- responsive ---- */
@media(min-width:1281px){
  main{margin-right:var(--toc-w);}
}
@media(max-width:1280px){
  nav.toc-right{display:none;}
}
@media(max-width:1080px){
  :root{--sidebar-w:0px;}
  nav.sidebar{
    transform:translateX(-100%);transition:transform .2s;width:288px;
    box-shadow:0 0 40px rgba(0,0,0,.6);
  }
  nav.sidebar.open{transform:translateX(0);}
  #menu-toggle{display:block;}
  main{margin-left:0;}
  footer.chapter-nav{margin-left:0;}
  .toc-grid,.lens-grid{grid-template-columns:1fr;}
}
@media(max-width:680px){
  body{font-size:17px;}
  .chapter,.home{padding:0 20px;}
  h1.chapter-title{font-size:32px;}
  .hero h1{font-size:34px;}
  h2{font-size:23px;}
  footer.chapter-nav{flex-direction:column;}
  footer.chapter-nav a{max-width:100%;}
}

/* ========================================================================
   Top navbar tabs (Textbook / Case Studies)
   ======================================================================== */
header.topbar .topnav{display:flex;gap:5px;}
header.topbar .topnav-tab{
  font-family:var(--mono);font-size:12.5px;font-weight:600;letter-spacing:.3px;
  color:var(--ink-dim);text-decoration:none;
  border:1px solid transparent;border-radius:7px;
  padding:6px 14px;line-height:1;white-space:nowrap;
  transition:color .12s,background .12s,border-color .12s;
}
header.topbar .topnav-tab:hover{color:var(--ink);background:var(--bg-3);}
header.topbar .topnav-tab.active{
  color:var(--cyan);border-color:var(--cyan-deep);
  background:linear-gradient(180deg,rgba(63,208,201,.14),transparent);
}
@media(max-width:680px){
  /* tighten the bar and drop the chapter/ACSP pills so the tabs + theme
     toggle always fit on screen */
  header.topbar{padding:0 12px;gap:8px;}
  header.topbar .tag{display:none;}
  /* collapse the brand wordmark to just the logo glyph */
  header.topbar .brand{font-size:0;gap:0;}
  header.topbar .brand .logo{font-size:13px;}
  header.topbar .topnav{gap:4px;}
  header.topbar .topnav-tab{padding:6px 10px;font-size:12px;}
}
@media(max-width:420px){
  header.topbar{gap:6px;}
  header.topbar .topnav-tab{padding:5px 8px;font-size:11px;letter-spacing:0;}
}

/* ========================================================================
   In-text case references — #NNN tags linking to the Case Studies table
   ======================================================================== */
.case-ref{
  font-family:var(--mono);font-size:.82em;font-weight:600;
  color:var(--amber);background:rgba(240,169,59,.12);
  border:1px solid rgba(240,169,59,.34);border-radius:5px;
  padding:.5px 5px .5px 4px;white-space:nowrap;text-decoration:none;
  transition:background .12s,border-color .12s,color .12s;
}
.case-ref::before{content:"\25C8";margin-right:3px;font-size:.8em;opacity:.75;}
.case-ref:hover{
  background:rgba(240,169,59,.26);border-color:var(--amber);color:var(--amber);
}
html[data-theme="light"] .case-ref{background:rgba(176,112,10,.1);}

/* ========================================================================
   Case Studies page
   ======================================================================== */
body.page-cases main{margin-left:0;margin-right:0;padding-top:54px;}
.cs{width:100%;max-width:1280px;padding:0 32px;}
.cs-head{margin-bottom:18px;}
.cs-head h1{
  font-family:var(--sans);font-weight:800;font-size:34px;line-height:1.12;
  color:#fff;letter-spacing:-.5px;margin:0 0 8px;
}
html[data-theme="light"] .cs-head h1{color:#0c1119;}
.cs-head .cs-sub{
  font-family:var(--sans);font-size:15px;color:var(--ink-dim);margin:0;
}

