/* ============================================================
   SERVER MONITORING DASHBOARD — STYLESHEET
   Light theme, soft shadows, rounded corners, smooth transitions
   ============================================================ */

/* ---- CSS Variables ---- */
:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --border: #e4e8ef;
  --text-primary: #1a1d23;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;

  /* Brand / accent */
  --accent: #4f46e5;
  --accent-light: #ede9fe;

  /* Status colors */
  --up: #22c55e;
  --up-bg: #dcfce7;
  --up-dark: #16a34a;
  --down: #ef4444;
  --down-bg: #fee2e2;
  --down-dark: #b91c1c;
  --warn: #f59e0b;
  --warn-bg: #fef3c7;

  /* Card metric icon backgrounds */
  --icon-uptime: #ede9fe;
  --icon-uptime-fg: #7c3aed;
  --icon-downtime: #fee2e2;
  --icon-downtime-fg: #dc2626;
  --icon-incidents: #fef3c7;
  --icon-incidents-fg: #d97706;
  --icon-response: #dbeafe;
  --icon-response-fg: #2563eb;

  /* Dark chart background */
  --chart-dark-bg: #0f0f1a;
  --chart-dark-surface: #16162a;
  /* Response chart bg — adapts per theme */
  --chart-bg: #0f0f1a;
  --chart-grid: rgba(255,255,255,0.05);
  --chart-tick: #6b7280;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.10);

  /* Radii */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;

  /* Spacing */
  --gap: 20px;
  --container: 1280px;
}

/* ---- Dark Theme Variables ---- */
[data-theme="dark"] {
  --bg: #0f1117;
  --surface: #1a1d27;
  --border: #2a2d3a;
  --text-primary: #f0f2f8;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  /* Lighter accent for dark mode — original #4f46e5 is too dark to read */
  --accent: #6963e7;
  --accent-light: #2d2a5e;

  /* Icon backgrounds — darker tints */
  --icon-uptime: #2d2a5e;
  --icon-uptime-fg: #a78bfa;
  --icon-downtime: #3b1f1f;
  --icon-downtime-fg: #f87171;
  --icon-incidents: #3b2f0f;
  --icon-incidents-fg: #fbbf24;
  --icon-response: #1e2d4a;
  --icon-response-fg: #60a5fa;

  /* Shadows — deeper in dark mode */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.2);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);

  /* Status badge backgrounds */
  --up-bg: #14291f;
  --down-bg: #2d1515;
  --warn-bg: #2d2010;

  /* Response chart in dark mode stays dark */
  --chart-bg: #0c0e16;
  --chart-grid: rgba(255,255,255,0.06);
  --chart-tick: #6b7280;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  /* Smooth theme transition */
  transition: background 0.3s ease, color 0.3s ease;
}
img, svg { display: block; }
button { cursor: pointer; font: inherit; }
select, input { font: inherit; }

/* ---- Utility ---- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.hidden { display: none !important; }

/* Global smooth theme transition for surfaces */
.header, .card, .filter-bar, .filter-control, .incidents-table th,
.incidents-table td, .footer, .loading-overlay, .table-wrapper {
  transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}


/* ============================================================
   LOADING OVERLAY
   ============================================================ */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(244, 246, 249, 0.85);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 9999;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: opacity 0.3s ease;
}
.loading-overlay.fade-out { opacity: 0; pointer-events: none; }
[data-theme="dark"] .loading-overlay {
    background: rgba(184, 186, 189, 0.45);
}

.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   HEADER
   ============================================================ */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
  gap: 16px;
}
.header-left { display: flex; align-items: center; gap: 14px; }
.header-title { font-size: 1.2rem; font-weight: 700; color: var(--text-primary); letter-spacing: -0.02em; }
.header-subtitle { font-size: 0.8rem; color: var(--text-secondary); margin-top: 1px; }

.status-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--up);
  box-shadow: 0 0 0 3px var(--up-bg);
  flex-shrink: 0;
  transition: background 0.3s, box-shadow 0.3s;
}
.status-dot.down { background: var(--down); box-shadow: 0 0 0 3px var(--down-bg); }

.header-right { display: flex; align-items: center; gap: 16px; }

.live-badge {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--up-dark);
  background: var(--up-bg);
  padding: 3px 10px;
  border-radius: 99px;
  animation: pulse-badge 2s ease-in-out infinite;
}
@keyframes pulse-badge {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.live-clock {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

/* ---- Theme Toggle Button ---- */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text-secondary);
  transition: background 0.2s, border-color 0.2s, color 0.2s, transform 0.15s, box-shadow 0.2s;
  flex-shrink: 0;
}
.theme-toggle:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
.theme-toggle:active { transform: scale(0.9); }

.theme-toggle svg {
  width: 17px;
  height: 17px;
  transition: opacity 0.2s, transform 0.3s;
  position: absolute;
}
.theme-toggle { position: relative; }

/* Light mode: show moon, hide sun */
.icon-sun  { opacity: 0; transform: rotate(90deg) scale(0.6); }
.icon-moon { opacity: 1; transform: rotate(0deg) scale(1); }

/* Dark mode: show sun, hide moon */
[data-theme="dark"] .icon-sun  { opacity: 1; transform: rotate(0deg) scale(1); }
[data-theme="dark"] .icon-moon { opacity: 0; transform: rotate(-90deg) scale(0.6); }

/* ============================================================
   MAIN
   ============================================================ */
.main { padding: 28px 24px; display: flex; flex-direction: column; gap: 24px; }

/* ============================================================
   FILTER BAR
   ============================================================ */
.filter-bar {
  display: flex;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}
.filter-group { display: flex; flex-direction: column; gap: 5px; }
.filter-label { font-size: 0.72rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.06em; }
.filter-control {
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.filter-control:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); }

/* Date input — fix calendar icon visibility in dark mode */
.date-input {
  padding: 0 10px;
  color-scheme: light;
}
[data-theme="dark"] .date-input {
  color-scheme: dark;
}

/* ---- Custom Select / Dropdown ---- */
.custom-select {
  position: relative;
  min-width: 150px;
}

.cs-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  white-space: nowrap;
}
.cs-trigger:hover {
  border-color: var(--accent);
  background: var(--surface);
}
.cs-trigger:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
.custom-select.open .cs-trigger {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.cs-arrow {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}
.custom-select.open .cs-arrow { transform: rotate(180deg); }

.cs-label { flex: 1; overflow: hidden; text-overflow: ellipsis; }

.cs-dropdown {
  position: absolute;
  top: calc(100% + 5px);
  left: 0;
  min-width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  list-style: none;
  padding: 5px;
  z-index: 500;
  /* Hidden by default */
  opacity: 0;
  transform: translateY(-6px) scale(0.98);
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
  transform-origin: top center;
}
.custom-select.open .cs-dropdown {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.cs-option {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
}
.cs-option:hover {
  background: var(--accent-light);
  color: var(--accent);
}
.cs-option.selected {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}
.cs-option.selected::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}
.cs-option:not(.selected)::before {
  content: '';
  width: 6px;
  height: 6px;
  flex-shrink: 0;
}

.custom-range { flex-direction: row; align-items: flex-end; gap: 8px; }
.custom-range .filter-label { align-self: flex-end; margin-bottom: 9px; }

.btn-apply {
  height: 38px;
  padding: 0 22px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
  box-shadow: 0 2px 8px rgba(79,70,229,0.25);
  align-self: flex-end;
}
.btn-apply:hover { background: #4338ca; box-shadow: 0 4px 14px rgba(79,70,229,0.35); }
.btn-apply:active { transform: scale(0.97); }

/* ============================================================
   SUMMARY CARDS
   ============================================================ */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s, transform 0.2s;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.metric-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 20px;
}

.metric-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.metric-icon svg { width: 22px; height: 22px; }

.uptime-icon   { background: var(--icon-uptime);    color: var(--icon-uptime-fg); }
.downtime-icon { background: var(--icon-downtime);  color: var(--icon-downtime-fg); }
.incidents-icon{ background: var(--icon-incidents); color: var(--icon-incidents-fg); }
.response-icon { background: var(--icon-response);  color: var(--icon-response-fg); }

.metric-body { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.metric-label { font-size: 0.72rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.06em; }
.metric-value { font-size: 1.65rem; font-weight: 800; color: var(--text-primary); letter-spacing: -0.03em; line-height: 1.1; }
.metric-sub   { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }

/* ============================================================
   CHARTS SECTION
   ============================================================ */
.charts-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

.chart-card { padding: 22px 24px; }

.chart-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 18px;
  gap: 12px;
  flex-wrap: wrap;
}
.chart-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); }
.chart-desc  { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }

.chart-legend {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}
.legend-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.legend-dot.up   { background: var(--up); }
.legend-dot.down { background: var(--down); }

.legend-line {
  display: inline-block;
  width: 22px; height: 3px;
  border-radius: 2px;
}
.legend-line.response { background: #ff2d6b; }
.legend-line.baseline { background: #555; border-top: 2px dashed #888; height: 0; }

