/* ============================================================
   ROOTLINE — design system
   ============================================================ */
:root{
  --bg:#06090b;
  --bg-2:#080d10;
  --panel:#0c1216;
  --panel-2:#0f171c;
  --panel-3:#131d23;
  --line:#1b262d;
  --line-2:#26343d;
  --text:#e6eef1;
  --text-2:#b7c6cc;
  --muted:#7d9099;
  --green:#6ef2a4;
  --green-2:#35d07f;
  --green-soft:rgba(110,242,164,.1);
  --cyan:#5ad8ff;
  --cyan-soft:rgba(90,216,255,.1);
  --amber:#ffc861;
  --red:#ff6b7a;
  --purple:#b79cff;
  --pink:#ff8ec7;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 18px 50px -18px rgba(0,0,0,.85);
  --font:'Space Grotesk',ui-sans-serif,system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sidebar:248px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font);font-size:15px;line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  min-height:100vh;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(900px 520px at 12% -8%, rgba(110,242,164,.075), transparent 60%),
    radial-gradient(760px 480px at 105% 4%, rgba(90,216,255,.055), transparent 62%),
    radial-gradient(700px 500px at 50% 110%, rgba(183,156,255,.05), transparent 65%);
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.35;
  background-image:linear-gradient(rgba(255,255,255,.026) 1px, transparent 1px),
                   linear-gradient(90deg, rgba(255,255,255,.026) 1px, transparent 1px);
  background-size:46px 46px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 85%);
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 85%);
}
.noise{position:fixed;inset:0;z-index:9999;pointer-events:none;opacity:.022;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='.6'/%3E%3C/svg%3E");}
a{color:inherit;text-decoration:none}
button{font-family:inherit;color:inherit}
::selection{background:rgba(110,242,164,.28);color:#fff}
:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:6px}
img,svg{display:block}
/* fallback size for unclassed inline icons (icon() helper omits width/height) */
:where(svg:not([width]):not([height])){width:16px;height:16px;flex:0 0 auto}
h1,h2,h3,h4{margin:0;font-weight:600;letter-spacing:-.02em;line-height:1.2}
p{margin:0}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:#1e2a31;border-radius:8px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:#2b3b44}

/* ---------- app layout ---------- */
.shell{display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr);min-height:100vh}
.sidebar{
  position:sticky;top:0;height:100vh;display:flex;flex-direction:column;
  border-right:1px solid var(--line);background:rgba(7,11,13,.72);
  backdrop-filter:blur(14px);z-index:40;
}
.brand{display:flex;align-items:center;gap:11px;padding:22px 20px 18px}
.brand-mark{width:38px;height:38px;flex:0 0 auto;border-radius:11px;
  background:linear-gradient(150deg,rgba(110,242,164,.18),rgba(90,216,255,.06));
  border:1px solid rgba(110,242,164,.28);display:grid;place-items:center;
  box-shadow:0 0 22px -6px rgba(110,242,164,.45)}
.brand>span:last-child{display:flex;flex-direction:column;min-width:0}
.brand-name{display:block;font-weight:700;letter-spacing:.18em;font-size:15px;line-height:1;white-space:nowrap}
.brand-name span{color:var(--green)}
.brand-sub{font-family:var(--mono);font-size:9.5px;letter-spacing:.22em;color:var(--muted);margin-top:5px;text-transform:uppercase}
.nav{padding:8px 12px;display:flex;flex-direction:column;gap:2px}
.nav-label{font-family:var(--mono);font-size:9.5px;letter-spacing:.2em;color:#5c6f78;padding:16px 10px 7px;text-transform:uppercase}
.nav-item{display:flex;align-items:center;gap:11px;padding:9px 11px;border-radius:9px;
  color:var(--text-2);font-size:13.5px;font-weight:500;border:1px solid transparent;transition:.16s;position:relative}
.nav-item svg{width:17px;height:17px;opacity:.75;flex:0 0 auto}
.nav-item:hover{background:rgba(255,255,255,.035);color:var(--text)}
.nav-item.active{background:var(--green-soft);border-color:rgba(110,242,164,.16);color:var(--green)}
.nav-item.active svg{opacity:1}
.nav-item.active::before{content:"";position:absolute;left:-12px;top:50%;transform:translateY(-50%);
  width:3px;height:17px;border-radius:0 3px 3px 0;background:var(--green);box-shadow:0 0 12px var(--green)}
.nav-badge{margin-left:auto;font-family:var(--mono);font-size:9px;padding:2px 6px;border-radius:20px;
  background:rgba(255,255,255,.06);color:var(--muted);border:1px solid var(--line)}
.sidebar-foot{margin-top:auto;padding:14px;border-top:1px solid var(--line)}
.side-card{border:1px solid var(--line);background:linear-gradient(160deg,rgba(110,242,164,.06),transparent 70%);
  border-radius:11px;padding:12px}
.side-card-row{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:8px}
.side-card-title{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-family:var(--mono)}
.side-card-xp{font-family:var(--mono);font-size:11px;color:var(--green)}
.side-card-rank{font-size:13.5px;font-weight:600}
.side-card-next{font-size:11px;color:var(--muted);margin-top:3px}

