/* ─────────────────────────────────────────────────────────────────────────────
   Smart Grid Telemetry — JitterRetryClient Demo
   Dark glassmorphism theme with electric accent colors
───────────────────────────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
  --bg-void:      #060b14;
  --bg-deep:      #0b1320;
  --bg-card:      rgba(15, 25, 45, 0.85);
  --bg-glass:     rgba(255, 255, 255, 0.04);
  --border:       rgba(0, 200, 255, 0.12);
  --border-glow:  rgba(0, 200, 255, 0.4);

  --accent:       #00c8ff;
  --accent-dim:   rgba(0, 200, 255, 0.15);
  --success:      #00e5a0;
  --warning:      #ffb800;
  --danger:       #ff4560;

  --text-primary:   #e8f4ff;
  --text-secondary: #7a9bbf;
  --text-muted:     #3a5070;

  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  --glow: 0 0 24px rgba(0, 200, 255, 0.2);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-void);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Animated grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,200,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,200,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: 0;
  pointer-events: none;
}

/* ── Layout ──────────────────────────────────────────────────────────────── */
.container {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ── Header ──────────────────────────────────────────────────────────────── */
.header {
  text-align: center;
  margin-bottom: 3rem;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.header h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  background: linear-gradient(135deg, #e8f4ff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}

.header p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ── Stats bar ───────────────────────────────────────────────────────────── */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  backdrop-filter: blur(12px);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.stat-card:hover { border-color: var(--border-glow); box-shadow: var(--glow); }

.stat-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.stat-value.success { color: var(--success); }
.stat-value.warning { color: var(--warning); }
.stat-value.danger  { color: var(--danger); }

/* ── Card ─────────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-glass);
}

.card-title {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-body { padding: 1.5rem; }

/* ── Controls ─────────────────────────────────────────────────────────────── */
.controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr) auto;
  gap: 1rem;
  align-items: end;
}

.field { display: flex; flex-direction: column; gap: 0.4rem; }

.field label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.field input, .field select {
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 0.55rem 0.75rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
}

.field input:focus, .field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,200,255,0.12);
}

.field select option { background: #0b1320; }

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #0099cc, var(--accent));
  color: #000;
  box-shadow: 0 4px 16px rgba(0,200,255,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,200,255,0.45);
}

.btn-primary:active { transform: translateY(0); }

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-ghost {
  background: var(--bg-glass);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.btn-ghost:hover {
  border-color: var(--border-glow);
  color: var(--text-primary);
}

/* ── Status indicator ─────────────────────────────────────────────────────── */
.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background 0.3s;
}

.status-dot.running  { background: var(--warning); animation: pulse 1s infinite; }
.status-dot.success  { background: var(--success); }
.status-dot.failed   { background: var(--danger); }

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(1.3); }
}

/* ── Telemetry table ──────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

thead th {
  padding: 0.6rem 1rem;
  text-align: left;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid rgba(255,255,255,0.04);
  animation: rowIn 0.3s ease both;
}

@keyframes rowIn {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0); }
}

tbody tr:last-child { border-bottom: none; }

tbody td {
  padding: 0.65rem 1rem;
  color: var(--text-primary);
  vertical-align: middle;
}

.col-attempt {
  font-weight: 700;
  color: var(--accent);
}

.col-exp   { color: #c0d8f0; }
.col-jitter-pos { color: var(--success); }
.col-jitter-neg { color: var(--danger); }
.col-actual { font-weight: 600; color: var(--warning); }
.col-reason { color: var(--text-secondary); font-size: 0.75rem; }

.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 600;
}

.badge-retry   { background: rgba(255,184,0,0.15); color: var(--warning); }
.badge-success { background: rgba(0,229,160,0.15); color: var(--success); }
.badge-failed  { background: rgba(255,69,96,0.15);  color: var(--danger); }

/* ── Empty state ──────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}

.empty-state .icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.empty-state p { font-size: 0.9rem; }

/* ── Algo explainer ───────────────────────────────────────────────────────── */
.formula-box {
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 2;
}

.formula-box .hl { color: var(--accent); font-weight: 600; }
.formula-box .hl-g { color: var(--success); font-weight: 600; }

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 680px) {
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .controls  { grid-template-columns: 1fr 1fr; }
  .controls .btn { grid-column: 1 / -1; }
}