/* ============================================================
   Backend Ops Academy — "mission-control console"
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  --bg:#080C16;
  --bg-2:#0B111F;
  --panel:#111A2C;
  --panel-2:#16223A;
  --panel-hi:#1C2B47;
  --line:#243349;
  --line-soft:#1A2637;
  --text:#E9EEF9;
  --text-dim:#93A2BE;
  --text-faint:#5B6982;
  --amber:#FFC24B;
  --amber-dim:#C8912E;
  --amber-soft:rgba(255,194,75,.10);
  --cyan:#3FE0D0;
  --cyan-soft:rgba(63,224,208,.10);
  --green:#5BD98C;
  --red:#FF6E6E;
  --violet:#9B8BFF;
  --shadow:0 24px 60px -20px rgba(0,0,0,.7);
  --font-d:'Space Grotesk',system-ui,sans-serif;
  --font-b:'IBM Plex Sans',system-ui,sans-serif;
  --font-m:'IBM Plex Mono',ui-monospace,monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;overflow-x:hidden}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-b);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  min-height:100vh;
}
/* faint circuit-grid backdrop */
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(var(--line-soft) 1px,transparent 1px),
    linear-gradient(90deg,var(--line-soft) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.35;
  mask-image:radial-gradient(circle at 50% 25%,#000 0%,transparent 78%);
  -webkit-mask-image:radial-gradient(circle at 50% 25%,#000 0%,transparent 78%);
}
body::after{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(700px 400px at 78% -5%,rgba(63,224,208,.09),transparent 60%),
    radial-gradient(800px 500px at 12% 8%,rgba(255,194,75,.07),transparent 55%);
}
.wrap{position:relative;z-index:1;max-width:1160px;margin:0 auto;padding:0 24px}

::selection{background:rgba(255,194,75,.3);color:#fff}
a{color:inherit}
button{font-family:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

.mono{font-family:var(--font-m)}
.eyebrow{
  font-family:var(--font-m);font-size:11.5px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--amber);font-weight:500;
}

/* ============ BOOT SEQUENCE ============ */
#boot{
  position:fixed;inset:0;z-index:1000;background:var(--bg);
  display:flex;align-items:center;justify-content:center;
  transition:opacity .6s ease;
}
#boot.done{opacity:0;pointer-events:none}
.boot-inner{width:min(680px,90vw);font-family:var(--font-m);font-size:13.5px}
.boot-bot{display:flex;align-items:center;gap:14px;margin-bottom:22px}
.boot-bot svg{width:42px;height:42px}
.boot-bot span{font-family:var(--font-d);font-weight:600;font-size:16px;letter-spacing:.04em}
.boot-line{color:var(--text-dim);white-space:pre-wrap;min-height:1.5em}
.boot-line .ok{color:var(--green)}
.boot-line .val{color:var(--cyan)}
.boot-line .warn{color:var(--amber)}
.cursor{display:inline-block;width:9px;height:16px;background:var(--amber);
  vertical-align:-3px;margin-left:2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.boot-skip{position:absolute;bottom:26px;right:26px;background:none;border:1px solid var(--line);
  color:var(--text-faint);font-family:var(--font-m);font-size:11px;padding:6px 12px;border-radius:6px;
  letter-spacing:.1em}
.boot-skip:hover{color:var(--text);border-color:var(--text-faint)}

/* ============ TOP BAR ============ */
header.bar{
  position:sticky;top:0;z-index:50;
  background:rgba(8,12,22,.82);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line-soft);
}
.bar-in{display:flex;align-items:center;gap:18px;height:64px}
.brand{display:flex;align-items:center;gap:12px;cursor:pointer;user-select:none}
.brand svg{width:34px;height:34px;flex:none}
.brand b{font-family:var(--font-d);font-weight:600;font-size:16.5px;letter-spacing:.02em}
.brand small{display:block;font-family:var(--font-m);font-size:9.5px;letter-spacing:.24em;
  color:var(--text-faint);text-transform:uppercase;margin-top:1px}
.bar-spacer{flex:1}
.clearance{font-family:var(--font-m);font-size:11.5px;color:var(--text-dim);
  display:flex;align-items:center;gap:8px}
.clearance .dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 8px var(--green)}
.clearance b{color:var(--amber);font-weight:600}
.btn{
  font-family:var(--font-m);font-size:12px;font-weight:500;letter-spacing:.06em;
  padding:9px 16px;border-radius:8px;border:1px solid var(--line);
  background:var(--panel);color:var(--text);transition:.16s;text-transform:uppercase;
}
.btn:hover{border-color:var(--amber);color:var(--amber)}
.btn.primary{background:var(--amber);color:#1a1204;border-color:var(--amber);font-weight:600}
.btn.primary:hover{background:#ffcf6c;color:#1a1204}
.btn.ghost{background:transparent}
.btn.cyan:hover{border-color:var(--cyan);color:var(--cyan)}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn.big{padding:13px 24px;font-size:12.5px}