.main{min-width:0;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:14px;
  padding:14px 30px;border-bottom:1px solid var(--line);
  background:rgba(6,9,11,.76);backdrop-filter:blur(16px)}
.topbar-title{font-size:13px;color:var(--muted);font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:340px;flex:0 1 auto}
.topbar-spacer{flex:1}
.search-btn{display:flex;align-items:center;gap:9px;min-width:210px;padding:8px 11px;border-radius:9px;
  background:rgba(255,255,255,.032);border:1px solid var(--line);color:var(--muted);font-size:12.5px;cursor:pointer;transition:.16s}
.search-btn:hover{border-color:var(--line-2);background:rgba(255,255,255,.05);color:var(--text-2)}
.search-btn kbd{font-family:var(--mono);font-size:10px;padding:2px 5px;border-radius:5px;background:#131d23;border:1px solid var(--line-2);color:var(--muted)}
.search-btn .grow{flex:1;text-align:left}
.chip{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:8px;
  border:1px solid var(--line);background:rgba(255,255,255,.028);font-size:12px;font-family:var(--mono);color:var(--text-2);white-space:nowrap}
.chip svg{width:14px;height:14px}
.chip.xp{color:var(--green);border-color:rgba(110,242,164,.22);background:var(--green-soft)}
.chip.streak{color:var(--amber);border-color:rgba(255,200,97,.2);background:rgba(255,200,97,.08)}
.avatar{width:33px;height:33px;border-radius:9px;border:1px solid var(--line-2);background:linear-gradient(150deg,#1a2b24,#101a20);
  display:grid;place-items:center;font-family:var(--mono);font-size:12px;color:var(--green);cursor:pointer;font-weight:700}
.content{padding:30px;max-width:1280px;width:100%;margin:0 auto;flex:1}
.mobile-nav{display:none}

/* ---------- primitives ---------- */
.card{background:linear-gradient(180deg,var(--panel-2),var(--panel));border:1px solid var(--line);
  border-radius:var(--radius);position:relative;overflow:hidden}
.card.pad{padding:22px}
.card.hover{transition:.2s ease}
.card.hover:hover{transform:translateY(-2px);border-color:#2a3a43;box-shadow:var(--shadow)}
.eyebrow{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.muted{color:var(--muted)}
.dim{color:#6b7f88}
.mono{font-family:var(--mono)}
.green{color:var(--green)}
.cyan{color:var(--cyan)}
.amber{color:var(--amber)}
.red{color:var(--red)}
.purple{color:var(--purple)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;border-radius:9px;
  border:1px solid var(--line-2);background:rgba(255,255,255,.04);color:var(--text);font-size:13px;font-weight:600;
  cursor:pointer;transition:.16s;white-space:nowrap}
.btn:hover{background:rgba(255,255,255,.075);border-color:#36474f}
.btn svg{width:15px;height:15px}
.btn.primary{background:linear-gradient(180deg,#7bf7af,#4bdc8c);color:#04120b;border-color:#7bf7af;
  box-shadow:0 6px 24px -10px rgba(110,242,164,.75)}
.btn.primary:hover{filter:brightness(1.06);box-shadow:0 8px 30px -8px rgba(110,242,164,.7)}
.btn.ghost{background:transparent}
.btn.sm{padding:7px 11px;font-size:12px;border-radius:7px}
.btn.lg{padding:13px 22px;font-size:14px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.block{width:100%}
.icon-btn{width:33px;height:33px;display:grid;place-items:center;border-radius:8px;border:1px solid var(--line);
  background:rgba(255,255,255,.03);color:var(--muted);cursor:pointer;transition:.16s}
.icon-btn:hover{color:var(--text);border-color:var(--line-2)}
.icon-btn svg{width:16px;height:16px}
.tag{display:inline-flex;align-items:center;gap:5px;font-family:var(--mono);font-size:10px;letter-spacing:.06em;
  padding:3px 7px;border-radius:5px;background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--muted);text-transform:lowercase}
.tag.dot::before{content:"";width:5px;height:5px;border-radius:50%;background:currentColor}
.tag.easy{color:var(--green);border-color:rgba(110,242,164,.25);background:var(--green-soft)}
.tag.medium{color:var(--amber);border-color:rgba(255,200,97,.22);background:rgba(255,200,97,.07)}
.tag.hard{color:var(--red);border-color:rgba(255,107,122,.22);background:rgba(255,107,122,.07)}
.tag.insane{color:var(--purple);border-color:rgba(183,156,255,.25);background:rgba(183,156,255,.08)}
.tag.elite{color:var(--pink);border-color:rgba(255,142,199,.25);background:rgba(255,142,199,.08)}
.tag.expert{color:#ffa07a;border-color:rgba(255,160,122,.25);background:rgba(255,160,122,.08)}
.tag.alllevels{color:var(--purple);border-color:rgba(183,156,255,.25);background:rgba(183,156,255,.08)}
.tag.beginner{color:var(--cyan);border-color:rgba(90,216,255,.22);background:var(--cyan-soft)}
.divider{height:1px;background:var(--line);margin:22px 0}
.progress{height:6px;background:#101920;border-radius:20px;overflow:hidden;border:1px solid rgba(255,255,255,.03)}
.progress > span{display:block;height:100%;border-radius:20px;background:linear-gradient(90deg,var(--green-2),var(--green));
  box-shadow:0 0 14px rgba(110,242,164,.5);transition:width .6s cubic-bezier(.2,.7,.2,1)}
.progress.thin{height:4px}
.progress.cyan > span{background:linear-gradient(90deg,#2aa8cc,var(--cyan));box-shadow:0 0 14px rgba(90,216,255,.4)}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.row{display:flex;align-items:center;gap:10px}
.between{display:flex;align-items:center;justify-content:space-between;gap:14px}
.stack{display:flex;flex-direction:column;gap:14px}
.clamp-2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- page header ---------- */
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:24px;flex-wrap:wrap}
.page-title{font-size:29px;letter-spacing:-.035em}
.page-sub{color:var(--muted);font-size:13.5px;margin-top:5px;max-width:620px}
.crumbs{display:flex;align-items:center;gap:7px;font-family:var(--mono);font-size:10.5px;color:var(--muted);
  letter-spacing:.08em;text-transform:uppercase;margin-bottom:13px;flex-wrap:wrap}
.crumbs a:hover{color:var(--green)}
.crumbs .sep{opacity:.4}

