:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --bg-elevated: #1c2230;
  --border: #2d333b;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #3fb9a6;
  --accent-soft: rgba(63, 185, 166, .15);
  --danger: #f85149;
  --warn: #d29922;
  --radius: 14px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  min-height: 100vh;
  padding-bottom: calc(24px + var(--safe-bottom));
}

.hidden { display: none !important; }
.muted { color: var(--text-muted); }

/* ------------------------------------------------------------- top bar */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: calc(10px + var(--safe-top)) 16px 10px;
  background: rgba(13, 17, 23, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.logo { width: 28px; height: 28px; color: var(--accent); flex: none; }
.brand-text { min-width: 0; }
.brand-text h1 { margin: 0; font-size: 16px; font-weight: 650; letter-spacing: .2px; }
.status-line {
  margin: 0;
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 55vw;
}
.status-line.ok::before,
.status-line.err::before {
  content: "";
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: 1px;
  background: var(--accent);
}
.status-line.err::before { background: var(--danger); }

.actions { display: flex; gap: 6px; flex: none; }

.icon-btn {
  display: grid;
  place-items: center;
  width: 42px; height: 42px;
  border: none;
  border-radius: 12px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}
.icon-btn:active { background: var(--bg-elevated); }
.icon-btn svg { width: 22px; height: 22px; }
.icon-btn.spinning svg { animation: spin .8s linear infinite; }

@keyframes spin { to { transform: rotate(360deg); } }

/* -------------------------------------------------------------- layout */

main { padding: 16px; max-width: 640px; margin: 0 auto; }

.section-title {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin: 22px 4px 10px;
}

.empty {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.6;
  margin: 48px 16px;
}

/* ------------------------------------------------------------- devices */

.device-list { display: flex; flex-direction: column; gap: 10px; }

.device-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.device-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  flex: none;
}
.device-dot.on { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.device-card h3 { margin: 0; font-size: 15px; font-weight: 600; }
.device-card p { margin: 2px 0 0; font-size: 12px; color: var(--text-muted); }
.device-meta { margin-left: auto; text-align: right; font-size: 12px; color: var(--text-muted); }
.device-card > div:not(.device-meta) { min-width: 0; }
.device-card h3 { overflow-wrap: anywhere; }
.device-edit { flex: none; width: 36px; height: 36px; margin-right: -8px; }
.device-edit svg { width: 18px; height: 18px; }

/* ------------------------------------------------------------- sensors */

.sensor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
}

.sensor-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  text-align: left;
  color: inherit;
  font: inherit;
  transition: border-color .15s;
}
.sensor-card:active { border-color: var(--accent); }

.sensor-head { display: flex; align-items: center; gap: 8px; }
.sensor-icon {
  display: grid;
  place-items: center;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  flex: none;
}
.sensor-icon svg { width: 16px; height: 16px; }
.sensor-name {
  font-size: 12px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sensor-value { font-size: 22px; font-weight: 650; letter-spacing: -.3px; }
.sensor-value .unit { font-size: 12px; font-weight: 500; color: var(--text-muted); margin-left: 3px; }
.sensor-spark { width: 100%; height: 34px; display: block; }
.sensor-time { font-size: 11px; color: var(--text-muted); }

/* --------------------------------------------------------------- detail */

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: none;
  background: none;
  color: var(--accent);
  font: inherit;
  font-size: 15px;
  padding: 6px 8px 6px 0;
  cursor: pointer;
}
.back-btn svg { width: 22px; height: 22px; }

.detail-head { display: flex; align-items: center; gap: 12px; margin-top: 8px; }
.detail-head .sensor-icon { width: 40px; height: 40px; border-radius: 12px; }
.detail-head .sensor-icon svg { width: 22px; height: 22px; }
.detail-head h2 { margin: 0; font-size: 18px; }
.detail-head p { margin: 2px 0 0; font-size: 13px; }
.detail-head > div { min-width: 0; }
.detail-calibrate { margin-left: auto; flex: none; }

.detail-value { margin: 18px 2px 14px; font-size: 44px; font-weight: 700; letter-spacing: -1px; }
.detail-value .unit { font-size: 18px; font-weight: 500; color: var(--text-muted); margin-left: 6px; }

.range-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  overflow-x: auto;
}
.range-tabs button {
  flex: 1;
  min-width: 56px;
  padding: 9px 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  color: var(--text-muted);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}
.range-tabs button.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.chart-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 8px 8px;
  min-height: 220px;
}
.chart-box svg { width: 100%; height: auto; display: block; }

/* Hover / touch read-out on charts */
.chart-box, .sensor-spark-slot { position: relative; }
.chart-guide { stroke: var(--text-muted); stroke-width: 1; stroke-dasharray: 3 3; visibility: hidden; }
.chart-guide.visible { visibility: visible; }
.chart-dot {
  position: absolute;
  width: 9px; height: 9px;
  margin: -4.5px 0 0 -4.5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 2px var(--bg-card);
  pointer-events: none;
}
.chart-tip {
  position: absolute;
  z-index: 2;
  padding: 4px 8px;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 12px;
  white-space: nowrap;
  pointer-events: none;
}
.chart-empty {
  display: grid;
  place-items: center;
  min-height: 196px;
  color: var(--text-muted);
  font-size: 13px;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 12px;
}
.stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 6px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
}
.stat-label { display: block; font-size: 11px; font-weight: 500; color: var(--text-muted); margin-bottom: 3px; }

