* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { background-color: #f4f7f6; display: flex; justify-content: center; align-items: center; height: 100vh; }
.container { background: white; padding: 30px; border-radius: 10px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); width: 100%; max-width: 400px; text-align: center; }
h1 { margin-bottom: 20px; color: #333; font-size: 24px; }
.input-group { margin-bottom: 15px; }
input { width: 100%; padding: 12px; border: 1px solid #ddd; border-radius: 5px; outline: none; font-size: 14px; }
input:focus { border-color: #007bff; }
button { width: 100%; padding: 12px; background: #007bff; color: white; border: none; border-radius: 5px; cursor: pointer; font-size: 16px; transition: 0.3s; }
button:hover { background: #0056b3; }
.hidden { display: none; }
#result-box { margin-top: 20px; padding: 15px; background: #e8f5e9; border: 1px solid #c8e6c9; border-radius: 5px; }
#short-link { display: block; margin: 10px 0; color: #2e7d32; font-weight: bold; text-decoration: none; word-break: break-all; }
#copy-btn { background: #2e7d32; padding: 8px; font-size: 14px; }
#copy-btn:hover { background: #1b5e20; }
#error-box { margin-top: 20px; color: #d32f2f; font-size: 14px; }