@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  --bg-primary:   #0f172a;
  --bg-secondary: #1e293b;
  --bg-card:      rgba(30, 41, 59, 0.8);
  --bg-input:     #1e293b;
  --bg-hover:     #253347;
  --border:       rgba(59, 130, 246, 0.15);
  --border-light: rgba(148, 163, 184, 0.1);
  --text-primary: #f8fafc;
  --text-secondary:#cbd5e1;
  --text-muted:   #94a3b8;
  --grad-primary: linear-gradient(135deg, #3b82f6, #60a5fa);
  --accent-blue:  #3b82f6;
  --accent-purple:#a78bfa;
  --accent-orange:#fb923c;
  --accent-green: #34d399;
  --accent-cyan:  #60a5fa;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-card: 0 4px 24px rgba(0,0,0,.4);
  --transition: .2s ease;
  --font-main: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-main);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh}
.container{max-width:960px;margin:0 auto;padding:0 20px}

/* HEADER */
header{background:linear-gradient(180deg,#0D1117 0%,#111827 100%);border-bottom:1px solid var(--border);padding:28px 0 32px;text-align:center;position:relative;overflow:hidden}
header::before{content:'';position:absolute;top:-60px;left:50%;transform:translateX(-50%);width:600px;height:300px;background:radial-gradient(ellipse,rgba(91,110,234,.18) 0%,transparent 70%);pointer-events:none}
.logo-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.05);border:1px solid var(--border);border-radius:999px;padding:5px 14px;font-size:13px;color:var(--text-secondary);margin-bottom:16px;backdrop-filter:blur(6px)}
.logo-icon{font-size:16px}
h1{font-size:clamp(26px,5vw,42px);font-weight:800;background:var(--grad-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-.5px;margin-bottom:8px}
.header-sub{color:var(--text-secondary);font-size:14px}

/* MAIN */
main{padding:32px 0 48px}

/* AD SLOTS */
.ad-slot{background:var(--bg-secondary);border:1px dashed var(--border);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:12px;letter-spacing:1px}
.ad-slot-top{height:90px;margin-bottom:28px}
.ad-slot-mid{height:250px;margin:32px 0}

/* MODE TABS */
.mode-tabs{display:flex;gap:8px;margin-bottom:24px;flex-wrap:wrap}
.mode-tab{display:flex;flex-direction:column;align-items:center;gap:4px;padding:10px 20px;background:var(--bg-card);border:1.5px solid var(--border);border-radius:var(--radius-md);color:var(--text-secondary);font-family:var(--font-main);font-size:13px;font-weight:500;cursor:pointer;transition:all var(--transition);flex:1;min-width:90px}
.mode-tab:hover{background:var(--bg-hover);color:var(--text-primary);border-color:#5B6EEA}
.mode-tab.active{background:linear-gradient(135deg,rgba(91,110,234,.2) 0%,rgba(155,89,246,.2) 100%);border-color:#5B6EEA;color:var(--text-primary);box-shadow:0 0 16px rgba(91,110,234,.2)}
.mode-icon{font-size:20px}
.mode-label{font-size:12px}

/* PANELS */
.mode-panel{display:none;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:28px;box-shadow:var(--shadow-card);margin-bottom:24px;animation:fadeIn .25s ease}
.mode-panel.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}

/* VERSION PILLS */
.gen-version-row{display:flex;align-items:center;gap:16px;margin-bottom:20px;flex-wrap:wrap}
.version-label{font-size:13px;font-weight:600;color:var(--text-secondary);white-space:nowrap}
.version-pills{display:flex;gap:8px;flex-wrap:wrap}
.vpill{display:flex;align-items:center;gap:6px;padding:8px 18px;background:var(--bg-secondary);border:1.5px solid var(--border);border-radius:999px;color:var(--text-secondary);font-family:var(--font-main);font-size:14px;font-weight:600;cursor:pointer;transition:all var(--transition)}
.vpill:hover{border-color:#5B6EEA;color:var(--text-primary)}
.vpill.active{background:rgba(91,110,234,.15);border-color:#5B6EEA;color:#fff;box-shadow:0 0 12px rgba(91,110,234,.25)}
.vpill-sub{font-size:10px;font-weight:400;color:inherit;opacity:.7}

