/* NERvE Security Academy. Layout: sticky top bar, content column, bottom tab bar on phones.
   Palette: deep cobalt accent, signal amber highlight, cool slate neutrals. */
/* NERvE Security Academy design system.
   Signature: deep navy command sidebar, indigo signal accent, amber for achievement.
   Layout: fixed sidebar (desktop) + content column; top bar + bottom tabs (phone). */
:root{
  --bg:#f3f5f9;--surface:#fff;--surface-2:#f8f9fc;--ink:#0d1526;--muted:#566176;--line:#e1e6ef;
  --accent:#3550f0;--accent-2:#eaeefe;--accent-ink:#fff;--hi:#b36b00;--hi-bg:#fff4de;
  --ok:#11795a;--ok-bg:#e2f5ee;--crit:#c0262d;--crit-bg:#fdecec;--code-bg:#eef1f7;
  --nav:#0a1430;--nav-2:#121f45;--nav-ink:#c9d3ee;--nav-dim:#7d8ab0;
  --display:"Archivo","Arial Narrow",system-ui,sans-serif;
  --body:"Instrument Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --radius:14px;--shadow:0 1px 2px rgba(13,21,38,.05),0 4px 16px rgba(13,21,38,.05);color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0a0f1d;--surface:#121a2c;--surface-2:#172036;--ink:#e6eaf3;--muted:#98a3b9;--line:#253049;
  --accent:#8aa0ff;--accent-2:#1c2647;--accent-ink:#0a0f1d;--hi:#f3b64e;--hi-bg:#33280f;
  --ok:#4fd1a1;--ok-bg:#102b23;--crit:#ff8a85;--crit-bg:#3a1818;--code-bg:#0e1525;
  --nav:#070c1a;--nav-2:#0f1830;--shadow:none;color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0a0f1d;--surface:#121a2c;--surface-2:#172036;--ink:#e6eaf3;--muted:#98a3b9;--line:#253049;
  --accent:#8aa0ff;--accent-2:#1c2647;--accent-ink:#0a0f1d;--hi:#f3b64e;--hi-bg:#33280f;
  --ok:#4fd1a1;--ok-bg:#102b23;--crit:#ff8a85;--crit-bg:#3a1818;--code-bg:#0e1525;
  --nav:#070c1a;--nav-2:#0f1830;--shadow:none;color-scheme:dark}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:16px/1.55 var(--body);padding-bottom:76px;-webkit-font-smoothing:antialiased}
a{color:var(--accent)}
h1,h2,h3,h4{font-family:var(--display);text-wrap:balance;line-height:1.12;margin:0;letter-spacing:-.01em}
h1{font-size:clamp(1.65rem,3.6vw,2.3rem);font-weight:800}h2{font-size:1.35rem;font-weight:700}h3{font-size:1.08rem;font-weight:700}h4{font-size:.98rem;margin:12px 0 4px}
code,pre{font-family:var(--mono);font-size:.84rem}
pre{background:var(--code-bg);border:1px solid var(--line);border-radius:8px;padding:12px;overflow-x:auto;margin:8px 0;white-space:pre-wrap;word-break:break-word}
code.wrap{word-break:break-all}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
/* App shell */
.side{display:none}
@media(min-width:1024px){
  body.app{display:grid;grid-template-columns:264px minmax(0,1fr);padding-bottom:0}
  .side{display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow-y:auto;background:var(--nav);color:var(--nav-ink);padding:18px 14px}
  .main-col{min-width:0;display:flex;flex-direction:column;min-height:100vh}
}
.side .brand{color:#fff;padding:4px 8px 18px}
.side .brand small{color:var(--nav-dim)}
.side .grp{font:600 .7rem var(--body);letter-spacing:.12em;text-transform:uppercase;color:var(--nav-dim);margin:16px 10px 6px}
.side a.nv{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:9px;color:var(--nav-ink);text-decoration:none;font-size:.93rem;font-weight:500}
.side a.nv:hover{background:var(--nav-2);color:#fff}
.side a.nv[aria-current="page"]{background:linear-gradient(90deg,rgba(91,118,255,.28),rgba(91,118,255,.08));color:#fff;box-shadow:inset 3px 0 0 #7d93ff}
.side a.nv .i{width:20px;text-align:center;opacity:.9}
.side .ri{margin-top:auto;background:var(--nav-2);border:1px solid rgba(255,255,255,.06);border-radius:12px;padding:12px;color:#fff}
.side .ri .lab{font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--nav-dim)}
.side .ri .v{font:800 1.7rem/1 var(--display);font-variant-numeric:tabular-nums}
.side .ri .meter{background:rgba(255,255,255,.1)}
header.top{background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.bar{display:flex;align-items:center;gap:12px;padding-top:10px;padding-bottom:10px;min-height:60px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,#3550f0,#7b5cff);color:#fff;display:grid;place-items:center;font:800 1.05rem var(--display);box-shadow:0 4px 14px rgba(53,80,240,.35)}
.brand b{font:800 1.15rem/1 var(--display);letter-spacing:.01em}.brand small{display:block;font-size:.66rem;color:var(--muted);letter-spacing:.14em;text-transform:uppercase;margin-top:2px}
