:root{--bg:#0a0a12;--panel:#14141f;--txt:#f5f5fa;--mut:#9aa0b5;
--red:#ff2a4d;--cyan:#22d3ee;--yellow:#fde047;--pink:#ff4fa3;--blue:#4f7bff;--green:#3ad17a;}
*{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Trebuchet MS',Segoe UI,sans-serif;background:
  radial-gradient(circle at 12% 18%, rgba(255,42,77,.10) 0 22%, transparent 23%),
  radial-gradient(circle at 60% 40%, rgba(34,211,238,.08) 0 22%, transparent 23%),
  radial-gradient(circle at 85% 75%, rgba(253,224,71,.07) 0 22%, transparent 23%),
  var(--bg); background-size:34px 34px,34px 34px,34px 34px,auto;
  color:var(--txt);line-height:1.6;padding-bottom:80px;}
header{background:linear-gradient(100deg,#1a0008,#0a0a12 60%);border-bottom:4px solid var(--red);
  padding:20px 24px;display:flex;align-items:center;gap:16px;flex-wrap:wrap;position:sticky;top:0;z-index:30;
  box-shadow:0 6px 0 rgba(34,211,238,.18);}
header h1{font-family:Impact,'Arial Black',sans-serif;font-size:34px;letter-spacing:2px;color:var(--red);
  text-shadow:3px 3px 0 var(--cyan),6px 6px 0 #000;transform:rotate(-2deg);}
header .tag{color:var(--mut);font-size:12px;font-weight:bold;letter-spacing:1px;}
nav{display:flex;gap:8px;margin-left:auto;flex-wrap:wrap;}
nav a{color:var(--txt);text-decoration:none;font-weight:bold;font-size:13px;padding:7px 13px;border:2px solid #2a2a3a;
  border-radius:8px;background:var(--panel);transition:.15s;}
nav a:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px);}
.wrap{max-width:960px;margin:0 auto;padding:0 18px;}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin:20px 0;}
.card{background:var(--panel);border:3px solid #000;border-radius:12px;padding:14px 16px;box-shadow:4px 4px 0 var(--red);}
.card .n{font-family:Impact,sans-serif;font-size:28px;color:var(--cyan);line-height:1;}
.card .l{color:var(--mut);font-size:11px;text-transform:uppercase;letter-spacing:1px;margin-top:4px;}
.bar{height:9px;background:#20202e;border:2px solid #000;border-radius:5px;overflow:hidden;margin-top:8px;}
.bar>i{display:block;height:100%;background:linear-gradient(90deg,var(--yellow),var(--red));width:0;}
.panel{background:var(--panel);border:4px solid #000;border-radius:14px;padding:20px;margin:16px 0;box-shadow:6px 6px 0 var(--cyan);}
.panel.today{border-color:var(--red);box-shadow:6px 6px 0 var(--yellow);}
.panel.recall{border-color:var(--blue);box-shadow:6px 6px 0 var(--pink);}
.panel.flash{border-color:var(--green);box-shadow:6px 6px 0 var(--cyan);}
.panel.chal{border-color:var(--yellow);box-shadow:5px 5px 0 var(--red);}
.burst{display:inline-block;background:var(--yellow);color:#000;font-family:Impact,sans-serif;font-size:18px;
  letter-spacing:1px;padding:4px 14px;border:3px solid #000;transform:rotate(-3deg);
  clip-path:polygon(0 18%,8% 0,100% 0,92% 18%,100% 82%,92% 100%,8% 100%,0 82%);}
h2{font-family:Impact,sans-serif;letter-spacing:1px;font-size:24px;color:var(--txt);margin-bottom:6px;}
.bridge{color:var(--pink);font-style:italic;margin-bottom:12px;}
.concept{margin-bottom:12px;}
pre{background:#05050a;border:3px solid #000;border-radius:10px;padding:14px;overflow:auto;position:relative;font-size:13px;}
pre .copy{position:absolute;top:6px;right:6px;background:var(--red);color:#fff;border:2px solid #000;border-radius:6px;
  padding:2px 9px;cursor:pointer;font-size:11px;font-weight:bold;}
pre .copy:hover{background:var(--cyan);color:#000;}
code{font-family:ui-monospace,Menlo,monospace;color:#7ee7ff;white-space:pre;}
.tip{background:#0e1622;border-left:4px solid var(--cyan);padding:10px 14px;margin-top:12px;color:var(--mut);font-size:13px;}
.exercise{background:#101822;border:2px dashed var(--yellow);border-radius:10px;padding:12px 14px;margin-top:12px;}
.exercise b{color:var(--yellow);}
.btn{display:inline-block;background:var(--red);color:#fff;border:3px solid #000;border-radius:10px;padding:10px 18px;