/* V5 INPUTS */
.v5-inputs{background:rgba(91,110,234,.06);border:1px solid rgba(91,110,234,.2);border-radius:var(--radius-md);padding:16px;margin-bottom:20px;display:none}
.v5-inputs.show{display:block}
.input-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.input-group{display:flex;flex-direction:column;gap:6px}
.input-label{font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.6px}
.styled-input,.styled-select,.styled-textarea{background:var(--bg-input);border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:10px 14px;font-family:var(--font-main);font-size:14px;color:var(--text-primary);outline:none;transition:border-color var(--transition),box-shadow var(--transition);width:100%}
.styled-input:focus,.styled-select:focus,.styled-textarea:focus{border-color:#5B6EEA;box-shadow:0 0 0 3px rgba(91,110,234,.15)}
.styled-input::placeholder,.styled-textarea::placeholder{color:var(--text-muted)}
.styled-select{cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238B949E' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center}
.styled-select option{background:var(--bg-card)}
.styled-textarea{resize:vertical;min-height:120px;font-size:13px;line-height:1.6}

/* FORMAT TOGGLES */
.format-row{display:flex;align-items:center;gap:16px;margin-bottom:20px;flex-wrap:wrap}
.format-label{font-size:13px;font-weight:600;color:var(--text-secondary);white-space:nowrap}
.format-toggles{display:flex;gap:16px;flex-wrap:wrap}
.toggle-item{display:flex;align-items:center;gap:8px;cursor:pointer;user-select:none}
.toggle-item input[type=checkbox]{display:none}
.toggle-track{width:36px;height:20px;background:var(--bg-secondary);border:1.5px solid var(--border);border-radius:999px;position:relative;transition:all var(--transition);flex-shrink:0}
.toggle-item input:checked+.toggle-track{background:rgba(91,110,234,.3);border-color:#5B6EEA}
.toggle-thumb{position:absolute;top:2px;left:2px;width:14px;height:14px;background:var(--text-muted);border-radius:50%;transition:all var(--transition)}
.toggle-item input:checked+.toggle-track .toggle-thumb{left:16px;background:#5B6EEA}
.toggle-text{font-size:13px;color:var(--text-secondary)}
.toggle-item:hover .toggle-text{color:var(--text-primary)}

/* UUID OUTPUT */
.uuid-output-card{background:linear-gradient(135deg,rgba(91,110,234,.08) 0%,rgba(155,89,246,.08) 100%);border:1.5px solid rgba(91,110,234,.3);border-radius:var(--radius-lg);padding:28px 24px;text-align:center;margin-bottom:20px;position:relative}
.uuid-display{font-family:var(--font-mono);font-size:clamp(14px,2.2vw,22px);font-weight:600;color:var(--text-primary);letter-spacing:.5px;word-break:break-all;margin-bottom:10px;transition:all .3s ease;min-height:32px}
.uuid-display.flash{animation:uuidFlash .35s ease}
@keyframes uuidFlash{0%{opacity:1}30%{opacity:.3}100%{opacity:1}}
.uuid-meta{font-size:12px;color:var(--text-muted);margin-bottom:20px;min-height:18px}
.uuid-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}
.btn-icon{display:inline-flex;align-items:center;gap:7px;padding:9px 18px;background:var(--bg-secondary);border:1.5px solid var(--border);border-radius:999px;color:var(--text-primary);font-family:var(--font-main);font-size:13px;font-weight:500;cursor:pointer;transition:all var(--transition)}
.btn-icon:hover{background:var(--bg-hover);border-color:#5B6EEA;transform:translateY(-1px)}
.btn-icon.btn-secondary{color:var(--text-secondary)}
.btn-icon.btn-secondary:hover{color:var(--text-primary)}
.btn-icon.copied{background:rgba(63,185,80,.1);border-color:var(--accent-green);color:var(--accent-green)}

