:root{--bg:#03091d;--panel:#081735;--panel2:#0b2045;--text:#edf6ff;--muted:#91a4c0;--cyan:#16d0ff;--line:rgba(55,190,255,.18);--danger:#ff667a;--green:#4dffae}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;overflow-x:hidden}
body:before{content:"";position:fixed;inset:0;z-index:-3;background:radial-gradient(circle at 15% 10%,rgba(0,122,255,.22),transparent 34%),radial-gradient(circle at 85% 40%,rgba(20,65,255,.15),transparent 42%),linear-gradient(180deg,#061332,#03091d 72%)}
#particles-js{position:fixed;inset:0;z-index:-2;pointer-events:none;opacity:.4}
a{color:inherit}.content{width:min(900px,calc(100% - 28px));margin:auto;padding-bottom:30px}
.navbar{height:72px;border-bottom:1px solid var(--line);background:rgba(3,9,29,.88);backdrop-filter:blur(16px);position:sticky;top:0;z-index:1000}
.nav-container{width:min(1180px,calc(100% - 28px));height:100%;margin:auto;display:flex;align-items:center;justify-content:space-between;position:relative}
.nav-brand a{text-decoration:none;display:flex;align-items:center;gap:9px}
.brand-mark{width:30px;height:30px;border:1px solid rgba(24,215,232,.38);border-radius:9px;display:grid;place-items:center;color:#18d7e8;font:800 11px ui-monospace,monospace;background:rgba(24,215,232,.08)}
.brand-name{font-size:23px;font-weight:800;letter-spacing:-1.1px}.brand-name span,.brand-name b{color:var(--cyan)}.brand-name b{font-weight:900}
.nav-links{display:flex;align-items:center;gap:23px}.nav-links a{text-decoration:none;color:#aebed3;font-size:13px;font-weight:650}.nav-links a:hover{color:#fff}
.hamburger{display:none;width:38px;height:38px;position:relative;cursor:pointer}.hamburger span{position:absolute;left:6px;width:26px;height:3px;background:#fff;border-radius:9px;transition:.25s}.hamburger span:nth-child(1){top:9px}.hamburger span:nth-child(2){top:17px}.hamburger span:nth-child(3){top:25px}.hamburger.active span:nth-child(1){top:17px;transform:rotate(45deg)}.hamburger.active span:nth-child(2){opacity:0}.hamburger.active span:nth-child(3){top:17px;transform:rotate(-45deg)}
.hero{text-align:center;padding:64px 8px 34px}.eyebrow{font-size:10px;font-weight:850;letter-spacing:2px;color:#83a0c7;margin-bottom:13px}.hero h1{margin:0;font-size:clamp(38px,7vw,64px);line-height:1.05;letter-spacing:-2px}.hero h1 span{color:var(--cyan)}.hero p{margin:13px auto 0;color:var(--muted);font-size:15px;line-height:1.6}
.checker-box{padding:26px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(145deg,rgba(13,39,79,.78),rgba(6,18,43,.9));box-shadow:0 20px 60px rgba(0,0,0,.16)}
label{display:block;color:#b9c9dd;font-size:12px;font-weight:700;margin:18px 0 8px}
textarea,input{width:100%;border:1px solid rgba(55,190,255,.2);outline:none;border-radius:13px;background:rgba(2,10,27,.72);color:#edf6ff;font:14px/1.6 ui-monospace,SFMono-Regular,Menlo,monospace;padding:14px;transition:.2s}
textarea:focus,input:focus{border-color:rgba(22,208,255,.65);box-shadow:0 0 0 3px rgba(22,208,255,.08)}
#jwtInput{min-height:150px;resize:vertical}#headerOutput,#payloadOutput{min-height:135px;resize:vertical}
.btn{border:0;border-radius:12px;padding:12px 17px;background:var(--cyan);color:#02101c;font-size:13px;font-weight:850;cursor:pointer;box-shadow:0 10px 28px rgba(0,208,255,.16);margin-top:14px}.btn:hover{filter:brightness(1.08)}.small-btn{padding:9px 13px;margin:8px 6px 0 0}
.jwt-status{margin-top:18px;padding:12px 14px;border-radius:12px;background:rgba(2,10,27,.62);border:1px solid var(--line);color:#a9bbd3;font-size:12px}
.jwt-status.ok{color:var(--green);border-color:rgba(77,255,174,.25)}.jwt-status.error{color:#ff8796;border-color:rgba(255,102,122,.3)}
.metrics{margin-top:14px;padding:14px;border-radius:12px;background:rgba(2,10,27,.5);color:#a9bbd3;font-size:12px}
.actions{display:flex;flex-wrap:wrap;gap:6px}
.back{text-align:center;margin:28px 0}footer{text-align:center;padding:42px 20px;color:#667892;font-size:11px;border-top:1px solid var(--line)}
@media(max-width:768px){.navbar{height:64px}.hamburger{display:block}.nav-links{display:none;position:absolute;top:57px;left:0;right:0;padding:10px;background:rgba(3,10,29,.98);border:1px solid var(--line);border-radius:15px;flex-direction:column;align-items:stretch;gap:0;box-shadow:0 18px 45px rgba(0,0,0,.45)}.nav-links.open{display:flex}.nav-links a{padding:13px;border-bottom:1px solid rgba(55,190,255,.08)}.nav-links a:last-child{border:0}.content{width:calc(100% - 20px)}.hero{padding:48px 4px 28px}.hero h1{font-size:clamp(34px,10vw,48px);letter-spacing:-1.2px}.hero p{font-size:14px}.checker-box{padding:18px 14px;border-radius:18px}textarea,input{font-size:13px}.actions{display:grid;grid-template-columns:1fr 1fr}.actions .btn{width:100%}.actions .btn:first-child{grid-column:1/-1}}