@import url('https://fonts.googleapis.com/css2?family=Rajdhani:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  --bg-deep: #0a0c10;
  --bg-primary: #0d1117;
  --bg-surface: #151b23;
  --bg-elevated: #1c2333;
  --bg-hover: #222d3d;
  --border-subtle: rgba(74, 158, 255, 0.1);
  --border-accent: rgba(255, 106, 0, 0.3);
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #565e68;
  --accent-orange: #ff6a00;
  --accent-orange-dim: rgba(255, 106, 0, 0.15);
  --accent-blue: #4a9eff;
  --accent-blue-dim: rgba(74, 158, 255, 0.1);
  --glow-orange: 0 0 20px rgba(255, 106, 0, 0.2);
  --font-display: 'Rajdhani', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --radius: 2px;
  --transition: 180ms ease;
}

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

html { font-size: 16px; }

body {
  background-color: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,0.03) 2px, rgba(0,0,0,0.03) 4px);
}

body::after {
  content: '';
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(255,106,0,0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* === Layout === */
.page-shell {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* === Nav === */
.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.site-nav a {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.3rem 0;
  position: relative;
  transition: color var(--transition);
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--accent-orange);
  transition: width var(--transition);
}

.site-nav a:hover { color: var(--text-primary); }
.site-nav a:hover::after { width: 100%; }
.site-nav a.active { color: var(--accent-orange); }
.site-nav a.active::after { width: 100%; }

/* === Header === */
.page-header { margin-bottom: 1.25rem; }

.page-header h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2.2rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1.1;
}

.page-header h1 .accent { color: var(--accent-orange); }

/* === Toolbar === */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.65rem 0.9rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
}

.toolbar-section {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.toolbar-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Preset buttons */
.preset-group {
  display: flex;
  gap: 2px;
}

.preset {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  padding: 0.3rem 0.65rem;
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

.preset:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--accent-orange);
}

.preset.active {
  background: var(--accent-orange-dim);
  color: var(--accent-orange);
  border-color: var(--border-accent);
}

/* Custom range */
.custom-range {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: 0.5rem;
  padding-left: 0.75rem;
  border-left: 1px solid var(--border-subtle);
}

.range-sep {
  color: var(--text-muted);
  font-size: 0.75rem;
}

input[type="datetime-local"] {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 0.3rem 0.5rem;
  transition: border-color var(--transition);
  width: 11rem;
}

input[type="datetime-local"]:focus {
  outline: none;
  border-color: var(--accent-orange);
}

input[type="datetime-local"]::-webkit-calendar-picker-indicator {
  filter: invert(0.7);
}

.toolbar-btn {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.3rem 0.6rem;
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

.toolbar-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--accent-orange);
}

/* Slider */
input[type="range"] {
  width: 80px;
  accent-color: var(--accent-orange);
  height: 4px;
  vertical-align: middle;
}

.slider-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent-orange);
  min-width: 1.5rem;
  text-align: center;
}

/* === Server bar === */
.server-bar {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.server-chips {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  min-height: 2rem;
  align-items: center;
}

.chips-loading {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  user-select: none;
}

.chip:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.chip.selected {
  background: var(--accent-orange-dim);
  color: var(--accent-orange);
  border-color: var(--border-accent);
}

.chip .chip-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.chip.selected .chip-dot {
  box-shadow: 0 0 4px currentColor;
}

.server-search-wrap {
  flex-shrink: 0;
}

.server-search-wrap input[type="text"] {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 0.35rem 0.6rem;
  width: 160px;
  transition: border-color var(--transition);
}

.server-search-wrap input[type="text"]:focus {
  outline: none;
  border-color: var(--accent-orange);
}

.server-search-wrap input[type="text"]::placeholder {
  color: var(--text-muted);
}

/* === Chart === */
.chart-wrap {
  flex: 1;
  min-height: 300px;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1rem;
  position: relative;
}

#historyChart {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

/* Loading overlay */
.chart-loading {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: rgba(10, 12, 16, 0.8);
  z-index: 10;
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.chart-loading.visible {
  display: flex;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-subtle);
  border-top-color: var(--accent-orange);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* === Responsive === */
@media (max-width: 900px) {
  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar-section {
    justify-content: flex-start;
  }

  .custom-range {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    margin-top: 0.5rem;
    flex-wrap: wrap;
  }
}

@media (max-width: 768px) {
  .page-shell { padding: 1.5rem 1rem 2rem; }
  .page-header h1 { font-size: 1.7rem; }
  .site-nav { gap: 1rem; flex-wrap: wrap; }

  input[type="datetime-local"] { width: 9rem; font-size: 0.7rem; }

  .chip { font-size: 0.68rem; padding: 0.15rem 0.4rem; }
  .server-search-wrap input[type="text"] { width: 120px; }
}

@media (max-width: 480px) {
  .page-header h1 { font-size: 1.4rem; }
  .preset { padding: 0.25rem 0.5rem; font-size: 0.72rem; }
}