/* QUICK CHIPS */
.quick-chips{display:flex;gap:8px;flex-wrap:wrap}
.quick-chip{padding:6px 14px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:999px;font-size:12px;color:var(--text-secondary);cursor:pointer;transition:all var(--transition);font-family:var(--font-mono)}
.quick-chip:hover{border-color:rgba(91,110,234,.5);color:var(--text-primary);background:var(--bg-hover)}

/* BULK */
.bulk-controls{display:grid;grid-template-columns:1fr auto;gap:20px;margin-bottom:16px;align-items:start}
.bulk-left{display:flex;gap:12px;flex-wrap:wrap}
.bulk-right{display:flex;flex-direction:column;gap:10px;padding-top:20px}
.count-row{display:flex;align-items:center;gap:6px}
.count-btn{width:32px;height:38px;background:var(--bg-secondary);border:1.5px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:18px;font-weight:600;cursor:pointer;transition:all var(--transition);display:flex;align-items:center;justify-content:center}
.count-btn:hover{background:var(--bg-hover);border-color:#5B6EEA}
.count-input{width:70px;background:var(--bg-input);border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:8px;font-family:var(--font-mono);font-size:16px;font-weight:600;color:var(--text-primary);text-align:center;outline:none;transition:border-color var(--transition)}
.count-input:focus{border-color:#5B6EEA}
.count-input::-webkit-outer-spin-button,.count-input::-webkit-inner-spin-button{-webkit-appearance:none}
.count-input[type=number]{-moz-appearance:textfield}

.bulk-actions{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.btn-primary{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;background:linear-gradient(135deg,#5B6EEA,#9B59F6);border:none;border-radius:999px;color:#fff;font-family:var(--font-main);font-size:14px;font-weight:600;cursor:pointer;transition:all var(--transition);box-shadow:0 4px 16px rgba(91,110,234,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(91,110,234,.45)}
.btn-secondary-outline{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;background:none;border:1.5px solid var(--border);border-radius:999px;color:var(--text-secondary);font-family:var(--font-main);font-size:13px;font-weight:500;cursor:pointer;transition:all var(--transition)}
.btn-secondary-outline:hover:not(:disabled){border-color:#5B6EEA;color:var(--text-primary);background:var(--bg-hover)}
.btn-secondary-outline:disabled{opacity:.4;cursor:not-allowed}

.bulk-stats{font-size:12px;color:var(--text-muted);margin-bottom:8px;min-height:18px}
.bulk-output{width:100%;min-height:320px;background:var(--bg-input);border:1.5px solid var(--border);border-radius:var(--radius-md);padding:16px;font-family:var(--font-mono);font-size:13px;color:var(--text-primary);resize:vertical;outline:none;transition:border-color var(--transition);line-height:1.8}
.bulk-output:focus{border-color:rgba(91,110,234,.5)}

/* VALIDATE */
.validate-input-wrap{margin-bottom:20px}
.validate-btn-row{display:flex;gap:10px;margin-top:12px}
.validate-results{display:flex;flex-direction:column;gap:8px}
.val-row{display:flex;align-items:flex-start;gap:12px;padding:12px 16px;border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-secondary);animation:fadeIn .2s ease}
.val-row.valid{border-color:rgba(63,185,80,.3);background:rgba(63,185,80,.05)}
.val-row.invalid{border-color:rgba(255,123,84,.3);background:rgba(255,123,84,.05)}
.val-icon{font-size:18px;flex-shrink:0;margin-top:1px}
.val-uuid{font-family:var(--font-mono);font-size:13px;color:var(--text-primary);word-break:break-all;margin-bottom:4px}
.val-detail{font-size:12px;color:var(--text-muted)}
.val-badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:11px;font-weight:600;margin-left:8px}
.val-badge.v1{background:rgba(88,166,255,.15);color:var(--accent-blue)}
.val-badge.v4{background:rgba(63,185,80,.15);color:var(--accent-green)}
.val-badge.v5{background:rgba(188,140,255,.15);color:var(--accent-purple)}
.val-badge.v3{background:rgba(255,123,84,.15);color:var(--accent-orange)}
.val-badge.v2{background:rgba(18,216,250,.15);color:var(--accent-cyan)}
.val-badge.unknown{background:rgba(139,148,158,.15);color:var(--text-secondary)}

