/* Agent Engine Academy: MongoDB product look (LeafyGreen / VIA tokens, as used by the Atlas Agent Engine docs and console).
   Layout: app bar with the official MongoDB logo, a learner strip, a "session trace" rail of modules on the left and
   the active module's workspace on the right. Light tokens on :root; dark tokens in the two blocks below (System = OS). */
:root{
  color-scheme:light;
  /* surfaces */
  --bg:#FFFFFF; --surface:#FFFFFF; --sunk:#F9FBFA; --header-bg:#FFFFFF; --input-bg:#FFFFFF;
  /* text */
  --ink:#001E2B; --muted:#3D4F58; --subtle:#5C6C75; --h-ink:#00684A;
  /* lines */
  --line:#E8EDEB; --line-strong:#C1C7C6; --line-control:#889397;
  /* brand / accent */
  --accent:#00684A; --accent-hover:#00593F; --accent-border:#00684A; --on-accent:#FFFFFF; --accent-ink:#00684A;
  --accent-soft:#E3FCF7; --accent-soft-ink:#00684A; --accent-soft-line:#C0FAE6; --accent-ring:#C0FAE6; --brand-leaf:#00ED64;
  /* status: bg / ink / line (+ strong ink for text on tinted banners) */
  --success-bg:#E3FCF7; --success-ink:#00684A; --success-line:#00A35C;
  --warn-bg:#FEF7DB;    --warn-ink:#944F01;    --warn-line:#FFC010; --warn-soft-line:#FFEC9E;
  --error-bg:#FFEAE5;   --error-ink:#DB3030;   --error-line:#DB3030; --error-strong:#970606;
  --info-bg:#E1F7FF;    --info-ink:#1254B7;    --info-line:#016BF8;
  /* chips (LG Badge lightgray) */
  --chip-bg:#F9FBFA; --chip-line:#E8EDEB; --chip-ink:#5C6C75;
  /* buttons (LG default) */
  --btn-bg:#F9FBFA; --btn-ink:#001E2B; --btn-line:#889397; --btn-hover-bg:#FFFFFF; --copy-bg:#FFFFFF;
  /* code (LG Code) */
  --code-bg:#F9FBFA; --code-line:#E8EDEB; --code-ink:#001E2B; --code-inline-ink:#1C2D38;
  /* interaction */
  --link:#0163E4; --focus:#016BF8;
  --focus-ring:0 0 0 2px #FFFFFF, 0 0 0 4px #016BF8; --focus-ring-input:0 0 0 3px #016BF8;
  --hover-ring:0 0 0 3px #E8EDEB; --hover-bg:rgb(0 30 43 / .06); --selection:#C3E7FE;
  /* elevation */
  --shadow-1:0 2px 4px 1px rgb(0 30 43 / .15); --shadow-card:0 4px 10px -4px rgb(0 30 43 / .30);
  --shadow-2:0 18px 18px -15px rgb(0 30 43 / .20); --shadow-3:0 8px 20px -8px rgb(0 30 43 / .60);
  /* badge hexes: fill (white label on it) / outline ring */
  --b0:#00684A; --b1:#1254B7; --b2:#5E0C9E; --b3:#970606; --b4:#023430; --b5:#944F01; --b6:#083C90; --b7:#3D4F58; --b8:#016BF8;
  /* type: brand fonts first (installed on MongoDB laptops), Google Fonts fallbacks after */
  --font-sans:"Euclid Circular A", Lexend, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif:"MongoDB Value Serif", "Source Serif 4", "Times New Roman", serif;
  --font-mono:"Source Code Pro", Menlo, ui-monospace, monospace;
  --r:12px;
}
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){
  color-scheme:dark;
  --bg:#001E2B; --surface:#112733; --sunk:#001E2B; --header-bg:#001E2B; --input-bg:#001E2B;
  --ink:#F9FBFA; --muted:#C1C7C6; --subtle:#889397; --h-ink:#E8EDEB;
  --line:#3D4F58; --line-strong:#5C6C75; --line-control:#889397;
  --accent:#00684A; --accent-hover:#00593F; --accent-border:#00ED64; --on-accent:#FFFFFF; --accent-ink:#00ED64;
  --accent-soft:#023430; --accent-soft-ink:#C0FAE6; --accent-soft-line:#00684A; --accent-ring:#023430; --brand-leaf:#00ED64;
  --success-bg:#023430; --success-ink:#C0FAE6; --success-line:#00A35C;
  --warn-bg:#4C2100;    --warn-ink:#FFC010;    --warn-line:#944F01; --warn-soft-line:#944F01;
  --error-bg:#5B0000;   --error-ink:#FF6960;   --error-line:#FF6960; --error-strong:#FFCDC7;
  --info-bg:#0C2657;    --info-ink:#C3E7FE;    --info-line:#0498EC;
  --chip-bg:#1C2D38; --chip-line:#3D4F58; --chip-ink:#C1C7C6;
  --btn-bg:#3D4F58; --btn-ink:#FFFFFF; --btn-line:#889397; --btn-hover-bg:#5C6C75; --copy-bg:#3D4F58;
  --code-bg:#001E2B; --code-line:#3D4F58; --code-ink:#E8EDEB; --code-inline-ink:#C1C7C6;
  --link:#04A1FB; --focus:#0498EC;
  --focus-ring:0 0 0 2px #001E2B, 0 0 0 4px #0498EC; --focus-ring-input:0 0 0 3px #0498EC;
  --hover-ring:0 0 0 3px #3D4F58; --hover-bg:rgb(255 255 255 / .07); --selection:#083C90;
  --shadow-1:none; --shadow-card:0 4px 20px -4px rgb(0 0 0 / .45);
  --shadow-2:0 18px 18px -15px rgb(0 0 0 / .45); --shadow-3:0 8px 20px -8px rgb(0 0 0 / .60);
}}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#001E2B; --surface:#112733; --sunk:#001E2B; --header-bg:#001E2B; --input-bg:#001E2B;
  --ink:#F9FBFA; --muted:#C1C7C6; --subtle:#889397; --h-ink:#E8EDEB;
  --line:#3D4F58; --line-strong:#5C6C75; --line-control:#889397;
  --accent:#00684A; --accent-hover:#00593F; --accent-border:#00ED64; --on-accent:#FFFFFF; --accent-ink:#00ED64;
  --accent-soft:#023430; --accent-soft-ink:#C0FAE6; --accent-soft-line:#00684A; --accent-ring:#023430; --brand-leaf:#00ED64;
  --success-bg:#023430; --success-ink:#C0FAE6; --success-line:#00A35C;
  --warn-bg:#4C2100;    --warn-ink:#FFC010;    --warn-line:#944F01; --warn-soft-line:#944F01;
  --error-bg:#5B0000;   --error-ink:#FF6960;   --error-line:#FF6960; --error-strong:#FFCDC7;
  --info-bg:#0C2657;    --info-ink:#C3E7FE;    --info-line:#0498EC;
  --chip-bg:#1C2D38; --chip-line:#3D4F58; --chip-ink:#C1C7C6;
  --btn-bg:#3D4F58; --btn-ink:#FFFFFF; --btn-line:#889397; --btn-hover-bg:#5C6C75; --copy-bg:#3D4F58;
  --code-bg:#001E2B; --code-line:#3D4F58; --code-ink:#E8EDEB; --code-inline-ink:#C1C7C6;
  --link:#04A1FB; --focus:#0498EC;
  --focus-ring:0 0 0 2px #001E2B, 0 0 0 4px #0498EC; --focus-ring-input:0 0 0 3px #0498EC;
  --hover-ring:0 0 0 3px #3D4F58; --hover-bg:rgb(255 255 255 / .07); --selection:#083C90;
  --shadow-1:none; --shadow-card:0 4px 20px -4px rgb(0 0 0 / .45);
  --shadow-2:0 18px 18px -15px rgb(0 0 0 / .45); --shadow-3:0 8px 20px -8px rgb(0 0 0 / .60);
}