/* ============ HERO ============ */
.hero{padding:76px 0 58px;position:relative}
.hero-grid{display:grid;grid-template-columns:1fr 340px;gap:48px;align-items:center}
.hero h1{
  font-family:var(--font-d);font-weight:700;font-size:clamp(38px,6vw,64px);
  line-height:1.02;letter-spacing:-.02em;margin:16px 0 20px;
}
.hero h1 .glow{color:var(--amber);text-shadow:0 0 34px rgba(255,194,75,.4)}
.hero p.lead{font-size:17.5px;color:var(--text-dim);max-width:540px;margin-bottom:30px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.stats{display:flex;gap:30px;margin-top:38px}
.stat b{font-family:var(--font-d);font-size:30px;font-weight:600;color:var(--text);display:block;line-height:1}
.stat span{font-family:var(--font-m);font-size:10.5px;letter-spacing:.16em;color:var(--text-faint);
  text-transform:uppercase}
/* mascot panel */
.mascot-panel{
  border:1px solid var(--line);border-radius:18px;background:linear-gradient(160deg,var(--panel),var(--bg-2));
  padding:30px 26px;position:relative;overflow:hidden;box-shadow:var(--shadow)
}
.mascot-panel::before{content:"";position:absolute;inset:0;
  background:radial-gradient(240px 160px at 50% 0%,rgba(63,224,208,.14),transparent 70%)}
.mascot-panel svg.byte{width:150px;height:150px;display:block;margin:6px auto 18px;position:relative}
.mascot-quote{font-family:var(--font-m);font-size:12.5px;color:var(--cyan);text-align:center;
  position:relative;line-height:1.7}
.mascot-quote .who{display:block;color:var(--text-faint);margin-top:10px;font-size:10.5px;letter-spacing:.14em}

/* ============ SECTION HEADS ============ */
.sec{padding:46px 0}
.sec-head{margin-bottom:34px;max-width:640px}
.sec-head h2{font-family:var(--font-d);font-weight:600;font-size:clamp(26px,3.4vw,36px);
  letter-spacing:-.01em;margin:12px 0 10px}
.sec-head p{color:var(--text-dim);font-size:15.5px}

/* ============ LEVEL MODULES ============ */
.levels{display:flex;flex-direction:column;gap:16px}
.level{
  border:1px solid var(--line);border-radius:16px;background:var(--panel);
  overflow:hidden;transition:border-color .18s;
}
.level:hover{border-color:var(--panel-hi)}
.level.open{border-color:var(--amber-dim)}
.level-head{display:flex;align-items:center;gap:20px;padding:22px 24px;cursor:pointer;user-select:none}
.level-num{
  font-family:var(--font-d);font-weight:700;font-size:22px;
  width:56px;height:56px;flex:none;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-2);border:1px solid var(--line);color:var(--text-dim);
  position:relative;transition:.18s;
}
.level.open .level-num,.level-num.done{color:var(--amber);border-color:var(--amber-dim);
  box-shadow:0 0 22px -6px rgba(255,194,75,.5);background:var(--amber-soft)}
.level-num.done::after{content:"✓";position:absolute;top:-7px;right:-7px;width:20px;height:20px;
  background:var(--green);color:#06210f;border-radius:50%;font-size:12px;font-weight:700;
  display:flex;align-items:center;justify-content:center;font-family:var(--font-b)}
.level-meta{flex:1;min-width:0}
.level-meta .eyebrow{margin-bottom:4px}
.level-meta h3{font-family:var(--font-d);font-weight:600;font-size:19px;margin-bottom:4px}
.level-meta p{color:var(--text-faint);font-size:13.5px;line-height:1.5;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.level-side{display:flex;flex-direction:column;align-items:flex-end;gap:8px;flex:none}
.level-count{font-family:var(--font-m);font-size:11px;color:var(--text-dim)}
.level-count b{color:var(--cyan)}
.mini-bar{width:110px;height:5px;border-radius:3px;background:var(--line-soft);overflow:hidden}
.mini-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--amber),var(--cyan));
  width:0;transition:width .5s ease;border-radius:3px}
.chev{color:var(--text-faint);transition:transform .2s;font-size:14px;font-family:var(--font-m)}
.level.open .chev{transform:rotate(90deg);color:var(--amber)}

