/* RS485 Lab — rs485.niche123.net */
:root{
  --brand:#22b8ac;
  --brand-2:#3ecec1;
  --brand-dark:#189a90;
  --brand-soft:#e0f5f3;
  --bg:#edf3f4;
  --card:#ffffff;
  --ink:#22333f;
  --muted:#7f97a0;
  --line:#e2ebec;
  --danger:#e5484d;
  --danger-soft:#fdecec;
  --warn:#e8a13c;
  --ok:#22b8ac;
  --radius:18px;
  --shadow:0 10px 30px rgba(31,59,58,.08);
  --mono:'Cascadia Code','Consolas',monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:'Segoe UI',system-ui,-apple-system,sans-serif;
  background:var(--bg);color:var(--ink);font-size:14px;
}
.hidden{display:none !important}
button{font:inherit;cursor:pointer}
input,select{
  font:inherit;color:var(--ink);
  background:#fff;border:1px solid var(--line);border-radius:10px;
  padding:9px 12px;width:100%;outline:none;
  transition:border-color .15s, box-shadow .15s;
}
input:focus,select:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(34,184,172,.15)}
label{font-size:12px;color:var(--muted);font-weight:600;letter-spacing:.02em}

/* ---------- Login ---------- */
#login-screen{
  min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:22px;
  background:
    radial-gradient(700px 400px at 15% 10%, rgba(62,206,193,.25), transparent 60%),
    radial-gradient(700px 500px at 90% 90%, rgba(34,184,172,.2), transparent 60%),
    var(--bg);
  padding:24px;
}
.login-card{
  width:100%;max-width:380px;background:var(--card);border-radius:24px;box-shadow:var(--shadow);
  padding:36px 32px 30px;text-align:center;
}
.login-logo{display:flex;justify-content:center;margin-bottom:14px}
.login-card h1{font-size:24px;letter-spacing:.02em}
.login-sub{color:var(--muted);font-size:12.5px;margin:6px 0 24px}
#login-form{display:flex;flex-direction:column;gap:7px;text-align:left}
#login-form label{margin-top:8px}
.login-err{
  background:var(--danger-soft);color:var(--danger);border-radius:10px;
  padding:9px 12px;font-size:12.5px;margin-top:10px;
}
.login-foot{color:var(--muted);font-size:12.5px;max-width:420px;text-align:center;line-height:1.5}

/* ---------- Buttons ---------- */
.btn{
  border:none;border-radius:12px;padding:10px 18px;font-weight:600;letter-spacing:.03em;
  transition:transform .06s, box-shadow .15s, background .15s;
}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-primary{background:linear-gradient(135deg,var(--brand-2),var(--brand));color:#fff;box-shadow:0 6px 16px rgba(34,184,172,.35)}
.btn-primary:hover:not(:disabled){box-shadow:0 8px 20px rgba(34,184,172,.5)}
.btn-teal{background:var(--brand-soft);color:var(--brand-dark)}
.btn-teal:hover:not(:disabled){background:#d2efec}
.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}
.btn-ghost:hover:not(:disabled){color:var(--ink);border-color:#c9d8d9}
.btn-block{width:100%;margin-top:16px;padding:12px}
.btn-mini{padding:5px 12px;font-size:12px;border-radius:9px;background:var(--bg);color:var(--muted);border:1px solid var(--line)}
.btn-mini:hover{color:var(--ink)}
.btn-mini.on{background:var(--brand-soft);color:var(--brand-dark);border-color:transparent}
.btn-row{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
.btn-row.tight{margin-top:0}
.btn-row.center{justify-content:center}

/* ---------- App layout ---------- */
#app{display:flex;min-height:100vh}
#sidebar{
  width:230px;flex-shrink:0;background:var(--card);box-shadow:var(--shadow);
  display:flex;flex-direction:column;padding:22px 16px;position:sticky;top:0;height:100vh;
}
.side-logo{display:flex;align-items:center;gap:11px;padding:0 8px 22px}
.side-logo b{display:block;font-size:16px}
.side-logo span{display:block;font-size:11px;color:var(--muted)}
#sidebar nav{display:flex;flex-direction:column;gap:6px}
.nav-btn{
  display:flex;align-items:center;gap:12px;padding:12px 14px;border:none;border-radius:13px;
  background:transparent;color:var(--muted);font-weight:600;font-size:14px;text-align:left;
  transition:background .15s,color .15s;
}
.nav-btn svg{width:20px;height:20px;flex-shrink:0}
.nav-btn:hover{background:var(--bg);color:var(--ink)}
.nav-btn.active{background:linear-gradient(135deg,var(--brand-2),var(--brand));color:#fff;box-shadow:0 6px 14px rgba(34,184,172,.35)}
.side-foot{margin-top:auto;display:flex;flex-direction:column;gap:4px;padding-top:16px;border-top:1px solid var(--line)}
.side-user{font-size:11.5px;color:var(--muted);padding:4px 8px;word-break:break-all}
.side-link{background:none;border:none;color:var(--muted);text-align:left;padding:6px 8px;border-radius:8px;font-size:12.5px}
.side-link:hover{background:var(--bg);color:var(--ink)}
.side-link.danger:hover{color:var(--danger);background:var(--danger-soft)}