/* Base */
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;background:var(--bg)}
body{margin:0;background:var(--bg);color:var(--ink);font:400 15px/1.6 var(--font-sans);-webkit-font-smoothing:antialiased}
::selection{background:var(--selection)}
h1,h2,h3,h4{margin:0;text-wrap:balance}
h1{font:400 clamp(30px,4.2vw,44px)/1.2 var(--font-serif);color:var(--h-ink);letter-spacing:-.005em}
h2{font:400 clamp(24px,3vw,30px)/1.25 var(--font-serif);color:var(--h-ink)}
h3{font:500 18px/1.35 var(--font-sans);color:var(--ink)}
p{margin:0}
a{color:var(--link);text-underline-offset:2px}
b,strong{font-weight:600}
button,input,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.mono{font-family:var(--font-mono);font-size:.9em}
.eyebrow{font:600 12px/20px var(--font-sans);letter-spacing:.4px;text-transform:uppercase;color:var(--muted)}
.muted{color:var(--muted)}
.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}
:not(pre)>code{font:400 .87em/1 var(--font-mono);background:var(--sunk);border:1px solid var(--line-strong);border-radius:4px;padding:1px 4px;color:var(--code-inline-ink);overflow-wrap:anywhere}

/* Layout helpers (replace inline styles) */
.stack{display:grid;gap:24px}
.stack-sm{display:grid;gap:12px}
.stack-xs{display:grid;gap:6px}
.narrow{max-width:72ch}
.narrow-sm{max-width:64ch}
.lede{max-width:75ch}
.row{display:flex;flex-wrap:wrap;gap:8px 10px;align-items:center}
.row.spread{justify-content:space-between;gap:16px}
.grow{flex:1 1 220px;min-width:0}
.panel{display:grid;gap:14px;min-width:0}

/* App bar: official MongoDB logo (unaltered), divider, product name as text */
.appbar{background:var(--header-bg);border-bottom:1px solid var(--line)}
.appbar-in{max-width:1212px;margin:0 auto;height:56px;padding:0 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.lockup{display:flex;align-items:center;min-width:0;text-decoration:none;color:var(--ink);border-radius:4px}
.logo{display:block;height:24px;width:auto;flex:none}
.logo-dark{display:none}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .logo-light{display:none}
  :root:not([data-theme="light"]) .logo-dark{display:block}
}
:root[data-theme="dark"] .logo-light{display:none}
:root[data-theme="dark"] .logo-dark{display:block}
.lockup-div{width:1px;height:24px;background:var(--line-strong);margin:0 16px;flex:none}
.lockup-name{font:500 17px/1 var(--font-sans);white-space:nowrap;letter-spacing:-.005em}
.appbar-end{display:flex;align-items:center;gap:12px;flex:none}

