/* =====================================================================
   Sensor Dashboard (PHP) – style.css
   ===================================================================== */

:root {
  --c-bg:        #eef2f7;
  --c-surface:   #ffffff;
  --c-surface2:  #f7f9fc;
  --c-border:    #dde3ed;
  --c-primary:   #2563eb;
  --c-primary-d: #1d4ed8;
  --c-success:   #16a34a;
  --c-danger:    #dc2626;
  --c-warning:   #d97706;
  --c-text:      #1e293b;
  --c-muted:     #64748b;

  --shadow:      0 1px 4px rgba(0,0,0,.09), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg:   0 4px 20px rgba(0,0,0,.11);
  --radius:      8px;
  --radius-lg:   12px;
  --t:           .14s ease;
}

/* ── Reset ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
}

/* ── HEADER ─────────────────────────────────────────────────────────── */
header {
  background: linear-gradient(135deg, #0f2d6b 0%, #1e4fd8 100%);
  color: #fff;
  padding: 0 28px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 200;
  gap: 16px;
}
.header-left  { display: flex; align-items: center; gap: 12px; }
.header-logo  { font-size: 1.5rem; line-height: 1; }
.header-title { font-size: 1.15rem; font-weight: 700; letter-spacing: -.3px; }
.header-title span { opacity: .65; font-weight: 400; font-size: .88rem; }

#server-time {
  font-size: .82rem;
  background: rgba(255,255,255,.13);
  border: 1px solid rgba(255,255,255,.2);
  padding: 5px 14px;
  border-radius: 20px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ── LAYOUT ─────────────────────────────────────────────────────────── */
main {
  max-width: 1700px;
  margin: 0 auto;
  padding: 22px 22px 50px;
}

/* ── CARD ────────────────────────────────────────────────────────────── */
.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  margin-bottom: 18px;
  overflow: hidden;
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--c-border);
  background: var(--c-surface2);
}
.card-header h2 { font-size: .92rem; font-weight: 600; }
.card-body { padding: 16px 20px; }

/* ── FILTERS ─────────────────────────────────────────────────────────── */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-end;
}
.filter-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.filter-group > label {
  font-size: .72rem;
  font-weight: 700;
  color: var(--c-muted);
  text-transform: uppercase;
  letter-spacing: .5px;
}
.filter-group input[type="datetime-local"],
.filter-group select {
  padding: 7px 10px;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-size: .85rem;
  background: #fff;
  color: var(--c-text);
  transition: border-color var(--t);
}
.filter-group input:focus,
.filter-group select:focus {
  outline: 2px solid var(--c-primary);
  outline-offset: 1px;
  border-color: transparent;
}
.filter-actions { display: flex; gap: 8px; align-items: flex-end; }

.row-count-badge {
  font-size: .78rem;
  color: var(--c-muted);
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  padding: 3px 10px;
  border-radius: 12px;
}

/* ── BUTTONS ─────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-size: .84rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t);
  white-space: nowrap;
  line-height: 1.4;
  text-decoration: none;
}
.btn-primary  { background: var(--c-primary);  color: #fff; }
.btn-primary:hover  { background: var(--c-primary-d); }
.btn-outline  { background: #fff; border-color: var(--c-border); color: var(--c-text); }
.btn-outline:hover  { background: var(--c-bg); }
.btn-success  { background: var(--c-success);  color: #fff; }
.btn-success:hover  { filter: brightness(.9); }
.btn-danger   { background: var(--c-danger);   color: #fff; }
.btn-danger:hover   { filter: brightness(.9); }
.btn-sm { padding: 4px 10px; font-size: .78rem; }
.col-toggle-actions { display: flex; gap: 6px; }

/* ── TABS ────────────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: -1px;
  position: relative;
  z-index: 1;
}
.tab-btn {
  padding: 10px 22px;
  border: 1px solid var(--c-border);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  background: var(--c-surface2);
  cursor: pointer;
  font-size: .88rem;
  font-weight: 600;
  color: var(--c-muted);
  transition: all var(--t);
}
.tab-btn:hover:not(.active) { background: #fff; color: var(--c-text); }
.tab-btn.active { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── COLUMN TOGGLES ──────────────────────────────────────────────────── */
.col-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.col-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 11px;
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: 20px;
  cursor: pointer;
  font-size: .78rem;
  user-select: none;
  transition: all var(--t);
}
.col-toggle:hover          { border-color: var(--c-primary); background: #eff6ff; }
.col-toggle.active         { background: #dbeafe; border-color: var(--c-primary); color: var(--c-primary); font-weight: 600; }
.col-toggle input[type="checkbox"] { accent-color: var(--c-primary); width: 13px; height: 13px; cursor: pointer; }

