:root {
  color-scheme: light;
  --blue-900: #223142;
  --blue-800: #2b3e52;
  --blue-700: #314b63;
  --blue-600: #3e5f7a;
  --gray-100: #eef3f6;
  --gray-200: #d7e0e6;
  --gray-700: #516170;
  --white: #ffffff;
  --green: #2d9b75;
  --red: #c6514a;
  --shadow: 0 22px 55px rgba(13, 30, 45, 0.24);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--blue-900);
  color: var(--white);
}

button,
input {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  min-height: 100svh;
  overflow: hidden;
}

.view {
  min-height: 100vh;
  min-height: 100svh;
  padding: max(28px, env(safe-area-inset-top)) 22px max(26px, env(safe-area-inset-bottom));
}

.splash-view {
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 34px;
  background:
    radial-gradient(circle at 50% 18%, rgba(122, 166, 194, 0.28), transparent 30%),
    linear-gradient(160deg, #233449 0%, #405b70 52%, #7f919d 100%);
}

.brand-mark {
  position: relative;
  width: min(58vw, 220px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  filter: drop-shadow(0 22px 26px rgba(17, 34, 48, 0.28));
}

.gauge {
  position: relative;
  width: 100%;
  height: 100%;
  border: 14px solid rgba(255, 255, 255, 0.78);
  border-bottom-color: rgba(255, 255, 255, 0.26);
  border-radius: 50%;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.24), rgba(255, 255, 255, 0.06));
}

.gauge::after {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.4);
}

.gauge-needle {
  position: absolute;
  left: 50%;
  bottom: 49%;
  width: 5px;
  height: 34%;
  border-radius: 999px;
  background: #ecf7fb;
  transform: translateX(-50%) rotate(42deg);
  transform-origin: bottom center;
}

.gauge-hub {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #dcecf2;
  transform: translate(-50%, -50%);
}

.gauge-tick {
  position: absolute;
  top: 19%;
  left: 50%;
  width: 4px;
  height: 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  transform-origin: 50% 70px;
}

.tick-left {
  transform: translateX(-50%) rotate(-48deg);
}

.tick-mid {
  transform: translateX(-50%);
}

.tick-right {
  transform: translateX(-50%) rotate(48deg);
}

.water-drop {
  position: absolute;
  right: 6%;
  bottom: 1%;
  width: 30%;
  height: 30%;
  border-radius: 58% 58% 58% 8%;
  background: linear-gradient(145deg, #d5f4ff, #79b4cb);
  transform: rotate(-45deg);
  box-shadow: inset 10px 8px 18px rgba(255, 255, 255, 0.45);
}

.splash-copy {
  text-align: center;
}

.eyebrow {
  margin: 0 0 8px;
  color: rgba(255, 255, 255, 0.74);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(44px, 12vw, 70px);
  line-height: 1;
}

h2 {
  font-size: 28px;
  line-height: 1.15;
}

.status-line {
  min-height: 24px;
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 16px;
}

.settings-view,
.calibration-view,
.history-view {
  background: linear-gradient(180deg, #edf3f7 0%, #d7e2e8 100%);
  color: var(--blue-900);
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 680px;
  margin: 0 auto 24px;
}

.settings-view .eyebrow,
.calibration-view .eyebrow,
.history-view .eyebrow {
  color: var(--blue-600);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-text-button {
  min-height: 36px;
  padding: 0 12px;
  border-radius: 8px;
  background: rgba(49, 75, 99, 0.13);
  color: var(--blue-700);
  box-shadow: none;
  font-size: 13px;
}

.badge {
  flex: 0 0 auto;
  padding: 8px 11px;
  border-radius: 999px;
  background: rgba(81, 97, 112, 0.13);
  color: var(--gray-700);
  font-size: 13px;
  font-weight: 700;
}

.badge.connected {
  background: rgba(45, 155, 117, 0.14);
  color: var(--green);
}