#main{flex:1;padding:22px 26px 40px;min-width:0}
.banner{
  background:#fff6e8;color:#9a6a1e;border:1px solid #f3ddb4;border-radius:12px;
  padding:11px 16px;margin-bottom:16px;font-size:13px;line-height:1.5;
}
#topbar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px;flex-wrap:wrap}
#topbar h2{font-size:22px}
.pills{display:flex;gap:8px}
.pill{
  display:flex;align-items:center;gap:7px;border:none;border-radius:99px;padding:7px 14px;
  font-size:11.5px;font-weight:700;letter-spacing:.05em;
  background:#e7eeee;color:var(--muted);
}
.pill .dot{width:8px;height:8px;border-radius:50%;background:#b7c6c8}
.pill.on{background:var(--brand-soft);color:var(--brand-dark)}
.pill.on .dot{background:var(--ok);box-shadow:0 0 0 3px rgba(34,184,172,.2)}

/* ---------- Cards ---------- */
.page{display:flex;flex-direction:column;gap:18px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 22px}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.card-head h3{font-size:15px;letter-spacing:.01em}
.status{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--muted);font-weight:600}
.dot{width:9px;height:9px;border-radius:50%;display:inline-block}
.dot.gray{background:#b7c6c8}
.dot.green{background:var(--ok);box-shadow:0 0 0 3px rgba(34,184,172,.18)}
.dot.red{background:var(--danger)}

.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:11px 14px}
.fld{display:flex;flex-direction:column;gap:5px}
.fld.span2{grid-column:span 2}
.fld.chk label{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--ink);font-weight:500;cursor:pointer}
.fld.chk input{width:auto}

.chips{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.chip{background:var(--bg);border-radius:99px;padding:5px 12px;font-size:11.5px;color:var(--muted);font-weight:600}
.chip b{color:var(--ink);margin-left:4px}
.chip.warn b{color:var(--warn)}
.inline-lbl{display:flex;align-items:center;gap:6px;font-size:11.5px}
.mini-input{width:64px;padding:5px 8px;border-radius:8px;font-size:12.5px}
.mini-select{width:auto;padding:5px 8px;border-radius:8px;font-size:12.5px}

/* ---------- Register grid ---------- */
.empty{color:var(--muted);font-size:13px;padding:14px 0}
.reg-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:8px;
  margin-bottom:14px;
}
.reg-cell{
  background:var(--bg);border-radius:12px;padding:8px 10px;text-align:center;
  border:1px solid transparent;
}
.reg-cell .a{font-size:10.5px;color:var(--muted);font-weight:700;letter-spacing:.03em}
.reg-cell .v{font-size:14.5px;font-weight:700;font-family:var(--mono);margin-top:2px;word-break:break-all}
.reg-cell input{
  width:100%;text-align:center;font-family:var(--mono);font-size:13.5px;font-weight:700;
  padding:4px 4px;margin-top:3px;border-radius:8px;
}
.reg-cell.flash{animation:flash .9s ease-out}
@keyframes flash{
  0%{background:var(--brand);border-color:var(--brand);color:#fff}
  100%{background:var(--bg)}
}
.reg-cell .p{font-size:10px;color:#7aa6a1;font-weight:700;font-family:var(--mono);margin-top:3px;letter-spacing:.04em}
.reg-cell.bit .v{font-size:11px;letter-spacing:.06em}
.reg-cell .v.on{color:var(--brand-dark)}
.reg-cell .v.off{color:#a9bcc0}