/* --- sticky filter toolbar --- */
.cs-toolbar{
  position:sticky;top:54px;z-index:30;
  background:var(--header-bg);backdrop-filter:blur(8px);
  display:flex;flex-wrap:wrap;gap:12px 14px;align-items:flex-end;
  padding:14px 0 13px;margin-bottom:2px;
  border-bottom:1px solid var(--line);
}
.cs-field{display:flex;flex-direction:column;gap:5px;}
.cs-field label{
  font-family:var(--mono);font-size:10px;letter-spacing:1.3px;
  text-transform:uppercase;color:var(--ink-faint);
}
.cs-field select,.cs-field input{
  background:var(--bg-3);border:1px solid var(--line);color:var(--ink);
  font-family:var(--sans);font-size:13px;border-radius:7px;
  padding:7px 10px;min-width:158px;outline:none;
}
.cs-field select:focus,.cs-field input:focus{border-color:var(--cyan-deep);}
.cs-field.cs-search{flex:1 1 220px;}
.cs-field.cs-search input{width:100%;min-width:0;}
.cs-reset{
  background:var(--bg-3);border:1px solid var(--line);color:var(--ink-dim);
  font-family:var(--mono);font-size:12px;font-weight:600;cursor:pointer;
  border-radius:7px;padding:8px 13px;line-height:1;
}
.cs-reset:hover{color:var(--red);border-color:var(--red-dim);}
.cs-count{
  font-family:var(--mono);font-size:12px;color:var(--ink-faint);
  margin:14px 0 10px;
}
.cs-count b{color:var(--cyan);}

/* --- the data table --- */
.cs-table-wrap{overflow-x:auto;margin:0 0 60px;
  border:1px solid var(--line);border-radius:8px;}
table.cs-table{border:none;border-radius:0;font-size:13.5px;margin:0;}
table.cs-table th,table.cs-table td{padding:9px 13px;}
table.cs-table thead th{
  cursor:pointer;user-select:none;white-space:nowrap;position:relative;
}
table.cs-table thead th:hover{color:#fff;}
html[data-theme="light"] table.cs-table thead th:hover{color:#0c1119;}
table.cs-table thead th .cs-arrow{opacity:.4;margin-left:5px;font-size:10px;}
table.cs-table thead th.cs-sorted .cs-arrow{opacity:1;color:var(--amber);}
table.cs-table td.cs-case{
  font-family:var(--mono);font-size:12px;font-weight:600;
  color:var(--amber);white-space:nowrap;
}
table.cs-table td.cs-title{font-weight:600;color:var(--ink);min-width:280px;}
table.cs-table td.cs-title a{color:var(--ink);border-bottom:1px solid var(--line);}
table.cs-table td.cs-title a:hover{color:var(--cyan);border-bottom-color:var(--cyan);}
table.cs-table td .cs-ext{font-family:var(--mono);font-size:10px;color:var(--ink-faint);}
.cs-pill{
  font-family:var(--mono);font-size:11px;white-space:nowrap;
  border:1px solid var(--line);border-radius:20px;padding:2px 9px;
  color:var(--ink-dim);background:var(--bg-3);
}
table.cs-table td.cs-date{font-family:var(--mono);font-size:12px;color:var(--ink-faint);
  white-space:nowrap;}
.cs-empty{padding:40px;text-align:center;color:var(--ink-faint);
  font-family:var(--sans);font-size:15px;}

/* --- deep-link target highlight --- */
/* #case-NNN scroll target clears the fixed topbar + sticky filter toolbar;
   the exact height is measured and set as --cs-scroll-margin by the JS. */
table.cs-table tbody tr{scroll-margin-top:var(--cs-scroll-margin,150px);}
table.cs-table tbody tr.cs-flash{animation:cs-flash 2.6s ease-out;}
table.cs-table tbody tr.cs-flash td:first-child{
  box-shadow:inset 3px 0 0 var(--amber);
}
@keyframes cs-flash{
  0%,22%{background:rgba(240,169,59,.28);}
  100%{background:transparent;}
}

@media(max-width:680px){
  .cs{padding:0 16px;}
  .cs-head h1{font-size:27px;}
  .cs-field select,.cs-field input{min-width:130px;}
}