.topics{max-height:0;overflow:hidden;transition:max-height .3s ease}
.level.open .topics{max-height:1400px}
.topics-in{padding:4px 24px 24px;display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:10px}
.topic-chip{
  display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:10px;
  border:1px solid var(--line-soft);background:var(--bg-2);text-align:left;color:var(--text);
  transition:.15s;position:relative;width:100%;
}
.topic-chip:hover{border-color:var(--cyan);background:var(--panel-2);transform:translateY(-1px)}
.topic-chip .tstate{width:8px;height:8px;border-radius:50%;background:var(--line);flex:none;transition:.15s}
.topic-chip.read .tstate{background:var(--green);box-shadow:0 0 7px var(--green)}
.topic-chip .tt{font-size:13.5px;font-weight:500;line-height:1.25}
.topic-chip .tt small{display:block;font-family:var(--font-m);font-size:10px;color:var(--text-faint);
  font-weight:400;margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ============ TOPIC DETAIL DRAWER ============ */
.scrim{position:fixed;inset:0;z-index:100;background:rgba(4,7,13,.72);backdrop-filter:blur(4px);
  opacity:0;pointer-events:none;transition:opacity .25s}
.scrim.show{opacity:1;pointer-events:auto}
.drawer{
  position:fixed;top:0;right:0;bottom:0;z-index:101;width:min(680px,96vw);
  background:var(--bg-2);border-left:1px solid var(--line);box-shadow:var(--shadow);
  transform:translateX(100%);transition:transform .3s cubic-bezier(.4,0,.2,1);
  display:flex;flex-direction:column;
}
.drawer.show{transform:translateX(0)}
.drawer-top{display:flex;align-items:center;gap:14px;padding:20px 24px;border-bottom:1px solid var(--line-soft);flex:none}
.drawer-top .eyebrow{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.drawer-close{background:none;border:1px solid var(--line);color:var(--text-dim);width:34px;height:34px;
  border-radius:8px;font-size:16px;line-height:1;flex:none}
.drawer-close:hover{border-color:var(--red);color:var(--red)}
.drawer-body{overflow-y:auto;padding:26px 24px 30px;flex:1}
.drawer-body h2{font-family:var(--font-d);font-weight:600;font-size:29px;letter-spacing:-.01em;line-height:1.1}
.drawer-body .tag{color:var(--cyan);font-size:15px;margin:8px 0 26px;font-style:italic}
.block{margin-bottom:24px}
.block .lbl{display:flex;align-items:center;gap:9px;margin-bottom:9px;
  font-family:var(--font-m);font-size:11px;letter-spacing:.16em;text-transform:uppercase;font-weight:500}
.block .lbl .ic{width:22px;height:22px;border-radius:6px;display:flex;align-items:center;justify-content:center;
  font-size:12px;flex:none}
.block.signal .lbl{color:var(--amber)} .block.signal .ic{background:var(--amber-soft);color:var(--amber)}
.block.prod .lbl{color:var(--cyan)} .block.prod .ic{background:var(--cyan-soft);color:var(--cyan)}
.block p{color:var(--text-dim);font-size:14.5px;line-height:1.72}
.li-box{border:1px solid var(--line);border-radius:12px;background:var(--panel);overflow:hidden}
.li-box .li-head{display:flex;align-items:center;justify-content:space-between;
  padding:12px 15px;border-bottom:1px solid var(--line-soft);background:var(--bg-2)}
.li-box .li-head .lbl{margin:0;color:var(--violet)}
.li-box .li-head .ic{background:rgba(155,139,255,.12);color:var(--violet)}
.li-actions{display:flex;gap:8px}
.icon-btn{background:none;border:1px solid var(--line);color:var(--text-dim);border-radius:7px;
  padding:5px 11px;font-family:var(--font-m);font-size:10.5px;letter-spacing:.06em;transition:.15s;text-transform:uppercase}
.icon-btn:hover{border-color:var(--violet);color:var(--violet)}
.icon-btn.copied{border-color:var(--green);color:var(--green)}
.li-text{padding:16px 17px;font-size:13.5px;line-height:1.7;white-space:pre-wrap;color:var(--text);
  max-height:280px;overflow-y:auto}
.drawer-foot{display:flex;align-items:center;gap:12px;padding:16px 24px;border-top:1px solid var(--line-soft);
  flex:none;background:var(--bg-2)}
.mark-read{flex:1}
.nav-btn{background:var(--panel);border:1px solid var(--line);color:var(--text-dim);width:40px;height:40px;
  border-radius:9px;font-size:16px;transition:.15s}
.nav-btn:hover:not(:disabled){border-color:var(--cyan);color:var(--cyan)}
.nav-btn:disabled{opacity:.3;cursor:not-allowed}

/* ============ EXAM ============ */
.exam-view{display:none;padding:56px 0 80px}
.exam-view.show{display:block}
.exam-card{max-width:760px;margin:0 auto;border:1px solid var(--line);border-radius:18px;
  background:var(--panel);box-shadow:var(--shadow);overflow:hidden}
.exam-hd{padding:30px 34px;border-bottom:1px solid var(--line-soft);
  background:linear-gradient(160deg,var(--panel-2),var(--panel))}
.exam-hd h2{font-family:var(--font-d);font-weight:600;font-size:28px;margin:10px 0 8px}
.exam-hd p{color:var(--text-dim);font-size:14.5px}
.exam-progress{height:5px;background:var(--line-soft)}
.exam-progress i{display:block;height:100%;background:linear-gradient(90deg,var(--amber),var(--cyan));width:0;transition:.3s}
.exam-body{padding:32px 34px}
.q-count{font-family:var(--font-m);font-size:11px;letter-spacing:.14em;color:var(--text-faint);text-transform:uppercase}
.q-lvl{font-family:var(--font-m);font-size:11px;color:var(--amber);float:right}
.q-text{font-family:var(--font-d);font-weight:500;font-size:20px;line-height:1.35;margin:14px 0 22px}
.opts{display:flex;flex-direction:column;gap:11px}
.opt{display:flex;align-items:flex-start;gap:13px;padding:15px 17px;border-radius:11px;
  border:1px solid var(--line);background:var(--bg-2);text-align:left;color:var(--text);
  font-size:14.5px;line-height:1.45;transition:.14s;width:100%}
.opt:hover{border-color:var(--cyan);background:var(--panel-2)}
.opt .key{font-family:var(--font-m);font-size:12px;font-weight:600;color:var(--text-faint);
  width:24px;height:24px;border-radius:6px;border:1px solid var(--line);flex:none;
  display:flex;align-items:center;justify-content:center;transition:.14s}
.opt:hover .key{color:var(--cyan);border-color:var(--cyan)}
.opt.chosen{border-color:var(--amber);background:var(--amber-soft)}
.opt.chosen .key{background:var(--amber);color:#1a1204;border-color:var(--amber)}
.opt.correct{border-color:var(--green);background:rgba(91,217,140,.10)}
.opt.correct .key{background:var(--green);color:#06210f;border-color:var(--green)}
.opt.wrong{border-color:var(--red);background:rgba(255,110,110,.09)}
.opt.wrong .key{background:var(--red);color:#2b0808;border-color:var(--red)}
.exam-foot{padding:22px 34px;border-top:1px solid var(--line-soft);display:flex;
  align-items:center;justify-content:space-between;gap:14px}

/* result */
.result{text-align:center;padding:44px 34px}
.result .score-ring{width:170px;height:170px;margin:0 auto 22px}
.result h2{font-family:var(--font-d);font-weight:700;font-size:34px;margin-bottom:8px}
.result .verdict{font-family:var(--font-m);font-size:13px;letter-spacing:.14em;text-transform:uppercase;margin-bottom:22px}
.result.pass .verdict{color:var(--green)} .result.fail .verdict{color:var(--red)}
.result p{color:var(--text-dim);max-width:440px;margin:0 auto 26px;font-size:14.5px}
.cert-form{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:14px}
.cert-form input{font-family:var(--font-b);font-size:14px;padding:11px 15px;border-radius:9px;
  border:1px solid var(--line);background:var(--bg-2);color:var(--text);min-width:240px}
.cert-form input:focus{border-color:var(--cyan);outline:none}
.result-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:8px}

/* ============ FOOTER ============ */
footer{border-top:1px solid var(--line-soft);padding:34px 0 46px;margin-top:40px}
.foot-in{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.foot-in .brand small{color:var(--text-faint)}
footer p{font-family:var(--font-m);font-size:11px;color:var(--text-faint);letter-spacing:.04em}

/* toast */
.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--panel-2);border:1px solid var(--cyan);color:var(--text);
  padding:12px 20px;border-radius:10px;font-family:var(--font-m);font-size:12.5px;
  box-shadow:var(--shadow);z-index:200;opacity:0;pointer-events:none;transition:.25s}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* hidden util for canvas */
#cardCanvas,#certCanvas{position:fixed;left:-99999px;top:0}

/* ============ RESPONSIVE ============ */
@media(max-width:860px){
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .mascot-panel{max-width:340px;margin:0 auto;order:-1}
  .stats{gap:22px}
  .level-side .mini-bar{display:none}
  .level-meta p{white-space:normal}
}
@media(max-width:560px){
  .wrap{padding:0 16px}
  .bar-in{gap:10px}
  .brand small{display:none}
  .clearance{display:none}
  .hero{padding:48px 0 40px}
  .stats{flex-wrap:wrap;gap:18px 30px}
  .level-head{padding:18px 16px;gap:14px}
  .level-num{width:48px;height:48px;font-size:19px}
  .topics-in{grid-template-columns:1fr}
  .drawer-body{padding:22px 18px}
  .exam-body,.exam-hd,.exam-foot{padding-left:20px;padding-right:20px}
}
/* ============ TOP BAR: track context (only shown inside a track) ============ */
.bar-track{display:none;align-items:center;gap:8px;font-family:var(--font-m);font-size:12px;color:var(--text)}
.bar-track .bt-dot{width:7px;height:7px;border-radius:50%;background:var(--amber);box-shadow:0 0 8px var(--amber);flex:none}
.bar-track b{color:var(--text);font-weight:600;letter-spacing:.02em}
.clearance{display:none}
.bar-exam-btn{display:none}
body.in-track .bar-track{display:flex}
body.in-track .clearance{display:flex}
body.in-track .bar-exam-btn{display:inline-flex}