/* toggle for slave bits */
.tgl{position:relative;display:inline-block;width:40px;height:22px;margin-top:5px;cursor:pointer}
.tgl input{position:absolute;opacity:0;width:0;height:0}
.tgl i{
  position:absolute;inset:0;background:#cfdcde;border-radius:99px;transition:background .15s;
}
.tgl i::after{
  content:'';position:absolute;left:3px;top:3px;width:16px;height:16px;border-radius:50%;
  background:#fff;transition:left .15s;box-shadow:0 1px 3px rgba(0,0,0,.25);
}
.tgl input:checked + i{background:var(--brand)}
.tgl input:checked + i::after{left:21px}

/* ---------- Tabs ---------- */
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:14px;flex-wrap:wrap}
.tab{
  background:none;border:none;padding:9px 14px;font-size:12.5px;font-weight:600;color:var(--muted);
  border-bottom:2.5px solid transparent;margin-bottom:-1px;
}
.tab:hover{color:var(--ink)}
.tab.active{color:var(--brand-dark);border-bottom-color:var(--brand)}

/* ---------- Console ---------- */
.console{
  background:#0e2124;border-radius:13px;padding:12px 14px;height:260px;overflow-y:auto;
  font-family:var(--mono);font-size:12px;line-height:1.7;
}
.log-line{display:flex;gap:10px;align-items:baseline;white-space:nowrap}
.log-line .t{color:#5b7d82;flex-shrink:0}
.log-line .dir{font-weight:700;flex-shrink:0;width:30px}
.log-line.tx .dir{color:#3ecec1}
.log-line.rx .dir{color:#7fb2ff}
.log-line.err .dir{color:#ff7b81}
.log-line.sys .dir{color:#c8a24d}
.log-line .hex{color:#d7e6e4;word-break:break-all;white-space:normal}
.log-line .info{color:#7f97a0;white-space:normal}
.log-line.err .hex,.log-line.err .info{color:#ff9ba0}

/* ---------- Chart ---------- */
#m-chart{width:100%;border-radius:12px;background:var(--bg);display:none}

/* ---------- Last request ---------- */
.last-req label{display:block;margin-bottom:6px}
.last-req-box{
  background:var(--bg);border-radius:12px;padding:12px 14px;font-family:var(--mono);
  font-size:12.5px;min-height:44px;word-break:break-all;color:var(--ink);
}

/* ---------- Modal ---------- */
#modal-overlay,#pw-overlay{
  position:fixed;inset:0;background:rgba(20,40,42,.45);backdrop-filter:blur(2px);
  display:flex;align-items:center;justify-content:center;z-index:100;padding:20px;
}
.modal{
  background:#fff;border-radius:20px;padding:28px 30px;max-width:420px;width:100%;
  box-shadow:0 24px 60px rgba(0,0,0,.25);text-align:center;
}
.modal h3{font-size:17px;margin-bottom:10px}
.modal p{color:var(--muted);font-size:13.5px;line-height:1.6}
.modal-icon{
  width:52px;height:52px;border-radius:50%;background:var(--danger-soft);color:var(--danger);
  font-size:26px;font-weight:800;display:flex;align-items:center;justify-content:center;margin:0 auto 14px;
}
#pw-form{display:flex;flex-direction:column;gap:11px;text-align:left;margin-top:14px}
.fineprint{font-size:11px;color:var(--muted);margin-top:14px}

/* ---------- Toast ---------- */
#toast-root{position:fixed;right:18px;bottom:18px;display:flex;flex-direction:column;gap:8px;z-index:200}
.toast{
  background:#16302f;color:#e6f4f2;border-radius:12px;padding:11px 16px;font-size:13px;
  box-shadow:0 10px 24px rgba(0,0,0,.3);animation:toast-in .2s ease-out;max-width:340px;
}
.toast.err{background:#3a1518;color:#ffd7d9}
.toast.ok{background:#123c38;color:#c9f2ee}
@keyframes toast-in{from{transform:translateY(8px);opacity:0}to{transform:none;opacity:1}}

/* ---------- Responsive ---------- */
@media (max-width: 1000px){
  .grid2{grid-template-columns:1fr}
}
@media (max-width: 760px){
  #app{flex-direction:column}
  #sidebar{width:100%;height:auto;position:static;flex-direction:row;align-items:center;padding:10px 14px;gap:8px}
  .side-logo{padding:0;margin-right:6px}
  .side-logo div{display:none}
  #sidebar nav{flex-direction:row;flex:1}
  .nav-btn{padding:9px 13px}
  .side-foot{margin:0;padding:0;border:none;flex-direction:row}
  .side-user{display:none}
  #main{padding:16px 14px 30px}
  .form-grid{grid-template-columns:1fr 1fr}
}