/* ---- Uptime Bar ---- */
.uptime-bar-container {
  display: grid;
  /* columns set dynamically by JS via style attribute */
  grid-auto-columns: 1fr;
  grid-auto-flow: column;
  gap: 3px;
  height: 44px;
  width: 100%;
}

.uptime-segment {
  flex: 1;
  border-radius: 3px;
  cursor: pointer;
  position: relative;
  transition: transform 0.12s ease, filter 0.12s ease;
  min-width: 2px;
}

/* Up segment — green gradient */
.uptime-segment.up {
  background: linear-gradient(180deg, #34d399 0%, #22c55e 100%);
}

/* Down segment — red gradient, slightly more prominent */
.uptime-segment.down {
  background: linear-gradient(180deg, #f87171 0%, #ef4444 100%);
}

/* Hover effect — lift and brighten */
.uptime-segment:hover {
  transform: scaleY(1.12);
  filter: brightness(1.15);
  z-index: 5;
}

.uptime-bar-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.uptime-bar-status {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: 6px;
  text-align: right;
}
.uptime-bar-status .utt-ok   { color: var(--up-dark); font-weight: 700; }
.uptime-bar-status .utt-down { color: var(--down); font-weight: 700; }
[data-theme="dark"] .uptime-bar-status .utt-ok   { color: #34d399; }
[data-theme="dark"] .uptime-bar-status .utt-down { color: #f87171; }

/* ---- Floating Uptime Tooltip ---- */
.uptime-tooltip {
  position: fixed;
  z-index: 9000;
  pointer-events: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  min-width: 160px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.12s ease, transform 0.12s ease;
}
.uptime-tooltip.visible {
  opacity: 1;
  transform: scale(1);
}

.utt-time {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 5px;
  font-variant-numeric: tabular-nums;
}
.utt-status {
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.utt-status.up   { color: #34d399; }
.utt-status.down { color: #f87171; }

.utt-servers {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 4px;
}
.utt-server-tag {
  font-size: 0.7rem;
  font-weight: 600;
  background: rgba(239,68,68,0.15);
  color: #f87171;
  border: 1px solid rgba(239,68,68,0.3);
  border-radius: 4px;
  padding: 2px 7px;
  white-space: nowrap;
}

/* ---- Response Time Chart ---- */
/* Light mode: transparent bg — chart sits on the card surface */
:root { --chart-bg: transparent; }
[data-theme="dark"] { --chart-bg: #0c0e16; }

.dark-chart {
  background: var(--chart-bg);
  border-radius: var(--radius);
  padding: 16px;
  position: relative;
  transition: background 0.3s ease;
}
/* Light mode: add a subtle inset border so the chart area is defined */
.dark-chart::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.3s;
}
[data-theme="dark"] .dark-chart::before { opacity: 0; }
.chart-wrapper { position: relative; height: 200px; }
.dark-chart canvas { border-radius: var(--radius-sm); }

/* ============================================================
   INCIDENTS TABLE
   ============================================================ */
.incidents-section { padding: 22px 24px; }

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.section-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); }

.incident-count-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 12px;
  border-radius: 99px;
  background: var(--accent-light);
  color: var(--accent);
}

.table-wrapper { overflow-x: auto; border-radius: var(--radius-sm); border: 1px solid var(--border); }

.incidents-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.incidents-table th {
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 11px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.incidents-table td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: middle;
}
.incidents-table tbody tr:last-child td { border-bottom: none; }
.incidents-table tbody tr {
  transition: background 0.15s;
}
.incidents-table tbody tr:hover { background: var(--bg); }

/* Status badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 99px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; }
.badge.up      { background: var(--up-bg);   color: var(--up-dark); }
.badge.up::before { background: var(--up-dark); }
.badge.down    { background: var(--down-bg); color: var(--down-dark); }
.badge.down::before { background: var(--down-dark); }
.badge.ongoing { background: var(--warn-bg); color: #92400e; }
.badge.ongoing::before { background: var(--warn); animation: pulse-badge 1.2s infinite; }

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 48px 24px;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.empty-state svg { width: 48px; height: 48px; opacity: 0.35; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 16px 24px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1100px) {
  .summary-grid { grid-template-columns: repeat(2, 1fr); }
  .charts-section { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .summary-grid { grid-template-columns: 1fr 1fr; }
  .filter-bar { flex-direction: column; align-items: stretch; }
  .filter-control { min-width: unset; width: 100%; }
  .btn-apply { width: 100%; }
  .header-inner { flex-wrap: wrap; }
  .metric-value { font-size: 1.35rem; }
}

@media (max-width: 480px) {
  .summary-grid { grid-template-columns: 1fr; }
  .main { padding: 16px 12px; }
  .container { padding: 0 12px; }
}