:root{
  --bg:#08111f;--panel:#101b2d;--panel2:#15233a;--text:#edf4ff;--muted:#9db0c9;--line:#233754;
  --accent:#7c5cff;--accent2:#2dd4bf;--gold:#fbbf24;--danger:#fb7185;--ok:#34d399;--shadow:0 18px 50px rgba(0,0,0,.25);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:radial-gradient(circle at top right,#172554 0,#08111f 35%,#050a12 100%);color:var(--text);min-height:100vh}
a{color:inherit;text-decoration:none}
button,input,textarea{font:inherit}
button{cursor:pointer}
.container{width:min(1180px,calc(100% - 32px));margin:auto}
.nav{position:sticky;top:0;z-index:30;background:rgba(8,17,31,.82);backdrop-filter:blur(18px);border-bottom:1px solid rgba(255,255,255,.06)}
.nav-inner{height:72px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800}.brand-logo{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),#a78bfa);box-shadow:0 10px 25px rgba(124,92,255,.35);font-size:22px}.brand small{display:block;color:var(--muted);font-weight:600;font-size:11px;letter-spacing:.08em;text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.nav-links a,.ghost-btn{padding:10px 13px;border-radius:11px;color:var(--muted);border:1px solid transparent;background:transparent}.nav-links a:hover,.ghost-btn:hover{color:var(--text);background:rgba(255,255,255,.06)}
.pill{padding:7px 11px;border-radius:999px;background:rgba(45,212,191,.12);color:#99f6e4;border:1px solid rgba(45,212,191,.2);font-size:12px;font-weight:800}
.hero{padding:82px 0 52px;display:grid;grid-template-columns:1.2fr .8fr;gap:36px;align-items:center}.kicker{color:#c4b5fd;font-weight:800;text-transform:uppercase;letter-spacing:.12em;font-size:12px}.hero h1{font-size:clamp(44px,7vw,86px);line-height:.96;margin:14px 0 22px;letter-spacing:-.055em}.gradient-text{background:linear-gradient(90deg,#fff,#c4b5fd 45%,#5eead4);-webkit-background-clip:text;background-clip:text;color:transparent}.hero p{font-size:19px;line-height:1.7;color:#b7c6da;max-width:760px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.btn{border:0;border-radius:14px;padding:14px 18px;font-weight:800;display:inline-flex;align-items:center;justify-content:center;gap:9px}.btn-primary{background:linear-gradient(135deg,var(--accent),#8b5cf6);color:white;box-shadow:0 14px 30px rgba(124,92,255,.3)}.btn-secondary{background:#111d31;color:#dce8f7;border:1px solid var(--line)}.btn-success{background:#0f766e;color:#ecfeff}.btn-danger{background:#881337;color:#fff1f2}.btn:disabled{opacity:.45;cursor:not-allowed}
.hero-card,.card{background:linear-gradient(180deg,rgba(21,35,58,.92),rgba(11,21,37,.92));border:1px solid rgba(255,255,255,.08);border-radius:24px;box-shadow:var(--shadow)}.hero-card{padding:24px}.avatar{width:78px;height:78px;border-radius:24px;background:linear-gradient(135deg,#f0abfc,#818cf8);display:grid;place-items:center;font-size:36px;margin-bottom:18px}.hero-card h3{font-size:24px;margin:0 0 8px}.hero-card p{font-size:14px;margin:0 0 18px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.stat{padding:14px;border-radius:16px;background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.05)}.stat b{display:block;font-size:21px}.stat span{color:var(--muted);font-size:11px}
.section{padding:34px 0 72px}.section-title{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:22px}.section-title h2{font-size:34px;margin:0}.section-title p{color:var(--muted);margin:7px 0 0}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.feature{padding:22px}.feature .icon{font-size:28px}.feature h3{margin:13px 0 8px}.feature p{color:var(--muted);line-height:1.6;margin:0}.footer{border-top:1px solid rgba(255,255,255,.07);padding:28px 0 44px;color:var(--muted);font-size:13px}
