* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang HK", sans-serif; background: #e8f5e9; color: #222; padding: 10px; max-width: 420px; margin: 0 auto; text-align: center; }
header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
h1 { font-size: 1.6rem; }
.big-btn { background: #4caf50; color: white; border: none; border-radius: 12px; padding: 14px 22px; font-size: 1.2rem; min-height: 50px; cursor: pointer; }
#chart { display: flex; align-items: flex-end; justify-content: center; gap: 20px; height: 200px; background: white; border-radius: 16px; padding: 20px; margin: 20px 0; }
.bar { width: 60px; background: #81c784; border-radius: 8px 8px 0 0; display: flex; align-items: flex-end; justify-content: center; color: white; font-weight: bold; }