body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #0f172a, #1e293b);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    width: 100%;
    max-width: 500px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 32px;
}

header p {
    opacity: 0.7;
}

.card {
    background: rgba(255,255,255,0.05);
    padding: 30px;
    border-radius: 16px;
    backdrop-filter: blur(10px);
    margin-top: 20px;
}

input {
    width: 100%;
    padding: 12px;
    border-radius: 10px;
    border: none;
    margin-bottom: 15px;
    font-size: 14px;
}

button {
    width: 100%;
    padding: 12px;
    border-radius: 10px;
    border: none;
    background: #22c55e;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: 0.2s;
}

button:hover {
    background: #16a34a;
}

#loader {
    margin-top: 15px;
    border: 4px solid rgba(255,255,255,0.1);
    border-top: 4px solid #22c55e;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
}

.hidden {
    display: none;
}

@keyframes spin {
    100% { transform: rotate(360deg); }
}

#result {
    margin-top: 15px;
    font-size: 14px;
    opacity: 0.9;
}

footer {
    margin-top: 20px;
    font-size: 12px;
    opacity: 0.6;
}

footer a {
    margin: 0 10px;
    color: white;
    text-decoration: none;
}