.dashboard{padding:34px 0 80px}.welcome{display:grid;grid-template-columns:1.3fr .7fr;gap:18px;margin-bottom:18px}.welcome-main{padding:26px}.welcome h1{margin:0 0 8px;font-size:38px}.muted{color:var(--muted)}.progress-wrap{margin:18px 0 8px}.progress{height:12px;background:#091220;border:1px solid #20324e;border-radius:999px;overflow:hidden}.progress>div{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:inherit}.progress-label{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;margin-top:8px}.xp-card{padding:24px;display:flex;flex-direction:column;justify-content:space-between}.level-badge{font-size:12px;color:#ddd6fe;font-weight:800}.xp-number{font-size:44px;font-weight:900;letter-spacing:-.05em}.xp-number small{font-size:14px;color:var(--muted);letter-spacing:0}.module-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.module-card{padding:18px;display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center}.module-number{width:48px;height:48px;border-radius:16px;background:#111f35;display:grid;place-items:center;font-weight:900;color:#c4b5fd}.module-card h3{margin:0 0 4px;font-size:17px}.module-card p{margin:0;color:var(--muted);font-size:13px}.module-card .meta{font-size:11px;color:#91a6c0;margin-top:7px}.module-card.done .module-number{background:rgba(52,211,153,.12);color:#6ee7b7}.lock{opacity:.5}
.layout{display:grid;grid-template-columns:280px 1fr;min-height:calc(100vh - 72px)}.sidebar{border-right:1px solid rgba(255,255,255,.06);background:rgba(7,14,26,.58);padding:20px 14px;position:sticky;top:72px;height:calc(100vh - 72px);overflow:auto}.side-title{padding:8px 10px 14px;font-weight:900}.side-module{margin-bottom:6px}.side-module button{width:100%;text-align:left;border:0;background:transparent;color:#aebed2;padding:10px;border-radius:10px}.side-module button:hover,.side-module button.active{background:#142139;color:#fff}.side-module button span{display:block;font-size:11px;color:#6f86a4;margin-top:3px}.content{padding:30px 32px 80px;max-width:980px;width:100%}.breadcrumbs{font-size:12px;color:#8399b5;margin-bottom:15px}.lesson h1{font-size:42px;margin:0 0 8px;letter-spacing:-.035em}.lesson h2{font-size:27px;margin:34px 0 12px}.lesson h3{font-size:20px;margin-top:24px}.lesson p,.lesson li{line-height:1.75;color:#c3d1e3}.lesson ul{padding-left:24px}.callout{padding:16px 18px;border-radius:16px;background:rgba(124,92,255,.08);border:1px solid rgba(124,92,255,.22);margin:18px 0}.callout.tip{background:rgba(45,212,191,.07);border-color:rgba(45,212,191,.2)}.callout.warning{background:rgba(251,191,36,.07);border-color:rgba(251,191,36,.2)}
.codebox{margin:16px 0;border-radius:18px;overflow:hidden;border:1px solid #243754;background:#08101d}.codebar{height:44px;background:#101a2a;display:flex;align-items:center;justify-content:space-between;padding:0 12px;color:#90a6c2;font-size:12px}.dots{display:flex;gap:6px}.dot{width:9px;height:9px;border-radius:50%;background:#475569}.codebox pre{margin:0;padding:18px;overflow:auto;color:#d9e7f8;line-height:1.65;font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;font-size:14px;white-space:pre-wrap}.codebox textarea{width:100%;min-height:210px;resize:vertical;border:0;border-top:1px solid #223550;background:#070e19;color:#e2edf9;padding:18px;font-family:"SFMono-Regular",Consolas,monospace;font-size:14px;line-height:1.6;outline:none}.console{background:#030712;color:#a7f3d0;min-height:70px;padding:14px 16px;font-family:monospace;white-space:pre-wrap;border-top:1px solid #17233a}.code-actions{display:flex;gap:8px;padding:10px;background:#0d1727;flex-wrap:wrap}.tiny-btn{border:1px solid #273b5b;background:#132039;color:#dce8f7;border-radius:10px;padding:8px 10px;font-size:12px;font-weight:800}.tiny-btn.run{background:#0f766e;border-color:#0f766e}.tiny-btn.check{background:#5b21b6;border-color:#6d28d9}.tiny-btn.hint{background:#78350f;border-color:#92400e}.feedback{margin-top:12px;padding:12px 14px;border-radius:12px;font-size:13px}.feedback.ok{background:rgba(52,211,153,.1);border:1px solid rgba(52,211,153,.25);color:#a7f3d0}.feedback.bad{background:rgba(251,113,133,.1);border:1px solid rgba(251,113,133,.25);color:#fecdd3}
.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:44px;padding-top:20px;border-top:1px solid var(--line)}.quiz{padding:20px;margin:20px 0}.question{margin:18px 0 24px}.question strong{display:block;margin-bottom:10px}.option{display:flex;align-items:flex-start;gap:10px;padding:11px 12px;margin:7px 0;background:#0f1a2c;border:1px solid #223654;border-radius:12px}.option input{margin-top:3px}
.badge-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.badge-card{padding:18px;text-align:center}.badge-icon{font-size:42px;filter:grayscale(1);opacity:.35}.badge-card.unlocked .badge-icon{filter:none;opacity:1}.badge-card h3{font-size:14px;margin:10px 0 4px}.badge-card p{font-size:11px;color:var(--muted);margin:0}.badge-card.unlocked{outline:1px solid rgba(251,191,36,.28);box-shadow:0 0 28px rgba(251,191,36,.08)}
.playground{padding:34px 0 70px}.playgrid{display:grid;grid-template-columns:1fr .7fr;gap:18px}.panel{padding:18px}.panel h2,.panel h3{margin-top:0}.challenge-list{display:grid;gap:10px}.challenge{padding:13px;border:1px solid #223654;background:#0d1828;border-radius:12px}.challenge b{display:block;margin-bottom:4px}.challenge span{font-size:12px;color:var(--muted)}
.certificate{max-width:900px;margin:40px auto;padding:60px;border:12px double #ad8b3a;background:#fff;color:#18212f;text-align:center;box-shadow:var(--shadow)}.certificate .seal{font-size:58px}.certificate h1{font-family:Georgia,serif;font-size:50px;margin:10px 0}.certificate h2{font-size:30px}.certificate p{color:#4b5563}.certificate .name{font-family:Georgia,serif;font-size:42px;border-bottom:1px solid #888;display:inline-block;padding:0 35px 8px;margin:24px}.print-only{display:none}
.search{width:100%;padding:11px 12px;border-radius:11px;border:1px solid #263a59;background:#0b1525;color:white;margin:8px 0 14px}.mobile-menu{display:none}
@media(max-width:900px){.hero,.welcome,.playgrid{grid-template-columns:1fr}.grid{grid-template-columns:1fr 1fr}.module-grid{grid-template-columns:1fr}.layout{grid-template-columns:1fr}.sidebar{position:relative;top:0;height:auto;border-right:0;border-bottom:1px solid rgba(255,255,255,.07);max-height:280px}.content{padding:24px 18px 70px}.badge-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.nav-inner{height:auto;padding:12px 0;align-items:flex-start}.nav-links{justify-content:flex-end}.nav-links a{font-size:12px;padding:8px}.hero{padding-top:52px}.hero h1{font-size:48px}.grid{grid-template-columns:1fr}.stats{grid-template-columns:1fr 1fr}.lesson h1{font-size:34px}.certificate{padding:24px;margin:12px;border-width:6px}.certificate h1{font-size:32px}.certificate .name{font-size:30px;padding:0 10px}.brand small{display:none}}
@media print{body{background:white}.nav,.footer,.lesson-nav,.no-print{display:none!important}.certificate{box-shadow:none;margin:0;max-width:none;height:100vh;display:flex;flex-direction:column;justify-content:center}.print-only{display:block}}