* { box-sizing: border-box; font-family: 'Segoe UI', sans-serif; }
body { margin: 0; background: #eef2f5; color: #333; }
.screen { display: none; }
.screen.active { display: block; }
.card { background: white; padding: 25px; border-radius: 8px; box-shadow: 0 4px 10px rgba(0,0,0,0.1); max-width: 450px; margin: 40px auto; }
h1, h2, h3 { color: #2c3e50; margin-top: 0; }
input { width: 100%; padding: 12px; margin: 10px 0; border: 1px solid #ddd; border-radius: 5px; }
.btn { padding: 12px 20px; border: none; border-radius: 5px; cursor: pointer; font-weight: bold; width: 100%; }
.btn.primary { background: #3498db; color: white; }
.btn.secondary { background: #2ecc71; color: white; }
.btn.small { width: auto; padding: 6px 12px; font-size: 0.9em; background: #e74c3c; color: white;}
header { background: #fff; padding: 15px 30px; display: flex; justify-content: space-between; align-items: center; box-shadow: 0 2px 4px rgba(0,0,0,0.05); }
.content { padding: 20px; max-width: 1000px; margin: 0 auto; }
table { width: 100%; border-collapse: collapse; margin-top: 15px; background: white; }
th, td { padding: 12px; text-align: left; border-bottom: 1px solid #ddd; }
th { background: #f8f9fa; }