/* ------------------------------------------------------------ settings */

dialog {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg-card);
  color: var(--text);
  padding: 20px;
  width: min(92vw, 360px);
}
dialog::backdrop { background: rgba(0, 0, 0, .55); }
dialog h2 { margin: 0 0 16px; font-size: 17px; }
dialog label { display: block; font-size: 13px; color: var(--text-muted); margin: 12px 0 6px; }
dialog input, dialog select {
  width: 100%;
  padding: 11px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 15px;
}
dialog .hint { font-size: 12px; color: var(--text-muted); margin: 6px 0 0; }
dialog code { background: var(--bg-elevated); padding: 1px 5px; border-radius: 5px; }

.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px; }
.dialog-actions button {
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--accent);
  color: #04231f;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.dialog-actions button.secondary { background: transparent; color: var(--text); }

/* --------------------------------------------------------------- toast */

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(20px + var(--safe-bottom));
  transform: translateX(-50%);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  z-index: 50;
  max-width: 90vw;
  text-align: center;
}
.toast.err { border-color: var(--danger); color: var(--danger); }

/* ------------------------------------------------------------- section */

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}
.section-head .section-title { margin-top: 22px; }

.text-btn {
  border: none;
  background: none;
  color: var(--accent);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  padding: 6px 0;
  margin-top: 16px;
}

main.faded { display: none; }

/* ---------------------------------------------------------- login page */

.login-screen {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
}

.login-card {
  width: min(100%, 360px);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.login-logo { width: 56px; height: 56px; color: var(--accent); }
.login-card h1 { margin: 0; font-size: 22px; }
.login-sub { margin: 0; font-size: 14px; color: var(--text-muted); line-height: 1.5; }

.google-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 13px 18px;
  margin-top: 6px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  color: #1f1f1f;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.google-btn:active { background: #f1f1f1; }
.google-btn svg { width: 20px; height: 20px; }

.hint-err { color: var(--danger); }

/* ----------------------------------------------------------- user chip */

.user-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  padding: 4px 10px 4px 4px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  max-width: 40vw;
}
.user-pic {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg);
}
.user-name {
  font-size: 12px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ------------------------------------------------------ device dialog */

.dialog-subtitle {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
  margin: 18px 0 8px;
}

.dev-list { display: flex; flex-direction: column; gap: 6px; }

.dev-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.dev-info { display: flex; align-items: center; gap: 8px; min-width: 0; }
.dev-name {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.dev-type { font-size: 11px; color: var(--text-muted); }

.small-btn {
  flex: none;
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}
.small-btn.danger { background: transparent; color: var(--danger); border-color: rgba(248, 81, 73, .4); }

.primary-btn {
  flex: none;
  padding: 11px 16px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #04231f;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.row { display: flex; gap: 8px; }
.row input { flex: 1; min-width: 0; }

.device-edit { flex: none; width: 36px; height: 36px; margin-right: -8px; }
.device-edit svg { width: 18px; height: 18px; }

/* ------------------------------------------------------------- roles */

body:not(.is-admin) .admin-only { display: none !important; }

/* ------------------------------------------------------ first-run setup */

#setup-screen { overflow-y: auto; place-items: start center; }
.setup-card { width: min(100%, 440px); margin: 24px auto; }
.setup-step {
  width: 100%;
  text-align: left;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.setup-step h2 { margin: 0 0 6px; font-size: 15px; }
.setup-step p { margin: 6px 0; font-size: 13px; line-height: 1.5; color: var(--text-muted); }
.setup-step label { display: block; font-size: 13px; color: var(--text-muted); margin: 12px 0 6px; }
.setup-step input {
  width: 100%;
  padding: 11px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 15px;
}
.setup-step .hint { font-size: 12px; }
.setup-path {
  display: block;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--bg-elevated);
  font-size: 12px;
  overflow-wrap: anywhere;
  user-select: all;
}
.setup-submit { width: 100%; }
.setup-submit:disabled { opacity: .6; cursor: progress; }

/* --------------------------------------------------------------- admin */

.admin-title { margin: 12px 2px 14px; font-size: 20px; }
.admin-tabs { margin: 0 0 14px; }
.admin-tab > .hint { font-size: 12px; color: var(--text-muted); margin: 0 2px 12px; line-height: 1.5; }
.admin-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 16px 16px;
}
.admin-panel h3 { margin: 14px 0 2px; font-size: 14px; }
.admin-panel label { display: block; font-size: 13px; color: var(--text-muted); margin: 12px 0 6px; }
.admin-panel input, .admin-panel select {
  width: 100%;
  padding: 11px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 15px;
}
.admin-panel .hint { font-size: 12px; color: var(--text-muted); margin: 8px 0 0; line-height: 1.5; }
.admin-panel code { background: var(--bg-elevated); padding: 1px 5px; border-radius: 5px; }
.panel-actions { display: flex; justify-content: flex-end; margin-top: 16px; }
.user-row .hint { font-size: 12px; color: var(--text-muted); margin: 8px 0 0; }
.user-row { flex-direction: column; align-items: stretch; }
.user-head { display: flex; align-items: center; gap: 10px; }
.user-head .dev-info { flex-direction: column; align-items: flex-start; gap: 0; flex: 1; }
.user-head .dev-name { font-weight: 600; }
.role-badge {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .4px;
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-left: 6px;
}
.role-badge.pending { background: rgba(210, 153, 34, .15); color: var(--warn); }
.device-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.device-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  cursor: pointer;
  user-select: none;
}
.device-chip input { width: auto; margin: 0; accent-color: var(--accent); }
.device-chip:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }