*{margin:0;padding:0;box-sizing:border-box}
:root{
--bg:#0d1117;--surface:#161b22;--surface2:#21262d;--border:#30363d;
--text:#c9d1d9;--text-dim:#8b949e;--text-muted:#484f58;
--accent:#58a6ff;--accent2:#238636;--danger:#da3633;--warning:#d29922;
--sidebar-w:220px;--header-h:52px
}
html,body{height:100%;overflow:hidden}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,monospace;background:var(--bg);color:var(--text)}

/* ── Layout ─────────────────────────────────── */
.layout{display:flex;height:100vh}

/* ── Sidebar ─────────────────────────────────── */
.sidebar{
  width:var(--sidebar-w);min-width:var(--sidebar-w);height:100vh;
  background:var(--surface);border-right:1px solid var(--border);
  display:flex;flex-direction:column;overflow:hidden;transition:width .2s,min-width .2s;
  flex-shrink:0;
}
.sidebar.collapsed{width:48px;min-width:48px}

.sidebar-header{
  height:var(--header-h);min-height:var(--header-h);
  border-bottom:1px solid var(--border);display:flex;align-items:center;
  padding:0 12px;gap:8px;flex-shrink:0;
}
.sidebar-logo{width:24px;height:24px;background:var(--accent);border-radius:6px;display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff;font-size:14px;flex-shrink:0}
.sidebar-title{font-size:14px;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;transition:opacity .2s}
.sidebar.collapsed .sidebar-title{opacity:0;width:0}

.sidebar-toggle{
  width:28px;height:28px;border-radius:6px;border:1px solid var(--border);
  background:transparent;cursor:pointer;color:var(--text-dim);font-size:16px;
  display:flex;align-items:center;justify-content:center;margin-left:auto;flex-shrink:0;
  transition:background .15s,color .15s;
}
.sidebar-toggle:hover{background:var(--border);color:var(--text)}

.sidebar-search{padding:8px 12px;border-bottom:1px solid var(--border);flex-shrink:0}
.sidebar-search input{
  width:100%;background:var(--bg);border:1px solid var(--border);border-radius:6px;
  color:var(--text);font-size:12px;padding:5px 8px;outline:none;
}
.sidebar-search input:focus{border-color:var(--accent)}
.sidebar-search input::placeholder{color:var(--text-muted)}

.sidebar-scroll{flex:1;overflow-y:auto;overflow-x:hidden;padding:4px 0}
.sidebar-scroll::-webkit-scrollbar{width:4px}
.sidebar-scroll::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}

/* Category */
.cat{margin-bottom:2px}
.cat-label{
  display:flex;align-items:center;gap:6px;padding:6px 12px;font-size:11px;
  color:var(--text-muted);text-transform:uppercase;letter-spacing:.6px;
  cursor:pointer;user-select:none;white-space:nowrap;
  transition:color .15s;
}
.cat-label:hover{color:var(--text-dim)}
.cat-icon{font-size:12px;width:16px;text-align:center;flex-shrink:0}
.cat-arrow{width:16px;text-align:center;font-size:10px;margin-left:auto;transition:transform .2s;flex-shrink:0}
.cat.collapsed .cat-arrow{transform:rotate(-90deg)}
.cat.collapsed .cat-items{display:none}

.cat-items{padding:2px 0 4px 0}
.cat-item{
  display:flex;align-items:center;gap:8px;padding:7px 12px 7px 28px;
  font-size:13px;color:var(--text-dim);cursor:pointer;border-radius:0;
  transition:background .1s,color .1s;white-space:nowrap;overflow:hidden;
  position:relative;
}
.cat-item:hover{background:var(--surface2);color:var(--text)}
.cat-item.active{color:var(--accent);background:rgba(88,166,255,.08)}
.cat-item.active::before{content:'';position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--accent)}
.cat-item-icon{font-size:14px;width:18px;text-align:center;flex-shrink:0}

/* ── Main ─────────────────────────────────────── */
.main{flex:1;display:flex;flex-direction:column;overflow:hidden}

.main-header{
  height:var(--header-h);min-height:var(--header-h);
  border-bottom:1px solid var(--border);display:flex;align-items:center;
  padding:0 24px;gap:12px;flex-shrink:0;
}
.main-title{font-size:16px;font-weight:600}
.main-subtitle{font-size:12px;color:var(--text-dim)}
.header-badge{
  margin-left:auto;padding:3px 10px;border-radius:12px;font-size:11px;
  background:var(--surface);border:1px solid var(--border);color:var(--text-dim);
}

