/* ═══════════════════════════════════════════════════════════════
   PiLambdaChart Dashboard — Dark Slate Design System v2
   ═══════════════════════════════════════════════════════════════ */

/* ── Design Tokens ─────────────────────────────────────────────── */
:root {
  --bg-base:        hsl(222, 24%, 8%);
  --bg-surface:     hsl(222, 20%, 11%);
  --bg-elevated:    hsl(222, 18%, 14%);
  --bg-glass:       hsla(222, 20%, 15%, 0.7);
  --bg-tile:        hsl(222, 18%, 13%);

  --border-subtle:  hsl(222, 16%, 20%);
  --border-muted:   hsl(222, 14%, 26%);

  --text-primary:   hsl(210, 40%, 96%);
  --text-secondary: hsl(215, 20%, 65%);
  --text-muted:     hsl(215, 14%, 42%);

  --accent:         hsl(174, 88%, 48%);
  --accent-dim:     hsl(174, 55%, 32%);
  --accent-glow:    hsla(174, 88%, 48%, 0.15);

  --success:        hsl(145, 58%, 48%);

  --sidebar-width:      252px;
  --sidebar-collapsed:  60px;
  --topbar-height:      52px;

  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;

  --ease-smooth:  cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast:     140ms;
  --dur-mid:      260ms;
  --dur-slow:     380ms;
}

/* ── Reset ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Outfit', system-ui, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  display: flex;
  min-height: 100vh;
  overflow-x: hidden;
}

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-muted); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-dim); }

/* ════════════════════════════════════════════════════════════════
   SIDEBAR
════════════════════════════════════════════════════════════════ */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow: hidden;
  transition: width var(--dur-slow) var(--ease-smooth);
}

.sidebar.collapsed { width: var(--sidebar-collapsed); }

/* Header */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 14px;
  border-bottom: 1px solid var(--border-subtle);
  min-height: 56px;
  flex-shrink: 0;
}

.logo { display: flex; align-items: center; gap: 9px; overflow: hidden; white-space: nowrap; }
.logo-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  filter: drop-shadow(0 0 6px var(--accent));
}
.logo-text {
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: opacity var(--dur-mid);
}
.sidebar.collapsed .logo-text { opacity: 0; pointer-events: none; }

.sidebar-toggle {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 0.7rem;
  flex-shrink: 0;
  transition: background var(--dur-fast), color var(--dur-fast),
              transform var(--dur-slow) var(--ease-smooth);
}
.sidebar-toggle:hover { background: var(--accent-glow); color: var(--accent); }
.sidebar.collapsed .sidebar-toggle { transform: rotate(180deg); }

/* Section labels */
.sidebar-section-label {
  padding: 14px 14px 6px;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  flex-shrink: 0;
  transition: opacity var(--dur-mid);
}
.sidebar.collapsed .sidebar-section-label { opacity: 0; }

/* Loading placeholder */
.sidebar-loading {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* Device list */
.device-list {
  padding: 2px 8px 8px;
  flex-shrink: 0;
}

.device-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.86rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  transition: background var(--dur-fast), color var(--dur-fast);
}
.device-btn:hover { background: var(--bg-elevated); color: var(--text-primary); }
.device-btn.active {
  background: var(--accent-glow);
  color: var(--accent);
  font-weight: 600;
}

.device-btn-icon { font-size: 0.95rem; flex-shrink: 0; }
.device-btn-label { overflow: hidden; text-overflow: ellipsis; transition: opacity var(--dur-mid); }
.sidebar.collapsed .device-btn-label { opacity: 0; pointer-events: none; }

/* Month list */
.month-list {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 2px 8px 8px;
}

.month-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.83rem;
  font-weight: 400;
  cursor: pointer;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  transition: background var(--dur-fast), color var(--dur-fast);
}
.month-btn:hover { background: var(--bg-elevated); color: var(--text-primary); }
.month-btn.active {
  background: var(--accent-glow);
  color: var(--accent);
  font-weight: 600;
}

