:root{
  --ink-950:#0d1117; --ink-900:#131a26; --ink-850:#161e2c; --ink-800:#1b2537; --ink-700:#243248;
  --accent:#3ee8c4; --accent-2:#7c6cf7; --danger:#ff6b6b; --warn:#ffc861; --ok:#3ee8c4;
  --text:#e8edf6; --text-dim:#93a1b8; --border:#242f45; --radius:12px;
}
*{box-sizing:border-box}
body{margin:0;font-family:'Segoe UI',Roboto,system-ui,sans-serif;background:var(--ink-950);color:var(--text);font-size:14px}
a{color:inherit;text-decoration:none}
.app{display:flex;min-height:100vh}

/* Sidebar */
.sidebar{
  width:240px;background:linear-gradient(180deg,var(--ink-900),var(--ink-850));
  border-right:1px solid var(--border);padding:22px 16px;position:sticky;top:0;height:100vh;
}
.brand{display:flex;align-items:center;gap:10px;padding:0 6px 22px;margin-bottom:16px;border-bottom:1px solid var(--border)}
.brand .mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:flex;align-items:center;justify-content:center;font-weight:800;color:#0d1117}
.brand b{font-size:15px}
.nav a{
  display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;color:var(--text-dim);
  font-weight:600;font-size:13.5px;margin-bottom:2px;transition:.15s;
}
.nav a:hover{background:var(--ink-800);color:var(--text)}
.nav a.active{background:rgba(62,232,196,.1);color:var(--accent)}
.nav .icon{width:18px;text-align:center}
.nav-section{font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;color:#5b6577;margin:16px 6px 8px;font-weight:700}

/* Main */
.main{flex:1;min-width:0}
.topbar{
  display:flex;align-items:center;justify-content:space-between;padding:16px 28px;
  border-bottom:1px solid var(--border);background:var(--ink-900);position:sticky;top:0;z-index:5;
}
.topbar h1{font-size:18px;margin:0}
.topbar .user{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--text-dim)}
.content{padding:26px 28px 60px}

/* Cards */
.card{background:var(--ink-900);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.card + .card{margin-top:16px}
.grid{display:grid;gap:16px}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.grid.cols-4,.grid.cols-3,.grid.cols-2{grid-template-columns:1fr}}

.stat{background:linear-gradient(160deg,var(--ink-900),var(--ink-850));border:1px solid var(--border);border-radius:var(--radius);padding:18px}
.stat .num{font-size:26px;font-weight:800;color:var(--accent)}
.stat .lbl{font-size:12px;color:var(--text-dim);margin-top:4px}

/* Forms */
label{display:block;font-size:12px;color:var(--text-dim);margin-bottom:6px;font-weight:600}
.field{margin-bottom:16px}
input[type=text],input[type=password],input[type=email],input[type=number],input[type=datetime-local],select,textarea{
  width:100%;padding:10px 12px;border-radius:9px;border:1px solid var(--border);background:var(--ink-950);
  color:var(--text);font-size:13.5px;outline:none;font-family:inherit;
}
input:focus,select:focus,textarea:focus{border-color:var(--accent)}
textarea{resize:vertical}
.help{font-size:12px;color:var(--text-dim);margin-top:5px;display:flex;gap:6px;align-items:flex-start}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:7px;padding:10px 18px;border-radius:9px;border:none;cursor:pointer;font-weight:700;font-size:13.5px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#0d1117}
.btn.secondary{background:var(--ink-700);color:var(--text)}
.btn.danger{background:rgba(255,107,107,.15);color:var(--danger)}
.btn.ghost{background:transparent;border:1px solid var(--border);color:var(--text-dim)}
.btn.sm{padding:6px 12px;font-size:12.5px}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* Table */
table.list{width:100%;border-collapse:collapse}
table.list th{text-align:left;font-size:11.5px;text-transform:uppercase;letter-spacing:.04em;color:var(--text-dim);padding:10px 12px;border-bottom:1px solid var(--border)}
table.list td{padding:12px;border-bottom:1px solid var(--border);font-size:13.5px}
table.list tr:hover td{background:rgba(255,255,255,.02)}