/* ============ HUB (track picker) ============ */
.hub-hero{padding:64px 0 66px}
.hub-top{text-align:center;max-width:700px;margin:0 auto}
.hub-byte{width:98px !important;height:98px !important;display:block;margin:0 auto 16px !important}
.hub-top h1{font-family:var(--font-d);font-weight:700;font-size:clamp(34px,5.2vw,56px);
  line-height:1.03;letter-spacing:-.02em;margin:12px 0 18px}
.hub-top .lead{font-size:16.5px;color:var(--text-dim);max-width:560px;margin:0 auto}
.track-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px;
  margin-top:46px;max-width:900px;margin-left:auto;margin-right:auto}
.track-card{position:relative;overflow:hidden;text-align:left;padding:28px 26px 24px;
  border:1px solid var(--line);border-radius:18px;background:linear-gradient(165deg,var(--panel),var(--bg-2));
  color:var(--text);transition:.2s;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:12px}
.track-card:hover{border-color:var(--amber);transform:translateY(-3px)}
.track-card .tc-glow{position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .25s;
  background:radial-gradient(280px 160px at 80% -10%,rgba(255,194,75,.14),transparent 70%)}
.track-card:hover .tc-glow{opacity:1}
.tc-head{display:flex;flex-direction:column;gap:4px}
.tc-name{font-family:var(--font-d);font-weight:600;font-size:23px;letter-spacing:-.01em}
.tc-short{font-family:var(--font-m);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--text-faint)}
.tc-blurb{color:var(--text-dim);font-size:13.5px;line-height:1.6;flex:1}
.tc-meta{font-family:var(--font-m);font-size:11px;color:var(--text-faint);letter-spacing:.04em}
.tc-prog{display:flex;align-items:center;gap:12px}
.tc-prog .mini-bar{width:auto;flex:1}
.tc-prog span{font-family:var(--font-m);font-size:10.5px;color:var(--text-dim);white-space:nowrap}
.tc-cta{font-family:var(--font-m);font-size:12px;font-weight:500;letter-spacing:.06em;color:var(--amber);
  text-transform:uppercase;margin-top:4px}
.track-card:hover .tc-cta{color:#ffcf6c}

/* learn-view hero title */
#heroTitle{color:#fff;text-shadow:0 0 30px rgba(255,194,75,.22)}

/* ============ DRAWER: enlarged for focus ============ */
.drawer-body{padding:30px 30px 36px}
.drawer-body h2{font-size:33px}
.drawer-body .tag{font-size:16.5px;margin:9px 0 28px}
.block{margin-bottom:26px}
.block .lbl{font-size:11.5px}
.block p{font-size:15.5px;line-height:1.78}
.li-text{font-size:14.5px;line-height:1.72;max-height:none}
.drawer-top{padding:22px 30px}
.drawer-foot{padding:18px 30px}

/* ============ EXAM: answer review (revealed at the end) ============ */
.review{margin-top:36px;text-align:left;border-top:1px solid var(--line-soft);padding-top:26px}
.review-hd{font-family:var(--font-m);font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-dim);margin-bottom:18px}
.review-hd b{color:var(--amber)}
.rev-q{border:1px solid var(--line-soft);border-radius:12px;padding:16px 18px;margin-bottom:12px;background:var(--bg-2)}
.rev-q.ok{border-color:rgba(91,217,140,.3)}
.rev-q.no{border-color:rgba(255,110,110,.3)}
.rev-qtext{font-family:var(--font-d);font-weight:500;font-size:15px;line-height:1.4;margin-bottom:12px}
.rev-ix{font-family:var(--font-m);font-size:12px;margin-right:7px}
.rev-q.ok .rev-ix{color:var(--green)}
.rev-q.no .rev-ix{color:var(--red)}
.rev-opts{display:flex;flex-direction:column;gap:7px}
.rev-opt{display:flex;align-items:center;gap:10px;font-size:13.5px;color:var(--text-dim);
  padding:9px 11px;border-radius:8px;border:1px solid transparent}
.rev-opt .rk{font-family:var(--font-m);font-size:11px;color:var(--text-faint);width:18px;flex:none}
.rev-opt .rm{margin-left:auto;font-weight:700}
.rev-opt.correct{background:rgba(91,217,140,.10);color:var(--text);border-color:rgba(91,217,140,.35)}
.rev-opt.correct .rm{color:var(--green)}
.rev-opt.wrong{background:rgba(255,110,110,.09);color:var(--text);border-color:rgba(255,110,110,.35)}
.rev-opt.wrong .rm{color:var(--red)}

/* ============ RESPONSIVE (additions) ============ */
@media(max-width:860px){
  .track-cards{grid-template-columns:1fr;max-width:460px}
  .drawer-body h2{font-size:29px}
}
@media(max-width:560px){
  body.in-track .clearance,body.in-track .bar-track{display:none}
  .brand b{display:none}
  .brand{min-width:0}
  .bar-exam-btn{padding:9px 12px;font-size:11px}
  .hub-hero{padding:44px 0 46px}
  .drawer-body{padding:24px 20px 30px}
  .drawer-top,.drawer-foot{padding-left:20px;padding-right:20px}
  .drawer-body h2{font-size:26px}
  .rev-opt{font-size:13px}
}