/* Who's online (app bar): dot + up to 3 faces + count; opens a list */
.presence{position:relative}
.presence summary{display:flex;align-items:center;gap:8px;height:30px;padding:0 10px 0 8px;border:1px solid var(--line);border-radius:999px;background:var(--sunk);color:var(--muted);font:500 13px/1 var(--font-sans);cursor:pointer;list-style:none;white-space:nowrap;transition:color .15s ease-in-out,border-color .15s ease-in-out}
.presence summary::-webkit-details-marker{display:none}
.presence summary:hover,.presence[open] summary{color:var(--ink);border-color:var(--line-strong)}
.presence summary:focus-visible{outline:none;box-shadow:var(--focus-ring)}
.presence-dot{width:8px;height:8px;border-radius:50%;background:var(--success-line);box-shadow:0 0 0 3px var(--success-bg);flex:none}
.presence-faces{display:flex}
.presence-faces .face{margin-left:-6px;box-shadow:0 0 0 2px var(--sunk)}
.presence-faces .face:first-child{margin-left:0}
.presence-n{font-variant-numeric:tabular-nums}
.face{width:20px;height:20px;border-radius:50%;flex:none;object-fit:cover}
.face-i{display:grid;place-items:center;background:var(--accent-soft);color:var(--accent-soft-ink);font:600 10px/1 var(--font-sans)}
.presence-pop{position:absolute;right:0;top:calc(100% + 6px);z-index:20;min-width:220px;max-width:min(300px,calc(100vw - 32px));max-height:min(360px,70vh);overflow:auto;padding:8px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow-card)}
.presence-head{margin:4px 8px 6px;font:600 11px/1.2 var(--font-sans);letter-spacing:.4px;text-transform:uppercase;color:var(--muted)}
.presence-pop ul{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.presence-pop li{display:flex;align-items:center;gap:10px;padding:6px 8px;border-radius:8px;font-size:14px;color:var(--ink);min-width:0}
.presence-pop li > span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.presence-pop .face{width:24px;height:24px}

.theme-toggle{display:inline-flex;gap:2px;padding:2px;border:1px solid var(--line);border-radius:8px;background:var(--sunk);flex:none}
.theme-toggle button{width:30px;height:26px;display:grid;place-items:center;padding:0;border:0;border-radius:6px;background:none;color:var(--muted);cursor:pointer;transition:background-color .15s ease-in-out,color .15s ease-in-out}
.theme-toggle button:hover{color:var(--ink);background:var(--hover-bg)}
.theme-toggle button[aria-pressed="true"]{background:var(--ink);color:var(--bg)}
.theme-toggle svg{width:16px;height:16px}

/* Layer diagrams (partials/diagram_*.html): inline SVG that follows the theme */
.diagram-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.dg{display:block;width:100%;height:auto;max-width:960px}
@media (max-width:720px){.dg{min-width:680px}} /* phones: scroll sideways rather than shrink the text */
.dg text{font-family:var(--font-sans);fill:var(--ink)}
.dg .box{fill:var(--surface);stroke:var(--line-strong);stroke-width:1.5}
.dg .dash{stroke-dasharray:5 4}
.dg .soft{fill:var(--accent-soft);stroke:var(--accent-soft-line);stroke-width:1.5}
.dg .chip{fill:var(--sunk);stroke:var(--line);stroke-width:1}
.dg .chip.hi{stroke:var(--accent-ink);stroke-width:1.5}
.dg .chip.ae{fill:var(--accent-soft);stroke:var(--accent-soft-line)}
.dg .chip.no{fill:var(--error-bg);stroke:var(--error-line);stroke-dasharray:4 3}
.dg text.no{fill:var(--error-ink)}
.dg .ink{fill:var(--ink)}
.dg .on-ink{fill:var(--bg)}
.dg .plat{fill:var(--accent-soft);stroke:var(--accent-border);stroke-width:2}
.dg .dot{fill:var(--accent-ink)}
.dg .ln{stroke:var(--line-strong);stroke-width:1.5}
.dg .h{font-size:17px;font-weight:600}
.dg .t{font-size:13px}
.dg .b{font-weight:600}
.dg .s{font-size:11.5px;fill:var(--muted)}
.dg .s.on-ink{fill:var(--bg);opacity:.85}
.dg .c{fill:var(--ink)}
.dg .lbl{font-size:11px;font-weight:600;letter-spacing:.4px;fill:var(--muted)}
.dg .mono{font-family:var(--font-mono);font-size:12px}
.dg .ac{fill:var(--accent-ink)}