.badge.error {
  background: rgba(198, 81, 74, 0.13);
  color: var(--red);
}

.settings-form,
.calibration-form {
  display: grid;
  gap: 15px;
  max-width: 680px;
  margin: 0 auto;
}

label {
  display: grid;
  gap: 8px;
  color: var(--blue-900);
  font-size: 14px;
  font-weight: 700;
}

input {
  width: 100%;
  min-height: 50px;
  border: 1px solid rgba(49, 75, 99, 0.22);
  border-radius: 8px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.86);
  color: var(--blue-900);
  outline: none;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.75);
}

input:focus {
  border-color: var(--blue-600);
  box-shadow: 0 0 0 4px rgba(62, 95, 122, 0.14);
}

.form-actions {
  display: grid;
  gap: 12px;
  margin-top: 8px;
}

button {
  min-height: 52px;
  border: 0;
  border-radius: 8px;
  background: var(--blue-700);
  color: var(--white);
  font-weight: 800;
  box-shadow: var(--shadow);
}

button:active {
  transform: translateY(1px);
}

.secondary-button {
  background: rgba(49, 75, 99, 0.13);
  color: var(--blue-700);
  box-shadow: none;
}

.scanner-panel {
  position: relative;
  max-width: 680px;
  aspect-ratio: 16 / 10;
  margin: 0 auto 18px;
  overflow: hidden;
  border: 1px solid rgba(49, 75, 99, 0.18);
  border-radius: 8px;
  background: linear-gradient(145deg, rgba(49, 75, 99, 0.14), rgba(255, 255, 255, 0.76));
}

.scanner-video,
.html5-qr-reader,
.scanner-placeholder {
  width: 100%;
  height: 100%;
}

.scanner-video {
  object-fit: cover;
  background: #101820;
}

.html5-qr-reader {
  background: #101820;
  color: var(--white);
}

.html5-qr-reader video {
  width: 100% !important;
  height: 100% !important;
  object-fit: cover;
}

.html5-qr-reader div,
.html5-qr-reader span {
  box-shadow: none !important;
}

.scanner-placeholder {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 14px;
  color: var(--gray-700);
}

.scanner-frame {
  width: min(48vw, 220px);
  aspect-ratio: 1;
  border: 3px solid rgba(49, 75, 99, 0.52);
  border-radius: 8px;
  box-shadow: inset 0 0 0 8px rgba(255, 255, 255, 0.42);
}

.history-panel {
  max-width: 860px;
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid rgba(49, 75, 99, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.7);
}

.history-table-head,
.history-row {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1.2fr;
  gap: 10px;
  align-items: center;
}

.history-table-head {
  padding: 12px 14px;
  background: rgba(49, 75, 99, 0.13);
  color: var(--blue-700);
  font-size: 13px;
  font-weight: 800;
}

.history-list {
  display: grid;
}

.history-row {
  padding: 13px 14px;
  border-top: 1px solid rgba(49, 75, 99, 0.12);
  color: var(--blue-900);
  font-size: 14px;
}

.history-row span {
  min-width: 0;
  overflow-wrap: anywhere;
}

.empty-history {
  padding: 28px 14px;
  color: var(--gray-700);
  text-align: center;
}

.form-message {
  max-width: 680px;
  min-height: 22px;
  margin: 16px auto 0;
  color: var(--gray-700);
  font-size: 14px;
}

.hidden,
.view.hidden {
  display: none;
}

@media (min-width: 720px) {
  .view {
    padding-left: 38px;
    padding-right: 38px;
  }

  .settings-form {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .settings-form label:nth-child(1),
  .settings-form label:nth-child(3),
  .settings-form label:nth-child(5),
  .settings-form label:nth-child(6),
  .settings-form .form-actions {
    grid-column: 1 / -1;
  }

  .settings-form label:nth-child(2) {
    grid-column: 1 / 2;
  }

  .settings-form label:nth-child(4) {
    grid-column: 1 / -1;
  }

  .calibration-form {
    grid-template-columns: 1fr 1fr;
  }

  .calibration-form .form-actions {
    grid-column: 1 / -1;
  }

  .form-actions {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .history-table-head {
    display: none;
  }

  .history-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .history-row span::before {
    display: block;
    color: var(--gray-700);
    font-size: 12px;
    font-weight: 800;
  }

  .history-row span:nth-child(1)::before {
    content: "SN";
  }

  .history-row span:nth-child(2)::before {
    content: "METERSUM";
  }

  .history-row span:nth-child(3)::before {
    content: "校准时间";
  }
}