/* ============ CROSS-TRACK SEARCH ============ */
.search{position:relative;display:flex;align-items:center;gap:8px;width:min(300px,32vw);
  background:var(--bg-2);border:1px solid var(--line);border-radius:9px;padding:0 12px;height:38px;transition:.16s}
.search:focus-within{border-color:var(--cyan)}
.search-ic{color:var(--text-faint);font-size:16px;flex:none;line-height:1}
.search input{flex:1;min-width:0;background:none;border:none;outline:none;color:var(--text);
  font-family:var(--font-b);font-size:13.5px}
.search input::placeholder{color:var(--text-faint)}
.search-results{position:absolute;top:calc(100% + 8px);right:0;width:min(440px,88vw);max-height:64vh;
  overflow-y:auto;background:var(--panel);border:1px solid var(--line);border-radius:12px;
  box-shadow:var(--shadow);padding:6px;display:none;z-index:60}
.search-results.show{display:block}
.sr-item{display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:10px 11px;
  border-radius:9px;border:1px solid transparent;background:none;color:var(--text);transition:.12s}
.sr-item:hover{background:var(--bg-2);border-color:var(--line)}
.sr-badge{font-family:var(--font-m);font-size:9.5px;letter-spacing:.06em;text-transform:uppercase;
  padding:4px 8px;border-radius:6px;flex:none;font-weight:600;white-space:nowrap}
.sr-backend{background:var(--amber-soft);color:var(--amber)}
.sr-frontend{background:var(--cyan-soft);color:var(--cyan)}
.sr-txt{min-width:0}
.sr-txt b{display:block;font-weight:600;font-size:13.5px;font-family:var(--font-d)}
.sr-txt small{display:block;font-family:var(--font-m);font-size:10.5px;color:var(--text-faint);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sr-empty{padding:14px 12px;color:var(--text-dim);font-size:13px;font-family:var(--font-m)}

/* ============ STACK OF THE DAY (highlighted) ============ */
.stack-day{max-width:760px;margin:48px auto 4px}
.sd-label{display:flex;align-items:center;justify-content:center;gap:9px;
  font-family:var(--font-m);font-size:12.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--amber);font-weight:600;margin-bottom:14px}
.sd-pulse{width:9px;height:9px;border-radius:50%;background:var(--amber);
  box-shadow:0 0 0 0 rgba(255,194,75,.6);animation:sdpulse 2s infinite}
@keyframes sdpulse{
  0%{box-shadow:0 0 0 0 rgba(255,194,75,.55)}
  70%{box-shadow:0 0 0 13px rgba(255,194,75,0)}
  100%{box-shadow:0 0 0 0 rgba(255,194,75,0)}
}
.sd-card{position:relative;overflow:hidden;display:flex;align-items:center;justify-content:space-between;
  gap:22px;width:100%;text-align:left;padding:28px 32px;border-radius:18px;
  border:1.5px solid var(--amber-dim);color:var(--text);transition:.22s;
  background:linear-gradient(150deg,rgba(255,194,75,.09),var(--panel-2) 55%,var(--bg-2));
  box-shadow:0 0 0 1px rgba(255,194,75,.12),0 22px 52px -18px rgba(255,194,75,.35),var(--shadow)}
.sd-card::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(360px 180px at 88% -20%,rgba(63,224,208,.18),transparent 70%)}
.sd-card:hover{transform:translateY(-3px);border-color:var(--amber)}
.sd-flag{position:absolute;top:0;right:0;font-family:var(--font-m);font-size:9.5px;font-weight:600;
  letter-spacing:.12em;text-transform:uppercase;color:#1a1204;background:var(--amber);
  padding:5px 12px;border-bottom-left-radius:12px}
.sd-main{min-width:0;position:relative;z-index:1}
.sd-track{display:block;font-family:var(--font-m);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--text-dim);margin-bottom:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sd-title{display:block;font-family:var(--font-d);font-weight:700;font-size:28px;letter-spacing:-.015em;line-height:1.1}
.sd-tag{display:block;color:var(--cyan);font-style:italic;font-size:15px;margin-top:5px}
.sd-cta{position:relative;z-index:1;font-family:var(--font-m);font-size:12px;font-weight:600;letter-spacing:.06em;
  text-transform:uppercase;color:var(--amber);white-space:nowrap;flex:none}
.sd-card:hover .sd-cta{color:#ffcf6c}

@media(max-width:560px){
  .search{width:38vw}
  .sd-card{flex-direction:column;align-items:flex-start;gap:12px;padding:20px 20px 22px}
  .sd-flag{position:static;align-self:flex-start;border-radius:6px;order:-1;padding:5px 10px}
  .sd-title{font-size:21px}
  .sd-cta{align-self:flex-end}
}

/* ============ MOBILE SCROLL PERFORMANCE ============
   Fixed full-screen gradient layers + backdrop blur repaint on every scroll
   frame as the mobile address bar resizes the viewport, causing jitter.
   On phones/tablets: drop the fixed layers, paint a lightweight grid that
   scrolls with the page, and make the sticky header solid (no live blur). */
@media(max-width:768px){
  body::before,body::after{display:none}
  body{
    background-color:var(--bg);
    background-image:
      linear-gradient(var(--line-soft) 1px,transparent 1px),
      linear-gradient(90deg,var(--line-soft) 1px,transparent 1px);
    background-size:46px 46px;
  }
  header.bar{backdrop-filter:none;-webkit-backdrop-filter:none;background:rgba(8,12,22,.97)}
  .scrim{backdrop-filter:none;-webkit-backdrop-filter:none}
}

