:root{
  --bg:#0d1117; --panel:#161b22; --panel2:#1c2129; --border:#2d333b;
  --text:#e6edf3; --muted:#8b949e; --accent:#4f8cff; --accent2:#7ee787;
  --mono:'SFMono-Regular',Consolas,'Liberation Mono',Menlo,monospace;
  --sidebar:240px; --radius:12px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
button{font-family:inherit;cursor:pointer}
input,textarea,select{font-family:inherit}

/* header public */
.site-header{position:sticky;top:0;z-index:50;background:rgba(13,17,23,.85);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav{max-width:1100px;margin:0 auto;display:flex;align-items:center;gap:24px;padding:14px 20px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.15rem;color:var(--text)}
.logo-mark{width:30px;height:30px;border-radius:8px;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  display:grid;place-items:center;color:#0d1117;font-weight:800;font-size:.95rem;flex:none}
.nav-links{display:flex;gap:20px;margin-left:auto;font-size:.92rem;align-items:center}
.nav-links a{color:var(--muted)}
.nav-links a:hover{color:var(--text);text-decoration:none}
.btn{display:inline-block;background:var(--accent);color:#fff;border:none;border-radius:8px;
  padding:9px 16px;font-size:.88rem;font-weight:600;transition:.15s;text-align:center}
.btn:hover{background:#3d7aee;text-decoration:none;color:#fff}
.btn.ghost{background:var(--panel2);color:var(--text);border:1px solid var(--border)}
.btn.ghost:hover{background:#252b33}

/* hero */
.hero{max-width:1100px;margin:0 auto;padding:72px 20px 40px;text-align:center}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;letter-spacing:-1px;
  background:linear-gradient(135deg,#fff,#8bb8ff);-webkit-background-clip:text;
  background-clip:text;color:transparent}
.hero p{color:var(--muted);font-size:1.1rem;margin-top:14px;max-width:640px;margin-inline:auto}
.hero .cta{margin-top:28px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* sections */
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.section{padding:56px 0}
.section h2{font-size:1.7rem;margin-bottom:10px}
.section p.lead{color:var(--muted);max-width:720px;margin-bottom:24px}
.divider{border-top:1px solid var(--border);max-width:1100px;margin:0 auto}

/* cards grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px;transition:.2s}
.card:hover{border-color:#3d444d;transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.3)}
.card h3{font-size:1.02rem;display:flex;align-items:center;gap:8px;margin-bottom:8px}
.card .tag{font-family:var(--mono);font-size:.68rem;color:var(--muted);font-weight:400;
  background:var(--panel2);padding:2px 7px;border-radius:6px}
.card p{color:var(--muted);font-size:.9rem}

/* forms */
label{display:block;font-size:.75rem;color:var(--muted);margin-bottom:5px;
  text-transform:uppercase;letter-spacing:.5px}
input,textarea,select{width:100%;background:var(--bg);border:1px solid var(--border);
  border-radius:8px;color:var(--text);padding:9px 11px;font-size:.9rem;margin-bottom:12px}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--accent)}
textarea{resize:vertical;min-height:80px;font-family:var(--mono);font-size:.82rem}
.btn-row{display:flex;gap:8px;flex-wrap:wrap}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}

/* footer */
.site-footer{border-top:1px solid var(--border);padding:28px 20px;color:var(--muted);font-size:.85rem}
.foot{max-width:1100px;margin:0 auto;display:flex;flex-wrap:wrap;
  justify-content:space-between;gap:12px}
.foot a{color:var(--muted)}
.foot a:hover{color:var(--text)}

/* login */
.auth-wrap{min-height:calc(100vh - 60px);display:grid;place-items:center;padding:20px}
.auth-box{background:var(--panel);border:1px solid var(--border);border-radius:14px;
  padding:36px 32px;width:100%;max-width:380px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.auth-box h1{font-size:1.25rem;text-align:center;margin-bottom:6px}
.auth-box p.sub{text-align:center;color:var(--muted);font-size:.88rem;margin-bottom:24px}
.auth-box button{width:100%;background:var(--accent);color:#fff;border:none;
  border-radius:8px;padding:11px;font-size:.95rem;font-weight:600}
.auth-box button:hover{background:#3d7aee}
.auth-err{color:#ff7b72;font-size:.83rem;min-height:18px;margin-top:10px;text-align:center}

/* dashboard layout */
#app{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar);background:var(--panel);border-right:1px solid var(--border);
  display:flex;flex-direction:column;position:fixed;top:0;bottom:0;left:0;z-index:80}
.sb-head{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.05rem;
  padding:18px;border-bottom:1px solid var(--border);color:var(--text)}
.sb-nav{flex:1;overflow-y:auto;padding:12px 10px}
.sb-group{font-size:.68rem;color:var(--muted);text-transform:uppercase;letter-spacing:.8px;
  padding:12px 10px 6px}
.sb-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;
  color:var(--muted);font-size:.9rem;cursor:pointer;transition:.12s;border:none;
  background:none;width:100%;text-align:left}
.sb-item:hover{background:var(--panel2);color:var(--text)}
.sb-item.active{background:var(--accent);color:#fff}
.sb-item .ico{width:18px;text-align:center}
.sb-foot{border-top:1px solid var(--border);padding:12px 14px;font-size:.82rem}
.sb-user{display:flex;align-items:center;gap:9px;margin-bottom:10px}
.avatar{width:30px;height:30px;border-radius:50%;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  display:grid;place-items:center;color:#0d1117;font-weight:700;font-size:.85rem}
.logout{width:100%;background:var(--panel2);border:1px solid var(--border);color:var(--text);
  border-radius:7px;padding:7px;font-size:.82rem}
.logout:hover{background:#252b33}
.main{margin-left:var(--sidebar);flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;gap:14px;padding:16px 26px;
  border-bottom:1px solid var(--border);background:rgba(13,17,23,.7);
  backdrop-filter:blur(8px);position:sticky;top:0;z-index:10}
.topbar h1{font-size:1.15rem;font-weight:700}
.topbar .crumb{color:var(--muted);font-size:.85rem}
.content{padding:28px 26px 60px;flex:1;max-width:1000px;width:100%}
.panel-view{display:none;animation:fade .18s ease}
.panel-view.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.view-head{margin-bottom:22px}
.view-head h2{font-size:1.5rem;display:flex;align-items:center;gap:10px}
.view-head h2 .tag{font-family:var(--mono);font-size:.68rem;color:var(--muted);
  font-weight:400;background:var(--panel2);padding:3px 8px;border-radius:6px}
.view-head p{color:var(--muted);font-size:.92rem;margin-top:6px;max-width:640px}
.out{margin-top:12px;background:var(--bg);border:1px solid var(--border);border-radius:8px;
  padding:11px 13px;font-family:var(--mono);font-size:.82rem;color:var(--accent2);
  word-break:break-all;min-height:40px;white-space:pre-wrap}
.out.empty{color:var(--muted);font-style:italic}
.spin{display:inline-block;width:12px;height:12px;border:2px solid var(--muted);
  border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite;
  vertical-align:middle;margin-right:6px}
@keyframes spin{to{transform:rotate(360deg)}}

.menu-btn{display:none;background:var(--panel2);border:1px solid var(--border);
  color:var(--text);border-radius:8px;padding:6px 11px;font-size:1rem}
@media(max-width:820px){
  :root{--sidebar:0px}
  .sidebar{transform:translateX(-100%);transition:.2s;width:240px}
  .sidebar.open{transform:none}
  .main{margin-left:0}
  .menu-btn{display:inline-block}
  .sb-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:70;display:none}
  .sb-backdrop.show{display:block}
}