body{background:#0a0b10;color:#e8eaf2;min-height:100vh;overflow-x:hidden}


.hero{padding:44px 24px 36px;border-bottom:1px solid var(--border);position:relative;overflow:hidden}.hero-dots{position:absolute;inset:0;background-image:radial-gradient(rgba(100,154,210,.07) 1px,transparent 1px);background-size:28px 28px;mask-image:radial-gradient(ellipse 80% 100% at 50% 0%,black,transparent)}.hero-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center;position:relative;z-index:1}@media(max-width:680px){.hero-inner{grid-template-columns:1fr}}.hero-tag{font-family:'JetBrains Mono',monospace;font-size:.63rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--cpp-lt);margin-bottom:10px}.hero-title{font-family:'Bebas Neue',cursive;font-size:clamp(2.2rem,6vw,3.8rem);line-height:.95;letter-spacing:.03em;color:white;margin-bottom:12px}.hero-title .cpp{color:var(--cpp)}.hero-sub{font-size:.92rem;color:var(--muted);line-height:1.7;max-width:480px}.hero-pills{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.pill{font-family:'JetBrains Mono',monospace;font-size:.6rem;padding:4px 10px;border-radius:5px;background:rgba(255,255,255,.05);border:1px solid var(--border);letter-spacing:.05em;text-transform:uppercase}.pill.c{border-color:rgba(100,154,210,.3);color:var(--cpp-lt);background:rgba(100,154,210,.07)}.hero-cta{background:var(--cpp);color:#fff;font-family:'Bebas Neue',cursive;font-size:1.05rem;letter-spacing:.1em;padding:11px 26px;border-radius:10px;box-shadow:0 4px 0 var(--cpp-dk);transition:transform .12s,filter .15s;display:inline-block;margin-top:16px}.hero-cta:hover{filter:brightness(1.15);transform:translateY(-2px)}.hero-preview{background:var(--bg3);border:1px solid var(--border);border-radius:14px;padding:16px 18px;min-width:190px}.hero-preview-title{font-family:'JetBrains Mono',monospace;font-size:.58rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--cpp-lt);margin-bottom:10px}.hero-stat{display:flex;justify-content:space-between;align-items:center;padding:6px 0;border-bottom:1px solid var(--border);font-size:.8rem}.hero-stat:last-child{border-bottom:none}.hero-stat-label{color:var(--muted);font-size:.72rem}.hero-stat-val{font-family:'Bebas Neue',cursive;font-size:.95rem;letter-spacing:.05em;color:var(--cpp-lt)}
.main-layout{display:grid;grid-template-columns:1fr 400px;max-width:1400px;margin:0 auto;min-height:calc(100vh - 60px)}@media(max-width:960px){.main-layout{grid-template-columns:1fr}.game-panel{position:relative;min-height:460px}}
.steps-panel{border-right:1px solid var(--border)}.steps-tabs{display:flex;overflow-x:auto;scrollbar-width:none;border-bottom:1px solid var(--border);background:var(--bg2)}.steps-tabs::-webkit-scrollbar{display:none}.tab-btn{flex-shrink:0;padding:12px 10px;font-family:'JetBrains Mono',monospace;font-size:.5rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;color:var(--muted);background:none;border:none;cursor:pointer;border-bottom:2px solid transparent;transition:color .15s,border-color .15s;white-space:nowrap}.tab-btn:hover{color:var(--text)}.tab-btn.active{color:var(--cpp-lt);border-bottom-color:var(--cpp)}.tab-btn.done::before{content:"? ";color:var(--green-lt)}
.code-area{margin:14px 0}.code-area-label{display:flex;align-items:center;gap:8px;font-family:'JetBrains Mono',monospace;font-size:.6rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--cpp-lt);margin-bottom:6px}.live-badge{background:rgba(61,220,132,.12);border:1px solid rgba(61,220,132,.25);color:var(--green-lt);font-size:.52rem;padding:2px 7px;border-radius:4px;letter-spacing:.06em}.code-block{background:#020617;border-radius:12px;border:1px solid var(--border);overflow:hidden}.code-block-header{display:flex;gap:6px;align-items:center;padding:9px 13px;border-bottom:1px solid var(--border);background:rgba(255,255,255,.015)}.dot{width:10px;height:10px;border-radius:50%}.code-fname{font-family:'JetBrains Mono',monospace;font-size:.6rem;color:var(--muted);margin-left:6px}.code-pre{padding:16px 18px;font-family:'JetBrains Mono',monospace;font-size:.78rem;line-height:1.85;white-space:pre-wrap;word-break:break-word}.cc{color:rgba(120,140,170,.55);font-style:italic}.ck{color:#c792ea}.cp{color:var(--cpp-lt)}.cf{color:#82aaff}.cs{color:#c3e88d}.cn{color:#f78c6c}.ct{color:#ffcb6b}
.blank{font-family:'JetBrains Mono',monospace;font-size:.82rem;font-weight:700;background:rgba(100,154,210,.1);border:1.5px solid rgba(100,154,210,.35);color:var(--cpp-lt);border-radius:5px;padding:3px 7px;width:var(--w,56px);text-align:center;outline:none;transition:border-color .2s,box-shadow .2s}.blank:focus{border-color:var(--cpp);box-shadow:0 0 0 3px rgba(100,154,210,.18)}
.box{border-radius:10px;padding:12px 15px;margin:12px 0;font-size:.82rem;line-height:1.7}.box strong{font-weight:800}.box-concept{background:rgba(100,154,210,.06);border:1px solid rgba(100,154,210,.15);color:var(--cpp-lt)}.box-tip{background:rgba(247,195,22,.06);border:1px solid rgba(247,195,22,.15);color:#fada7a}.box-do{background:rgba(61,220,132,.06);border:1px solid rgba(61,220,132,.15);color:var(--green-lt)}.box-cpp{background:rgba(155,107,255,.06);border:1px solid rgba(155,107,255,.15);color:#c9b3ff}.box-advanced{background:rgba(249,115,22,.06);border:1px solid rgba(249,115,22,.15);color:#fdba74}
.run-btn{width:100%;padding:14px;font-family:'Bebas Neue',cursive;font-size:1.2rem;letter-spacing:.12em;color:white;background:linear-gradient(135deg,var(--cpp),var(--cpp-dk));border:none;border-radius:10px;cursor:pointer;margin:14px 0 0;box-shadow:0 4px 0 rgba(58,111,160,.5);transition:transform .1s,filter .15s}.run-btn:hover{filter:brightness(1.1);transform:translateY(-2px)}.run-btn:active{transform:translateY(1px);box-shadow:0 1px 0 rgba(58,111,160,.5)}.step-nav{display:flex;gap:10px;margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}.btn-prev,.btn-next{flex:1;padding:10px;border:1px solid var(--border);background:var(--bg2);color:var(--text);font-family:'Nunito',sans-serif;font-size:.8rem;font-weight:700;border-radius:8px;cursor:pointer;transition:background .15s,border-color .15s}.btn-prev:hover,.btn-next:hover{background:var(--bg3);border-color:rgba(255,255,255,.15)}.btn-prev:disabled,.btn-next:disabled{opacity:.25;cursor:default}.btn-next{background:rgba(100,154,210,.12);border-color:rgba(100,154,210,.25);color:var(--cpp-lt)}.btn-next:hover{background:rgba(100,154,210,.2)}
.game-panel{position:sticky;top:60px;height:calc(100vh - 60px);display:flex;flex-direction:column;background:var(--bg2)}.game-top{padding:12px 16px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px}.game-top-title{font-family:'Bebas Neue',cursive;font-size:1rem;letter-spacing:.08em;color:white}.game-live{display:flex;align-items:center;gap:6px;font-family:'JetBrains Mono',monospace;font-size:.58rem;color:var(--green-lt);letter-spacing:.04em}.live-dot{width:6px;height:6px;border-radius:50%;background:var(--green);animation:pulse 2s infinite}@keyframes pulse{0%,100%{opacity:.5}50%{opacity:1}}.canvas-wrap{flex:1;display:flex;align-items:center;justify-content:center;padding:12px;overflow:hidden}canvas{border-radius:10px;border:1px solid var(--border);display:block;max-width:100%;max-height:100%}.game-hint{padding:8px 16px;border-top:1px solid var(--border);font-family:'JetBrains Mono',monospace;font-size:.55rem;color:var(--muted);text-align:center;letter-spacing:.02em}.tower-bar{display:flex;gap:4px;padding:6px 12px;border-top:1px solid var(--border);background:rgba(0,0,0,.2);justify-content:center;flex-wrap:wrap}.tb{padding:4px 8px;font-family:'JetBrains Mono',monospace;font-size:.55rem;font-weight:700;border-radius:5px;cursor:pointer;border:1.5px solid var(--border);background:var(--bg3);color:var(--muted);transition:all .15s;white-space:nowrap}.tb:hover{border-color:rgba(255,255,255,.2);color:var(--text)}.tb.active{border-color:var(--cpp);color:var(--cpp-lt);background:rgba(100,154,210,.1)}.tb .tb-cost{color:var(--muted);font-size:.48rem}
.progress-strip{max-width:1400px;margin:0 auto;padding:16px 24px;display:flex;align-items:center;gap:14px;border-top:1px solid var(--border)}.prog-label{font-family:'JetBrains Mono',monospace;font-size:.6rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);white-space:nowrap}.prog-track{flex:1;height:5px;background:var(--bg3);border-radius:4px;overflow:hidden}.prog-fill{height:100%;background:linear-gradient(90deg,var(--cpp),var(--cpp-lt));border-radius:4px;transition:width .4s ease}.prog-dots{display:flex;gap:3px}.prog-dot{width:6px;height:6px;border-radius:50%;background:var(--bg3);border:1px solid var(--border);transition:background .3s}.prog-dot.active{background:var(--cpp);border-color:var(--cpp)}.prog-dot.done{background:var(--green);border-color:var(--green)}
.more-section{max-width:1400px;margin:0 auto;padding:30px 24px}.more-title{font-family:'Bebas Neue',cursive;font-size:1.9rem;letter-spacing:.04em;color:white;margin-bottom:20px}.more-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px}.more-card{background:var(--bg2);border:1px solid var(--border);border-radius:12px;padding:17px 19px;display:flex;flex-direction:column;gap:7px;transition:border-color .2s,transform .2s}.more-card:hover{border-color:rgba(255,255,255,.15);transform:translateY(-3px)}.more-icon{font-size:1.5rem}.more-tag{font-family:'JetBrains Mono',monospace;font-size:.58rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.more-name{font-family:'Bebas Neue',cursive;font-size:1rem;letter-spacing:.04em;color:white}.more-cta{font-size:.76rem;font-weight:700;margin-top:auto}footer{background:var(--bg2);border-top:1px solid var(--border);padding:22px;text-align:center;color:var(--muted);font-size:.76rem}footer a{color:var(--muted)}footer a:hover{color:var(--text)}

/* -- MOBILE RESPONSIVE PATCH ---------------------------- */
@media(max-width:600px){
  /* Inputs: bigger touch targets */
  .blank{min-width:52px;padding:5px 8px;font-size:.8rem;}
  /* Code blocks: wrap long lines */
  .code-pre{font-size:.68rem;white-space:pre-wrap;word-break:break-word;padding:10px 12px;}
  /* Run button: full-width, larger */
  .run-btn{padding:15px;font-size:1.1rem;}
  /* Step nav buttons */
  .btn-prev,.btn-next{padding:12px 8px;font-size:.8rem;}
  /* Step body padding */
  /* Tab buttons: scrollable row stays usable */
  .tab-btn{padding:10px 10px;font-size:.58rem;}
  /* Hero: hide stat panel that overflows */
  .hero-preview{display:none;}
  /* Canvas: scale to viewport */
  canvas{max-width:100%;height:auto;}
  .canvas-wrap{padding:8px;}
  /* Hint text */
  .game-hint{font-size:.5rem;padding:6px 12px;}
  /* Section padding */
  .hero{padding:28px 16px 22px;}
  /* Boxes */
  .box{font-size:.78rem;padding:9px 11px;}
  /* Step title */
}
@media(max-width:400px){
  .blank{min-width:42px;font-size:.75rem;}
  .code-pre{font-size:.62rem;}
  .tab-btn{padding:8px 7px;font-size:.52rem;}
}
/* ------------------------------------------------------- */



/* -- CODE CHALLENGE -- */



/* -- PREDICT -- */
.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}.skip-link:focus{left:50%;transform:translateX(-50%);top:8px;width:auto;height:auto;padding:10px 20px;background:#BC4749;color:white;font-weight:700;font-size:.9rem;border-radius:8px;z-index:9999;text-decoration:none;white-space:nowrap}
.reveal{opacity:1!important;transform:none!important}