/* DECODE */
.decode-input-wrap{margin-bottom:20px}
.decode-row{display:flex;gap:10px;margin-top:8px}
.decode-row .styled-input{flex:1}
.decode-hint{font-size:12px;color:var(--text-muted);margin-top:8px}
.decode-result{display:none}
.decode-result.show{display:block;animation:fadeIn .25s ease}
.decode-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px}
.decode-item{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-md);padding:14px}
.decode-item-label{font-size:11px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.6px;margin-bottom:6px}
.decode-item-val{font-family:var(--font-mono);font-size:14px;font-weight:600;color:var(--text-primary);word-break:break-all}
.decode-item-sub{font-size:11px;color:var(--text-muted);margin-top:4px}
.decode-error{background:rgba(255,123,84,.08);border:1px solid rgba(255,123,84,.3);border-radius:var(--radius-md);padding:16px;color:var(--accent-orange);font-size:14px}

/* INFO GRID */
.info-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;margin-bottom:24px}
.info-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;transition:all var(--transition)}
.info-card:hover{border-color:rgba(91,110,234,.4);transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.3)}
.info-card-icon{font-size:28px;margin-bottom:10px}
.info-card-title{font-size:15px;font-weight:700;color:var(--text-primary);margin-bottom:8px}
.info-card-desc{font-size:13px;color:var(--text-secondary);line-height:1.6}

/* CARD */
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:24px;box-shadow:var(--shadow-card);margin-bottom:24px}
.card-title{font-size:15px;font-weight:700;color:var(--text-primary);display:flex;align-items:center;gap:10px;margin-bottom:18px}
.icon{width:30px;height:30px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}
.icon-blue{background:rgba(88,166,255,.15)}

/* FAQ */
.faq-list{display:flex;flex-direction:column;gap:8px}
.faq-item{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;transition:border-color var(--transition)}
.faq-item[open]{border-color:rgba(91,110,234,.35)}
.faq-q{padding:14px 18px;font-size:14px;font-weight:600;color:var(--text-primary);cursor:pointer;list-style:none;display:flex;align-items:center;gap:8px;user-select:none}
.faq-q::before{content:'▶';font-size:10px;color:var(--text-muted);transition:transform .2s}
.faq-item[open] .faq-q::before{transform:rotate(90deg)}
.faq-q::-webkit-details-marker{display:none}
.faq-a{padding:0 18px 14px;font-size:13px;color:var(--text-secondary);line-height:1.7;border-top:1px solid var(--border-light);padding-top:10px}
.faq-a code{font-family:var(--font-mono);background:rgba(91,110,234,.12);padding:1px 6px;border-radius:4px;font-size:12px;color:var(--accent-purple)}

/* TOAST */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(80px);background:var(--bg-hover);border:1px solid var(--border);border-radius:999px;padding:10px 22px;font-size:13px;color:var(--text-primary);box-shadow:0 8px 32px rgba(0,0,0,.5);opacity:0;transition:all .35s cubic-bezier(.34,1.56,.64,1);pointer-events:none;z-index:9999;white-space:nowrap}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* FOOTER */
footer{background:var(--bg-secondary);border-top:1px solid var(--border);padding:24px 0;text-align:center;color:var(--text-muted);font-size:13px}
.footer-links{display:flex;justify-content:center;gap:20px;margin-top:12px;flex-wrap:wrap}
.footer-links a{color:var(--text-muted);text-decoration:none;font-size:12px;transition:color var(--transition)}
.footer-links a:hover{color:var(--accent-blue)}

/* RESPONSIVE */
@media(max-width:700px){
  .bulk-controls{grid-template-columns:1fr}
  .bulk-right{flex-direction:row;flex-wrap:wrap;padding-top:0}
  .input-row{grid-template-columns:1fr}
  .info-grid{grid-template-columns:1fr 1fr}
  .decode-grid{grid-template-columns:1fr 1fr}
  .uuid-display{font-size:13px}
}
@media(max-width:480px){
  .version-pills{gap:6px}
  .vpill{padding:7px 12px;font-size:13px}
  .info-grid{grid-template-columns:1fr}
}