/* Animated ecosystem diagram: stages s1..s6 fade and rise in sequence once .dg-anim is set */
.dg-eco{display:grid;gap:16px;grid-template-columns:minmax(0,1fr) 260px;align-items:start}
@media (max-width:860px){.dg-eco{grid-template-columns:minmax(0,1fr)}}
.dg-side{display:grid;gap:10px;justify-items:start}
.dg-steps{margin:0;padding-left:20px;display:grid;gap:6px;font-size:13px;color:var(--muted)}
.dg-steps li{transition:color .3s ease}
.dg-eco.dg-anim .dg svg,.dg-eco .dg .s1,.dg-eco .dg .s2,.dg-eco .dg .s3,.dg-eco .dg .s4,.dg-eco .dg .s5,.dg-eco .dg .s6{opacity:0}
.dg-eco.dg-anim .dg .s1,.dg-eco.dg-anim .dg .s2,.dg-eco.dg-anim .dg .s3,.dg-eco.dg-anim .dg .s4,.dg-eco.dg-anim .dg .s5,.dg-eco.dg-anim .dg .s6{animation:dg-in .55s ease-out both}
.dg-eco.dg-anim .dg .s4{animation-name:dg-slide}
.dg-eco.dg-anim .dg .s1{animation-delay:.2s}.dg-eco.dg-anim .dg .s2{animation-delay:1.2s}.dg-eco.dg-anim .dg .s3{animation-delay:2.2s}
.dg-eco.dg-anim .dg .s4{animation-delay:3.2s;animation-duration:.8s}.dg-eco.dg-anim .dg .s5{animation-delay:4.4s}.dg-eco.dg-anim .dg .s6{animation-delay:5.3s}
.dg-eco.dg-anim .dg-steps .s1{animation:dg-step 6s both .2s}.dg-eco.dg-anim .dg-steps .s2{animation:dg-step 6s both 1.2s}
.dg-eco.dg-anim .dg-steps .s3{animation:dg-step 6s both 2.2s}.dg-eco.dg-anim .dg-steps .s4{animation:dg-step 6s both 3.2s}
.dg-eco.dg-anim .dg-steps .s5{animation:dg-step 6s both 4.4s}.dg-eco.dg-anim .dg-steps .s6{animation:dg-step 6s both 5.3s}
@keyframes dg-in{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@keyframes dg-slide{from{opacity:0;transform:translateY(60px)}60%{opacity:1;transform:translateY(-4px)}to{opacity:1;transform:none}}
@keyframes dg-step{0%{color:var(--muted);font-weight:400}5%,100%{color:var(--ink);font-weight:600}}
.dg-eco.dg-done .dg [class^="s"],.dg-eco.dg-done .dg [class*=" s"]{opacity:1;animation:none}
.dg-eco.dg-done .dg-steps li{color:var(--ink);font-weight:600;animation:none}
@media (prefers-reduced-motion:reduce){.dg-eco .dg g{opacity:1!important;animation:none!important}.dg-eco .dg-steps li{color:var(--ink);font-weight:600;animation:none!important}.dg-replay{display:none}}
/* Glossary terms: dotted underline, popover on click, full page at /glossary */
.term{all:unset;cursor:help;border-bottom:1px dotted var(--accent-ink);color:inherit;font:inherit}
.term:hover,.term:focus-visible{background:var(--accent-soft);border-bottom-style:solid;outline:none}
.termpop{position:absolute;z-index:30;padding:12px 14px;display:grid;gap:6px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow-card);font-size:13px;color:var(--ink)}
.termpop b{font-size:14px}
.termpop p{margin:0;color:var(--muted)}
.termpop a{color:var(--link);font-size:12px}
.gloss-index{display:flex;flex-wrap:wrap;gap:4px 10px;font-size:13px}
.gloss{margin:0;display:grid;gap:14px}
.gloss-item{padding:12px 14px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface);scroll-margin-top:72px}
.gloss-item:target{border-color:var(--accent-ink);box-shadow:0 0 0 3px var(--accent-ring)}
.gloss dt{font-weight:600;font-size:15px;margin-bottom:6px}
.gloss dd{margin:0;display:grid;gap:4px;font-size:14px}
.gloss dd p{margin:0}

/* Tutor questions page and FAQ */
.qmods{display:flex;flex-wrap:wrap;gap:6px}
.qmod{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border:1px solid var(--line);border-radius:999px;background:var(--sunk);color:var(--muted);font-size:13px;text-decoration:none}
.qmod b{font-weight:600;color:var(--ink)}
.qmod:hover{color:var(--ink);border-color:var(--line-strong)}
.qmod.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.qmod.on b{color:var(--bg)}
.qtable td{vertical-align:top}
.nowrap{white-space:nowrap}
.qanswer{min-width:220px;max-width:420px;font-size:13px}
.qanswer summary{cursor:pointer;color:var(--link)}
.faq{margin:0;display:grid;gap:6px}
.faq dt{font-weight:600}
.faq dd{margin:0 0 6px;color:var(--muted);font-size:14px}
.faqblock{display:grid;gap:8px;padding:14px 16px;margin-top:16px;border:1px solid var(--line);border-radius:var(--r);background:var(--sunk)}
.faq-suggest{margin-top:12px;display:grid;gap:8px}

/* Footer: which build is deployed (app/VERSION, written at deploy time) */
.foot{display:flex;justify-content:space-between;align-items:center;gap:8px 16px;flex-wrap:wrap;padding:16px 0 0;border-top:1px solid var(--line);font-size:12px;color:var(--subtle)}
.foot a{color:var(--subtle)}
.foot a:hover{color:var(--ink)}
body > .foot{max-width:1212px;margin:0 auto;padding:16px 16px 24px}

/* Page shell */
.wrap{max-width:1212px;margin:0 auto;padding:20px 16px 56px;display:grid;gap:20px}
.wrap>*{min-width:0}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:8px 12px;flex-wrap:wrap}
.topbar-end{display:flex;align-items:center;gap:8px 16px;flex-wrap:wrap;min-width:0}
.ico{width:16px;height:16px;flex:none}
.ico-lg{width:32px;height:32px}
.extlink{display:inline-flex;align-items:center;gap:6px;height:28px;padding:0 10px;border:1px solid var(--accent-soft-line);border-radius:999px;background:var(--accent-soft);color:var(--accent-soft-ink);font:500 13px/1 var(--font-sans);text-decoration:none;white-space:nowrap;transition:box-shadow .15s ease-in-out}
.extlink:hover,.extlink[aria-current="page"]{box-shadow:0 0 0 3px var(--accent-ring)}
.extlink:focus-visible{outline:none;box-shadow:var(--focus-ring)}
.ext-hero{display:flex;gap:16px;align-items:flex-start}
.ext-tile{display:grid;place-items:center;width:56px;height:56px;flex:none;border-radius:14px;background:var(--accent-soft);color:var(--accent-soft-ink);border:1px solid var(--accent-soft-line)}
.ext-steps,.ext-list{margin:0;padding-left:20px;display:grid;gap:8px;font-size:14px}
.btn .ico{margin-right:2px}
.userchip{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);min-width:0}
.userchip img{width:24px;height:24px;border-radius:50%}
.userchip a{color:var(--muted)}
.userchip a:hover{color:var(--ink)}

