:root{
  --bg:#f4f7fb;
  --bg-soft:#fbfdff;
  --card:#ffffff;
  --card-2:#f8fbff;
  --line:#e4ebf4;
  --line-strong:#d7e1ee;
  --text:#1f2f46;
  --text-soft:#334760;
  --muted:#6c7a90;
  --primary:#4d73ff;
  --primary-strong:#3e62ea;
  --primary-soft:#eef3ff;
  --danger:#d94b55;
  --danger-soft:#fff1f2;
  --ok:#1f9d67;
  --ok-soft:#e8f8f0;
  --warn:#c58d16;
  --warn-soft:#fff8e7;
  --shadow-sm:0 6px 18px rgba(31,47,70,.06);
  --shadow:0 16px 40px rgba(31,47,70,.08);
  --shadow-lg:0 22px 56px rgba(31,47,70,.12);
  --radius-xs:12px;
  --radius-sm:16px;
  --radius:22px;
  --radius-lg:28px;
  --content-width:1680px;
}

*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Segoe UI", Inter, Arial, sans-serif;
  color:var(--text);
  background:
    radial-gradient(900px 500px at -10% -10%, rgba(77,115,255,.10), transparent 60%),
    radial-gradient(700px 420px at 110% 0%, rgba(31,157,103,.08), transparent 52%),
    linear-gradient(180deg, #f7faff 0%, #f1f5fb 55%, #eef3f8 100%);
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background:
    linear-gradient(180deg, rgba(255,255,255,.55), rgba(255,255,255,0) 180px),
    radial-gradient(circle at 20% 12%, rgba(255,255,255,.85), transparent 26%),
    radial-gradient(circle at 80% 0%, rgba(255,255,255,.55), transparent 20%);
}

button,input,select,textarea{font:inherit}
a{color:inherit}
button{
  cursor:pointer;
  border:0;
  border-radius:14px;
  padding:12px 16px;
  background:linear-gradient(180deg, var(--primary) 0%, var(--primary-strong) 100%);
  color:#fff;
  font-weight:700;
  letter-spacing:.01em;
  box-shadow:0 10px 22px rgba(77,115,255,.20);
  transition:transform .16s ease, box-shadow .16s ease, filter .16s ease, background .16s ease;
}
button:hover{transform:translateY(-1px);box-shadow:0 14px 26px rgba(77,115,255,.24)}
button:active{transform:translateY(0)}
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible{
  outline:none;
  box-shadow:0 0 0 4px rgba(77,115,255,.14);
}
button.secondary{
  background:#fff;
  color:var(--text);
  border:1px solid var(--line);
  box-shadow:var(--shadow-sm);
}
button.secondary:hover{background:var(--bg-soft);border-color:var(--line-strong)}
button.danger{
  background:linear-gradient(180deg, #ea6171 0%, var(--danger) 100%);
  color:#fff;
  box-shadow:0 10px 22px rgba(217,75,85,.18);
}
button:disabled{opacity:.62;cursor:not-allowed;transform:none;box-shadow:none}

input,select,textarea{
  width:100%;
  padding:13px 14px;
  border:1px solid #d7e2ef;
  border-radius:14px;
  background:linear-gradient(180deg,#fff 0%, #fbfdff 100%);
  color:var(--text);
  outline:none;
  transition:border-color .15s ease, box-shadow .15s ease, background .15s ease, transform .15s ease;
}
input:hover,select:hover,textarea:hover{border-color:#c8d6e7}
input:focus,select:focus,textarea:focus{border-color:#9eb4ff;background:#fff}
input::placeholder,textarea::placeholder{color:#97a3b6}
select{appearance:none;background-image:linear-gradient(45deg, transparent 50%, #7b8da8 50%),linear-gradient(135deg, #7b8da8 50%, transparent 50%);background-position:calc(100% - 19px) calc(50% - 3px),calc(100% - 13px) calc(50% - 3px);background-size:6px 6px,6px 6px;background-repeat:no-repeat;padding-right:34px}
label{display:block;font-size:13px;color:var(--muted);margin:12px 0 8px;font-weight:700;letter-spacing:.01em}
textarea{resize:vertical;min-height:110px}