/* ============ MOBILE: briefing as a bottom sheet ============
   A side drawer is awkward on phones. On small screens the briefing becomes a
   bottom sheet: full width, slides up from the bottom, rounded top, with a
   drag handle you can swipe down to dismiss (see app.js). */
@media(max-width:768px){
  body.sheet-open{overflow:hidden}
  .drawer{
    top:auto;left:0;right:0;bottom:0;width:100%;
    height:88vh;height:88dvh;max-height:88dvh;
    border-left:none;border-top:1px solid var(--line);
    border-radius:20px 20px 0 0;
    transform:translateY(100%);
    box-shadow:0 -20px 50px -20px rgba(0,0,0,.7);
  }
  .drawer.show{transform:translateY(0)}
  .drawer::before{content:"";flex:none;width:44px;height:5px;border-radius:3px;
    background:var(--line);margin:10px auto 0}
  .drawer-top{padding-top:12px}
  .drawer-body{overflow-x:hidden;overscroll-behavior:contain}
  .li-text,.block p,.drawer-body h2,.drawer-body .tag{overflow-wrap:anywhere}
}

/* ============ PROMPT OPTIMIZER ============ */
.bar-tool-btn{white-space:nowrap}
.opt-scrim{position:fixed;inset:0;z-index:110;background:rgba(4,7,13,.72);backdrop-filter:blur(4px);
  opacity:0;pointer-events:none;transition:opacity .25s}
.opt-scrim.show{opacity:1;pointer-events:auto}
.opt-modal{position:fixed;z-index:111;left:50%;top:50%;transform:translate(-50%,-48%) scale(.98);
  opacity:0;pointer-events:none;width:min(760px,94vw);max-height:90vh;display:flex;flex-direction:column;
  background:var(--bg-2);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);
  transition:opacity .25s,transform .25s}
.opt-modal.show{opacity:1;pointer-events:auto;transform:translate(-50%,-50%) scale(1)}
.opt-head{display:flex;align-items:center;gap:14px;padding:18px 22px;border-bottom:1px solid var(--line-soft);flex:none}
.opt-brand{display:flex;align-items:center;gap:12px;flex:1;min-width:0}
.opt-brand svg{width:38px;height:38px;flex:none}
.opt-brand b{font-family:var(--font-d);font-weight:600;font-size:18px}
.opt-body{overflow-y:auto;overscroll-behavior:contain;padding:20px 22px 26px}
.opt-quip{font-family:var(--font-m);font-size:12.5px;color:var(--cyan);margin-bottom:16px;line-height:1.6}
.opt-lbl{font-family:var(--font-m);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-dim);margin:18px 0 8px;display:flex;align-items:center;gap:10px}
.opt-lbl:first-of-type{margin-top:0}
.opt-hint{font-size:10px;letter-spacing:.04em;text-transform:none;color:var(--text-faint);font-weight:400}
.opt-input{width:100%;background:var(--bg);border:1px solid var(--line);border-radius:10px;color:var(--text);
  font-family:var(--font-b);font-size:14px;line-height:1.6;padding:13px 15px;resize:vertical;min-height:120px}
.opt-input:focus{outline:none;border-color:var(--cyan)}
.opt-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.opt-passes{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:10px}
.opt-pass{display:flex;align-items:center;gap:11px;padding:12px 14px;border-radius:10px;
  border:1px solid var(--line-soft);background:var(--bg-2);color:var(--text-dim);text-align:left;transition:.15s}
.opt-pass:hover{border-color:var(--line)}
.opt-pass .pass-check{width:17px;height:17px;border-radius:5px;border:1.5px solid var(--line);flex:none;position:relative;transition:.15s}
.opt-pass.on{border-color:var(--amber-dim);color:var(--text)}
.opt-pass.on .pass-check{background:var(--amber);border-color:var(--amber)}
.opt-pass.on .pass-check::after{content:"✓";position:absolute;inset:0;display:flex;align-items:center;
  justify-content:center;font-size:11px;color:#1a1204;font-weight:700;font-family:var(--font-b)}
.pass-name{flex:1;font-size:13px;font-weight:500;font-family:var(--font-b)}
.pass-saved{font-family:var(--font-m);font-size:11px;color:var(--green)}
.opt-result{margin-top:22px;border-top:1px solid var(--line-soft);padding-top:18px}
.opt-metrics{display:flex;align-items:center;gap:26px;flex-wrap:wrap;margin-bottom:4px}
.m-hero{display:flex;flex-direction:column;line-height:1}
.m-hero b{font-family:var(--font-d);font-size:46px;font-weight:700;color:var(--amber);text-shadow:0 0 26px rgba(255,194,75,.3)}
.m-hero span{font-family:var(--font-m);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--text-faint);margin-top:5px}
.m-row{display:flex;gap:22px}
.m-stat{display:flex;flex-direction:column}
.m-stat b{font-family:var(--font-d);font-size:22px;font-weight:600}
b.m-green{color:var(--green)}
.m-stat span{font-family:var(--font-m);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--text-faint);margin-top:4px}
.m-note{width:100%;font-family:var(--font-m);font-size:10.5px;color:var(--text-faint);margin-top:4px}
.opt-legend{text-transform:none;letter-spacing:0;display:flex;gap:8px;font-size:11px}
.opt-legend i{font-style:normal;padding:1px 6px;border-radius:4px}
.opt-diff{background:var(--bg);border:1px solid var(--line-soft);border-radius:10px;padding:14px 16px;
  font-size:14px;line-height:1.95;color:var(--text-dim);max-height:220px;overflow-y:auto;overflow-wrap:anywhere}
.d-del{color:var(--red);text-decoration:line-through;opacity:.85}
.d-add{color:var(--green);background:rgba(91,217,140,.10);border-radius:3px;padding:0 3px}
.opt-empty{color:var(--text-faint);font-family:var(--font-m);font-size:12px}
.opt-out{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px 16px;font-size:14px;
  line-height:1.6;white-space:pre-wrap;color:var(--text);overflow-wrap:anywhere;max-height:220px;overflow-y:auto}

