:root {
  --bg-dark: #05090c;
  --panel-bg: rgba(10,25,35,.75);
  --accent: #00e5ff;
  --accent-red: #ff3b3b;
  --text-main: #e6f1f5;
  --muted: #8aa3ad;
  --radius: 18px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Exo 2", sans-serif;
  color: var(--text-main);
  background:
    /* linear-gradient(rgba(0,0,0,.65), rgba(0,0,0,.9)), */
    url("../assets/fish.jpg") center / cover no-repeat fixed;
}

/* HEADER */
header {
  padding: 24px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  gap: 12px;
}

.cfe { font-size: 48px; font-weight: 800; color: #eaffff; }
.robotics { font-size: 48px; font-weight: 800; color: var(--accent-red); }
.tagline { color:white; font-size: 21px; }

.header-right {
  display: flex;
  align-items: center;
  gap: 18px;
}

/* WS STATUS */
.ws-status { display: flex; align-items: center; gap: 10px; }
.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #888;
}

.dot.online{
  background: #2ecc71; /*green*/
}

.dot.connected { background: #00ff8c; }
.dot.error { background: #ff3b3b; }

/* LOGIN */
.login { position: relative; }
.login button {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 8px 14px;
  border-radius: 10px;
  cursor: pointer;
}
.login-box {
  position: absolute;
  right: 0;
  top: 44px;
  width: 220px;
  background: rgba(5,15,20,.95);
  padding: 14px;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.login-box input {
  background: #0b1a22;
  border: none;
  color: white;
  padding: 8px;
  border-radius: 8px;
}
.hidden { display: none; }

/* MAIN */
main {
  padding: 24px 32px;
  display: grid;
  grid-template-columns: 3fr 1.2fr;
  gap: 24px;
}

@media (max-width: 1000px) {
  main { grid-template-columns: 1fr; }
}

.sensor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px,1fr));
  gap: 20px;
}

.card {
  background: var(--panel-bg);
  padding: 20px;
  border-radius: var(--radius);
}

.label {
  color: smokegray ;
  text-transform: uppercase;
  font-size: 20px;
}

.value {
  margin-top: 14px;
  font-size: 48px;
  color: var(--accent);
 
  .unit{
       color: white;
       font-size:25px;
       }
}

.card {
  cursor: pointer;
}

.card:hover {
  transform: translateY(-4px) scale(1.01);
}

/* ===== CHART MODAL ===== */
/* ==============================
   CHART MODAL (REQUIRED)
============================== */

.chart-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);

  display: flex;
  align-items: center;
  justify-content: center;

  z-index: 1000;
}

.chart-modal.hidden {
  display: none;
}

/* chart container */
.chart-box {
  width: 92%;
  max-width: 760px;
  height: 420px;

  background: rgba(20, 25, 40, 0.9);
  border-radius: 18px;

  padding: 18px 20px 20px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.7);

  display: flex;
  flex-direction: column;
}

/* header row */
.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;

  margin-bottom: 10px;
}

/* chart title */
#chartTitle {
  font-size: 1.2rem;
  font-weight: 600;
  color: #ffffff;
}

/* close button */
#chartClose {
  background: none;
  border: none;

  color: #ffffff;
  font-size: 1.4rem;
  cursor: pointer;

  opacity: 0.8;
}

#chartClose:hover {
  opacity: 1;
}

/* canvas must expand properly */
#sensorChart {
  flex: 1;
  width: 100% !important;
  height: 100% !important;
}