/* ── TABLE ───────────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

table#data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .8rem;
}
#data-table thead th {
  position: sticky;
  top: 58px;
  background: #1e3a8a;
  color: #fff;
  padding: 10px 13px;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  border-right: 1px solid rgba(255,255,255,.1);
  transition: background var(--t);
}
#data-table thead th:hover      { background: #1d4ed8; }
#data-table thead th:last-child { border-right: none; }

.th-inner    { display: flex; align-items: center; gap: 5px; }
.sort-icon   { opacity: .38; font-size: .68rem; }
th.sort-asc  .sort-icon { opacity: 1; color: #93c5fd; }
th.sort-desc .sort-icon { opacity: 1; color: #93c5fd; }
th.sort-asc  .sort-icon::after { content: "▲"; }
th.sort-desc .sort-icon::after { content: "▼"; }
th:not(.sort-asc):not(.sort-desc) .sort-icon::after { content: "↕"; }

#data-table tbody tr {
  border-bottom: 1px solid #f1f5f9;
  transition: background var(--t);
}
#data-table tbody tr:nth-child(even)  { background: #f8fafc; }
#data-table tbody tr:hover            { background: #e0f2fe !important; }
#data-table td { padding: 8px 13px; white-space: nowrap; }

td.col-id  { color: var(--c-muted); font-size: .75rem; text-align: right; }
td.col-ts  { font-family: 'Courier New', monospace; font-size: .78rem; color: #334155; }
td.col-neg { color: #94a3b8; font-style: italic; }

/* Kolorowanie pH */
td.ph-ok   { color: #16a34a; font-weight: 600; }
td.ph-warn { color: #d97706; font-weight: 600; }
td.ph-bad  { color: #dc2626; font-weight: 600; }

/* ── PAGINATION ─────────────────────────────────────────────────────── */
.pagination-bar {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  border-top: 1px solid var(--c-border);
  background: var(--c-surface2);
  min-height: 52px;
}
#pagination {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
  width: 100%;
}
.pagination-info { color: var(--c-muted); font-size: .8rem; margin-right: auto; }
.page-btn {
  min-width: 32px;
  height: 32px;
  padding: 0 9px;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  font-size: .8rem;
  font-weight: 600;
  transition: all var(--t);
}
.page-btn:hover:not(:disabled):not(.active) {
  background: var(--c-primary); color: #fff; border-color: var(--c-primary);
}
.page-btn.active   { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }
.page-btn:disabled { opacity: .35; cursor: default; }

/* ── CHARTS ─────────────────────────────────────────────────────────── */
.chart-group { margin-bottom: 6px; }
.chart-canvas-wrap { position: relative; height: 260px; }
.ds-toggles { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.ds-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border-radius: 20px;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: .8rem;
  font-weight: 600;
  transition: all var(--t);
  user-select: none;
}
.ds-btn.active { color: #fff; }
.ds-btn:not(.active) {
  background: var(--c-surface2) !important;
  border-color: var(--c-border) !important;
  color: var(--c-muted);
}

/* ── STATUS BAR ─────────────────────────────────────────────────────── */
#status-bar {
  position: fixed;
  bottom: 20px;
  right: 22px;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: .82rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  display: none;
  z-index: 1000;
  max-width: 380px;
}
#status-bar.show  { display: flex; align-items: center; gap: 8px; }
#status-bar.ok    { background: var(--c-success); color: #fff; }
#status-bar.error { background: var(--c-danger);  color: #fff; }
#status-bar.info  { background: var(--c-primary); color: #fff; }

/* ── SPINNER ─────────────────────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 16px; height: 16px;
  border: 2.5px solid rgba(0,0,0,.12);
  border-top-color: var(--c-primary);
  border-radius: 50%;
  animation: spin .65s linear infinite;
  flex-shrink: 0;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── EMPTY STATE ─────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--c-muted);
}
.empty-icon { font-size: 2.4rem; margin-bottom: 12px; }
.empty-state p { font-size: .88rem; }

/* ── RESPONSIVE ─────────────────────────────────────────────────────── */
@media (max-width: 680px) {
  header { height: auto; padding: 12px 14px; flex-direction: column; align-items: flex-start; }
  main   { padding: 14px 10px 40px; }
  .filters { flex-direction: column; }
  .filter-actions { flex-wrap: wrap; }
  #data-table thead th { top: 0; }
}