:root {
  --bg: #eef5fb;
  --panel: #ffffff;
  --panel2: #f4f8fc;
  --line: #d8e4ef;
  --text: #0f2236;
  --muted: #546a80;
  --blue: #0b6bcb;
  --water: #3b9be6;
  --water2: #1d74c4;
  --green: #15803d;
  --amber: #b45309;
  --red: #c2281e;
  font-family: "IBM Plex Sans Thai", system-ui, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--text); font-size: 15px; line-height: 1.5; }
a { color: var(--blue); }
button { font: inherit; cursor: pointer; }
.mono { font-family: "JetBrains Mono", monospace; font-size: 12px; word-break: break-all; }

.top { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; padding: 18px 24px 8px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand h1 { margin: 0; font-size: 21px; }
.brand p { margin: 0; color: var(--muted); font-size: 13px; }
.conn { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.device { font-family: "JetBrains Mono", monospace; font-size: 13px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); background: var(--panel); }
.pill { display: inline-flex; align-items: center; gap: 8px; padding: 4px 12px; border-radius: 999px; background: var(--panel); border: 1px solid var(--line); font-size: 13px; }
.pill i { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.pill.online i { background: #16a34a; box-shadow: 0 0 8px #16a34a; }
.pill.offline i { background: var(--red); }
.pill.sim i { background: #f59e0b; }
.ago { color: var(--muted); font-size: 13px; }

.banner, .alertbar { margin: 8px 24px 0; padding: 12px 16px; border-radius: 12px; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; border: 1px solid var(--line); background: var(--panel); }
.banner.sim { border-color: #f5c27a; background: #fff8ec; }
.alertbar { border-color: #f3a39b; background: #fdecea; color: #7f1610; }
.banner b, .alertbar b { display: block; }
.banner span { color: var(--muted); font-size: 13px; }
.banner-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.primary { background: var(--blue); color: #fff; border: 0; border-radius: 9px; padding: 9px 14px; font-weight: 600; }
.primary:disabled { opacity: .45; cursor: default; }
.banner button:not(.primary), .alertbar button:not(.primary), .ghost { background: var(--panel); color: var(--text); border: 1px solid var(--line); border-radius: 9px; padding: 8px 12px; }
.valve { display: flex; align-items: center; gap: 6px; font-size: 14px; }

.grid { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 16px; padding: 16px 24px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 16px 18px; }
.panel h2 { margin: 0 0 6px; font-size: 13px; font-weight: 600; color: var(--muted); }
.tank-panel { grid-column: 1; }
.control { grid-column: 2; grid-row: 1 / span 2; }
.history { grid-column: 1; }
.side { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.tank-wrap { display: grid; grid-template-columns: 190px 1fr; gap: 24px; align-items: center; }
#tank { width: 100%; height: auto; display: block; }
.big { display: flex; align-items: baseline; gap: 4px; }
.big b { font: 700 56px "JetBrains Mono", monospace; letter-spacing: -2px; color: var(--water2); line-height: 1.05; }
.big small { color: var(--muted); font-size: 20px; }
.litres { margin: 2px 0 0; color: var(--muted); }
.litres b { color: var(--text); font-family: "JetBrains Mono", monospace; }
.pumpline { margin: 8px 0 0; font-weight: 600; }
.pumpline.on { color: var(--green); }
.pumpline.bad { color: var(--red); }
.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin: 14px 0 0; }
.stats div { background: var(--panel2); border: 1px solid var(--line); border-radius: 12px; padding: 8px 10px; }
.stats dt { font-size: 12px; color: var(--muted); }
.stats dd { margin: 0; font-size: 13px; }
.stats dd b { font: 700 20px "JetBrains Mono", monospace; }

.seg { display: grid; grid-template-columns: 1fr 1fr; background: var(--panel2); border: 1px solid var(--line); border-radius: 10px; padding: 3px; margin-top: 4px; }
.seg button { background: none; border: 0; color: var(--muted); padding: 7px; border-radius: 8px; font-weight: 600; }
.seg button.on { background: var(--blue); color: #fff; }
.switch { width: 100%; display: grid; grid-template-columns: 34px 1fr 46px; align-items: center; gap: 10px; text-align: left; background: var(--panel2); color: var(--text); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; margin-top: 12px; }
.switch .icon { font-size: 22px; }
.switch b { display: block; }
.switch em { font-style: normal; color: var(--muted); font-size: 13px; }
.switch .knob { width: 46px; height: 26px; border-radius: 999px; background: #b8c6d4; position: relative; transition: background .2s; }
.switch .knob:after { content: ""; position: absolute; top: 3px; left: 3px; width: 20px; height: 20px; border-radius: 50%; background: #fff; transition: transform .2s; }
.switch.on .knob { background: #16a34a; }
.switch.on .knob:after { transform: translateX(20px); }
.switch.fault .knob { background: var(--red); }
.switch:disabled, .seg button:disabled { cursor: default; }
.control.disabled .seg, .control.disabled .switch, .control.disabled input, .control.disabled .primary { opacity: .5; }
.hint { color: var(--muted); font-size: 12px; margin: 8px 0 0; min-height: 18px; }
.control h3 { font-size: 13px; color: var(--muted); font-weight: 600; margin: 18px 0 4px; }
.control label { display: block; margin-top: 10px; font-size: 14px; }
.control output { font-family: "JetBrains Mono", monospace; color: var(--blue); font-weight: 700; }
.control input[type=range] { width: 100%; accent-color: var(--blue); margin-top: 6px; }
.control .primary, .control .ghost { width: 100%; margin-top: 12px; }

.panel-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.legend { display: flex; gap: 12px; font-size: 12px; color: var(--muted); flex-wrap: wrap; }
.legend span:before { content: ""; display: inline-block; width: 12px; height: 3px; margin-right: 5px; vertical-align: middle; border-radius: 2px; }
.ll:before { background: var(--water2); }
.lp:before { background: #16a34a; height: 8px !important; opacity: .55; }
.lth:before { background: repeating-linear-gradient(90deg, var(--muted) 0 3px, transparent 3px 6px); }
#chart { width: 100%; height: 230px; display: block; margin-top: 6px; }

.log { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; font-size: 13px; }
.log li { display: flex; gap: 10px; }
.log time { font-family: "JetBrains Mono", monospace; color: var(--muted); font-size: 12px; min-width: 64px; }
.log .empty { color: var(--muted); }
.meta { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 0; font-size: 13px; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; }

.foot { padding: 0 24px 28px; color: var(--muted); font-size: 12px; }
.foot p { margin: 4px 0; }

@media (max-width: 960px) {
  .grid { grid-template-columns: 1fr; padding: 12px 16px; }
  .tank-panel, .control, .history, .side { grid-column: 1; grid-row: auto; }
  .side { grid-template-columns: 1fr; gap: 14px; }
  .top { padding: 14px 16px 4px; }
  .banner, .alertbar { margin: 8px 16px 0; }
  .foot { padding: 0 16px 24px; }
}
@media (max-width: 520px) {
  .tank-wrap { grid-template-columns: 124px 1fr; gap: 12px; }
  .big b { font-size: 42px; }
  .stats { grid-template-columns: 1fr; }
}

/* the water surface sways while the pump fills the tank */
.wave.on { animation: sway 2.4s ease-in-out infinite alternate; }
@keyframes sway { from { transform: translateX(-8px); } to { transform: translateX(8px); } }
@media (prefers-reduced-motion: reduce) { .wave.on { animation: none; } }