/* ---------- dashboard ---------- */
.hero{display:grid;grid-template-columns:1.55fr .9fr;gap:18px;margin-bottom:18px}
.hero-main{padding:26px 28px;position:relative;overflow:hidden}
.hero-main::after{content:"";position:absolute;right:-90px;top:-110px;width:330px;height:330px;border-radius:50%;
  background:radial-gradient(circle,rgba(110,242,164,.13),transparent 65%);pointer-events:none}
.hero-greet{font-family:var(--mono);font-size:10.5px;letter-spacing:.22em;color:var(--green);text-transform:uppercase}
.hero-title{font-size:31px;margin:10px 0 8px;letter-spacing:-.04em}
.hero-text{color:var(--muted);font-size:13.5px;max-width:430px}
.hero-cta{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}
.hero-side{padding:22px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px}
.ring-wrap{position:relative;width:132px;height:132px;margin:2px 0 8px}
.ring-wrap svg{transform:rotate(-90deg)}
.ring-center{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.ring-xp{font-family:var(--mono);font-size:21px;font-weight:700;line-height:1}
.ring-lbl{font-family:var(--mono);font-size:9px;letter-spacing:.18em;color:var(--muted);margin-top:5px}
.rank-name{font-size:15px;font-weight:600}
.rank-next{font-size:11px;color:var(--muted);font-family:var(--mono);margin-top:2px}
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:18px}
.stat{padding:14px 16px;border-radius:11px;border:1px solid var(--line);background:rgba(255,255,255,.018)}
.stat-lbl{font-family:var(--mono);font-size:9.5px;letter-spacing:.15em;color:var(--muted);text-transform:uppercase;display:flex;align-items:center;gap:6px}
.stat-val{font-size:22px;font-weight:600;letter-spacing:-.03em;margin-top:6px;font-family:var(--mono)}
.stat-val small{font-size:11px;color:var(--muted);font-weight:400;letter-spacing:0}
.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:28px 0 13px}
.section-title{font-size:16px;font-weight:600;display:flex;align-items:center;gap:9px}
.section-title svg{width:15px;height:15px;color:var(--green)}
.link{font-size:12px;color:var(--muted);display:inline-flex;align-items:center;gap:5px;transition:.15s}
.link:hover{color:var(--green)}
.link svg{width:13px;height:13px}

/* path cards */
.path-card{padding:18px;display:flex;flex-direction:column;gap:12px;min-height:196px}
.path-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.path-glyph{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;border:1px solid var(--line-2);
  background:rgba(255,255,255,.03);flex:0 0 auto}
.path-glyph svg{width:20px;height:20px}
.path-card h3{font-size:15.5px;margin-top:2px}
.path-card .desc{font-size:12.5px;color:var(--muted);line-height:1.55}
.path-meta{display:flex;gap:6px;flex-wrap:wrap;margin-top:auto}
.path-foot{display:flex;align-items:center;justify-content:space-between;gap:10px;font-family:var(--mono);font-size:10.5px;color:var(--muted)}

/* room list rows */
.room-row{display:flex;align-items:center;gap:14px;padding:13px 15px;border:1px solid var(--line);border-radius:11px;
  background:rgba(255,255,255,.017);transition:.16s}
.room-row:hover{border-color:#2b3b45;background:rgba(255,255,255,.032);transform:translateX(2px)}
.room-ico{width:34px;height:34px;border-radius:9px;display:grid;place-items:center;flex:0 0 auto;
  background:rgba(110,242,164,.07);border:1px solid rgba(110,242,164,.14);color:var(--green)}
.room-ico svg{width:16px;height:16px}
.room-ico.done{background:rgba(110,242,164,.16);border-color:rgba(110,242,164,.35)}
.room-main{min-width:0;flex:1}
.room-name{font-size:13.5px;font-weight:500;display:flex;align-items:center;gap:8px}
.room-sub{font-size:11.5px;color:var(--muted);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.room-right{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.room-xp{font-family:var(--mono);font-size:10.5px;color:var(--green)}
.mini-ring{width:26px;height:26px}

/* ---------- path detail ---------- */
.path-hero{padding:26px 28px;margin-bottom:18px;position:relative;overflow:hidden}
.path-hero::before{content:"";position:absolute;inset:0;
  background:linear-gradient(120deg,rgba(110,242,164,.07),transparent 55%);pointer-events:none}
.path-hero .titles{max-width:640px}
.path-hero h1{font-size:30px;letter-spacing:-.04em;margin:7px 0 8px}
.path-hero p{color:var(--muted);font-size:13.5px;max-width:600px}
.hero-stats{display:flex;gap:22px;margin-top:18px;flex-wrap:wrap}
.hero-stat{font-family:var(--mono);font-size:10.5px;color:var(--muted);letter-spacing:.06em}
.hero-stat b{display:block;font-family:var(--font);font-size:17px;color:var(--text);letter-spacing:-.02em;margin-top:2px;font-weight:600}
.outcome{border-left:2px solid rgba(110,242,164,.4);padding:2px 0 2px 12px;font-size:12.5px;color:var(--text-2)}

