:root {
  --ink: #153e49;
  --muted: #61777e;
  --bg: #edf4f5;
  --paper: #fff;
  --accent: #176c7e;
  --line: #d5e3e7;
  --warm: #9a4b38;
  font-family:
    -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-synthesis: none;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
header,
main,
footer {
  max-width: 1100px;
  margin: auto;
}
header {
  padding: 25px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
a {
  color: var(--accent);
  text-underline-offset: 4px;
}
.brand {
  text-decoration: none;
  font-size: 24px;
  font-weight: 650;
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  background: var(--ink);
  color: white;
  border-radius: 12px;
  padding: 3px 10px;
  font-size: 28px;
}
.brand-note {
  font-size: 12px;
  font-weight: 400;
  border-left: 1px solid var(--line);
  padding-left: 12px;
  color: var(--muted);
}
header > a:last-child {
  font-size: 13px;
}
main {
  padding: 35px 28px 0;
}
.intro {
  margin: 8px 0 36px;
}
.eyebrow {
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--accent);
}
h1 {
  font-family: "Songti SC", "Noto Serif CJK SC", serif;
  font-size: clamp(30px, 4.3vw, 48px);
  line-height: 1.35;
  font-weight: 500;
  letter-spacing: 2px;
  margin: 20px 0 12px;
}
.intro > p:not(.eyebrow) {
  color: var(--muted);
  font-size: 15px;
}
.status-line {
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
}
.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #9a8152;
}
.workspace {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 22px;
  align-items: start;
}
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 25px;
}
.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.card-top h2 {
  margin: 0;
}
.tag {
  font-size: 12px;
  padding: 5px 10px;
  background: var(--bg);
  border-radius: 20px;
}
.control {
  text-align: center;
  padding: 26px 30px;
}
.control .card-top {
  text-align: left;
  font-size: 14px;
}
.water-visual {
  width: 154px;
  height: 154px;
  margin: 30px auto 20px;
  background: #e8f3f5;
  border-radius: 50%;
  display: grid;
  place-items: center;
}
.water-visual svg {
  width: 125px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.running .drops {
  animation: flow 1s infinite alternate;
}
@keyframes flow {
  to {
    transform: translateY(4px);
    opacity: 0.45;
  }
}
h2 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 15px;
}
.muted {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}
.meter {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 28px 0;
  border-block: 1px solid var(--line);
  padding: 22px 0;
}
.meter div + div {
  border-left: 1px solid var(--line);
}
.meter span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 9px;
}
.meter strong {
  font-size: 21px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}
.notice {
  background: #edf5f6;
  border-radius: 10px;
  padding: 12px 15px;
  text-align: left;
  font-size: 13px;
  line-height: 1.7;
  margin: 12px 0;
  overflow-wrap: anywhere;
}
.notice.error {
  background: #fff0e9;
  color: #8d3e29;
}
.notice:empty {
  display: none;
}
.actions {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}
button {
  font: inherit;
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 17px;
  background: white;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s;
}
button:hover:not(:disabled) {
  background: #e8f2f4;
}
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}
button.primary:hover:not(:disabled) {
  background: #13596a;
}
.actions button {
  font-size: 16px;
  padding: 15px;
}
button.stop {
  color: var(--warm);
  border-color: #d9b9ad;
}
button:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}
.secondary-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 12px;
}
.secondary-actions button {
  border: 0;
  font-size: 12px;
  padding: 8px 0;
  text-decoration: underline;
  text-underline-offset: 4px;
}
.small {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.85;
  text-align: left;
}
.control > .small {
  margin-top: 20px;
}
.side {
  display: grid;
  gap: 20px;
}
label {
  display: block;
  font-size: 13px;
  margin: 16px 0 10px;
}
input,
select {
  width: 100%;
  display: block;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fcfefe;
  font: inherit;
  font-size: 16px;
  color: var(--ink);
  margin-top: 8px;
}
input:focus,
select:focus,
button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid #80b8c5;
  outline-offset: 3px;
}
.form-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}
.form-actions button {
  flex: 1;
}
#device-form .form-actions {
  flex-wrap: wrap;
}
#device-form .form-actions button {
  flex: 1 0 85px;
}
.check {
  display: flex;
  align-items: start;
  gap: 10px;
  font-size: 12px;
  line-height: 1.7;
}
.check input {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  margin: 2px 0;
}
.full {
  width: 100%;
  margin-top: 5px;
}
.account-data {
  margin-top: 22px;
}
.balance {
  font-family: ui-monospace, monospace;
  font-size: 30px;
  margin: 22px 0;
}
.balance span {
  display: block;
  font-family: inherit;
  color: var(--muted);
  font-size: 12px;
  margin-top: 8px;
}
.month-label {
  max-width: 220px;
}
.bill {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
}
.bill small {
  display: block;
  color: var(--muted);
  margin-top: 7px;
}
.bill strong {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
details {
  margin-top: 20px;
}
summary {
  cursor: pointer;
  font-size: 14px;
}
#logs {
  padding-left: 20px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.9;
  overflow-wrap: anywhere;
}
footer {
  display: flex;
  justify-content: space-between;
  padding: 30px 28px;
  font-size: 12px;
  color: var(--muted);
}
video {
  max-width: 100%;
  margin-top: 15px;
  border-radius: 10px;
}
[hidden] {
  display: none !important;
}
@media (max-width: 720px) {
  header {
    padding: 18px 20px;
  }
  .brand-note {
    display: none;
  }
  main {
    padding: 20px 16px 0;
  }
  .intro {
    margin: 12px 5px 26px;
  }
  h1 {
    font-size: 32px;
  }
  .workspace {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .card {
    padding: 22px;
  }
  .water-visual {
    margin: 20px auto;
  }
  .side {
    gap: 16px;
  }
  .intro .eyebrow {
    letter-spacing: 0.5px;
    font-size: 11px;
  }
  .meter {
    margin: 20px 0;
  }
  .account-data {
    margin-top: 16px;
  }
  footer {
    gap: 15px;
    padding: 25px 20px;
  }
  .control {
    grid-row: 2;
  }
  .brand {
    font-size: 21px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}