:root{
  --bg:#f8faff;

  --surface:#ffffff;
  --surface-soft:#f4f6ff;

  --primary:#4f46e5;
  --primary-2:#6366f1;
  --primary-dark:#312e81;

  --text:#1e293b;
  --muted:#64748b;

  --line:#dbe4ff;

  --success:#10b981;
  --danger:#ef4444;

  --shadow:0 20px 45px rgba(79,70,229,.15);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,"Segoe UI",Arial,sans-serif;
  background:
    radial-gradient(circle at top left,rgba(143,75,171,.20),transparent 34rem),
    linear-gradient(135deg,#fff,#f4ecfa 55%,#f9f5fd);
  color:var(--text);
}
.hero{
    position: relative;
    overflow: hidden;

    display: flex;
    justify-content: center;
    align-items: center;

    padding: 80px 20px 120px;

    color: #fff;

    background-image:
        linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px),
        linear-gradient(135deg,#312e81,#6366f1,#8b5cf6);

    background-size:
        40px 40px,
        40px 40px,
        cover;

    text-align: center;
}
.hero::after{
  content:"";
  position:absolute;
  width:320px;height:320px;border-radius:50%;
  right:-90px;bottom:-160px;
  background:rgba(255,255,255,.08);
}
.hero>div,.container{max-width:1120px;margin:auto;position:relative;z-index:1}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  margin:0 0 12px;
  background:rgba(255,255,255,.15);
  border:1px solid rgba(255,255,255,.24);
  padding:8px 14px;border-radius:999px;
  font-weight:700;font-size:14px;
}
.hero h1{margin:8px 0 12px;font-size:clamp(30px,5vw,50px);line-height:1.08;letter-spacing:-.03em}
.hero p{max-width:820px;line-height:1.7;margin:0;color:#f2e8f7}
.container{padding:0 16px 30px;margin-top:-42px}
.card{
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(8px);
  border:1px solid var(--line);
  border-radius:24px;
  padding:24px;
  margin:18px 0;
  box-shadow:var(--shadow);
}
.card h2{color:var(--primary);margin:0 0 16px;font-size:clamp(21px,3vw,28px)}
h3{margin:12px 0;color:var(--primary-dark)}
h4{margin:8px 0 10px;color:var(--muted)}
.form-card form{display:grid;gap:10px}
label{font-weight:800;display:block;margin:4px 0 2px;color:var(--primary-dark)}
input[type=text],input[name=text],input[name=key]{
  width:100%;
  padding:15px 16px;
  border:1.5px solid var(--line);
  border-radius:16px;
  font-size:18px;
  letter-spacing:2px;
  font-family:Consolas,"Courier New",monospace;
  background:var(--surface-soft);
  color:var(--text);
  outline:none;
  transition:.2s ease;
}
input:focus{border-color:var(--primary-2);box-shadow:0 0 0 4px rgba(111,52,138,.12);background:#fff}
.radio-row{display:flex;gap:14px;flex-wrap:wrap}
.radio-row label{
  display:flex;align-items:center;gap:8px;
  margin:0;
  padding:12px 14px;
  border:1px solid var(--line);
  border-radius:16px;
  background:var(--surface-soft);
  cursor:pointer;
}
.actions{display:flex;gap:12px;margin-top:8px;flex-wrap:wrap}
button{
  border:0;border-radius:16px;padding:13px 20px;
  font-weight:900;cursor:pointer;letter-spacing:.02em;
  transition:transform .15s ease,box-shadow .15s ease,background .15s ease;
}
button:hover{transform:translateY(-1px);box-shadow:0 10px 22px rgba(52,18,68,.12)}
.primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:white}
.secondary,.toggle{background:#efe4f5;color:var(--primary-dark)}
.toggle{width:100%;margin-bottom:14px}
.error{margin-top:15px;color:white;background:var(--danger);padding:13px 15px;border-radius:14px;font-weight:700}
.output-card{border-color:#cfe9e2}
.output-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px}
.output-grid div{background:linear-gradient(180deg,#f2fbf8,#fff);border:1px solid #cfe9e2;padding:18px;border-radius:18px}
.output-grid span{display:block;color:var(--muted);font-size:14px;font-weight:800;margin-bottom:8px}
.output-grid strong{font-size:clamp(20px,4vw,28px);letter-spacing:2px;font-family:Consolas,"Courier New",monospace;color:var(--success);word-break:break-all}
.ref-grid{display:grid;grid-template-columns:1fr;gap:18px;overflow:auto;padding-bottom:4px}
.ref{border-collapse:separate;border-spacing:0;min-width:720px;width:100%;overflow:hidden;border-radius:14px;border:1px solid var(--line)}
.ref th{background:var(--primary);color:white}
.ref th,.ref td{border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:11px;text-align:center;font-family:Consolas,"Courier New",monospace}
.ref tr:last-child th,.ref tr:last-child td{border-bottom:0}
.ref th:last-child,.ref td:last-child{border-right:0}
.matrix-ref{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin-top:18px}
.matrix-ref div{background:var(--surface-soft);border:1px solid var(--line);padding:16px;border-radius:18px;min-height:110px}
.matrix-ref b{color:var(--primary-dark)}
pre,code{font-family:Consolas,"Courier New",monospace}
pre{margin:10px 0 0;line-height:1.5}
.key-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(245px,1fr));gap:12px}
.key-grid div{border:1px solid var(--line);border-radius:16px;padding:13px;background:var(--surface-soft)}
.key-grid span{display:block;color:var(--muted);font-weight:900;margin-bottom:6px}
.key-grid code{word-break:break-all;color:var(--primary-dark)}
.step{border:1px solid var(--line);border-radius:22px;padding:18px;margin-top:16px;background:linear-gradient(180deg,#fff,#fcf9ff)}
.step h3{margin-top:0}
.state-wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(235px,1fr));gap:18px;align-items:start}
.state-matrix{display:grid;grid-template-columns:repeat(2,minmax(74px,92px));gap:10px}
.state-matrix div{
  min-height:74px;
  border:2px solid #d8c4e5;
  border-radius:18px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:#fff;
  box-shadow:inset 0 0 0 1px rgba(111,52,138,.04);
}
.state-matrix b{font-size:26px;color:var(--primary);line-height:1}
.state-matrix small{font-family:Consolas,"Courier New",monospace;color:var(--muted);margin-top:6px;font-size:12px}
.notes{line-height:1.7;background:#f7f1fb;border:1px solid var(--line);border-radius:16px;padding:14px 14px 14px 34px;margin:16px 0 0}
.small{color:var(--muted)}
.hidden{display:none}
@media(max-width:720px){
  .hero{padding:32px 14px 62px}
  .container{padding:0 12px 24px}
  .card{border-radius:20px;padding:18px;margin:14px 0}
  .actions{flex-direction:column}
  .actions button{width:100%}
  .radio-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  input[type=text],input[name=text],input[name=key]{font-size:16px;letter-spacing:1.4px;padding:14px}
  .state-wrap{grid-template-columns:1fr}
  .state-matrix{grid-template-columns:repeat(2,1fr);width:100%}
  .state-matrix div{min-height:78px}
  .output-grid{grid-template-columns:1fr}
}
@media(max-width:430px){
  .radio-row{grid-template-columns:1fr}
  .badge{font-size:12px}
  .ref{min-width:660px}
}