/* Learner strip */
header.top{display:flex;flex-wrap:wrap;gap:16px 32px;align-items:flex-end;justify-content:space-between}
.title-block{display:grid;gap:8px;min-width:0;max-width:60ch}
.title-block .muted{font-size:16px}
.stats{display:grid;grid-template-columns:repeat(4,minmax(96px,auto));gap:8px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:10px 14px;display:grid;gap:4px}
.stat b{font:500 22px/1.1 var(--font-sans);font-variant-numeric:tabular-nums;color:var(--ink)}
.stat span{font:600 11px/1.2 var(--font-sans);letter-spacing:.4px;text-transform:uppercase;color:var(--muted)}
@media (max-width:600px){
  .stats{grid-template-columns:repeat(2,minmax(0,1fr));width:100%}
}

/* Section tabs (header nav style: muted links, active = ink + 2px brand underline). Scrolls on one line on phones. */
nav.tabs{display:flex;gap:4px;overflow-x:auto;overflow-y:hidden;scrollbar-width:none;box-shadow:inset 0 -1px 0 var(--line)}
nav.tabs::-webkit-scrollbar{display:none}
nav.tabs a{flex:none;white-space:nowrap;padding:12px 14px 10px;color:var(--muted);font-weight:500;font-size:14px;text-decoration:none;border-bottom:2px solid transparent;transition:color .15s ease-in-out}
nav.tabs a:hover{color:var(--ink)}
nav.tabs a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--accent-ink)}

/* Main grid */
.main{display:grid;grid-template-columns:280px minmax(0,1fr);gap:28px;align-items:start}
@media (max-width:860px){.main{grid-template-columns:minmax(0,1fr);gap:20px}}

/* Trace rail */
.rail{position:relative;display:grid;gap:2px}
.rail::before{content:"";position:absolute;left:21px;top:16px;bottom:16px;width:2px;background:var(--line)}
.step{position:relative;display:grid;grid-template-columns:28px minmax(0,1fr);gap:12px;align-items:start;padding:8px 10px 8px 8px;border-radius:8px;transition:background-color .15s ease-in-out}
a.step{text-decoration:none;color:inherit}
.step:hover{background:var(--hover-bg)}
.step[aria-current="true"]{background:var(--accent-soft);box-shadow:inset 3px 0 0 var(--brand-leaf)}
.step[aria-current="true"] .name{color:var(--accent-soft-ink)}
.node{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;font:600 11px/1 var(--font-mono);background:var(--bg);border:2px solid var(--line-strong);color:var(--muted);position:relative;z-index:1}
.node.progress{border-color:var(--accent-ink);color:var(--accent-ink)}
.node.done{background:var(--accent);border-color:var(--accent-border);color:var(--on-accent);font-family:var(--font-sans);font-size:13px}
.step .meta{display:grid;gap:2px;min-width:0}
.step .name{font-weight:500;font-size:14px;line-height:1.35}
.step .sub{font-size:12px;color:var(--muted)}
.bar{display:block;height:4px;border-radius:2px;background:var(--line);overflow:hidden;margin-top:6px}
.bar i{display:block;height:100%;background:var(--brand-leaf);width:0}

/* Workspace card */
.work{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:24px;display:grid;gap:20px;min-width:0;box-shadow:var(--shadow-card)}
@media (max-width:600px){.work{padding:16px}}
.work-head{display:flex;flex-wrap:wrap;gap:12px 16px;justify-content:space-between;align-items:flex-start}
.work-head .h{display:grid;gap:6px;min-width:0;max-width:62ch}
.pills{display:flex;gap:6px;flex-wrap:wrap}
.pill{font:600 11px/16px var(--font-sans);letter-spacing:.4px;text-transform:uppercase;padding:2px 10px;border-radius:999px;border:1px solid var(--chip-line);background:var(--chip-bg);color:var(--chip-ink);white-space:nowrap}
.pill.ok{background:var(--accent-soft);border-color:var(--accent-soft-line);color:var(--accent-soft-ink)}
.pill.gold{background:var(--warn-bg);border-color:var(--warn-soft-line);color:var(--warn-ink)}

/* Sub-tabs: LeafyGreen segmented control */
.subtabs{display:inline-flex;justify-self:start;gap:2px;padding:3px;max-width:100%;overflow-x:auto;scrollbar-width:none;background:var(--sunk);border:1px solid var(--line);border-radius:8px}
.subtabs::-webkit-scrollbar{display:none}
.subtabs a{flex:none;padding:5px 14px;border-radius:6px;font-size:13px;font-weight:500;line-height:20px;color:var(--muted);text-decoration:none;white-space:nowrap;transition:background-color .15s ease-in-out,color .15s ease-in-out}
.subtabs a:hover{color:var(--ink);background:var(--hover-bg)}
.subtabs a[aria-current="page"]{background:var(--ink);color:var(--bg)}

/* Learn tab */
ul.points{margin:0;padding-left:20px;display:grid;gap:10px;max-width:72ch}
ul.points li::marker{color:var(--accent-ink)}
.links{display:flex;flex-wrap:wrap;gap:8px}
.links a{display:inline-flex;align-items:center;font-size:13px;font-weight:500;border:1px solid var(--line);background:var(--surface);border-radius:6px;padding:6px 12px;text-decoration:none;color:var(--link);transition:border-color .15s ease-in-out,box-shadow .15s ease-in-out}
.links a:hover{border-color:var(--line-control);box-shadow:var(--hover-ring)}
.diagram{margin:0;display:grid;gap:8px;max-width:820px}
.diagram.wide{max-width:none}
.diagram .plate{background:#FFFFFF;border:1px solid var(--line);border-radius:var(--r);padding:16px} /* light-only artwork: always on white */
.diagram img{display:block;width:100%;height:auto}
.diagram figcaption{font-size:12px;color:var(--muted)}