.month-btn-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--border-muted);
  flex-shrink: 0;
  transition: background var(--dur-fast);
}
.month-btn.active .month-btn-dot { background: var(--accent); box-shadow: 0 0 5px var(--accent); }
.month-btn-label { overflow: hidden; text-overflow: ellipsis; transition: opacity var(--dur-mid); }
.sidebar.collapsed .month-btn-label { opacity: 0; pointer-events: none; }

/* Footer */
.sidebar-footer {
  padding: 10px 14px;
  border-top: 1px solid var(--border-subtle);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  overflow: hidden;
}
.badge-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 5px var(--success);
  flex-shrink: 0;
}
.sidebar-footer-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  transition: opacity var(--dur-mid);
}
.sidebar.collapsed .sidebar-footer-text { opacity: 0; }

/* ════════════════════════════════════════════════════════════════
   MAIN WRAPPER
════════════════════════════════════════════════════════════════ */
.main-wrapper {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-left var(--dur-slow) var(--ease-smooth);
}
body.sidebar-collapsed .main-wrapper { margin-left: var(--sidebar-collapsed); }

/* ── Topbar ─────────────────────────────────────────────────────── */
.topbar {
  height: var(--topbar-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.topbar-left { display: flex; align-items: center; gap: 12px; }

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 4px;
}

/* Small page title — just an identity label in the topbar */
.page-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.topbar-right { display: flex; align-items: center; }

.month-badge {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 4px 10px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
}

/* ════════════════════════════════════════════════════════════════
   MAIN CONTENT
════════════════════════════════════════════════════════════════ */
.content {
  flex: 1;
  padding: 24px 24px 48px;
  display: flex;
  flex-direction: column;
}

/* Main loading state */
.main-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 60px 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

/* Month view: stack of day cards */
.month-view {
  display: flex;
  flex-direction: column;
  gap: 40px;
  flex: 1;
}

/* ── Day card ───────────────────────────────────────────────────── */
.day-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 12px;
  animation: fadeIn var(--dur-slow) var(--ease-smooth);
}

.day-header {
  position: sticky;
  top: var(--topbar-height);
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  margin: 0 -16px;
  background: hsla(222, 24%, 8%, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
}

.day-date {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.015em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.day-tag {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--accent-glow);
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  box-shadow: 0 0 12px var(--accent-glow);
}

.day-divider {
  height: 1px;
  background: linear-gradient(90deg, var(--border-muted), transparent);
  flex: 1;
}

/* ── Chart tiles grid ───────────────────────────────────────────── */
/* --tile-cols is set dynamically by JS: 1 for single metric, 2 for multi */
.chart-tiles {
  display: grid;
  grid-template-columns: repeat(var(--tile-cols, 2), 1fr);
  gap: 12px;
}

.chart-tile {
  background: var(--bg-tile);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: zoom-in;
  transition: border-color var(--dur-fast), transform var(--dur-fast), box-shadow var(--dur-fast);
}
.chart-tile:hover {
  border-color: var(--accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

/* ════════════════════════════════════════════════════════════════
   CHART ENLARGE LIGHTBOX MODAL
════════════════════════════════════════════════════════════════ */
.chart-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: hsla(222, 24%, 4%, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-mid) var(--ease-smooth);
  cursor: zoom-out;
}

.chart-modal.active {
  opacity: 1;
  pointer-events: all;
}

.chart-modal-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 96vw;
  max-height: 95vh;
  gap: 10px;
}

.chart-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0 4px;
}

.chart-modal-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.chart-modal-close {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background var(--dur-fast), color var(--dur-fast);
}

.chart-modal-close:hover {
  background: var(--accent-glow);
  color: var(--accent);
}

.chart-modal-img {
  max-width: 95vw;
  max-height: 84vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-muted);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
  cursor: zoom-out;
  transition: transform var(--dur-mid) var(--ease-smooth);
}