.badge{padding:3px 10px;border-radius:20px;font-size:11px;font-weight:700;display:inline-block}
.badge.ok{background:rgba(62,232,196,.15);color:var(--ok)}
.badge.warn{background:rgba(255,200,97,.15);color:var(--warn)}
.badge.fail{background:rgba(255,107,107,.15);color:var(--danger)}
.badge.muted{background:var(--ink-700);color:var(--text-dim)}

.alert{padding:12px 14px;border-radius:10px;margin-bottom:16px;font-size:13.5px}
.alert.error{background:rgba(255,107,107,.12);color:#ffb3b3;border:1px solid rgba(255,107,107,.3)}
.alert.success{background:rgba(62,232,196,.12);color:var(--accent);border:1px solid rgba(62,232,196,.3)}
.alert.info{background:rgba(124,108,247,.12);color:#cabcff;border:1px solid rgba(124,108,247,.3)}

/* Tooltip / hint system ("обучение") */
.tip{
  display:inline-flex;align-items:center;justify-content:center;width:16px;height:16px;border-radius:50%;
  background:var(--ink-700);color:var(--text-dim);font-size:11px;font-weight:700;cursor:help;position:relative;flex-shrink:0;
}
.tip .bubble{
  display:none;position:absolute;bottom:130%;left:50%;transform:translateX(-50%);
  width:250px;background:var(--ink-800);border:1px solid var(--border);border-radius:10px;padding:10px 12px;
  font-size:12px;font-weight:400;color:var(--text);line-height:1.5;z-index:20;box-shadow:0 10px 30px rgba(0,0,0,.4);
}
.tip:hover .bubble{display:block}

.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:18px}
.tabs a{padding:10px 16px;font-size:13px;font-weight:600;color:var(--text-dim);border-bottom:2px solid transparent}
.tabs a.active{color:var(--accent);border-bottom-color:var(--accent)}

.pill-toggle{display:inline-flex;background:var(--ink-950);border:1px solid var(--border);border-radius:20px;padding:3px}
.pill-toggle a{padding:6px 14px;border-radius:16px;font-size:12.5px;font-weight:600;color:var(--text-dim)}
.pill-toggle a.active{background:var(--accent);color:#0d1117}

/* Login page */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(1200px 600px at 10% -10%,#1b2c4a 0,transparent 60%),radial-gradient(1000px 600px at 110% 10%,#2a1b4a 0,transparent 55%),var(--ink-950);}
.login-box{width:100%;max-width:380px;background:var(--ink-900);border:1px solid var(--border);border-radius:16px;padding:32px;box-shadow:0 30px 80px rgba(0,0,0,.4)}

/* Editor toolbar */
.editor-wrap{border:1px solid var(--border);border-radius:10px;overflow:hidden}
.editor-toolbar{display:flex;flex-wrap:wrap;gap:2px;padding:8px;background:var(--ink-850);border-bottom:1px solid var(--border)}
.editor-toolbar button{
  background:var(--ink-800);border:1px solid var(--border);color:var(--text);border-radius:6px;
  width:32px;height:30px;cursor:pointer;font-size:13px;font-weight:700;
}
.editor-toolbar button:hover{background:var(--ink-700)}
.editor-toolbar .sep{width:1px;background:var(--border);margin:2px 4px}
.editor-canvas{min-height:280px;padding:16px;background:#fff;color:#111;outline:none;font-size:14px;line-height:1.6}
.editor-source{width:100%;min-height:280px;border:none;background:var(--ink-950);color:var(--accent);font-family:Consolas,Monaco,monospace;font-size:12.5px;padding:16px}

.upload-drop{border:2px dashed var(--border);border-radius:10px;padding:26px;text-align:center;color:var(--text-dim);font-size:13px}
.chip{display:inline-flex;align-items:center;gap:6px;background:var(--ink-800);border:1px solid var(--border);padding:5px 10px;border-radius:8px;font-size:12px;margin:3px}