/* Labs */
.labs{display:grid;gap:8px;min-width:0}
.lab{border:1px solid var(--line);border-radius:var(--r);background:var(--surface);min-width:0}
.lab>summary{display:grid;grid-template-columns:22px minmax(0,1fr) auto;gap:12px;align-items:center;padding:12px 16px;cursor:pointer;list-style:none;border-radius:var(--r);transition:background-color .15s ease-in-out}
.lab>summary::-webkit-details-marker{display:none}
.lab>summary:hover{background:var(--hover-bg)}
.lab[open]>summary{border-bottom:1px solid var(--line);border-radius:var(--r) var(--r) 0 0}
.lab-title{font-weight:500}
.lab.checked .lab-title{color:var(--muted)}
.lab-status{width:20px;height:20px;border-radius:4px;border:1.5px solid var(--line-control);display:grid;place-items:center;font:600 12px/1 var(--font-sans);color:var(--on-accent)}
.lab-status.ok{background:var(--accent);border-color:var(--accent-border)}
/* Self-reported: drawn half-filled circle instead of the ◐ glyph (which most fonts render tiny) */
.lab-status.self{background:var(--warn-bg);border-color:var(--warn-line);font-size:0}
.lab-status.self::before{content:"";width:10px;height:10px;border-radius:50%;border:1.5px solid var(--warn-ink);background:linear-gradient(90deg,var(--warn-ink) 50%,transparent 50%)}
.lab-meta{font:500 12px/1 var(--font-mono);color:var(--muted);white-space:nowrap}
@media (max-width:600px){
  .lab>summary{grid-template-columns:22px minmax(0,1fr);row-gap:4px;padding:12px}
  .lab-meta{grid-column:2}
  .lab-body{padding:14px 12px}
  .steps li.cmd{margin-left:0}
}
.lab-body{padding:16px;display:grid;gap:14px;min-width:0}
.lab-why{color:var(--muted);font-size:14px;max-width:75ch}
.steps{margin:0;padding:0;list-style:none;display:grid;grid-template-columns:minmax(0,1fr);gap:10px;max-width:84ch;counter-reset:step}
.steps>li{min-width:0;position:relative}
.steps>li:not(.cmd){counter-increment:step;padding-left:30px}
.steps>li:not(.cmd)::before{content:counter(step);position:absolute;left:0;top:2px;width:20px;height:20px;border-radius:50%;background:var(--sunk);border:1px solid var(--line-strong);color:var(--muted);font:600 11px/18px var(--font-mono);text-align:center}
.steps li.cmd{margin-left:30px}

/* Code blocks (LeafyGreen Code) */
.steps pre,.md pre,pre.codeblock{margin:0;padding:10px 16px;background:var(--code-bg);border:1px solid var(--code-line);border-radius:var(--r);color:var(--code-ink);overflow-x:auto}
.steps pre,.codewrap pre{padding-right:80px}
pre code,pre.codeblock{font:400 13px/20px var(--font-mono)}
pre code{background:none;border:0;padding:0;color:inherit;white-space:pre}
pre.codeblock code{white-space:pre-wrap;overflow-wrap:anywhere}
.codewrap{position:relative;min-width:0}
.copy{position:absolute;top:7px;right:8px;height:26px;padding:0 10px;font:500 12px/1 var(--font-sans);border-radius:6px;border:1px solid var(--line-strong);background:var(--copy-bg);color:var(--ink);cursor:pointer;transition:box-shadow .15s ease-in-out}
.copy:hover{box-shadow:var(--hover-ring)}
.copy:focus-visible{outline:none;box-shadow:var(--focus-ring)}

/* Lab checks */
.lab-check{display:grid;gap:10px;border-top:1px solid var(--line);padding-top:14px}
.lab-check form{display:grid;gap:8px}
.lab-check textarea{min-height:110px}
.check-fail{background:var(--error-bg);border:1px solid var(--error-line);border-radius:8px;padding:12px 16px;display:grid;gap:6px;font-size:14px;color:var(--ink)}
.check-fail b{color:var(--error-strong)}
.check-fail ul{margin:0;padding-left:18px}
.check-fail .linkish{color:var(--ink)}
.linkish{background:none;border:0;padding:0;color:var(--link);font:inherit;font-size:13px;text-decoration:underline;text-underline-offset:2px;cursor:pointer;justify-self:start}

/* Notes, banners, toasts (VIA banners: tinted bg + 1px border + status text) */
.objectives{display:grid;gap:8px;padding:14px 16px;margin-bottom:16px;border-left:3px solid var(--accent-ink);border-radius:0 var(--r) var(--r) 0;background:var(--sunk)}
.objectives ol{margin:0;padding-left:20px;display:grid;gap:6px;font-size:14px;color:var(--ink)}
.selfcert{display:grid;gap:10px;justify-items:start;padding:12px 14px;margin-bottom:12px;border:1px dashed var(--line-strong);border-radius:var(--r);background:var(--sunk)}
.note{font-size:13px;color:var(--muted)}
.note.ok{color:var(--success-ink)}
.note.err{color:var(--error-ink)}
.banner{border:1px solid var(--info-line);background:var(--info-bg);color:var(--info-ink);border-radius:8px;padding:10px 14px;font-size:14px}
.banner.ok{border-color:var(--success-line);background:var(--success-bg);color:var(--success-ink)}
.toast{display:flex;gap:10px;align-items:center;background:var(--success-bg);color:var(--success-ink);border:1px solid var(--success-line);border-radius:8px;padding:10px 14px;font-weight:500;font-size:14px}
.toast::before{content:"★";color:var(--accent-ink)}
.toast.err{background:var(--error-bg);color:var(--error-strong);border-color:var(--error-line)}
.toast.err::before{content:"!";display:grid;place-items:center;width:18px;height:18px;border-radius:50%;background:var(--error-ink);color:var(--error-bg);font-size:12px;font-weight:700;flex:none}
#toast:empty{display:none}
body>.toast{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:30;width:max-content;max-width:calc(100% - 32px);box-shadow:var(--shadow-3)}
.htmx-indicator{display:none}.htmx-request .htmx-indicator,.htmx-request.htmx-indicator{display:inline}