/* ---------- room ---------- */
.room-head{padding:24px 26px;margin-bottom:18px}
.room-head .titles{max-width:760px}
.room-head h1{font-size:28px;letter-spacing:-.04em;margin:6px 0 8px}
.room-head p{color:var(--muted);font-size:13.5px}
.room-tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:16px 0 18px;overflow-x:auto}
.tab{padding:9px 14px;font-size:12.5px;color:var(--muted);border-bottom:2px solid transparent;cursor:pointer;
  background:none;border-top:none;border-left:none;border-right:none;white-space:nowrap;font-weight:500;display:flex;align-items:center;gap:7px}
.tab:hover{color:var(--text)}
.tab.active{color:var(--green);border-bottom-color:var(--green)}
.tab .count{font-family:var(--mono);font-size:9.5px;padding:1px 5px;border-radius:4px;background:rgba(255,255,255,.06)}
.room-layout{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(310px,.95fr);gap:18px;align-items:start}
.lesson{padding:24px 26px}
.lesson h2{font-size:17px;margin:26px 0 9px;display:flex;align-items:center;gap:9px;letter-spacing:-.02em}
.lesson h2:first-child{margin-top:0}
.lesson h2 .num{font-family:var(--mono);font-size:10px;color:var(--green);border:1px solid rgba(110,242,164,.25);
  background:var(--green-soft);border-radius:5px;padding:2px 6px;flex:0 0 auto}
.lesson p{font-size:13.5px;color:var(--text-2);margin:9px 0;line-height:1.72}
.lesson ul,.lesson ol{margin:9px 0;padding-left:20px;font-size:13.5px;color:var(--text-2);line-height:1.72}
.lesson li{margin:4px 0}
.lesson li::marker{color:var(--green)}
.lesson code{font-family:var(--mono);font-size:11.5px;background:rgba(110,242,164,.08);border:1px solid rgba(110,242,164,.13);
  color:#c9ffdd;padding:1.5px 5px;border-radius:4px;white-space:nowrap}
.lesson pre{margin:12px 0;padding:14px 16px;border-radius:9px;background:#070d10;border:1px solid var(--line);
  overflow-x:auto;position:relative;font-size:12px;line-height:1.65;font-family:var(--mono);color:#cfe3d7}
.lesson pre code{background:none;border:none;padding:0;color:inherit;font-size:inherit;white-space:pre}
.lesson pre .c{color:#6d8790}
.lesson pre .p{color:var(--green)}
.lesson pre .k{color:var(--cyan)}
.callout{margin:14px 0;padding:13px 15px;border-radius:9px;border:1px solid rgba(90,216,255,.18);
  background:rgba(90,216,255,.05);font-size:12.5px;color:#bfe8f4;display:flex;gap:10px}
.callout svg{width:16px;height:16px;flex:0 0 auto;margin-top:1px;color:var(--cyan)}
.callout.warn{border-color:rgba(255,200,97,.2);background:rgba(255,200,97,.05);color:#f3dfb4}
.callout.warn svg{color:var(--amber)}
.callout.ethics{border-color:rgba(255,107,122,.22);background:rgba(255,107,122,.05);color:#ffc9ce}
.callout.ethics svg{color:var(--red)}
.callout b{color:inherit}
.lesson .kbd{font-family:var(--mono);font-size:10.5px;padding:1px 5px;border-radius:4px;border:1px solid var(--line-2);background:#0e161a;color:var(--muted)}
.checklist{display:flex;flex-direction:column;gap:7px;margin:10px 0}
.check-item{display:flex;gap:9px;align-items:flex-start;font-size:13px;color:var(--text-2)}
.check-item svg{width:14px;height:14px;color:var(--green);flex:0 0 auto;margin-top:3px}

