body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f4f7f9; display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; }
.container { max-width: 550px; width: 90%; text-align: center; }
.card { background: white; padding: 2rem; border-radius: 12px; box-shadow: 0 4px 20px rgba(0,0,0,0.08); }
.form-group { text-align: right; margin-bottom: 1.5rem; }
label { display: block; font-weight: 600; margin-bottom: 0.5rem; color: #333; }
input, select { width: 100%; padding: 12px; border: 1px solid #ddd; border-radius: 6px; box-sizing: border-box; font-size: 1rem; }
button { width: 100%; padding: 12px; background: #0078d4; color: white; border: none; border-radius: 6px; font-size: 1rem; font-weight: bold; cursor: pointer; transition: background 0.3s; }
button:hover { background: #005a9e; }
.result-box { margin-top: 1.5rem; padding: 1rem; border-radius: 6px; font-weight: bold; }
.success { background-color: #dff6dd; color: #107c10; border: 1px solid #107c10; }
.error { background-color: #fde7e9; color: #a4262c; border: 1px solid #a4262c; }
.hidden { display: none; }
.limit-note { font-size: 0.8rem; color: #666; margin-top: 1rem; }