:root {
  --bg: #0a0e17;
  --surface: #131a2a;
  --accent: #2563eb;
  --accent-glow: rgba(37, 99, 235, 0.4);
  --text: #f0f4f8;
  --sub: #8b95a5;
  --radius: 24px;
  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.surface {
  background: var(--surface);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 5vw, 2.5rem);
  width: min(90vw, 380px);
  display: flex;
  flex-direction: column;
  gap: 2rem;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.05);
  animation: fadeUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

header { text-align: center; }

h1 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--sub);
}

.meta {
  display: block;
  font-size: 0.75rem;
  color: var(--sub);
  opacity: 0.7;
  margin-top: 0.25rem;
}

.counter-area { text-align: center; }

.display {
  font-size: clamp(3.5rem, 15vw, 5rem);
  font-weight: 800;
  line-height: 1;
  color: var(--text);
  transition: transform 0.15s cubic-bezier(0.34, 1.56, 0.64, 1), color 0.2s;
}

.display.pop {
  transform: scale(1.2);
  color: var(--accent-glow);
}

.btn {
  position: relative;
  width: 100%;
  padding: 1.25rem;
  border: none;
  border-radius: 16px;
  background: var(--accent);
  color: #fff;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 8px 24px var(--accent-glow);
  transition: transform 0.1s ease, box-shadow 0.2s ease, background 0.2s;
  overflow: hidden;
}

.btn:hover {
  box-shadow: 0 12px 32px var(--accent-glow);
  filter: brightness(1.15);
}

.btn:active {
  transform: scale(0.96) translateY(2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.btn-icon {
  font-size: 1.2rem;
  line-height: 1;
  opacity: 0.9;
}

footer { text-align: center; }

.status {
  font-size: 0.75rem;
  color: var(--sub);
  opacity: 0.6;
}

.pause-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transition: opacity 0.3s ease;
}

.toast {
  background: rgba(255,255,255,0.1);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  pointer-events: none;
  animation: pulse 2s infinite ease-in-out;
}

.hidden { opacity: 0; pointer-events: none; }

@keyframes pulse {
  0%, 100% { opacity: 0.8; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
}