/* tasks */
.tasks{padding:0;position:sticky;top:86px;max-height:calc(100vh - 104px);display:flex;flex-direction:column}
.tasks-head{padding:16px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:10px}
.tasks-title{font-size:13px;font-weight:600;display:flex;align-items:center;gap:8px}
.tasks-title svg{width:14px;height:14px;color:var(--green)}
.tasks-count{font-family:var(--mono);font-size:10px;color:var(--muted)}
.tasks-body{padding:14px;overflow-y:auto;display:flex;flex-direction:column;gap:12px}
.task{border:1px solid var(--line);border-radius:10px;background:rgba(255,255,255,.016);padding:13px;transition:.18s}
.task.solved{border-color:rgba(110,242,164,.28);background:rgba(110,242,164,.045)}
.task-top{display:flex;gap:9px;align-items:flex-start}
.task-bullet{width:18px;height:18px;border-radius:5px;border:1px solid var(--line-2);display:grid;place-items:center;
  font-family:var(--mono);font-size:9px;color:var(--muted);flex:0 0 auto;margin-top:1px}
.task.solved .task-bullet{background:var(--green);border-color:var(--green);color:#04120b;font-weight:700}
.task-bullet svg{width:11px;height:11px}
.task-q{font-size:12.5px;line-height:1.55;color:var(--text-2);flex:1}
.task.solved .task-q{color:var(--text)}
.task-form{display:flex;gap:6px;margin-top:10px}
.task-input{flex:1;min-width:0;padding:8px 10px;border-radius:7px;border:1px solid var(--line-2);background:#070c0f;
  color:var(--text);font-family:var(--mono);font-size:11.5px;outline:none;transition:.15s}
.task-input:focus{border-color:rgba(110,242,164,.5);box-shadow:0 0 0 3px rgba(110,242,164,.08)}
.task-input::placeholder{color:#4d6069}
.task-input.ok{border-color:rgba(110,242,164,.5)}
.task-input:disabled{-webkit-text-fill-color:var(--text);opacity:1;cursor:default;
  background:rgba(110,242,164,.055);border-color:rgba(110,242,164,.28);color:var(--text)}
.task-input.bad{border-color:rgba(255,107,122,.55);animation:shake .3s}
.task.solved .task-hint-btn{display:none}
.quiz-badge{font-family:var(--mono);font-size:8px;letter-spacing:.12em;color:var(--cyan);border:1px solid rgba(90,216,255,.25);
  background:rgba(90,216,255,.07);padding:1px 4px;border-radius:4px;vertical-align:1px;margin-left:4px}
.task-form.quiz-form{flex-direction:column;align-items:stretch;gap:8px}
.task-opts{display:flex;flex-direction:column;gap:5px}
.task-opt{display:flex;gap:8px;align-items:flex-start;padding:7px 9px;border:1px solid var(--line);border-radius:7px;
  cursor:pointer;font-size:11.5px;line-height:1.5;color:var(--text-2);transition:.15s;position:relative}
.task-opt:hover{border-color:var(--line-2);background:rgba(255,255,255,.03)}
.task-opt:focus-within{border-color:rgba(90,216,255,.45)}
.task-opt input{position:absolute;inset:0;width:100%;height:100%;opacity:0;margin:0;cursor:pointer}
.task-opt:has(input:checked){border-color:rgba(110,242,164,.38);background:rgba(110,242,164,.055);color:var(--text)}
.task-opt .opt-key{width:16px;height:16px;border-radius:4px;border:1px solid var(--line-2);display:grid;place-items:center;
  font-family:var(--mono);font-size:8.5px;color:var(--muted);flex:0 0 auto;margin-top:1px}
.task-opt:has(input:checked) .opt-key{border-color:rgba(110,242,164,.4);color:var(--green)}
.task-opt.correct{border-color:rgba(110,242,164,.55);background:rgba(110,242,164,.08);color:var(--text)}
.task-opt.correct .opt-key{background:var(--green);border-color:var(--green);color:#04120b;font-weight:700}
.task-opt.bad{border-color:rgba(255,107,122,.55);animation:shake .3s}
.quiz-actions{display:flex;justify-content:flex-end}
@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.task-actions{display:flex;align-items:center;gap:10px;margin-top:8px}
.task-hint-btn{background:none;border:none;padding:0;font-size:10.5px;color:var(--muted);cursor:pointer;font-family:var(--mono);display:flex;align-items:center;gap:4px}
.task-hint-btn:hover{color:var(--amber)}
.task-hint{font-size:11.5px;color:#f0d9a6;margin-top:8px;padding:8px 10px;border-radius:6px;background:rgba(255,200,97,.06);
  border:1px solid rgba(255,200,97,.15);display:none}
.task-hint.show{display:block}
.task-why{font-size:11.5px;color:#9fe8bd;margin-top:9px;padding:9px 10px;border-radius:6px;background:rgba(110,242,164,.055);
  border:1px solid rgba(110,242,164,.16);display:none}
.task-why.show{display:block}
.task-why b{color:var(--green);font-family:var(--mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;display:block;margin-bottom:3px}
.solved-chip{font-family:var(--mono);font-size:9px;letter-spacing:.12em;color:var(--green);text-transform:uppercase;display:flex;align-items:center;gap:4px}
.solved-chip svg{width:11px;height:11px}
.tasks-foot{padding:12px 14px;border-top:1px solid var(--line);font-size:10.5px;color:var(--muted);font-family:var(--mono)}

/* lab terminal */
.lab-wrap{padding:18px 20px}
.lab-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;flex-wrap:wrap}
.lab-target{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:11px;color:var(--muted)}
.dot-live{width:6px;height:6px;border-radius:50%;background:var(--green);box-shadow:0 0 8px var(--green);animation:pulse 2s infinite}
@keyframes pulse{50%{opacity:.35}}
.term{border-radius:11px;border:1px solid #1c2b32;background:#050a0c;overflow:hidden;box-shadow:inset 0 0 40px rgba(0,0,0,.5)}
.term-bar{display:flex;align-items:center;gap:7px;padding:9px 12px;background:#0a1216;border-bottom:1px solid #16242b}
.term-dot{width:9px;height:9px;border-radius:50%}
.term-dot.r{background:#ff5f57}.term-dot.y{background:#febc2e}.term-dot.g{background:#28c840}
.term-title{flex:1;text-align:center;font-family:var(--mono);font-size:10px;color:#5b727c;letter-spacing:.06em}
.term-body{padding:14px 15px;height:380px;overflow-y:auto;font-family:var(--mono);font-size:12px;line-height:1.65;color:#c3d5cd;
  scrollbar-width:thin;cursor:text;white-space:pre-wrap;word-break:break-word}
.term-body::-webkit-scrollbar-thumb{background:#1b2a31;border:none}
.term-line{white-space:pre-wrap}
.term-line.cmd{color:#e8f5ee}
.term-line .prompt{color:var(--green)}
.term-line .prompt .u{color:var(--cyan)}
.term-line .prompt .h{color:var(--purple)}
.term-line.err{color:#ff8d97}
.term-line.ok{color:var(--green)}
.term-line.dim{color:#6d8790}
.term-line.warn{color:#ffd58a}
.term-input-line{display:flex;gap:8px;align-items:baseline;white-space:pre-wrap}
.term-prompt{color:var(--green);flex:0 0 auto;white-space:pre}
.term-in{flex:1;min-width:20px;background:none;border:none;outline:none;color:#e8f5ee;font-family:var(--mono);font-size:12px;padding:0;caret-color:var(--green)}
.lab-hints{margin-top:12px;display:flex;flex-direction:column;gap:6px}
.lab-hint{display:flex;gap:8px;font-size:11.5px;color:var(--muted);align-items:flex-start}
.lab-hint code{font-family:var(--mono);color:#bfe8d2;background:rgba(110,242,164,.06);padding:1px 5px;border-radius:4px}
.lab-note{margin-top:10px;font-size:11px;color:#5f747d;display:flex;align-items:center;gap:6px}
.lab-note svg{width:12px;height:12px}