.card,
.panel,
.modal-card,
.login-card{
  position:relative;
  background:rgba(255,255,255,.92);
  border:1px solid rgba(228,235,244,.92);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  backdrop-filter:blur(12px);
}
.card::after,
.panel::after,
.login-card::after,
.modal-card::after{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  pointer-events:none;
  background:linear-gradient(180deg, rgba(255,255,255,.45), rgba(255,255,255,0) 28%);
}

/* login */
.login-body{
  display:flex;
  min-height:100vh;
  align-items:center;
  justify-content:center;
  padding:28px;
}
.login-card{
  width:100%;
  max-width:430px;
  padding:30px 28px 26px;
  border-radius:32px;
  box-shadow:var(--shadow-lg);
}
.login-mark{margin:0 auto 10px}
.login-card h1{margin:0 0 8px;text-align:center;font-size:32px;letter-spacing:-.02em}
.sub{color:var(--muted);text-align:center;margin:0 0 22px;line-height:1.5}
#login-form{display:flex;flex-direction:column;gap:8px}
#login-form label{margin:8px 0 4px}
#login-form button{width:100%;margin-top:10px;min-height:50px}
.error{color:var(--danger);font-size:14px;margin-top:2px;min-height:20px;font-weight:600}

/* app shell */
.shell{
  display:grid;
  grid-template-columns:292px minmax(0,1fr);
  min-height:100vh;
  position:relative;
  z-index:1;
}
.sidebar{
  position:sticky;
  top:0;
  height:100vh;
  padding:22px 16px 18px;
  border-right:1px solid rgba(228,235,244,.88);
  background:rgba(255,255,255,.78);
  backdrop-filter:blur(16px);
  display:flex;
  flex-direction:column;
  gap:18px;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  padding:8px 10px 16px;
  border-bottom:1px solid rgba(228,235,244,.78);
}
.brand-mark,
.login-mark{
  width:46px;
  height:46px;
  border-radius:16px;
  background:linear-gradient(180deg,#f5f8ff 0%, #eaf0ff 100%);
  border:1px solid #dbe5ff;
  display:grid;
  place-items:center;
  font-size:0;
  color:transparent;
  flex:0 0 auto;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.9), 0 8px 20px rgba(77,115,255,.10);
  position:relative;
  overflow:hidden;
}
.brand-mark::before,
.brand-mark::after,
.login-mark::before,
.login-mark::after{content:"";position:absolute;display:block}
.brand-mark::before,
.login-mark::before{
  width:20px;height:16px;bottom:11px;left:50%;transform:translateX(-50%);
  border:2px solid #5478ff;border-radius:4px;background:linear-gradient(180deg,#ffffff 0%, #eef4ff 100%);
  box-shadow:0 1px 0 rgba(255,255,255,.85) inset;
}
.brand-mark::after,
.login-mark::after{
  width:12px;height:20px;bottom:11px;left:50%;transform:translateX(-50%);
  border:2px solid #5478ff;border-bottom:none;border-radius:4px 4px 0 0;background:#f7faff;
}
.brand-title{font-size:23px;font-weight:800;line-height:1.05;letter-spacing:-.02em}
.brand-sub{font-size:13px;color:var(--muted);margin-top:4px;line-height:1.35}
.nav-list{display:flex;flex-direction:column;gap:8px}
.nav-btn{
  display:flex;
  align-items:center;
  gap:12px;
  width:100%;
  text-align:left;
  background:rgba(255,255,255,.82);
  color:var(--text);
  border:1px solid transparent;
  padding:13px 14px;
  border-radius:16px;
  min-height:50px;
  white-space:normal;
  line-height:1.2;
  box-shadow:none;
}
.nav-btn:hover{background:#fff;border-color:var(--line);box-shadow:var(--shadow-sm)}
.nav-btn .nav-ico{
  width:22px;
  height:22px;
  border-radius:8px;
  display:block;
  position:relative;
  background:linear-gradient(180deg,#f6f9ff 0%, #edf3ff 100%);
  border:1px solid #d9e4f5;
  flex:0 0 22px;
}
.nav-btn .nav-ico::before,
.nav-btn .nav-ico::after{content:"";position:absolute;display:block;box-sizing:border-box}
.nav-btn.active{
  background:linear-gradient(180deg,#f6f9ff 0%, #eef4ff 100%);
  color:var(--primary-strong);
  border-color:#dbe5ff;
  box-shadow:0 10px 22px rgba(77,115,255,.10);
}
.nav-btn.active .nav-ico{background:linear-gradient(180deg,#edf3ff 0%, #e1ebff 100%);border-color:#cad8ff}

