* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  margin: 0; background: #f5f5f7; color: #222;
}
.login-wrap {
  max-width: 360px; margin: 15vh auto; padding: 2rem; background: #fff; border-radius: 14px;
  box-shadow: 0 8px 24px rgba(0,0,0,.06); text-align: center;
}
.login-wrap h1 { margin: 0 0 1.2rem; font-weight: 700; letter-spacing: -.5px; }
.login-form { display: flex; flex-direction: column; gap: .75rem; }
.login-form label { text-align: left; font-size: .85rem; color: #555; }
.login-form input {
  width: 100%; padding: .6rem .7rem; border: 1px solid #ddd; border-radius: 8px;
  font-size: 1rem; margin-top: .25rem;
}
.login-form button {
  padding: .6rem 1rem; background: #0369a1; color: #fff; border: 0; border-radius: 8px;
  font-size: 1rem; cursor: pointer;
}
.err { background: #fee; color: #b00; padding: .5rem; border-radius: 6px; margin-bottom: 1rem; }

.top {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap;
  padding: .8rem 1rem; background: #fff; box-shadow: 0 1px 0 rgba(0,0,0,.05);
  position: sticky; top: 0; z-index: 10;
}
.who { display: flex; align-items: center; gap: .6rem; }
.logout { color: #888; font-size: .8rem; text-decoration: none; }

.card {
  max-width: 700px; margin: 1rem auto; background: #fff; border-radius: 12px;
  padding: 1rem 1.2rem; box-shadow: 0 1px 3px rgba(0,0,0,.05);
}
.card h2 { margin: 0 0 .7rem; font-size: 1rem; color: #333; }
.row { display: flex; flex-wrap: wrap; gap: .6rem; align-items: flex-end; }
.row label { display: flex; flex-direction: column; font-size: .8rem; color: #555; gap: .25rem; flex: 1 1 140px; }
.row input, .row select {
  padding: .55rem .7rem; border: 1px solid #ddd; border-radius: 8px; font-size: .95rem;
}
.row .cb { flex-direction: row; align-items: center; }
.row button {
  padding: .6rem 1.1rem; background: #0369a1; color: #fff; border: 0; border-radius: 8px;
  font-size: .95rem; cursor: pointer; height: fit-content;
}
.muted { color: #888; font-size: .85rem; margin-top: .6rem; }
.warn { background: #fee; color: #b00; padding: .5rem .7rem; border-radius: 8px; margin-bottom: .6rem; font-weight: 500; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: .75rem; }
.kpi { background: #f8fafc; border: 1px solid #eef2f7; border-radius: 10px; padding: .7rem .8rem; display: flex; flex-direction: column; gap: .4rem; }
.kpi-label { font-size: .75rem; color: #64748b; text-transform: uppercase; letter-spacing: .4px; }
.kpi-val { font-size: 1.2rem; font-weight: 600; }
.kpi-sub { font-size: .8rem; color: #64748b; }
.kpi form button { align-self: flex-start; padding: .4rem .7rem; font-size: .85rem; background: #059669; }

.pill { padding: .25rem .6rem; border-radius: 999px; font-size: .8rem; margin-left: .5rem; background: #dcfce7; color: #166534; border: 1px solid #86efac; }
.pill.on { background: #dcfce7; color: #166534; }
.pill.warn-pill { background: #fee; color: #b00; border-color: #b00; }

.chlor-picker { margin-top: .8rem; }
.chlor-picker-label { font-size: .8rem; color: #555; }
.swatch-row { display: flex; gap: .5rem; margin-top: .4rem; flex-wrap: wrap; }
.swatch { display: flex; flex-direction: column; align-items: center; gap: .3rem; cursor: pointer; }
.swatch input { position: absolute; opacity: 0; width: 0; height: 0; }
.swatch-color {
  width: 40px; height: 40px; border-radius: 8px; border: 2px solid #ddd; display: block;
  transition: border-color .15s, transform .1s;
}
.swatch input:checked + .swatch-color { border-color: #0369a1; transform: scale(1.08); box-shadow: 0 0 0 2px rgba(3,105,161,.25); }
.swatch-label { font-size: .75rem; color: #555; }
.save-btn { margin-top: .8rem; padding: .6rem 1.1rem; background: #0369a1; color: #fff; border: 0; border-radius: 8px; font-size: .95rem; cursor: pointer; }

.list { width: 100%; border-collapse: collapse; margin-top: .6rem; font-size: .85rem; }
.list th, .list td { padding: .35rem .4rem; text-align: left; border-bottom: 1px solid #eee; }
.list th { color: #888; font-weight: 500; font-size: .75rem; }

.flash-wrap { max-width: 700px; margin: .5rem auto 0; padding: 0 1rem; }
.flash { background: #e0f2fe; color: #0369a1; padding: .5rem .7rem; border-radius: 8px; margin-bottom: .3rem; }