.brand .v{color:#7d93ff}
@media(min-width:1024px){header.top .brand{display:none}}
.crumbtitle{font:600 .95rem var(--body);color:var(--muted)}
@media(max-width:1023px){.crumbtitle{display:none}}
.iconbtn{background:var(--surface);border:1px solid var(--line);color:var(--ink);border-radius:9px;width:38px;height:38px;display:grid;place-items:center;cursor:pointer;font-size:1rem}
.bar .tools-right{display:flex;gap:6px;margin-left:auto;align-items:center}
.xpchip{display:flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:4px 12px 4px 4px;text-decoration:none;color:var(--ink);font-size:.84rem;font-weight:600;white-space:nowrap}
.xpchip .lv{background:var(--hi-bg);color:var(--hi);border-radius:999px;padding:2px 9px;font-variant-numeric:tabular-nums}
nav.bottom{position:fixed;bottom:0;left:0;right:0;background:var(--surface);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(5,1fr);z-index:20;padding-bottom:env(safe-area-inset-bottom)}
nav.bottom a,nav.bottom button{display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 2px;text-decoration:none;color:var(--muted);font:500 .72rem var(--body);background:none;border:0;cursor:pointer}
nav.bottom .ico{font-size:1.2rem;line-height:1}
nav.bottom [aria-current="page"]{color:var(--accent);font-weight:700}
@media(min-width:1024px){nav.bottom{display:none}}
.sheet{position:fixed;inset:0;background:rgba(5,10,20,.5);z-index:30;display:flex;align-items:flex-end}
.sheet .panel{background:var(--surface);width:100%;border-radius:18px 18px 0 0;padding:16px 16px calc(20px + env(safe-area-inset-bottom));display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.sheet .panel a{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 4px;border:1px solid var(--line);border-radius:12px;text-decoration:none;color:var(--ink);font-size:.8rem;text-align:center}
.sheet .panel a span{font-size:1.35rem}
main{padding:26px 0 56px;width:100%}
/* Building blocks */
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.grid.tight{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;display:flex;flex-direction:column;gap:8px;min-width:0}
.card.link{cursor:pointer;text-decoration:none;color:inherit;transition:border-color .15s,transform .15s}
.card.link:hover{border-color:var(--accent);transform:translateY(-1px)}
.card.accent{background:var(--accent-2);border-color:transparent}
.muted{color:var(--muted)}.small{font-size:.86rem}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.between{justify-content:space-between}
.stack{display:flex;flex-direction:column;gap:14px}
.section{margin:28px 0 12px}
.pill{display:inline-block;padding:2px 9px;border-radius:999px;font-size:.74rem;font-weight:600;border:1px solid var(--line);color:var(--muted);white-space:nowrap}
.pill.crit{background:var(--crit-bg);color:var(--crit);border-color:transparent}
.pill.high{background:var(--hi-bg);color:var(--hi);border-color:transparent}
.pill.ok{background:var(--ok-bg);color:var(--ok);border-color:transparent}
.pill.acc{background:var(--accent-2);color:var(--accent);border-color:transparent}
.pill.kev{background:var(--crit);color:#fff;border-color:transparent}
.meter{height:6px;background:var(--line);border-radius:4px;overflow:hidden}
.meter.big{height:10px}
.meter i{display:block;height:100%;background:var(--accent);border-radius:4px;transition:width .3s}
.meter i.m-crit{background:var(--crit)}.meter i.m-high{background:var(--hi)}.meter i.m-ok{background:var(--ok)}
.btn{font:inherit;font-weight:600;border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink);padding:9px 15px;border-radius:9px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:6px;line-height:1.2}
.btn.ghost{background:transparent;color:var(--accent)}
.btn.sm{padding:5px 10px;font-size:.85rem}
.btn:disabled{opacity:.5;cursor:default}
.stat{font-family:var(--display);font-size:2rem;font-variant-numeric:tabular-nums;line-height:1}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px}
.tile{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px}
.tile .lab{font-size:.78rem;color:var(--muted)}
.hero{display:grid;gap:14px;grid-template-columns:1.5fr 1fr;align-items:stretch}
@media(max-width:820px){.hero{grid-template-columns:1fr}}
.sevbar{border-left:4px solid var(--line)}
.sevbar.critical{border-left-color:var(--crit)}.sevbar.high{border-left-color:var(--hi)}.sevbar.medium{border-left-color:var(--accent)}
.lesson{max-width:76ch}
.lesson p{margin:.5em 0}.lesson ul{padding-left:1.2em;margin:.4em 0}.lesson li{margin:.2em 0}
.subtabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:16px 0;overflow-x:auto;scrollbar-width:none}
.subtabs button{font:inherit;background:none;border:0;border-bottom:3px solid transparent;padding:9px 10px;color:var(--muted);cursor:pointer;font-weight:600;white-space:nowrap}
.subtabs button[aria-selected="true"]{color:var(--ink);border-color:var(--accent)}
.opt{display:block;width:100%;text-align:left;font:inherit;background:var(--surface);border:1px solid var(--line);border-radius:9px;padding:11px 13px;margin:6px 0;cursor:pointer;color:var(--ink)}
.opt:hover:not(:disabled){border-color:var(--accent)}
.opt.right{border-color:var(--ok);background:var(--ok-bg)}
.opt.wrong{border-color:var(--crit);background:var(--crit-bg)}
.opt.picked{border-color:var(--accent);background:var(--accent-2)}
.steps{counter-reset:s;list-style:none;padding:0;margin:8px 0}
.steps li{counter-increment:s;position:relative;padding:4px 0 10px 38px}
.steps li::before{content:counter(s);position:absolute;left:0;top:3px;width:26px;height:26px;border-radius:50%;background:var(--accent);color:var(--accent-ink);font-size:.8rem;display:grid;place-items:center;font-weight:700}
.steps li.done{color:var(--muted);text-decoration:line-through}
.note{background:var(--hi-bg);border-radius:9px;padding:10px 12px;font-size:.9rem}
label{font-size:.88rem;font-weight:500;display:block;margin:8px 0 4px}
label:has(input[type=checkbox]),label:has(input[type=radio]){display:inline-flex;gap:6px;align-items:center;margin:4px 10px 4px 0;font-weight:400}
textarea,input[type=text],input[type=number],input[type=password],input[type=search],select{font:inherit;width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink)}
textarea{font-family:var(--mono);font-size:.85rem}
input[type=range]{width:100%;accent-color:var(--accent)}
.formgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:4px 12px}
.tool-out{margin-top:10px}
.tool-out table{margin:6px 0}
table{border-collapse:collapse;width:100%;font-size:.9rem}
th,td{text-align:left;padding:7px 8px;border-bottom:1px solid var(--line);vertical-align:top}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
.tablewrap{overflow-x:auto}
.chat{display:flex;flex-direction:column;gap:10px;max-height:52vh;overflow-y:auto;padding:2px}
.msg{padding:10px 12px;border-radius:12px;max-width:88%;white-space:pre-wrap}
.msg.me{align-self:flex-end;background:var(--accent);color:var(--accent-ink);border-bottom-right-radius:4px}
.msg.ai{align-self:flex-start;background:var(--surface-2);border:1px solid var(--line);border-bottom-left-radius:4px}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chips button{font:inherit;font-size:.84rem;padding:5px 11px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--muted);cursor:pointer}
.chips button[aria-pressed="true"]{border-color:var(--accent);color:var(--accent);font-weight:600;background:var(--accent-2)}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:999px;font-weight:600;z-index:50;box-shadow:0 6px 24px rgba(0,0,0,.25);animation:pop .25s ease-out}
@media(min-width:900px){.toast{bottom:28px}}
@keyframes pop{from{transform:translate(-50%,10px);opacity:0}to{transform:translate(-50%,0);opacity:1}}
.badge{display:flex;flex-direction:column;align-items:center;text-align:center;gap:4px;padding:12px 8px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
.badge .em{font-size:1.8rem;line-height:1}
.badge.locked{opacity:.4;filter:grayscale(1)}
.flash{min-height:200px;perspective:900px;cursor:pointer}
.flash .inner{position:relative;width:100%;min-height:200px;transition:transform .45s;transform-style:preserve-3d}
.flash.flipped .inner{transform:rotateY(180deg)}
.flash .face{position:absolute;inset:0;backface-visibility:hidden;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);display:flex;flex-direction:column;justify-content:center;align-items:center;padding:22px;text-align:center}
.flash .back{transform:rotateY(180deg);background:var(--accent-2)}
.flash .face h2{font-size:1.5rem}
.email{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);overflow:hidden}
.email .hd{padding:12px 14px;border-bottom:1px solid var(--line);background:var(--surface-2);font-size:.88rem}
.email .bd{padding:14px;white-space:pre-wrap}
.logline{display:block;width:100%;text-align:left;font:13px/1.45 var(--mono);background:var(--code-bg);border:1px solid var(--line);border-radius:6px;padding:7px 9px;margin:4px 0;cursor:pointer;color:var(--ink);word-break:break-all}
.logline:hover:not(:disabled){border-color:var(--accent)}
.logline.right{border-color:var(--ok);background:var(--ok-bg)}.logline.wrong{border-color:var(--crit);background:var(--crit-bg)}
.attack-tactic{border-left:4px solid var(--accent);padding-left:10px}
details{border:1px solid var(--line);border-radius:9px;padding:9px 12px;background:var(--surface)}
details+details{margin-top:6px}
summary{cursor:pointer;font-weight:600}
.searchbox{position:fixed;inset:0;z-index:40;background:rgba(5,10,20,.5);display:flex;justify-content:center;align-items:flex-start;padding:60px 12px}
.searchbox .panel{background:var(--surface);border-radius:14px;width:min(680px,100%);max-height:80vh;display:flex;flex-direction:column;overflow:hidden}
.searchbox .res{overflow-y:auto;padding:8px}
.searchbox .res a{display:block;padding:9px 10px;border-radius:8px;text-decoration:none;color:var(--ink)}
.searchbox .res a:hover,.searchbox .res a:focus{background:var(--accent-2)}
.timer{font:600 1.1rem var(--mono);font-variant-numeric:tabular-nums}
.crumbs{font-size:.86rem;margin-bottom:6px}
.empty{padding:20px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:var(--radius)}
.toolhead{display:flex;gap:12px;align-items:center}.toolhead .em{font-size:1.8rem}
.daily .opt{padding:9px 12px}
footer.site{border-top:1px solid var(--line);padding:18px 0;color:var(--muted);font-size:.82rem}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

@media(max-width:440px){.xpchip .xpn{display:none}.xpchip{padding:4px}.brand small{font-size:.62rem}.bar{gap:8px}}
.card>.btn,.card>button.btn,.card>.row>.btn{align-self:flex-start}

/* ---- Corporate components ---- */
.eyebrow{font:600 .72rem var(--body);letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
.hero-app{background:radial-gradient(1200px 300px at 90% -40%,rgba(123,92,255,.35),transparent),linear-gradient(135deg,#0a1430,#16245a);color:#fff;border-radius:18px;padding:26px;display:grid;gap:20px;grid-template-columns:1.3fr 1fr;align-items:center;border:0}
.hero-app h1{color:#fff}.hero-app p{color:#c9d3ee}
.hero-app .btn.ghost{color:#fff;border-color:rgba(255,255,255,.4)}
@media(max-width:860px){.hero-app{grid-template-columns:1fr;padding:20px}}
.gauge{display:flex;gap:18px;align-items:center;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:14px;padding:16px}
.gauge svg text{fill:#fff}
.band{display:inline-block;font:700 .72rem var(--body);letter-spacing:.08em;text-transform:uppercase;padding:3px 9px;border-radius:999px;background:rgba(255,255,255,.12);color:#fff}
.radar text{fill:var(--muted);font:600 11px var(--body)}
.kpi .stat{font-size:1.9rem}
.kpi .delta{font-size:.78rem;color:var(--muted)}
.aud{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.aud button{font:inherit;text-align:left;display:flex;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--surface);cursor:pointer;color:var(--ink)}
.aud button:hover,.aud button[aria-pressed="true"]{border-color:var(--accent);background:var(--accent-2)}
.aud .em{font-size:1.6rem}
.demo-flag{display:inline-flex;gap:6px;align-items:center;background:var(--hi-bg);color:var(--hi);font:700 .75rem var(--body);padding:4px 10px;border-radius:999px;letter-spacing:.04em}
.bars .b{display:grid;grid-template-columns:130px 1fr 44px;gap:10px;align-items:center;font-size:.86rem;margin:6px 0}
.bars .b .meter{height:8px}
.modal{position:fixed;inset:0;z-index:45;background:rgba(5,10,24,.6);display:flex;align-items:center;justify-content:center;padding:16px}
.modal .panel{background:var(--surface);border-radius:18px;max-width:640px;width:100%;padding:22px;max-height:90vh;overflow:auto}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:10px;margin:30px 0 12px;flex-wrap:wrap}
.section-head p{margin:2px 0 0;color:var(--muted);font-size:.9rem}
.gauge svg{flex-shrink:0;width:140px;height:130px}