/* Buttons (LeafyGreen Button) */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:0 14px;border-radius:6px;border:1px solid var(--btn-line);background:var(--btn-bg);color:var(--btn-ink);font:500 13px/1.2 var(--font-sans);text-decoration:none;cursor:pointer;transition:background-color .15s ease-in-out,box-shadow .15s ease-in-out,border-radius .15s ease-in-out}
.btn:hover{background:var(--btn-hover-bg);box-shadow:var(--hover-ring)}
.btn.primary{background:var(--accent);border-color:var(--accent-border);color:var(--on-accent)}
.btn.primary:hover{background:var(--accent-hover);box-shadow:0 0 0 3px var(--accent-ring)}
.btn:focus-visible{outline:none;box-shadow:var(--focus-ring)}
.btn:disabled{opacity:.55;cursor:default;box-shadow:none}
.btn.block{width:100%}
.btn.lg{min-height:48px;font-size:16px;padding:0 24px}
/* mongodb.com "Get Started" CTA (login only): carries its own colours, so it works on both themes */
.btn.cta{background:#00ED64;color:#001E2B;border-color:#001E2B;border-radius:4px}
.btn.cta:hover{background:#00ED64;border-radius:40px;box-shadow:none}
.btn.cta:focus-visible{box-shadow:0 0 0 3px rgba(19,170,82,.4)}

/* Forms */
input[type=text],input[type=password],input[type=email],textarea{width:100%;border:1px solid var(--line-control);border-radius:6px;background:var(--input-bg);color:var(--ink);font-size:14px;transition:border-color .15s ease-in-out,box-shadow .15s ease-in-out}
input[type=text],input[type=password],input[type=email]{min-height:36px;padding:6px 12px}
textarea{min-height:96px;padding:10px 12px;line-height:1.5;resize:vertical}
textarea.tall{min-height:180px}
textarea.mono{font:400 13px/20px var(--font-mono)}
input::placeholder,textarea::placeholder{color:var(--subtle);opacity:1}
input:hover,textarea:hover{box-shadow:var(--hover-ring)}
input:focus-visible,textarea:focus-visible{outline:none;border-color:var(--focus);box-shadow:var(--focus-ring-input)}
.row>input.grow{width:auto}

/* Quiz */
.score-block{display:grid;gap:6px}
.score{font:400 40px/1 var(--font-serif);font-variant-numeric:tabular-nums;color:var(--ink)}
.q{margin:0;min-width:0;border:1px solid var(--line);border-radius:var(--r);padding:16px;display:grid;gap:12px;background:var(--surface)}
.q .stem{float:left;width:100%;padding:0;font-weight:500;font-size:15px}
.opts{display:grid;gap:6px}
.opt{display:grid;grid-template-columns:20px minmax(0,1fr);gap:10px;align-items:start;padding:10px 12px;border:1px solid var(--line-strong);border-radius:8px;background:var(--surface);font-size:14px;transition:border-color .15s ease-in-out,background-color .15s ease-in-out}
label.opt{cursor:pointer}
label.opt:hover{border-color:var(--line-control);background:var(--hover-bg)}
label.opt:has(input:checked){border-color:var(--accent-ink);background:var(--accent-soft)}
.opt input{margin:3px 0 0;accent-color:var(--accent-ink);width:16px;height:16px}
.opt.right{border-color:var(--success-line);background:var(--success-bg);box-shadow:inset 3px 0 0 var(--success-line)}
.opt.wrong{border-color:var(--error-line);background:var(--error-bg);box-shadow:inset 3px 0 0 var(--error-line)}
.opt.right>span:first-child::before{content:"✓";font-weight:600;color:var(--success-ink)}
.opt.wrong>span:first-child::before{content:"✕";font-weight:600;color:var(--error-ink)}
.why{font-size:13px;color:var(--muted);border-left:3px solid var(--info-line);padding-left:12px}

/* Tutor chat */
.chat{display:grid;gap:12px;max-height:520px;overflow:auto;padding:4px}
.msg{padding:12px 16px;border-radius:var(--r);max-width:82ch;white-space:pre-wrap;overflow-wrap:anywhere;font-size:14.5px}
.msg.me{background:var(--accent-soft);border:1px solid var(--accent-soft-line);color:var(--ink);justify-self:end;border-bottom-right-radius:4px}
.msg.ai{background:var(--surface);border:1px solid var(--line);border-bottom-left-radius:4px}
.msg.md{white-space:normal}
.msg.ai.note.err{color:var(--error-ink);border-color:var(--error-line);background:var(--error-bg)}
.md>:first-child{margin-top:0}.md>:last-child{margin-bottom:0}
.md p,.md ul,.md ol,.md pre,.md table,.md blockquote{margin:0 0 10px}
.md ul,.md ol{padding-left:22px}
.md h1,.md h2,.md h3,.md h4{font:600 15px/1.4 var(--font-sans);color:var(--ink);margin:14px 0 6px}
.md blockquote{border-left:3px solid var(--info-line);padding-left:12px;color:var(--muted)}
.md table{border-collapse:collapse;font-size:13px}
.md th,.md td{border:1px solid var(--line);padding:6px 10px;white-space:normal;text-align:left}
.md th{background:var(--sunk);font-weight:600}