  font-size:14px;font-weight:bold;cursor:pointer;text-decoration:none;margin-top:10px;box-shadow:3px 3px 0 #000;
  font-family:Impact,sans-serif;letter-spacing:1px;}
.btn:hover{background:var(--cyan);color:#000;transform:translate(1px,1px);box-shadow:2px 2px 0 #000;}
.btn.sec{background:var(--panel);color:var(--txt);border-color:#2a2a3a;box-shadow:3px 3px 0 #2a2a3a;}
.btn.sec:hover{background:#20202e;color:var(--cyan);}
.btn.green{background:var(--green);color:#04130a;}
.btn.green:hover{background:var(--cyan);color:#000;}
.calendar{display:grid;grid-template-columns:repeat(auto-fill,minmax(36px,1fr));gap:7px;}
.day{aspect-ratio:1;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:12px;
  border:2px solid #000;background:var(--panel);color:var(--mut);text-decoration:none;font-weight:bold;}
.day.done{background:var(--red);color:#fff;box-shadow:2px 2px 0 var(--cyan);}
.day.cur{border:3px solid var(--yellow);color:var(--yellow);box-shadow:0 0 0 2px var(--red);}
.section-title{margin:22px 0 6px;color:var(--mut);font-size:12px;text-transform:uppercase;letter-spacing:2px;}
.msg{background:var(--panel);border:2px solid var(--blue);border-radius:10px;padding:12px 14px;margin:12px 0;color:var(--mut);}
a.link{color:var(--cyan);text-decoration:none;} a.link:hover{text-decoration:underline;}
.codespace{margin-top:16px;border:4px solid var(--cyan);border-radius:12px;overflow:hidden;box-shadow:6px 6px 0 var(--red);}
.codespace .bar-top{background:#05050a;border-bottom:2px solid #000;padding:8px 12px;display:flex;gap:8px;align-items:center;flex-wrap:wrap;}
.dot{width:12px;height:12px;border-radius:50%;border:2px solid #000;}
.dot.r{background:var(--red);}.dot.y{background:var(--yellow);}.dot.g{background:#3ad17a;}
.codespace .title{color:var(--mut);font-size:12px;font-weight:bold;}
#code{width:100%;min-height:190px;background:#05050a;color:#7ee7ff;border:none;padding:14px;
  font-family:ui-monospace,Menlo,monospace;font-size:13.5px;resize:vertical;outline:none;}
#out{background:#0a0a12;color:#c8ffd4;border-top:2px solid #000;padding:12px 14px;font-family:ui-monospace,Menlo,monospace;
  font-size:13px;white-space:pre-wrap;min-height:60px;}
#out.error{color:#ff9b9b;}
.vsc{background:#1e1e1e;color:#fff;border:3px solid #000;border-radius:10px;padding:14px;margin-top:14px;font-family:ui-monospace,Menlo,monospace;font-size:12.5px;}
.vsc a{color:var(--cyan);}
.vsc .run{color:var(--green);}
.chal-out{margin-top:8px;font-weight:bold;}
.chal-out.ok{color:var(--green);} .chal-out.no{color:var(--red);}
.rank-hero{text-align:center;border:4px solid var(--yellow);border-radius:16px;padding:24px;margin:16px 0;
  background:radial-gradient(circle at 50% 0,#2a0010,#0a0a12);box-shadow:7px 7px 0 var(--red);}
.rank-hero .lv{font-family:Impact,sans-serif;font-size:64px;color:var(--yellow);text-shadow:4px 4px 0 var(--red);line-height:1;}
.rank-hero .nm{font-family:Impact,sans-serif;font-size:30px;letter-spacing:2px;color:var(--cyan);}
.rank-hero .rk{color:var(--pink);font-weight:bold;}
.rank-hero .pw{color:var(--txt);margin-top:8px;}
.rank-hero .can{color:var(--mut);font-style:italic;margin-top:8px;max-width:520px;margin-left:auto;margin-right:auto;}
.bonus-item{display:block;text-decoration:none;color:var(--txt);background:var(--panel);border:3px solid #000;
  border-radius:10px;padding:12px 14px;margin:9px 0;box-shadow:3px 3px 0 var(--blue);}
.bonus-item:hover{border-color:var(--cyan);}
.bonus-item.read{border-color:var(--red);box-shadow:3px 3px 0 var(--red);opacity:.92;}
.bonus-item .cat{color:var(--mut);font-size:11px;text-transform:uppercase;letter-spacing:1px;}
.bonus-item .xp{float:right;color:var(--yellow);font-weight:bold;}
.bonus-article{white-space:pre-wrap;font-size:14px;line-height:1.75;}
footer{text-align:center;color:var(--mut);font-size:11px;padding:18px;}
.sec-note{color:var(--red);font-size:11px;margin-top:14px;border-top:1px dashed #333;padding-top:8px;}