.main-content{flex:1;overflow-y:auto;padding:24px}

/* ── Cards ────────────────────────────────────── */
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:10px;
  padding:20px 24px;margin-bottom:16px;
}
.card-title{
  font-size:11px;color:var(--text-muted);margin-bottom:14px;
  text-transform:uppercase;letter-spacing:.6px;
}

/* ── Form elements ───────────────────────────── */
textarea{
  width:100%;background:var(--bg);border:1px solid var(--border);border-radius:6px;
  color:var(--text);font-family:monospace;font-size:13px;padding:12px;
  resize:vertical;outline:none;line-height:1.5;
}
textarea:focus{border-color:var(--accent)}
input[type="text"],input[type="password"],input[type="number"]{
  width:100%;background:var(--bg);border:1px solid var(--border);border-radius:6px;
  color:var(--text);font-family:monospace;font-size:13px;padding:8px 12px;outline:none;
}
input:focus{border-color:var(--accent)}
input[type="range"]{width:100%;cursor:pointer}
input[type="color"]{width:48px;height:32px;border:none;cursor:pointer;background:none;padding:0}
input[type="file"]{display:none}
select{
  background:var(--bg);border:1px solid var(--border);border-radius:6px;
  color:var(--text);font-size:13px;padding:8px 12px;outline:none;cursor:pointer;
}
select:focus{border-color:var(--accent)}

.btn{
  display:inline-flex;align-items:center;gap:5px;padding:7px 14px;
  border-radius:6px;border:1px solid var(--border);background:var(--surface);
  color:var(--text);font-size:13px;cursor:pointer;transition:all .15s;white-space:nowrap;
}
.btn:hover{background:var(--border)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{opacity:.85}
.btn.danger{background:var(--danger);border-color:var(--danger);color:#fff}
.btn.sm{padding:4px 10px;font-size:12px}
.btn-row{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* Result */
.result{
  background:var(--bg);border:1px solid var(--border);border-radius:6px;
  padding:12px;margin-top:10px;position:relative;
}
.result-label{font-size:11px;color:var(--text-dim);margin-bottom:6px}
.result code{font-size:12px;word-break:break-all;white-space:pre-wrap;line-height:1.5}
.copy-btn{position:absolute;top:8px;right:8px;padding:3px 8px;font-size:11px}
.toast{
  position:fixed;bottom:24px;right:24px;background:var(--accent2);color:#fff;
  padding:10px 20px;border-radius:8px;font-size:13px;opacity:0;
  transition:opacity .3s;pointer-events:none;z-index:9999;
}
.toast.show{opacity:1}

/* ── Layout helpers ───────────────────────────── */
.row{display:flex;gap:12px;align-items:flex-start;flex-wrap:wrap}
.col2{grid-template-columns:1fr 1fr !important}
.col3{grid-template-columns:1fr 1fr 1fr !important}
.grid{display:grid;gap:12px}
.three-col{grid-template-columns:repeat(3,1fr)}
.four-col{grid-template-columns:repeat(4,1fr)}
.gap-8{gap:8px !important}

/* ── Color tools ──────────────────────────────── */
.color-box{display:flex;gap:12px;margin-top:10px;align-items:center;flex-wrap:wrap}
.swatch{width:52px;height:52px;border-radius:10px;border:1px solid var(--border);flex-shrink:0}
.color-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;align-items:end}

/* ── JWT ─────────────────────────────────────── */
.jwt-header,.jwt-payload,.jwt-sign{background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:12px;margin-bottom:8px}
.jwt-header .lbl,.jwt-payload .lbl,.jwt-sign .lbl{font-size:11px;color:var(--text-dim);margin-bottom:6px}
.jwt-header code,.jwt-payload code,.jwt-sign code{font-size:12px;word-break:break-all}

/* ── Regex ───────────────────────────────────── */
.regex-result{margin-top:8px;font-size:12px;min-height:20px}
.regex-match{padding:2px 7px;border-radius:3px;background:rgba(88,166,255,.15);color:var(--accent);margin:2px;display:inline-block}
.regex-no-match{color:var(--text-dim)}

/* ── Cron ────────────────────────────────────── */
.cron-preview{font-size:12px;color:var(--text-dim);margin-top:8px;line-height:1.6}
.cron-select{width:100%;background:var(--bg);border:1px solid var(--border);border-radius:6px;color:var(--text);padding:8px;font-size:13px;outline:none}