/* Teach-back feedback (callout: bar on the left) */
.feedback{border-left:3px solid var(--success-line);padding:4px 0 4px 16px;display:grid;gap:10px}

/* Badges */
.shelf{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.badge{display:grid;justify-items:center;align-content:start;gap:8px;text-align:center;padding:18px 12px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
.badge .hex{width:64px;height:64px;overflow:visible}
.hex-o{fill:none;stroke:var(--line-strong);stroke-width:2.5;stroke-dasharray:5 4}
.hex-i{fill:none;stroke:var(--line);stroke-width:1.5}
.hex-t{font:600 15px var(--font-mono);fill:var(--subtle)}
.badge.on .hex-o{fill:var(--bc);stroke:var(--bc);stroke-dasharray:none}
.badge.on .hex-i{stroke:#FFFFFF;stroke-opacity:.5}
.badge.on .hex-t{fill:#FFFFFF}
/* --br: light tint of the same hue, used as the outline ring in dark mode */
.b0{--bc:var(--b0);--br:#00ED64}.b1{--bc:var(--b1);--br:#0498EC}.b2{--bc:var(--b2);--br:#B45AF2}.b3{--bc:var(--b3);--br:#FF6960}.b4{--bc:var(--b4);--br:#71F6BA}
.b5{--bc:var(--b5);--br:#FFC010}.b6{--bc:var(--b6);--br:#C3E7FE}.b7{--bc:var(--b7);--br:#C1C7C6}.b8{--bc:var(--b8);--br:#0498EC}
/* Dark: same fills (white label stays >= 4.5:1), plus a light ring so dark fills read on the dark card */
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]) .badge.on .hex-o{stroke:var(--br)} }
:root[data-theme="dark"] .badge.on .hex-o{stroke:var(--br)}
.badge .bn{font-weight:500;font-size:13px;line-height:1.35}
.badge .bd{font-size:12px;color:var(--muted)}
.badge.on .bd{color:var(--success-ink);font-weight:500}
.certs{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}
.cert{border:1px solid var(--line);border-radius:var(--r);padding:20px;background:var(--surface);display:grid;gap:10px;align-content:start}
.cert.earned{border-color:var(--success-line);background:var(--success-bg)}
.cert h3{display:flex;gap:8px;align-items:center}
.cert .star{color:var(--subtle)}
.cert.earned .star{color:var(--accent-ink)}
.req{font-size:13px;display:grid;gap:4px}
.req div::before{content:"○ ";color:var(--subtle)}
.req div.met::before{content:"● ";color:var(--success-line)}

/* Team */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
.tbl-wrap table{border-collapse:collapse;width:100%;min-width:640px;font-size:14px}
.tbl-wrap th,.tbl-wrap td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);white-space:nowrap}
.tbl-wrap th{font:600 12px/16px var(--font-sans);letter-spacing:.4px;text-transform:uppercase;color:var(--muted);background:var(--sunk)}
.tbl-wrap tbody tr:last-child td{border-bottom:0}
.tbl-wrap tbody tr:hover{background:var(--hover-bg)}
td.num{font-variant-numeric:tabular-nums}
.mini{display:inline-flex;gap:3px}
.mini i{width:10px;height:10px;border-radius:2px;background:var(--line);display:inline-block}
.mini i.on{background:var(--brand-leaf)}
.who{display:flex;align-items:center;gap:8px}
.who img{width:24px;height:24px;border-radius:50%}

/* CLI approve */
.code-display{font:600 30px/1.2 var(--font-mono);letter-spacing:.08em;padding:12px 20px;justify-self:start;background:var(--code-bg);border:1px solid var(--code-line);border-radius:var(--r)}

/* Login */
.login{max-width:1100px;min-height:calc(100vh - 57px);align-content:center;margin:0 auto;padding:48px 16px 64px;display:grid;grid-template-columns:minmax(0,420px) minmax(0,1fr);gap:56px;align-items:center}
.login-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:32px;display:grid;gap:16px;box-shadow:var(--shadow-card)}
.login-hero{margin:0;min-width:0}
.login-hero img{display:block;width:100%;height:auto}
.or{display:flex;align-items:center;gap:12px;color:var(--subtle);font-size:12px;text-transform:uppercase;letter-spacing:.4px}
.or::before,.or::after{content:"";flex:1;height:1px;background:var(--line)}
@media (max-width:860px){
  .login{grid-template-columns:minmax(0,1fr);padding-top:24px;gap:24px}
  .login-hero{order:-1;width:100%;max-width:460px;justify-self:center}
}
@media (max-width:600px){.login-card{padding:24px 20px}}

/* Phones: compact app bar so logo + name + theme toggle fit on one 56px row */
@media (max-width:520px){
  .logo{height:20px}
  .lockup-div{height:20px;margin:0 10px}
  .lockup-name{font-size:14px}
  .theme-toggle button{width:26px}
  .appbar-end{gap:8px}
  .presence-faces,.presence-word{display:none}
  .presence summary{padding:0 10px}
}
/* Narrow phones, signed in: the logo alone, so the online count and theme toggle still fit */
@media (max-width:440px){ .has-presence .lockup-div,.has-presence .lockup-name{display:none} }
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}