:root{
  --bg:#0f1419; --panel:#1a2029; --line:#2b3542; --txt:#e6edf3; --muted:#8b98a5;
  --accent:#3b82f6; --ok:#22c55e; --warn:#f59e0b; --danger:#ef4444; --radius:10px;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  background:var(--bg);color:var(--txt);font-size:15px;line-height:1.5}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.muted{color:var(--muted)}
.center{text-align:center}

/* topbar */
.topbar{display:flex;justify-content:space-between;align-items:center;
  padding:14px 24px;background:var(--panel);border-bottom:1px solid var(--line)}
.brand{font-weight:700}
.brand span{color:var(--muted);font-weight:400;margin-left:6px}
.topbar nav a{margin-left:18px;color:var(--muted);font-weight:500}
.topbar nav a.active{color:var(--txt)}
.topbar nav a.logout{color:var(--danger)}

.wrap{max-width:1080px;margin:0 auto;padding:24px}

/* flash */
.flash{padding:11px 15px;border-radius:var(--radius);margin-bottom:16px;font-weight:500}
.flash.ok{background:rgba(34,197,94,.12);color:#86efac;border:1px solid rgba(34,197,94,.3)}
.flash.error{background:rgba(239,68,68,.12);color:#fca5a5;border:1px solid rgba(239,68,68,.3)}

/* login */
.login-card{max-width:360px;margin:8vh auto;background:var(--panel);
  padding:32px;border-radius:16px;border:1px solid var(--line);text-align:center}
.login-card h1{margin:0 0 4px}
.login-card form{margin-top:22px;text-align:left}
.login-card label{font-size:13px;color:var(--muted)}
.login-card input{width:100%;margin:6px 0 16px}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px;text-align:center}
.stat .num{display:block;font-size:28px;font-weight:700}
.stat .lbl{color:var(--muted);font-size:13px}
.stat.ok .num{color:var(--ok)}

/* mode banner */
.mode-banner{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:var(--radius);
  margin-bottom:18px;background:var(--panel);border:1px solid var(--line)}
.mode-banner.send{border-color:rgba(34,197,94,.4)}
.mode-banner.paused{border-color:rgba(245,158,11,.4)}
.mode-banner a{margin-left:auto;font-size:13px}

/* toolbar */
.toolbar{display:flex;gap:12px;justify-content:space-between;flex-wrap:wrap;margin-bottom:8px}
.toolbar form{display:flex;gap:8px;align-items:center}
.search input{width:260px}

input,select,button{font:inherit;padding:9px 12px;border-radius:8px;border:1px solid var(--line);
  background:var(--bg);color:var(--txt)}
input:focus,select:focus{outline:2px solid var(--accent);border-color:var(--accent)}
button{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600;cursor:pointer}
button:hover{filter:brightness(1.1)}
.upload button{background:transparent;color:var(--accent)}

/* table */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--radius)}
table.contacts{width:100%;border-collapse:collapse;background:var(--panel);
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-top:6px}
.contacts th,.contacts td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line)}
.contacts th{font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
.contacts tbody tr:hover{background:rgba(255,255,255,.02)}
.contacts tr:last-child td{border-bottom:none}
.badge{font-size:12px;padding:3px 9px;border-radius:20px;background:var(--line);color:var(--muted)}
.badge.ok{background:rgba(34,197,94,.15);color:#86efac}

/* pagination */
.pagination{display:flex;gap:16px;align-items:center;justify-content:center;margin:20px 0;color:var(--muted)}

/* settings */
.settings-form{max-width:560px;background:var(--panel);border:1px solid var(--line);
  border-radius:var(--radius);padding:24px;margin-top:12px}
.field{margin-bottom:22px}
.field>label{display:block;font-weight:600;margin-bottom:8px}
.field.two{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field input[type=number]{width:100%}
.radios label,.toggle-field label{display:block;font-weight:400;margin:6px 0}
.hint{color:var(--muted);font-size:13px;margin:6px 0 0}
.switch{display:flex;align-items:center;gap:10px;cursor:pointer}

@media(max-width:720px){
  .wrap{padding:16px}
  .topbar{flex-direction:column;align-items:flex-start;gap:10px;padding:12px 16px}
  .topbar nav{display:flex;gap:14px}
  .topbar nav a:first-child{margin-left:0}
  .stats{grid-template-columns:repeat(2,1fr);gap:10px}
  .stat .num{font-size:22px}
  .mode-banner{flex-wrap:wrap}
  .toolbar{flex-direction:column}
  .toolbar form{width:100%;flex-wrap:wrap}
  .search input{flex:1;min-width:0;width:auto}
  .search select,.search button{flex:0 0 auto}
  .upload{flex-wrap:wrap}
  .upload input[type=file]{flex:1;min-width:0}
  .settings-form,.field.two{grid-template-columns:1fr}
  .field.two{display:block}
  .field.two>div+div{margin-top:16px}
}