/* completion */
.complete-banner{padding:18px 20px;border-radius:12px;border:1px solid rgba(110,242,164,.35);
  background:linear-gradient(100deg,rgba(110,242,164,.14),rgba(90,216,255,.05));display:flex;gap:14px;align-items:center;margin-bottom:16px}
.complete-banner .seal{width:42px;height:42px;border-radius:50%;background:var(--green);color:#04120b;display:grid;place-items:center;flex:0 0 auto;
  box-shadow:0 0 26px rgba(110,242,164,.5)}
.complete-banner h3{font-size:15px}
.complete-banner p{font-size:12px;color:#a9c9b9;margin-top:2px}
.room-nav{display:flex;justify-content:space-between;gap:12px;margin-top:18px}

/* profile */
.profile-head{display:flex;gap:20px;align-items:center;padding:26px;flex-wrap:wrap}
.profile-avatar{width:76px;height:76px;border-radius:18px;display:grid;place-items:center;font-family:var(--mono);
  font-size:28px;font-weight:700;color:var(--green);border:1px solid rgba(110,242,164,.3);
  background:linear-gradient(150deg,rgba(110,242,164,.16),rgba(90,216,255,.05));box-shadow:0 0 40px -10px rgba(110,242,164,.4)}
.profile-name{font-size:24px;letter-spacing:-.03em}
.profile-sub{font-size:12px;color:var(--muted);font-family:var(--mono);margin-top:4px}
.profile-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:16px}
.badge-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.badge{padding:15px;border-radius:11px;border:1px solid var(--line);background:rgba(255,255,255,.018);text-align:center;transition:.18s}
.badge.locked{opacity:.38;filter:grayscale(1)}
.badge:not(.locked):hover{border-color:rgba(110,242,164,.3);transform:translateY(-2px)}
.badge-icon{width:42px;height:42px;margin:0 auto 9px;border-radius:12px;display:grid;place-items:center;
  background:rgba(110,242,164,.09);border:1px solid rgba(110,242,164,.18);color:var(--green)}
.badge-icon svg{width:21px;height:21px}
.badge-name{font-size:12px;font-weight:600}
.badge-desc{font-size:10.5px;color:var(--muted);margin-top:3px;line-height:1.4}
.heatmap{display:grid;grid-auto-flow:column;grid-template-rows:repeat(7,12px);grid-auto-columns:12px;
  justify-content:start;align-content:start;gap:3px;overflow-x:auto;padding-bottom:4px}
.hm-cell{width:12px;height:12px;border-radius:2px;background:#101a20;border:1px solid rgba(255,255,255,.02)}
.hm-cell.l1{background:rgba(110,242,164,.22)}
.hm-cell.l2{background:rgba(110,242,164,.42)}
.hm-cell.l3{background:rgba(110,242,164,.66)}
.hm-cell.l4{background:var(--green);box-shadow:0 0 8px rgba(110,242,164,.5)}
.heat-legend{display:flex;align-items:center;gap:4px;font-family:var(--mono);font-size:9px;color:var(--muted);justify-content:flex-end;margin-top:6px}
.cert-card{padding:18px;border-radius:12px;border:1px solid rgba(255,200,97,.25);
  background:linear-gradient(140deg,rgba(255,200,97,.08),rgba(255,255,255,.015));display:flex;gap:14px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.cert-card h4{font-size:13.5px}
.cert-card p{font-size:11px;color:var(--muted);margin-top:2px}
.rank-ladder{display:flex;flex-direction:column;gap:0}
.ladder-row{display:flex;align-items:center;gap:12px;padding:9px 0;border-bottom:1px dashed rgba(255,255,255,.05);font-size:12px}
.ladder-row:last-child{border-bottom:none}
.ladder-dot{width:8px;height:8px;border-radius:50%;background:#233039;flex:0 0 auto}
.ladder-row.current .ladder-dot{background:var(--green);box-shadow:0 0 10px var(--green)}
.ladder-row.current{color:var(--green)}
.ladder-xp{margin-left:auto;font-family:var(--mono);font-size:10px;color:var(--muted)}

/* leaderboard */
.lb-row{display:flex;align-items:center;gap:14px;padding:12px 16px;border-bottom:1px solid var(--line);font-size:13px}
.lb-row:last-child{border-bottom:none}
.lb-row.me{background:rgba(110,242,164,.055)}
.lb-pos{width:26px;font-family:var(--mono);font-size:11px;color:var(--muted);text-align:right}
.lb-pos.top{color:var(--amber);font-weight:700}
.lb-avatar{width:30px;height:30px;border-radius:8px;background:#121d22;border:1px solid var(--line);display:grid;place-items:center;
  font-family:var(--mono);font-size:10px;color:var(--text-2)}
.lb-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lb-name .you{font-family:var(--mono);font-size:9px;color:var(--green);border:1px solid rgba(110,242,164,.3);border-radius:4px;padding:1px 4px;margin-left:6px}
.lb-rank{font-size:11px;color:var(--muted);width:130px;text-align:right}
.lb-xp{font-family:var(--mono);font-size:11.5px;color:var(--green);width:70px;text-align:right}

