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

:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-hover: #243044;
  --accent: #00d4aa;
  --accent-dim: #00a885;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --success: #3fb950;
  --danger: #f85149;
}

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

body {
  font-family: 'Manrope', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.app {
  max-width: 420px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
  padding-bottom: max(1.5rem, env(safe-area-inset-bottom));
}

.header {
  text-align: center;
  margin-bottom: 1.75rem;
}

.header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent) 0%, #7ee8fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  margin-top: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.amount-display {
  text-align: center;
  margin-bottom: 1rem;
}

.amount-current {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent);
}

.amount-suffix {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.5rem;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

.progress-bar-wrap {
  margin-bottom: 2rem;
}

.progress-bar {
  width: 100%;
  height: 20px;
  background: var(--surface);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #7ee8fa);
  border-radius: 10px;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0%;
}

.progress-labels {
  display: flex;
  justify-content: space-between;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.current-step {
  background: var(--surface);
  border-radius: 14px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(0, 212, 170, 0.15);
}

.step-amount {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.step-amount strong {
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
}

.btn {
  font-family: 'Manrope', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  padding: 0.875rem 2rem;
  width: 100%;
  min-height: 48px;
}

.btn-primary:hover {
  background: var(--accent-dim);
  transform: translateY(-1px);
}

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

.btn-secondary {
  background: transparent;
  color: var(--text-muted);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-secondary:hover {
  color: var(--danger);
}

/* Touch-friendly on mobile */
@media (max-width: 480px) {
  .header h1 {
    font-size: 1.5rem;
  }

  .amount-current {
    font-size: 1.75rem;
  }
}