.chart-modal-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.tile-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 12px 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.tile-metric-name {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.tile-img-wrapper {
  position: relative;
  width: 100%;
  background: var(--bg-base);
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* ════════════════════════════════════════════════════════════════
   CROSSHAIR & TOOLTIP SYSTEM
════════════════════════════════════════════════════════════════ */
.crosshair-line {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1.5px;
  background: rgba(56, 189, 248, 0.85);
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
  pointer-events: none;
  z-index: 10;
  opacity: 0;
  transition: opacity var(--dur-fast);
}

.crosshair-line.active {
  opacity: 1;
}

.crosshair-dot {
  position: absolute;
  width: 10px;
  height: 10px;
  margin-left: -5px;
  margin-top: -5px;
  border-radius: 50%;
  background: #38bdf8;
  border: 2px solid #0f172a;
  box-shadow: 0 0 10px #38bdf8;
  pointer-events: none;
  z-index: 11;
  opacity: 0;
  transition: opacity var(--dur-fast);
}

.crosshair-dot.active {
  opacity: 1;
}

.chart-tooltip {
  position: absolute;
  z-index: 20;
  pointer-events: none;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  color: var(--text-primary);
  font-size: 0.78rem;
  font-weight: 500;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6);
  opacity: 0;
  transition: opacity var(--dur-fast);
  transform: translate(-50%, -125%);
}

.chart-tooltip.active {
  opacity: 1;
}

.chart-tooltip .tt-time {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.chart-tooltip .tt-val {
  font-weight: 600;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 4px;
}

.modal-img-wrapper {
  position: relative;
  display: inline-block;
  max-width: 95vw;
  max-height: 84vh;
  overflow: hidden;
}

.tile-img {
  width: 100%;
  height: auto;
  display: block;
  transition: opacity var(--dur-mid);
}

.tile-img.loading { opacity: 0; }

.tile-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.tile-error {
  padding: 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* ── Content footer (hint) ──────────────────────────────────────── */
.content-footer {
  margin-top: auto;
  padding-top: 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-sub {
  font-size: 0.76rem;
  color: hsl(215, 14%, 34%);
}

/* ════════════════════════════════════════════════════════════════
   SPINNERS
════════════════════════════════════════════════════════════════ */
.spinner {
  width: 18px; height: 18px;
  border: 2px solid var(--border-subtle);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}
.spinner-lg { width: 32px; height: 32px; border-width: 3px; }
.spinner-sm { width: 14px; height: 14px; }

/* ════════════════════════════════════════════════════════════════
   MOBILE OVERLAY
════════════════════════════════════════════════════════════════ */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: hsla(222, 24%, 4%, 0.7);
  z-index: 99;
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-mid);
}
.sidebar-overlay.visible { opacity: 1; pointer-events: all; }

/* ════════════════════════════════════════════════════════════════
   UTILITY
════════════════════════════════════════════════════════════════ */
.hidden { display: none !important; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ════════════════════════════════════════════════════════════════
   RESPONSIVE
════════════════════════════════════════════════════════════════ */
@media (max-width: 860px) {
  .sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-width) !important;
    transition: transform var(--dur-slow) var(--ease-smooth);
    z-index: 200;
  }
  .sidebar.mobile-open { transform: translateX(0); }
  .sidebar-overlay { display: block; }
  .main-wrapper { margin-left: 0 !important; }
  .mobile-toggle { display: flex; }
  .sidebar-toggle { display: none; }
  .content { padding: 14px 14px 40px; }
  .chart-tiles { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 540px) {
  .chart-tiles { grid-template-columns: 1fr !important; }
}

/* ════════════════════════════════════════════════════════════════
   DEMO NOTICE BANNER (OPTIONAL)
════════════════════════════════════════════════════════════════ */
.demo-notice-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(14, 165, 233, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: #e0f2fe;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 0.84rem;
  font-weight: 400;
  line-height: 1.4;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  animation: fadeIn var(--dur-normal) var(--ease-smooth);
}

.demo-banner-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.demo-banner-text {
  flex: 1;
}