*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body { font-family: system-ui, sans-serif; background: #0f172a; color: #e2e8f0; min-height: 100vh; }

/* Header */
header { display: flex; justify-content: space-between; align-items: center;
  padding: 12px 24px; background: #1e293b; border-bottom: 1px solid #334155; }
header span { font-size: 1.2rem; font-weight: 700; color: #38bdf8; }
nav { display: flex; gap: 12px; align-items: center; }
nav a { color: #94a3b8; text-decoration: none; font-size: .9rem; }
nav a:hover { color: #e2e8f0; }

/* Buttons */
button { cursor: pointer; border: none; border-radius: 8px; font-size: .9rem; padding: 8px 16px;
  background: #334155; color: #e2e8f0; transition: background .15s; }
button:hover { background: #475569; }
#logoutBtn { background: #7f1d1d; color: #fca5a5; }
#logoutBtn:hover { background: #991b1b; }

/* Login */
.login-page { display: flex; align-items: center; justify-content: center; }
.login-box { background: #1e293b; border-radius: 12px; padding: 40px; width: 320px; display: flex; flex-direction: column; gap: 16px; }
.login-box h1 { text-align: center; color: #38bdf8; }
.login-box input { width: 100%; padding: 10px 14px; border-radius: 8px; border: 1px solid #334155;
  background: #0f172a; color: #e2e8f0; font-size: 1rem; }
.login-box button { width: 100%; background: #0284c7; color: white; padding: 12px; font-size: 1rem; }
.login-box button:hover { background: #0369a1; }
.error { color: #f87171; font-size: .85rem; text-align: center; }
.hidden { display: none !important; }

/* Main */
main { padding: 24px; display: flex; flex-wrap: wrap; gap: 20px; }

/* Device card */
.device-card { background: #1e293b; border-radius: 12px; padding: 20px; min-width: 300px; flex: 1 1 300px; }
.device-header { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.device-header h2 { font-size: 1.1rem; }
.location { font-size: .8rem; color: #94a3b8; }
.badge { font-size: .75rem; padding: 2px 8px; border-radius: 12px; margin-left: auto; }
.badge.online { background: #14532d; color: #86efac; }

/* Relay grid */
.relay-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 16px; }
.relay-btn { padding: 14px 8px; border-radius: 10px; font-size: .85rem; text-align: center; line-height: 1.4; }
.relay-btn.on  { background: #0369a1; color: #fff; box-shadow: 0 0 12px #0284c766; }
.relay-btn.off { background: #1e3a5f; color: #94a3b8; }
.relay-btn:hover { opacity: .85; }

/* Input LEDs */
.input-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.led { width: 14px; height: 14px; border-radius: 50%; display: inline-block; }
.led-on  { background: #4ade80; box-shadow: 0 0 8px #4ade80; }
.led-off { background: #374151; }
.led-label { font-size: .85rem; color: #94a3b8; margin-right: 12px; }