.nav-ico-dashboard::before{left:4px;right:4px;bottom:4px;top:4px;background:linear-gradient(90deg,#5f7fff 0 3px,transparent 3px 6px,#5f7fff 6px 9px,transparent 9px 12px,#5f7fff 12px 15px);border-radius:4px;opacity:.95}
.nav-ico-dashboard::after{left:4px;right:4px;top:4px;height:3px;background:#5f7fff;border-radius:999px}
.nav-ico-controllers::before{inset:5px;border:2px solid #5f7fff;border-radius:5px}
.nav-ico-controllers::after{width:4px;height:4px;border-radius:50%;background:#5f7fff;left:50%;top:50%;transform:translate(-50%,-50%);box-shadow:-8px 0 0 #5f7fff,8px 0 0 #5f7fff,0 -8px 0 #5f7fff,0 8px 0 #5f7fff}
.nav-ico-sensors::before{width:8px;height:13px;border:2px solid #5f7fff;border-radius:999px;left:50%;top:3px;transform:translateX(-50%);background:#fff}
.nav-ico-sensors::after{width:10px;height:10px;border-radius:50%;background:#5f7fff;left:50%;bottom:3px;transform:translateX(-50%);box-shadow:0 -5px 0 -3px #5f7fff}
.nav-ico-settings::before{inset:4px;border:2px solid #5f7fff;border-radius:50%}
.nav-ico-settings::after{width:4px;height:4px;border-radius:50%;background:#5f7fff;left:50%;top:50%;transform:translate(-50%,-50%);box-shadow:0 -9px 0 #5f7fff,0 9px 0 #5f7fff,9px 0 0 #5f7fff,-9px 0 0 #5f7fff,6px 6px 0 #5f7fff,-6px 6px 0 #5f7fff,6px -6px 0 #5f7fff,-6px -6px 0 #5f7fff}
.nav-ico-logout::before{left:4px;top:5px;bottom:5px;width:7px;border:2px solid #cc5a65;border-right:none;border-radius:4px 0 0 4px}
.nav-ico-logout::after{right:4px;top:50%;width:9px;height:9px;border-top:2px solid #cc5a65;border-right:2px solid #cc5a65;transform:translateY(-50%) rotate(45deg)}

.logout-btn{margin-top:auto}
.content{
  padding:28px;
  min-width:0;
  width:100%;
  max-width:none;
}
.tab{display:none}
.tab.active{display:block}
.page-head{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:16px;
  margin-bottom:20px;
  flex-wrap:wrap;
}
.page-head h1{margin:0 0 7px;font-size:34px;letter-spacing:-.025em}
.page-head p{margin:0;color:var(--muted);line-height:1.5;max-width:760px}