/* modal */
.modal-back{position:fixed;inset:0;z-index:1000;background:rgba(2,5,6,.72);backdrop-filter:blur(6px);
  display:flex;align-items:flex-start;justify-content:center;padding:9vh 18px 18px;animation:fade .18s}
@keyframes fade{from{opacity:0}}
.modal{width:100%;max-width:560px;border-radius:16px;border:1px solid var(--line-2);background:var(--panel);
  box-shadow:0 30px 80px -20px #000;overflow:hidden;animation:rise .22s cubic-bezier(.2,.8,.2,1)}
.modal.wide{max-width:680px}
@keyframes rise{from{transform:translateY(10px) scale(.99);opacity:0}}
.modal-head{padding:16px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}
.modal-head h3{font-size:14px}
.modal-body{padding:18px}
.modal-foot{padding:14px 18px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:8px}
.opt-input{width:100%;padding:11px 13px;border-radius:9px;border:1px solid var(--line-2);background:#070c0f;
  color:var(--text);font-family:var(--font);font-size:14px;outline:none}
.opt-input:focus{border-color:rgba(110,242,164,.5)}
.opt-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.opt{padding:12px 10px;border-radius:9px;border:1px solid var(--line);background:rgba(255,255,255,.025);cursor:pointer;
  text-align:left;transition:.15s;font-size:12px}
.opt:hover{border-color:var(--line-2)}
.opt.sel{border-color:var(--green);background:var(--green-soft)}
.opt b{display:block;font-size:12px;margin-bottom:2px}
.opt span{font-size:10.5px;color:var(--muted)}
.eth-list{display:flex;flex-direction:column;gap:8px;margin:12px 0}
.eth-item{display:flex;gap:9px;font-size:12px;color:var(--text-2);align-items:flex-start;cursor:pointer}
.eth-item input{margin-top:3px;accent-color:var(--green)}
.progress-dots{display:flex;gap:5px;margin-top:14px}
.pd{height:4px;flex:1;border-radius:3px;background:#1a262d}
.pd.on{background:var(--green)}

/* search */
.search-input{width:100%;padding:14px 16px;border:none;border-bottom:1px solid var(--line);background:transparent;
  color:var(--text);font-size:15px;outline:none;font-family:var(--font)}
.search-results{max-height:380px;overflow-y:auto;padding:6px}
.search-item{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:8px;cursor:pointer;font-size:13px}
.search-item:hover,.search-item.sel{background:rgba(110,242,164,.07)}
.search-item .si-title{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.search-item .si-path{font-size:10.5px;color:var(--muted);font-family:var(--mono)}
.search-empty{padding:30px;text-align:center;color:var(--muted);font-size:12.5px}
.kbd-hint{font-family:var(--mono);font-size:9.5px;color:#576b74;padding:8px 14px;border-top:1px solid var(--line);display:flex;gap:14px}

/* toast */
.toasts{position:fixed;right:18px;bottom:18px;z-index:2000;display:flex;flex-direction:column;gap:8px;pointer-events:none}
.toast{display:flex;align-items:center;gap:10px;padding:11px 15px;border-radius:10px;border:1px solid rgba(110,242,164,.3);
  background:rgba(10,20,15,.96);box-shadow:0 16px 40px -12px #000;font-size:12.5px;animation:slidein .25s;max-width:340px}
.toast svg{width:15px;height:15px;color:var(--green);flex:0 0 auto}
@keyframes slidein{from{transform:translateX(20px);opacity:0}}
.toast.out{animation:slideout .25s forwards}
@keyframes slideout{to{transform:translateX(20px);opacity:0}}

/* confetti */
.confetti-layer{position:fixed;inset:0;pointer-events:none;z-index:3000;overflow:hidden}
.confetti{position:absolute;width:7px;height:11px;opacity:.9;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(105vh) rotate(720deg);opacity:0}}

/* footer */
.footer{padding:26px 30px 34px;border-top:1px solid var(--line);margin-top:30px;color:#586b74;font-size:11px;
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-family:var(--mono)}
.footer a:hover{color:var(--green)}

/* certificate print */
.cert-sheet{background:#f5f1e6;color:#141a16;padding:46px;border-radius:6px;font-family:var(--font);position:relative;overflow:hidden}
.cert-sheet::before{content:"";position:absolute;inset:14px;border:1px solid rgba(20,26,22,.2);pointer-events:none}
.cert-sheet h1{font-size:30px;letter-spacing:.04em}
.cert-sheet .cname{font-size:26px;margin:22px 0 6px;border-bottom:1px solid rgba(0,0,0,.3);display:inline-block;padding-bottom:4px}
.cert-sheet .cmeta{font-family:var(--mono);font-size:11px;color:#3d4a41;margin-top:26px;line-height:1.9}

