body {
    margin: 0;
    font-family: "Segoe UI", sans-serif;
    background: linear-gradient(135deg, #0f172a, #020617);
    color: #fff;
}

/* Loader */
#loader {
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #334155;
    border-top: 4px solid #3b82f6;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* App */
.container {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hidden {
    display: none;
}

.card {
    background: #1e293b;
    padding: 40px;
    border-radius: 12px;
    width: 320px;
    box-shadow: 0 0 40px rgba(0,0,0,0.6);
    text-align: center;
}

.logo {
    width: 60px;
    margin-bottom: 10px;
}

input {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    border-radius: 6px;
    border: none;
    background: #334155;
    color: white;
}

button {
    width: 100%;
    padding: 12px;
    background: #3b82f6;
    border: none;
    border-radius: 6px;
    color: white;
    font-weight: bold;
    cursor: pointer;
}

button:hover {
    background: #2563eb;
}

.hint {
    font-size: 12px;
    color: #94a3b8;
    margin-top: 10px;
}