@media(max-width:560px){
  .bar-tool-btn .btn-label{display:none}
  .bar-tool-btn{padding:9px 11px}
}
@media(max-width:768px){
  .opt-modal{left:0;right:0;top:auto;bottom:0;width:100%;max-width:100%;max-height:92vh;max-height:92dvh;
    transform:translateY(100%);border-radius:20px 20px 0 0}
  .opt-modal.show{transform:translateY(0)}
  .m-hero b{font-size:40px}
}

/* ============ TRACKS / TOOLS NAV + TOOLS PAGE ============ */
.bar-nav{display:flex;gap:4px}
.nav-item{font-family:var(--font-m);font-size:12px;letter-spacing:.06em;text-transform:uppercase;
  padding:8px 14px;border-radius:8px;border:1px solid transparent;background:none;color:var(--text-dim);transition:.15s}
.nav-item:hover{color:var(--text)}
.nav-item.active{color:var(--amber);border-color:var(--amber-dim);background:var(--amber-soft)}

.tools-head{max-width:640px}
.tools-head h1{font-family:var(--font-d);font-weight:700;font-size:clamp(30px,4.5vw,48px);
  line-height:1.05;letter-spacing:-.02em;margin:12px 0 14px}
.tools-head .lead{color:var(--text-dim);font-size:16px;max-width:560px}
.tool-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:36px}
.tool-card{display:flex;flex-direction:column;gap:9px;text-align:left;padding:20px;border-radius:14px;
  border:1px solid var(--line);background:var(--panel);color:var(--text);transition:.18s}
.tool-card:hover{border-color:var(--cyan);transform:translateY(-2px)}
.tool-icon{font-family:var(--font-m);font-size:19px;color:var(--amber);width:40px;height:40px;border-radius:10px;
  display:flex;align-items:center;justify-content:center;background:var(--amber-soft);border:1px solid var(--amber-dim)}
.tool-name{font-family:var(--font-d);font-weight:600;font-size:16px}
.tool-blurb{color:var(--text-dim);font-size:13px;line-height:1.5}

.tool-input{width:100%;background:var(--bg);border:1px solid var(--line);border-radius:10px;color:var(--text);
  font-family:var(--font-m);font-size:13px;line-height:1.6;padding:12px 14px;resize:vertical;min-height:80px}
.tool-input:focus{outline:none;border-color:var(--cyan)}
.tool-actions{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}
.tool-out{background:var(--bg);border:1px solid var(--line-soft);border-radius:10px;padding:14px 16px;
  font-family:var(--font-m);font-size:13px;line-height:1.6;white-space:pre-wrap;color:var(--text);
  overflow-wrap:anywhere;min-height:44px;max-height:300px;overflow-y:auto}
.tool-note{font-family:var(--font-m);font-size:10.5px;color:var(--text-faint);margin-top:10px;line-height:1.5}
.tool-file{display:block;width:100%;font-family:var(--font-m);font-size:12.5px;color:var(--text-dim);
  background:var(--bg);border:1px dashed var(--line);border-radius:10px;padding:12px 14px}
.tool-file::file-selector-button{font-family:var(--font-m);font-size:11px;letter-spacing:.06em;text-transform:uppercase;
  background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:7px;padding:7px 12px;margin-right:10px;cursor:pointer;transition:.15s}
.tool-file::file-selector-button:hover{border-color:var(--amber);color:var(--amber)}

@media(max-width:560px){
  .nav-item{padding:7px 9px;font-size:11px;letter-spacing:.02em}
}

@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;transition-duration:.001ms!important}
  html{scroll-behavior:auto}
}