/* toolkit */
.tools-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.tool-card{padding:20px}
.tool-card h3{font-size:15px;display:flex;align-items:center;gap:8px}
.tool-card h3 svg{width:16px;height:16px;color:var(--green)}
.tool-desc{font-size:12px;color:var(--muted);line-height:1.6;margin-top:6px}
.tool-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-top:14px}
.tool-field{display:flex;flex-direction:column;gap:4px;font-family:var(--mono);font-size:8.5px;letter-spacing:.13em;color:var(--muted);text-transform:uppercase}
.tool-field.wide{grid-column:1 / -1}
.tool-input{padding:8px 9px;border-radius:7px;border:1px solid var(--line-2);background:#070c0f;color:var(--text);
  font-family:var(--mono);font-size:11.5px;outline:none;width:100%;transition:.15s}
.tool-input:focus{border-color:rgba(110,242,164,.5);box-shadow:0 0 0 3px rgba(110,242,164,.08)}
select.tool-input{appearance:none;cursor:pointer}
.tool-out{margin-top:14px;padding:12px 13px;border-radius:8px;background:#070d10;border:1px solid var(--line);
  font-family:var(--mono);font-size:11.5px;line-height:1.85;color:var(--text-2)}
.tool-out b{color:var(--green);font-weight:600}
.tool-out .warn{color:var(--amber)}
.tool-note{font-size:11px;color:var(--muted);margin-top:9px;line-height:1.6}
.quick-quiz{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.quiz-choice{display:block;width:100%;text-align:left;padding:10px 12px;margin-top:8px;border-radius:8px;
  border:1px solid var(--line);background:rgba(255,255,255,.02);color:var(--text-2);font:inherit;font-size:12.5px;
  cursor:pointer;transition:.15s}
.quiz-choice:hover{border-color:var(--line-2);background:rgba(255,255,255,.04);color:var(--text)}
.quiz-choice.correct{border-color:rgba(110,242,164,.55);background:rgba(110,242,164,.08);color:var(--text)}
.quiz-choice.bad{border-color:rgba(255,107,122,.55);background:rgba(255,107,122,.07);color:#ffc9ce}
.quiz-choice:disabled{cursor:default}
.quiz-feedback{margin-top:12px;font-size:12px;color:var(--text-2);line-height:1.65;display:none}
.quiz-feedback.show{display:block}
.quiz-score{font-family:var(--mono);font-size:10px;letter-spacing:.1em;color:var(--muted)}

/* responsive */
@media (max-width:1080px){
  .hero{grid-template-columns:1fr}
  .hero-side{flex-direction:row;justify-content:flex-start;gap:18px;flex-wrap:wrap}
  .ring-wrap{width:104px;height:104px;margin:0}
  .ring-xp{font-size:17px}
  .room-layout{grid-template-columns:1fr}
  .tasks{position:static;max-height:none}
  .g4{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:860px){
  .shell{grid-template-columns:1fr}
  .sidebar{display:none}
  .main{padding-bottom:66px}
  .topbar{padding:12px 16px}
  .content{padding:18px 16px}
  .search-btn{min-width:0}
  .search-btn .grow,.search-btn kbd{display:none}
  .search-btn{padding:8px;width:34px;justify-content:center}
  .nav{display:none}
  .page-title{font-size:24px}
  .hero-title{font-size:25px}
  .stat-row,.profile-stats,.g3,.g2{grid-template-columns:repeat(2,1fr)}
  .mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:50;background:rgba(8,13,16,.96);
    backdrop-filter:blur(14px);border-top:1px solid var(--line);padding:7px 8px;justify-content:space-around}
  .mnav{display:flex;flex-direction:column;align-items:center;gap:3px;padding:5px 10px;border-radius:8px;
    color:var(--muted);font-size:9px;font-family:var(--mono);letter-spacing:.04em}
  .mnav svg{width:18px;height:18px}
  .mnav.active{color:var(--green);background:rgba(110,242,164,.07)}
  .topbar-title{display:none}
  .tools-grid{grid-template-columns:1fr}
  .room-head{padding:18px}
  .lesson{padding:18px}
  .opt-grid{grid-template-columns:1fr}
  .lb-rank{display:none}
}
@media (max-width:520px){
  .stat-row,.profile-stats,.g3,.g2,.g4{grid-template-columns:1fr}
  .hero-side{justify-content:center}
  .page-title{font-size:22px}
  .topbar .chip.streak{display:none}
  .room-row{gap:10px;padding:11px}
  .room-right .room-xp{display:none}
  .profile-head{gap:14px;padding:18px}
  .profile-avatar{width:58px;height:58px;font-size:22px}
  .term-body{height:320px;font-size:11px}
}

@media print{
  .sidebar,.topbar,.mobile-nav,.footer,.noise,.tasks,.room-tabs,.crumbs,.hero,.toasts,.lab-wrap{display:none!important}
  body{background:#fff}
  .shell{display:block}
  .content{padding:0;max-width:none}
  .cert-sheet{box-shadow:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}

/* ---------- leaderboard podium ---------- */
.podium{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;align-items:stretch}
.podium-card{border:1px solid var(--line);border-radius:14px;padding:20px 14px;text-align:center;
  background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.012))}
.podium-card.me{background:linear-gradient(180deg,rgba(110,242,164,.1),rgba(110,242,164,.02))}
.podium-pos{font-family:var(--mono);font-size:11px;letter-spacing:.18em;margin-bottom:10px}
.podium-name{font-size:13.5px;font-weight:600;margin-top:9px;display:flex;align-items:center;justify-content:center;gap:6px}
.podium-xp{font-family:var(--mono);font-size:15px;color:var(--green);margin-top:2px}
.room-layout > *{min-width:0}
.lib-item{min-width:0}

/* ---------- certificate print ---------- */
@media print{
  body.printing-cert #app,body.printing-cert .noise,body.printing-cert #toasts{display:none!important}
  body.printing-cert #modal-root .modal-back{position:static;inset:auto;background:#fff;backdrop-filter:none;padding:0;display:block}
  body.printing-cert #modal-root .modal{max-width:none;border:none;box-shadow:none;border-radius:0}
  body.printing-cert #modal-root .modal-head,body.printing-cert #modal-root .modal-foot{display:none!important}
  body.printing-cert #modal-root .modal-body{padding:0}
  body.printing-cert .cert-sheet{width:100%;min-height:100vh;box-shadow:none}
  @page{margin:10mm}
}
@media (max-width:520px){
  .podium{grid-template-columns:1fr}
}
.search-btn svg{width:15px;height:15px;flex:0 0 auto}
.brand-mark svg{width:19px;height:19px}