/* ── Markdown ───────────────────────────────── */
.md-split{display:grid;grid-template-columns:1fr 1fr;gap:12px;height:340px}
.md-split textarea{height:100%}
#md-preview{
  background:var(--bg);border:1px solid var(--border);border-radius:6px;
  padding:16px;height:100%;overflow-y:auto;font-size:14px;line-height:1.6;
}
#md-preview h1,#md-preview h2,#md-preview h3{color:var(--accent);margin:12px 0 6px}
#md-preview h1{font-size:20px;border-bottom:1px solid var(--border);padding-bottom:8px}
#md-preview h2{font-size:17px}
#md-preview h3{font-size:15px}
#md-preview code{background:var(--surface);padding:2px 6px;border-radius:3px;font-size:12px}
#md-preview pre{background:var(--surface);padding:12px;border-radius:6px;overflow-x:auto;margin:8px 0}
#md-preview pre code{background:none;padding:0}
#md-preview blockquote{border-left:3px solid var(--accent);padding-left:12px;color:var(--text-dim);margin:8px 0}
#md-preview table{border-collapse:collapse;width:100%;margin:8px 0}
#md-preview td,#md-preview th{border:1px solid var(--border);padding:6px 10px}
#md-preview th{background:var(--surface)}

/* ── OCR ─────────────────────────────────────── */
#ocr-image{border:2px dashed var(--border);border-radius:8px;padding:24px;text-align:center;cursor:pointer;transition:border-color .15s}
#ocr-image:hover{border-color:var(--accent}
#ocr-image img{max-width:100%;max-height:180px;border-radius:6px;margin-bottom:10px}
#ocr-text{height:100px}
.crop-btn{margin-top:8px}

/* ── UUID ────────────────────────────────────── */
.uuid-list{display:flex;flex-direction:column;gap:6px;margin-top:8px}
.uuid-item{display:flex;align-items:center;gap:8px}
.uuid-item code{flex:1;font-size:13px}

/* ── Hash ────────────────────────────────────── */
.hash-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.hash-item{background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:10px;font-size:12px}
.hash-item .lbl{color:var(--text-dim);margin-bottom:4px}

/* ── Password ───────────────────────────────── */
.password-display{background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:14px;margin-bottom:12px;font-size:18px;font-family:monospace;word-break:break-all;position:relative;min-height:52px}
.password-strength{margin:8px 0;height:4px;background:var(--border);border-radius:2px;overflow:hidden}
.password-strength-bar{height:100%;border-radius:2px;transition:width .3s,background .3s}

/* ── Timestamp ───────────────────────────────── */
.ts-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}

/* ── Diff ───────────────────────────────────── */
.diff-container{font-family:monospace;font-size:12px;line-height:1.6;white-space:pre-wrap;word-break:break-all}
.diff-add{background:rgba(35,134,54,.2);color:#3fb950}
.diff-del{background:rgba(218,54,51,.2);color:#f85149}
.diff-context{color:var(--text-dim)}

/* ── Base64 Image ────────────────────────────── */
.img-preview{background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:8px;text-align:center;margin-top:8px}
.img-preview img{max-width:100%;max-height:200px;border-radius:4px}

/* ── Number Base ─────────────────────────────── */
.base-grid{display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:10px}

/* ── QR Code ────────────────────────────────── */
#qr-canvas{border:1px solid var(--border);border-radius:8px;background:#fff;padding:8px;display:inline-block}
.qr-actions{margin-top:10px}

/* ── IP ──────────────────────────────────────── */
.ip-info-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.ip-field{background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:10px 12px}
.ip-field .lbl{font-size:11px;color:var(--text-dim);margin-bottom:4px}
.ip-field .val{font-size:13px}

/* ── Misc ────────────────────────────────────── */
.tag{background:var(--surface);border:1px solid var(--border);padding:2px 8px;border-radius:4px;font-size:11px;color:var(--text-dim)}
.badge-green{background:rgba(35,134,54,.15);color:#3fb950;border-radius:4px;padding:1px 6px;font-size:11px}
.badge-red{background:rgba(218,54,51,.15);color:#f85149;border-radius:4px;padding:1px 6px;font-size:11px}

/* Panel */
.panel{display:none}
.panel.active{display:block}

/* Scrollbar */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}