:root {
  --bg: #0a0b0e;
  --bg-card: #12141a;
  --accent: #00d4aa;
  --accent-dim: #00a88a;
  --text: #e8eaed;
  --text-muted: #8b949e;
  --border: #21262d;
  --radius: 12px;
  --font-sans: 'Outfit', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 212, 170, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(0, 212, 170, 0.08), transparent);
}

.app {
  width: 100%;
  max-width: 480px;
  padding: 2rem;
}

.header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.logo {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 300;
}

.main {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
}

.gauges {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.gauge {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 8px;
  padding: 1rem 1.25rem;
}

.gauge-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.gauge-value {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--accent);
  transition: transform 0.15s ease;
}

.gauge-value.updating {
  transform: scale(1.02);
}

.gauge-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.gauge-volume {
  font-size: 0.7rem;
  color: var(--text-muted);
  opacity: 0.8;
  margin-bottom: 0.5rem;
  min-height: 1rem;
}

.gauge-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.gauge-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent));
  border-radius: 2px;
  width: 0%;
  transition: width 0.2s ease-out;
  box-shadow: 0 0 12px rgba(0, 212, 170, 0.3);
}

.status-wrap {
  text-align: center;
  margin-bottom: 1.5rem;
  min-height: 4rem;
}

.status {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.countdown {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.countdown::before {
  content: '';
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  margin-right: 0.35rem;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 1s ease-in-out infinite;
  vertical-align: middle;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.btn-start {
  width: 100%;
  padding: 1rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--bg);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.btn-start:hover {
  transform: translateY(-1px);
  opacity: 0.95;
}

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

.btn-start:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-icon {
  font-size: 0.75rem;
}

.meta {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1.5rem 2rem;
}

.btn-refresh {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 2rem;
  height: 2rem;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, border-color 0.15s;
}

.btn-refresh:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.meta-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.meta-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.meta-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

#ip-value {
  word-break: break-all;
}

.footer {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}