/* dashboard */
.dashboard-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:18px;margin-bottom:20px}
.controller-card{padding:18px 18px 10px}
.controller-card .head{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  margin-bottom:8px;
  padding-bottom:4px;
  flex-wrap:wrap;
}
.controller-card .head strong{font-size:18px;letter-spacing:-.01em}
.sensor-row{
  padding:16px 0;
  border-top:1px solid rgba(228,235,244,.86);
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:12px;
  align-items:center;
}
.sensor-row:first-of-type{border-top:0}
.sensor-meta{font-size:13px;color:var(--muted);word-break:break-word;line-height:1.45}
.badge{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:92px;
  padding:6px 11px;
  border-radius:999px;
  font-size:12px;
  font-weight:800;
  letter-spacing:.02em;
  border:1px solid transparent;
}
.badge.ok{background:var(--ok-soft);color:var(--ok);border-color:#c8eddc}
.badge.alert{background:var(--danger-soft);color:var(--danger);border-color:#ffd4d8}
.badge.offline{background:#f3f6fa;color:#667085;border-color:#e0e7ef}
.value{font-size:28px;font-weight:800;line-height:1.05;margin:10px 0 12px;letter-spacing:-.03em;color:var(--text-soft)}
.split{display:grid;grid-template-columns:minmax(360px,480px) minmax(0,1fr);gap:20px;align-items:start}
.form-card,.chart-card,.list-card{padding:22px}
.form-card h3,.list-card h3,.chart-head h3{margin:0;font-size:20px;letter-spacing:-.015em}
.form-card.wide{max-width:none}
.card-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.form-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.check{
  display:flex;
  gap:10px;
  align-items:center;
  margin-top:16px;
  color:var(--text);
  font-weight:700;
  padding:10px 12px;
  border:1px solid var(--line);
  border-radius:14px;
  background:linear-gradient(180deg,#fff 0%, var(--bg-soft) 100%);
}
.check input{width:auto;accent-color:var(--primary)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.list-item{
  padding:16px;
  border:1px solid var(--line);
  border-radius:18px;
  margin-bottom:12px;
  background:linear-gradient(180deg,#fff 0%, var(--card-2) 100%);
  box-shadow:0 8px 18px rgba(31,47,70,.04);
  overflow:hidden;
}
.list-item strong{word-break:break-word;font-size:16px}
.item-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.chart-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap;margin-bottom:14px}
.chart-tools{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.chart-wrap{position:relative;height:360px;min-height:360px;width:100%;border-radius:18px;background:linear-gradient(180deg,#fff 0%, #fbfdff 100%);border:1px solid var(--line);padding:10px}
.chart-wrap canvas{width:100% !important;height:100% !important;display:block}
.notify-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(310px,1fr));gap:16px}
.notify-box{
  padding:18px;
  border:1px solid var(--line);
  border-radius:18px;
  background:linear-gradient(180deg,#fff 0%, var(--bg-soft) 100%);
  min-width:0;
  box-shadow:0 8px 18px rgba(31,47,70,.04);
}
.notify-box h4{margin:0 0 10px;font-size:18px;letter-spacing:-.01em}
.hint{margin-top:10px;font-size:12px;color:var(--muted);line-height:1.55}
.empty{
  padding:18px;
  border:1px dashed #d5deea;
  border-radius:18px;
  color:var(--muted);
  background:rgba(255,255,255,.76);
}

/* legacy index page support */
.topbar{
  position:sticky;
  top:0;
  z-index:5;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  padding:20px 24px;
  background:rgba(255,255,255,.78);
  backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(228,235,244,.9);
}
.topbar h1{margin:0 0 6px;font-size:30px;letter-spacing:-.03em}
.topbar p{margin:0;color:var(--muted)}
.topbar-actions{display:flex;gap:10px;flex-wrap:wrap}
.container{width:min(100%, var(--content-width));margin:0 auto;padding:24px}
.panel{padding:22px;margin-bottom:18px}
.section-header{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.section-header h2{margin:0;font-size:24px;letter-spacing:-.02em}
.controller-grid,.sensor-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:14px}
.chart-panel .chart-wrap{height:380px;min-height:380px}
.error-box{margin-top:14px;padding:12px 14px;border-radius:14px;background:var(--danger-soft);color:var(--danger);border:1px solid #ffd6da}
.hidden{display:none !important}
.modal{
  position:fixed;
  inset:0;
  z-index:20;
  display:grid;
  place-items:center;
  padding:24px;
  background:rgba(26,39,58,.24);
  backdrop-filter:blur(8px);
}
.modal-card{
  width:min(100%, 720px);
  padding:22px;
  border-radius:28px;
  box-shadow:var(--shadow-lg);
}
.modal-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:10px}
.modal-head h3{margin:0;font-size:22px;letter-spacing:-.02em}
.modal-head button{min-width:44px;padding:10px 12px}

@media (max-width: 1280px){
  .content,.container{width:100%;max-width:none}
}
@media (max-width: 1180px){
  .shell{grid-template-columns:1fr}
  .sidebar{
    position:relative;
    top:auto;
    height:auto;
    border-right:none;
    border-bottom:1px solid rgba(228,235,244,.88);
  }
  .logout-btn{margin-top:10px}
}
@media (max-width: 900px){
  .split{grid-template-columns:1fr}
  .chart-wrap{height:320px;min-height:320px}
  .page-head h1{font-size:30px}
}
@media (max-width: 640px){
  .login-body,.modal{padding:16px}
  .content,.container{padding:16px}
  .page-head h1,.topbar h1{font-size:26px}
  .nav-btn{padding:12px}
  .grid2{grid-template-columns:1fr}
  .chart-wrap,.chart-panel .chart-wrap{height:270px;min-height:270px}
  .form-actions,.topbar,.section-header{align-items:stretch}
  .topbar{padding:16px;flex-direction:column}
}